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 * 13 * Permission to use, copy, modify, and distribute this software for any 14 * purpose with or without fee is hereby granted, provided that the above 15 * copyright notice and this permission notice appear in all copies. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL 18 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE 20 * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 21 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION 22 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 23 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 24 */ 25 26 #include <sm/gen.h> 27 SM_RCSID("@(#)$Id: vasprintf.c,v 1.26.2.1 2003/06/03 02:14:09 ca Exp $") 28 #include <stdlib.h> 29 #include <errno.h> 30 #include <sm/io.h> 31 #include <sm/heap.h> 32 #include "local.h" 33 34 /* 35 ** SM_VASPRINTF -- printf to a dynamically allocated string 36 ** 37 ** Write 'printf' output to a dynamically allocated string 38 ** buffer which is returned to the caller. 39 ** 40 ** Parameters: 41 ** str -- *str receives a pointer to the allocated string 42 ** fmt -- format directives for printing 43 ** ap -- variable argument list 44 ** 45 ** Results: 46 ** On failure, set *str to NULL, set errno, and return -1. 47 ** 48 ** On success, set *str to a pointer to a nul-terminated 49 ** string buffer containing printf output, and return the 50 ** length of the string (not counting the nul). 51 */ 52 53 #define SM_VA_BUFSIZE 128 54 55 int 56 sm_vasprintf(str, fmt, ap) 57 char **str; 58 const char *fmt; 59 SM_VA_LOCAL_DECL 60 { 61 int ret; 62 SM_FILE_T fake; 63 unsigned char *base; 64 65 fake.sm_magic = SmFileMagic; 66 fake.f_timeout = SM_TIME_FOREVER; 67 fake.f_timeoutstate = SM_TIME_BLOCK; 68 fake.f_file = -1; 69 fake.f_flags = SMWR | SMSTR | SMALC; 70 fake.f_bf.smb_base = fake.f_p = (unsigned char *)sm_malloc(SM_VA_BUFSIZE); 71 if (fake.f_bf.smb_base == NULL) 72 goto err2; 73 fake.f_close = NULL; 74 fake.f_open = NULL; 75 fake.f_read = NULL; 76 fake.f_write = NULL; 77 fake.f_seek = NULL; 78 fake.f_setinfo = fake.f_getinfo = NULL; 79 fake.f_type = "sm_vasprintf:fake"; 80 fake.f_bf.smb_size = fake.f_w = SM_VA_BUFSIZE - 1; 81 fake.f_timeout = SM_TIME_FOREVER; 82 ret = sm_io_vfprintf(&fake, SM_TIME_FOREVER, fmt, ap); 83 if (ret == -1) 84 goto err; 85 *fake.f_p = '\0'; 86 87 /* use no more space than necessary */ 88 base = (unsigned char *) sm_realloc(fake.f_bf.smb_base, ret + 1); 89 if (base == NULL) 90 goto err; 91 *str = (char *)base; 92 return ret; 93 94 err: 95 if (fake.f_bf.smb_base != NULL) 96 { 97 sm_free(fake.f_bf.smb_base); 98 fake.f_bf.smb_base = NULL; 99 } 100 err2: 101 *str = NULL; 102 errno = ENOMEM; 103 return -1; 104 } 105