lib/crtdll/mbstring/mbsncmp.c

   1 /*
   2  * COPYRIGHT:   See COPYING in the top level directory
   3  * PROJECT:     ReactOS system libraries
   4  * FILE:        lib/crtdll/mbstring/mbsncmp.c
   5  * PURPOSE:     Compares two strings to a maximum of n bytes or characters
   6  * PROGRAMER:   Boudewijn Dekker
   7  * UPDATE HISTORY:
   8  *              12/04/99: Created
   9  */
  10
  11 #include <msvcrt/mbstring.h>
  12
  13 int _mbsncmp(const unsigned char *str1, const unsigned char *str2, size_t n)
  14 {
  15         unsigned char *s1 = (unsigned char *)str1;
  16         unsigned char *s2 = (unsigned char *)str2;
  17
  18         unsigned short *short_s1, *short_s2;
  19
  20         int l1, l2;
  21
  22         if (n == 0)
  23                 return 0;
  24         do {
  25
  26                 if (*s1 == 0)
  27                         break;
  28
  29                 l1 = _ismbblead(*s1);
  30                 l2 = _ismbblead(*s2);
  31                 if ( !l1 &&  !l2  ) {
  32
  33                         if (*s1 != *s2)
  34                                 return *s1 - *s2;
  35                         else {
  36                                 s1 += 1;
  37                                 s2 += 1;
  38                                 n--;
  39                         }
  40                 }
  41                 else if ( l1 && l2 ){
  42                         short_s1 = (unsigned short *)s1;
  43                         short_s2 = (unsigned short *)s2;
  44                         if ( *short_s1 != *short_s2 )
  45                                 return *short_s1 - *short_s2;
  46                         else {
  47                                 s1 += 2;
  48                                 s2 += 2;
  49                                 n--;
  50
  51                         }
  52                 }
  53                 else
  54                         return *s1 - *s2;
  55         } while (n > 0);
  56         return 0;
  57 }
  58
  59 int _mbsnbcmp(const unsigned char *str1, const unsigned char *str2, size_t n)
  60 {
  61         unsigned char *s1 = (unsigned char *)str1;
  62         unsigned char *s2 = (unsigned char *)str2;
  63
  64         unsigned short *short_s1, *short_s2;
  65
  66         int l1, l2;
  67
  68         if (n == 0)
  69                 return 0;
  70         do {
  71
  72                 if (*s1 == 0)
  73                         break;
  74
  75                 l1 = _ismbblead(*s1);
  76                 l2 = _ismbblead(*s2);
  77                 if ( !l1 &&  !l2  ) {
  78
  79                         if (*s1 != *s2)
  80                                 return *s1 - *s2;
  81                         else {
  82                                 s1 += 1;
  83                                 s2 += 1;
  84                                 n--;
  85                         }
  86                 }
  87                 else if ( l1 && l2 ){
  88                         short_s1 = (unsigned short *)s1;
  89                         short_s2 = (unsigned short *)s2;
  90                         if ( *short_s1 != *short_s2 )
  91                                 return *short_s1 - *short_s2;
  92                         else {
  93                                 s1 += 2;
  94                                 s2 += 2;
  95                                 n-=2;
  96
  97                         }
  98                 }
  99                 else
 100                         return *s1 - *s2;
 101         } while (n > 0);
 102         return 0;
 103 }