source: liacs/da/opdr2b/read.cc@ 3

/* Author    : Rick van der Zwet
 * S-number  : 0433373
 * Version   : $Id: read.cc 390 2007-12-20 23:24:34Z rick $
 * Copyright : FreeBSD Licence
 */
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <sysexits.h>


//XXX: File are only checked at creation time, not during execution
int main (int argc, char ** argv)
{
    FILE * input;
    FILE * output;

    if (argc < 2)
    {
        fprintf(stderr, "Usage: %s <infile> [<outfile>]\n",argv[0]);
        return(EX_USAGE);
    }

    input = fopen(argv[1], "r");
    if (input == NULL)
    {
        fprintf(stderr,"Error: Unable to use `%s', errno: %i\n",
                argv[1], errno);
        return(EX_NOINPUT);
    }

    if (argc == 3)
    {
        output = fopen(argv[2], "w");
        if (output == NULL)
        {
            fprintf(stderr,"Error: Unable to use `%s', errno: %i\n",
                    argv[2], errno);
            return(EX_CANTCREAT);
        }
    }
    else
    {
        output = stdout;
    }


    int number = 0;
    int row = 0;
    while ((number = getc(input)) != EOF)
    {
        fprintf(output,"%03i ", number);
        row++;
        if ( row == 20 )
        {
            printf("\n");
            row = 0;
        }
    }

    fprintf(output,"\n");
    fclose(input);
    fclose(output);
    return(EX_OK);
}