1 /* $OpenBSD: vasprintf.c,v 1.13 2006/01/06 18:53:04 millert Exp $ */ 2 3 /* 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 #include <stdio.h> 20 #include <stdlib.h> 21 #include <string.h> 22 #include <errno.h> 23 #include "local.h" 24 25 int 26 vasprintf(char **str, const char *fmt, __va_list ap) 27 { 28 int ret; 29 FILE f; 30 struct __sfileext fext; 31 unsigned char *_base; 32 33 _FILEEXT_SETUP(&f, &fext); 34 f._file = -1; 35 f._flags = __SWR | __SSTR | __SALC; 36 f._bf._base = f._p = (unsigned char *)malloc(128); 37 if (f._bf._base == NULL) 38 goto err; 39 f._bf._size = f._w = 127; /* Leave room for the NUL */ 40 ret = vfprintf(&f, fmt, ap); 41 if (ret == -1) 42 goto err; 43 *f._p = '\0'; 44 _base = realloc(f._bf._base, ret + 1); 45 if (_base == NULL) 46 goto err; 47 *str = (char *)_base; 48 return (ret); 49 50 err: 51 if (f._bf._base) { 52 free(f._bf._base); 53 f._bf._base = NULL; 54 } 55 *str = NULL; 56 errno = ENOMEM; 57 return (-1); 58 } 59
