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![Ben Peart](/assets/img/avatar_default.png)
To enable future reuse of the filter.<driver>.process infrastructure, split start_multi_file_filter() into two separate parts. start_multi_file_filter() will now only contain the generic logic to manage the creation and tracking of the child process in a hashmap. start_multi_file_filter_fn() is a protocol specific initialization function that will negotiate the multi-file-filter interface version and capabilities. Signed-off-by: Ben Peart <benpeart@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
1718 lines
40 KiB
C
1718 lines
40 KiB
C
#include "cache.h"
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#include "attr.h"
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#include "run-command.h"
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#include "quote.h"
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#include "sigchain.h"
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#include "pkt-line.h"
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/*
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* convert.c - convert a file when checking it out and checking it in.
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*
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* This should use the pathname to decide on whether it wants to do some
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* more interesting conversions (automatic gzip/unzip, general format
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* conversions etc etc), but by default it just does automatic CRLF<->LF
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* translation when the "text" attribute or "auto_crlf" option is set.
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*/
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/* Stat bits: When BIN is set, the txt bits are unset */
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#define CONVERT_STAT_BITS_TXT_LF 0x1
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#define CONVERT_STAT_BITS_TXT_CRLF 0x2
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#define CONVERT_STAT_BITS_BIN 0x4
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enum crlf_action {
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CRLF_UNDEFINED,
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CRLF_BINARY,
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CRLF_TEXT,
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CRLF_TEXT_INPUT,
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CRLF_TEXT_CRLF,
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CRLF_AUTO,
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CRLF_AUTO_INPUT,
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CRLF_AUTO_CRLF
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};
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struct text_stat {
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/* NUL, CR, LF and CRLF counts */
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unsigned nul, lonecr, lonelf, crlf;
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/* These are just approximations! */
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unsigned printable, nonprintable;
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};
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static void gather_stats(const char *buf, unsigned long size, struct text_stat *stats)
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{
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unsigned long i;
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memset(stats, 0, sizeof(*stats));
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for (i = 0; i < size; i++) {
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unsigned char c = buf[i];
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if (c == '\r') {
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if (i+1 < size && buf[i+1] == '\n') {
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stats->crlf++;
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i++;
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} else
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stats->lonecr++;
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continue;
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}
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if (c == '\n') {
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stats->lonelf++;
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continue;
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}
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if (c == 127)
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/* DEL */
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stats->nonprintable++;
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else if (c < 32) {
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switch (c) {
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/* BS, HT, ESC and FF */
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case '\b': case '\t': case '\033': case '\014':
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stats->printable++;
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break;
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case 0:
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stats->nul++;
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/* fall through */
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default:
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stats->nonprintable++;
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}
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}
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else
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stats->printable++;
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}
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/* If file ends with EOF then don't count this EOF as non-printable. */
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if (size >= 1 && buf[size-1] == '\032')
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stats->nonprintable--;
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}
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/*
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* The same heuristics as diff.c::mmfile_is_binary()
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* We treat files with bare CR as binary
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*/
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static int convert_is_binary(unsigned long size, const struct text_stat *stats)
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{
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if (stats->lonecr)
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return 1;
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if (stats->nul)
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return 1;
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if ((stats->printable >> 7) < stats->nonprintable)
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return 1;
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return 0;
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}
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static unsigned int gather_convert_stats(const char *data, unsigned long size)
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{
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struct text_stat stats;
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int ret = 0;
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if (!data || !size)
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return 0;
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gather_stats(data, size, &stats);
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if (convert_is_binary(size, &stats))
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ret |= CONVERT_STAT_BITS_BIN;
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if (stats.crlf)
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ret |= CONVERT_STAT_BITS_TXT_CRLF;
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if (stats.lonelf)
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ret |= CONVERT_STAT_BITS_TXT_LF;
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return ret;
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}
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static const char *gather_convert_stats_ascii(const char *data, unsigned long size)
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{
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unsigned int convert_stats = gather_convert_stats(data, size);
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if (convert_stats & CONVERT_STAT_BITS_BIN)
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return "-text";
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switch (convert_stats) {
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case CONVERT_STAT_BITS_TXT_LF:
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return "lf";
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case CONVERT_STAT_BITS_TXT_CRLF:
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return "crlf";
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case CONVERT_STAT_BITS_TXT_LF | CONVERT_STAT_BITS_TXT_CRLF:
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return "mixed";
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default:
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return "none";
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}
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}
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const char *get_cached_convert_stats_ascii(const char *path)
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{
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const char *ret;
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unsigned long sz;
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void *data = read_blob_data_from_cache(path, &sz);
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ret = gather_convert_stats_ascii(data, sz);
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free(data);
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return ret;
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}
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const char *get_wt_convert_stats_ascii(const char *path)
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{
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const char *ret = "";
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struct strbuf sb = STRBUF_INIT;
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if (strbuf_read_file(&sb, path, 0) >= 0)
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ret = gather_convert_stats_ascii(sb.buf, sb.len);
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strbuf_release(&sb);
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return ret;
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}
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static int text_eol_is_crlf(void)
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{
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if (auto_crlf == AUTO_CRLF_TRUE)
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return 1;
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else if (auto_crlf == AUTO_CRLF_INPUT)
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return 0;
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if (core_eol == EOL_CRLF)
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return 1;
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if (core_eol == EOL_UNSET && EOL_NATIVE == EOL_CRLF)
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return 1;
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return 0;
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}
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static enum eol output_eol(enum crlf_action crlf_action)
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{
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switch (crlf_action) {
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case CRLF_BINARY:
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return EOL_UNSET;
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case CRLF_TEXT_CRLF:
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return EOL_CRLF;
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case CRLF_TEXT_INPUT:
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return EOL_LF;
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case CRLF_UNDEFINED:
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case CRLF_AUTO_CRLF:
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return EOL_CRLF;
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case CRLF_AUTO_INPUT:
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return EOL_LF;
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case CRLF_TEXT:
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case CRLF_AUTO:
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/* fall through */
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return text_eol_is_crlf() ? EOL_CRLF : EOL_LF;
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}
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warning("Illegal crlf_action %d\n", (int)crlf_action);
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return core_eol;
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}
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static void check_safe_crlf(const char *path, enum crlf_action crlf_action,
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struct text_stat *old_stats, struct text_stat *new_stats,
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enum safe_crlf checksafe)
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{
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if (old_stats->crlf && !new_stats->crlf ) {
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/*
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* CRLFs would not be restored by checkout
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*/
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if (checksafe == SAFE_CRLF_WARN)
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warning(_("CRLF will be replaced by LF in %s.\n"
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"The file will have its original line"
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" endings in your working directory."), path);
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else /* i.e. SAFE_CRLF_FAIL */
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die(_("CRLF would be replaced by LF in %s."), path);
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} else if (old_stats->lonelf && !new_stats->lonelf ) {
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/*
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* CRLFs would be added by checkout
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*/
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if (checksafe == SAFE_CRLF_WARN)
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warning(_("LF will be replaced by CRLF in %s.\n"
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"The file will have its original line"
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" endings in your working directory."), path);
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else /* i.e. SAFE_CRLF_FAIL */
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die(_("LF would be replaced by CRLF in %s"), path);
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}
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}
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static int has_cr_in_index(const char *path)
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{
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unsigned long sz;
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void *data;
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int has_cr;
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data = read_blob_data_from_cache(path, &sz);
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if (!data)
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return 0;
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has_cr = memchr(data, '\r', sz) != NULL;
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free(data);
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return has_cr;
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}
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static int will_convert_lf_to_crlf(size_t len, struct text_stat *stats,
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enum crlf_action crlf_action)
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{
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if (output_eol(crlf_action) != EOL_CRLF)
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return 0;
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/* No "naked" LF? Nothing to convert, regardless. */
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if (!stats->lonelf)
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return 0;
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if (crlf_action == CRLF_AUTO || crlf_action == CRLF_AUTO_INPUT || crlf_action == CRLF_AUTO_CRLF) {
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/* If we have any CR or CRLF line endings, we do not touch it */
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/* This is the new safer autocrlf-handling */
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if (stats->lonecr || stats->crlf)
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return 0;
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if (convert_is_binary(len, stats))
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return 0;
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}
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return 1;
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}
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static int crlf_to_git(const char *path, const char *src, size_t len,
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struct strbuf *buf,
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enum crlf_action crlf_action, enum safe_crlf checksafe)
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{
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struct text_stat stats;
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char *dst;
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int convert_crlf_into_lf;
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if (crlf_action == CRLF_BINARY ||
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(src && !len))
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return 0;
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/*
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* If we are doing a dry-run and have no source buffer, there is
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* nothing to analyze; we must assume we would convert.
