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#define _POSIX_C_SOURCE 200809L
#include "utils.h"
#include <errno.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
char *astrftime(const char *const fmt, const struct tm *const tm)
{
char *ret = NULL, *s = NULL;
size_t n = sizeof ".";
const locale_t l = newlocale(LC_TIME_MASK, "POSIX", (locale_t)0);
if (l == (locale_t)0)
{
fprintf(stderr, "%s: newlocale(3): %s\n", __func__, strerror(errno));
goto end;
}
else if (!(s = malloc(n)))
{
fprintf(stderr, "%s: malloc(3): %s\n", __func__, strerror(errno));
goto end;
}
for (;;)
{
const int res = strftime_l(s, n, fmt, tm, l);
if (!res)
{
char *const ss = realloc(s, ++n);
if (!s)
{
fprintf(stderr, "%s: realloc(3): %s\n", __func__,
strerror(errno));
goto end;
}
s = ss;
}
else
break;
}
ret = s;
end:
if (!ret)
free(s);
freelocale(l);
return ret;
}
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