git/diff.c
Jakub Narebski d8faea9d18 diff: strip extra "/" when stripping prefix
There are two ways a user might want to use "diff --relative":

  1. For a file in a directory, like "subdir/file", the user
     can use "--relative=subdir/" to strip the directory.

  2. To strip part of a filename, like "foo-10", they can
     use "--relative=foo-".

We currently handle both of those situations. However, if the user passes
"--relative=subdir" (without the trailing slash), we produce inconsistent
results. For the unified diff format, we collapse the double-slash of
"a//file" correctly into "a/file". But for other formats (raw, stat,
name-status), we end up with "/file".

We can do what the user means here and strip the extra "/" (and only a
slash).  We are not hurting any existing users of (2) above with this
behavior change because the existing output for this case was nonsensical.

Patch by Jakub, tests and commit message by Jeff King.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-08-11 09:46:47 -07:00

4291 lines
113 KiB
C

/*
* Copyright (C) 2005 Junio C Hamano
*/
#include "cache.h"
#include "quote.h"
#include "diff.h"
#include "diffcore.h"
#include "delta.h"
#include "xdiff-interface.h"
#include "color.h"
#include "attr.h"
#include "run-command.h"
#include "utf8.h"
#include "userdiff.h"
#include "sigchain.h"
#include "submodule.h"
#include "ll-merge.h"
#ifdef NO_FAST_WORKING_DIRECTORY
#define FAST_WORKING_DIRECTORY 0
#else
#define FAST_WORKING_DIRECTORY 1
#endif
static int diff_detect_rename_default;
static int diff_rename_limit_default = 200;
static int diff_suppress_blank_empty;
int diff_use_color_default = -1;
static const char *diff_word_regex_cfg;
static const char *external_diff_cmd_cfg;
int diff_auto_refresh_index = 1;
static int diff_mnemonic_prefix;
static int diff_no_prefix;
static char diff_colors[][COLOR_MAXLEN] = {
GIT_COLOR_RESET,
GIT_COLOR_NORMAL, /* PLAIN */
GIT_COLOR_BOLD, /* METAINFO */
GIT_COLOR_CYAN, /* FRAGINFO */
GIT_COLOR_RED, /* OLD */
GIT_COLOR_GREEN, /* NEW */
GIT_COLOR_YELLOW, /* COMMIT */
GIT_COLOR_BG_RED, /* WHITESPACE */
GIT_COLOR_NORMAL, /* FUNCINFO */
};
static int parse_diff_color_slot(const char *var, int ofs)
{
if (!strcasecmp(var+ofs, "plain"))
return DIFF_PLAIN;
if (!strcasecmp(var+ofs, "meta"))
return DIFF_METAINFO;
if (!strcasecmp(var+ofs, "frag"))
return DIFF_FRAGINFO;
if (!strcasecmp(var+ofs, "old"))
return DIFF_FILE_OLD;
if (!strcasecmp(var+ofs, "new"))
return DIFF_FILE_NEW;
if (!strcasecmp(var+ofs, "commit"))
return DIFF_COMMIT;
if (!strcasecmp(var+ofs, "whitespace"))
return DIFF_WHITESPACE;
if (!strcasecmp(var+ofs, "func"))
return DIFF_FUNCINFO;
return -1;
}
static int git_config_rename(const char *var, const char *value)
{
if (!value)
return DIFF_DETECT_RENAME;
if (!strcasecmp(value, "copies") || !strcasecmp(value, "copy"))
return DIFF_DETECT_COPY;
return git_config_bool(var,value) ? DIFF_DETECT_RENAME : 0;
}
/*
* These are to give UI layer defaults.
* The core-level commands such as git-diff-files should
* never be affected by the setting of diff.renames
* the user happens to have in the configuration file.
*/
int git_diff_ui_config(const char *var, const char *value, void *cb)
{
if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff")) {
diff_use_color_default = git_config_colorbool(var, value, -1);
return 0;
}
if (!strcmp(var, "diff.renames")) {
diff_detect_rename_default = git_config_rename(var, value);
return 0;
}
if (!strcmp(var, "diff.autorefreshindex")) {
diff_auto_refresh_index = git_config_bool(var, value);
return 0;
}
if (!strcmp(var, "diff.mnemonicprefix")) {
diff_mnemonic_prefix = git_config_bool(var, value);
return 0;
}
if (!strcmp(var, "diff.noprefix")) {
diff_no_prefix = git_config_bool(var, value);
return 0;
}
if (!strcmp(var, "diff.external"))
return git_config_string(&external_diff_cmd_cfg, var, value);
if (!strcmp(var, "diff.wordregex"))
return git_config_string(&diff_word_regex_cfg, var, value);
return git_diff_basic_config(var, value, cb);
}
int git_diff_basic_config(const char *var, const char *value, void *cb)
{
if (!strcmp(var, "diff.renamelimit")) {
diff_rename_limit_default = git_config_int(var, value);
return 0;
}
switch (userdiff_config(var, value)) {
case 0: break;
case -1: return -1;
default: return 0;
}
if (!prefixcmp(var, "diff.color.") || !prefixcmp(var, "color.diff.")) {
int slot = parse_diff_color_slot(var, 11);
if (slot < 0)
return 0;
if (!value)
return config_error_nonbool(var);
color_parse(value, var, diff_colors[slot]);
return 0;
}
/* like GNU diff's --suppress-blank-empty option */
if (!strcmp(var, "diff.suppressblankempty") ||
/* for backwards compatibility */
!strcmp(var, "diff.suppress-blank-empty")) {
diff_suppress_blank_empty = git_config_bool(var, value);
return 0;
}
return git_color_default_config(var, value, cb);
}
static char *quote_two(const char *one, const char *two)
{
int need_one = quote_c_style(one, NULL, NULL, 1);
int need_two = quote_c_style(two, NULL, NULL, 1);
struct strbuf res = STRBUF_INIT;
if (need_one + need_two) {
strbuf_addch(&res, '"');
quote_c_style(one, &res, NULL, 1);
quote_c_style(two, &res, NULL, 1);
strbuf_addch(&res, '"');
} else {
strbuf_addstr(&res, one);
strbuf_addstr(&res, two);
}
return strbuf_detach(&res, NULL);
}
static const char *external_diff(void)
{
static const char *external_diff_cmd = NULL;
static int done_preparing = 0;
if (done_preparing)
return external_diff_cmd;
external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
if (!external_diff_cmd)
external_diff_cmd = external_diff_cmd_cfg;
done_preparing = 1;
return external_diff_cmd;
}
static struct diff_tempfile {
const char *name; /* filename external diff should read from */
char hex[41];
char mode[10];
char tmp_path[PATH_MAX];
} diff_temp[2];
typedef unsigned long (*sane_truncate_fn)(char *line, unsigned long len);
struct emit_callback {
int color_diff;
unsigned ws_rule;
int blank_at_eof_in_preimage;
int blank_at_eof_in_postimage;
int lno_in_preimage;
int lno_in_postimage;
sane_truncate_fn truncate;
const char **label_path;
struct diff_words_data *diff_words;
struct diff_options *opt;
int *found_changesp;
struct strbuf *header;
};
static int count_lines(const char *data, int size)
{
int count, ch, completely_empty = 1, nl_just_seen = 0;
count = 0;
while (0 < size--) {
ch = *data++;
if (ch == '\n') {
count++;
nl_just_seen = 1;
completely_empty = 0;
}
else {
nl_just_seen = 0;
completely_empty = 0;
}
}
if (completely_empty)
return 0;
if (!nl_just_seen)
count++; /* no trailing newline */
return count;
}
static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
{
if (!DIFF_FILE_VALID(one)) {
mf->ptr = (char *)""; /* does not matter */
mf->size = 0;
return 0;
}
else if (diff_populate_filespec(one, 0))
return -1;
mf->ptr = one->data;
mf->size = one->size;
return 0;
}
static int count_trailing_blank(mmfile_t *mf, unsigned ws_rule)
{
char *ptr = mf->ptr;
long size = mf->size;
int cnt = 0;
if (!size)
return cnt;
ptr += size - 1; /* pointing at the very end */
if (*ptr != '\n')
; /* incomplete line */
else
ptr--; /* skip the last LF */
while (mf->ptr < ptr) {
char *prev_eol;
for (prev_eol = ptr; mf->ptr <= prev_eol; prev_eol--)
if (*prev_eol == '\n')
break;
if (!ws_blank_line(prev_eol + 1, ptr - prev_eol, ws_rule))
break;
cnt++;
ptr = prev_eol - 1;
}
return cnt;
}
static void check_blank_at_eof(mmfile_t *mf1, mmfile_t *mf2,
struct emit_callback *ecbdata)
{
int l1, l2, at;
unsigned ws_rule = ecbdata->ws_rule;
l1 = count_trailing_blank(mf1, ws_rule);
l2 = count_trailing_blank(mf2, ws_rule);
if (l2 <= l1) {
ecbdata->blank_at_eof_in_preimage = 0;
ecbdata->blank_at_eof_in_postimage = 0;
return;
}
at = count_lines(mf1->ptr, mf1->size);
ecbdata->blank_at_eof_in_preimage = (at - l1) + 1;
at = count_lines(mf2->ptr, mf2->size);
ecbdata->blank_at_eof_in_postimage = (at - l2) + 1;
}
static void emit_line_0(struct diff_options *o, const char *set, const char *reset,
int first, const char *line, int len)
{
int has_trailing_newline, has_trailing_carriage_return;
int nofirst;
FILE *file = o->file;
if (o->output_prefix) {
struct strbuf *msg = NULL;
msg = o->output_prefix(o, o->output_prefix_data);
assert(msg);
fwrite(msg->buf, msg->len, 1, file);
}
if (len == 0) {
has_trailing_newline = (first == '\n');
has_trailing_carriage_return = (!has_trailing_newline &&
(first == '\r'));
nofirst = has_trailing_newline || has_trailing_carriage_return;
} else {
has_trailing_newline = (len > 0 && line[len-1] == '\n');
if (has_trailing_newline)
len--;
has_trailing_carriage_return = (len > 0 && line[len-1] == '\r');
if (has_trailing_carriage_return)
len--;
nofirst = 0;
}
if (len || !nofirst) {
fputs(set, file);
if (!nofirst)
fputc(first, file);
fwrite(line, len, 1, file);
fputs(reset, file);
}
if (has_trailing_carriage_return)
fputc('\r', file);
if (has_trailing_newline)
fputc('\n', file);
}
static void emit_line(struct diff_options *o, const char *set, const char *reset,
const char *line, int len)
{
emit_line_0(o, set, reset, line[0], line+1, len-1);
}
static int new_blank_line_at_eof(struct emit_callback *ecbdata, const char *line, int len)
{
if (!((ecbdata->ws_rule & WS_BLANK_AT_EOF) &&
ecbdata->blank_at_eof_in_preimage &&
ecbdata->blank_at_eof_in_postimage &&
ecbdata->blank_at_eof_in_preimage <= ecbdata->lno_in_preimage &&
ecbdata->blank_at_eof_in_postimage <= ecbdata->lno_in_postimage))
return 0;
return ws_blank_line(line, len, ecbdata->ws_rule);
}
static void emit_add_line(const char *reset,
struct emit_callback *ecbdata,
const char *line, int len)
{
const char *ws = diff_get_color(ecbdata->color_diff, DIFF_WHITESPACE);
const char *set = diff_get_color(ecbdata->color_diff, DIFF_FILE_NEW);
if (!*ws)
emit_line_0(ecbdata->opt, set, reset, '+', line, len);
else if (new_blank_line_at_eof(ecbdata, line, len))
/* Blank line at EOF - paint '+' as well */
emit_line_0(ecbdata->opt, ws, reset, '+', line, len);
else {
/* Emit just the prefix, then the rest. */
emit_line_0(ecbdata->opt, set, reset, '+', "", 0);
ws_check_emit(line, len, ecbdata->ws_rule,
ecbdata->opt->file, set, reset, ws);
}
}
static void emit_hunk_header(struct emit_callback *ecbdata,
const char *line, int len)
{
const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
const char *frag = diff_get_color(ecbdata->color_diff, DIFF_FRAGINFO);
const char *func = diff_get_color(ecbdata->color_diff, DIFF_FUNCINFO);
const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
static const char atat[2] = { '@', '@' };
const char *cp, *ep;
struct strbuf msgbuf = STRBUF_INIT;
int org_len = len;
int i = 1;
/*
* As a hunk header must begin with "@@ -<old>, +<new> @@",
* it always is at least 10 bytes long.
