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/*
port/vsnprintf.c
Copyright (C) 1999 Lars Brinkhoff. See COPYING for terms and conditions.
*/
#include "config.h"
#include <stdio_.h>
#include <stdarg.h>
#include <stdlib.h>
#include <sys/types.h>
#ifndef HAVE_VPRINTF
#error "Must have vfprintf() and vsprintf()."
#endif
int
vsmprintf (char **s, const char *format, va_list ap)
{
size_t n;
FILE *f;
f = fopen ("/dev/null", "w");
if (f == NULL)
return -1;
n = vfprintf (f, format, ap);
fclose (f);
*s = malloc (n + 1);
if (*s == NULL)
return -1;
return vsprintf (*s, format, ap);
}
#ifndef HAVE_VSNPRINTF
int
vsnprintf (char *str, size_t n, const char *format, va_list ap)
{
char *s;
int m, r;
m = vsmprintf (&s, format, ap);
if (m == -1)
return 0;
if (m + 1 > n)
{
m = n - 1;
r = -1;
}
else
{
r = m;
}
memcpy (str, s, m);
free (s);
str[m] = 0;
return r;
}
int
snprintf (char *s, size_t n, const char *format, ...)
{
va_list ap;
int m;
va_start (ap, format);
m = vsnprintf (s, n, format, ap);
va_end (ap);
return m;
}
#endif /* HAVE_VSNPRINTF */
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