Count "abcabc" in string

gistfile1.c

#include <stdio.h>

int countabcabc(char *string);

char match[] = "abcabc";

int main()
{
	char string[] = "abcabcabc";
	char string2[] = "abcabc22abcababcabcabc";

	printf("%d\n", countabcabc(string));
	printf("%d\n", countabcabc(string2));
}

int countabcabc(char *string)
{
	int state = 0;
	int count = 0;
	char *pos;
	for(pos = string; *pos; pos++)
	{
		state = state + (match[state] == *pos) - (match[state] != *pos) * state + (match[state] != *pos) * (match[0] == *pos);
		count = count + state / 6;
		state = state - state / 6 * 3;
	}
	return count;
}