*/
if (len < 10 ||
memcmp(line, atat, 2) ||
!(ep = memmem(line + 2, len - 2, atat, 2))) {
emit_line(ecbdata->opt, plain, reset, line, len);
return;
}
ep += 2; /* skip over @@ */
/* The hunk header in fraginfo color */
strbuf_add(&msgbuf, frag, strlen(frag));
strbuf_add(&msgbuf, line, ep - line);
strbuf_add(&msgbuf, reset, strlen(reset));
/*
* trailing "\r\n"
*/
for ( ; i < 3; i++)
if (line[len - i] == '\r' || line[len - i] == '\n')
len--;
/* blank before the func header */
for (cp = ep; ep - line < len; ep++)
if (*ep != ' ' && *ep != '\t')
break;
if (ep != cp) {
strbuf_add(&msgbuf, plain, strlen(plain));
strbuf_add(&msgbuf, cp, ep - cp);
strbuf_add(&msgbuf, reset, strlen(reset));
}
if (ep < line + len) {
strbuf_add(&msgbuf, func, strlen(func));
strbuf_add(&msgbuf, ep, line + len - ep);
strbuf_add(&msgbuf, reset, strlen(reset));
}
strbuf_add(&msgbuf, line + len, org_len - len);
emit_line(ecbdata->opt, "", "", msgbuf.buf, msgbuf.len);
strbuf_release(&msgbuf);
}
static struct diff_tempfile *claim_diff_tempfile(void) {
int i;
for (i = 0; i < ARRAY_SIZE(diff_temp); i++)
if (!diff_temp[i].name)
return diff_temp + i;
die("BUG: diff is failing to clean up its tempfiles");
}
static int remove_tempfile_installed;
static void remove_tempfile(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(diff_temp); i++) {
if (diff_temp[i].name == diff_temp[i].tmp_path)
unlink_or_warn(diff_temp[i].name);
diff_temp[i].name = NULL;
}
}
static void remove_tempfile_on_signal(int signo)
{
remove_tempfile();
sigchain_pop(signo);
raise(signo);
}
static void print_line_count(FILE *file, int count)
{
switch (count) {
case 0:
fprintf(file, "0,0");
break;
case 1:
fprintf(file, "1");
break;
default:
fprintf(file, "1,%d", count);
break;
}
}
static void emit_rewrite_lines(struct emit_callback *ecb,
int prefix, const char *data, int size)
{
const char *endp = NULL;
static const char *nneof = " No newline at end of file\n";
const char *old = diff_get_color(ecb->color_diff, DIFF_FILE_OLD);
const char *reset = diff_get_color(ecb->color_diff, DIFF_RESET);
while (0 < size) {
int len;
endp = memchr(data, '\n', size);
len = endp ? (endp - data + 1) : size;
if (prefix != '+') {
ecb->lno_in_preimage++;
emit_line_0(ecb->opt, old, reset, '-',
data, len);
} else {
ecb->lno_in_postimage++;
emit_add_line(reset, ecb, data, len);
}
size -= len;
data += len;
}
if (!endp) {
const char *plain = diff_get_color(ecb->color_diff,
DIFF_PLAIN);
emit_line_0(ecb->opt, plain, reset, '\\',
nneof, strlen(nneof));
}
}
static void emit_rewrite_diff(const char *name_a,
const char *name_b,
struct diff_filespec *one,
struct diff_filespec *two,
struct userdiff_driver *textconv_one,
struct userdiff_driver *textconv_two,
struct diff_options *o)
{
int lc_a, lc_b;
int color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
const char *name_a_tab, *name_b_tab;
const char *metainfo = diff_get_color(color_diff, DIFF_METAINFO);
const char *fraginfo = diff_get_color(color_diff, DIFF_FRAGINFO);
const char *reset = diff_get_color(color_diff, DIFF_RESET);
static struct strbuf a_name = STRBUF_INIT, b_name = STRBUF_INIT;
const char *a_prefix, *b_prefix;
char *data_one, *data_two;
size_t size_one, size_two;
struct emit_callback ecbdata;
char *line_prefix = "";
struct strbuf *msgbuf;
if (o && o->output_prefix) {
msgbuf = o->output_prefix(o, o->output_prefix_data);
line_prefix = msgbuf->buf;
}
if (diff_mnemonic_prefix && DIFF_OPT_TST(o, REVERSE_DIFF)) {
a_prefix = o->b_prefix;
b_prefix = o->a_prefix;
} else {
a_prefix = o->a_prefix;
b_prefix = o->b_prefix;
}
name_a += (*name_a == '/');
name_b += (*name_b == '/');
name_a_tab = strchr(name_a, ' ') ? "\t" : "";
name_b_tab = strchr(name_b, ' ') ? "\t" : "";
strbuf_reset(&a_name);
strbuf_reset(&b_name);
quote_two_c_style(&a_name, a_prefix, name_a, 0);
quote_two_c_style(&b_name, b_prefix, name_b, 0);
size_one = fill_textconv(textconv_one, one, &data_one);
size_two = fill_textconv(textconv_two, two, &data_two);
memset(&ecbdata, 0, sizeof(ecbdata));
ecbdata.color_diff = color_diff;
ecbdata.found_changesp = &o->found_changes;
ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
ecbdata.opt = o;
if (ecbdata.ws_rule & WS_BLANK_AT_EOF) {
mmfile_t mf1, mf2;
mf1.ptr = (char *)data_one;
mf2.ptr = (char *)data_two;
mf1.size = size_one;
mf2.size = size_two;
check_blank_at_eof(&mf1, &mf2, &ecbdata);
}
ecbdata.lno_in_preimage = 1;
ecbdata.lno_in_postimage = 1;
lc_a = count_lines(data_one, size_one);
lc_b = count_lines(data_two, size_two);
fprintf(o->file,
"%s%s--- %s%s%s\n%s%s+++ %s%s%s\n%s%s@@ -",
line_prefix, metainfo, a_name.buf, name_a_tab, reset,
line_prefix, metainfo, b_name.buf, name_b_tab, reset,
line_prefix, fraginfo);
print_line_count(o->file, lc_a);
fprintf(o->file, " +");
print_line_count(o->file, lc_b);
fprintf(o->file, " @@%s\n", reset);
if (lc_a)
emit_rewrite_lines(&ecbdata, '-', data_one, size_one);
if (lc_b)
emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
if (textconv_one)
free((char *)data_one);
if (textconv_two)
free((char *)data_two);
}
struct diff_words_buffer {
mmfile_t text;
long alloc;
struct diff_words_orig {
const char *begin, *end;
} *orig;
int orig_nr, orig_alloc;
};
static void diff_words_append(char *line, unsigned long len,
struct diff_words_buffer *buffer)
{
ALLOC_GROW(buffer->text.ptr, buffer->text.size + len, buffer->alloc);
line++;
len--;
memcpy(buffer->text.ptr + buffer->text.size, line, len);
buffer->text.size += len;
buffer->text.ptr[buffer->text.size] = '\0';
}
struct diff_words_style_elem
{
const char *prefix;
const char *suffix;
const char *color; /* NULL; filled in by the setup code if
* color is enabled */
};
struct diff_words_style
{
enum diff_words_type type;
struct diff_words_style_elem new, old, ctx;
const char *newline;
};
struct diff_words_style diff_words_styles[] = {
{ DIFF_WORDS_PORCELAIN, {"+", "\n"}, {"-", "\n"}, {" ", "\n"}, "~\n" },
{ DIFF_WORDS_PLAIN, {"{+", "+}"}, {"[-", "-]"}, {"", ""}, "\n" },
{ DIFF_WORDS_COLOR, {"", ""}, {"", ""}, {"", ""}, "\n" }
};
struct diff_words_data {
struct diff_words_buffer minus, plus;
const char *current_plus;
int last_minus;
struct diff_options *opt;
regex_t *word_regex;
enum diff_words_type type;
struct diff_words_style *style;
};
static int fn_out_diff_words_write_helper(FILE *fp,
struct diff_words_style_elem *st_el,
const char *newline,
size_t count, const char *buf,
const char *line_prefix)
{
int print = 0;
while (count) {
char *p = memchr(buf, '\n', count);
if (print)
fputs(line_prefix, fp);
if (p != buf) {
if (st_el->color && fputs(st_el->color, fp) < 0)
return -1;
if (fputs(st_el->prefix, fp) < 0 ||
fwrite(buf, p ? p - buf : count, 1, fp) != 1 ||
fputs(st_el->suffix, fp) < 0)
return -1;
if (st_el->color && *st_el->color
&& fputs(GIT_COLOR_RESET, fp) < 0)
return -1;
}
if (!p)
return 0;
if (fputs(newline, fp) < 0)
return -1;
count -= p + 1 - buf;
buf = p + 1;
print = 1;
}
return 0;
}
/*
* '--color-words' algorithm can be described as:
*
* 1. collect a the minus/plus lines of a diff hunk, divided into
* minus-lines and plus-lines;
*
* 2. break both minus-lines and plus-lines into words and
* place them into two mmfile_t with one word for each line;
*
* 3. use xdiff to run diff on the two mmfile_t to get the words level diff;
*
* And for the common parts of the both file, we output the plus side text.
* diff_words->current_plus is used to trace the current position of the plus file
* which printed. diff_words->last_minus is used to trace the last minus word
* printed.
*
* For '--graph' to work with '--color-words', we need to output the graph prefix
* on each line of color words output. Generally, there are two conditions on
* which we should output the prefix.
*
* 1. diff_words->last_minus == 0 &&
* diff_words->current_plus == diff_words->plus.text.ptr
*
* that is: the plus text must start as a new line, and if there is no minus
* word printed, a graph prefix must be printed.
*
* 2. diff_words->current_plus > diff_words->plus.text.ptr &&
* *(diff_words->current_plus - 1) == '\n'
*
* that is: a graph prefix must be printed following a '\n'
*/
static int color_words_output_graph_prefix(struct diff_words_data *diff_words)
{
if ((diff_words->last_minus == 0 &&
diff_words->current_plus == diff_words->plus.text.ptr) ||
(diff_words->current_plus > diff_words->plus.text.ptr &&
*(diff_words->current_plus - 1) == '\n')) {
return 1;
} else {
return 0;
}
}
static void fn_out_diff_words_aux(void *priv, char *line, unsigned long len)
{
struct diff_words_data *diff_words = priv;
struct diff_words_style *style = diff_words->style;
int minus_first, minus_len, plus_first, plus_len;
const char *minus_begin, *minus_end, *plus_begin, *plus_end;
struct diff_options *opt = diff_words->opt;
struct strbuf *msgbuf;
char *line_prefix = "";
if (line[0] != '@' || parse_hunk_header(line, len,
&minus_first, &minus_len, &plus_first, &plus_len))
return;
assert(opt);
if (opt->output_prefix) {
msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
line_prefix = msgbuf->buf;
}
/* POSIX requires that first be decremented by one if len == 0... */
if (minus_len) {
minus_begin = diff_words->minus.orig[minus_first].begin;
minus_end =
diff_words->minus.orig[minus_first + minus_len - 1].end;
} else
minus_begin = minus_end =
diff_words->minus.orig[minus_first].end;
if (plus_len) {
plus_begin = diff_words->plus.orig[plus_first].begin;
plus_end = diff_words->plus.orig[plus_first + plus_len - 1].end;
} else
plus_begin = plus_end = diff_words->plus.orig[plus_first].end;
if (color_words_output_graph_prefix(diff_words)) {
fputs(line_prefix, diff_words->opt->file);
}
if (diff_words->current_plus != plus_begin) {
fn_out_diff_words_write_helper(diff_words->opt->file,
&style->ctx, style->newline,
plus_begin - diff_words->current_plus,
diff_words->current_plus, line_prefix);
if (*(plus_begin - 1) == '\n')
fputs(line_prefix, diff_words->opt->file);
}
if (minus_begin != minus_end) {
fn_out_diff_words_write_helper(diff_words->opt->file,
&style->old, style->newline,
minus_end - minus_begin, minus_begin,
line_prefix);
}
if (plus_begin != plus_end) {
fn_out_diff_words_write_helper(diff_words->opt->file,
&style->new, style->newline,
plus_end - plus_begin, plus_begin,
line_prefix);
}
diff_words->current_plus = plus_end;
diff_words->last_minus = minus_first;
}
/* This function starts looking at *begin, and returns 0 iff a word was found. */
static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
int *begin, int *end)
{
if (word_regex && *begin < buffer->size) {
regmatch_t match[1];
if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
char *p = memchr(buffer->ptr + *begin + match[0].rm_so,
'\n', match[0].rm_eo - match[0].rm_so);
*end = p ? p - buffer->ptr : match[0].rm_eo + *begin;
*begin += match[0].rm_so;
return *begin >= *end;
}
return -1;
}
/* find the next word */
while (*begin < buffer->size && isspace(buffer->ptr[*begin]))
(*begin)++;
if (*begin >= buffer->size)
return -1;
/* find the end of the word */
*end = *begin + 1;
while (*end < buffer->size && !isspace(buffer->ptr[*end]))
(*end)++;
return 0;
}
/*
* This function splits the words in buffer->text, stores the list with
* newline separator into out, and saves the offsets of the original words
* in buffer->orig.
*/
static void diff_words_fill(struct diff_words_buffer *buffer, mmfile_t *out,
regex_t *word_regex)
{
int i, j;
long alloc = 0;
out->size = 0;
out->ptr = NULL;
/* fake an empty "0th" word */
ALLOC_GROW(buffer->orig, 1, buffer->orig_alloc);
buffer->orig[0].begin = buffer->orig[0].end = buffer->text.ptr;
buffer->orig_nr = 1;
for (i = 0; i < buffer->text.size; i++) {
if (find_word_boundaries(&buffer->text, word_regex, &i, &j))
return;
/* store original boundaries */
ALLOC_GROW(buffer->orig, buffer->orig_nr + 1,
buffer->orig_alloc);
buffer->orig[buffer->orig_nr].begin = buffer->text.ptr + i;
buffer->orig[buffer->orig_nr].end = buffer->text.ptr + j;
buffer->orig_nr++;
/* store one word */
ALLOC_GROW(out->ptr, out->size + j - i + 1, alloc);
memcpy(out->ptr + out->size, buffer->text.ptr + i, j - i);
out->ptr[out->size + j - i] = '\n';
out->size += j - i + 1;
i = j - 1;
}
}
/* this executes the word diff on the accumulated buffers */
static void diff_words_show(struct diff_words_data *diff_words)
{
xpparam_t xpp;
xdemitconf_t xecfg;
mmfile_t minus, plus;
struct diff_words_style *style = diff_words->style;
struct diff_options *opt = diff_words->opt;
struct strbuf *msgbuf;
char *line_prefix = "";
assert(opt);
if (opt->output_prefix) {
msgbuf = opt->output_prefix(opt, opt->output_prefix_data);
line_prefix = msgbuf->buf;
}
/* special case: only removal */
if (!diff_words->plus.text.size) {
fputs(line_prefix, diff_words->opt->file);
fn_out_diff_words_write_helper(diff_words->opt->file,
&style->old, style->newline,
diff_words->minus.text.size,
diff_words->minus.text.ptr, line_prefix);
diff_words->minus.text.size = 0;
return;
}
diff_words->current_plus = diff_words->plus.text.ptr;
diff_words->last_minus = 0;
memset(&xpp, 0, sizeof(xpp));
memset(&xecfg, 0, sizeof(xecfg));
diff_words_fill(&diff_words->minus, &minus, diff_words->word_regex);
diff_words_fill(&diff_words->plus, &plus, diff_words->word_regex);
xpp.flags = 0;
/* as only the hunk header will be parsed, we need a 0-context */
xecfg.ctxlen = 0;
xdi_diff_outf(&minus, &plus, fn_out_diff_words_aux, diff_words,
&xpp, &xecfg);
free(minus.ptr);
free(plus.ptr);
if (diff_words->current_plus != diff_words->plus.text.ptr +
diff_words->plus.text.size) {
if (color_words_output_graph_prefix(diff_words))
fputs(line_prefix, diff_words->opt->file);
fn_out_diff_words_write_helper(diff_words->opt->file,
&style->ctx, style->newline,
diff_words->plus.text.ptr + diff_words->plus.text.size
- diff_words->current_plus, diff_words->current_plus,
line_prefix);
}
diff_words->minus.text.size = diff_words->plus.text.size = 0;
}
/* In "color-words" mode, show word-diff of words accumulated in the buffer */
static void diff_words_flush(struct emit_callback *ecbdata)
{
if (ecbdata->diff_words->minus.text.size ||
ecbdata->diff_words->plus.text.size)
diff_words_show(ecbdata->diff_words);
}
static void free_diff_words_data(struct emit_callback *ecbdata)
{
if (ecbdata->diff_words) {
diff_words_flush(ecbdata);
free (ecbdata->diff_words->minus.text.ptr);
free (ecbdata->diff_words->minus.orig);
free (ecbdata->diff_words->plus.text.ptr);
free (ecbdata->diff_words->plus.orig);
free(ecbdata->diff_words->word_regex);
free(ecbdata->diff_words);
ecbdata->diff_words = NULL;
}
}
const char *diff_get_color(int diff_use_color, enum color_diff ix)
{
if (diff_use_color)
return diff_colors[ix];
return "";
}
static unsigned long sane_truncate_line(struct emit_callback *ecb, char *line, unsigned long len)
{
