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/*
* Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers.
* All rights reserved.
*
* By using this file, you agree to the terms and conditions set
* forth in the LICENSE file which can be found at the top level of
* the sendmail distribution.
*/
/*
* Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
* 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.
* 3. The name of the author may not 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.
*/
#include <sm/gen.h>
SM_RCSID("@(#)$Sendmail: vasprintf.c,v 1.24 2001/03/06 17:28:06 ca Exp $")
#include <stdlib.h>
#include <errno.h>
#include <sm/io.h>
#include <sm/heap.h>
#include "local.h"
/*
** SM_VASPRINTF -- printf to a dynamically allocated string
**
** Write 'printf' output to a dynamically allocated string
** buffer which is returned to the caller.
**
** Parameters:
** str -- *str receives a pointer to the allocated string
** fmt -- format directives for printing
** ap -- variable argument list
**
** Results:
** On failure, set *str to NULL, set errno, and return -1.
**
** On success, set *str to a pointer to a nul-terminated
** string buffer containing printf output, and return the
** length of the string (not counting the nul).
*/
#define SM_VA_BUFSIZE 128
int
sm_vasprintf(str, fmt, ap)
char **str;
const char *fmt;
SM_VA_LOCAL_DECL
{
int ret;
SM_FILE_T fake;
unsigned char *base;
fake.sm_magic = SmFileMagic;
fake.f_timeout = SM_TIME_FOREVER;
fake.f_timeoutstate = SM_TIME_BLOCK;
fake.f_file = -1;
fake.f_flags = SMWR | SMSTR | SMALC;
fake.f_bf.smb_base = fake.f_p = (unsigned char *)sm_malloc(SM_VA_BUFSIZE);
if (fake.f_bf.smb_base == NULL)
goto err2;
fake.f_close = NULL;
fake.f_open = NULL;
fake.f_read = NULL;
fake.f_write = NULL;
fake.f_seek = NULL;
fake.f_setinfo = fake.f_getinfo = NULL;
fake.f_type = "sm_vasprintf:fake";
fake.f_bf.smb_size = fake.f_w = SM_VA_BUFSIZE - 1;
fake.f_timeout = SM_TIME_FOREVER;
ret = sm_io_vfprintf(&fake, SM_TIME_FOREVER, fmt, ap);
if (ret == -1)
goto err;
*fake.f_p = '\0';
/* use no more space than necessary */
base = (unsigned char *) sm_realloc(fake.f_bf.smb_base, ret + 1);
if (base == NULL)
goto err;
*str = (char *)base;
return ret;
err:
if (fake.f_bf.smb_base != NULL)
{
sm_free(fake.f_bf.smb_base);
fake.f_bf.smb_base = NULL;
}
err2:
*str = NULL;
errno = ENOMEM;
return -1;
}
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