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 #define INIT_SZ 128 29 30 int 31 vasprintf(char **str, const char *fmt, va_list ap) 32 { 33 int ret = -1; 34 va_list ap2; 35 char *string, *newstr; 36 size_t len; 37 38 VA_COPY(ap2, ap); 39 if ((string = malloc(INIT_SZ)) == NULL) 40 goto fail; 41 42 ret = vsnprintf(string, INIT_SZ, fmt, ap2); 43 if (ret >= 0 && ret < INIT_SZ) { /* succeeded with initial alloc */ 44 *str = string; 45 } else if (ret == INT_MAX || ret < 0) { /* Bad length */ 46 free(string); 47 goto fail; 48 } else { /* bigger than initial, realloc allowing for nul */ 49 len = (size_t)ret + 1; 50 if ((newstr = realloc(string, len)) == NULL) { 51 free(string); 52 goto fail; 53 } else { 54 va_end(ap2); 55 VA_COPY(ap2, ap); 56 ret = vsnprintf(newstr, len, fmt, ap2); 57 if (ret >= 0 && (size_t)ret < len) { 58 *str = newstr; 59 } else { /* failed with realloc'ed string, give up */ 60 free(newstr); 61 goto fail; 62 } 63 } 64 } 65 va_end(ap2); 66 return (ret); 67 68 fail: 69 *str = NULL; 70 errno = ENOMEM; 71 va_end(ap2); 72 return (-1); 73 } 74 #endif 75 76 #ifndef HAVE_ASPRINTF 77 int asprintf(char **str, const char *fmt, ...) 78 { 79 va_list ap; 80 int ret; 81 82 *str = NULL; 83 va_start(ap, fmt); 84 ret = vasprintf(str, fmt, ap); 85 va_end(ap); 86 87 return ret; 88 } 89 #endif 90