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/* vi: set sw=4 ts=4: */
/*
* Progress bar code.
*/
/* Original copyright notice which applies to the CONFIG_FEATURE_WGET_STATUSBAR stuff,
* much of which was blatantly 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
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <string.h>
#include <libubox/utils.h>
#include "progress.h"
enum {
/* Seconds when xfer considered "stalled" */
STALLTIME = 5
};
static int
wh_helper(int value, int def_val, const char *env_name)
{
if (value == 0) {
char *s = getenv(env_name);
if (s)
value = atoi(s);
}
if (value <= 1 || value >= 30000)
value = def_val;
return value;
}
static unsigned int
get_tty2_width(void)
{
#ifndef TIOCGWINSZ
return wh_helper(0, 80, "COLUMNS");
#else
struct winsize win = {0};
ioctl(2, TIOCGWINSZ, &win);
return wh_helper(win.ws_col, 80, "COLUMNS");
#endif
}
static unsigned int
monotonic_sec(void)
{
struct timespec tv;
clock_gettime(CLOCK_MONOTONIC, &tv);
return tv.tv_sec;
}
void
progress_init(struct progress *p, const char *curfile)
{
p->curfile = strdup(curfile);
p->start_sec = monotonic_sec();
p->last_update_sec = p->start_sec;
p->last_change_sec = p->start_sec;
p->last_size = 0;
}
/* File already had beg_size bytes.
* Then we started downloading.
* We downloaded "transferred" bytes so far.
* Download is expected to stop when total size (beg_size + transferred)
* will be "totalsize" bytes.
* If totalsize == 0, then it is unknown.
*/
void
progress_update(struct progress *p, off_t beg_size,
off_t transferred, off_t totalsize)
{
off_t beg_and_transferred;
unsigned since_last_update, elapsed;
int barlength;
int kiloscale;
//transferred = 1234; /* use for stall detection testing */
//totalsize = 0; /* use for unknown size download testing */
elapsed = monotonic_sec();
since_last_update = elapsed - p->last_update_sec;
p->last_update_sec = elapsed;
if (totalsize != 0 && transferred >= totalsize - beg_size) {
/* Last call. Do not skip this update */
transferred = totalsize - beg_size; /* sanitize just in case */
}
else if (since_last_update == 0) {
/*
* Do not update on every call
* (we can be called on every network read!)
*/
return;
}
kiloscale = 0;
/*
* Scale sizes down if they are close to overflowing.
* This allows calculations like (100 * transferred / totalsize)
* without risking overflow: we guarantee 10 highest bits to be 0.
* Introduced error is less than 1 / 2^12 ~= 0.025%
*/
if (ULONG_MAX > 0xffffffff || sizeof(off_t) == 4 || sizeof(off_t) != 8) {
/*
* 64-bit CPU || small off_t: in either case,
* >> is cheap, single-word operation.
* ... || strange off_t: also use this code
* (it is safe, just suboptimal wrt code size),
* because 32/64 optimized one works only for 64-bit off_t.
*/
if (totalsize >= (1 << 22)) {
totalsize >>= 10;
beg_size >>= 10;
transferred >>= 10;
kiloscale = 1;
}
} else {
/* 32-bit CPU and 64-bit off_t.
* Use a 40-bit shift, it is easier to do on 32-bit CPU.
*/
/* ONE suppresses "warning: shift count >= width of type" */
#define ONE (sizeof(off_t) > 4)
if (totalsize >= (off_t)(1ULL << 54*ONE)) {
totalsize = (uint32_t)(totalsize >> 32*ONE) >> 8;
beg_size = (uint32_t)(beg_size >> 32*ONE) >> 8;
transferred = (uint32_t)(transferred >> 32*ONE) >> 8;
kiloscale = 4;
}
}
fprintf(stderr, "\r%-20.20s", p->curfile);
beg_and_transferred = beg_size + transferred;
if (totalsize != 0) {
unsigned ratio = 100 * beg_and_transferred / totalsize;
fprintf(stderr, "%4u%%", ratio);
barlength = get_tty2_width() - 49;
if (barlength > 0) {
/* god bless gcc for variable arrays :) */
char buf[barlength + 1];
unsigned stars = (unsigned)barlength * beg_and_transferred / totalsize;
memset(buf, ' ', barlength);
buf[barlength] = '\0';
memset(buf, '*', stars);
fprintf(stderr, " |%s|", buf);
}
}
while (beg_and_transferred >= 100000) {
beg_and_transferred >>= 10;
kiloscale++;
}
/* see http://en.wikipedia.org/wiki/Tera */
fprintf(stderr, "%6u%c", (unsigned)beg_and_transferred, " kMGTPEZY"[kiloscale]);
since_last_update = elapsed - p->last_change_sec;
if ((unsigned)transferred != p->last_size) {
p->last_change_sec = elapsed;
p->last_size = (unsigned)transferred;
if (since_last_update >= STALLTIME) {
/* We "cut out" these seconds from elapsed time
* by adjusting start time */
p->start_sec += since_last_update;
}
since_last_update = 0; /* we are un-stalled now */
}
elapsed -= p->start_sec; /* now it's "elapsed since start" */
if (since_last_update >= STALLTIME) {
fprintf(stderr, " - stalled -");
} else if (!totalsize || !transferred || (int)elapsed < 0) {
fprintf(stderr, " --:--:-- ETA");
} else {
unsigned eta, secs, hours;
totalsize -= beg_size; /* now it's "total to upload" */
/* Estimated remaining time =
* estimated_sec_to_dl_totalsize_bytes - elapsed_sec =
* totalsize / average_bytes_sec_so_far - elapsed =
* totalsize / (transferred/elapsed) - elapsed =
* totalsize * elapsed / transferred - elapsed
*/
eta = totalsize * elapsed / transferred - elapsed;
if (eta >= 1000*60*60)
eta = 1000*60*60 - 1;
secs = eta % 3600;
hours = eta / 3600;
fprintf(stderr, "%3u:%02u:%02u ETA", hours, secs / 60, secs % 60);
}
}
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