1 /* 2 * Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers. 3 * All rights reserved. 4 * 5 * By using this file, you agree to the terms and conditions set 6 * forth in the LICENSE file which can be found at the top level of 7 * the sendmail distribution. 8 */ 9 10 /* 11 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com> 12 * All rights reserved. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. The name of the author may not be used to endorse or promote products 23 * derived from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 26 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 27 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 28 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 29 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 30 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 31 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 32 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 33 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 34 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 35 */ 36 37 #include <sm/gen.h> 38 SM_RCSID("@(#)$Id: vasprintf.c,v 1.26 2001/09/11 04:04:49 gshapiro Exp $") 39 #include <stdlib.h> 40 #include <errno.h> 41 #include <sm/io.h> 42 #include <sm/heap.h> 43 #include "local.h" 44 45 /* 46 ** SM_VASPRINTF -- printf to a dynamically allocated string 47 ** 48 ** Write 'printf' output to a dynamically allocated string 49 ** buffer which is returned to the caller. 50 ** 51 ** Parameters: 52 ** str -- *str receives a pointer to the allocated string 53 ** fmt -- format directives for printing 54 ** ap -- variable argument list 55 ** 56 ** Results: 57 ** On failure, set *str to NULL, set errno, and return -1. 58 ** 59 ** On success, set *str to a pointer to a nul-terminated 60 ** string buffer containing printf output, and return the 61 ** length of the string (not counting the nul). 62 */ 63 64 #define SM_VA_BUFSIZE 128 65 66 int 67 sm_vasprintf(str, fmt, ap) 68 char **str; 69 const char *fmt; 70 SM_VA_LOCAL_DECL 71 { 72 int ret; 73 SM_FILE_T fake; 74 unsigned char *base; 75 76 fake.sm_magic = SmFileMagic; 77 fake.f_timeout = SM_TIME_FOREVER; 78 fake.f_timeoutstate = SM_TIME_BLOCK; 79 fake.f_file = -1; 80 fake.f_flags = SMWR | SMSTR | SMALC; 81 fake.f_bf.smb_base = fake.f_p = (unsigned char *)sm_malloc(SM_VA_BUFSIZE); 82 if (fake.f_bf.smb_base == NULL) 83 goto err2; 84 fake.f_close = NULL; 85 fake.f_open = NULL; 86 fake.f_read = NULL; 87 fake.f_write = NULL; 88 fake.f_seek = NULL; 89 fake.f_setinfo = fake.f_getinfo = NULL; 90 fake.f_type = "sm_vasprintf:fake"; 91 fake.f_bf.smb_size = fake.f_w = SM_VA_BUFSIZE - 1; 92 fake.f_timeout = SM_TIME_FOREVER; 93 ret = sm_io_vfprintf(&fake, SM_TIME_FOREVER, fmt, ap); 94 if (ret == -1) 95 goto err; 96 *fake.f_p = '\0'; 97 98 /* use no more space than necessary */ 99 base = (unsigned char *) sm_realloc(fake.f_bf.smb_base, ret + 1); 100 if (base == NULL) 101 goto err; 102 *str = (char *)base; 103 return ret; 104 105 err: 106 if (fake.f_bf.smb_base != NULL) 107 { 108 sm_free(fake.f_bf.smb_base); 109 fake.f_bf.smb_base = NULL; 110 } 111 err2: 112 *str = NULL; 113 errno = ENOMEM; 114 return -1; 115 } 116