| 1 | /* grabbag - Convenience lib for various routines common to several tools |
| 2 | * Copyright (C) 2013-2016 Xiph.org Foundation |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions |
| 6 | * are met: |
| 7 | * |
| 8 | * - Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * |
| 11 | * - Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * |
| 15 | * - Neither the name of the Xiph.org Foundation nor the names of its |
| 16 | * contributors may be used to endorse or promote products derived from |
| 17 | * this software without specific prior written permission. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 21 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 22 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR |
| 23 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 24 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 25 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 26 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 27 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 28 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 29 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | #ifdef HAVE_CONFIG_H |
| 33 | # include <config.h> |
| 34 | #endif |
| 35 | |
| 36 | #include <stdio.h> |
| 37 | #include <stdarg.h> |
| 38 | |
| 39 | #include "share/compat.h" |
| 40 | |
| 41 | /* |
| 42 | * FLAC needs to compile and work correctly on systems with a normal ISO C99 |
| 43 | * snprintf as well as Microsoft Visual Studio which has an non-standards |
| 44 | * conformant snprint_s function. |
| 45 | * |
| 46 | * The important difference occurs when the resultant string (plus string |
| 47 | * terminator) would have been longer than the supplied size parameter. When |
| 48 | * this happens, ISO C's snprintf returns the length of resultant string, but |
| 49 | * does not over-write the end of the buffer. MS's snprintf_s in this case |
| 50 | * returns -1. |
| 51 | * |
| 52 | * The _MSC_VER code below attempts to modify the return code for vsnprintf_s |
| 53 | * to something that is more compatible with the behaviour of the ISO C version. |
| 54 | */ |
| 55 | |
| 56 | int |
| 57 | flac_snprintf(char *str, size_t size, const char *fmt, ...) |
| 58 | { |
| 59 | va_list va; |
| 60 | int rc; |
| 61 | |
| 62 | #if defined _MSC_VER |
| 63 | if (size == 0) |
| 64 | return 1024; |
| 65 | #endif |
| 66 | |
| 67 | va_start (va, fmt); |
| 68 | |
| 69 | #if defined _MSC_VER |
| 70 | rc = vsnprintf_s (str, size, _TRUNCATE, fmt, va); |
| 71 | if (rc < 0) |
| 72 | rc = size - 1; |
| 73 | #elif defined __MINGW32__ |
| 74 | rc = __mingw_vsnprintf (str, size, fmt, va); |
| 75 | #else |
| 76 | rc = vsnprintf (str, size, fmt, va); |
| 77 | #endif |
| 78 | va_end (va); |
| 79 | |
| 80 | return rc; |
| 81 | } |
| 82 | |
| 83 | int |
| 84 | flac_vsnprintf(char *str, size_t size, const char *fmt, va_list va) |
| 85 | { |
| 86 | int rc; |
| 87 | |
| 88 | #if defined _MSC_VER |
| 89 | if (size == 0) |
| 90 | return 1024; |
| 91 | rc = vsnprintf_s (str, size, _TRUNCATE, fmt, va); |
| 92 | if (rc < 0) |
| 93 | rc = size - 1; |
| 94 | #elif defined __MINGW32__ |
| 95 | rc = __mingw_vsnprintf (str, size, fmt, va); |
| 96 | #else |
| 97 | rc = vsnprintf (str, size, fmt, va); |
| 98 | #endif |
| 99 | |
| 100 | return rc; |
| 101 | } |