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rerere: lift PATH_MAX limitation

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The MERGE_RR file records a collection of NUL-terminated entries,
each of which consists of

 - a hash that identifies the conflict
 - a HT
 - the pathname

We used to read this piece-by-piece, and worse yet, read the
pathname part a byte at a time into a fixed buffer of size PATH_MAX.

Instead, read a whole entry using strbuf_getwholeline() and parse
out the fields.  This way, we issue fewer read(2) calls and more
importantly we do not have to limit the pathname to PATH_MAX.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2015-06-28 15:51:59 -07:00
parent 8d9b5a4ada
commit f5800f6ad8
1 changed files with 15 additions and 20 deletions
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35
rerere.c
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@ -35,32 +35,27 @@ static int has_rerere_resolution(const char *hex)
static void read_rr(struct string_list *rr)
{
unsigned char sha1[20];
char buf[PATH_MAX];
struct strbuf buf = STRBUF_INIT;
FILE *in = fopen(merge_rr_path, "r");
if (!in)
return;
while (fread(buf, 40, 1, in) == 1) {
int i;
char *name;
if (get_sha1_hex(buf, sha1))
while (!strbuf_getwholeline(&buf, in, '\0')) {
char *path;
unsigned char sha1[20];
/* There has to be the hash, tab, path and then NUL */
if (buf.len < 42 || get_sha1_hex(buf.buf, sha1))
die("corrupt MERGE_RR");
buf[40] = '\0';
name = xstrdup(buf);
if (fgetc(in) != '\t')
if (buf.buf[40] != '\t')
die("corrupt MERGE_RR");
for (i = 0; i < sizeof(buf); i++) {
int c = fgetc(in);
if (c < 0)
die("corrupt MERGE_RR");
buf[i] = c;
if (c == 0)
break;
}
if (i == sizeof(buf))
die("filename too long");
string_list_insert(rr, buf)->util = name;
buf.buf[40] = '\0';
path = buf.buf + 41;
string_list_insert(rr, path)->util = xstrdup(buf.buf);
}
strbuf_release(&buf);
fclose(in);
}