mirror of
git://git.sv.gnu.org/coreutils.git
synced 2026-02-19 22:02:21 +02:00
70 lines
2.1 KiB
C
70 lines
2.1 KiB
C
/* xanstrftime.c -- format date/time into xmalloc'd storage
|
|
Copyright (C) 2005 Free Software Foundation, Inc.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software Foundation,
|
|
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
|
|
|
|
/* Written by Jim Meyering. */
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <stdbool.h>
|
|
|
|
#include "xanstrftime.h"
|
|
|
|
#include "strftime.h"
|
|
#include "xalloc.h"
|
|
|
|
/* Return true if the nstrftime expansion of FORMAT (given DATE_TIME, etc.)
|
|
is the empty string (this happens with %p in many locales).
|
|
Otherwise, return false. */
|
|
static bool
|
|
degenerate_format (char const *format, struct tm const *date_time,
|
|
int ut, int ns)
|
|
{
|
|
size_t format_len = strlen (format);
|
|
char *fake_fmt = xmalloc (format_len + 2);
|
|
bool degenerate;
|
|
char buf[2];
|
|
|
|
/* Create a copy of FORMAT with a space prepended. */
|
|
fake_fmt[0] = ' ';
|
|
memcpy (&fake_fmt[1], format, format_len + 1);
|
|
|
|
degenerate = nstrftime (buf, sizeof buf, fake_fmt, date_time, ut, ns) == 1;
|
|
free (fake_fmt);
|
|
|
|
return degenerate;
|
|
}
|
|
|
|
/* Like nstrftime, but take no buffer or length parameters and
|
|
instead return the formatted result in malloc'd storage.
|
|
Call xalloc_die upon allocation failure. */
|
|
char *
|
|
xanstrftime (char const *format, struct tm const *date_time, int ut, int ns)
|
|
{
|
|
bool first = true;
|
|
char *buf = NULL;
|
|
size_t buf_length = 0;
|
|
|
|
while (true)
|
|
{
|
|
buf = X2REALLOC (buf, &buf_length);
|
|
if (nstrftime (buf, buf_length, format, date_time, ut, ns)
|
|
|| (first && degenerate_format (format, date_time, ut, ns)))
|
|
return buf;
|
|
first = false;
|
|
}
|
|
}
|