83 lines
1.7 KiB
C
83 lines
1.7 KiB
C
/*
|
|
* $Id$
|
|
*/
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* $DOC$
|
|
* $FUNCNAME$
|
|
* 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>
|
|
|
|
|
|
HARBOUR HB_GT_STRLEFT( void )
|
|
{
|
|
char *string;
|
|
char *cset;
|
|
int l1, l2;
|
|
int p1, p2;
|
|
|
|
if (ISCHAR(1) && ISCHAR(2)) {
|
|
string = hb_parc(1);
|
|
cset = hb_parc(2);
|
|
l1 = hb_parclen(1);
|
|
l2 = hb_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;
|
|
}
|
|
hb_retni(p1);
|
|
|
|
} else {
|
|
hb_retni(-1); /* parameter mismatch - error NullStr */
|
|
}
|
|
}
|
|
|