external/ibm-public/postfix/dist/src/util/lowercase.c

   1 /*      $NetBSD$        */
   2
   3 /*++
   4 /* NAME
   5 /*      lowercase 3
   6 /* SUMMARY
   7 /*      map uppercase characters to lowercase
   8 /* SYNOPSIS
   9 /*      #include <stringops.h>
  10 /*
  11 /*      char    *lowercase(buf)
  12 /*      char    *buf;
  13 /* DESCRIPTION
  14 /*      lowercase() replaces uppercase characters in its null-terminated
  15 /*      input by their lowercase equivalent.
  16 /* LICENSE
  17 /* .ad
  18 /* .fi
  19 /*      The Secure Mailer license must be distributed with this software.
  20 /* AUTHOR(S)
  21 /*      Wietse Venema
  22 /*      IBM T.J. Watson Research
  23 /*      P.O. Box 704
  24 /*      Yorktown Heights, NY 10598, USA
  25 /*--*/
  26
  27 /* System library. */
  28
  29 #include "sys_defs.h"
  30 #include <ctype.h>
  31
  32 /* Utility library. */
  33
  34 #include "stringops.h"
  35
  36 char   *lowercase(char *string)
  37 {
  38     char   *cp;
  39     int     ch;
  40
  41     for (cp = string; (ch = *cp) != 0; cp++)
  42         if (ISUPPER(ch))
  43             *cp = TOLOWER(ch);
  44     return (string);
  45 }