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*/
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if (!buf && !src)
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return 1;
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gather_stats(src, len, &stats);
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/* Optimization: No CRLF? Nothing to convert, regardless. */
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convert_crlf_into_lf = !!stats.crlf;
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if (crlf_action == CRLF_AUTO || crlf_action == CRLF_AUTO_INPUT || crlf_action == CRLF_AUTO_CRLF) {
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if (convert_is_binary(len, &stats))
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return 0;
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/*
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* If the file in the index has any CR in it, do not
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* convert. This is the new safer autocrlf handling,
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* unless we want to renormalize in a merge or
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* cherry-pick.
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*/
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if ((checksafe != SAFE_CRLF_RENORMALIZE) && has_cr_in_index(path))
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convert_crlf_into_lf = 0;
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}
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if ((checksafe == SAFE_CRLF_WARN ||
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(checksafe == SAFE_CRLF_FAIL)) && len) {
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struct text_stat new_stats;
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memcpy(&new_stats, &stats, sizeof(new_stats));
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/* simulate "git add" */
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if (convert_crlf_into_lf) {
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new_stats.lonelf += new_stats.crlf;
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new_stats.crlf = 0;
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}
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/* simulate "git checkout" */
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if (will_convert_lf_to_crlf(len, &new_stats, crlf_action)) {
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new_stats.crlf += new_stats.lonelf;
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new_stats.lonelf = 0;
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}
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check_safe_crlf(path, crlf_action, &stats, &new_stats, checksafe);
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}
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if (!convert_crlf_into_lf)
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return 0;
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/*
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* At this point all of our source analysis is done, and we are sure we
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* would convert. If we are in dry-run mode, we can give an answer.
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*/
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if (!buf)
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return 1;
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/* only grow if not in place */
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if (strbuf_avail(buf) + buf->len < len)
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strbuf_grow(buf, len - buf->len);
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dst = buf->buf;
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if (crlf_action == CRLF_AUTO || crlf_action == CRLF_AUTO_INPUT || crlf_action == CRLF_AUTO_CRLF) {
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/*
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* If we guessed, we already know we rejected a file with
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* lone CR, and we can strip a CR without looking at what
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* follow it.
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*/
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do {
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unsigned char c = *src++;
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if (c != '\r')
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*dst++ = c;
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} while (--len);
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} else {
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do {
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unsigned char c = *src++;
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if (! (c == '\r' && (1 < len && *src == '\n')))
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*dst++ = c;
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} while (--len);
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}
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strbuf_setlen(buf, dst - buf->buf);
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return 1;
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}
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static int crlf_to_worktree(const char *path, const char *src, size_t len,
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struct strbuf *buf, enum crlf_action crlf_action)
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{
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char *to_free = NULL;
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struct text_stat stats;
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if (!len || output_eol(crlf_action) != EOL_CRLF)
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return 0;
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gather_stats(src, len, &stats);
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if (!will_convert_lf_to_crlf(len, &stats, crlf_action))
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return 0;
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/* are we "faking" in place editing ? */
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if (src == buf->buf)
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to_free = strbuf_detach(buf, NULL);
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strbuf_grow(buf, len + stats.lonelf);
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for (;;) {
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const char *nl = memchr(src, '\n', len);
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if (!nl)
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break;
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if (nl > src && nl[-1] == '\r') {
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strbuf_add(buf, src, nl + 1 - src);
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} else {
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strbuf_add(buf, src, nl - src);
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strbuf_addstr(buf, "\r\n");
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}
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len -= nl + 1 - src;
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src = nl + 1;
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}
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strbuf_add(buf, src, len);
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free(to_free);
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return 1;
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}
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struct filter_params {
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const char *src;
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unsigned long size;
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int fd;
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const char *cmd;
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const char *path;
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};
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static int filter_buffer_or_fd(int in, int out, void *data)
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{
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/*
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* Spawn cmd and feed the buffer contents through its stdin.
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*/
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struct child_process child_process = CHILD_PROCESS_INIT;
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struct filter_params *params = (struct filter_params *)data;
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int write_err, status;
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const char *argv[] = { NULL, NULL };
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/* apply % substitution to cmd */
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struct strbuf cmd = STRBUF_INIT;
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struct strbuf path = STRBUF_INIT;
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struct strbuf_expand_dict_entry dict[] = {
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{ "f", NULL, },
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{ NULL, NULL, },
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};
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/* quote the path to preserve spaces, etc. */
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sq_quote_buf(&path, params->path);
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dict[0].value = path.buf;
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/* expand all %f with the quoted path */
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strbuf_expand(&cmd, params->cmd, strbuf_expand_dict_cb, &dict);
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strbuf_release(&path);
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argv[0] = cmd.buf;
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child_process.argv = argv;
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child_process.use_shell = 1;
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child_process.in = -1;
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child_process.out = out;
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if (start_command(&child_process))
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return error("cannot fork to run external filter '%s'", params->cmd);
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sigchain_push(SIGPIPE, SIG_IGN);
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if (params->src) {
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write_err = (write_in_full(child_process.in,
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params->src, params->size) < 0);
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if (errno == EPIPE)
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write_err = 0;
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} else {
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write_err = copy_fd(params->fd, child_process.in);
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if (write_err == COPY_WRITE_ERROR && errno == EPIPE)
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write_err = 0;
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}
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if (close(child_process.in))
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write_err = 1;
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if (write_err)
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error("cannot feed the input to external filter '%s'", params->cmd);
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sigchain_pop(SIGPIPE);
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status = finish_command(&child_process);
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if (status)
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error("external filter '%s' failed %d", params->cmd, status);
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strbuf_release(&cmd);
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return (write_err || status);
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}
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static int apply_single_file_filter(const char *path, const char *src, size_t len, int fd,
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struct strbuf *dst, const char *cmd)
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{
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/*
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* Create a pipeline to have the command filter the buffer's
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* contents.
