scintilla/src/CharacterType.cxx

   1 // Scintilla source code edit control
   2 /** @file CharacterType.cxx
   3  ** Tests for character type and case-insensitive comparisons.
   4  **/
   5 // Copyright 1998-2010 by Neil Hodgson <neilh@scintilla.org>
   6 // The License.txt file describes the conditions under which this software may be distributed.
   7
   8 #include <cstdlib>
   9 #include <cassert>
  10
  11 #include "CharacterType.h"
  12
  13 using namespace Scintilla::Internal;
  14
  15 namespace Scintilla::Internal {
  16
  17 int CompareCaseInsensitive(const char *a, const char *b) noexcept {
  18         while (*a && *b) {
  19                 if (*a != *b) {
  20                         const char upperA = MakeUpperCase(*a);
  21                         const char upperB = MakeUpperCase(*b);
  22                         if (upperA != upperB)
  23                                 return upperA - upperB;
  24                 }
  25                 a++;
  26                 b++;
  27         }
  28         // Either *a or *b is nul
  29         return *a - *b;
  30 }
  31
  32 int CompareNCaseInsensitive(const char *a, const char *b, size_t len) noexcept {
  33         while (*a && *b && len) {
  34                 if (*a != *b) {
  35                         const char upperA = MakeUpperCase(*a);
  36                         const char upperB = MakeUpperCase(*b);
  37                         if (upperA != upperB)
  38                                 return upperA - upperB;
  39                 }
  40                 a++;
  41                 b++;
  42                 len--;
  43         }
  44         if (len == 0)
  45                 return 0;
  46         else
  47                 // Either *a or *b is nul
  48                 return *a - *b;
  49 }
  50
  51 }