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90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
/* $NetBSD: snprintf.c,v 1.7 2008/06/19 17:28:09 joerg Exp $ */
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/*-
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* Copyright (c) 2007 Tobias Nygren <tnn@NetBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <nbcompat.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#if HAVE_STDARG_H
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#include <stdarg.h>
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#endif
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#ifdef MIN
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#undef MIN
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#endif
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#define MIN(a, b) ((a)<(b)?(a):(b))
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int
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snprintf(char *str, size_t size, const char *format, ...)
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{
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va_list ap;
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int len;
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va_start(ap, format);
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len = vsnprintf(str, size, format, ap);
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va_end(ap);
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return len;
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}
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int
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vsnprintf(char *str, size_t size, const char *format, va_list ap)
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{
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int len;
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char buf[129];
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char *p = buf;
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static FILE *devnull = 0;
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if (devnull == NULL) {
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devnull = fopen("/dev/null", "w");
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if (devnull == NULL)
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return -1;
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}
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len = vfprintf(devnull, format, ap);
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if (len < 0)
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return len;
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if (len > 128) {
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p = malloc(len + 1);
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if (p == NULL)
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return -1;
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}
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vsprintf(p, format, ap);
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if (size > 0) {
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memcpy(str, p, MIN(len, size));
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str[MIN(len, size - 1)] = 0;
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}
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if (p != buf)
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free(p);
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return len;
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}
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