1 /* $OpenBSD: asprintf.c,v 1.10 2003/06/17 21:56:24 millert Exp $ */ 2 3 /* 4 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@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 #if defined(LIBC_SCCS) && !defined(lint) 20 static char rcsid[] = "$OpenBSD: asprintf.c,v 1.10 2003/06/17 21:56:24 millert Exp $"; 21 #endif /* LIBC_SCCS and not lint */ 22 23 #include <stdio.h> 24 #include <stdlib.h> 25 #include <errno.h> 26 #include <stdarg.h> 27 28 int 29 asprintf(char **str, char const *fmt, ...) 30 { 31 int ret; 32 va_list ap; 33 FILE f; 34 unsigned char *_base; 35 36 va_start(ap, fmt); 37 f._file = -1; 38 f._flags = __SWR | __SSTR | __SALC; 39 f._bf._base = f._p = (unsigned char *)malloc(128); 40 if (f._bf._base == NULL) 41 goto err; 42 f._bf._size = f._w = 127; /* Leave room for the NUL */ 43 ret = vfprintf(&f, fmt, ap); 44 if (ret == -1) 45 goto err; 46 *f._p = '\0'; 47 _base = realloc(f._bf._base, ret + 1); 48 if (_base == NULL) 49 goto err; 50 *str = (char *)_base; 51 va_end(ap); 52 return (ret); 53 54 err: 55 va_end(ap); 56 if (f._bf._base) { 57 free(f._bf._base); 58 f._bf._base = NULL; 59 } 60 *str = NULL; 61 errno = ENOMEM; 62 return (-1); 63 } 64