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

const char *my_strtok(const char *haystack, const char *needle) {
	static const char *_haystack;
	static char _buffer[1024];

	char *pos;
	unsigned int needlelen;

	_buffer[1023] = '\0';

	if (haystack) {
		_haystack = haystack;
	}
	if (!_haystack || !*_haystack) {
		return NULL;
	}
	if (!needle || !*needle) {
		return _haystack;
	}

	needlelen = strlen(needle);

	pos = strstr(_haystack, needle);

	while (pos == _haystack) {
		_haystack += needlelen;
		pos = strstr(_haystack, needle);
	}

	if (!*_haystack) {
		_haystack = NULL;
		return NULL;
	}
	if (!pos) {
		strncpy(_buffer, _haystack, 1023);
		_haystack = NULL;
	} else {
		unsigned int length = pos - _haystack;

		if (length > 1023)
			length = 1023;

		strncpy(_buffer, _haystack, length);
		_haystack += length + needlelen;
	}

	return _buffer;
}

int main(int argc, char **argv) {
	char *plop = argv[1];
	const char *bar;

	while ((bar = my_strtok(plop, "a"))) {
		plop = NULL;

		printf("%s\n", bar);
	}
	plop = argv[1];
	while ((bar = strtok(plop, "a"))) {
		plop = NULL;

		printf("%s\n", bar);
	}

	return 0;
}