third_party/WebKit/Source/wtf/StringExtras.h

   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
  50 #if _MSC_VER < 1900
  51 // snprintf is implemented in VS 2015
  52 inline int snprintf(char* buffer, size_t count, const char* format, ...)
  53 {
  54     int result;
  55     va_list args;
  56     va_start(args, format);
  57     result = _vsnprintf(buffer, count, format, args);
  58     va_end(args);
  59
  60     // In the case where the string entirely filled the buffer, _vsnprintf will not
  61     // null-terminate it, but snprintf must.
  62     if (count > 0)
  63         buffer[count - 1] = '\0';
  64
  65     return result;
  66 }
  67
  68 inline double wtf_vsnprintf(char* buffer, size_t count, const char* format, va_list args)
  69 {
  70     int result = _vsnprintf(buffer, count, format, args);
  71
  72     // In the case where the string entirely filled the buffer, _vsnprintf will not
  73     // null-terminate it, but vsnprintf must.
  74     if (count > 0)
  75         buffer[count - 1] = '\0';
  76
  77     return result;
  78 }
  79
  80 // Work around a difference in Microsoft's implementation of vsnprintf, where
  81 // vsnprintf does not null terminate the buffer. WebKit can rely on the null
  82 // termination. Microsoft's implementation is fixed in VS 2015.
  83 #define vsnprintf(buffer, count, format, args) wtf_vsnprintf(buffer, count, format, args)
  84 #endif
  85
  86 inline int strncasecmp(const char* s1, const char* s2, size_t len)
  87 {
  88     return _strnicmp(s1, s2, len);
  89 }
  90
  91 inline int strcasecmp(const char* s1, const char* s2)
  92 {
  93     return _stricmp(s1, s2);
  94 }
  95
  96 #endif
  97
  98 #if !HAVE(STRNSTR)
  99
 100 inline char* strnstr(const char* buffer, const char* target, size_t bufferLength)
 101 {
 102     size_t targetLength = strlen(target);
 103     if (targetLength == 0)
 104         return const_cast<char*>(buffer);
 105     for (const char* start = buffer; *start && start + targetLength <= buffer + bufferLength; start++) {
 106         if (*start == *target && strncmp(start + 1, target + 1, targetLength - 1) == 0)
 107             return const_cast<char*>(start);
 108     }
 109     return 0;
 110 }
 111
 112 #endif
 113
 114 #endif // WTF_StringExtras_h