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Rewrite asprintf() as a wrapper around vasprintf(), thus reducing the

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number of functions that have an incestuous relationship with the
arcane innards of stdio.
This commit is contained in:
David Schultz 2009-03-02 04:11:42 +00:00
parent 79d440447a
commit 601b205e47
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=189271
1 changed files with 22 additions and 43 deletions
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65
lib/libc/stdio/asprintf.c
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@ -1,8 +1,9 @@
/* $OpenBSD: asprintf.c,v 1.8 2002/02/19 19:39:36 millert Exp $ */
/*
* Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
* All rights reserved.
/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Chris Torek.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@ -12,59 +13,37 @@
* 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``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 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.
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <stdarg.h>
#include "local.h"
int
asprintf(char **str, char const *fmt, ...)
asprintf(char ** __restrict s, char const * __restrict fmt, ...)
{
int ret;
va_list ap;
FILE f;
f._file = -1;
f._flags = __SWR | __SSTR | __SALC;
f._bf._base = f._p = (unsigned char *)malloc(128);
if (f._bf._base == NULL) {
*str = NULL;
errno = ENOMEM;
return (-1);
}
f._bf._size = f._w = 127; /* Leave room for the NUL */
f._orientation = 0;
memset(&f._mbstate, 0, sizeof(mbstate_t));
va_start(ap, fmt);
ret = __vfprintf(&f, fmt, ap); /* Use unlocked __vfprintf */
ret = vasprintf(s, fmt, ap);
va_end(ap);
if (ret < 0) {
free(f._bf._base);
*str = NULL;
errno = ENOMEM;
return (-1);
}
*f._p = '\0';
*str = (char *)f._bf._base;
return (ret);
}