| 1 | /* |
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| 2 | * Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers. |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * By using this file, you agree to the terms and conditions set |
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| 6 | * forth in the LICENSE file which can be found at the top level of |
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| 7 | * the sendmail distribution. |
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| 8 | */ |
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| 9 | |
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| 10 | /* |
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| 11 | * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com> |
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| 12 | * All rights reserved. |
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| 13 | * |
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| 14 | * Redistribution and use in source and binary forms, with or without |
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| 15 | * modification, are permitted provided that the following conditions |
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| 16 | * are met: |
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| 17 | * 1. Redistributions of source code must retain the above copyright |
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| 18 | * notice, this list of conditions and the following disclaimer. |
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| 19 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 20 | * notice, this list of conditions and the following disclaimer in the |
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| 21 | * documentation and/or other materials provided with the distribution. |
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| 22 | * 3. The name of the author may not be used to endorse or promote products |
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| 23 | * derived from this software without specific prior written permission. |
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| 24 | * |
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| 25 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, |
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| 26 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY |
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| 27 | * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL |
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| 28 | * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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| 29 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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| 30 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
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| 31 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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| 32 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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| 33 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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| 34 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 35 | */ |
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| 36 | |
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| 37 | #include <sm/gen.h> |
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| 38 | SM_RCSID("@(#)$Id: vasprintf.c,v 1.1.1.1 2003-04-08 15:06:05 zacheiss Exp $") |
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| 39 | #include <stdlib.h> |
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| 40 | #include <errno.h> |
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| 41 | #include <sm/io.h> |
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| 42 | #include <sm/heap.h> |
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| 43 | #include "local.h" |
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| 44 | |
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| 45 | /* |
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| 46 | ** SM_VASPRINTF -- printf to a dynamically allocated string |
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| 47 | ** |
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| 48 | ** Write 'printf' output to a dynamically allocated string |
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| 49 | ** buffer which is returned to the caller. |
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| 50 | ** |
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| 51 | ** Parameters: |
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| 52 | ** str -- *str receives a pointer to the allocated string |
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| 53 | ** fmt -- format directives for printing |
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| 54 | ** ap -- variable argument list |
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| 55 | ** |
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| 56 | ** Results: |
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| 57 | ** On failure, set *str to NULL, set errno, and return -1. |
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| 58 | ** |
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| 59 | ** On success, set *str to a pointer to a nul-terminated |
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| 60 | ** string buffer containing printf output, and return the |
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| 61 | ** length of the string (not counting the nul). |
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| 62 | */ |
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| 63 | |
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| 64 | #define SM_VA_BUFSIZE 128 |
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| 65 | |
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| 66 | int |
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| 67 | sm_vasprintf(str, fmt, ap) |
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| 68 | char **str; |
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| 69 | const char *fmt; |
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| 70 | SM_VA_LOCAL_DECL |
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| 71 | { |
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| 72 | int ret; |
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| 73 | SM_FILE_T fake; |
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| 74 | unsigned char *base; |
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| 75 | |
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| 76 | fake.sm_magic = SmFileMagic; |
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| 77 | fake.f_timeout = SM_TIME_FOREVER; |
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| 78 | fake.f_timeoutstate = SM_TIME_BLOCK; |
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| 79 | fake.f_file = -1; |
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| 80 | fake.f_flags = SMWR | SMSTR | SMALC; |
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| 81 | fake.f_bf.smb_base = fake.f_p = (unsigned char *)sm_malloc(SM_VA_BUFSIZE); |
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| 82 | if (fake.f_bf.smb_base == NULL) |
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| 83 | goto err2; |
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| 84 | fake.f_close = NULL; |
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| 85 | fake.f_open = NULL; |
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| 86 | fake.f_read = NULL; |
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| 87 | fake.f_write = NULL; |
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| 88 | fake.f_seek = NULL; |
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| 89 | fake.f_setinfo = fake.f_getinfo = NULL; |
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| 90 | fake.f_type = "sm_vasprintf:fake"; |
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| 91 | fake.f_bf.smb_size = fake.f_w = SM_VA_BUFSIZE - 1; |
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| 92 | fake.f_timeout = SM_TIME_FOREVER; |
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| 93 | ret = sm_io_vfprintf(&fake, SM_TIME_FOREVER, fmt, ap); |
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| 94 | if (ret == -1) |
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| 95 | goto err; |
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| 96 | *fake.f_p = '\0'; |
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| 97 | |
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| 98 | /* use no more space than necessary */ |
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| 99 | base = (unsigned char *) sm_realloc(fake.f_bf.smb_base, ret + 1); |
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| 100 | if (base == NULL) |
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| 101 | goto err; |
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| 102 | *str = (char *)base; |
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| 103 | return ret; |
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| 104 | |
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| 105 | err: |
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| 106 | if (fake.f_bf.smb_base != NULL) |
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| 107 | { |
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| 108 | sm_free(fake.f_bf.smb_base); |
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| 109 | fake.f_bf.smb_base = NULL; |
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| 110 | } |
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| 111 | err2: |
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| 112 | *str = NULL; |
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| 113 | errno = ENOMEM; |
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| 114 | return -1; |
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| 115 | } |
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