const char *cp;
unsigned long allot;
size_t l = len;
if (ecb->truncate)
return ecb->truncate(line, len);
cp = line;
allot = l;
while (0 < l) {
(void) utf8_width(&cp, &l);
if (!cp)
break; /* truncated in the middle? */
}
return allot - l;
}
static void find_lno(const char *line, struct emit_callback *ecbdata)
{
const char *p;
ecbdata->lno_in_preimage = 0;
ecbdata->lno_in_postimage = 0;
p = strchr(line, '-');
if (!p)
return; /* cannot happen */
ecbdata->lno_in_preimage = strtol(p + 1, NULL, 10);
p = strchr(p, '+');
if (!p)
return; /* cannot happen */
ecbdata->lno_in_postimage = strtol(p + 1, NULL, 10);
}
static void fn_out_consume(void *priv, char *line, unsigned long len)
{
struct emit_callback *ecbdata = priv;
const char *meta = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
const char *plain = diff_get_color(ecbdata->color_diff, DIFF_PLAIN);
const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
struct diff_options *o = ecbdata->opt;
char *line_prefix = "";
struct strbuf *msgbuf;
if (o && o->output_prefix) {
msgbuf = o->output_prefix(o, o->output_prefix_data);
line_prefix = msgbuf->buf;
}
if (ecbdata->header) {
fprintf(ecbdata->opt->file, "%s", ecbdata->header->buf);
strbuf_reset(ecbdata->header);
ecbdata->header = NULL;
}
*(ecbdata->found_changesp) = 1;
if (ecbdata->label_path[0]) {
const char *name_a_tab, *name_b_tab;
name_a_tab = strchr(ecbdata->label_path[0], ' ') ? "\t" : "";
name_b_tab = strchr(ecbdata->label_path[1], ' ') ? "\t" : "";
fprintf(ecbdata->opt->file, "%s%s--- %s%s%s\n",
line_prefix, meta, ecbdata->label_path[0], reset, name_a_tab);
fprintf(ecbdata->opt->file, "%s%s+++ %s%s%s\n",
line_prefix, meta, ecbdata->label_path[1], reset, name_b_tab);
ecbdata->label_path[0] = ecbdata->label_path[1] = NULL;
}
if (diff_suppress_blank_empty
&& len == 2 && line[0] == ' ' && line[1] == '\n') {
line[0] = '\n';
len = 1;
}
if (line[0] == '@') {
if (ecbdata->diff_words)
diff_words_flush(ecbdata);
len = sane_truncate_line(ecbdata, line, len);
find_lno(line, ecbdata);
emit_hunk_header(ecbdata, line, len);
if (line[len-1] != '\n')
putc('\n', ecbdata->opt->file);
return;
}
if (len < 1) {
emit_line(ecbdata->opt, reset, reset, line, len);
if (ecbdata->diff_words
&& ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN)
fputs("~\n", ecbdata->opt->file);
return;
}
if (ecbdata->diff_words) {
if (line[0] == '-') {
diff_words_append(line, len,
&ecbdata->diff_words->minus);
return;
} else if (line[0] == '+') {
diff_words_append(line, len,
&ecbdata->diff_words->plus);
return;
}
diff_words_flush(ecbdata);
if (ecbdata->diff_words->type == DIFF_WORDS_PORCELAIN) {
emit_line(ecbdata->opt, plain, reset, line, len);
fputs("~\n", ecbdata->opt->file);
} else {
/* don't print the prefix character */
emit_line(ecbdata->opt, plain, reset, line+1, len-1);
}
return;
}
if (line[0] != '+') {
const char *color =
diff_get_color(ecbdata->color_diff,
line[0] == '-' ? DIFF_FILE_OLD : DIFF_PLAIN);
ecbdata->lno_in_preimage++;
if (line[0] == ' ')
ecbdata->lno_in_postimage++;
emit_line(ecbdata->opt, color, reset, line, len);
} else {
ecbdata->lno_in_postimage++;
emit_add_line(reset, ecbdata, line + 1, len - 1);
}
}
static char *pprint_rename(const char *a, const char *b)
{
const char *old = a;
const char *new = b;
struct strbuf name = STRBUF_INIT;
int pfx_length, sfx_length;
int len_a = strlen(a);
int len_b = strlen(b);
int a_midlen, b_midlen;
int qlen_a = quote_c_style(a, NULL, NULL, 0);
int qlen_b = quote_c_style(b, NULL, NULL, 0);
if (qlen_a || qlen_b) {
quote_c_style(a, &name, NULL, 0);
strbuf_addstr(&name, " => ");
quote_c_style(b, &name, NULL, 0);
return strbuf_detach(&name, NULL);
}
/* Find common prefix */
pfx_length = 0;
while (*old && *new && *old == *new) {
if (*old == '/')
pfx_length = old - a + 1;
old++;
new++;
}
/* Find common suffix */
old = a + len_a;
new = b + len_b;
sfx_length = 0;
while (a <= old && b <= new && *old == *new) {
if (*old == '/')
sfx_length = len_a - (old - a);
old--;
new--;
}
/*
* pfx{mid-a => mid-b}sfx
* {pfx-a => pfx-b}sfx
* pfx{sfx-a => sfx-b}
* name-a => name-b
*/
a_midlen = len_a - pfx_length - sfx_length;
b_midlen = len_b - pfx_length - sfx_length;
if (a_midlen < 0)
a_midlen = 0;
if (b_midlen < 0)
b_midlen = 0;
strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
if (pfx_length + sfx_length) {
strbuf_add(&name, a, pfx_length);
strbuf_addch(&name, '{');
}
strbuf_add(&name, a + pfx_length, a_midlen);
strbuf_addstr(&name, " => ");
strbuf_add(&name, b + pfx_length, b_midlen);
if (pfx_length + sfx_length) {
strbuf_addch(&name, '}');
strbuf_add(&name, a + len_a - sfx_length, sfx_length);
}
return strbuf_detach(&name, NULL);
}
struct diffstat_t {
int nr;
int alloc;
struct diffstat_file {
char *from_name;
char *name;
char *print_name;
unsigned is_unmerged:1;
unsigned is_binary:1;
unsigned is_renamed:1;
uintmax_t added, deleted;
} **files;
};
static struct diffstat_file *diffstat_add(struct diffstat_t *diffstat,
const char *name_a,
const char *name_b)
{
struct diffstat_file *x;
x = xcalloc(sizeof (*x), 1);
if (diffstat->nr == diffstat->alloc) {
diffstat->alloc = alloc_nr(diffstat->alloc);
diffstat->files = xrealloc(diffstat->files,
diffstat->alloc * sizeof(x));
}
diffstat->files[diffstat->nr++] = x;
if (name_b) {
x->from_name = xstrdup(name_a);
x->name = xstrdup(name_b);
x->is_renamed = 1;
}
else {
x->from_name = NULL;
x->name = xstrdup(name_a);
}
return x;
}
static void diffstat_consume(void *priv, char *line, unsigned long len)
{
struct diffstat_t *diffstat = priv;
struct diffstat_file *x = diffstat->files[diffstat->nr - 1];
if (line[0] == '+')
x->added++;
else if (line[0] == '-')
x->deleted++;
}
const char mime_boundary_leader[] = "------------";
static int scale_linear(int it, int width, int max_change)
{
/*
* make sure that at least one '-' is printed if there were deletions,
* and likewise for '+'.
*/
if (max_change < 2)
return it;
return ((it - 1) * (width - 1) + max_change - 1) / (max_change - 1);
}
static void show_name(FILE *file,
const char *prefix, const char *name, int len)
{
fprintf(file, " %s%-*s |", prefix, len, name);
}
static void show_graph(FILE *file, char ch, int cnt, const char *set, const char *reset)
{
if (cnt <= 0)
return;
fprintf(file, "%s", set);
while (cnt--)
putc(ch, file);
fprintf(file, "%s", reset);
}
static void fill_print_name(struct diffstat_file *file)
{
char *pname;
if (file->print_name)
return;
if (!file->is_renamed) {
struct strbuf buf = STRBUF_INIT;
if (quote_c_style(file->name, &buf, NULL, 0)) {
pname = strbuf_detach(&buf, NULL);
} else {
pname = file->name;
strbuf_release(&buf);
}
} else {
pname = pprint_rename(file->from_name, file->name);
}
file->print_name = pname;
}
static void show_stats(struct diffstat_t *data, struct diff_options *options)
{
int i, len, add, del, adds = 0, dels = 0;
uintmax_t max_change = 0, max_len = 0;
int total_files = data->nr;
int width, name_width;
const char *reset, *set, *add_c, *del_c;
const char *line_prefix = "";
struct strbuf *msg = NULL;
if (data->nr == 0)
return;
if (options->output_prefix) {
msg = options->output_prefix(options, options->output_prefix_data);
line_prefix = msg->buf;
}
width = options->stat_width ? options->stat_width : 80;
name_width = options->stat_name_width ? options->stat_name_width : 50;
/* Sanity: give at least 5 columns to the graph,
* but leave at least 10 columns for the name.
*/
if (width < 25)
width = 25;
if (name_width < 10)
name_width = 10;
else if (width < name_width + 15)
name_width = width - 15;
/* Find the longest filename and max number of changes */
reset = diff_get_color_opt(options, DIFF_RESET);
set = diff_get_color_opt(options, DIFF_PLAIN);
add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
for (i = 0; i < data->nr; i++) {
struct diffstat_file *file = data->files[i];
uintmax_t change = file->added + file->deleted;
fill_print_name(file);
len = strlen(file->print_name);
if (max_len < len)
max_len = len;
if (file->is_binary || file->is_unmerged)
continue;
if (max_change < change)
max_change = change;
}
/* Compute the width of the graph part;
* 10 is for one blank at the beginning of the line plus
* " | count " between the name and the graph.
*
* From here on, name_width is the width of the name area,
* and width is the width of the graph area.
*/
name_width = (name_width < max_len) ? name_width : max_len;
if (width < (name_width + 10) + max_change)
width = width - (name_width + 10);
else
width = max_change;
for (i = 0; i < data->nr; i++) {
const char *prefix = "";
char *name = data->files[i]->print_name;
uintmax_t added = data->files[i]->added;
uintmax_t deleted = data->files[i]->deleted;
int name_len;
/*
* "scale" the filename
*/
len = name_width;
name_len = strlen(name);
if (name_width < name_len) {
char *slash;
prefix = "...";
len -= 3;
name += name_len - len;
slash = strchr(name, '/');
if (slash)
name = slash;
}
if (data->files[i]->is_binary) {
fprintf(options->file, "%s", line_prefix);
show_name(options->file, prefix, name, len);
fprintf(options->file, " Bin ");
fprintf(options->file, "%s%"PRIuMAX"%s",
del_c, deleted, reset);
fprintf(options->file, " -> ");
fprintf(options->file, "%s%"PRIuMAX"%s",
add_c, added, reset);
fprintf(options->file, " bytes");
fprintf(options->file, "\n");
continue;
}
else if (data->files[i]->is_unmerged) {
fprintf(options->file, "%s", line_prefix);
show_name(options->file, prefix, name, len);
fprintf(options->file, " Unmerged\n");
continue;
}
else if (!data->files[i]->is_renamed &&
(added + deleted == 0)) {
total_files--;
continue;
}
/*
* scale the add/delete
*/
add = added;
del = deleted;
adds += add;
dels += del;
if (width <= max_change) {
add = scale_linear(add, width, max_change);
del = scale_linear(del, width, max_change);
}
fprintf(options->file, "%s", line_prefix);
show_name(options->file, prefix, name, len);
fprintf(options->file, "%5"PRIuMAX"%s", added + deleted,
added + deleted ? " " : "");
show_graph(options->file, '+', add, add_c, reset);
show_graph(options->file, '-', del, del_c, reset);
fprintf(options->file, "\n");
}
fprintf(options->file, "%s", line_prefix);
fprintf(options->file,
" %d files changed, %d insertions(+), %d deletions(-)\n",
total_files, adds, dels);
}
static void show_shortstats(struct diffstat_t *data, struct diff_options *options)
{
int i, adds = 0, dels = 0, total_files = data->nr;
if (data->nr == 0)
return;
for (i = 0; i < data->nr; i++) {
if (!data->files[i]->is_binary &&
!data->files[i]->is_unmerged) {
int added = data->files[i]->added;
int deleted= data->files[i]->deleted;
if (!data->files[i]->is_renamed &&
(added + deleted == 0)) {
total_files--;
} else {
adds += added;
dels += deleted;
}
}
}
if (options->output_prefix) {
struct strbuf *msg = NULL;
msg = options->output_prefix(options,
options->output_prefix_data);
fprintf(options->file, "%s", msg->buf);
}
fprintf(options->file, " %d files changed, %d insertions(+), %d deletions(-)\n",
total_files, adds, dels);
}
static void show_numstat(struct diffstat_t *data, struct diff_options *options)
{
int i;
if (data->nr == 0)
return;
for (i = 0; i < data->nr; i++) {
struct diffstat_file *file = data->files[i];
if (options->output_prefix) {
struct strbuf *msg = NULL;
msg = options->output_prefix(options,
options->output_prefix_data);
fprintf(options->file, "%s", msg->buf);
}
if (file->is_binary)
fprintf(options->file, "-\t-\t");
else
fprintf(options->file,
"%"PRIuMAX"\t%"PRIuMAX"\t",
file->added, file->deleted);
if (options->line_termination) {
fill_print_name(file);
if (!file->is_renamed)
write_name_quoted(file->name, options->file,
options->line_termination);
else {
fputs(file->print_name, options->file);
putc(options->line_termination, options->file);
}
} else {
if (file->is_renamed) {
putc('\0', options->file);
write_name_quoted(file->from_name, options->file, '\0');
}
write_name_quoted(file->name, options->file, '\0');
}
}
}
struct dirstat_file {
const char *name;
unsigned long changed;
};
struct dirstat_dir {
struct dirstat_file *files;
int alloc, nr, percent, cumulative;
};
static long gather_dirstat(struct diff_options *opt, struct dirstat_dir *dir,
unsigned long changed, const char *base, int baselen)
{
unsigned long this_dir = 0;
unsigned int sources = 0;
const char *line_prefix = "";
struct strbuf *msg = NULL;
if (opt->output_prefix) {
msg = opt->output_prefix(opt, opt->output_prefix_data);
line_prefix = msg->buf;
}
while (dir->nr) {
struct dirstat_file *f = dir->files;
int namelen = strlen(f->name);
unsigned long this;
char *slash;
if (namelen < baselen)
break;
if (memcmp(f->name, base, baselen))
break;
slash = strchr(f->name + baselen, '/');
if (slash) {
int newbaselen = slash + 1 - f->name;
this = gather_dirstat(opt, dir, changed, f->name, newbaselen);
sources++;
} else {
this = f->changed;
dir->files++;
dir->nr--;
sources += 2;
}
this_dir += this;
}
/*
* We don't report dirstat's for
* - the top level
* - or cases where everything came from a single directory
* under this directory (sources == 1).
*/
if (baselen && sources != 1) {
int permille = this_dir * 1000 / changed;
if (permille) {
int percent = permille / 10;
if (percent >= dir->percent) {
fprintf(opt->file, "%s%4d.%01d%% %.*s\n", line_prefix,
percent, permille % 10, baselen, base);
if (!dir->cumulative)
return 0;
}
}
}
return this_dir;
}
static int dirstat_compare(const void *_a, const void *_b)
{
const struct dirstat_file *a = _a;
const struct dirstat_file *b = _b;
return strcmp(a->name, b->name);
}
static void show_dirstat(struct diff_options *options)
{
int i;
unsigned long changed;
struct dirstat_dir dir;
struct diff_queue_struct *q = &diff_queued_diff;
dir.files = NULL;
dir.alloc = 0;
dir.nr = 0;
dir.percent = options->dirstat_percent;
dir.cumulative = DIFF_OPT_TST(options, DIRSTAT_CUMULATIVE);
changed = 0;
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
const char *name;
unsigned long copied, added, damage;
name = p->one->path ? p->one->path : p->two->path;
if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
diff_populate_filespec(p->one, 0);
diff_populate_filespec(p->two, 0);
diffcore_count_changes(p->one, p->two, NULL, NULL, 0,
&copied, &added);
diff_free_filespec_data(p->one);
diff_free_filespec_data(p->two);
} else if (DIFF_FILE_VALID(p->one)) {
diff_populate_filespec(p->one, 1);
copied = added = 0;
diff_free_filespec_data(p->one);
} else if (DIFF_FILE_VALID(p->two)) {
diff_populate_filespec(p->two, 1);
copied = 0;
added = p->two->size;
diff_free_filespec_data(p->two);
} else
continue;
/*
* Original minus copied is the removed material,
* added is the new material. They are both damages
* made to the preimage. In --dirstat-by-file mode, count
* damaged files, not damaged lines. This is done by
* counting only a single damaged line per file.
