git/quote.c
Christian Couder 6ce4e61f1b Trace into a file or an open fd and refactor tracing code.
If GIT_TRACE is set to an absolute path (starting with a
'/' character), we interpret this as a file path and we
trace into it.

Also if GIT_TRACE is set to an integer value greater than
1 and lower than 10, we interpret this as an open fd value
and we trace into it.

Note that this behavior is not compatible with the
previous one.

We also trace whole messages using one write(2) call to
make sure messages from processes do net get mixed up in
the middle.

This patch makes it possible to get trace information when
running "make test".

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
2006-09-02 14:47:53 -07:00

323 lines
6.5 KiB
C

#include "cache.h"
#include "quote.h"
/* Help to copy the thing properly quoted for the shell safety.
* any single quote is replaced with '\'', any exclamation point
* is replaced with '\!', and the whole thing is enclosed in a
*
* E.g.
* original sq_quote result
* name ==> name ==> 'name'
* a b ==> a b ==> 'a b'
* a'b ==> a'\''b ==> 'a'\''b'
* a!b ==> a'\!'b ==> 'a'\!'b'
*/
#undef EMIT
#define EMIT(x) do { if (++len < n) *bp++ = (x); } while(0)
static inline int need_bs_quote(char c)
{
return (c == '\'' || c == '!');
}
size_t sq_quote_buf(char *dst, size_t n, const char *src)
{
char c;
char *bp = dst;
size_t len = 0;
EMIT('\'');
while ((c = *src++)) {
if (need_bs_quote(c)) {
EMIT('\'');
EMIT('\\');
EMIT(c);
EMIT('\'');
} else {
EMIT(c);
}
}
EMIT('\'');
if ( n )
*bp = 0;
return len;
}
void sq_quote_print(FILE *stream, const char *src)
{
char c;
fputc('\'', stream);
while ((c = *src++)) {
if (need_bs_quote(c)) {
fputs("'\\", stream);
fputc(c, stream);
fputc('\'', stream);
} else {
fputc(c, stream);
}
}
fputc('\'', stream);
}
char *sq_quote(const char *src)
{
char *buf;
size_t cnt;
cnt = sq_quote_buf(NULL, 0, src) + 1;
buf = xmalloc(cnt);
sq_quote_buf(buf, cnt, src);
return buf;
}
char *sq_quote_argv(const char** argv, int count)
{
char *buf, *to;
int i;
size_t len = 0;
/* Count argv if needed. */
if (count < 0) {
for (count = 0; argv[count]; count++)
; /* just counting */
}
/* Special case: no argv. */
if (!count)
return xcalloc(1,1);
/* Get destination buffer length. */
for (i = 0; i < count; i++)
len += sq_quote_buf(NULL, 0, argv[i]) + 1;
/* Alloc destination buffer. */
to = buf = xmalloc(len + 1);
/* Copy into destination buffer. */
for (i = 0; i < count; ++i) {
*to++ = ' ';
to += sq_quote_buf(to, len, argv[i]);
}
return buf;
}
char *sq_dequote(char *arg)
{
char *dst = arg;
char *src = arg;
char c;
if (*src != '\'')
return NULL;
for (;;) {
c = *++src;
if (!c)
return NULL;
if (c != '\'') {
*dst++ = c;
continue;
}
/* We stepped out of sq */
switch (*++src) {
case '\0':
*dst = 0;
return arg;
case '\\':
c = *++src;
if (need_bs_quote(c) && *++src == '\'') {
*dst++ = c;
continue;
}
/* Fallthrough */
default:
return NULL;
}
}
}
/*
* C-style name quoting.
*
* Does one of three things:
*
* (1) if outbuf and outfp are both NULL, inspect the input name and
* counts the number of bytes that are needed to hold c_style
* quoted version of name, counting the double quotes around
* it but not terminating NUL, and returns it. However, if name
* does not need c_style quoting, it returns 0.
*
* (2) if outbuf is not NULL, it must point at a buffer large enough
