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 /*
  14  * @implemented
  15  */
  16 int _mbsncmp(const unsigned char *str1, const unsigned char *str2, size_t n)
  17 {
  18         unsigned char *s1 = (unsigned char *)str1;
  19         unsigned char *s2 = (unsigned char *)str2;
  20
  21         unsigned short *short_s1, *short_s2;
  22
  23         int l1, l2;
  24
  25         if (n == 0)
  26                 return 0;
  27         do {
  28
  29                 if (*s1 == 0)
  30                         break;
  31
  32                 l1 = _ismbblead(*s1);
  33                 l2 = _ismbblead(*s2);
  34                 if ( !l1 &&  !l2  ) {
  35
  36                         if (*s1 != *s2)
  37                                 return *s1 - *s2;
  38                         else {
  39                                 s1 += 1;
  40                                 s2 += 1;
  41                                 n--;
  42                         }
  43                 }
  44                 else if ( l1 && l2 ){
  45                         short_s1 = (unsigned short *)s1;
  46                         short_s2 = (unsigned short *)s2;
  47                         if ( *short_s1 != *short_s2 )
  48                                 return *short_s1 - *short_s2;
  49                         else {
  50                                 s1 += 2;
  51                                 s2 += 2;
  52                                 n--;
  53
  54                         }
  55                 }
  56                 else
  57                         return *s1 - *s2;
  58         } while (n > 0);
  59         return 0;
  60 }
  61
  62 /*
  63  * @implemented
  64  */
  65 int _mbsnbcmp(const unsigned char *str1, const unsigned char *str2, size_t n)
  66 {
  67         unsigned char *s1 = (unsigned char *)str1;
  68         unsigned char *s2 = (unsigned char *)str2;
  69
  70         unsigned short *short_s1, *short_s2;
  71
  72         int l1, l2;
  73
  74         if (n == 0)
  75                 return 0;
  76         do {
  77
  78                 if (*s1 == 0)
  79                         break;
  80
  81                 l1 = _ismbblead(*s1);
  82                 l2 = _ismbblead(*s2);
  83                 if ( !l1 &&  !l2  ) {
  84
  85                         if (*s1 != *s2)
  86                                 return *s1 - *s2;
  87                         else {
  88                                 s1 += 1;
  89                                 s2 += 1;
  90                                 n--;
  91                         }
  92                 }
  93                 else if ( l1 && l2 ){
  94                         short_s1 = (unsigned short *)s1;
  95                         short_s2 = (unsigned short *)s2;
  96                         if ( *short_s1 != *short_s2 )
  97                                 return *short_s1 - *short_s2;
  98                         else {
  99                                 s1 += 2;
 100                                 s2 += 2;
 101                                 n-=2;
 102
 103                         }
 104                 }
 105                 else
 106                         return *s1 - *s2;
 107         } while (n > 0);
 108         return 0;
 109 }