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authorJeff King <peff@peff.net>2011-02-25 23:08:53 -0600
committerJunio C Hamano <gitster@pobox.com>2011-02-26 01:06:50 -0800
commitebeb60900fbab569ed14f710a0a1abb1637ec792 (patch)
treece1d20fec4ef43f883230238eed21be1a598b1e0 /strbuf.c
parentab8632ae36d2e5faf524309696725b60ec18e588 (diff)
downloadgit-ebeb60900fbab569ed14f710a0a1abb1637ec792.tar.gz
git-ebeb60900fbab569ed14f710a0a1abb1637ec792.tar.xz
strbuf: add strbuf_vaddf
In a variable-args function, the code for writing into a strbuf is non-trivial. We ended up cutting and pasting it in several places because there was no vprintf-style function for strbufs (which in turn was held up by a lack of va_copy). Now that we have a fallback va_copy, we can add strbuf_vaddf, the strbuf equivalent of vsprintf. And we can clean up the cut and paste mess. Signed-off-by: Jeff King <peff@peff.net> Improved-by: Christian Couder <christian.couder@gmail.com> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'strbuf.c')
-rw-r--r--strbuf.c25
1 files changed, 15 insertions, 10 deletions
diff --git a/strbuf.c b/strbuf.c
index 07e8883ce..77444a94d 100644
--- a/strbuf.c
+++ b/strbuf.c
@@ -195,24 +195,29 @@ void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len)
void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
{
- int len;
va_list ap;
+ va_start(ap, fmt);
+ strbuf_vaddf(sb, fmt, ap);
+ va_end(ap);
+}
+
+void strbuf_vaddf(struct strbuf *sb, const char *fmt, va_list ap)
+{
+ int len;
+ va_list cp;
if (!strbuf_avail(sb))
strbuf_grow(sb, 64);
- va_start(ap, fmt);
- len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
- va_end(ap);
+ va_copy(cp, ap);
+ len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, cp);
+ va_end(cp);
if (len < 0)
- die("your vsnprintf is broken");
+ die("BUG: your vsnprintf is broken (returned %d)", len);
if (len > strbuf_avail(sb)) {
strbuf_grow(sb, len);
- va_start(ap, fmt);
len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
- va_end(ap);
- if (len > strbuf_avail(sb)) {
- die("this should not happen, your snprintf is broken");
- }
+ if (len > strbuf_avail(sb))
+ die("BUG: your vsnprintf is broken (insatiable)");
}
strbuf_setlen(sb, sb->len + len);
}