1/*
2 * Copyright (C) 2006, 2010 Apple Inc. All rights reserved.
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 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef WTF_StringExtras_h
27#define WTF_StringExtras_h
28
29#if OS(POSIX)
30#define HAVE_STRINGS_H 1
31#endif
32
33#if !defined(HAVE_STRNSTR)
34#if OS(MACOSX) || (OS(FREEBSD) && !defined(__GLIBC__))
35#define HAVE_STRNSTR 1
36#endif
37#endif
38
39#include <stdarg.h>
40#include <stdio.h>
41#include <string.h>
42
43#if HAVE(STRINGS_H)
44#include <strings.h>
45#endif
46
47#if COMPILER(MSVC)
48// FIXME: why a COMPILER check instead of OS? also, these should be HAVE checks
49
50inline int snprintf(char* buffer, size_t count, const char* format, ...)
51{
52    int result;
53    va_list args;
54    va_start(args, format);
55    result = _vsnprintf(buffer, count, format, args);
56    va_end(args);
57
58    // In the case where the string entirely filled the buffer, _vsnprintf will not
59    // null-terminate it, but snprintf must.
60    if (count > 0)
61        buffer[count - 1] = '\0';
62
63    return result;
64}
65
66inline double wtf_vsnprintf(char* buffer, size_t count, const char* format, va_list args)
67{
68    int result = _vsnprintf(buffer, count, format, args);
69
70    // In the case where the string entirely filled the buffer, _vsnprintf will not
71    // null-terminate it, but vsnprintf must.
72    if (count > 0)
73        buffer[count - 1] = '\0';
74
75    return result;
76}
77
78// Work around a difference in Microsoft's implementation of vsnprintf, where
79// vsnprintf does not null terminate the buffer. WebKit can rely on the null termination.
80#define vsnprintf(buffer, count, format, args) wtf_vsnprintf(buffer, count, format, args)
81
82inline int strncasecmp(const char* s1, const char* s2, size_t len)
83{
84    return _strnicmp(s1, s2, len);
85}
86
87inline int strcasecmp(const char* s1, const char* s2)
88{
89    return _stricmp(s1, s2);
90}
91
92#endif
93
94#if !HAVE(STRNSTR)
95
96inline char* strnstr(const char* buffer, const char* target, size_t bufferLength)
97{
98    size_t targetLength = strlen(target);
99    if (targetLength == 0)
100        return const_cast<char*>(buffer);
101    for (const char* start = buffer; *start && start + targetLength <= buffer + bufferLength; start++) {
102        if (*start == *target && strncmp(start + 1, target + 1, targetLength - 1) == 0)
103            return const_cast<char*>(start);
104    }
105    return 0;
106}
107
108#endif
109
110#endif // WTF_StringExtras_h
111