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+/* vi: set sw=4 ts=4: */
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+/*
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+ * Progress bar code.
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+ */
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+/* Original copyright notice which applies to the CONFIG_FEATURE_WGET_STATUSBAR stuff,
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+ * much of which was blatantly stolen from openssh.
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+ */
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+/*-
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+ * Copyright (c) 1992, 1993
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+ * The Regents of the University of California. All rights reserved.
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions
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+ * are met:
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+ * 1. Redistributions of source code must retain the above copyright
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+ * notice, this list of conditions and the following disclaimer.
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+ * 2. Redistributions in binary form must reproduce the above copyright
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+ * notice, this list of conditions and the following disclaimer in the
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+ * documentation and/or other materials provided with the distribution.
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+ *
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+ * 3. BSD Advertising Clause omitted per the July 22, 1999 licensing change
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+ * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
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+ *
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+ * 4. Neither the name of the University nor the names of its contributors
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+ * may be used to endorse or promote products derived from this software
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+ * without specific prior written permission.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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+ * SUCH DAMAGE.
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+ */
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+#include <sys/types.h>
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+#include <stdio.h>
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+#include <stdlib.h>
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+#include <limits.h>
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+#include <string.h>
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+#include <libubox/utils.h>
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+#include "progress.h"
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+
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+enum {
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+ /* Seconds when xfer considered "stalled" */
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+ STALLTIME = 5
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+};
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+
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+static int
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+wh_helper(int value, int def_val, const char *env_name)
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+{
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+ if (value == 0) {
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+ char *s = getenv(env_name);
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+ if (s)
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+ value = atoi(s);
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+ }
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+ if (value <= 1 || value >= 30000)
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+ value = def_val;
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+ return value;
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+}
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+
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+static unsigned int
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+get_tty2_width(void)
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+{
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+#ifndef TIOCGWINSZ
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+ return wh_helper(0, 80, "COLUMNS");
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+#else
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+ struct winsize win = {0};
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+ ioctl(2, TIOCGWINSZ, &win);
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+ return wh_helper(win.ws_col, 80, "COLUMNS");
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+#endif
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+}
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+
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+static unsigned int
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+monotonic_sec(void)
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+{
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+ struct timespec tv;
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+ clock_gettime(CLOCK_MONOTONIC, &tv);
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+ return tv.tv_sec;
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+}
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+
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+void
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+progress_init(struct progress *p, const char *curfile)
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+{
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+ p->curfile = strdup(curfile);
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+ p->start_sec = monotonic_sec();
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+ p->last_update_sec = p->start_sec;
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+ p->last_change_sec = p->start_sec;
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+ p->last_size = 0;
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+}
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+
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+/* File already had beg_size bytes.
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+ * Then we started downloading.
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+ * We downloaded "transferred" bytes so far.
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+ * Download is expected to stop when total size (beg_size + transferred)
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+ * will be "totalsize" bytes.
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+ * If totalsize == 0, then it is unknown.
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+ */
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+void
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+progress_update(struct progress *p, off_t beg_size,
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+ off_t transferred, off_t totalsize)
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+{
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+ off_t beg_and_transferred;
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+ unsigned since_last_update, elapsed;
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+ int barlength;
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+ int kiloscale;
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+
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+ //transferred = 1234; /* use for stall detection testing */
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+ //totalsize = 0; /* use for unknown size download testing */
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+
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+ elapsed = monotonic_sec();
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+ since_last_update = elapsed - p->last_update_sec;
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+ p->last_update_sec = elapsed;
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+
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+ if (totalsize != 0 && transferred >= totalsize - beg_size) {
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+ /* Last call. Do not skip this update */
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+ transferred = totalsize - beg_size; /* sanitize just in case */
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+ }
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+ else if (since_last_update == 0) {
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+ /*
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+ * Do not update on every call
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+ * (we can be called on every network read!)
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+ */
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+ return;
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+ }
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+
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+ kiloscale = 0;
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+ /*
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+ * Scale sizes down if they are close to overflowing.
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+ * This allows calculations like (100 * transferred / totalsize)
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+ * without risking overflow: we guarantee 10 highest bits to be 0.
