wget: factor out progress bar code

Signed-off-by: Magnus Damm <magnus.damm@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

libbb/progress.c

@@ -0,0 +1,152 @@
+/* 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 "libbb.h"
+#include "unicode.h"
+
+enum {
+	/* Seconds when xfer considered "stalled" */
+	STALLTIME = 5
+};
+
+static unsigned int get_tty2_width(void)
+{
+	unsigned width;
+	get_terminal_width_height(2, &width, NULL);
+	return width;
+}
+
+void FAST_FUNC bb_progress_init(bb_progress_t *p)
+{
+	p->start_sec = monotonic_sec();
+	p->lastupdate_sec = p->start_sec;
+	p->lastsize = 0;
+}
+
+void FAST_FUNC bb_progress_update(bb_progress_t *p,
+		const char *curfile,
+		off_t beg_range,
+		off_t transferred,
+		off_t totalsize)
+{
+	off_t abbrevsize;
+	unsigned since_last_update, elapsed;
+	unsigned ratio;
+	int barlength, i;
+
+	ratio = 100;
+	if (totalsize) {
+		/* long long helps to have it working even if !LFS */
+		ratio = (unsigned) (100ULL * (transferred+beg_range) / totalsize);
+		if (ratio > 100) ratio = 100;
+	}
+
+#if ENABLE_FEATURE_ASSUME_UNICODE
+	check_unicode_in_env();
+	/* libbb candidate? */
+	{
+		wchar_t wbuf21[21];
+		char *buf = xstrdup(curfile);
+		unsigned len;
+
+		/* trim to 20 wide chars max (sets wbuf21[20] to 0)
+		 * also, in case mbstowcs fails, we at least
+		 * dont get garbage */
+		memset(wbuf21, 0, sizeof(wbuf21));
+		/* convert to wide chars, no more than 20 */
+		len = mbstowcs(wbuf21, curfile, 20); /* NB: may return -1 */
+		/* back to multibyte; cant overflow */
+		wcstombs(buf, wbuf21, INT_MAX);
+		len = (len > 20) ? 0 : 20 - len;
+		fprintf(stderr, "\r%s%*s%4d%% ", buf, len, "", ratio);
+		free(buf);
+	}
+#else
+	fprintf(stderr, "\r%-20.20s%4d%% ", curfile, ratio);
+#endif
+
+	barlength = get_tty2_width() - 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]);
+
+	elapsed = monotonic_sec();
+	since_last_update = elapsed - p->lastupdate_sec;
+	if (transferred > p->lastsize) {
+		p->lastupdate_sec = elapsed;
+		p->lastsize = transferred;
+		if (since_last_update >= STALLTIME) {
+			/* We "cut off" 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 {
+		off_t to_download = totalsize - beg_range;
+		if (!totalsize || transferred <= 0 || (int)elapsed <= 0 || transferred > to_download) {
+			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);
+		}
+	}
+}