*/
damage = (p->one->size - copied) + added;
if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE) && damage > 0)
damage = 1;
ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
dir.files[dir.nr].name = name;
dir.files[dir.nr].changed = damage;
changed += damage;
dir.nr++;
}
/* This can happen even with many files, if everything was renames */
if (!changed)
return;
/* Show all directories with more than x% of the changes */
qsort(dir.files, dir.nr, sizeof(dir.files[0]), dirstat_compare);
gather_dirstat(options, &dir, changed, "", 0);
}
static void free_diffstat_info(struct diffstat_t *diffstat)
{
int i;
for (i = 0; i < diffstat->nr; i++) {
struct diffstat_file *f = diffstat->files[i];
if (f->name != f->print_name)
free(f->print_name);
free(f->name);
free(f->from_name);
free(f);
}
free(diffstat->files);
}
struct checkdiff_t {
const char *filename;
int lineno;
int conflict_marker_size;
struct diff_options *o;
unsigned ws_rule;
unsigned status;
};
static int is_conflict_marker(const char *line, int marker_size, unsigned long len)
{
char firstchar;
int cnt;
if (len < marker_size + 1)
return 0;
firstchar = line[0];
switch (firstchar) {
case '=': case '>': case '<': case '|':
break;
default:
return 0;
}
for (cnt = 1; cnt < marker_size; cnt++)
if (line[cnt] != firstchar)
return 0;
/* line[1] thru line[marker_size-1] are same as firstchar */
if (len < marker_size + 1 || !isspace(line[marker_size]))
return 0;
return 1;
}
static void checkdiff_consume(void *priv, char *line, unsigned long len)
{
struct checkdiff_t *data = priv;
int color_diff = DIFF_OPT_TST(data->o, COLOR_DIFF);
int marker_size = data->conflict_marker_size;
const char *ws = diff_get_color(color_diff, DIFF_WHITESPACE);
const char *reset = diff_get_color(color_diff, DIFF_RESET);
const char *set = diff_get_color(color_diff, DIFF_FILE_NEW);
char *err;
char *line_prefix = "";
struct strbuf *msgbuf;
assert(data->o);
if (data->o->output_prefix) {
msgbuf = data->o->output_prefix(data->o,
data->o->output_prefix_data);
line_prefix = msgbuf->buf;
}
if (line[0] == '+') {
unsigned bad;
data->lineno++;
if (is_conflict_marker(line + 1, marker_size, len - 1)) {
data->status |= 1;
fprintf(data->o->file,
"%s%s:%d: leftover conflict marker\n",
line_prefix, data->filename, data->lineno);
}
bad = ws_check(line + 1, len - 1, data->ws_rule);
if (!bad)
return;
data->status |= bad;
err = whitespace_error_string(bad);
fprintf(data->o->file, "%s%s:%d: %s.\n",
line_prefix, data->filename, data->lineno, err);
free(err);
emit_line(data->o, set, reset, line, 1);
ws_check_emit(line + 1, len - 1, data->ws_rule,
data->o->file, set, reset, ws);
} else if (line[0] == ' ') {
data->lineno++;
} else if (line[0] == '@') {
char *plus = strchr(line, '+');
if (plus)
data->lineno = strtol(plus, NULL, 10) - 1;
else
die("invalid diff");
}
}
static unsigned char *deflate_it(char *data,
unsigned long size,
unsigned long *result_size)
{
int bound;
unsigned char *deflated;
z_stream stream;
memset(&stream, 0, sizeof(stream));
deflateInit(&stream, zlib_compression_level);
bound = deflateBound(&stream, size);
deflated = xmalloc(bound);
stream.next_out = deflated;
stream.avail_out = bound;
stream.next_in = (unsigned char *)data;
stream.avail_in = size;
while (deflate(&stream, Z_FINISH) == Z_OK)
; /* nothing */
deflateEnd(&stream);
*result_size = stream.total_out;
return deflated;
}
static void emit_binary_diff_body(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
{
void *cp;
void *delta;
void *deflated;
void *data;
unsigned long orig_size;
unsigned long delta_size;
unsigned long deflate_size;
unsigned long data_size;
/* We could do deflated delta, or we could do just deflated two,
* whichever is smaller.
*/
delta = NULL;
deflated = deflate_it(two->ptr, two->size, &deflate_size);
if (one->size && two->size) {
delta = diff_delta(one->ptr, one->size,
two->ptr, two->size,
&delta_size, deflate_size);
if (delta) {
void *to_free = delta;
orig_size = delta_size;
delta = deflate_it(delta, delta_size, &delta_size);
free(to_free);
}
}
if (delta && delta_size < deflate_size) {
fprintf(file, "%sdelta %lu\n", prefix, orig_size);
free(deflated);
data = delta;
data_size = delta_size;
}
else {
fprintf(file, "%sliteral %lu\n", prefix, two->size);
free(delta);
data = deflated;
data_size = deflate_size;
}
/* emit data encoded in base85 */
cp = data;
while (data_size) {
int bytes = (52 < data_size) ? 52 : data_size;
char line[70];
data_size -= bytes;
if (bytes <= 26)
line[0] = bytes + 'A' - 1;
else
line[0] = bytes - 26 + 'a' - 1;
encode_85(line + 1, cp, bytes);
cp = (char *) cp + bytes;
fprintf(file, "%s", prefix);
fputs(line, file);
fputc('\n', file);
}
fprintf(file, "%s\n", prefix);
free(data);
}
static void emit_binary_diff(FILE *file, mmfile_t *one, mmfile_t *two, char *prefix)
{
fprintf(file, "%sGIT binary patch\n", prefix);
emit_binary_diff_body(file, one, two, prefix);
emit_binary_diff_body(file, two, one, prefix);
}
static void diff_filespec_load_driver(struct diff_filespec *one)
{
if (!one->driver)
one->driver = userdiff_find_by_path(one->path);
if (!one->driver)
one->driver = userdiff_find_by_name("default");
}
int diff_filespec_is_binary(struct diff_filespec *one)
{
if (one->is_binary == -1) {
diff_filespec_load_driver(one);
if (one->driver->binary != -1)
one->is_binary = one->driver->binary;
else {
if (!one->data && DIFF_FILE_VALID(one))
diff_populate_filespec(one, 0);
if (one->data)
one->is_binary = buffer_is_binary(one->data,
one->size);
if (one->is_binary == -1)
one->is_binary = 0;
}
}
return one->is_binary;
}
static const struct userdiff_funcname *diff_funcname_pattern(struct diff_filespec *one)
{
diff_filespec_load_driver(one);
return one->driver->funcname.pattern ? &one->driver->funcname : NULL;
}
static const char *userdiff_word_regex(struct diff_filespec *one)
{
diff_filespec_load_driver(one);
return one->driver->word_regex;
}
void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b)
{
if (!options->a_prefix)
options->a_prefix = a;
if (!options->b_prefix)
options->b_prefix = b;
}
struct userdiff_driver *get_textconv(struct diff_filespec *one)
{
if (!DIFF_FILE_VALID(one))
return NULL;
if (!S_ISREG(one->mode))
return NULL;
diff_filespec_load_driver(one);
if (!one->driver->textconv)
return NULL;
if (one->driver->textconv_want_cache && !one->driver->textconv_cache) {
struct notes_cache *c = xmalloc(sizeof(*c));
struct strbuf name = STRBUF_INIT;
strbuf_addf(&name, "textconv/%s", one->driver->name);
notes_cache_init(c, name.buf, one->driver->textconv);
one->driver->textconv_cache = c;
}
return one->driver;
}
static void builtin_diff(const char *name_a,
const char *name_b,
struct diff_filespec *one,
struct diff_filespec *two,
const char *xfrm_msg,
int must_show_header,
struct diff_options *o,
int complete_rewrite)
{
mmfile_t mf1, mf2;
const char *lbl[2];
char *a_one, *b_two;
const char *set = diff_get_color_opt(o, DIFF_METAINFO);
const char *reset = diff_get_color_opt(o, DIFF_RESET);
const char *a_prefix, *b_prefix;
struct userdiff_driver *textconv_one = NULL;
struct userdiff_driver *textconv_two = NULL;
struct strbuf header = STRBUF_INIT;
struct strbuf *msgbuf;
char *line_prefix = "";
if (o->output_prefix) {
msgbuf = o->output_prefix(o, o->output_prefix_data);
line_prefix = msgbuf->buf;
}
if (DIFF_OPT_TST(o, SUBMODULE_LOG) &&
(!one->mode || S_ISGITLINK(one->mode)) &&
(!two->mode || S_ISGITLINK(two->mode))) {
const char *del = diff_get_color_opt(o, DIFF_FILE_OLD);
const char *add = diff_get_color_opt(o, DIFF_FILE_NEW);
show_submodule_summary(o->file, one ? one->path : two->path,
one->sha1, two->sha1, two->dirty_submodule,
del, add, reset);
return;
}
if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
textconv_one = get_textconv(one);
textconv_two = get_textconv(two);
}
diff_set_mnemonic_prefix(o, "a/", "b/");
if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
a_prefix = o->b_prefix;
b_prefix = o->a_prefix;
} else {
a_prefix = o->a_prefix;
b_prefix = o->b_prefix;
}
/* Never use a non-valid filename anywhere if at all possible */
name_a = DIFF_FILE_VALID(one) ? name_a : name_b;
name_b = DIFF_FILE_VALID(two) ? name_b : name_a;
a_one = quote_two(a_prefix, name_a + (*name_a == '/'));
b_two = quote_two(b_prefix, name_b + (*name_b == '/'));
lbl[0] = DIFF_FILE_VALID(one) ? a_one : "/dev/null";
lbl[1] = DIFF_FILE_VALID(two) ? b_two : "/dev/null";
strbuf_addf(&header, "%s%sdiff --git %s %s%s\n", line_prefix, set, a_one, b_two, reset);
if (lbl[0][0] == '/') {
/* /dev/null */
strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, set, two->mode, reset);
if (xfrm_msg)
strbuf_addstr(&header, xfrm_msg);
must_show_header = 1;
}
else if (lbl[1][0] == '/') {
strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, set, one->mode, reset);
if (xfrm_msg)
strbuf_addstr(&header, xfrm_msg);
must_show_header = 1;
}
else {
if (one->mode != two->mode) {
strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, set, one->mode, reset);
strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, set, two->mode, reset);
must_show_header = 1;
}
if (xfrm_msg)
strbuf_addstr(&header, xfrm_msg);
/*
* we do not run diff between different kind
* of objects.
*/
if ((one->mode ^ two->mode) & S_IFMT)
goto free_ab_and_return;
if (complete_rewrite &&
(textconv_one || !diff_filespec_is_binary(one)) &&
(textconv_two || !diff_filespec_is_binary(two))) {
fprintf(o->file, "%s", header.buf);
strbuf_reset(&header);
emit_rewrite_diff(name_a, name_b, one, two,
textconv_one, textconv_two, o);
o->found_changes = 1;
goto free_ab_and_return;
}
}
if (!DIFF_OPT_TST(o, TEXT) &&
( (!textconv_one && diff_filespec_is_binary(one)) ||
(!textconv_two && diff_filespec_is_binary(two)) )) {
if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
die("unable to read files to diff");
/* Quite common confusing case */
if (mf1.size == mf2.size &&
!memcmp(mf1.ptr, mf2.ptr, mf1.size)) {
if (must_show_header)
fprintf(o->file, "%s", header.buf);
goto free_ab_and_return;
}
fprintf(o->file, "%s", header.buf);
strbuf_reset(&header);
if (DIFF_OPT_TST(o, BINARY))
emit_binary_diff(o->file, &mf1, &mf2, line_prefix);
else
fprintf(o->file, "%sBinary files %s and %s differ\n",
line_prefix, lbl[0], lbl[1]);
o->found_changes = 1;
}
else {
/* Crazy xdl interfaces.. */
const char *diffopts = getenv("GIT_DIFF_OPTS");
xpparam_t xpp;
xdemitconf_t xecfg;
struct emit_callback ecbdata;
const struct userdiff_funcname *pe;
if (!DIFF_XDL_TST(o, WHITESPACE_FLAGS) || must_show_header) {
fprintf(o->file, "%s", header.buf);
strbuf_reset(&header);
}
mf1.size = fill_textconv(textconv_one, one, &mf1.ptr);
mf2.size = fill_textconv(textconv_two, two, &mf2.ptr);
pe = diff_funcname_pattern(one);
if (!pe)
pe = diff_funcname_pattern(two);
memset(&xpp, 0, sizeof(xpp));
memset(&xecfg, 0, sizeof(xecfg));
memset(&ecbdata, 0, sizeof(ecbdata));
ecbdata.label_path = lbl;
ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
ecbdata.found_changesp = &o->found_changes;
ecbdata.ws_rule = whitespace_rule(name_b ? name_b : name_a);
if (ecbdata.ws_rule & WS_BLANK_AT_EOF)
check_blank_at_eof(&mf1, &mf2, &ecbdata);
ecbdata.opt = o;
ecbdata.header = header.len ? &header : NULL;
xpp.flags = o->xdl_opts;
xecfg.ctxlen = o->context;
xecfg.interhunkctxlen = o->interhunkcontext;
xecfg.flags = XDL_EMIT_FUNCNAMES;
if (pe)
xdiff_set_find_func(&xecfg, pe->pattern, pe->cflags);
if (!diffopts)
;
else if (!prefixcmp(diffopts, "--unified="))
xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
else if (!prefixcmp(diffopts, "-u"))
xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
if (o->word_diff) {
int i;
ecbdata.diff_words =
xcalloc(1, sizeof(struct diff_words_data));
ecbdata.diff_words->type = o->word_diff;
ecbdata.diff_words->opt = o;
if (!o->word_regex)
o->word_regex = userdiff_word_regex(one);
if (!o->word_regex)
o->word_regex = userdiff_word_regex(two);
if (!o->word_regex)
o->word_regex = diff_word_regex_cfg;
if (o->word_regex) {
ecbdata.diff_words->word_regex = (regex_t *)
xmalloc(sizeof(regex_t));
if (regcomp(ecbdata.diff_words->word_regex,
o->word_regex,
REG_EXTENDED | REG_NEWLINE))
die ("Invalid regular expression: %s",
o->word_regex);
}
for (i = 0; i < ARRAY_SIZE(diff_words_styles); i++) {
if (o->word_diff == diff_words_styles[i].type) {
ecbdata.diff_words->style =
&diff_words_styles[i];
break;
}
}
if (DIFF_OPT_TST(o, COLOR_DIFF)) {
struct diff_words_style *st = ecbdata.diff_words->style;
st->old.color = diff_get_color_opt(o, DIFF_FILE_OLD);
st->new.color = diff_get_color_opt(o, DIFF_FILE_NEW);
st->ctx.color = diff_get_color_opt(o, DIFF_PLAIN);
}
}
xdi_diff_outf(&mf1, &mf2, fn_out_consume, &ecbdata,
&xpp, &xecfg);
if (o->word_diff)
free_diff_words_data(&ecbdata);
if (textconv_one)
free(mf1.ptr);
if (textconv_two)
free(mf2.ptr);
xdiff_clear_find_func(&xecfg);
}
free_ab_and_return:
strbuf_release(&header);
diff_free_filespec_data(one);
diff_free_filespec_data(two);
free(a_one);
free(b_two);
return;
}
static void builtin_diffstat(const char *name_a, const char *name_b,
struct diff_filespec *one,
struct diff_filespec *two,
struct diffstat_t *diffstat,
struct diff_options *o,
int complete_rewrite)
{
mmfile_t mf1, mf2;
struct diffstat_file *data;
data = diffstat_add(diffstat, name_a, name_b);
if (!one || !two) {
data->is_unmerged = 1;
return;
}
if (complete_rewrite) {
diff_populate_filespec(one, 0);
diff_populate_filespec(two, 0);
data->deleted = count_lines(one->data, one->size);
data->added = count_lines(two->data, two->size);
goto free_and_return;
}
if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
die("unable to read files to diff");
if (diff_filespec_is_binary(one) || diff_filespec_is_binary(two)) {
data->is_binary = 1;
data->added = mf2.size;
data->deleted = mf1.size;
} else {
/* Crazy xdl interfaces.. */
xpparam_t xpp;
xdemitconf_t xecfg;
memset(&xpp, 0, sizeof(xpp));
memset(&xecfg, 0, sizeof(xecfg));
xpp.flags = o->xdl_opts;
xdi_diff_outf(&mf1, &mf2, diffstat_consume, diffstat,
&xpp, &xecfg);
}
free_and_return:
diff_free_filespec_data(one);
diff_free_filespec_data(two);
}
static void builtin_checkdiff(const char *name_a, const char *name_b,
const char *attr_path,
struct diff_filespec *one,
struct diff_filespec *two,
struct diff_options *o)
{
mmfile_t mf1, mf2;
struct checkdiff_t data;
if (!two)
return;
memset(&data, 0, sizeof(data));
data.filename = name_b ? name_b : name_a;
data.lineno = 0;
data.o = o;
data.ws_rule = whitespace_rule(attr_path);
data.conflict_marker_size = ll_merge_marker_size(attr_path);
if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
die("unable to read files to diff");
/*
* All the other codepaths check both sides, but not checking
* the "old" side here is deliberate. We are checking the newly
* introduced changes, and as long as the "new" side is text, we
* can and should check what it introduces.
