rom/utility/strnicmp.c

   1 /*
   2     Copyright © 1995-2001, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc:
   6     Lang: english
   7 */
   8 #include <exec/types.h>
   9 #include <aros/libcall.h>
  10 #include "intern.h"
  11
  12 /*****************************************************************************
  13
  14     NAME */
  15 #include <proto/utility.h>
  16
  17         AROS_LH3(LONG, Strnicmp,
  18
  19 /*  SYNOPSIS */
  20         AROS_LHA(CONST_STRPTR, string1, A0),
  21         AROS_LHA(CONST_STRPTR, string2, A1),
  22         AROS_LHA(LONG,   length,  D0),
  23
  24 /*  LOCATION */
  25         struct UtilityBase *, UtilityBase, 28, Utility)
  26
  27 /*  FUNCTION
  28         Compares two strings treating lower and upper case characters
  29         as identical up to a given maximum number of characters.
  30
  31     INPUTS
  32         string1, string2 - The strings to compare.
  33         length           - maximum number of characters to compare.
  34
  35     RESULT
  36         <0  if string1 <  string2
  37         ==0 if string1 == string2
  38         >0  if string1 >  string2
  39
  40     NOTES
  41
  42     EXAMPLE
  43
  44     BUGS
  45
  46     SEE ALSO
  47
  48     INTERNALS
  49
  50     HISTORY
  51
  52 *****************************************************************************/
  53 {
  54     AROS_LIBFUNC_INIT
  55     UBYTE c1, c2;
  56
  57     /* 0 characters are always identical */
  58     if(!length)
  59         return 0;
  60
  61     /* Loop as long as the strings are identical and valid. */
  62     do
  63     {
  64         /* Get characters, convert them to lower case. */
  65         c1=ToLower (*string1++);
  66         c2=ToLower (*string2++);
  67     }while(c1==c2&&c1&&--length);
  68
  69     /* Get result. */
  70     return (LONG)c1-(LONG)c2;
  71     AROS_LIBFUNC_EXIT
  72 } /* Strnicmp */