Thread: Segmentation fault: Cannot access memory at address

This is my code:

Code:

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

int parse_string (const char *s1, char *s2) {
	int pos = 0;
	while ( (*s1 != '\0') || (*s1 != '\t') ) {
		*s2 = *s1;
		s2++;
		s1++;
		pos++;
	}
	*s2 = '\0';
	return pos;
}

int main() {
	FILE *ptr;
	int index;
	printf ("We're going to read the first five entries in pkg-config:\n");
	ptr = popen ("pkg-config --list-all", "r");
	char line[LINE_MAX];
	index = 0;
	while ( (index <= 5) && (fgets(line, LINE_MAX, ptr) != NULL) ) {
		char *tmp = malloc (LINE_MAX);
		parse_string (line, tmp);
		printf ("%s", tmp);
		free (tmp);
		index++;
	}
	fclose (ptr);
	return 0;
}

I'm trying to read the first entries and remove the tab character, but it gives me Segmentation fault, any ideas?