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Power CD-ROM!! 7
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prgmming
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clipper
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strcount.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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88 lines
/*
* GT CLIPPER STANDARD HEADER
*
* File......: strcount.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_STRCOUNT()
* $CATEGORY$
* String
* $ONELINER$
* Count the number of times a substring appears in a string
* $SYNTAX$
* GT_StrCount(<cChrs>, <cStr>) --> nFreq
* $ARGUMENTS$
* <cChrs> - The substring to find the frequence of
* <cStr> - The string in which to find the character
* $RETURNS$
* nFreq - The number of times <cChrs> occurs in <cStr>
* $DESCRIPTION$
* GT_StrCount() counts how many times a specified substring
* appears in a string.
* If the substring does NOT appear in <cStr> this function
* will return 0.
* If the substring is a single character use GT_ChrCount() as
* it will be faster.
*
* NOTE:
* invalid parameters will return -1
* $EXAMPLES$
*
* ? GT_StrCount("the", "the cat sat on the mat") // prints 2
*
* $END$
*/
#include "extend.h"
CLIPPER
gt_strcount()
{
char *s1, *s2;
int count, p1, p2, l1, l2;
int match = 1;
if (ISCHAR(1) && ISCHAR(2)) {
s1 = _parc(1);
s2 = _parc(2);
l1 = _parclen(1);
l2 = _parclen(2);
/* loop through s2 matching passed character (s1) with
each character of s1 */
for (count = 0, p2 = 0; p2 <= (l2 - l1); p2++) {
match = 1;
for (p1 = 0; p1 < l1; p1++) {
if (s1[p1] != s2[p2 + p1])
match = 0;
}
if (match)
count++;
}
_retni(count); // return result
} else {
_retni(-1); // parameter mismatch - error -1
}
}