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 //config:config PIPE_PROGRESS
  10 //config:       bool "pipe_progress"
  11 //config:       default y
  12 //config:       help
  13 //config:         Display a dot to indicate pipe activity.
  14
  15 //applet:IF_PIPE_PROGRESS(APPLET(pipe_progress, BB_DIR_BIN, BB_SUID_DROP))
  16
  17 //kbuild:lib-$(CONFIG_PIPE_PROGRESS) += pipe_progress.o
  18
  19 //usage:#define pipe_progress_trivial_usage NOUSAGE_STR
  20 //usage:#define pipe_progress_full_usage ""
  21
  22 #include "libbb.h"
  23
  24 #define PIPE_PROGRESS_SIZE 4096
  25
  26 /* Read a block of data from stdin, write it to stdout.
  27  * Activity is indicated by a '.' to stderr
  28  */
  29 int pipe_progress_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  30 int pipe_progress_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
  31 {
  32         char buf[PIPE_PROGRESS_SIZE];
  33         time_t t = time(NULL);
  34         int len;
  35
  36         while ((len = safe_read(STDIN_FILENO, buf, PIPE_PROGRESS_SIZE)) > 0) {
  37                 time_t new_time = time(NULL);
  38                 if (new_time != t) {
  39                         t = new_time;
  40                         bb_putchar_stderr('.');
  41                 }
  42                 full_write(STDOUT_FILENO, buf, len);
  43         }
  44
  45         bb_putchar_stderr('\n');
  46
  47         return 0;
  48 }