#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>

int main(int argc, char *argv[])
{
	char *filename;

	if (argc < 2) {
		printf("arg: filename.\n");
		return -1;
	}

	filename = argv[1];
	printf("test on %s.\n", filename);

	int fd = open(filename, O_RDWR);

	if (fd < 0) {
		perror("open");
		return -1;
	}

	int count = 0;

	while (1) {
		ssize_t ret;
		char buf;

		ret = read(fd, &buf, sizeof(buf));
		if (ret < 0) {
			perror("READ");
			return -1;
		}

		if (ret == 0)
			break;
		if (ret != sizeof(buf)) {
			printf("Count %x Ret %lx sizeof(buf) %lx.\n",
				count, ret, sizeof(buf));
			return -1;
		}

		count++;
		printf("%c", buf);
	}

	printf("\n Good Read.\n");
	return 0;
}