自己实现strncasecmp

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自己实现 int strncasecmp(const char *s1, const char *s2, int n) { #define DIFF_VALUE ('a' - 'A') #define STRNCASECMP_FALSE ('z' - 'A')     int ch1 = 0;     int ch2 = 0;     int index = 0;       if (NULL == s1 || NULL == s2 || 0 > n) {         return STRNCASECMP_FALSE;     }       if (0 == n) {         return 0;     }       for (index = 0; index < n ; index++)     {         if((ch1 = *(unsigned char *)s1++) >= 'A' && (ch1 <= 'Z')) {             ch1 += DIFF_VALUE;         }         if((ch2 = *(unsigned char *)s2++) >= 'A' && (ch2 <= 'Z')) {             ch2 += DIFF_VALUE;         }         //printf("index=%u, ch1=%c, ch2=%c\r\n", index, ch1, ch2);           if ('\0' == ch1 || ch1 != ch2) {             break;         }     } ;       return ch1 - ch2; }

　　摘自并整理：http://www.voidcn.com/article/p-acjqpctj-oc.html