com32/lib/strncasecmp.c

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