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Power CD-ROM!! 7
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prgmming
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clipper
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strleft.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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86 lines
/*
* GT CLIPPER STANDARD HEADER
*
* File......: strleft.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_STRLEFT()
* $CATEGORY$
* String
* $ONELINER$
* Find length of prefix of a string
* $SYNTAX$
* GT_StrLeft(<cStr>, <cChars>) --> nLen
* $ARGUMENTS$
* <cStr> - The input string
* <cChars> - The set of characters to find
* $RETURNS$
* nLen - The length of the prefix found.
* $DESCRIPTION$
* Return the length of the leading segment in the passed string
* <cStr> that consists solely of the characters in the character
* set <cChars>.
*
* If no characters in the the search set are found, the function
* shall return 0
* $EXAMPLES$
*
* ? GT_StrLeft("this is a test", "hsit ") // prints 8
* ? GT_StrLeft("this is a test", "hit a") // prints 3
* ? GT_StrLeft("this is a test", "zxy") // prints 0
*
* $END$
*/
#include "extend.h"
CLIPPER
GT_StrLeft()
{
char *string;
char *cset;
int l1, l2;
int p1, p2;
if (ISCHAR(1) && ISCHAR(2)) {
string = _parc(1);
cset = _parc(2);
l1 = _parclen(1);
l2 = _parclen(2);
p1 = p2 = 0;
for (p1 = 0; p1 < l1; p1++) {
for (p2 = 0; p2 < l2 && cset[p2] != string[p1]; p2++)
;
if (p2 == l2)
break;
}
_retni(p1);
} else {
_retni(-1); // parameter mismatch - error NullStr
}
}