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+ * Introduced error is less than 1 / 2^12 ~= 0.025%
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+ */
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+ if (ULONG_MAX > 0xffffffff || sizeof(off_t) == 4 || sizeof(off_t) != 8) {
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+ /*
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+ * 64-bit CPU || small off_t: in either case,
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+ * >> is cheap, single-word operation.
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+ * ... || strange off_t: also use this code
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+ * (it is safe, just suboptimal wrt code size),
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+ * because 32/64 optimized one works only for 64-bit off_t.
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+ */
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+ if (totalsize >= (1 << 22)) {
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+ totalsize >>= 10;
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+ beg_size >>= 10;
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+ transferred >>= 10;
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+ kiloscale = 1;
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+ }
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+ } else {
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+ /* 32-bit CPU and 64-bit off_t.
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+ * Use a 40-bit shift, it is easier to do on 32-bit CPU.
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+ */
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+/* ONE suppresses "warning: shift count >= width of type" */
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+#define ONE (sizeof(off_t) > 4)
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+ if (totalsize >= (off_t)(1ULL << 54*ONE)) {
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+ totalsize = (uint32_t)(totalsize >> 32*ONE) >> 8;
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+ beg_size = (uint32_t)(beg_size >> 32*ONE) >> 8;
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+ transferred = (uint32_t)(transferred >> 32*ONE) >> 8;
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+ kiloscale = 4;
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+ }
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+ }
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+
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+ fprintf(stderr, "\r%-20.20s", p->curfile);
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+
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+ beg_and_transferred = beg_size + transferred;
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+
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+ if (totalsize != 0) {
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+ unsigned ratio = 100 * beg_and_transferred / totalsize;
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+ fprintf(stderr, "%4u%%", ratio);
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+
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+ barlength = get_tty2_width() - 49;
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+ if (barlength > 0) {
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+ /* god bless gcc for variable arrays :) */
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+ char buf[barlength + 1];
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+ unsigned stars = (unsigned)barlength * beg_and_transferred / totalsize;
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+ memset(buf, ' ', barlength);
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+ buf[barlength] = '\0';
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+ memset(buf, '*', stars);
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+ fprintf(stderr, " |%s|", buf);
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+ }
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+ }
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+
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+ while (beg_and_transferred >= 100000) {
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+ beg_and_transferred >>= 10;
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+ kiloscale++;
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+ }
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+ /* see http://en.wikipedia.org/wiki/Tera */
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+ fprintf(stderr, "%6u%c", (unsigned)beg_and_transferred, " kMGTPEZY"[kiloscale]);
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+
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+ since_last_update = elapsed - p->last_change_sec;
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+ if ((unsigned)transferred != p->last_size) {
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+ p->last_change_sec = elapsed;
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+ p->last_size = (unsigned)transferred;
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+ if (since_last_update >= STALLTIME) {
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+ /* We "cut out" these seconds from elapsed time
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+ * by adjusting start time */
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+ p->start_sec += since_last_update;
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+ }
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+ since_last_update = 0; /* we are un-stalled now */
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+ }
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+
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+ elapsed -= p->start_sec; /* now it's "elapsed since start" */
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+
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+ if (since_last_update >= STALLTIME) {
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+ fprintf(stderr, " - stalled -");
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+ } else if (!totalsize || !transferred || (int)elapsed < 0) {
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+ fprintf(stderr, " --:--:-- ETA");
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+ } else {
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+ unsigned eta, secs, hours;
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+
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+ totalsize -= beg_size; /* now it's "total to upload" */
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+
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+ /* Estimated remaining time =
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+ * estimated_sec_to_dl_totalsize_bytes - elapsed_sec =
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+ * totalsize / average_bytes_sec_so_far - elapsed =
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+ * totalsize / (transferred/elapsed) - elapsed =
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+ * totalsize * elapsed / transferred - elapsed
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+ */
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+ eta = totalsize * elapsed / transferred - elapsed;
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+ if (eta >= 1000*60*60)
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+ eta = 1000*60*60 - 1;
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+ secs = eta % 3600;
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+ hours = eta / 3600;
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+ fprintf(stderr, "%3u:%02u:%02u ETA", hours, secs / 60, secs % 60);
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+ }
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+}
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Felix Fietkau