dopmat / block1 / intro / myread

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

int main (int argc, char ** argv)
{
        int fd;
        ssize_t ret;
        char ch;
        if (argc < 2)
        {
                fprintf (stderr, "Too few arguments\n");
                exit (1);
        }

        fd = open (argv[1], O_RDONLY);
        if (fd < 0)
        {
                fprintf (stderr, "Cannot open file\n");
                exit (1);
        }       
        
        while ((ret = read (fd, &ch, 1)) > 0)
        {
                putchar (ch);
        }

        if (ret < 0)
        {
                fprintf (stderr, "myread: Cannot read file\n");
                exit (1);
        }
        close (fd);
        exit (0);
}