openssh-portable/progressmeter.c

308 lines
7.6 KiB
C

/* $OpenBSD: progressmeter.c,v 1.53 2023/04/12 14:22:04 jsg Exp $ */
/*
* Copyright (c) 2003 Nils Nordman. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 "includes.h"
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/uio.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "progressmeter.h"
#include "atomicio.h"
#include "misc.h"
#include "utf8.h"
#define DEFAULT_WINSIZE 80
#define MAX_WINSIZE 512
#define PADDING 1 /* padding between the progress indicators */
#define UPDATE_INTERVAL 1 /* update the progress meter every second */
#define STALL_TIME 5 /* we're stalled after this many seconds */
/* determines whether we can output to the terminal */
static int can_output(void);
/* window resizing */
static void sig_winch(int);
static void setscreensize(void);
/* signal handler for updating the progress meter */
static void sig_alarm(int);
static double start; /* start progress */
static double last_update; /* last progress update */
static const char *file; /* name of the file being transferred */
static off_t start_pos; /* initial position of transfer */
static off_t end_pos; /* ending position of transfer */
static off_t cur_pos; /* transfer position as of last refresh */
static volatile off_t *counter; /* progress counter */
static long stalled; /* how long we have been stalled */
static int bytes_per_second; /* current speed in bytes per second */
static int win_size; /* terminal window size */
static volatile sig_atomic_t win_resized; /* for window resizing */
static volatile sig_atomic_t alarm_fired;
/* units for format_size */
static const char unit[] = " KMGT";
static int
can_output(void)
{
#ifdef WINDOWS
/* On Windows, we can output if the stdout is a terminal*/
return isatty(STDOUT_FILENO);
#else
return (getpgrp() == tcgetpgrp(STDOUT_FILENO));
#endif
}
/* size needed to format integer type v, using (nbits(v) * log2(10) / 10) */
#define STRING_SIZE(v) (((sizeof(v) * 8 * 4) / 10) + 1)
static const char *
format_rate(off_t bytes)
{
int i;
static char buf[STRING_SIZE(bytes) * 2 + 16];
bytes *= 100;
for (i = 0; bytes >= 100*1000 && unit[i] != 'T'; i++)
bytes = (bytes + 512) / 1024;
if (i == 0) {
i++;
bytes = (bytes + 512) / 1024;
}
snprintf(buf, sizeof(buf), "%3lld.%1lld%c%s",
(long long) (bytes + 5) / 100,
(long long) (bytes + 5) / 10 % 10,
unit[i],
i ? "B" : " ");
return buf;
}
static const char *
format_size(off_t bytes)
{
int i;
static char buf[STRING_SIZE(bytes) + 16];
for (i = 0; bytes >= 10000 && unit[i] != 'T'; i++)
bytes = (bytes + 512) / 1024;
snprintf(buf, sizeof(buf), "%4lld%c%s",
(long long) bytes,
unit[i],
i ? "B" : " ");
return buf;
}
void
refresh_progress_meter(int force_update)
{
char *buf = NULL, *obuf = NULL;
off_t transferred;
double elapsed, now;
int percent;
off_t bytes_left;
int cur_speed;
int hours, minutes, seconds;
int file_len, cols;
if ((!force_update && !alarm_fired && !win_resized) || !can_output())
return;
alarm_fired = 0;
if (win_resized) {
setscreensize();
win_resized = 0;
}
transferred = *counter - (cur_pos ? cur_pos : start_pos);
cur_pos = *counter;
now = monotime_double();
bytes_left = end_pos - cur_pos;
if (bytes_left > 0)
elapsed = now - last_update;
else {
elapsed = now - start;
/* Calculate true total speed when done */
transferred = end_pos - start_pos;
bytes_per_second = 0;
}
/* calculate speed */
if (elapsed != 0)
cur_speed = (transferred / elapsed);
else
cur_speed = transferred;
#define AGE_FACTOR 0.9
if (bytes_per_second != 0) {
bytes_per_second = (bytes_per_second * AGE_FACTOR) +
(cur_speed * (1.0 - AGE_FACTOR));
} else
bytes_per_second = cur_speed;
last_update = now;
/* Don't bother if we can't even display the completion percentage */
if (win_size < 4)
return;
/* filename */
file_len = cols = win_size - 36;
if (file_len > 0) {
asmprintf(&buf, INT_MAX, &cols, "%-*s", file_len, file);
/* If we used fewer columns than expected then pad */
if (cols < file_len)
xextendf(&buf, NULL, "%*s", file_len - cols, "");
}
/* percent of transfer done */
if (end_pos == 0 || cur_pos == end_pos)
percent = 100;
else
percent = ((float)cur_pos / end_pos) * 100;
/* percent / amount transferred / bandwidth usage */
xextendf(&buf, NULL, " %3d%% %s %s/s ", percent, format_size(cur_pos),
format_rate((off_t)bytes_per_second));
/* ETA */
if (!transferred)
stalled += elapsed;
else
stalled = 0;
if (stalled >= STALL_TIME)
xextendf(&buf, NULL, "- stalled -");
else if (bytes_per_second == 0 && bytes_left)
xextendf(&buf, NULL, " --:-- ETA");
else {
if (bytes_left > 0)
seconds = bytes_left / bytes_per_second;
else
seconds = elapsed;
hours = seconds / 3600;
seconds -= hours * 3600;
minutes = seconds / 60;
seconds -= minutes * 60;
if (hours != 0) {
xextendf(&buf, NULL, "%d:%02d:%02d",
hours, minutes, seconds);
} else
xextendf(&buf, NULL, " %02d:%02d", minutes, seconds);
if (bytes_left > 0)
xextendf(&buf, NULL, " ETA");
else
xextendf(&buf, NULL, " ");
}
/* Finally, truncate string at window width */
cols = win_size - 1;
asmprintf(&obuf, INT_MAX, &cols, " %s", buf);
if (obuf != NULL) {
*obuf = '\r'; /* must insert as asmprintf() would escape it */
atomicio(vwrite, STDOUT_FILENO, obuf, strlen(obuf));
}
free(buf);
free(obuf);
}
static void
sig_alarm(int ignore)
{
alarm_fired = 1;
alarm(UPDATE_INTERVAL);
}
void
start_progress_meter(const char *f, off_t filesize, off_t *ctr)
{
start = last_update = monotime_double();
file = f;
start_pos = *ctr;
end_pos = filesize;
cur_pos = 0;
counter = ctr;
stalled = 0;
bytes_per_second = 0;
setscreensize();
refresh_progress_meter(1);
ssh_signal(SIGALRM, sig_alarm);
ssh_signal(SIGWINCH, sig_winch);
alarm(UPDATE_INTERVAL);
}
void
stop_progress_meter(void)
{
alarm(0);
if (!can_output())
return;
/* Ensure we complete the progress */
if (cur_pos != end_pos)
refresh_progress_meter(1);
atomicio(vwrite, STDOUT_FILENO, "\n", 1);
}
static void
sig_winch(int sig)
{
win_resized = 1;
}
static void
setscreensize(void)
{
struct winsize winsize;
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &winsize) != -1 &&
winsize.ws_col != 0) {
if (winsize.ws_col > MAX_WINSIZE)
win_size = MAX_WINSIZE;
else
win_size = winsize.ws_col;
} else
win_size = DEFAULT_WINSIZE;
win_size += 1; /* trailing \0 */
}