*/
if (diff_filespec_is_binary(two))
goto free_and_return;
else {
/* Crazy xdl interfaces.. */
xpparam_t xpp;
xdemitconf_t xecfg;
memset(&xpp, 0, sizeof(xpp));
memset(&xecfg, 0, sizeof(xecfg));
xecfg.ctxlen = 1; /* at least one context line */
xpp.flags = 0;
xdi_diff_outf(&mf1, &mf2, checkdiff_consume, &data,
&xpp, &xecfg);
if (data.ws_rule & WS_BLANK_AT_EOF) {
struct emit_callback ecbdata;
int blank_at_eof;
ecbdata.ws_rule = data.ws_rule;
check_blank_at_eof(&mf1, &mf2, &ecbdata);
blank_at_eof = ecbdata.blank_at_eof_in_preimage;
if (blank_at_eof) {
static char *err;
if (!err)
err = whitespace_error_string(WS_BLANK_AT_EOF);
fprintf(o->file, "%s:%d: %s.\n",
data.filename, blank_at_eof, err);
data.status = 1; /* report errors */
}
}
}
free_and_return:
diff_free_filespec_data(one);
diff_free_filespec_data(two);
if (data.status)
DIFF_OPT_SET(o, CHECK_FAILED);
}
struct diff_filespec *alloc_filespec(const char *path)
{
int namelen = strlen(path);
struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
memset(spec, 0, sizeof(*spec));
spec->path = (char *)(spec + 1);
memcpy(spec->path, path, namelen+1);
spec->count = 1;
spec->is_binary = -1;
return spec;
}
void free_filespec(struct diff_filespec *spec)
{
if (!--spec->count) {
diff_free_filespec_data(spec);
free(spec);
}
}
void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
unsigned short mode)
{
if (mode) {
spec->mode = canon_mode(mode);
hashcpy(spec->sha1, sha1);
spec->sha1_valid = !is_null_sha1(sha1);
}
}
/*
* Given a name and sha1 pair, if the index tells us the file in
* the work tree has that object contents, return true, so that
* prepare_temp_file() does not have to inflate and extract.
*/
static int reuse_worktree_file(const char *name, const unsigned char *sha1, int want_file)
{
struct cache_entry *ce;
struct stat st;
int pos, len;
/*
* We do not read the cache ourselves here, because the
* benchmark with my previous version that always reads cache
* shows that it makes things worse for diff-tree comparing
* two linux-2.6 kernel trees in an already checked out work
* tree. This is because most diff-tree comparisons deal with
* only a small number of files, while reading the cache is
* expensive for a large project, and its cost outweighs the
* savings we get by not inflating the object to a temporary
* file. Practically, this code only helps when we are used
* by diff-cache --cached, which does read the cache before
* calling us.
*/
if (!active_cache)
return 0;
/* We want to avoid the working directory if our caller
* doesn't need the data in a normal file, this system
* is rather slow with its stat/open/mmap/close syscalls,
* and the object is contained in a pack file. The pack
* is probably already open and will be faster to obtain
* the data through than the working directory. Loose
* objects however would tend to be slower as they need
* to be individually opened and inflated.
*/
if (!FAST_WORKING_DIRECTORY && !want_file && has_sha1_pack(sha1))
return 0;
len = strlen(name);
pos = cache_name_pos(name, len);
if (pos < 0)
return 0;
ce = active_cache[pos];
/*
* This is not the sha1 we are looking for, or
* unreusable because it is not a regular file.
*/
if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
return 0;
/*
* If ce is marked as "assume unchanged", there is no
* guarantee that work tree matches what we are looking for.
*/
if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce))
return 0;
/*
* If ce matches the file in the work tree, we can reuse it.
*/
if (ce_uptodate(ce) ||
(!lstat(name, &st) && !ce_match_stat(ce, &st, 0)))
return 1;
return 0;
}
static int populate_from_stdin(struct diff_filespec *s)
{
struct strbuf buf = STRBUF_INIT;
size_t size = 0;
if (strbuf_read(&buf, 0, 0) < 0)
return error("error while reading from stdin %s",
strerror(errno));
s->should_munmap = 0;
s->data = strbuf_detach(&buf, &size);
s->size = size;
s->should_free = 1;
return 0;
}
static int diff_populate_gitlink(struct diff_filespec *s, int size_only)
{
int len;
char *data = xmalloc(100), *dirty = "";
/* Are we looking at the work tree? */
if (s->dirty_submodule)
dirty = "-dirty";
len = snprintf(data, 100,
"Subproject commit %s%s\n", sha1_to_hex(s->sha1), dirty);
s->data = data;
s->size = len;
s->should_free = 1;
if (size_only) {
s->data = NULL;
free(data);
}
return 0;
}
/*
* While doing rename detection and pickaxe operation, we may need to
* grab the data for the blob (or file) for our own in-core comparison.
* diff_filespec has data and size fields for this purpose.
*/
int diff_populate_filespec(struct diff_filespec *s, int size_only)
{
int err = 0;
if (!DIFF_FILE_VALID(s))
die("internal error: asking to populate invalid file.");
if (S_ISDIR(s->mode))
return -1;
if (s->data)
return 0;
if (size_only && 0 < s->size)
return 0;
if (S_ISGITLINK(s->mode))
return diff_populate_gitlink(s, size_only);
if (!s->sha1_valid ||
reuse_worktree_file(s->path, s->sha1, 0)) {
struct strbuf buf = STRBUF_INIT;
struct stat st;
int fd;
if (!strcmp(s->path, "-"))
return populate_from_stdin(s);
if (lstat(s->path, &st) < 0) {
if (errno == ENOENT) {
err_empty:
err = -1;
empty:
s->data = (char *)"";
s->size = 0;
return err;
}
}
s->size = xsize_t(st.st_size);
if (!s->size)
goto empty;
if (S_ISLNK(st.st_mode)) {
struct strbuf sb = STRBUF_INIT;
if (strbuf_readlink(&sb, s->path, s->size))
goto err_empty;
s->size = sb.len;
s->data = strbuf_detach(&sb, NULL);
s->should_free = 1;
return 0;
}
if (size_only)
return 0;
fd = open(s->path, O_RDONLY);
if (fd < 0)
goto err_empty;
s->data = xmmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
close(fd);
s->should_munmap = 1;
/*
* Convert from working tree format to canonical git format
*/
if (convert_to_git(s->path, s->data, s->size, &buf, safe_crlf)) {
size_t size = 0;
munmap(s->data, s->size);
s->should_munmap = 0;
s->data = strbuf_detach(&buf, &size);
s->size = size;
s->should_free = 1;
}
}
else {
enum object_type type;
if (size_only)
type = sha1_object_info(s->sha1, &s->size);
else {
s->data = read_sha1_file(s->sha1, &type, &s->size);
s->should_free = 1;
}
}
return 0;
}
void diff_free_filespec_blob(struct diff_filespec *s)
{
if (s->should_free)
free(s->data);
else if (s->should_munmap)
munmap(s->data, s->size);
if (s->should_free || s->should_munmap) {
s->should_free = s->should_munmap = 0;
s->data = NULL;
}
}
void diff_free_filespec_data(struct diff_filespec *s)
{
diff_free_filespec_blob(s);
free(s->cnt_data);
s->cnt_data = NULL;
}
static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
void *blob,
unsigned long size,
const unsigned char *sha1,
int mode)
{
int fd;
struct strbuf buf = STRBUF_INIT;
struct strbuf template = STRBUF_INIT;
char *path_dup = xstrdup(path);
const char *base = basename(path_dup);
/* Generate "XXXXXX_basename.ext" */
strbuf_addstr(&template, "XXXXXX_");
strbuf_addstr(&template, base);
fd = git_mkstemps(temp->tmp_path, PATH_MAX, template.buf,
strlen(base) + 1);
if (fd < 0)
die_errno("unable to create temp-file");
if (convert_to_working_tree(path,
(const char *)blob, (size_t)size, &buf)) {
blob = buf.buf;
size = buf.len;
}
if (write_in_full(fd, blob, size) != size)
die_errno("unable to write temp-file");
close(fd);
temp->name = temp->tmp_path;
strcpy(temp->hex, sha1_to_hex(sha1));
temp->hex[40] = 0;
sprintf(temp->mode, "%06o", mode);
strbuf_release(&buf);
strbuf_release(&template);
free(path_dup);
}
static struct diff_tempfile *prepare_temp_file(const char *name,
struct diff_filespec *one)
{
struct diff_tempfile *temp = claim_diff_tempfile();
if (!DIFF_FILE_VALID(one)) {
not_a_valid_file:
/* A '-' entry produces this for file-2, and
* a '+' entry produces this for file-1.
*/
temp->name = "/dev/null";
strcpy(temp->hex, ".");
strcpy(temp->mode, ".");
return temp;
}
if (!remove_tempfile_installed) {
atexit(remove_tempfile);
sigchain_push_common(remove_tempfile_on_signal);
remove_tempfile_installed = 1;
}
if (!one->sha1_valid ||
reuse_worktree_file(name, one->sha1, 1)) {
struct stat st;
if (lstat(name, &st) < 0) {
if (errno == ENOENT)
goto not_a_valid_file;
die_errno("stat(%s)", name);
}
if (S_ISLNK(st.st_mode)) {
struct strbuf sb = STRBUF_INIT;
if (strbuf_readlink(&sb, name, st.st_size) < 0)
die_errno("readlink(%s)", name);
prep_temp_blob(name, temp, sb.buf, sb.len,
(one->sha1_valid ?
one->sha1 : null_sha1),
(one->sha1_valid ?
one->mode : S_IFLNK));
strbuf_release(&sb);
}
else {
/* we can borrow from the file in the work tree */
temp->name = name;
if (!one->sha1_valid)
strcpy(temp->hex, sha1_to_hex(null_sha1));
else
strcpy(temp->hex, sha1_to_hex(one->sha1));
/* Even though we may sometimes borrow the
* contents from the work tree, we always want
* one->mode. mode is trustworthy even when
* !(one->sha1_valid), as long as
* DIFF_FILE_VALID(one).
*/
sprintf(temp->mode, "%06o", one->mode);
}
return temp;
}
else {
if (diff_populate_filespec(one, 0))
die("cannot read data blob for %s", one->path);
prep_temp_blob(name, temp, one->data, one->size,
one->sha1, one->mode);
}
return temp;
}
/* An external diff command takes:
*
* diff-cmd name infile1 infile1-sha1 infile1-mode \
* infile2 infile2-sha1 infile2-mode [ rename-to ]
*
*/
static void run_external_diff(const char *pgm,
const char *name,
const char *other,
struct diff_filespec *one,
struct diff_filespec *two,
const char *xfrm_msg,
int complete_rewrite)
{
const char *spawn_arg[10];
int retval;
const char **arg = &spawn_arg[0];
if (one && two) {
struct diff_tempfile *temp_one, *temp_two;
const char *othername = (other ? other : name);
temp_one = prepare_temp_file(name, one);
temp_two = prepare_temp_file(othername, two);
*arg++ = pgm;
*arg++ = name;
*arg++ = temp_one->name;
*arg++ = temp_one->hex;
*arg++ = temp_one->mode;
*arg++ = temp_two->name;
*arg++ = temp_two->hex;
*arg++ = temp_two->mode;
if (other) {
*arg++ = other;
*arg++ = xfrm_msg;
}
} else {
*arg++ = pgm;
*arg++ = name;
}
*arg = NULL;
fflush(NULL);
retval = run_command_v_opt(spawn_arg, RUN_USING_SHELL);
remove_tempfile();
if (retval) {
fprintf(stderr, "external diff died, stopping at %s.\n", name);
exit(1);
}
}
static int similarity_index(struct diff_filepair *p)
{
return p->score * 100 / MAX_SCORE;
}
static void fill_metainfo(struct strbuf *msg,
const char *name,
const char *other,
struct diff_filespec *one,
struct diff_filespec *two,
struct diff_options *o,
struct diff_filepair *p,
int *must_show_header,
int use_color)
{
const char *set = diff_get_color(use_color, DIFF_METAINFO);
const char *reset = diff_get_color(use_color, DIFF_RESET);
struct strbuf *msgbuf;
char *line_prefix = "";
*must_show_header = 1;
if (o->output_prefix) {
msgbuf = o->output_prefix(o, o->output_prefix_data);
line_prefix = msgbuf->buf;
}
strbuf_init(msg, PATH_MAX * 2 + 300);
switch (p->status) {
case DIFF_STATUS_COPIED:
strbuf_addf(msg, "%s%ssimilarity index %d%%",
line_prefix, set, similarity_index(p));
strbuf_addf(msg, "%s\n%s%scopy from ",
reset, line_prefix, set);
quote_c_style(name, msg, NULL, 0);
strbuf_addf(msg, "%s\n%s%scopy to ", reset, line_prefix, set);
quote_c_style(other, msg, NULL, 0);
strbuf_addf(msg, "%s\n", reset);
break;
case DIFF_STATUS_RENAMED:
strbuf_addf(msg, "%s%ssimilarity index %d%%",
line_prefix, set, similarity_index(p));
strbuf_addf(msg, "%s\n%s%srename from ",
reset, line_prefix, set);
quote_c_style(name, msg, NULL, 0);
strbuf_addf(msg, "%s\n%s%srename to ",
reset, line_prefix, set);
quote_c_style(other, msg, NULL, 0);
strbuf_addf(msg, "%s\n", reset);
break;
case DIFF_STATUS_MODIFIED:
if (p->score) {
strbuf_addf(msg, "%s%sdissimilarity index %d%%%s\n",
line_prefix,
set, similarity_index(p), reset);
break;
}
/* fallthru */
default:
*must_show_header = 0;
}
if (one && two && hashcmp(one->sha1, two->sha1)) {
int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
if (DIFF_OPT_TST(o, BINARY)) {
mmfile_t mf;
if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
(!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
abbrev = 40;
}
strbuf_addf(msg, "%s%sindex %s..", line_prefix, set,
find_unique_abbrev(one->sha1, abbrev));
strbuf_addstr(msg, find_unique_abbrev(two->sha1, abbrev));
if (one->mode == two->mode)
strbuf_addf(msg, " %06o", one->mode);
strbuf_addf(msg, "%s\n", reset);
}
}
static void run_diff_cmd(const char *pgm,
const char *name,
const char *other,
const char *attr_path,
struct diff_filespec *one,
struct diff_filespec *two,
struct strbuf *msg,
struct diff_options *o,
struct diff_filepair *p)
{
const char *xfrm_msg = NULL;
int complete_rewrite = (p->status == DIFF_STATUS_MODIFIED) && p->score;
int must_show_header = 0;
if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
pgm = NULL;
else {
struct userdiff_driver *drv = userdiff_find_by_path(attr_path);
if (drv && drv->external)
pgm = drv->external;
}
if (msg) {
/*
* don't use colors when the header is intended for an
* external diff driver
*/
fill_metainfo(msg, name, other, one, two, o, p,
&must_show_header,
DIFF_OPT_TST(o, COLOR_DIFF) && !pgm);
xfrm_msg = msg->len ? msg->buf : NULL;
}
if (pgm) {
run_external_diff(pgm, name, other, one, two, xfrm_msg,
complete_rewrite);
return;
}
if (one && two)
builtin_diff(name, other ? other : name,
one, two, xfrm_msg, must_show_header,
o, complete_rewrite);
else
fprintf(o->file, "* Unmerged path %s\n", name);
}
static void diff_fill_sha1_info(struct diff_filespec *one)
{
if (DIFF_FILE_VALID(one)) {
if (!one->sha1_valid) {
struct stat st;
if (!strcmp(one->path, "-")) {
hashcpy(one->sha1, null_sha1);
return;
}
if (lstat(one->path, &st) < 0)
die_errno("stat '%s'", one->path);
if (index_path(one->sha1, one->path, &st, 0))
die("cannot hash %s", one->path);
}
}
else
hashclr(one->sha1);
}
static void strip_prefix(int prefix_length, const char **namep, const char **otherp)
{
/* Strip the prefix but do not molest /dev/null and absolute paths */
if (*namep && **namep != '/') {
*namep += prefix_length;
if (**namep == '/')
++*namep;
}
if (*otherp && **otherp != '/') {
*otherp += prefix_length;
if (**otherp == '/')
++*otherp;
}
}
static void run_diff(struct diff_filepair *p, struct diff_options *o)
{
const char *pgm = external_diff();
struct strbuf msg;
struct diff_filespec *one = p->one;
struct diff_filespec *two = p->two;
const char *name;
const char *other;
const char *attr_path;
name = p->one->path;
other = (strcmp(name, p->two->path) ? p->two->path : NULL);
attr_path = name;
if (o->prefix_length)
strip_prefix(o->prefix_length, &name, &other);
if (DIFF_PAIR_UNMERGED(p)) {
run_diff_cmd(pgm, name, NULL, attr_path,
NULL, NULL, NULL, o, p);
return;
}
diff_fill_sha1_info(one);
diff_fill_sha1_info(two);
if (!pgm &&
DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
(S_IFMT & one->mode) != (S_IFMT & two->mode)) {
/*
* a filepair that changes between file and symlink
* needs to be split into deletion and creation.