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*
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* (child --> cmd) --> us
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*/
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int err = 0;
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struct strbuf nbuf = STRBUF_INIT;
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struct async async;
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struct filter_params params;
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memset(&async, 0, sizeof(async));
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async.proc = filter_buffer_or_fd;
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async.data = ¶ms;
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async.out = -1;
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params.src = src;
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params.size = len;
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params.fd = fd;
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params.cmd = cmd;
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params.path = path;
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fflush(NULL);
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if (start_async(&async))
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return 0; /* error was already reported */
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if (strbuf_read(&nbuf, async.out, len) < 0) {
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err = error("read from external filter '%s' failed", cmd);
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}
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if (close(async.out)) {
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err = error("read from external filter '%s' failed", cmd);
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}
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if (finish_async(&async)) {
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err = error("external filter '%s' failed", cmd);
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}
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if (!err) {
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strbuf_swap(dst, &nbuf);
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}
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strbuf_release(&nbuf);
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return !err;
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}
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#define CAP_CLEAN (1u<<0)
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#define CAP_SMUDGE (1u<<1)
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struct cmd2process {
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struct hashmap_entry ent; /* must be the first member! */
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unsigned int supported_capabilities;
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const char *cmd;
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struct child_process process;
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};
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static int cmd_process_map_initialized;
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static struct hashmap cmd_process_map;
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static int cmd2process_cmp(const struct cmd2process *e1,
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const struct cmd2process *e2,
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const void *unused)
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{
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return strcmp(e1->cmd, e2->cmd);
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}
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static struct cmd2process *find_multi_file_filter_entry(struct hashmap *hashmap, const char *cmd)
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{
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struct cmd2process key;
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hashmap_entry_init(&key, strhash(cmd));
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|
key.cmd = cmd;
|
|
return hashmap_get(hashmap, &key, NULL);
|
|
}
|
|
|
|
static void read_multi_file_filter_status(int fd, struct strbuf *status)
|
|
{
|
|
struct strbuf **pair;
|
|
char *line;
|
|
for (;;) {
|
|
line = packet_read_line(fd, NULL);
|
|
if (!line)
|
|
break;
|
|
pair = strbuf_split_str(line, '=', 2);
|
|
if (pair[0] && pair[0]->len && pair[1]) {
|
|
/* the last "status=<foo>" line wins */
|
|
if (!strcmp(pair[0]->buf, "status=")) {
|
|
strbuf_reset(status);
|
|
strbuf_addbuf(status, pair[1]);
|
|
}
|
|
}
|
|
strbuf_list_free(pair);
|
|
}
|
|
}
|
|
|
|
static void kill_multi_file_filter(struct hashmap *hashmap, struct cmd2process *entry)
|
|
{
|
|
if (!entry)
|
|
return;
|
|
|
|
entry->process.clean_on_exit = 0;
|
|
kill(entry->process.pid, SIGTERM);
|
|
finish_command(&entry->process);
|
|
|
|
hashmap_remove(hashmap, entry, NULL);
|
|
free(entry);
|
|
}
|
|
|
|
static void stop_multi_file_filter(struct child_process *process)
|
|
{
|
|
sigchain_push(SIGPIPE, SIG_IGN);
|
|
/* Closing the pipe signals the filter to initiate a shutdown. */
|
|
close(process->in);
|
|
close(process->out);
|
|
sigchain_pop(SIGPIPE);
|
|
/* Finish command will wait until the shutdown is complete. */
|
|
finish_command(process);
|
|
}
|
|
|
|
static int start_multi_file_filter_fn(struct cmd2process *entry)
|
|
{
|
|
int err;
|
|
struct string_list cap_list = STRING_LIST_INIT_NODUP;
|
|
char *cap_buf;
|
|
const char *cap_name;
|
|
struct child_process *process = &entry->process;
|
|
const char *cmd = entry->cmd;
|
|
|
|
sigchain_push(SIGPIPE, SIG_IGN);
|
|
|
|
err = packet_writel(process->in, "git-filter-client", "version=2", NULL);
|
|
if (err)
|
|
goto done;
|
|
|
|
err = strcmp(packet_read_line(process->out, NULL), "git-filter-server");
|
|
if (err) {
|
|
error("external filter '%s' does not support filter protocol version 2", cmd);
|
|
goto done;
|
|
}
|
|
err = strcmp(packet_read_line(process->out, NULL), "version=2");
|
|
if (err)
|
|
goto done;
|
|
err = packet_read_line(process->out, NULL) != NULL;
|
|
if (err)
|
|
goto done;
|
|
|
|
err = packet_writel(process->in, "capability=clean", "capability=smudge", NULL);
|
|
|
|
for (;;) {
|
|
cap_buf = packet_read_line(process->out, NULL);
|
|
if (!cap_buf)
|
|
break;
|
|
string_list_split_in_place(&cap_list, cap_buf, '=', 1);
|
|
|
|
if (cap_list.nr != 2 || strcmp(cap_list.items[0].string, "capability"))
|
|
continue;
|
|
|
|
cap_name = cap_list.items[1].string;
|
|
if (!strcmp(cap_name, "clean")) {
|
|
entry->supported_capabilities |= CAP_CLEAN;
|
|
} else if (!strcmp(cap_name, "smudge")) {
|
|
entry->supported_capabilities |= CAP_SMUDGE;
|
|
} else {
|
|
warning(
|
|
