94 lines
2.1 KiB
C
94 lines
2.1 KiB
C
/*
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* GT CLIPPER STANDARD HEADER
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*
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* File......: strleft.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 1.3 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 06:49:40 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_STRLEFT()
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* $CATEGORY$
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* String
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* $ONELINER$
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* Find length of prefix of a string
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* $SYNTAX$
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* GT_StrLeft(<cStr>, <cChars>) --> nLen
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* $ARGUMENTS$
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* <cStr> - The input string
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* <cChars> - The set of characters to find
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* $RETURNS$
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* nLen - The length of the prefix found.
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* $DESCRIPTION$
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* Return the length of the leading segment in the passed string
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* <cStr> that consists solely of the characters in the character
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* set <cChars>.
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*
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* If no characters in the the search set are found, the function
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* shall return 0
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* $EXAMPLES$
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*
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* ? GT_StrLeft("this is a test", "hsit ") // prints 8
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* ? GT_StrLeft("this is a test", "hit a") // prints 3
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* ? GT_StrLeft("this is a test", "zxy") // 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 HB_GT_STRLEFT( void )
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{
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char *string;
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char *cset;
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int l1, l2;
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int p1, p2;
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if (ISCHAR(1) && ISCHAR(2)) {
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string = _parc(1);
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cset = _parc(2);
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l1 = _parclen(1);
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l2 = _parclen(2);
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p1 = p2 = 0;
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for (p1 = 0; p1 < l1; p1++) {
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for (p2 = 0; p2 < l2 && cset[p2] != string[p1]; p2++)
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;
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if (p2 == l2)
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break;
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}
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_retni(p1);
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} else {
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_retni(-1); // parameter mismatch - error NullStr
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}
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}
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