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
flac_snprintf(char * str,size_t size,const char * fmt,...)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
flac_vsnprintf(char * str,size_t size,const char * fmt,va_list va)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 }
102