"external filter '%s' requested unsupported filter capability '%s'",
|
|
cmd, cap_name
|
|
);
|
|
}
|
|
|
|
string_list_clear(&cap_list, 0);
|
|
}
|
|
|
|
done:
|
|
sigchain_pop(SIGPIPE);
|
|
|
|
return err;
|
|
}
|
|
|
|
static struct cmd2process *start_multi_file_filter(struct hashmap *hashmap, const char *cmd)
|
|
{
|
|
int err;
|
|
struct cmd2process *entry;
|
|
struct child_process *process;
|
|
const char *argv[] = { cmd, NULL };
|
|
|
|
entry = xmalloc(sizeof(*entry));
|
|
entry->cmd = cmd;
|
|
entry->supported_capabilities = 0;
|
|
process = &entry->process;
|
|
|
|
child_process_init(process);
|
|
process->argv = argv;
|
|
process->use_shell = 1;
|
|
process->in = -1;
|
|
process->out = -1;
|
|
process->clean_on_exit = 1;
|
|
process->clean_on_exit_handler = stop_multi_file_filter;
|
|
|
|
if (start_command(process)) {
|
|
error("cannot fork to run external filter '%s'", cmd);
|
|
return NULL;
|
|
}
|
|
|
|
hashmap_entry_init(entry, strhash(cmd));
|
|
|
|
err = start_multi_file_filter_fn(entry);
|
|
if (err) {
|
|
error("initialization for external filter '%s' failed", cmd);
|
|
kill_multi_file_filter(hashmap, entry);
|
|
return NULL;
|
|
}
|
|
|
|
hashmap_add(hashmap, entry);
|
|
return entry;
|
|
}
|
|
|
|
static int apply_multi_file_filter(const char *path, const char *src, size_t len,
|
|
int fd, struct strbuf *dst, const char *cmd,
|
|
const unsigned int wanted_capability)
|
|
{
|
|
int err;
|
|
struct cmd2process *entry;
|
|
struct child_process *process;
|
|
struct strbuf nbuf = STRBUF_INIT;
|
|
struct strbuf filter_status = STRBUF_INIT;
|
|
const char *filter_type;
|
|
|
|
if (!cmd_process_map_initialized) {
|
|
cmd_process_map_initialized = 1;
|
|
hashmap_init(&cmd_process_map, (hashmap_cmp_fn) cmd2process_cmp, 0);
|
|
entry = NULL;
|
|
} else {
|
|
entry = find_multi_file_filter_entry(&cmd_process_map, cmd);
|
|
}
|
|
|
|
fflush(NULL);
|
|
|
|
if (!entry) {
|
|
entry = start_multi_file_filter(&cmd_process_map, cmd);
|
|
if (!entry)
|
|
return 0;
|
|
}
|
|
process = &entry->process;
|
|
|
|
if (!(wanted_capability & entry->supported_capabilities))
|
|
return 0;
|
|
|
|
if (CAP_CLEAN & wanted_capability)
|
|
filter_type = "clean";
|
|
else if (CAP_SMUDGE & wanted_capability)
|
|
filter_type = "smudge";
|
|
else
|
|
die("unexpected filter type");
|
|
|
|
sigchain_push(SIGPIPE, SIG_IGN);
|
|
|
|
assert(strlen(filter_type) < LARGE_PACKET_DATA_MAX - strlen("command=\n"));
|
|
err = packet_write_fmt_gently(process->in, "command=%s\n", filter_type);
|
|
if (err)
|
|
goto done;
|
|
|
|
err = strlen(path) > LARGE_PACKET_DATA_MAX - strlen("pathname=\n");
|
|
if (err) {
|
|
error("path name too long for external filter");
|
|
goto done;
|
|
}
|
|
|
|
err = packet_write_fmt_gently(process->in, "pathname=%s\n", path);
|
|
if (err)
|
|
goto done;
|
|
|
|
err = packet_flush_gently(process->in);
|
|
if (err)
|
|
goto done;
|
|
|
|
if (fd >= 0)
|
|
err = write_packetized_from_fd(fd, process->in);
|
|
else
|
|
err = write_packetized_from_buf(src, len, process->in);
|
|
if (err)
|
|
goto done;
|
|
|
|
read_multi_file_filter_status(process->out, &filter_status);
|
|
err = strcmp(filter_status.buf, "success");
|
|
if (err)
|
|
goto done;
|
|
|
|
err = read_packetized_to_strbuf(process->out, &nbuf) < 0;
|
|
if (err)
|
|
goto done;
|
|
|
|
read_multi_file_filter_status(process->out, &filter_status);
|
|
err = strcmp(filter_status.buf, "success");
|
|
|
|
done:
|
|
sigchain_pop(SIGPIPE);
|
|
|
|
if (err) {
|
|
if (!strcmp(filter_status.buf, "error")) {
|
|
/* The filter signaled a problem with the file. */
|
|
} else if (!strcmp(filter_status.buf, "abort")) {
|
|
/*
|
|
* The filter signaled a permanent problem. Don't try to filter
|
|
* files with the same command for the lifetime of the current
|
|
* Git process.
|
|
*/
|
|
entry->supported_capabilities &= ~wanted_capability;
|
|
} else {
|
|
/*
|
|
* Something went wrong with the protocol filter.
|
|
* Force shutdown and restart if another blob requires filtering.
|
|
*/
|
|
error("external filter '%s' failed", cmd);
|
|
kill_multi_file_filter(&cmd_process_map, entry);
|
|
}
|
|
} else {
|
|
strbuf_swap(dst, &nbuf);
|
|
}
|
|
strbuf_release(&nbuf);
|
|
return !err;
|
|
}
|
|
|
|
static struct convert_driver {
|
|
const char *name;
|
|
struct convert_driver *next;
|
|
const char *smudge;
|
|
const char *clean;
|
|
const char *process;
|
|
int required;
|
|
} *user_convert, **user_convert_tail;
|
|
|
|
static int apply_filter(const char *path, const char *src, size_t len,
|
|
int fd, struct strbuf *dst, struct convert_driver *drv,
|
|
const unsigned int wanted_capability)
|
|
{
|
|
const char *cmd = NULL;
|
|
|
|
if (!drv)
|
|
return 0;
|
|
|
|
if (!dst)
|
|
return 1;
|
|
|
|
if ((CAP_CLEAN & wanted_capability) && !drv->process && drv->clean)
|
|
cmd = drv->clean;
|
|
else if ((CAP_SMUDGE & wanted_capability) && !drv->process && drv->smudge)
|
|
cmd = drv->smudge;
|
|
|
|
if (cmd && *cmd)
|
|
return apply_single_file_filter(path, src, len, fd, dst, cmd);
|
|
else if (drv->process && *drv->process)
|
|
return apply_multi_file_filter(path, src, len, fd, dst, drv->process, wanted_capability);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int read_convert_config(const char *var, const char *value, void *cb)
|
|
{
|
|
const char *key, *name;
|
|
int namelen;
|
|
struct convert_driver *drv;
|
|
|
|
/*
|
|
* External conversion drivers are configured using
|
|
* "filter.<name>.variable".
|
|
*/
|
|
if (parse_config_key(var, "filter", &name, &namelen, &key) < 0 || !name)
|
|
return 0;
|
|
for (drv = user_convert; drv; drv = drv->next)
|
|
if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
|
|
break;
|
|
if (!drv) {
|
|
drv = xcalloc(1, sizeof(struct convert_driver));
|
|
drv->name = xmemdupz(name, namelen);
|
|
*user_convert_tail = drv;
|
|
user_convert_tail = &(drv->next);
|
|
}
|
|
|
|
/*
|
|
* filter.<name>.smudge and filter.<name>.clean specifies
|
|
* the command line:
|
|
*
|
|
* command-line
|
|
*
|
|
* The command-line will not be interpolated in any way.
|
|
*/
|
|
|
|
if (!strcmp("smudge", key))
|
|
return git_config_string(&drv->smudge, var, value);
|
|
|
|
if (!strcmp("clean", key))
|
|
return git_config_string(&drv->clean, var, value);
|
|
|
|
if (!strcmp("process", key))
|
|
return git_config_string(&drv->process, var, value);
|
|
|
|
if (!strcmp("required", key)) {
|
|
drv->required = git_config_bool(var, value);
|
|
return 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int count_ident(const char *cp, unsigned long size)
|
|
{
|
|
/*
|
|
* "$Id: 0000000000000000000000000000000000000000 $" <=> "$Id$"
|
|
*/
|
|
int cnt = 0;
|
|
char ch;
|
|
|
|
while (size) {
|
|
ch = *cp++;
|
|
size--;
|
|
if (ch != '$')
|
|
continue;
|
|
if (size < 3)
|
|
break;
|
|
if (memcmp("Id", cp, 2))
|
|
continue;
|
|
ch = cp[2];
|
|
cp += 3;
|
|
size -= 3;
|
|
if (ch == '$')
|
|
cnt++; /* $Id$ */
|
|
if (ch != ':')
|
|
continue;
|
|
|
|
/*
|
|
* "$Id: ... "; scan up to the closing dollar sign and discard.
