no13.c File Reference

#include <fcntl.h>
#include <stdio.h>

Include dependency graph for no13.c:

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Functions
	main (int argc, char **argv)

Function Documentation

main	(	int	argc,
		char **	argv
	)

Definition at line 25 of file no13.c.

{
    int fd, loop;
    char ch;
    char breakcnt = 0;

    if (argc != 2) {
        fprintf(stderr, "This program writes to stdout, so to be useful,\n\tit should be redirected (e.g no13 bla > bla.dat)\nusage: %s <filename>\n", argv[0]);
        exit(1);
    }
    fd = open(argv[1], O_RDONLY, S_IREAD|S_IWRITE|S_IRGRP|S_IROTH);
    while (read(fd, &ch, 1) == 1) {
        if (ch == 0x0d) {   // CR
            breakcnt++;
            continue;
        }
        if (ch == 0x1a) // Ctrl-Z
            continue;

        if (ch != 0x0a) {   // LF
            if (breakcnt > 1) {
                for (loop = breakcnt; loop > 0; loop--)
                    putchar(0x0d);
                putchar(0x0a);
            }
            breakcnt=0;
        }
        putchar(ch);
    }
    close(fd);
}