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/* 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;
}
}
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