|
|
*/
|
|
while (size) {
|
|
ch = *cp++;
|
|
size--;
|
|
if (ch == '$') {
|
|
cnt++;
|
|
break;
|
|
}
|
|
if (ch == '\n')
|
|
break;
|
|
}
|
|
}
|
|
return cnt;
|
|
}
|
|
|
|
static int ident_to_git(const char *path, const char *src, size_t len,
|
|
struct strbuf *buf, int ident)
|
|
{
|
|
char *dst, *dollar;
|
|
|
|
if (!ident || (src && !count_ident(src, len)))
|
|
return 0;
|
|
|
|
if (!buf)
|
|
return 1;
|
|
|
|
/* only grow if not in place */
|
|
if (strbuf_avail(buf) + buf->len < len)
|
|
strbuf_grow(buf, len - buf->len);
|
|
dst = buf->buf;
|
|
for (;;) {
|
|
dollar = memchr(src, '$', len);
|
|
if (!dollar)
|
|
break;
|
|
memmove(dst, src, dollar + 1 - src);
|
|
dst += dollar + 1 - src;
|
|
len -= dollar + 1 - src;
|
|
src = dollar + 1;
|
|
|
|
if (len > 3 && !memcmp(src, "Id:", 3)) {
|
|
dollar = memchr(src + 3, '$', len - 3);
|
|
if (!dollar)
|
|
break;
|
|
if (memchr(src + 3, '\n', dollar - src - 3)) {
|
|
/* Line break before the next dollar. */
|
|
continue;
|
|
}
|
|
|
|
memcpy(dst, "Id$", 3);
|
|
dst += 3;
|
|
len -= dollar + 1 - src;
|
|
src = dollar + 1;
|
|
}
|
|
}
|
|
memmove(dst, src, len);
|
|
strbuf_setlen(buf, dst + len - buf->buf);
|
|
return 1;
|
|
}
|
|
|
|
static int ident_to_worktree(const char *path, const char *src, size_t len,
|
|
struct strbuf *buf, int ident)
|
|
{
|
|
unsigned char sha1[20];
|
|
char *to_free = NULL, *dollar, *spc;
|
|
int cnt;
|
|
|
|
if (!ident)
|
|
return 0;
|
|
|
|
cnt = count_ident(src, len);
|
|
if (!cnt)
|
|
return 0;
|
|
|
|
/* are we "faking" in place editing ? */
|
|
if (src == buf->buf)
|
|
to_free = strbuf_detach(buf, NULL);
|
|
hash_sha1_file(src, len, "blob", sha1);
|
|
|
|
strbuf_grow(buf, len + cnt * 43);
|
|
for (;;) {
|
|
/* step 1: run to the next '$' */
|
|
dollar = memchr(src, '$', len);
|
|
if (!dollar)
|
|
break;
|
|
strbuf_add(buf, src, dollar + 1 - src);
|
|
len -= dollar + 1 - src;
|
|
src = dollar + 1;
|
|
|
|
/* step 2: does it looks like a bit like Id:xxx$ or Id$ ? */
|
|
if (len < 3 || memcmp("Id", src, 2))
|
|
continue;
|
|
|
|
/* step 3: skip over Id$ or Id:xxxxx$ */
|
|
if (src[2] == '$') {
|
|
src += 3;
|
|
len -= 3;
|
|
} else if (src[2] == ':') {
|
|
/*
|
|
* It's possible that an expanded Id has crept its way into the
|
|
* repository, we cope with that by stripping the expansion out.
|
|
* This is probably not a good idea, since it will cause changes
|
|
* on checkout, which won't go away by stash, but let's keep it
|
|
* for git-style ids.
|
|
*/
|
|
dollar = memchr(src + 3, '$', len - 3);
|
|
if (!dollar) {
|
|
/* incomplete keyword, no more '$', so just quit the loop */
|
|
break;
|
|
}
|
|
|
|
if (memchr(src + 3, '\n', dollar - src - 3)) {
|
|
/* Line break before the next dollar. */
|
|
continue;
|
|
}
|
|
|
|
spc = memchr(src + 4, ' ', dollar - src - 4);
|
|
if (spc && spc < dollar-1) {
|
|
/* There are spaces in unexpected places.
|
|
* This is probably an id from some other
|
|
* versioning system. Keep it for now.
|
|
*/
|
|
continue;
|
|
}
|
|
|
|
len -= dollar + 1 - src;
|
|
src = dollar + 1;
|
|
} else {
|
|
/* it wasn't a "Id$" or "Id:xxxx$" */
|
|
continue;
|
|
}
|
|
|
|
/* step 4: substitute */
|
|
strbuf_addstr(buf, "Id: ");
|
|
strbuf_add(buf, sha1_to_hex(sha1), 40);
|
|
strbuf_addstr(buf, " $");
|
|
}
|
|
strbuf_add(buf, src, len);
|
|
|
|
free(to_free);
|
|
return 1;
|
|
}
|
|
|
|
static enum crlf_action git_path_check_crlf(struct attr_check_item *check)
|
|
{
|
|
const char *value = check->value;
|
|
|
|
if (ATTR_TRUE(value))
|
|
return CRLF_TEXT;
|
|
else if (ATTR_FALSE(value))
|
|
return CRLF_BINARY;
|
|
else if (ATTR_UNSET(value))
|
|
;
|
|
else if (!strcmp(value, "input"))
|
|
return CRLF_TEXT_INPUT;
|
|
else if (!strcmp(value, "auto"))
|
|
return CRLF_AUTO;
|
|
return CRLF_UNDEFINED;
|
|
}
|
|
|
|
static enum eol git_path_check_eol(struct attr_check_item *check)
|
|
{
|
|
const char *value = check->value;
|
|
|
|
if (ATTR_UNSET(value))
|
|
;
|
|
else if (!strcmp(value, "lf"))
|
|
return EOL_LF;
|
|
else if (!strcmp(value, "crlf"))
|
|
return EOL_CRLF;
|
|
return EOL_UNSET;
|
|
}
|
|
|
|
static struct convert_driver *git_path_check_convert(struct attr_check_item *check)
|
|
{
|
|
const char *value = check->value;
|
|
struct convert_driver *drv;
|
|
|
|
if (ATTR_TRUE(value) || ATTR_FALSE(value) || ATTR_UNSET(value))
|
|
return NULL;
|
|
for (drv = user_convert; drv; drv = drv->next)
|
|
if (!strcmp(value, drv->name))
|
|
return drv;
|
|
return NULL;
|
|
}
|
|
|
|
static int git_path_check_ident(struct attr_check_item *check)
|
|
{
|
|
const char *value = check->value;
|
|
|
|
return !!ATTR_TRUE(value);
|
|
}
|
|
|
|
struct conv_attrs {
|
|
struct convert_driver *drv;
|
|
enum crlf_action attr_action; /* What attr says */
|
|
enum crlf_action crlf_action; /* When no attr is set, use core.autocrlf */
|
|
int ident;
|
|
};
|
|
|
|
static void convert_attrs(struct conv_attrs *ca, const char *path)
|
|
{
|
|
static struct attr_check *check;
|
|
|
|
if (!check) {
|
|
check = attr_check_initl("crlf", "ident", "filter",
|
|
"eol", "text", NULL);
|
|
user_convert_tail = &user_convert;
|
|
git_config(read_convert_config, NULL);
|
|
}
|
|
|
|
if (!git_check_attr(path, check)) {
|
|
struct attr_check_item *ccheck = check->items;
|
|
ca->crlf_action = git_path_check_crlf(ccheck + 4);
|
|
if (ca->crlf_action == CRLF_UNDEFINED)
|
|
ca->crlf_action = git_path_check_crlf(ccheck + 0);
|
|
ca->attr_action = ca->crlf_action;
|
|
ca->ident = git_path_check_ident(ccheck + 1);
|
|
ca->drv = git_path_check_convert(ccheck + 2);
|
|
if (ca->crlf_action != CRLF_BINARY) {
|
|
enum eol eol_attr = git_path_check_eol(ccheck + 3);
|
|
if (ca->crlf_action == CRLF_AUTO && eol_attr == EOL_LF)
|
|
ca->crlf_action = CRLF_AUTO_INPUT;
|
|
else if (ca->crlf_action == CRLF_AUTO && eol_attr == EOL_CRLF)
|
|
ca->crlf_action = CRLF_AUTO_CRLF;
|
|
else if (eol_attr == EOL_LF)
|
|
ca->crlf_action = CRLF_TEXT_INPUT;
|
|
else if (eol_attr == EOL_CRLF)
|
|
ca->crlf_action = CRLF_TEXT_CRLF;
|
|
}
|
|
ca->attr_action = ca->crlf_action;
|
|
} else {
|
|
ca->drv = NULL;
|
|
ca->crlf_action = CRLF_UNDEFINED;
|
|
ca->ident = 0;
|
|
}
|
|
if (ca->crlf_action == CRLF_TEXT)
|
|
ca->crlf_action = text_eol_is_crlf() ? CRLF_TEXT_CRLF : CRLF_TEXT_INPUT;
|
|
if (ca->crlf_action == CRLF_UNDEFINED && auto_crlf == AUTO_CRLF_FALSE)
|
|
ca->crlf_action = CRLF_BINARY;
|
|
if (ca->crlf_action == CRLF_UNDEFINED && auto_crlf == AUTO_CRLF_TRUE)
|
|
ca->crlf_action = CRLF_AUTO_CRLF;
|
|
if (ca->crlf_action == CRLF_UNDEFINED && auto_crlf == AUTO_CRLF_INPUT)
|
|
ca->crlf_action = CRLF_AUTO_INPUT;
|
|
}
|
|
|
|
int would_convert_to_git_filter_fd(const char *path)
|
|
{
|
|
struct conv_attrs ca;
|
|
|
|
convert_attrs(&ca, path);
|
|
if (!ca.drv)
|
|
return 0;
|
|
|
|
/*
|
|
* Apply a filter to an fd only if the filter is required to succeed.
