common/alstring.cpp

   1
   2 #include "config.h"
   3
   4 #include "alstring.h"
   5
   6 #include <cctype>
   7 #include <string>
   8
   9
  10 namespace {
  11
  12 int to_upper(const char ch)
  13 {
  14     using char8_traits = std::char_traits<char>;
  15     return std::toupper(char8_traits::to_int_type(ch));
  16 }
  17
  18 } // namespace
  19
  20 namespace al {
  21
  22 int strcasecmp(const char *str0, const char *str1) noexcept
  23 {
  24     do {
  25         const int diff{to_upper(*str0) - to_upper(*str1)};
  26         if(diff < 0) return -1;
  27         if(diff > 0) return 1;
  28     } while(*(str0++) && *(str1++));
  29     return 0;
  30 }
  31
  32 int strncasecmp(const char *str0, const char *str1, std::size_t len) noexcept
  33 {
  34     if(len > 0)
  35     {
  36         do {
  37             const int diff{to_upper(*str0) - to_upper(*str1)};
  38             if(diff < 0) return -1;
  39             if(diff > 0) return 1;
  40         } while(--len && *(str0++) && *(str1++));
  41     }
  42     return 0;
  43 }
  44
  45 } // namespace al