89 lines
2.1 KiB
C
89 lines
2.1 KiB
C
/*
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* GT CLIPPER STANDARD HEADER
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*
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* File......: atdiff.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......: 23/05/93
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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 1.2 1999/06/09 18:06:03 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 06:18:45 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_ATDIFF()
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* $CATEGORY$
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* String
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* $ONELINER$
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* Return the position where two strings begin to differ
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* $SYNTAX$
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* GT_AtDiff(<cStr1>, <cStr2>) --> nPos
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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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* nPos - The position in <cStr2> where <cStr1> begins to differ
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* $DESCRIPTION$
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* Return the position in <cStr2> where <cStr1> begins to differ.
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* If the strings differ in the first character GT_AtDiff() will
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* return 1. If the two strings are identical (or identical upto
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* the last character in <cStr2>) the function will return 0.
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*
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* NOTE:
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* invalid parameters will return -1
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* $EXAMPLES$
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* ? gt_atDiff("the cat", "the rat") // prints 5
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* ? gt_atDiff("the cat", "the ") // prints 0
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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 GT_ATDIFF( 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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_retni(0);
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else
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_retni(pos);
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} else {
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_retni(-1); // parameter mismatch - error -1
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}
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}
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