1 /*- 2 * Copyright (c) 2013-2015 Sandvine Inc. All rights reserved. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/param.h> 28 #include <sys/systm.h> 29 #include <sys/malloc.h> 30 31 #include <machine/stdarg.h> 32 33 int 34 vasprintf(char **buf, struct malloc_type *mtp, const char *format, va_list va) 35 { 36 int len, ret; 37 va_list tmp_va; 38 char dummy; 39 40 va_copy(tmp_va, va); 41 len = vsnprintf(&dummy, 0, format, tmp_va); 42 va_end(tmp_va); 43 if (len < 0) { 44 *buf = NULL; 45 return (len); 46 } 47 48 /* Account for null terminator. */ 49 len += 1; 50 *buf = malloc(len, mtp, M_NOWAIT); 51 if (*buf == NULL) 52 return (-1); 53 54 ret = vsnprintf(*buf, len, format, va); 55 if (ret < 0) { 56 free(*buf, mtp); 57 *buf = NULL; 58 } 59 60 return (ret); 61 } 62 63 int 64 asprintf(char **buf, struct malloc_type *mtp, const char *format, ...) 65 { 66 int ret; 67 va_list va; 68 69 va_start(va, format); 70 ret = vasprintf(buf, mtp, format, va); 71 va_end(va); 72 73 return (ret); 74 } 75