92 lines
2.2 KiB
C
92 lines
2.2 KiB
C
/*
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* GT CLIPPER STANDARD HEADER
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*
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* File......: strdiff.c
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* Author....: Andy M Leighton
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* BBS.......: The Dark Knight Returns
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* Net/Node..: 050/069
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* User Name.: Andy Leighton
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* Date......: 24/05/93
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* Revision..: 1.00
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*
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* This is an original work by Andy Leighton and is placed in the
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* public domain.
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*
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* Modification history:
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* ---------------------
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*
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* $Log$
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* Revision 1.3 1999/06/12 00:21:58 gdiet
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* ChangeLogTag:Fri Jun 11 19:14:22 1999 Gonzalo A. Diethelm <Gonzalo.Diethelm@jda.cl>
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*
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* Revision 1.2 1999/06/09 18:06:05 dholm
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* See ChangeLog entry 19990609-12:55 EDT David G. Holm <dholm@jsd-llc.com>
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*
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* Revision 1.1 1999/06/02 06:49:39 ajahja
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* Adding GT Library
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*
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*
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*/
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/*
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* $DOC$
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* $FUNCNAME$
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* GT_STRDIFF()
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* $CATEGORY$
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* String
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* $ONELINER$
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* Return a string where it begins to differ from another
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* $SYNTAX$
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* GT_StrDiff(<cStr1>, <cStr2>) --> cRet
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* $ARGUMENTS$
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* <cStr1> - A character string to compare
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* <cStr2> - The string to compare with
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* $RETURNS$
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* cRet - A string beginning at the position in <cStr2> where
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* <cStr1> begins to differ from <cStr1>
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* $DESCRIPTION$
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* Return a string beginning at the position in <cStr2> where
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* <cStr1> begins to differ from <cStr1>. If the two strings are
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* identical (or identical upto the last character in <cStr2>)
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* the function will return "".
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*
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* NOTE:
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* invalid parameters will return ""
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* $EXAMPLES$
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* ? gt_strDiff("the cat", "the rat") // prints "rat"
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* ? gt_strDiff("the cat", "the ") // prints ""
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*
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* $END$
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*/
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#include <extend.h>
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HARBOUR HB_GT_STRDIFF( void )
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{
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char *s1, *s2;
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int pos, len;
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if (ISCHAR(1) && ISCHAR(2)) {
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s1 = _parc(1);
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s2 = _parc(2);
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len = _parclen(2);
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/*
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loop through comparing both strings
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NOTE: pos starts at 1, so as to return a string index
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for CLIPPER
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*/
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for (pos = 1; (pos <= len) && (*s1 == *s2); s2++, s1++)
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pos++;
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if (pos > len) // strings match exactly!!!
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_retc((char *) NULL);
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else
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_retc(s2);
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} else {
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_ret(); // parameter mismatch - error return NIL
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}
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}
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