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Power CD-ROM!! 7
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prgmming
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clipper
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chrfirst.c
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C/C++ Source or Header
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1993-10-14
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2KB
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82 lines
/*
* GT CLIPPER STANDARD HEADER
*
* File......: chrfirst.c
* Author....: Andy M Leighton
* BBS.......: The Dark Knight Returns
* Net/Node..: 050/069
* User Name.: Andy Leighton
* Date......: 23/05/93
* Revision..: 1.00
*
* This is an original work by Andy Leighton and is placed in the
* public domain.
*
* Modification history:
* ---------------------
*
* $Log$
*
*/
/*
* $DOC$
* $FUNCNAME$
* GT_CHRFIRST()
* $CATEGORY$
* String
* $ONELINER$
* Find which character occurs first in a string
* $SYNTAX$
* GT_ChrFirst(<cChars>, <cStr>) --> nAsc
* $ARGUMENTS$
* <cChars> - The set of characters to find
* <cStr> - The input string
* $RETURNS$
* nAsc - The ASCII value of the first character in <cChars>
* which appears first in <cStr>
* $DESCRIPTION$
* Return the ascii value of a character in <cChars>
* which appears first in <cStr>.
* $EXAMPLES$
*
* ? chr(GT_ChrFirst("sa ", "This is a test")) // prints "s"
* ? chr(GT_ChrFirst("et", "This is a test")) // prints "t"
*
* $END$
*/
#include "extend.h"
CLIPPER
GT_ChrFirst()
{
char *string;
char *cset;
int l1, l2;
int p1, p2;
if (ISCHAR(1) && ISCHAR(2)) {
string = _parc(2);
cset = _parc(1);
l1 = _parclen(2);
l2 = _parclen(1);
p1 = p2 = 0;
do {
for (p2 = 0; (p2 < l2) && (cset[p2] != string[p1]); ++p2)
;
if (p2 < l2) {
_retni(string[p1]);
break;
}
} while (p1++ < l1);
if (p2 >= l2)
_retni(0);
} else {
_retni(-1); // parameter mismatch - error NullStr
}
}