|
|
* We must die if the filter fails, because the original data before
|
|
* filtering is not available.
|
|
*/
|
|
if (!ca.drv->required)
|
|
return 0;
|
|
|
|
return apply_filter(path, NULL, 0, -1, NULL, ca.drv, CAP_CLEAN);
|
|
}
|
|
|
|
const char *get_convert_attr_ascii(const char *path)
|
|
{
|
|
struct conv_attrs ca;
|
|
|
|
convert_attrs(&ca, path);
|
|
switch (ca.attr_action) {
|
|
case CRLF_UNDEFINED:
|
|
return "";
|
|
case CRLF_BINARY:
|
|
return "-text";
|
|
case CRLF_TEXT:
|
|
return "text";
|
|
case CRLF_TEXT_INPUT:
|
|
return "text eol=lf";
|
|
case CRLF_TEXT_CRLF:
|
|
return "text eol=crlf";
|
|
case CRLF_AUTO:
|
|
return "text=auto";
|
|
case CRLF_AUTO_CRLF:
|
|
return "text=auto eol=crlf";
|
|
case CRLF_AUTO_INPUT:
|
|
return "text=auto eol=lf";
|
|
}
|
|
return "";
|
|
}
|
|
|
|
int convert_to_git(const char *path, const char *src, size_t len,
|
|
struct strbuf *dst, enum safe_crlf checksafe)
|
|
{
|
|
int ret = 0;
|
|
struct conv_attrs ca;
|
|
|
|
convert_attrs(&ca, path);
|
|
|
|
ret |= apply_filter(path, src, len, -1, dst, ca.drv, CAP_CLEAN);
|
|
if (!ret && ca.drv && ca.drv->required)
|
|
die("%s: clean filter '%s' failed", path, ca.drv->name);
|
|
|
|
if (ret && dst) {
|
|
src = dst->buf;
|
|
len = dst->len;
|
|
}
|
|
ret |= crlf_to_git(path, src, len, dst, ca.crlf_action, checksafe);
|
|
if (ret && dst) {
|
|
src = dst->buf;
|
|
len = dst->len;
|
|
}
|
|
return ret | ident_to_git(path, src, len, dst, ca.ident);
|
|
}
|
|
|
|
void convert_to_git_filter_fd(const char *path, int fd, struct strbuf *dst,
|
|
enum safe_crlf checksafe)
|
|
{
|
|
struct conv_attrs ca;
|
|
convert_attrs(&ca, path);
|
|
|
|
assert(ca.drv);
|
|
assert(ca.drv->clean || ca.drv->process);
|
|
|
|
if (!apply_filter(path, NULL, 0, fd, dst, ca.drv, CAP_CLEAN))
|
|
die("%s: clean filter '%s' failed", path, ca.drv->name);
|
|
|
|
crlf_to_git(path, dst->buf, dst->len, dst, ca.crlf_action, checksafe);
|
|
ident_to_git(path, dst->buf, dst->len, dst, ca.ident);
|
|
}
|
|
|
|
static int convert_to_working_tree_internal(const char *path, const char *src,
|
|
size_t len, struct strbuf *dst,
|
|
int normalizing)
|
|
{
|
|
int ret = 0, ret_filter = 0;
|
|
struct conv_attrs ca;
|
|
|
|
convert_attrs(&ca, path);
|
|
|
|
ret |= ident_to_worktree(path, src, len, dst, ca.ident);
|
|
if (ret) {
|
|
src = dst->buf;
|
|
len = dst->len;
|
|
}
|
|
/*
|
|
* CRLF conversion can be skipped if normalizing, unless there
|
|
* is a smudge or process filter (even if the process filter doesn't
|
|
* support smudge). The filters might expect CRLFs.
|
|
*/
|
|
if ((ca.drv && (ca.drv->smudge || ca.drv->process)) || !normalizing) {
|
|
ret |= crlf_to_worktree(path, src, len, dst, ca.crlf_action);
|
|
if (ret) {
|
|
src = dst->buf;
|
|
len = dst->len;
|
|
}
|
|
}
|
|
|
|
ret_filter = apply_filter(path, src, len, -1, dst, ca.drv, CAP_SMUDGE);
|
|
if (!ret_filter && ca.drv && ca.drv->required)
|
|
die("%s: smudge filter %s failed", path, ca.drv->name);
|
|
|
|
return ret | ret_filter;
|
|
}
|
|
|
|
int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst)
|
|
{
|
|
return convert_to_working_tree_internal(path, src, len, dst, 0);
|
|
}
|
|
|
|
int renormalize_buffer(const char *path, const char *src, size_t len, struct strbuf *dst)
|
|
{
|
|
int ret = convert_to_working_tree_internal(path, src, len, dst, 1);
|
|
if (ret) {
|
|
src = dst->buf;
|
|
len = dst->len;
|
|
}
|
|
return ret | convert_to_git(path, src, len, dst, SAFE_CRLF_RENORMALIZE);
|
|
}
|
|
|
|
/*****************************************************************
|
|
*
|
|
* Streaming conversion support
|
|
*
|
|
*****************************************************************/
|
|
|
|
typedef int (*filter_fn)(struct stream_filter *,
|
|
const char *input, size_t *isize_p,
|
|
char *output, size_t *osize_p);
|
|
typedef void (*free_fn)(struct stream_filter *);
|
|
|
|
struct stream_filter_vtbl {
|
|
filter_fn filter;
|
|
free_fn free;
|
|
};
|
|
|
|
struct stream_filter {
|
|
struct stream_filter_vtbl *vtbl;
|
|
};
|
|
|
|
static int null_filter_fn(struct stream_filter *filter,
|
|
const char *input, size_t *isize_p,
|
|
char *output, size_t *osize_p)
|
|
{
|
|
size_t count;
|
|
|
|
if (!input)
|
|
return 0; /* we do not keep any states */
|
|
count = *isize_p;
|
|
if (*osize_p < count)
|
|
count = *osize_p;
|
|
if (count) {
|
|
memmove(output, input, count);
|
|
*isize_p -= count;
|
|
*osize_p -= count;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void null_free_fn(struct stream_filter *filter)
|
|
{
|
|
; /* nothing -- null instances are shared */
|
|
}
|
|
|
|
static struct stream_filter_vtbl null_vtbl = {
|
|
null_filter_fn,
|
|
null_free_fn,
|
|
};
|
|
|
|
static struct stream_filter null_filter_singleton = {
|
|
&null_vtbl,
|
|
};
|
|
|
|
int is_null_stream_filter(struct stream_filter *filter)
|
|
{
|
|
return filter == &null_filter_singleton;
|
|
}
|
|
|
|
|
|
/*
|
|
* LF-to-CRLF filter
|
|
*/
|
|
|
|
struct lf_to_crlf_filter {
|
|
struct stream_filter filter;
|
|
unsigned has_held:1;
|
|
char held;
|
|
};
|
|
|
|
static int lf_to_crlf_filter_fn(struct stream_filter *filter,
|
|
const char *input, size_t *isize_p,
|
|
char *output, size_t *osize_p)
|
|
{
|
|
size_t count, o = 0;
|
|
struct lf_to_crlf_filter *lf_to_crlf = (struct lf_to_crlf_filter *)filter;
|
|
|
|
/*
|
|
* We may be holding onto the CR to see if it is followed by a
|
|
* LF, in which case we would need to go to the main loop.
