105 lines
2.9 KiB
C
105 lines
2.9 KiB
C
/*
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* Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers.
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* All rights reserved.
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the sendmail distribution.
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*/
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/*
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* Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL
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* WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE
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* FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sm/gen.h>
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SM_RCSID("@(#)$Id: vasprintf.c,v 1.27 2003/06/03 02:14:24 ca Exp $")
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#include <stdlib.h>
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#include <errno.h>
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#include <sm/io.h>
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#include <sm/heap.h>
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#include "local.h"
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/*
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** SM_VASPRINTF -- printf to a dynamically allocated string
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**
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** Write 'printf' output to a dynamically allocated string
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** buffer which is returned to the caller.
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**
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** Parameters:
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** str -- *str receives a pointer to the allocated string
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** fmt -- format directives for printing
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** ap -- variable argument list
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**
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** Results:
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** On failure, set *str to NULL, set errno, and return -1.
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**
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** On success, set *str to a pointer to a nul-terminated
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** string buffer containing printf output, and return the
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** length of the string (not counting the nul).
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*/
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#define SM_VA_BUFSIZE 128
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int
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sm_vasprintf(str, fmt, ap)
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char **str;
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const char *fmt;
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SM_VA_LOCAL_DECL
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{
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int ret;
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SM_FILE_T fake;
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unsigned char *base;
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fake.sm_magic = SmFileMagic;
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fake.f_timeout = SM_TIME_FOREVER;
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fake.f_timeoutstate = SM_TIME_BLOCK;
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fake.f_file = -1;
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fake.f_flags = SMWR | SMSTR | SMALC;
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fake.f_bf.smb_base = fake.f_p = (unsigned char *)sm_malloc(SM_VA_BUFSIZE);
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if (fake.f_bf.smb_base == NULL)
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goto err2;
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fake.f_close = NULL;
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fake.f_open = NULL;
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fake.f_read = NULL;
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fake.f_write = NULL;
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fake.f_seek = NULL;
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fake.f_setinfo = fake.f_getinfo = NULL;
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fake.f_type = "sm_vasprintf:fake";
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fake.f_bf.smb_size = fake.f_w = SM_VA_BUFSIZE - 1;
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fake.f_timeout = SM_TIME_FOREVER;
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ret = sm_io_vfprintf(&fake, SM_TIME_FOREVER, fmt, ap);
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if (ret == -1)
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goto err;
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*fake.f_p = '\0';
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/* use no more space than necessary */
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base = (unsigned char *) sm_realloc(fake.f_bf.smb_base, ret + 1);
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if (base == NULL)
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goto err;
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*str = (char *)base;
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return ret;
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err:
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if (fake.f_bf.smb_base != NULL)
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{
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sm_free(fake.f_bf.smb_base);
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fake.f_bf.smb_base = NULL;
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}
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err2:
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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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