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authorJohannes Schindelin <johannes.schindelin@gmx.de>2016-09-21 20:24:14 +0200
committerJunio C Hamano <gitster@pobox.com>2016-09-21 13:56:15 -0700
commitb7d36ffca02c23f545d6e098d78180e6e72dfd8d (patch)
treeee20baae52d14d948c581efdbf30aff6fa2ee62e
parent2f8952250a84313b74f96abb7b035874854cf202 (diff)
downloadgit-b7d36ffca02c23f545d6e098d78180e6e72dfd8d.tar.gz
regex: use regexec_buf()
The new regexec_buf() function operates on buffers with an explicitly specified length, rather than NUL-terminated strings. We need to use this function whenever the buffer we want to pass to regexec(3) may have been mmap(2)ed (and is hence not NUL-terminated). Note: the original motivation for this patch was to fix a bug where `git diff -G <regex>` would crash. This patch converts more callers, though, some of which allocated to construct NUL-terminated strings, or worse, modified buffers to temporarily insert NULs while calling regexec(3). By converting them to use regexec_buf(), the code has become much cleaner. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
-rw-r--r--diff.c3
-rw-r--r--diffcore-pickaxe.c18
-rw-r--r--grep.c14
-rwxr-xr-xt/t4062-diff-pickaxe.sh2
-rw-r--r--xdiff-interface.c13
5 files changed, 17 insertions, 33 deletions
diff --git a/diff.c b/diff.c
index 059123c5dc..f77324e9e0 100644
--- a/diff.c
+++ b/diff.c
@@ -941,7 +941,8 @@ static int find_word_boundaries(mmfile_t *buffer, regex_t *word_regex,
{
if (word_regex && *begin < buffer->size) {
regmatch_t match[1];
- if (!regexec(word_regex, buffer->ptr + *begin, 1, match, 0)) {
+ if (!regexec_buf(word_regex, buffer->ptr + *begin,
+ buffer->size - *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;
diff --git a/diffcore-pickaxe.c b/diffcore-pickaxe.c
index 7715c13ec4..8413d76582 100644
--- a/diffcore-pickaxe.c
+++ b/diffcore-pickaxe.c
@@ -21,7 +21,6 @@ static void diffgrep_consume(void *priv, char *line, unsigned long len)
{
struct diffgrep_cb *data = priv;
regmatch_t regmatch;
- int hold;
if (line[0] != '+' && line[0] != '-')
return;
@@ -31,11 +30,8 @@ static void diffgrep_consume(void *priv, char *line, unsigned long len)
* caller early.
*/
return;
- /* Yuck -- line ought to be "const char *"! */
- hold = line[len];
- line[len] = '\0';
- data->hit = !regexec(data->regexp, line + 1, 1, &regmatch, 0);
- line[len] = hold;
+ data->hit = !regexec_buf(data->regexp, line + 1, len - 1, 1,
+ &regmatch, 0);
}
static int diff_grep(mmfile_t *one, mmfile_t *two,
@@ -48,9 +44,11 @@ static int diff_grep(mmfile_t *one, mmfile_t *two,
xdemitconf_t xecfg;
if (!one)
- return !regexec(regexp, two->ptr, 1, &regmatch, 0);
+ return !regexec_buf(regexp, two->ptr, two->size,
+ 1, &regmatch, 0);
if (!two)
- return !regexec(regexp, one->ptr, 1, &regmatch, 0);
+ return !regexec_buf(regexp, one->ptr, one->size,
+ 1, &regmatch, 0);
/*
* We have both sides; need to run textual diff and see if
@@ -81,8 +79,8 @@ static unsigned int contains(mmfile_t *mf, regex_t *regexp, kwset_t kws)
regmatch_t regmatch;
int flags = 0;
- assert(data[sz] == '\0');
- while (*data && !regexec(regexp, data, 1, &regmatch, flags)) {
+ while (*data &&
+ !regexec_buf(regexp, data, sz, 1, &regmatch, flags)) {
flags |= REG_NOTBOL;
data += regmatch.rm_eo;
if (*data && regmatch.rm_so == regmatch.rm_eo)
diff --git a/grep.c b/grep.c
index 528b652f71..8ed56236f0 100644
--- a/grep.c
+++ b/grep.c
@@ -848,17 +848,6 @@ static int fixmatch(struct grep_pat *p, char *line, char *eol,
}
}
-static int regmatch(const regex_t *preg, char *line, char *eol,
- regmatch_t *match, int eflags)
-{
-#ifdef REG_STARTEND
- match->rm_so = 0;
- match->rm_eo = eol - line;
- eflags |= REG_STARTEND;
-#endif
- return regexec(preg, line, 1, match, eflags);
-}
-
static int patmatch(struct grep_pat *p, char *line, char *eol,
regmatch_t *match, int eflags)
{
@@ -869,7 +858,8 @@ static int patmatch(struct grep_pat *p, char *line, char *eol,
else if (p->pcre_regexp)
hit = !pcrematch(p, line, eol, match, eflags);
else
- hit = !regmatch(&p->regexp, line, eol, match, eflags);
+ hit = !regexec_buf(&p->regexp, line, eol - line, 1, match,
+ eflags);
return hit;
}
diff --git a/t/t4062-diff-pickaxe.sh b/t/t4062-diff-pickaxe.sh
index 5929f2eabb..f0bf50bda7 100755
--- a/t/t4062-diff-pickaxe.sh
+++ b/t/t4062-diff-pickaxe.sh
@@ -14,7 +14,7 @@ test_expect_success setup '
test_tick &&
git commit -m "A 4k file"
'
-test_expect_failure '-G matches' '
+test_expect_success '-G matches' '
git diff --name-only -G "^0{4096}$" HEAD^ >out &&
test 4096-zeroes.txt = "$(cat out)"
'
diff --git a/xdiff-interface.c b/xdiff-interface.c
index 54236f24b9..08a7313e6a 100644
--- a/xdiff-interface.c
+++ b/xdiff-interface.c
@@ -216,11 +216,10 @@ struct ff_regs {
static long ff_regexp(const char *line, long len,
char *buffer, long buffer_size, void *priv)
{
- char *line_buffer;
struct ff_regs *regs = priv;
regmatch_t pmatch[2];
int i;
- int result = -1;
+ int result;
/* Exclude terminating newline (and cr) from matching */
if (len > 0 && line[len-1] == '\n') {
@@ -230,18 +229,16 @@ static long ff_regexp(const char *line, long len,
len--;
}
- line_buffer = xstrndup(line, len); /* make NUL terminated */
-
for (i = 0; i < regs->nr; i++) {
struct ff_reg *reg = regs->array + i;
- if (!regexec(&reg->re, line_buffer, 2, pmatch, 0)) {
+ if (!regexec_buf(&reg->re, line, len, 2, pmatch, 0)) {
if (reg->negate)
- goto fail;
+ return -1;
break;
}
}
if (regs->nr <= i)
- goto fail;
+ return -1;
i = pmatch[1].rm_so >= 0 ? 1 : 0;
line += pmatch[i].rm_so;
result = pmatch[i].rm_eo - pmatch[i].rm_so;
@@ -250,8 +247,6 @@ static long ff_regexp(const char *line, long len,
while (result > 0 && (isspace(line[result - 1])))
result--;
memcpy(buffer, line, result);
- fail:
- free(line_buffer);
return result;
}