/* File crlf.c
 * February 10, 1998
 * By Doug Mink, Harvard-Smithsonian Center for Astrophysics
 * Send bug reports to dmink@cfa.harvard.edu
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>

static int verbose = 0;         /* verbose/debugging flag */
static void usage();
static void CRFix();

main (ac, av)
int ac;
char **av;
{
    char *fn;
    char *str;

    /* crack arguments */
    for (av++; --ac > 0 && *(str = *av) == '-'; av++) {
        char c;
        while (c = *++str)
        switch (c) {

        case 'v':       /* more verbosity */
            verbose++;
            break;

        default:
            usage();
            break;
        }
    }

    /* There are ac remaining file names starting at av[0] */
    if (ac == 0)
        usage ();

    while (ac-- > 0) {
	fn = *av++;
	if (verbose)
    	    printf ("%s:\n", fn);
	CRFix (fn);
	if (verbose)
	    printf ("\n");
	}

    return (0);
}

static void
usage ()
{
    fprintf (stderr,"CRLF: Change carriage returns to linefeeds in a file\n");
    fprintf(stderr,"Usage:  crlf [-v] file1 file2 ... filen\n");
    fprintf(stderr,"  -v: verbose\n");
    exit (1);
}

static void
CRFix (name)

char *name;

{
    char buffer[1000];
    int fd;
    int nbr, i;

    fd = open (name, O_RDONLY);
    nbr = 1000;
    while (nbr > 0) {
	nbr = read (fd, buffer, 1000);
	if (nbr > 0) {
	    for (i = 0; i < nbr; i++) {
		if (buffer[i] == (char) 13)
		    buffer[i] = (char) 10;
		}
	    write (1, buffer, nbr);
	    }
	}
   return;
}