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 #include <stdarg.h>
  30 #include <stdio.h>
  31 #include <string.h>
  32
  33 #if HAVE(STRINGS_H)
  34 #include <strings.h>
  35 #endif
  36
  37 #if COMPILER(MSVC)
  38 // FIXME: why a COMPILER check instead of OS? also, these should be HAVE checks
  39
  40 inline int snprintf(char* buffer, size_t count, const char* format, ...)
  41 {
  42     int result;
  43     va_list args;
  44     va_start(args, format);
  45     result = _vsnprintf(buffer, count, format, args);
  46     va_end(args);
  47
  48     // In the case where the string entirely filled the buffer, _vsnprintf will not
  49     // null-terminate it, but snprintf must.
  50     if (count > 0)
  51         buffer[count - 1] = '\0';
  52
  53     return result;
  54 }
  55
  56 inline double wtf_vsnprintf(char* buffer, size_t count, const char* format, va_list args)
  57 {
  58     int result = _vsnprintf(buffer, count, format, args);
  59
  60     // In the case where the string entirely filled the buffer, _vsnprintf will not
  61     // null-terminate it, but vsnprintf must.
  62     if (count > 0)
  63         buffer[count - 1] = '\0';
  64
  65     return result;
  66 }
  67
  68 // Work around a difference in Microsoft's implementation of vsnprintf, where
  69 // vsnprintf does not null terminate the buffer. WebKit can rely on the null termination.
  70 #define vsnprintf(buffer, count, format, args) wtf_vsnprintf(buffer, count, format, args)
  71
  72 #if OS(WINCE)
  73
  74 inline int strnicmp(const char* string1, const char* string2, size_t count)
  75 {
  76     return _strnicmp(string1, string2, count);
  77 }
  78
  79 inline int stricmp(const char* string1, const char* string2)
  80 {
  81     return _stricmp(string1, string2);
  82 }
  83
  84 inline char* strdup(const char* strSource)
  85 {
  86     return _strdup(strSource);
  87 }
  88
  89 #endif
  90
  91 inline int strncasecmp(const char* s1, const char* s2, size_t len)
  92 {
  93     return _strnicmp(s1, s2, len);
  94 }
  95
  96 inline int strcasecmp(const char* s1, const char* s2)
  97 {
  98     return _stricmp(s1, s2);
  99 }
 100
 101 #endif
 102
 103 #if !HAVE(STRNSTR)
 104
 105 inline char* strnstr(const char* buffer, const char* target, size_t bufferLength)
 106 {
 107     size_t targetLength = strlen(target);
 108     if (targetLength == 0)
 109         return const_cast<char*>(buffer);
 110     for (const char* start = buffer; *start && start + targetLength <= buffer + bufferLength; start++) {
 111         if (*start == *target && strncmp(start + 1, target + 1, targetLength - 1) == 0)
 112             return const_cast<char*>(start);
 113     }
 114     return 0;
 115 }
 116
 117 #endif
 118
 119 #if COMPILER(RVCT) && __ARMCC_VERSION < 400000
 120
 121 int strcasecmp(const char* s1, const char* s2);
 122 int strncasecmp(const char* s1, const char* s2, size_t len);
 123
 124 #endif
 125
 126 #endif // WTF_StringExtras_h