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 #include <errno.h> 25 #include <stdarg.h> 26 #include <stdlib.h> 27 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 42 int vasprintf(char **str, const char *fmt, va_list ap) 43 { 44 int ret = -1; 45 va_list ap2; 46 char *string, *newstr; 47 size_t len; 48 49 VA_COPY(ap2, ap); 50 if ((string = malloc(INIT_SZ)) == NULL) 51 goto fail; 52 53 ret = vsnprintf(string, INIT_SZ, fmt, ap2); 54 if (ret >= 0 && ret < INIT_SZ) { /* succeeded with initial alloc */ 55 *str = string; 56 } else if (ret == INT_MAX) { /* shouldn't happen */ 57 goto fail; 58 } else { /* bigger than initial, realloc allowing for nul */ 59 len = (size_t)ret + 1; 60 if ((newstr = realloc(string, len)) == NULL) { 61 free(string); 62 goto fail; 63 } else { 64 va_end(ap2); 65 VA_COPY(ap2, ap); 66 ret = vsnprintf(newstr, len, fmt, ap2); 67 if (ret >= 0 && (size_t)ret < len) { 68 *str = newstr; 69 } else { /* failed with realloc'ed string, give up */ 70 free(newstr); 71 goto fail; 72 } 73 } 74 } 75 va_end(ap2); 76 return (ret); 77 78 fail: 79 *str = NULL; 80 errno = ENOMEM; 81 va_end(ap2); 82 return (-1); 83 } 84 #endif 85 86 #ifndef HAVE_ASPRINTF 87 int asprintf(char **str, const char *fmt, ...) 88 { 89 va_list ap; 90 int ret; 91 92 *str = NULL; 93 va_start(ap, fmt); 94 ret = vasprintf(str, fmt, ap); 95 va_end(ap); 96 97 return ret; 98 } 99 #endif 100