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http: simplify update_url_from_redirect

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This function looks for a common tail between what we asked
for and where we were redirected to, but it open-codes the
comparison. We can avoid some confusing subtractions by
using strip_suffix_mem().

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2016-12-06 13:24:29 -05:00 committed by Junio C Hamano
parent 0202c411ed
commit 986d7f4d37
1 changed files with 4 additions and 6 deletions
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10
http.c
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@ -1500,7 +1500,7 @@ static int update_url_from_redirect(struct strbuf *base,
const struct strbuf *got)
{
const char *tail;
size_t tail_len;
size_t new_len;
if (!strcmp(asked, got->buf))
return 0;
@ -1509,14 +1509,12 @@ static int update_url_from_redirect(struct strbuf *base,
die("BUG: update_url_from_redirect: %s is not a superset of %s",
asked, base->buf);
tail_len = strlen(tail);
if (got->len < tail_len ||
strcmp(tail, got->buf + got->len - tail_len))
new_len = got->len;
if (!strip_suffix_mem(got->buf, &new_len, tail))
return 0; /* insane redirect scheme */
strbuf_reset(base);
strbuf_add(base, got->buf, got->len - tail_len);
strbuf_add(base, got->buf, new_len);
return 1;
}