LXR busybox/debianutils/pipe

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * Monitor a pipe with a simple progress display.
   4 *
   5 * Copyright (C) 2003 by Rob Landley <rob@landley.net>, Joey Hess
   6 *
   7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   8 */
   9
  10//usage:#define pipe_progress_trivial_usage NOUSAGE_STR
  11//usage:#define pipe_progress_full_usage ""
  12
  13#include "libbb.h"
  14
  15#define PIPE_PROGRESS_SIZE 4096
  16
  17/* Read a block of data from stdin, write it to stdout.
  18 * Activity is indicated by a '.' to stderr
  19 */
  20int pipe_progress_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  21int pipe_progress_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
  22{
  23        char buf[PIPE_PROGRESS_SIZE];
  24        time_t t = time(NULL);
  25        int len;
  26
  27        while ((len = safe_read(STDIN_FILENO, buf, PIPE_PROGRESS_SIZE)) > 0) {
  28                time_t new_time = time(NULL);
  29                if (new_time != t) {
  30                        t = new_time;
  31                        bb_putchar_stderr('.');
  32                }
  33                full_write(STDOUT_FILENO, buf, len);
  34        }
  35
  36        bb_putchar_stderr('\n');
  37
  38        return 0;
  39}
  40