* to hold the c_style quoted version of name, enclosing double
* quotes, and terminating NUL. Fills outbuf with c_style quoted
* version of name enclosed in double-quote pair. Return value
* is undefined.
*
* (3) if outfp is not NULL, outputs c_style quoted version of name,
* but not enclosed in double-quote pair. Return value is undefined.
*/
static int quote_c_style_counted(const char *name, int namelen,
char *outbuf, FILE *outfp, int no_dq)
{
#undef EMIT
#define EMIT(c) \
(outbuf ? (*outbuf++ = (c)) : outfp ? fputc(c, outfp) : (count++))
#define EMITQ() EMIT('\\')
const char *sp;
int ch, count = 0, needquote = 0;
if (!no_dq)
EMIT('"');
for (sp = name; sp < name + namelen; sp++) {
ch = *sp;
if (!ch)
break;
if ((ch < ' ') || (ch == '"') || (ch == '\\') ||
(ch == 0177)) {
needquote = 1;
switch (ch) {
case '\a': EMITQ(); ch = 'a'; break;
case '\b': EMITQ(); ch = 'b'; break;
case '\f': EMITQ(); ch = 'f'; break;
case '\n': EMITQ(); ch = 'n'; break;
case '\r': EMITQ(); ch = 'r'; break;
case '\t': EMITQ(); ch = 't'; break;
case '\v': EMITQ(); ch = 'v'; break;
case '\\': /* fallthru */
case '"': EMITQ(); break;
default:
/* octal */
EMITQ();
EMIT(((ch >> 6) & 03) + '0');
EMIT(((ch >> 3) & 07) + '0');
ch = (ch & 07) + '0';
break;
}
}
EMIT(ch);
}
if (!no_dq)
EMIT('"');
if (outbuf)
*outbuf = 0;
return needquote ? count : 0;
}
int quote_c_style(const char *name, char *outbuf, FILE *outfp, int no_dq)
{
int cnt = strlen(name);
return quote_c_style_counted(name, cnt, outbuf, outfp, no_dq);
}
/*
* C-style name unquoting.
*
* Quoted should point at the opening double quote. Returns
* an allocated memory that holds unquoted name, which the caller
* should free when done. Updates endp pointer to point at
* one past the ending double quote if given.
*/
char *unquote_c_style(const char *quoted, const char **endp)
{
const char *sp;
char *name = NULL, *outp = NULL;
int count = 0, ch, ac;
#undef EMIT
#define EMIT(c) (outp ? (*outp++ = (c)) : (count++))
if (*quoted++ != '"')
return NULL;
while (1) {
/* first pass counts and allocates, second pass fills */
for (sp = quoted; (ch = *sp++) != '"'; ) {
if (ch == '\\') {
switch (ch = *sp++) {
case 'a': ch = '\a'; break;
case 'b': ch = '\b'; break;
case 'f': ch = '\f'; break;
case 'n': ch = '\n'; break;
case 'r': ch = '\r'; break;
case 't': ch = '\t'; break;
case 'v': ch = '\v'; break;
case '\\': case '"':
break; /* verbatim */
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
/* octal */
ac = ((ch - '0') << 6);
if ((ch = *sp++) < '0' || '7' < ch)
return NULL;
ac |= ((ch - '0') << 3);
if ((ch = *sp++) < '0' || '7' < ch)
return NULL;
ac |= (ch - '0');
ch = ac;
break;
default:
return NULL; /* malformed */
}
}
EMIT(ch);
}
if (name) {
*outp = 0;
if (endp)
*endp = sp;
return name;
}
outp = name = xmalloc(count + 1);
}
}
void write_name_quoted(const char *prefix, int prefix_len,
const char *name, int quote, FILE *out)
{
int needquote;
if (!quote) {
no_quote:
if (prefix_len)
fprintf(out, "%.*s", prefix_len, prefix);
fputs(name, out);
return;
}
needquote = 0;
if (prefix_len)
needquote = quote_c_style_counted(prefix, prefix_len,
NULL, NULL, 0);
if (!needquote)
needquote = quote_c_style(name, NULL, NULL, 0);
if (needquote) {
fputc('"', out);
if (prefix_len)
quote_c_style_counted(prefix, prefix_len,
NULL, out, 1);
quote_c_style(name, NULL, out, 1);
fputc('"', out);
}
else
goto no_quote;
}