pggyak kzh 1

pggyak-kzh-1.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char *filter(char *source, char *haystack) {
	int i,j;
	int nlen, cur, filter_flag;
	char *nstr;	
	
	nlen = 0;
	for (i = 0; source[i]; i++) {
		for (j = 0; haystack[j]; j++) {
			if (source[i] == haystack[j]) {
				nlen++;
				break;	
				/* elhagyhato, ha feltetlelzzuk, 
				 hogy a haystack unique karakterekbol all */
			}
		}
	}
	nlen++; //closing 0
	
	nstr = (char *)malloc(nlen *sizeof(char));
	if (nstr == NULL) { return NULL; }
	
	cur = 0;
	filter_flag = 0;
	for (i = 0; source[i]; i++) {
		for (j = 0; haystack[j]; j++) {
			if (source[i] == haystack[j]) {
				filter_flag = 1;
				break;	//elhagyhato
			}
		}
		
		if (!filter_flag) {
			nstr[cur] = source[i];
			cur++;
		}
		filter_flag = 0;
	}
	
	nstr[cur] = 0;
	
	return nstr;
}

int main() {
	char *str;
	
	str = filter("fooobar", "ob");
	
	printf("%s", str);
	
	free(str);
	str= NULL;

    return 0;
}