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strbuf: avoid static variables in strbuf_add_commented_lines()

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In strbuf_add_commented_lines(), we have to convert the single-byte
comment_line_char into a string to pass to add_lines(). We cache the
created string using a static-local variable. But this makes the
function non-reentrant, and it's doubtful that this provides any real
performance benefit given that we know the string always contains a
single character.

So let's just create it from scratch each time, and to give the compiler
the maximal opportunity to make it fast we'll ditch the over-complicated
xsnprintf() and just assign directly into the array.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2024-03-12 05:17:15 -04:00 committed by Junio C Hamano
parent db7f93093f
commit 3b45450db6
1 changed files with 3 additions and 3 deletions
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6
strbuf.c
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@ -361,10 +361,10 @@ static void add_lines(struct strbuf *out,
void strbuf_add_commented_lines(struct strbuf *out, const char *buf,
size_t size, char comment_line_char)
{
static char prefix[2];
char prefix[2];
if (prefix[0] != comment_line_char)
xsnprintf(prefix, sizeof(prefix), "%c", comment_line_char);
prefix[0] = comment_line_char;
prefix[1] = '\0';
add_lines(out, prefix, buf, size, 1);
}