release/src/router/busybox/debianutils/pipe_progress.c

   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  */
  20 int pipe_progress_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  21 int 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 }