source: MondoRescue/branches/3.2/mindi-busybox/debianutils/pipe_progress.c

/* vi: set sw=4 ts=4: */
/*
 * Monitor a pipe with a simple progress display.
 *
 * Copyright (C) 2003 by Rob Landley <rob@landley.net>, Joey Hess
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 */

//usage:#define pipe_progress_trivial_usage NOUSAGE_STR
//usage:#define pipe_progress_full_usage ""

#include "libbb.h"

#define PIPE_PROGRESS_SIZE 4096

/* Read a block of data from stdin, write it to stdout.
 * Activity is indicated by a '.' to stderr
 */
int pipe_progress_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int pipe_progress_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
    char buf[PIPE_PROGRESS_SIZE];
    time_t t = time(NULL);
    int len;

    while ((len = safe_read(STDIN_FILENO, buf, PIPE_PROGRESS_SIZE)) > 0) {
        time_t new_time = time(NULL);
        if (new_time != t) {
            t = new_time;
            bb_putchar_stderr('.');
        }
        full_write(STDOUT_FILENO, buf, len);
    }

    bb_putchar_stderr('\n');

    return 0;
}