1 /* Copyright (c) 2004 Darren Tucker. 2 * 3 * Based originally on asprintf.c from OpenBSD: 4 * Copyright (c) 1997 Todd C. Miller <Todd.Miller AT courtesan.com> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 //extern int vsnprintf(); 20 #include <wintirpc.h> 21 #include <stdio.h> 22 #ifndef __REACTOS__ 23 #include <varargs.h> 24 #endif 25 26 /* Include vasprintf() if not on your OS. */ 27 #ifndef HAVE_VASPRINTF 28 29 #include <errno.h> 30 #include <limits.h> 31 #include <stdarg.h> 32 #include <stdlib.h> 33 34 #ifndef VA_COPY 35 # ifdef HAVE_VA_COPY 36 # define VA_COPY(dest, src) va_copy(dest, src) 37 # else 38 # ifdef HAVE___VA_COPY 39 # define VA_COPY(dest, src) __va_copy(dest, src) 40 # else 41 # define VA_COPY(dest, src) (dest) = (src) 42 # endif 43 # endif 44 #endif 45 46 #define INIT_SZ 128 47 48 int 49 vasprintf(char **str, const char *fmt, va_list ap) 50 { 51 int ret = -1; 52 va_list ap2; 53 char *string, *newstr; 54 size_t len; 55 56 VA_COPY(ap2, ap); 57 if ((string = malloc(INIT_SZ)) == NULL) 58 goto fail; 59 60 ret = _vsnprintf(string, INIT_SZ, fmt, ap2); 61 if (ret >= 0 && ret < INIT_SZ) { /* succeeded with initial alloc */ 62 *str = string; 63 } else if (ret == INT_MAX || ret < 0) { /* Bad length */ 64 goto fail; 65 } else { /* bigger than initial, realloc allowing for nul */ 66 len = (size_t)ret + 1; 67 if ((newstr = realloc(string, len)) == NULL) { 68 free(string); 69 goto fail; 70 } else { 71 va_end(ap2); 72 VA_COPY(ap2, ap); 73 ret = _vsnprintf(newstr, len, fmt, ap2); 74 if (ret >= 0 && (size_t)ret < len) { 75 *str = newstr; 76 } else { /* failed with realloc'ed string, give up */ 77 free(newstr); 78 goto fail; 79 } 80 } 81 } 82 va_end(ap2); 83 return (ret); 84 85 fail: 86 *str = NULL; 87 errno = ENOMEM; 88 va_end(ap2); 89 return (-1); 90 } 91 #endif 92 93 /* Include asprintf() if not on your OS. */ 94 #ifndef HAVE_ASPRINTF 95 int asprintf(char **str, const char *fmt, ...) 96 { 97 va_list ap; 98 int ret; 99 100 *str = NULL; 101 va_start(ap, fmt); 102 ret = vasprintf(str, fmt, ap); 103 va_end(ap); 104 105 return ret; 106 } 107 #endif 108