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00001 /*
00002  * COPYRIGHT:   See COPYING in the top level directory
00003  * PROJECT:     ReactOS system libraries
00004  * FILE:        lib/msvcrt/mbstring/mbsncmp.c
00005  * PURPOSE:     Compares two strings to a maximum of n bytes or characters
00006  * PROGRAMER:   Ariadne
00007  * UPDATE HISTORY:
00008  *              12/04/99: Created
00009  */
00010 
00011 #include <mbstring.h>
00012 
00013 /*
00014  * @implemented
00015  */
00016 int _mbsncmp(const unsigned char *str1, const unsigned char *str2, size_t n)
00017 {
00018     unsigned char *s1 = (unsigned char *)str1;
00019     unsigned char *s2 = (unsigned char *)str2;
00020 
00021     unsigned short *short_s1, *short_s2;
00022 
00023     int l1, l2;
00024 
00025     if (n == 0)
00026         return 0;
00027     do {
00028 
00029         if (*s1 == 0)
00030             break;
00031 
00032         l1 = _ismbblead(*s1);
00033         l2 = _ismbblead(*s2);
00034         if ( !l1 &&  !l2  ) {
00035 
00036             if (*s1 != *s2)
00037                 return *s1 - *s2;
00038             else {
00039                 s1 += 1;
00040                 s2 += 1;
00041                 n--;
00042             }
00043         }
00044         else if ( l1 && l2 ){
00045             short_s1 = (unsigned short *)s1;
00046             short_s2 = (unsigned short *)s2;
00047             if ( *short_s1 != *short_s2 )
00048                 return *short_s1 - *short_s2;
00049             else {
00050                 s1 += 2;
00051                 s2 += 2;
00052                 n--;
00053 
00054             }
00055         }
00056         else
00057             return *s1 - *s2;
00058     } while (n > 0);
00059     return 0;
00060 }
00061 
00062 /*
00063  * @implemented
00064  */
00065 int _mbsnbcmp(const unsigned char *str1, const unsigned char *str2, size_t n)
00066 {
00067     unsigned char *s1 = (unsigned char *)str1;
00068     unsigned char *s2 = (unsigned char *)str2;
00069 
00070     unsigned short *short_s1, *short_s2;
00071 
00072     int l1, l2;
00073 
00074     if (n == 0)
00075         return 0;
00076     do {
00077 
00078         if (*s1 == 0)
00079             break;
00080 
00081         l1 = _ismbblead(*s1);
00082         l2 = _ismbblead(*s2);
00083         if ( !l1 &&  !l2  ) {
00084 
00085             if (*s1 != *s2)
00086                 return *s1 - *s2;
00087             else {
00088                 s1 += 1;
00089                 s2 += 1;
00090                 n--;
00091             }
00092         }
00093         else if ( l1 && l2 ){
00094             short_s1 = (unsigned short *)s1;
00095             short_s2 = (unsigned short *)s2;
00096             if ( *short_s1 != *short_s2 )
00097                 return *short_s1 - *short_s2;
00098             else {
00099                 s1 += 2;
00100                 s2 += 2;
00101                 n-=2;
00102 
00103             }
00104         }
00105         else
00106             return *s1 - *s2;
00107     } while (n > 0);
00108     return 0;
00109 }
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