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

   1
   2 /*
   3  * strcasecmp.c -- compare strings, ignoring case
   4  *
   5  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   6  * COPYRIGHT file in the root directory of the nmh distribution for
   7  * complete copyright information.
   8  */
   9
  10 #include <h/mh.h>
  11
  12 /*
  13  * Our version of strcasecmp has to deal with NULL strings.
  14  * Once that is fixed in the rest of the code, we can use the
  15  * native version, instead of this one.
  16  */
  17
  18 int
  19 mh_strcasecmp (const char *s1, const char *s2)
  20 {
  21     const unsigned char *us1, *us2;
  22
  23     us1 = (const unsigned char *) s1,
  24     us2 = (const unsigned char *) s2;
  25
  26     if (!us1)
  27         us1 = "";
  28     if (!us2)
  29         us2 = "";
  30
  31     while (tolower(*us1) == tolower(*us2++))
  32         if (*us1++ == '\0')
  33             return (0);
  34     return (tolower(*us1) - tolower(*--us2));
  35 }
  36
  37
  38 int
  39 mh_strncasecmp (const char *s1, const char *s2, size_t n)
  40 {
  41     const unsigned char *us1, *us2;
  42
  43     if (n != 0) {
  44         us1 = (const unsigned char *) s1,
  45         us2 = (const unsigned char *) s2;
  46
  47         do {
  48             if (tolower(*us1) != tolower(*us2++))
  49                 return (tolower(*us1) - tolower(*--us2));
  50             if (*us1++ == '\0')
  51                 break;
  52         } while (--n != 0);
  53     }
  54     return (0);
  55 }