82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
/* $NetBSD: asprintf.c,v 1.2 2007/07/20 00:10:06 tnn Exp $ */
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/*-
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* Copyright (c) 2007 Joerg Sonnenberger <joerg@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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* 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
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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int
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vasprintf(char **ret, const char *fmt, va_list ap)
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{
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char *buf, *new_buf;
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size_t len;
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int retval;
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len = 128;
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buf = malloc(len);
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if (buf == NULL) {
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*ret = NULL;
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return -1;
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}
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retval = vsnprintf(buf, len, fmt, ap);
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if (retval < 0) {
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free(buf);
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*ret = NULL;
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return -1;
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}
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if (retval < len) {
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new_buf = realloc(buf, retval + 1);
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if (new_buf == NULL)
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*ret = buf;
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else
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*ret = new_buf;
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return retval;
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}
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len = (size_t)retval + 1;
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free(buf);
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buf = malloc(len);
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if (buf == NULL) {
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*ret = NULL;
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return -1;
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}
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retval = vsnprintf(buf, len, fmt, ap);
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if (retval != len - 1) {
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free(buf);
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*ret = NULL;
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return -1;
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}
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*ret = buf;
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return retval;
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}
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