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date: use strbufs in date-formatting functions

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Many of the date functions write into fixed-size buffers.
This is a minor pain, as we have to take special
precautions, and frequently end up copying the result into a
strbuf or heap-allocated buffer anyway (for which we
sometimes use strcpy!).

Let's instead teach parse_date, datestamp, etc to write to a
strbuf. The obvious downside is that we might need to
perform a heap allocation where we otherwise would not need
to. However, it turns out that the only two new allocations
required are:

  1. In test-date.c, where we don't care about efficiency.

  2. In determine_author_info, which is not performance
     critical (and where the use of a strbuf will help later
     refactoring).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King
2014-08-27 03:57:08 -04:00
committed by Junio C Hamano
parent ea5517f04b
commit c33ddc2e33
6 changed files with 45 additions and 48 deletions
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26
ident.c
View File

@ -9,7 +9,7 @@
static struct strbuf git_default_name = STRBUF_INIT;
static struct strbuf git_default_email = STRBUF_INIT;
static char git_default_date[50];
static struct strbuf git_default_date = STRBUF_INIT;
#define IDENT_NAME_GIVEN 01
#define IDENT_MAIL_GIVEN 02
@ -129,9 +129,9 @@ const char *ident_default_email(void)
static const char *ident_default_date(void)
{
if (!git_default_date[0])
datestamp(git_default_date, sizeof(git_default_date));
return git_default_date;
if (!git_default_date.len)
datestamp(&git_default_date);
return git_default_date.buf;
}
static int crud(unsigned char c)
@ -292,7 +292,6 @@ const char *fmt_ident(const char *name, const char *email,
const char *date_str, int flag)
{
static struct strbuf ident = STRBUF_INIT;
char date[50];
int strict = (flag & IDENT_STRICT);
int want_date = !(flag & IDENT_NO_DATE);
int want_name = !(flag & IDENT_NO_NAME);
@ -320,15 +319,6 @@ const char *fmt_ident(const char *name, const char *email,
die("unable to auto-detect email address (got '%s')", email);
}
if (want_date) {
if (date_str && date_str[0]) {
if (parse_date(date_str, date, sizeof(date)) < 0)
die("invalid date format: %s", date_str);
}
else
strcpy(date, ident_default_date());
}
strbuf_reset(&ident);
if (want_name) {
strbuf_addstr_without_crud(&ident, name);
@ -339,8 +329,14 @@ const char *fmt_ident(const char *name, const char *email,
strbuf_addch(&ident, '>');
if (want_date) {
strbuf_addch(&ident, ' ');
strbuf_addstr_without_crud(&ident, date);
if (date_str && date_str[0]) {
if (parse_date(date_str, &ident) < 0)
die("invalid date format: %s", date_str);
}
else
strbuf_addstr(&ident, ident_default_date());
}
return ident.buf;
}