progress bar to share problems.

[James Simmons]

In busybox 1.61. I moved the progress status bar out of wget into libbb. 
Then I had dd use the progress bar as well as wget. I attempted to port 
that change to 1.10 but now there is a struct global now so I don't know 
how to expose values in the progress bar to both wget and dd. Here is what 
I have so far. Basically all the global options for wget needs to be 
shared with dd but dd has its own global options. Any clean ideas to how 
to approach this.

/* vi: set sw=4 ts=4: */
/*
 * progress meter - a generic progress meter
 *
 * Stolen from BusyBox wget.c, originally by
 * Chip Rosenthal Covad Communications <chip at laserlink.net>
 */
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/types.h>
#include <string.h>
#include <signal.h>
#include "libbb.h"

/* Stuff below is from BSD rcp util.c, as added to openshh. 
 * Original copyright notice is retained at the end of this file.
 */ 

static void bb_progressmeter(int flag)
{
	/* We can be called from signal handler */
	int save_errno = errno;
	off_t abbrevsize;
	unsigned since_last_update, elapsed;
	unsigned ratio;
	int barlength, i;

	if (flag == -1) { /* first call to bb_progressmeter */
		start_sec = monotonic_sec();
		lastupdate_sec = start_sec;
		lastsize = 0;
		totalsize = content_len + beg_range; /* as content_len changes.. */
	}

	ratio = 100;
	if (totalsize != 0 && !chunked) {
		/* long long helps to have it working even if !LFS */
		ratio = (unsigned) (100ULL * (transferred+beg_range) / totalsize);
		if (ratio > 100) ratio = 100;
	}

	fprintf(stderr, "\r%-20.20s%4d%% ", curfile, ratio);

	get_terminal_width_height(0, &barlength, NULL);
	barlength -= 49;
	if (barlength > 0) {
		/* god bless gcc for variable arrays :) */
		i = barlength * ratio / 100;
		{
			char buf[i+1];
			memset(buf, '*', i);
			buf[i] = '\0';
			fprintf(stderr, "|%s%*s|", buf, barlength - i, "");
		}									
	}
	i = 0;
	abbrevsize = transferred + beg_range;
	while (abbrevsize >= 100000) {
		i++;
		abbrevsize >>= 10;
	}
	/* see http://en.wikipedia.org/wiki/Tera */
	fprintf(stderr, "%6d%c ", (int)abbrevsize, " kMGTPEZY"[i]);

// Nuts! Ain't it easier to update progress meter ONLY when we transferred++?

	elapsed = monotonic_sec();
	since_last_update = elapsed - lastupdate_sec;
	if (transferred > lastsize) {
		lastupdate_sec = elapsed;
		lastsize = transferred;
		if (since_last_update >= stalltime) {
			/* We "cut off" these seconds from elapsed time
			 * by adjusting start time */
			start_sec += since_last_update;
		}
		since_last_update = 0; /* we are un-stalled now */
	}
	elapsed -= start_sec; /* now it's "elapsed since start" */

	if (since_last_update >= stalltime) {
		fprintf(stderr, " - stalled -");
	} else {
		off_t to_download = totalsize - beg_range;
		if (transferred <= 0 || (int)elapsed <= 0 || transferred > to_download || chunked) {
			fprintf(stderr, "--:--:-- ETA");
		} else {
			/* to_download / (transferred/elapsed) - elapsed: */
			int eta = (int) ((unsigned long long)to_download*elapsed/transferred - elapsed);
			/* (long long helps to have working ETA even if !LFS) */
			i = eta % 3600;
			fprintf(stderr, "%02d:%02d:%02d ETA", eta / 3600, i / 60, i % 60);
		}
	}

	if (flag == 0) {
		/* last call to bb_progressmeter */
		alarm(0);
		transferred = 0;
		fputc('\n', stderr);
	} else {
		if (flag == -1) { /* first call to bb_progressmeter */
			signal_SA_RESTART_empty_mask(SIGALRM, bb_progressmeter);
		}
		alarm(1);
	}

	errno = save_errno;
}

/* Original copyright notice which applies to the CONFIG_FEATURE_PROGRESSMETER
 * stuff, much of which was blatently stolen from openssh.  */
 
/*-
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change 
 *		ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change> 
 *
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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