Damien Miller | 57f3915 | 2005-11-24 19:58:19 +1100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2004 Darren Tucker. |
| 3 | * |
| 4 | * Based originally on asprintf.c from OpenBSD: |
| 5 | * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com> |
| 6 | * |
| 7 | * Permission to use, copy, modify, and distribute this software for any |
| 8 | * purpose with or without fee is hereby granted, provided that the above |
| 9 | * copyright notice and this permission notice appear in all copies. |
| 10 | * |
| 11 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| 12 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| 13 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| 14 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 15 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 16 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| 17 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 18 | */ |
| 19 | |
| 20 | #include "includes.h" |
| 21 | |
| 22 | #ifndef HAVE_VASPRINTF |
| 23 | |
Darren Tucker | 2eaea99 | 2006-07-12 23:41:33 +1000 | [diff] [blame] | 24 | #include <errno.h> |
| 25 | #include <stdarg.h> |
Darren Tucker | f78fb54 | 2006-08-06 21:25:24 +1000 | [diff] [blame] | 26 | #include <stdlib.h> |
Darren Tucker | 2eaea99 | 2006-07-12 23:41:33 +1000 | [diff] [blame] | 27 | |
Damien Miller | 57f3915 | 2005-11-24 19:58:19 +1100 | [diff] [blame] | 28 | #ifndef VA_COPY |
| 29 | # ifdef HAVE_VA_COPY |
| 30 | # define VA_COPY(dest, src) va_copy(dest, src) |
| 31 | # else |
| 32 | # ifdef HAVE___VA_COPY |
| 33 | # define VA_COPY(dest, src) __va_copy(dest, src) |
| 34 | # else |
| 35 | # define VA_COPY(dest, src) (dest) = (src) |
| 36 | # endif |
| 37 | # endif |
| 38 | #endif |
| 39 | |
| 40 | #define INIT_SZ 128 |
| 41 | |
Damien Miller | be6db83 | 2006-12-05 22:58:09 +1100 | [diff] [blame] | 42 | int |
| 43 | vasprintf(char **str, const char *fmt, va_list ap) |
Damien Miller | 57f3915 | 2005-11-24 19:58:19 +1100 | [diff] [blame] | 44 | { |
| 45 | int ret = -1; |
| 46 | va_list ap2; |
| 47 | char *string, *newstr; |
| 48 | size_t len; |
| 49 | |
| 50 | VA_COPY(ap2, ap); |
| 51 | if ((string = malloc(INIT_SZ)) == NULL) |
| 52 | goto fail; |
| 53 | |
| 54 | ret = vsnprintf(string, INIT_SZ, fmt, ap2); |
| 55 | if (ret >= 0 && ret < INIT_SZ) { /* succeeded with initial alloc */ |
| 56 | *str = string; |
Damien Miller | be6db83 | 2006-12-05 22:58:09 +1100 | [diff] [blame] | 57 | } else if (ret == INT_MAX || ret < 0) { /* Bad length */ |
Darren Tucker | 84287b8 | 2007-09-14 10:04:15 +1000 | [diff] [blame] | 58 | free(string); |
Damien Miller | 57f3915 | 2005-11-24 19:58:19 +1100 | [diff] [blame] | 59 | goto fail; |
| 60 | } else { /* bigger than initial, realloc allowing for nul */ |
| 61 | len = (size_t)ret + 1; |
| 62 | if ((newstr = realloc(string, len)) == NULL) { |
| 63 | free(string); |
| 64 | goto fail; |
| 65 | } else { |
| 66 | va_end(ap2); |
| 67 | VA_COPY(ap2, ap); |
| 68 | ret = vsnprintf(newstr, len, fmt, ap2); |
| 69 | if (ret >= 0 && (size_t)ret < len) { |
| 70 | *str = newstr; |
| 71 | } else { /* failed with realloc'ed string, give up */ |
| 72 | free(newstr); |
| 73 | goto fail; |
| 74 | } |
| 75 | } |
| 76 | } |
| 77 | va_end(ap2); |
| 78 | return (ret); |
| 79 | |
| 80 | fail: |
| 81 | *str = NULL; |
| 82 | errno = ENOMEM; |
| 83 | va_end(ap2); |
| 84 | return (-1); |
| 85 | } |
| 86 | #endif |
| 87 | |
| 88 | #ifndef HAVE_ASPRINTF |
| 89 | int asprintf(char **str, const char *fmt, ...) |
| 90 | { |
| 91 | va_list ap; |
| 92 | int ret; |
| 93 | |
| 94 | *str = NULL; |
| 95 | va_start(ap, fmt); |
| 96 | ret = vasprintf(str, fmt, ap); |
| 97 | va_end(ap); |
| 98 | |
| 99 | return ret; |
| 100 | } |
| 101 | #endif |