|
|
* Otherwise, just emit it to the output stream.
|
|
*/
|
|
if (lf_to_crlf->has_held && (lf_to_crlf->held != '\r' || !input)) {
|
|
output[o++] = lf_to_crlf->held;
|
|
lf_to_crlf->has_held = 0;
|
|
}
|
|
|
|
/* We are told to drain */
|
|
if (!input) {
|
|
*osize_p -= o;
|
|
return 0;
|
|
}
|
|
|
|
count = *isize_p;
|
|
if (count || lf_to_crlf->has_held) {
|
|
size_t i;
|
|
int was_cr = 0;
|
|
|
|
if (lf_to_crlf->has_held) {
|
|
was_cr = 1;
|
|
lf_to_crlf->has_held = 0;
|
|
}
|
|
|
|
for (i = 0; o < *osize_p && i < count; i++) {
|
|
char ch = input[i];
|
|
|
|
if (ch == '\n') {
|
|
output[o++] = '\r';
|
|
} else if (was_cr) {
|
|
/*
|
|
* Previous round saw CR and it is not followed
|
|
* by a LF; emit the CR before processing the
|
|
* current character.
|
|
*/
|
|
output[o++] = '\r';
|
|
}
|
|
|
|
/*
|
|
* We may have consumed the last output slot,
|
|
* in which case we need to break out of this
|
|
* loop; hold the current character before
|
|
* returning.
|
|
*/
|
|
if (*osize_p <= o) {
|
|
lf_to_crlf->has_held = 1;
|
|
lf_to_crlf->held = ch;
|
|
continue; /* break but increment i */
|
|
}
|
|
|
|
if (ch == '\r') {
|
|
was_cr = 1;
|
|
continue;
|
|
}
|
|
|
|
was_cr = 0;
|
|
output[o++] = ch;
|
|
}
|
|
|
|
*osize_p -= o;
|
|
*isize_p -= i;
|
|
|
|
if (!lf_to_crlf->has_held && was_cr) {
|
|
lf_to_crlf->has_held = 1;
|
|
lf_to_crlf->held = '\r';
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void lf_to_crlf_free_fn(struct stream_filter *filter)
|
|
{
|
|
free(filter);
|
|
}
|
|
|
|
static struct stream_filter_vtbl lf_to_crlf_vtbl = {
|
|
lf_to_crlf_filter_fn,
|
|
lf_to_crlf_free_fn,
|
|
};
|
|
|
|
static struct stream_filter *lf_to_crlf_filter(void)
|
|
{
|
|
struct lf_to_crlf_filter *lf_to_crlf = xcalloc(1, sizeof(*lf_to_crlf));
|
|
|
|
lf_to_crlf->filter.vtbl = &lf_to_crlf_vtbl;
|
|
return (struct stream_filter *)lf_to_crlf;
|
|
}
|
|
|
|
/*
|
|
* Cascade filter
|
|
*/
|
|
#define FILTER_BUFFER 1024
|
|
struct cascade_filter {
|
|
struct stream_filter filter;
|
|
struct stream_filter *one;
|
|
struct stream_filter *two;
|
|
char buf[FILTER_BUFFER];
|
|
int end, ptr;
|
|
};
|
|
|
|
static int cascade_filter_fn(struct stream_filter *filter,
|
|
const char *input, size_t *isize_p,
|
|
char *output, size_t *osize_p)
|
|
{
|
|
struct cascade_filter *cas = (struct cascade_filter *) filter;
|
|
size_t filled = 0;
|
|
size_t sz = *osize_p;
|
|
size_t to_feed, remaining;
|
|
|
|
/*
|
|
* input -- (one) --> buf -- (two) --> output
|
|
*/
|
|
while (filled < sz) {
|
|
remaining = sz - filled;
|
|
|
|
/* do we already have something to feed two with? */
|
|
if (cas->ptr < cas->end) {
|
|
to_feed = cas->end - cas->ptr;
|
|
if (stream_filter(cas->two,
|
|
cas->buf + cas->ptr, &to_feed,
|
|
output + filled, &remaining))
|
|
return -1;
|
|
cas->ptr += (cas->end - cas->ptr) - to_feed;
|
|
filled = sz - remaining;
|
|
continue;
|
|
}
|
|
|
|
/* feed one from upstream and have it emit into our buffer */
|
|
to_feed = input ? *isize_p : 0;
|
|
if (input && !to_feed)
|
|
break;
|
|
remaining = sizeof(cas->buf);
|
|
if (stream_filter(cas->one,
|
|
input, &to_feed,
|
|
cas->buf, &remaining))
|
|
return -1;
|
|
cas->end = sizeof(cas->buf) - remaining;
|
|
cas->ptr = 0;
|
|
if (input) {
|
|
size_t fed = *isize_p - to_feed;
|
|
*isize_p -= fed;
|
|
input += fed;
|
|
}
|
|
|
|
/* do we know that we drained one completely? */
|
|
if (input || cas->end)
|
|
continue;
|
|
|
|
/* tell two to drain; we have nothing more to give it */
|
|
to_feed = 0;
|
|
remaining = sz - filled;
|
|
if (stream_filter(cas->two,
|
|
NULL, &to_feed,
|
|
output + filled, &remaining))
|
|
return -1;
|
|
if (remaining == (sz - filled))
|
|
break; /* completely drained two */
|
|
filled = sz - remaining;
|
|
}
|
|
*osize_p -= filled;
|
|
return 0;
|
|
}
|
|
|
|
static void cascade_free_fn(struct stream_filter *filter)
|
|
{
|
|
struct cascade_filter *cas = (struct cascade_filter *)filter;
|
|
free_stream_filter(cas->one);
|
|
free_stream_filter(cas->two);
|
|
free(filter);
|
|
}
|
|
|
|
static struct stream_filter_vtbl cascade_vtbl = {
|
|
cascade_filter_fn,
|
|
cascade_free_fn,
|
|
};
|
|
|
|
static struct stream_filter *cascade_filter(struct stream_filter *one,
|
|
struct stream_filter *two)
|
|
{
|
|
struct cascade_filter *cascade;
|
|
|
|
if (!one || is_null_stream_filter(one))
|
|
return two;
|
|
if (!two || is_null_stream_filter(two))
|
|
return one;
|
|
|
|
cascade = xmalloc(sizeof(*cascade));
|
|
cascade->one = one;
|
|
cascade->two = two;
|
|
cascade->end = cascade->ptr = 0;
|
|
cascade->filter.vtbl = &cascade_vtbl;
|
|
return (struct stream_filter *)cascade;
|
|
}
|
|
|
|
/*
|
|
* ident filter
|
|
*/
|
|
#define IDENT_DRAINING (-1)
|
|
#define IDENT_SKIPPING (-2)
