diplodocus.org Git - nmh/blob - sbr/strcasecmp.c

   1
   2 /*
   3  * strcasecmp.c -- compare strings, ignoring case
   4  *
   5  * $Id$
   6  */
   7
   8 #include <h/mh.h>
   9
  10 /*
  11  * Our version of strcasecmp has to deal with NULL strings.
  12  * Once that is fixed in the rest of the code, we can use the
  13  * native version, instead of this one.
  14  */
  15
  16 int
  17 strcasecmp (const char *s1, const char *s2)
  18 {
  19     const unsigned char *us1, *us2;
  20
  21     us1 = (const unsigned char *) s1,
  22     us2 = (const unsigned char *) s2;
  23
  24     if (!us1)
  25         us1 = "";
  26     if (!us2)
  27         us2 = "";
  28
  29     while (tolower(*us1) == tolower(*us2++))
  30         if (*us1++ == '\0')
  31             return (0);
  32     return (tolower(*us1) - tolower(*--us2));
  33 }
  34
  35
  36 int
  37 strncasecmp (const char *s1, const char *s2, size_t n)
  38 {
  39     const unsigned char *us1, *us2;
  40
  41     if (n != 0) {
  42         us1 = (const unsigned char *) s1,
  43         us2 = (const unsigned char *) s2;
  44
  45         do {
  46             if (tolower(*us1) != tolower(*us2++))
  47                 return (tolower(*us1) - tolower(*--us2));
  48             if (*us1++ == '\0')
  49                 break;
  50         } while (--n != 0);
  51     }
  52     return (0);
  53 }