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patch-id.c: use strbuf instead of a fixed buffer

get_one_patchid() uses a rather dumb heuristic to determine if the
passed buffer is part of the next commit. Whenever the first 40 bytes
are a valid hexadecimal sha1 representation, get_one_patchid() returns
next_sha1.

Once the current line is longer than the fixed buffer, this will break
(provided the additional bytes make a valid hexadecimal sha1). As a result
patch-id returns incorrect results. Instead, use strbuf and read one line
at a time.

Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Michael Schubert <mschub@elegosoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Michael Schubert authored and gitster committed Sep 21, 2011
1 parent f696543 commit b9ab810b1826a7757e16f152faf0c28c2fdaa679
Showing with 6 additions and 4 deletions.
  1. +6 −4 builtin/patch-id.c
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@@ -56,13 +56,13 @@ static int scan_hunk_header(const char *p, int *p_before, int *p_after)
return 1;
}
-static int get_one_patchid(unsigned char *next_sha1, git_SHA_CTX *ctx)
+static int get_one_patchid(unsigned char *next_sha1, git_SHA_CTX *ctx, struct strbuf *line_buf)
{
- static char line[1000];
int patchlen = 0, found_next = 0;
int before = -1, after = -1;
- while (fgets(line, sizeof(line), stdin) != NULL) {
+ while (strbuf_getwholeline(line_buf, stdin, '\n') != EOF) {
+ char *line = line_buf->buf;
char *p = line;
int len;
@@ -133,14 +133,16 @@ static void generate_id_list(void)
unsigned char sha1[20], n[20];
git_SHA_CTX ctx;
int patchlen;
+ struct strbuf line_buf = STRBUF_INIT;
git_SHA1_Init(&ctx);
hashclr(sha1);
while (!feof(stdin)) {
- patchlen = get_one_patchid(n, &ctx);
+ patchlen = get_one_patchid(n, &ctx, &line_buf);
flush_current_id(patchlen, sha1, &ctx);
hashcpy(sha1, n);
}
+ strbuf_release(&line_buf);
}
static const char patch_id_usage[] = "git patch-id < patch";

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