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 #pragma ident "%Z%%M% %I% %E% SMI" 21 22 #include "includes.h" 23 24 #ifndef HAVE_VASPRINTF 25 26 #include <errno.h> 27 #include <stdarg.h> 28 #include <stdlib.h> 29 30 #ifndef VA_COPY 31 #ifdef HAVE_VA_COPY 32 #define VA_COPY(dest, src) va_copy(dest, src) 33 #else 34 #ifdef HAVE___VA_COPY 35 #define VA_COPY(dest, src) __va_copy(dest, src) 36 #else 37 #define VA_COPY(dest, src) (dest) = (src) 38 #endif 39 #endif 40 #endif 41 42 #define INIT_SZ 128 43 44 int 45 vasprintf(char **str, const char *fmt, va_list ap) 46 { 47 int ret = -1; 48 va_list ap2; 49 char *string, *newstr; 50 size_t len; 51 52 VA_COPY(ap2, ap); 53 if ((string = malloc(INIT_SZ)) == NULL) 54 goto fail; 55 56 ret = vsnprintf(string, INIT_SZ, fmt, ap2); 57 if (ret >= 0 && ret < INIT_SZ) { /* succeeded with initial alloc */ 58 *str = string; 59 } else if (ret == INT_MAX || ret < 0) { /* Bad length */ 60 free(string); 61 goto fail; 62 } else { /* bigger than initial, realloc allowing for nul */ 63 len = (size_t)ret + 1; 64 if ((newstr = realloc(string, len)) == NULL) { 65 free(string); 66 goto fail; 67 } else { 68 va_end(ap2); 69 VA_COPY(ap2, ap); 70 ret = vsnprintf(newstr, len, fmt, ap2); 71 if (ret >= 0 && (size_t)ret < len) { 72 *str = newstr; 73 } else { /* failed with realloc'ed string, give up */ 74 free(newstr); 75 goto fail; 76 } 77 } 78 } 79 va_end(ap2); 80 return (ret); 81 82 fail: 83 *str = NULL; 84 errno = ENOMEM; 85 va_end(ap2); 86 return (-1); 87 } 88 #endif 89 90 #ifndef HAVE_ASPRINTF 91 int 92 asprintf(char **str, const char *fmt, ...) 93 { 94 va_list ap; 95 int ret; 96 97 *str = NULL; 98 va_start(ap, fmt); 99 ret = vasprintf(str, fmt, ap); 100 va_end(ap); 101 102 return (ret); 103 } 104 #endif 105