64a965e707
more cleanly integrated with stdio. This should be faster and cleaner since it doesn't memcpy() the data into a seperate buffer. This lets stdio allocate and manage the buffer and then hand it over to the user. Obtained from: Todd Miller <Todd.Miller@courtesan.com> via OpenBSD
66 lines
2.3 KiB
C
66 lines
2.3 KiB
C
/* $OpenBSD: vasprintf.c,v 1.4 1998/06/21 22:13:47 millert Exp $ */
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/*
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* Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
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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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#if defined(LIBC_RCS) && !defined(lint)
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static char rcsid[] = "$Id: vasprintf.c,v 1.8 1998/03/09 06:51:23 jb Exp $";
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#endif /* LIBC_RCS and not lint */
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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int
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vasprintf(str, fmt, ap)
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char **str;
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const char *fmt;
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_BSD_VA_LIST_ ap;
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{
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int ret;
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FILE f;
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f._file = -1;
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f._flags = __SWR | __SSTR | __SALC;
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f._bf._base = f._p = (unsigned char *)malloc(128);
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if (f._bf._base == NULL) {
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*str = NULL;
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errno = ENOMEM;
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return (-1);
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}
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f._bf._size = f._w = 127; /* Leave room for the NULL */
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ret = vfprintf(&f, fmt, ap);
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*f._p = '\0';
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f._bf._base = realloc(f._bf._base, f._bf._size + 1);
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if (f._bf._base == NULL) {
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errno = ENOMEM;
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ret = -1;
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}
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*str = (char *)f._bf._base;
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return (ret);
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}
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