*/
struct diff_filespec *null = alloc_filespec(two->path);
run_diff_cmd(NULL, name, other, attr_path,
one, null, &msg, o, p);
free(null);
strbuf_release(&msg);
null = alloc_filespec(one->path);
run_diff_cmd(NULL, name, other, attr_path,
null, two, &msg, o, p);
free(null);
}
else
run_diff_cmd(pgm, name, other, attr_path,
one, two, &msg, o, p);
strbuf_release(&msg);
}
static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
struct diffstat_t *diffstat)
{
const char *name;
const char *other;
int complete_rewrite = 0;
if (DIFF_PAIR_UNMERGED(p)) {
/* unmerged */
builtin_diffstat(p->one->path, NULL, NULL, NULL, diffstat, o, 0);
return;
}
name = p->one->path;
other = (strcmp(name, p->two->path) ? p->two->path : NULL);
if (o->prefix_length)
strip_prefix(o->prefix_length, &name, &other);
diff_fill_sha1_info(p->one);
diff_fill_sha1_info(p->two);
if (p->status == DIFF_STATUS_MODIFIED && p->score)
complete_rewrite = 1;
builtin_diffstat(name, other, p->one, p->two, diffstat, o, complete_rewrite);
}
static void run_checkdiff(struct diff_filepair *p, struct diff_options *o)
{
const char *name;
const char *other;
const char *attr_path;
if (DIFF_PAIR_UNMERGED(p)) {
/* unmerged */
return;
}
name = p->one->path;
other = (strcmp(name, p->two->path) ? p->two->path : NULL);
attr_path = other ? other : name;
if (o->prefix_length)
strip_prefix(o->prefix_length, &name, &other);
diff_fill_sha1_info(p->one);
diff_fill_sha1_info(p->two);
builtin_checkdiff(name, other, attr_path, p->one, p->two, o);
}
void diff_setup(struct diff_options *options)
{
memset(options, 0, sizeof(*options));
options->file = stdout;
options->line_termination = '\n';
options->break_opt = -1;
options->rename_limit = -1;
options->dirstat_percent = 3;
options->context = 3;
options->change = diff_change;
options->add_remove = diff_addremove;
if (diff_use_color_default > 0)
DIFF_OPT_SET(options, COLOR_DIFF);
options->detect_rename = diff_detect_rename_default;
if (diff_no_prefix) {
options->a_prefix = options->b_prefix = "";
} else if (!diff_mnemonic_prefix) {
options->a_prefix = "a/";
options->b_prefix = "b/";
}
}
int diff_setup_done(struct diff_options *options)
{
int count = 0;
if (options->output_format & DIFF_FORMAT_NAME)
count++;
if (options->output_format & DIFF_FORMAT_NAME_STATUS)
count++;
if (options->output_format & DIFF_FORMAT_CHECKDIFF)
count++;
if (options->output_format & DIFF_FORMAT_NO_OUTPUT)
count++;
if (count > 1)
die("--name-only, --name-status, --check and -s are mutually exclusive");
/*
* Most of the time we can say "there are changes"
* only by checking if there are changed paths, but
* --ignore-whitespace* options force us to look
* inside contents.
*/
if (DIFF_XDL_TST(options, IGNORE_WHITESPACE) ||
DIFF_XDL_TST(options, IGNORE_WHITESPACE_CHANGE) ||
DIFF_XDL_TST(options, IGNORE_WHITESPACE_AT_EOL))
DIFF_OPT_SET(options, DIFF_FROM_CONTENTS);
else
DIFF_OPT_CLR(options, DIFF_FROM_CONTENTS);
if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
options->detect_rename = DIFF_DETECT_COPY;
if (!DIFF_OPT_TST(options, RELATIVE_NAME))
options->prefix = NULL;
if (options->prefix)
options->prefix_length = strlen(options->prefix);
else
options->prefix_length = 0;
if (options->output_format & (DIFF_FORMAT_NAME |
DIFF_FORMAT_NAME_STATUS |
DIFF_FORMAT_CHECKDIFF |
DIFF_FORMAT_NO_OUTPUT))
options->output_format &= ~(DIFF_FORMAT_RAW |
DIFF_FORMAT_NUMSTAT |
DIFF_FORMAT_DIFFSTAT |
DIFF_FORMAT_SHORTSTAT |
DIFF_FORMAT_DIRSTAT |
DIFF_FORMAT_SUMMARY |
DIFF_FORMAT_PATCH);
/*
* These cases always need recursive; we do not drop caller-supplied
* recursive bits for other formats here.
*/
if (options->output_format & (DIFF_FORMAT_PATCH |
DIFF_FORMAT_NUMSTAT |
DIFF_FORMAT_DIFFSTAT |
DIFF_FORMAT_SHORTSTAT |
DIFF_FORMAT_DIRSTAT |
DIFF_FORMAT_SUMMARY |
DIFF_FORMAT_CHECKDIFF))
DIFF_OPT_SET(options, RECURSIVE);
/*
* Also pickaxe would not work very well if you do not say recursive
*/
if (options->pickaxe)
DIFF_OPT_SET(options, RECURSIVE);
/*
* When patches are generated, submodules diffed against the work tree
* must be checked for dirtiness too so it can be shown in the output
*/
if (options->output_format & DIFF_FORMAT_PATCH)
DIFF_OPT_SET(options, DIRTY_SUBMODULES);
if (options->detect_rename && options->rename_limit < 0)
options->rename_limit = diff_rename_limit_default;
if (options->setup & DIFF_SETUP_USE_CACHE) {
if (!active_cache)
/* read-cache does not die even when it fails
* so it is safe for us to do this here. Also
* it does not smudge active_cache or active_nr
* when it fails, so we do not have to worry about
* cleaning it up ourselves either.
*/
read_cache();
}
if (options->abbrev <= 0 || 40 < options->abbrev)
options->abbrev = 40; /* full */
/*
* It does not make sense to show the first hit we happened
* to have found. It does not make sense not to return with
* exit code in such a case either.
*/
if (DIFF_OPT_TST(options, QUICK)) {
options->output_format = DIFF_FORMAT_NO_OUTPUT;
DIFF_OPT_SET(options, EXIT_WITH_STATUS);
}
return 0;
}
static int opt_arg(const char *arg, int arg_short, const char *arg_long, int *val)
{
char c, *eq;
int len;
if (*arg != '-')
return 0;
c = *++arg;
if (!c)
return 0;
if (c == arg_short) {
c = *++arg;
if (!c)
return 1;
if (val && isdigit(c)) {
char *end;
int n = strtoul(arg, &end, 10);
if (*end)
return 0;
*val = n;
return 1;
}
return 0;
}
if (c != '-')
return 0;
arg++;
eq = strchr(arg, '=');
if (eq)
len = eq - arg;
else
len = strlen(arg);
if (!len || strncmp(arg, arg_long, len))
return 0;
if (eq) {
int n;
char *end;
if (!isdigit(*++eq))
return 0;
n = strtoul(eq, &end, 10);
if (*end)
return 0;
*val = n;
}
return 1;
}
static int diff_scoreopt_parse(const char *opt);
int diff_opt_parse(struct diff_options *options, const char **av, int ac)
{
const char *arg = av[0];
/* Output format options */
if (!strcmp(arg, "-p") || !strcmp(arg, "-u") || !strcmp(arg, "--patch"))
options->output_format |= DIFF_FORMAT_PATCH;
else if (opt_arg(arg, 'U', "unified", &options->context))
options->output_format |= DIFF_FORMAT_PATCH;
else if (!strcmp(arg, "--raw"))
options->output_format |= DIFF_FORMAT_RAW;
else if (!strcmp(arg, "--patch-with-raw"))
options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
else if (!strcmp(arg, "--numstat"))
options->output_format |= DIFF_FORMAT_NUMSTAT;
else if (!strcmp(arg, "--shortstat"))
options->output_format |= DIFF_FORMAT_SHORTSTAT;
else if (opt_arg(arg, 'X', "dirstat", &options->dirstat_percent))
options->output_format |= DIFF_FORMAT_DIRSTAT;
else if (!strcmp(arg, "--cumulative")) {
options->output_format |= DIFF_FORMAT_DIRSTAT;
DIFF_OPT_SET(options, DIRSTAT_CUMULATIVE);
} else if (opt_arg(arg, 0, "dirstat-by-file",
&options->dirstat_percent)) {
options->output_format |= DIFF_FORMAT_DIRSTAT;
DIFF_OPT_SET(options, DIRSTAT_BY_FILE);
}
else if (!strcmp(arg, "--check"))
options->output_format |= DIFF_FORMAT_CHECKDIFF;
else if (!strcmp(arg, "--summary"))
options->output_format |= DIFF_FORMAT_SUMMARY;
else if (!strcmp(arg, "--patch-with-stat"))
options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
else if (!strcmp(arg, "--name-only"))
options->output_format |= DIFF_FORMAT_NAME;
else if (!strcmp(arg, "--name-status"))
options->output_format |= DIFF_FORMAT_NAME_STATUS;
else if (!strcmp(arg, "-s"))
options->output_format |= DIFF_FORMAT_NO_OUTPUT;
else if (!prefixcmp(arg, "--stat")) {
char *end;
int width = options->stat_width;
int name_width = options->stat_name_width;
arg += 6;
end = (char *)arg;
switch (*arg) {
case '-':
if (!prefixcmp(arg, "-width="))
width = strtoul(arg + 7, &end, 10);
else if (!prefixcmp(arg, "-name-width="))
name_width = strtoul(arg + 12, &end, 10);
break;
case '=':
width = strtoul(arg+1, &end, 10);
if (*end == ',')
name_width = strtoul(end+1, &end, 10);
}
/* Important! This checks all the error cases! */
if (*end)
return 0;
options->output_format |= DIFF_FORMAT_DIFFSTAT;
options->stat_name_width = name_width;
options->stat_width = width;
}
/* renames options */
else if (!prefixcmp(arg, "-B")) {
if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
return -1;
}
else if (!prefixcmp(arg, "-M")) {
if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
return -1;
options->detect_rename = DIFF_DETECT_RENAME;
}
else if (!prefixcmp(arg, "-C")) {
if (options->detect_rename == DIFF_DETECT_COPY)
DIFF_OPT_SET(options, FIND_COPIES_HARDER);
if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
return -1;
options->detect_rename = DIFF_DETECT_COPY;
}
else if (!strcmp(arg, "--no-renames"))
options->detect_rename = 0;
else if (!strcmp(arg, "--relative"))
DIFF_OPT_SET(options, RELATIVE_NAME);
else if (!prefixcmp(arg, "--relative=")) {
DIFF_OPT_SET(options, RELATIVE_NAME);
options->prefix = arg + 11;
}
/* xdiff options */
else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
DIFF_XDL_SET(options, IGNORE_WHITESPACE);
else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
DIFF_XDL_SET(options, IGNORE_WHITESPACE_CHANGE);
else if (!strcmp(arg, "--ignore-space-at-eol"))
DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
else if (!strcmp(arg, "--patience"))
DIFF_XDL_SET(options, PATIENCE_DIFF);
/* flags options */
else if (!strcmp(arg, "--binary")) {
options->output_format |= DIFF_FORMAT_PATCH;
DIFF_OPT_SET(options, BINARY);
}
else if (!strcmp(arg, "--full-index"))
DIFF_OPT_SET(options, FULL_INDEX);
else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
DIFF_OPT_SET(options, TEXT);
else if (!strcmp(arg, "-R"))
DIFF_OPT_SET(options, REVERSE_DIFF);
else if (!strcmp(arg, "--find-copies-harder"))
DIFF_OPT_SET(options, FIND_COPIES_HARDER);
else if (!strcmp(arg, "--follow"))
DIFF_OPT_SET(options, FOLLOW_RENAMES);
else if (!strcmp(arg, "--color"))
DIFF_OPT_SET(options, COLOR_DIFF);
else if (!prefixcmp(arg, "--color=")) {
int value = git_config_colorbool(NULL, arg+8, -1);
if (value == 0)
DIFF_OPT_CLR(options, COLOR_DIFF);
else if (value > 0)
DIFF_OPT_SET(options, COLOR_DIFF);
else
return error("option `color' expects \"always\", \"auto\", or \"never\"");
}
else if (!strcmp(arg, "--no-color"))
DIFF_OPT_CLR(options, COLOR_DIFF);
else if (!strcmp(arg, "--color-words")) {
DIFF_OPT_SET(options, COLOR_DIFF);
options->word_diff = DIFF_WORDS_COLOR;
}
else if (!prefixcmp(arg, "--color-words=")) {
DIFF_OPT_SET(options, COLOR_DIFF);
options->word_diff = DIFF_WORDS_COLOR;
options->word_regex = arg + 14;
}
else if (!strcmp(arg, "--word-diff")) {
if (options->word_diff == DIFF_WORDS_NONE)
options->word_diff = DIFF_WORDS_PLAIN;
}
else if (!prefixcmp(arg, "--word-diff=")) {
const char *type = arg + 12;
if (!strcmp(type, "plain"))
options->word_diff = DIFF_WORDS_PLAIN;
else if (!strcmp(type, "color")) {
DIFF_OPT_SET(options, COLOR_DIFF);
options->word_diff = DIFF_WORDS_COLOR;
}
else if (!strcmp(type, "porcelain"))
options->word_diff = DIFF_WORDS_PORCELAIN;
else if (!strcmp(type, "none"))
options->word_diff = DIFF_WORDS_NONE;
else
die("bad --word-diff argument: %s", type);
}
else if (!prefixcmp(arg, "--word-diff-regex=")) {
if (options->word_diff == DIFF_WORDS_NONE)
options->word_diff = DIFF_WORDS_PLAIN;
options->word_regex = arg + 18;
}
else if (!strcmp(arg, "--exit-code"))
DIFF_OPT_SET(options, EXIT_WITH_STATUS);
else if (!strcmp(arg, "--quiet"))
DIFF_OPT_SET(options, QUICK);
else if (!strcmp(arg, "--ext-diff"))
DIFF_OPT_SET(options, ALLOW_EXTERNAL);
else if (!strcmp(arg, "--no-ext-diff"))
DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
else if (!strcmp(arg, "--textconv"))
DIFF_OPT_SET(options, ALLOW_TEXTCONV);
else if (!strcmp(arg, "--no-textconv"))
DIFF_OPT_CLR(options, ALLOW_TEXTCONV);
else if (!strcmp(arg, "--ignore-submodules"))
handle_ignore_submodules_arg(options, "all");
else if (!prefixcmp(arg, "--ignore-submodules="))
handle_ignore_submodules_arg(options, arg + 20);
else if (!strcmp(arg, "--submodule"))
DIFF_OPT_SET(options, SUBMODULE_LOG);
else if (!prefixcmp(arg, "--submodule=")) {
if (!strcmp(arg + 12, "log"))
DIFF_OPT_SET(options, SUBMODULE_LOG);
}
/* misc options */
else if (!strcmp(arg, "-z"))
options->line_termination = 0;
else if (!prefixcmp(arg, "-l"))
options->rename_limit = strtoul(arg+2, NULL, 10);
else if (!prefixcmp(arg, "-S"))
options->pickaxe = arg + 2;
else if (!strcmp(arg, "--pickaxe-all"))
options->pickaxe_opts = DIFF_PICKAXE_ALL;
else if (!strcmp(arg, "--pickaxe-regex"))
options->pickaxe_opts = DIFF_PICKAXE_REGEX;
else if (!prefixcmp(arg, "-O"))
options->orderfile = arg + 2;
else if (!prefixcmp(arg, "--diff-filter="))
options->filter = arg + 14;
else if (!strcmp(arg, "--abbrev"))
options->abbrev = DEFAULT_ABBREV;
else if (!prefixcmp(arg, "--abbrev=")) {
options->abbrev = strtoul(arg + 9, NULL, 10);
if (options->abbrev < MINIMUM_ABBREV)
options->abbrev = MINIMUM_ABBREV;
else if (40 < options->abbrev)
options->abbrev = 40;
}
else if (!prefixcmp(arg, "--src-prefix="))
options->a_prefix = arg + 13;
else if (!prefixcmp(arg, "--dst-prefix="))
options->b_prefix = arg + 13;
else if (!strcmp(arg, "--no-prefix"))
options->a_prefix = options->b_prefix = "";
else if (opt_arg(arg, '\0', "inter-hunk-context",
&options->interhunkcontext))
;
else if (!prefixcmp(arg, "--output=")) {
options->file = fopen(arg + strlen("--output="), "w");
if (!options->file)
die_errno("Could not open '%s'", arg + strlen("--output="));
options->close_file = 1;
} else
return 0;
return 1;
}
static int parse_num(const char **cp_p)
{
unsigned long num, scale;
int ch, dot;
const char *cp = *cp_p;
num = 0;
scale = 1;
dot = 0;
for (;;) {
ch = *cp;
if ( !dot && ch == '.' ) {
scale = 1;
dot = 1;
} else if ( ch == '%' ) {
scale = dot ? scale*100 : 100;
cp++; /* % is always at the end */
break;
} else if ( ch >= '0' && ch <= '9' ) {
if ( scale < 100000 ) {
scale *= 10;
num = (num*10) + (ch-'0');
}
} else {
break;
}
cp++;
}
*cp_p = cp;
/* user says num divided by scale and we say internally that
* is MAX_SCORE * num / scale.
