| | 1 | /*- |
| | 2 | * Copyright (c) 1990, 1993 |
| | 3 | * The Regents of the University of California. All rights reserved. |
| | 4 | * |
| | 5 | * This code is derived from software contributed to Berkeley by |
| | 6 | * Chris Torek. |
| | 7 | * |
| | 8 | * Copyright (c) 2011 The FreeBSD Foundation |
| | 9 | * All rights reserved. |
| | 10 | * Portions of this software were developed by David Chisnall |
| | 11 | * under sponsorship from the FreeBSD Foundation. |
| | 12 | * |
| | 13 | * Redistribution and use in source and binary forms, with or without |
| | 14 | * modification, are permitted provided that the following conditions |
| | 15 | * are met: |
| | 16 | * 1. Redistributions of source code must retain the above copyright |
| | 17 | * notice, this list of conditions and the following disclaimer. |
| | 18 | * 2. Redistributions in binary form must reproduce the above copyright |
| | 19 | * notice, this list of conditions and the following disclaimer in the |
| | 20 | * documentation and/or other materials provided with the distribution. |
| | 21 | * 3. Neither the name of the University nor the names of its contributors |
| | 22 | * may be used to endorse or promote products derived from this software |
| | 23 | * without specific prior written permission. |
| | 24 | * |
| | 25 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| | 26 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| | 27 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| | 28 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| | 29 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| | 30 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| | 31 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| | 32 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| | 33 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| | 34 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| | 35 | * SUCH DAMAGE. |
| | 36 | * |
| | 37 | * @(#)vsnprintf.c 8.1 (Berkeley) 6/4/93 |
| | 38 | * $FreeBSD: head/lib/libc/stdio/vsnprintf.c 249808 2013-04-23 13:33:13Z emaste $ |
| | 39 | */ |
| | 40 | |
| | 41 | |
| | 42 | #include <errno.h> |
| | 43 | #include <limits.h> |
| | 44 | #include <pthread.h> /* for FAKE_FILE PTHREAD_MUTEX_INITIALIZER */ |
| | 45 | #include <stdio.h> |
| | 46 | #include "local.h" |
| | 47 | #include "xlocale_private.h" |
| | 48 | |
| | 49 | int |
| | 50 | vsnprintf_l(char * __restrict str, size_t n, locale_t locale, |
| | 51 | const char * __restrict fmt, __va_list ap) |
| | 52 | { |
| | 53 | size_t on; |
| | 54 | int ret; |
| | 55 | char dummy[2]; |
| | 56 | FILE f = FAKE_FILE; |
| | 57 | FIX_LOCALE(locale); |
| | 58 | |
| | 59 | on = n; |
| | 60 | if (n != 0) |
| | 61 | n--; |
| | 62 | if (n > INT_MAX) { |
| | 63 | errno = EOVERFLOW; |
| | 64 | *str = '\0'; |
| | 65 | return (EOF); |
| | 66 | } |
| | 67 | /* Stdio internals do not deal correctly with zero length buffer */ |
| | 68 | if (n == 0) { |
| | 69 | if (on > 0) |
| | 70 | *str = '\0'; |
| | 71 | str = dummy; |
| | 72 | n = 1; |
| | 73 | } |
| | 74 | f.pub._flags = __SWR | __SSTR; |
| | 75 | f._bf._base = f.pub._p = (unsigned char *)str; |
| | 76 | f._bf._size = f.pub._w = n; |
| | 77 | ret = __vfprintf(&f, locale, fmt, ap); |
| | 78 | if (on > 0) |
| | 79 | *f.pub._p = '\0'; |
| | 80 | return (ret); |
| | 81 | } |
| | 82 | int |
| | 83 | vsnprintf(char * __restrict str, size_t n, const char * __restrict fmt, |
| | 84 | __va_list ap) |
| | 85 | { |
| | 86 | return vsnprintf_l(str, n, __get_locale(), fmt, ap); |
| | 87 | } |
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