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-rw-r--r--strbuf.c40
1 files changed, 36 insertions, 4 deletions
diff --git a/strbuf.c b/strbuf.c
index 9103bc75e4..89d22e3b09 100644
--- a/strbuf.c
+++ b/strbuf.c
@@ -778,14 +778,47 @@ char *xstrfmt(const char *fmt, ...)
return ret;
}
-void strbuf_addftime(struct strbuf *sb, const char *fmt, const struct tm *tm)
+void strbuf_addftime(struct strbuf *sb, const char *fmt, const struct tm *tm,
+ int tz_offset, int suppress_tz_name)
{
+ struct strbuf munged_fmt = STRBUF_INIT;
size_t hint = 128;
size_t len;
if (!*fmt)
return;
+ /*
+ * There is no portable way to pass timezone information to
+ * strftime, so we handle %z and %Z here.
+ */
+ for (;;) {
+ const char *percent = strchrnul(fmt, '%');
+ strbuf_add(&munged_fmt, fmt, percent - fmt);
+ if (!*percent)
+ break;
+ fmt = percent + 1;
+ switch (*fmt) {
+ case '%':
+ strbuf_addstr(&munged_fmt, "%%");
+ fmt++;
+ break;
+ case 'z':
+ strbuf_addf(&munged_fmt, "%+05d", tz_offset);
+ fmt++;
+ break;
+ case 'Z':
+ if (suppress_tz_name) {
+ fmt++;
+ break;
+ }
+ /* FALLTHROUGH */
+ default:
+ strbuf_addch(&munged_fmt, '%');
+ }
+ }
+ fmt = munged_fmt.buf;
+
strbuf_grow(sb, hint);
len = strftime(sb->buf + sb->len, sb->alloc - sb->len, fmt, tm);
@@ -797,17 +830,16 @@ void strbuf_addftime(struct strbuf *sb, const char *fmt, const struct tm *tm)
* output contains at least one character, and then drop the extra
* character before returning.
*/
- struct strbuf munged_fmt = STRBUF_INIT;
- strbuf_addf(&munged_fmt, "%s ", fmt);
+ strbuf_addch(&munged_fmt, ' ');
while (!len) {
hint *= 2;
strbuf_grow(sb, hint);
len = strftime(sb->buf + sb->len, sb->alloc - sb->len,
munged_fmt.buf, tm);
}
- strbuf_release(&munged_fmt);
len--; /* drop munged space */
}
+ strbuf_release(&munged_fmt);
strbuf_setlen(sb, sb->len + len);
}