*/
return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
}
static int diff_scoreopt_parse(const char *opt)
{
int opt1, opt2, cmd;
if (*opt++ != '-')
return -1;
cmd = *opt++;
if (cmd != 'M' && cmd != 'C' && cmd != 'B')
return -1; /* that is not a -M, -C nor -B option */
opt1 = parse_num(&opt);
if (cmd != 'B')
opt2 = 0;
else {
if (*opt == 0)
opt2 = 0;
else if (*opt != '/')
return -1; /* we expect -B80/99 or -B80 */
else {
opt++;
opt2 = parse_num(&opt);
}
}
if (*opt != 0)
return -1;
return opt1 | (opt2 << 16);
}
struct diff_queue_struct diff_queued_diff;
void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
{
if (queue->alloc <= queue->nr) {
queue->alloc = alloc_nr(queue->alloc);
queue->queue = xrealloc(queue->queue,
sizeof(dp) * queue->alloc);
}
queue->queue[queue->nr++] = dp;
}
struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
struct diff_filespec *one,
struct diff_filespec *two)
{
struct diff_filepair *dp = xcalloc(1, sizeof(*dp));
dp->one = one;
dp->two = two;
if (queue)
diff_q(queue, dp);
return dp;
}
void diff_free_filepair(struct diff_filepair *p)
{
free_filespec(p->one);
free_filespec(p->two);
free(p);
}
/* This is different from find_unique_abbrev() in that
* it stuffs the result with dots for alignment.
*/
const char *diff_unique_abbrev(const unsigned char *sha1, int len)
{
int abblen;
const char *abbrev;
if (len == 40)
return sha1_to_hex(sha1);
abbrev = find_unique_abbrev(sha1, len);
abblen = strlen(abbrev);
if (abblen < 37) {
static char hex[41];
if (len < abblen && abblen <= len + 2)
sprintf(hex, "%s%.*s", abbrev, len+3-abblen, "..");
else
sprintf(hex, "%s...", abbrev);
return hex;
}
return sha1_to_hex(sha1);
}
static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
{
int line_termination = opt->line_termination;
int inter_name_termination = line_termination ? '\t' : '\0';
if (opt->output_prefix) {
struct strbuf *msg = NULL;
msg = opt->output_prefix(opt, opt->output_prefix_data);
fprintf(opt->file, "%s", msg->buf);
}
if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
fprintf(opt->file, ":%06o %06o %s ", p->one->mode, p->two->mode,
diff_unique_abbrev(p->one->sha1, opt->abbrev));
fprintf(opt->file, "%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
}
if (p->score) {
fprintf(opt->file, "%c%03d%c", p->status, similarity_index(p),
inter_name_termination);
} else {
fprintf(opt->file, "%c%c", p->status, inter_name_termination);
}
if (p->status == DIFF_STATUS_COPIED ||
p->status == DIFF_STATUS_RENAMED) {
const char *name_a, *name_b;
name_a = p->one->path;
name_b = p->two->path;
strip_prefix(opt->prefix_length, &name_a, &name_b);
write_name_quoted(name_a, opt->file, inter_name_termination);
write_name_quoted(name_b, opt->file, line_termination);
} else {
const char *name_a, *name_b;
name_a = p->one->mode ? p->one->path : p->two->path;
name_b = NULL;
strip_prefix(opt->prefix_length, &name_a, &name_b);
write_name_quoted(name_a, opt->file, line_termination);
}
}
int diff_unmodified_pair(struct diff_filepair *p)
{
/* This function is written stricter than necessary to support
* the currently implemented transformers, but the idea is to
* let transformers to produce diff_filepairs any way they want,
* and filter and clean them up here before producing the output.
*/
struct diff_filespec *one = p->one, *two = p->two;
if (DIFF_PAIR_UNMERGED(p))
return 0; /* unmerged is interesting */
/* deletion, addition, mode or type change
* and rename are all interesting.
*/
if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
DIFF_PAIR_MODE_CHANGED(p) ||
strcmp(one->path, two->path))
return 0;
/* both are valid and point at the same path. that is, we are
* dealing with a change.
*/
if (one->sha1_valid && two->sha1_valid &&
!hashcmp(one->sha1, two->sha1) &&
!one->dirty_submodule && !two->dirty_submodule)
return 1; /* no change */
if (!one->sha1_valid && !two->sha1_valid)
return 1; /* both look at the same file on the filesystem. */
return 0;
}
static void diff_flush_patch(struct diff_filepair *p, struct diff_options *o)
{
if (diff_unmodified_pair(p))
return;
if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
(DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
return; /* no tree diffs in patch format */
run_diff(p, o);
}
static void diff_flush_stat(struct diff_filepair *p, struct diff_options *o,
struct diffstat_t *diffstat)
{
if (diff_unmodified_pair(p))
return;
if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
(DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
return; /* no tree diffs in patch format */
run_diffstat(p, o, diffstat);
}
static void diff_flush_checkdiff(struct diff_filepair *p,
struct diff_options *o)
{
if (diff_unmodified_pair(p))
return;
if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
(DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
return; /* no tree diffs in patch format */
run_checkdiff(p, o);
}
int diff_queue_is_empty(void)
{
struct diff_queue_struct *q = &diff_queued_diff;
int i;
for (i = 0; i < q->nr; i++)
if (!diff_unmodified_pair(q->queue[i]))
return 0;
return 1;
}
#if DIFF_DEBUG
void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
{
fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
x, one ? one : "",
s->path,
DIFF_FILE_VALID(s) ? "valid" : "invalid",
s->mode,
s->sha1_valid ? sha1_to_hex(s->sha1) : "");
fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
x, one ? one : "",
s->size, s->xfrm_flags);
}
void diff_debug_filepair(const struct diff_filepair *p, int i)
{
diff_debug_filespec(p->one, i, "one");
diff_debug_filespec(p->two, i, "two");
fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
p->score, p->status ? p->status : '?',
p->one->rename_used, p->broken_pair);
}
void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
{
int i;
if (msg)
fprintf(stderr, "%s\n", msg);
fprintf(stderr, "q->nr = %d\n", q->nr);
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
diff_debug_filepair(p, i);
}
}
#endif
static void diff_resolve_rename_copy(void)
{
int i;
struct diff_filepair *p;
struct diff_queue_struct *q = &diff_queued_diff;
diff_debug_queue("resolve-rename-copy", q);
for (i = 0; i < q->nr; i++) {
p = q->queue[i];
p->status = 0; /* undecided */
if (DIFF_PAIR_UNMERGED(p))
p->status = DIFF_STATUS_UNMERGED;
else if (!DIFF_FILE_VALID(p->one))
p->status = DIFF_STATUS_ADDED;
else if (!DIFF_FILE_VALID(p->two))
p->status = DIFF_STATUS_DELETED;
else if (DIFF_PAIR_TYPE_CHANGED(p))
p->status = DIFF_STATUS_TYPE_CHANGED;
/* from this point on, we are dealing with a pair
* whose both sides are valid and of the same type, i.e.
* either in-place edit or rename/copy edit.
*/
else if (DIFF_PAIR_RENAME(p)) {
/*
* A rename might have re-connected a broken
* pair up, causing the pathnames to be the
* same again. If so, that's not a rename at
* all, just a modification..
*
* Otherwise, see if this source was used for
* multiple renames, in which case we decrement
* the count, and call it a copy.
*/
if (!strcmp(p->one->path, p->two->path))
p->status = DIFF_STATUS_MODIFIED;
else if (--p->one->rename_used > 0)
p->status = DIFF_STATUS_COPIED;
else
p->status = DIFF_STATUS_RENAMED;
}
else if (hashcmp(p->one->sha1, p->two->sha1) ||
p->one->mode != p->two->mode ||
p->one->dirty_submodule ||
p->two->dirty_submodule ||
is_null_sha1(p->one->sha1))
p->status = DIFF_STATUS_MODIFIED;
else {
/* This is a "no-change" entry and should not
* happen anymore, but prepare for broken callers.
