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strbuf: let strbuf_addftime handle %z and %Z itself

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There is no portable way to pass timezone information to strftime.  Add
parameters for timezone offset and name to strbuf_addftime and let it
handle the timezone-related format specifiers %z and %Z internally.

Callers can opt out for %Z by passing NULL as timezone name.  %z is
always handled internally -- this helps on Windows, where strftime would
expand it to a timezone name (same as %Z), in violation of POSIX.
Modifiers are not handled, e.g. %Ez is still passed to strftime.

Use an empty string as timezone name in show_date (the only current
caller) for now because we only have the timezone offset in non-local
mode.  POSIX allows %Z to resolve to an empty string in case of missing
information.

Helped-by: Ulrich Mueller <ulm@gentoo.org>
Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Rene Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
René Scharfe
2017-06-15 14:29:53 +02:00
committed by Junio C Hamano
parent b06d364310
commit c3fbf81a85
5 changed files with 53 additions and 7 deletions
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41
strbuf.c
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@ -785,14 +785,48 @@ 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, const char *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 (tz_name) {
strbuf_addstr(&munged_fmt, 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);
@ -804,17 +838,16 @@ 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);
}