// Simple implementation of reading files
// passed as command line arguments
// using fgetc - in other words cat
// Andrew Taylor - andrewt@unsw.edu.au
// 08/3/19

#include <stdio.h>

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

    // go through a list of files specified on the command line
    // printing their contents in turn to standard output

    int argument = 1;
    while (argument < argc) {

        // FILE is an opaque (hidden type) defined in stdio.h
        // "r" indicate we are opening file to read contents

        FILE *stream = fopen(argv[argument], "r");
        if (stream == NULL) {
            perror(argv[argument]);  // prints why the open failed
            return 1;
        }

        // fgetc returns next the next byte (ascii code if its a text file)
        // from a stream
        // it returns the special value EOF if not more bytes can be read from the stream

        int c = fgetc(stream);

        // return  bytes from the stream (file) one at a time

        while (c != EOF) {
            fputc(c, stdout); // write the byte to standard output
            c = fgetc(stream);
        }
        
        fclose(stream);
        argument = argument + 1;
    }
    return 0;
}