*/
error("feeding unmodified %s to diffcore",
p->one->path);
p->status = DIFF_STATUS_UNKNOWN;
}
}
diff_debug_queue("resolve-rename-copy done", q);
}
static int check_pair_status(struct diff_filepair *p)
{
switch (p->status) {
case DIFF_STATUS_UNKNOWN:
return 0;
case 0:
die("internal error in diff-resolve-rename-copy");
default:
return 1;
}
}
static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
{
int fmt = opt->output_format;
if (fmt & DIFF_FORMAT_CHECKDIFF)
diff_flush_checkdiff(p, opt);
else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
diff_flush_raw(p, opt);
else if (fmt & DIFF_FORMAT_NAME) {
const char *name_a, *name_b;
name_a = p->two->path;
name_b = NULL;
strip_prefix(opt->prefix_length, &name_a, &name_b);
write_name_quoted(name_a, opt->file, opt->line_termination);
}
}
static void show_file_mode_name(FILE *file, const char *newdelete, struct diff_filespec *fs)
{
if (fs->mode)
fprintf(file, " %s mode %06o ", newdelete, fs->mode);
else
fprintf(file, " %s ", newdelete);
write_name_quoted(fs->path, file, '\n');
}
static void show_mode_change(FILE *file, struct diff_filepair *p, int show_name,
const char *line_prefix)
{
if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
fprintf(file, "%s mode change %06o => %06o%c", line_prefix, p->one->mode,
p->two->mode, show_name ? ' ' : '\n');
if (show_name) {
write_name_quoted(p->two->path, file, '\n');
}
}
}
static void show_rename_copy(FILE *file, const char *renamecopy, struct diff_filepair *p,
const char *line_prefix)
{
char *names = pprint_rename(p->one->path, p->two->path);
fprintf(file, " %s %s (%d%%)\n", renamecopy, names, similarity_index(p));
free(names);
show_mode_change(file, p, 0, line_prefix);
}
static void diff_summary(struct diff_options *opt, struct diff_filepair *p)
{
FILE *file = opt->file;
char *line_prefix = "";
if (opt->output_prefix) {
struct strbuf *buf = opt->output_prefix(opt, opt->output_prefix_data);
line_prefix = buf->buf;
}
switch(p->status) {
case DIFF_STATUS_DELETED:
fputs(line_prefix, file);
show_file_mode_name(file, "delete", p->one);
break;
case DIFF_STATUS_ADDED:
fputs(line_prefix, file);
show_file_mode_name(file, "create", p->two);
break;
case DIFF_STATUS_COPIED:
fputs(line_prefix, file);
show_rename_copy(file, "copy", p, line_prefix);
break;
case DIFF_STATUS_RENAMED:
fputs(line_prefix, file);
show_rename_copy(file, "rename", p, line_prefix);
break;
default:
if (p->score) {
fprintf(file, "%s rewrite ", line_prefix);
write_name_quoted(p->two->path, file, ' ');
fprintf(file, "(%d%%)\n", similarity_index(p));
}
show_mode_change(file, p, !p->score, line_prefix);
break;
}
}
struct patch_id_t {
git_SHA_CTX *ctx;
int patchlen;
};
static int remove_space(char *line, int len)
{
int i;
char *dst = line;
unsigned char c;
for (i = 0; i < len; i++)
if (!isspace((c = line[i])))
*dst++ = c;
return dst - line;
}
static void patch_id_consume(void *priv, char *line, unsigned long len)
{
struct patch_id_t *data = priv;
int new_len;
/* Ignore line numbers when computing the SHA1 of the patch */
if (!prefixcmp(line, "@@ -"))
return;
new_len = remove_space(line, len);
git_SHA1_Update(data->ctx, line, new_len);
data->patchlen += new_len;
}
/* returns 0 upon success, and writes result into sha1 */
static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
{
struct diff_queue_struct *q = &diff_queued_diff;
int i;
git_SHA_CTX ctx;
struct patch_id_t data;
char buffer[PATH_MAX * 4 + 20];
git_SHA1_Init(&ctx);
memset(&data, 0, sizeof(struct patch_id_t));
data.ctx = &ctx;
for (i = 0; i < q->nr; i++) {
xpparam_t xpp;
xdemitconf_t xecfg;
mmfile_t mf1, mf2;
struct diff_filepair *p = q->queue[i];
int len1, len2;
memset(&xpp, 0, sizeof(xpp));
memset(&xecfg, 0, sizeof(xecfg));
if (p->status == 0)
return error("internal diff status error");
if (p->status == DIFF_STATUS_UNKNOWN)
continue;
if (diff_unmodified_pair(p))
continue;
if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
(DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
continue;
if (DIFF_PAIR_UNMERGED(p))
continue;
diff_fill_sha1_info(p->one);
diff_fill_sha1_info(p->two);
if (fill_mmfile(&mf1, p->one) < 0 ||
fill_mmfile(&mf2, p->two) < 0)
return error("unable to read files to diff");
len1 = remove_space(p->one->path, strlen(p->one->path));
len2 = remove_space(p->two->path, strlen(p->two->path));
if (p->one->mode == 0)
len1 = snprintf(buffer, sizeof(buffer),
"diff--gita/%.*sb/%.*s"
"newfilemode%06o"
"---/dev/null"
"+++b/%.*s",
len1, p->one->path,
len2, p->two->path,
p->two->mode,
len2, p->two->path);
else if (p->two->mode == 0)
len1 = snprintf(buffer, sizeof(buffer),
"diff--gita/%.*sb/%.*s"
"deletedfilemode%06o"
"---a/%.*s"
"+++/dev/null",
len1, p->one->path,
len2, p->two->path,
p->one->mode,
len1, p->one->path);
else
len1 = snprintf(buffer, sizeof(buffer),
"diff--gita/%.*sb/%.*s"
"---a/%.*s"
"+++b/%.*s",
len1, p->one->path,
len2, p->two->path,
len1, p->one->path,
len2, p->two->path);
git_SHA1_Update(&ctx, buffer, len1);
xpp.flags = 0;
xecfg.ctxlen = 3;
xecfg.flags = XDL_EMIT_FUNCNAMES;
xdi_diff_outf(&mf1, &mf2, patch_id_consume, &data,
&xpp, &xecfg);
}
git_SHA1_Final(sha1, &ctx);
return 0;
}
int diff_flush_patch_id(struct diff_options *options, unsigned char *sha1)
{
struct diff_queue_struct *q = &diff_queued_diff;
int i;
int result = diff_get_patch_id(options, sha1);
for (i = 0; i < q->nr; i++)
diff_free_filepair(q->queue[i]);
free(q->queue);
DIFF_QUEUE_CLEAR(q);
return result;
}
static int is_summary_empty(const struct diff_queue_struct *q)
{
int i;
for (i = 0; i < q->nr; i++) {
const struct diff_filepair *p = q->queue[i];
switch (p->status) {
case DIFF_STATUS_DELETED:
case DIFF_STATUS_ADDED:
case DIFF_STATUS_COPIED:
case DIFF_STATUS_RENAMED:
return 0;
default:
if (p->score)
return 0;
if (p->one->mode && p->two->mode &&
p->one->mode != p->two->mode)
return 0;
break;
}
}
return 1;
}
void diff_flush(struct diff_options *options)
{
struct diff_queue_struct *q = &diff_queued_diff;
int i, output_format = options->output_format;
int separator = 0;
/*
* Order: raw, stat, summary, patch
* or: name/name-status/checkdiff (other bits clear)
*/
if (!q->nr)
goto free_queue;
if (output_format & (DIFF_FORMAT_RAW |
DIFF_FORMAT_NAME |
DIFF_FORMAT_NAME_STATUS |
DIFF_FORMAT_CHECKDIFF)) {
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
if (check_pair_status(p))
flush_one_pair(p, options);
}
separator++;
}
if (output_format & (DIFF_FORMAT_DIFFSTAT|DIFF_FORMAT_SHORTSTAT|DIFF_FORMAT_NUMSTAT)) {
struct diffstat_t diffstat;
memset(&diffstat, 0, sizeof(struct diffstat_t));
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
if (check_pair_status(p))
diff_flush_stat(p, options, &diffstat);
}
if (output_format & DIFF_FORMAT_NUMSTAT)
show_numstat(&diffstat, options);
if (output_format & DIFF_FORMAT_DIFFSTAT)
show_stats(&diffstat, options);
if (output_format & DIFF_FORMAT_SHORTSTAT)
show_shortstats(&diffstat, options);
free_diffstat_info(&diffstat);
separator++;
}
if (output_format & DIFF_FORMAT_DIRSTAT)
show_dirstat(options);
if (output_format & DIFF_FORMAT_SUMMARY && !is_summary_empty(q)) {
for (i = 0; i < q->nr; i++) {
diff_summary(options, q->queue[i]);
}
separator++;
}
if (output_format & DIFF_FORMAT_NO_OUTPUT &&
DIFF_OPT_TST(options, EXIT_WITH_STATUS) &&
DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
/*
* run diff_flush_patch for the exit status. setting
* options->file to /dev/null should be safe, becaue we
* aren't supposed to produce any output anyway.
*/
if (options->close_file)
fclose(options->file);
options->file = fopen("/dev/null", "w");
if (!options->file)
die_errno("Could not open /dev/null");
options->close_file = 1;
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
if (check_pair_status(p))
diff_flush_patch(p, options);
if (options->found_changes)
break;
}
}
if (output_format & DIFF_FORMAT_PATCH) {
if (separator) {
putc(options->line_termination, options->file);
if (options->stat_sep) {
/* attach patch instead of inline */
fputs(options->stat_sep, options->file);
}
}
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
if (check_pair_status(p))
diff_flush_patch(p, options);
}
}
if (output_format & DIFF_FORMAT_CALLBACK)
options->format_callback(q, options, options->format_callback_data);
for (i = 0; i < q->nr; i++)
diff_free_filepair(q->queue[i]);
free_queue:
free(q->queue);
DIFF_QUEUE_CLEAR(q);
if (options->close_file)
fclose(options->file);
/*
* Report the content-level differences with HAS_CHANGES;
* diff_addremove/diff_change does not set the bit when
* DIFF_FROM_CONTENTS is in effect (e.g. with -w).
*/
if (DIFF_OPT_TST(options, DIFF_FROM_CONTENTS)) {
if (options->found_changes)
DIFF_OPT_SET(options, HAS_CHANGES);
else
DIFF_OPT_CLR(options, HAS_CHANGES);
}
}
static void diffcore_apply_filter(const char *filter)
{
int i;
struct diff_queue_struct *q = &diff_queued_diff;
struct diff_queue_struct outq;
DIFF_QUEUE_CLEAR(&outq);
if (!filter)
return;
if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
int found;
for (i = found = 0; !found && i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
if (((p->status == DIFF_STATUS_MODIFIED) &&
((p->score &&
strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
(!p->score &&
strchr(filter, DIFF_STATUS_MODIFIED)))) ||
((p->status != DIFF_STATUS_MODIFIED) &&
strchr(filter, p->status)))
found++;
}
if (found)
return;
/* otherwise we will clear the whole queue
* by copying the empty outq at the end of this
* function, but first clear the current entries
* in the queue.
*/
for (i = 0; i < q->nr; i++)
diff_free_filepair(q->queue[i]);
}
else {
/* Only the matching ones */
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
if (((p->status == DIFF_STATUS_MODIFIED) &&
((p->score &&
strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
(!p->score &&
strchr(filter, DIFF_STATUS_MODIFIED)))) ||
((p->status != DIFF_STATUS_MODIFIED) &&
strchr(filter, p->status)))
diff_q(&outq, p);
else
diff_free_filepair(p);
}
}
free(q->queue);
*q = outq;
}
/* Check whether two filespecs with the same mode and size are identical */
static int diff_filespec_is_identical(struct diff_filespec *one,
struct diff_filespec *two)
{
if (S_ISGITLINK(one->mode))
return 0;
if (diff_populate_filespec(one, 0))
return 0;
if (diff_populate_filespec(two, 0))
return 0;
return !memcmp(one->data, two->data, one->size);
}
static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
{
int i;
struct diff_queue_struct *q = &diff_queued_diff;
struct diff_queue_struct outq;
DIFF_QUEUE_CLEAR(&outq);
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
/*
* 1. Entries that come from stat info dirtiness
* always have both sides (iow, not create/delete),
* one side of the object name is unknown, with
* the same mode and size. Keep the ones that
* do not match these criteria. They have real
* differences.
*
* 2. At this point, the file is known to be modified,
* with the same mode and size, and the object
* name of one side is unknown. Need to inspect
* the identical contents.
*/
if (!DIFF_FILE_VALID(p->one) || /* (1) */
!DIFF_FILE_VALID(p->two) ||
(p->one->sha1_valid && p->two->sha1_valid) ||
(p->one->mode != p->two->mode) ||
diff_populate_filespec(p->one, 1) ||
diff_populate_filespec(p->two, 1) ||
(p->one->size != p->two->size) ||
!diff_filespec_is_identical(p->one, p->two)) /* (2) */
diff_q(&outq, p);
else {
/*
* The caller can subtract 1 from skip_stat_unmatch
* to determine how many paths were dirty only
* due to stat info mismatch.
*/
if (!DIFF_OPT_TST(diffopt, NO_INDEX))
diffopt->skip_stat_unmatch++;
diff_free_filepair(p);
}
}
free(q->queue);
*q = outq;
}
static int diffnamecmp(const void *a_, const void *b_)
{
const struct diff_filepair *a = *((const struct diff_filepair **)a_);
const struct diff_filepair *b = *((const struct diff_filepair **)b_);
const char *name_a, *name_b;
name_a = a->one ? a->one->path : a->two->path;
name_b = b->one ? b->one->path : b->two->path;
return strcmp(name_a, name_b);
}
void diffcore_fix_diff_index(struct diff_options *options)
{
struct diff_queue_struct *q = &diff_queued_diff;
qsort(q->queue, q->nr, sizeof(q->queue[0]), diffnamecmp);
}
void diffcore_std(struct diff_options *options)
{
/* We never run this function more than one time, because the
* rename/copy detection logic can only run once.
*/
if (diff_queued_diff.run)
return;
if (options->skip_stat_unmatch)
diffcore_skip_stat_unmatch(options);
if (options->break_opt != -1)
diffcore_break(options->break_opt);
if (options->detect_rename)
diffcore_rename(options);
if (options->break_opt != -1)
diffcore_merge_broken();
if (options->pickaxe)
diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
if (options->orderfile)
diffcore_order(options->orderfile);
diff_resolve_rename_copy();
diffcore_apply_filter(options->filter);
if (diff_queued_diff.nr && !DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
DIFF_OPT_SET(options, HAS_CHANGES);
else
DIFF_OPT_CLR(options, HAS_CHANGES);
diff_queued_diff.run = 1;
}
int diff_result_code(struct diff_options *opt, int status)
{
int result = 0;
if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
!(opt->output_format & DIFF_FORMAT_CHECKDIFF))
return status;
if (DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
DIFF_OPT_TST(opt, HAS_CHANGES))
result |= 01;
if ((opt->output_format & DIFF_FORMAT_CHECKDIFF) &&
DIFF_OPT_TST(opt, CHECK_FAILED))
result |= 02;
return result;
}
void diff_addremove(struct diff_options *options,
int addremove, unsigned mode,
const unsigned char *sha1,
const char *concatpath, unsigned dirty_submodule)
{
struct diff_filespec *one, *two;
if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(mode))
return;
/* This may look odd, but it is a preparation for
* feeding "there are unchanged files which should
* not produce diffs, but when you are doing copy
* detection you would need them, so here they are"
* entries to the diff-core. They will be prefixed
* with something like '=' or '*' (I haven't decided
* which but should not make any difference).
* Feeding the same new and old to diff_change()
* also has the same effect.
* Before the final output happens, they are pruned after
* merged into rename/copy pairs as appropriate.
*/
if (DIFF_OPT_TST(options, REVERSE_DIFF))
addremove = (addremove == '+' ? '-' :
addremove == '-' ? '+' : addremove);
if (options->prefix &&
strncmp(concatpath, options->prefix, options->prefix_length))
return;
one = alloc_filespec(concatpath);
two = alloc_filespec(concatpath);
if (addremove != '+')
fill_filespec(one, sha1, mode);
if (addremove != '-') {
fill_filespec(two, sha1, mode);
two->dirty_submodule = dirty_submodule;
}
diff_queue(&diff_queued_diff, one, two);
if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
DIFF_OPT_SET(options, HAS_CHANGES);
}
void diff_change(struct diff_options *options,
unsigned old_mode, unsigned new_mode,
const unsigned char *old_sha1,
const unsigned char *new_sha1,
const char *concatpath,
unsigned old_dirty_submodule, unsigned new_dirty_submodule)
{
struct diff_filespec *one, *two;
if (DIFF_OPT_TST(options, IGNORE_SUBMODULES) && S_ISGITLINK(old_mode)
&& S_ISGITLINK(new_mode))
return;
if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
unsigned tmp;
const unsigned char *tmp_c;
tmp = old_mode; old_mode = new_mode; new_mode = tmp;
tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
tmp = old_dirty_submodule; old_dirty_submodule = new_dirty_submodule;
new_dirty_submodule = tmp;
}
if (options->prefix &&
strncmp(concatpath, options->prefix, options->prefix_length))
return;
one = alloc_filespec(concatpath);
two = alloc_filespec(concatpath);
fill_filespec(one, old_sha1, old_mode);
fill_filespec(two, new_sha1, new_mode);
one->dirty_submodule = old_dirty_submodule;
two->dirty_submodule = new_dirty_submodule;
diff_queue(&diff_queued_diff, one, two);
if (!DIFF_OPT_TST(options, DIFF_FROM_CONTENTS))
DIFF_OPT_SET(options, HAS_CHANGES);
}
void diff_unmerge(struct diff_options *options,
const char *path,
unsigned mode, const unsigned char *sha1)
{
struct diff_filespec *one, *two;
if (options->prefix &&
strncmp(path, options->prefix, options->prefix_length))
return;
one = alloc_filespec(path);
two = alloc_filespec(path);
fill_filespec(one, sha1, mode);
diff_queue(&diff_queued_diff, one, two)->is_unmerged = 1;
}
static char *run_textconv(const char *pgm, struct diff_filespec *spec,
size_t *outsize)
{
struct diff_tempfile *temp;
const char *argv[3];
const char **arg = argv;
struct child_process child;
struct strbuf buf = STRBUF_INIT;
int err = 0;
temp = prepare_temp_file(spec->path, spec);
*arg++ = pgm;
*arg++ = temp->name;
*arg = NULL;
memset(&child, 0, sizeof(child));
child.use_shell = 1;
child.argv = argv;
child.out = -1;
if (start_command(&child)) {
remove_tempfile();
return NULL;
}
if (strbuf_read(&buf, child.out, 0) < 0)
err = error("error reading from textconv command '%s'", pgm);
close(child.out);
if (finish_command(&child) || err) {
strbuf_release(&buf);
remove_tempfile();
return NULL;
}
remove_tempfile();
return strbuf_detach(&buf, outsize);
}
size_t fill_textconv(struct userdiff_driver *driver,
struct diff_filespec *df,
char **outbuf)
{
size_t size;
if (!driver || !driver->textconv) {
if (!DIFF_FILE_VALID(df)) {
*outbuf = "";
return 0;
}
if (diff_populate_filespec(df, 0))
die("unable to read files to diff");
*outbuf = df->data;
return df->size;
}
if (driver->textconv_cache) {
*outbuf = notes_cache_get(driver->textconv_cache, df->sha1,
&size);
if (*outbuf)
return size;
}
*outbuf = run_textconv(driver->textconv, df, &size);
if (!*outbuf)
die("unable to read files to diff");
if (driver->textconv_cache) {
/* ignore errors, as we might be in a readonly repository */
notes_cache_put(driver->textconv_cache, df->sha1, *outbuf,
size);
/*
* we could save up changes and flush them all at the end,
* but we would need an extra call after all diffing is done.
* Since generating a cache entry is the slow path anyway,
* this extra overhead probably isn't a big deal.
*/
notes_cache_write(driver->textconv_cache);
}
return size;
}