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/* $NetBSD: snprintf.c,v 1.6 2008/02/14 19:14:54 tnn Exp $ */
/*-
* Copyright (c) 2007 Tobias Nygren <tnn@NetBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <nbcompat.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if HAVE_STDARG_H
#include <stdarg.h>
#endif
#ifdef MIN
#undef MIN
#endif
#define MIN(a, b) ((a)<(b)?(a):(b))
int
snprintf(char *str, size_t size, const char *format, ...)
{
va_list ap;
int len;
va_start(ap, format);
len = vsnprintf(str, size, format, ap);
va_end(ap);
return len;
}
int
vsnprintf(char *str, size_t size, const char *format, va_list ap)
{
int len;
char buf[129];
char *p = buf;
static FILE *devnull = 0;
if (!devnull) {
devnull = fopen("/dev/null", "w");
if (!devnull)
return -1;
}
len = vfprintf(devnull, format, ap);
if (len < 0)
return len;
if (len > 128) {
p = malloc(len + 1);
if (!p)
return -1;
}
vsprintf(p, format, ap);
if (size > 0) {
memcpy(str, p, MIN(len, size));
str[MIN(len, size - 1)] = 0;
}
if (p != buf)
free(p);
return len;
}
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