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grep: stop modifying buffer in grep_source_1()

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We find the end of each matching line of a buffer, and then temporarily
write a NUL to turn it into a regular C string. But we don't need to do
so, because the only thing we do in the interim is pass the line and its
length (via an "eol" pointer) to match_line(). And that function should
only look at the bytes we passed it, whether it has a terminating NUL or
not.

We can drop this temporary write in order to simplify the code and make
it easier to use const buffers in more of grep.c.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2021-09-20 23:48:44 -04:00 committed by Junio C Hamano
parent 995e525b17
commit f84e79ff4b
1 changed files with 1 additions and 4 deletions
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grep.c
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@ -1616,7 +1616,7 @@ static int grep_source_1(struct grep_opt *opt, struct grep_source *gs, int colle
bol = gs->buf;
left = gs->size;
while (left) {
char *eol, ch;
char *eol;
int hit;
ssize_t cno;
ssize_t col = -1, icol = -1;
@ -1637,14 +1637,11 @@ static int grep_source_1(struct grep_opt *opt, struct grep_source *gs, int colle
&& look_ahead(opt, &left, &lno, &bol))
break;
eol = end_of_line(bol, &left);
ch = *eol;
*eol = 0;
if ((ctx == GREP_CONTEXT_HEAD) && (eol == bol))
ctx = GREP_CONTEXT_BODY;
hit = match_line(opt, bol, eol, &col, &icol, ctx, collect_hits);
*eol = ch;
if (collect_hits)
goto next_line;