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      1 /*
      2  * strcasecmp.c
      3  */
      4 
      5 #include <string.h>
      6 #include <ctype.h>
      7 
      8 int strcasecmp(const char *s1, const char *s2)
      9 {
     10     const unsigned char *c1 = (const unsigned char *)s1;
     11     const unsigned char *c2 = (const unsigned char *)s2;
     12     unsigned char ch;
     13     int d = 0;
     14 
     15     while (1) {
     16 	/* toupper() expects an unsigned char (implicitly cast to int)
     17 	   as input, and returns an int, which is exactly what we want. */
     18 	d = toupper(ch = *c1++) - toupper(*c2++);
     19 	if (d || !ch)
     20 	    break;
     21     }
     22 
     23     return d;
     24 }
     25