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 24 #ifndef VA_COPY 25 # ifdef HAVE_VA_COPY 26 # define VA_COPY(dest, src) va_copy(dest, src) 27 # else 28 # ifdef HAVE___VA_COPY 29 # define VA_COPY(dest, src) __va_copy(dest, src) 30 # else 31 # define VA_COPY(dest, src) (dest) = (src) 32 # endif 33 # endif 34 #endif 35 36 #define INIT_SZ 128 37 38 int vasprintf(char **str, const char *fmt, va_list ap) 39 { 40 int ret = -1; 41 va_list ap2; 42 char *string, *newstr; 43 size_t len; 44 45 VA_COPY(ap2, ap); 46 if ((string = malloc(INIT_SZ)) == NULL) 47 goto fail; 48 49 ret = vsnprintf(string, INIT_SZ, fmt, ap2); 50 if (ret >= 0 && ret < INIT_SZ) { /* succeeded with initial alloc */ 51 *str = string; 52 } else if (ret == INT_MAX) { /* shouldn't happen */ 53 goto fail; 54 } else { /* bigger than initial, realloc allowing for nul */ 55 len = (size_t)ret + 1; 56 if ((newstr = realloc(string, len)) == NULL) { 57 free(string); 58 goto fail; 59 } else { 60 va_end(ap2); 61 VA_COPY(ap2, ap); 62 ret = vsnprintf(newstr, len, fmt, ap2); 63 if (ret >= 0 && (size_t)ret < len) { 64 *str = newstr; 65 } else { /* failed with realloc'ed string, give up */ 66 free(newstr); 67 goto fail; 68 } 69 } 70 } 71 va_end(ap2); 72 return (ret); 73 74 fail: 75 *str = NULL; 76 errno = ENOMEM; 77 va_end(ap2); 78 return (-1); 79 } 80 #endif 81 82 #ifndef HAVE_ASPRINTF 83 int asprintf(char **str, const char *fmt, ...) 84 { 85 va_list ap; 86 int ret; 87 88 *str = NULL; 89 va_start(ap, fmt); 90 ret = vasprintf(str, fmt, ap); 91 va_end(ap); 92 93 return ret; 94 } 95 #endif 96