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

   1
   2 /*
   3  * strcasecmp.c -- compare strings, ignoring case
   4  *
   5  * $Id$
   6  *
   7  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   8  * COPYRIGHT file in the root directory of the nmh distribution for
   9  * complete copyright information.
  10  */
  11
  12 #include <h/mh.h>
  13
  14 /*
  15  * Our version of strcasecmp has to deal with NULL strings.
  16  * Once that is fixed in the rest of the code, we can use the
  17  * native version, instead of this one.
  18  */
  19
  20 int
  21 strcasecmp (const char *s1, const char *s2)
  22 {
  23     const unsigned char *us1, *us2;
  24
  25     us1 = (const unsigned char *) s1,
  26     us2 = (const unsigned char *) s2;
  27
  28     if (!us1)
  29         us1 = "";
  30     if (!us2)
  31         us2 = "";
  32
  33     while (tolower(*us1) == tolower(*us2++))
  34         if (*us1++ == '\0')
  35             return (0);
  36     return (tolower(*us1) - tolower(*--us2));
  37 }
  38
  39
  40 int
  41 strncasecmp (const char *s1, const char *s2, size_t n)
  42 {
  43     const unsigned char *us1, *us2;
  44
  45     if (n != 0) {
  46         us1 = (const unsigned char *) s1,
  47         us2 = (const unsigned char *) s2;
  48
  49         do {
  50             if (tolower(*us1) != tolower(*us2++))
  51                 return (tolower(*us1) - tolower(*--us2));
  52             if (*us1++ == '\0')
  53                 break;
  54         } while (--n != 0);
  55     }
  56     return (0);
  57 }