|
|
struct ident_filter {
|
|
struct stream_filter filter;
|
|
struct strbuf left;
|
|
int state;
|
|
char ident[45]; /* ": x40 $" */
|
|
};
|
|
|
|
static int is_foreign_ident(const char *str)
|
|
{
|
|
int i;
|
|
|
|
if (!skip_prefix(str, "$Id: ", &str))
|
|
return 0;
|
|
for (i = 0; str[i]; i++) {
|
|
if (isspace(str[i]) && str[i+1] != '$')
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void ident_drain(struct ident_filter *ident, char **output_p, size_t *osize_p)
|
|
{
|
|
size_t to_drain = ident->left.len;
|
|
|
|
if (*osize_p < to_drain)
|
|
to_drain = *osize_p;
|
|
if (to_drain) {
|
|
memcpy(*output_p, ident->left.buf, to_drain);
|
|
strbuf_remove(&ident->left, 0, to_drain);
|
|
*output_p += to_drain;
|
|
*osize_p -= to_drain;
|
|
}
|
|
if (!ident->left.len)
|
|
ident->state = 0;
|
|
}
|
|
|
|
static int ident_filter_fn(struct stream_filter *filter,
|
|
const char *input, size_t *isize_p,
|
|
char *output, size_t *osize_p)
|
|
{
|
|
struct ident_filter *ident = (struct ident_filter *)filter;
|
|
static const char head[] = "$Id";
|
|
|
|
if (!input) {
|
|
/* drain upon eof */
|
|
switch (ident->state) {
|
|
default:
|
|
strbuf_add(&ident->left, head, ident->state);
|
|
case IDENT_SKIPPING:
|
|
/* fallthru */
|
|
case IDENT_DRAINING:
|
|
ident_drain(ident, &output, osize_p);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
while (*isize_p || (ident->state == IDENT_DRAINING)) {
|
|
int ch;
|
|
|
|
if (ident->state == IDENT_DRAINING) {
|
|
ident_drain(ident, &output, osize_p);
|
|
if (!*osize_p)
|
|
break;
|
|
continue;
|
|
}
|
|
|
|
ch = *(input++);
|
|
(*isize_p)--;
|
|
|
|
if (ident->state == IDENT_SKIPPING) {
|
|
/*
|
|
* Skipping until '$' or LF, but keeping them
|
|
* in case it is a foreign ident.
|
|
*/
|
|
strbuf_addch(&ident->left, ch);
|
|
if (ch != '\n' && ch != '$')
|
|
continue;
|
|
if (ch == '$' && !is_foreign_ident(ident->left.buf)) {
|
|
strbuf_setlen(&ident->left, sizeof(head) - 1);
|
|
strbuf_addstr(&ident->left, ident->ident);
|
|
}
|
|
ident->state = IDENT_DRAINING;
|
|
continue;
|
|
}
|
|
|
|
if (ident->state < sizeof(head) &&
|
|
head[ident->state] == ch) {
|
|
ident->state++;
|
|
continue;
|
|
}
|
|
|
|
if (ident->state)
|
|
strbuf_add(&ident->left, head, ident->state);
|
|
if (ident->state == sizeof(head) - 1) {
|
|
if (ch != ':' && ch != '$') {
|
|
strbuf_addch(&ident->left, ch);
|
|
ident->state = 0;
|
|
continue;
|
|
}
|
|
|
|
if (ch == ':') {
|
|
strbuf_addch(&ident->left, ch);
|
|
ident->state = IDENT_SKIPPING;
|
|
} else {
|
|
strbuf_addstr(&ident->left, ident->ident);
|
|
ident->state = IDENT_DRAINING;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
strbuf_addch(&ident->left, ch);
|
|
ident->state = IDENT_DRAINING;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void ident_free_fn(struct stream_filter *filter)
|
|
{
|
|
struct ident_filter *ident = (struct ident_filter *)filter;
|
|
strbuf_release(&ident->left);
|
|
free(filter);
|
|
}
|
|
|
|
static struct stream_filter_vtbl ident_vtbl = {
|
|
ident_filter_fn,
|
|
ident_free_fn,
|
|
};
|
|
|
|
static struct stream_filter *ident_filter(const unsigned char *sha1)
|
|
{
|
|
struct ident_filter *ident = xmalloc(sizeof(*ident));
|
|
|
|
xsnprintf(ident->ident, sizeof(ident->ident),
|
|
": %s $", sha1_to_hex(sha1));
|
|
strbuf_init(&ident->left, 0);
|
|
ident->filter.vtbl = &ident_vtbl;
|
|
ident->state = 0;
|
|
return (struct stream_filter *)ident;
|
|
}
|
|
|
|
/*
|
|
* Return an appropriately constructed filter for the path, or NULL if
|
|
* the contents cannot be filtered without reading the whole thing
|
|
* in-core.
|
|
*
|
|
* Note that you would be crazy to set CRLF, smuge/clean or ident to a
|
|
* large binary blob you would want us not to slurp into the memory!
|
|
*/
|
|
struct stream_filter *get_stream_filter(const char *path, const unsigned char *sha1)
|
|
{
|
|
struct conv_attrs ca;
|
|
struct stream_filter *filter = NULL;
|
|
|
|
convert_attrs(&ca, path);
|
|
if (ca.drv && (ca.drv->process || ca.drv->smudge || ca.drv->clean))
|
|
return NULL;
|
|
|
|
if (ca.crlf_action == CRLF_AUTO || ca.crlf_action == CRLF_AUTO_CRLF)
|
|
return NULL;
|
|
|
|
if (ca.ident)
|
|
filter = ident_filter(sha1);
|
|
|
|
if (output_eol(ca.crlf_action) == EOL_CRLF)
|
|
filter = cascade_filter(filter, lf_to_crlf_filter());
|
|
else
|
|
filter = cascade_filter(filter, &null_filter_singleton);
|
|
|
|
return filter;
|
|
}
|
|
|
|
void free_stream_filter(struct stream_filter *filter)
|
|
{
|
|
filter->vtbl->free(filter);
|
|
}
|
|
|
|
int stream_filter(struct stream_filter *filter,
|
|
const char *input, size_t *isize_p,
|
|
char *output, size_t *osize_p)
|
|
{
|
|
return filter->vtbl->filter(filter, input, isize_p, output, osize_p);
|
|
}
|