progress.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Progress bar code.
   4  */
   5 /* Original copyright notice which applies to the CONFIG_FEATURE_WGET_STATUSBAR stuff,
   6  * much of which was blatantly stolen from openssh.
   7  */
   8 /*-
   9  * Copyright (c) 1992, 1993
  10  * The Regents of the University of California.  All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  *
  21  * 3. BSD Advertising Clause omitted per the July 22, 1999 licensing change
  22  *    ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
  23  *
  24  * 4. Neither the name of the University nor the names of its contributors
  25  *    may be used to endorse or promote products derived from this software
  26  *    without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  */
  40 #include <sys/types.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <limits.h>
  44 #include <string.h>
  45 #include <libubox/utils.h>
  46 #include "progress.h"
  47
  48 enum {
  49         /* Seconds when xfer considered "stalled" */
  50         STALLTIME = 5
  51 };
  52
  53 static int
  54 wh_helper(int value, int def_val, const char *env_name)
  55 {
  56         if (value == 0) {
  57                 char *s = getenv(env_name);
  58                 if (s)
  59                         value = atoi(s);
  60         }
  61         if (value <= 1 || value >= 30000)
  62                 value = def_val;
  63         return value;
  64 }
  65
  66 static unsigned int
  67 get_tty2_width(void)
  68 {
  69 #ifndef TIOCGWINSZ
  70         return wh_helper(0, 80, "COLUMNS");
  71 #else
  72         struct winsize win = {0};
  73         ioctl(2, TIOCGWINSZ, &win);
  74         return wh_helper(win.ws_col, 80, "COLUMNS");
  75 #endif
  76 }
  77
  78 static unsigned int
  79 monotonic_sec(void)
  80 {
  81         struct timespec tv;
  82         clock_gettime(CLOCK_MONOTONIC, &tv);
  83         return tv.tv_sec;
  84 }
  85
  86 void
  87 progress_init(struct progress *p, const char *curfile)
  88 {
  89         p->curfile = strdup(curfile);
  90         p->start_sec = monotonic_sec();
  91         p->last_update_sec = p->start_sec;
  92         p->last_change_sec = p->start_sec;
  93         p->last_size = 0;
  94 }
  95
  96 /* File already had beg_size bytes.
  97  * Then we started downloading.
  98  * We downloaded "transferred" bytes so far.
  99  * Download is expected to stop when total size (beg_size + transferred)
 100  * will be "totalsize" bytes.
 101  * If totalsize == 0, then it is unknown.
 102  */
 103 void
 104 progress_update(struct progress *p, off_t beg_size,
 105                 off_t transferred, off_t totalsize)
 106 {
 107         off_t beg_and_transferred;
 108         unsigned since_last_update, elapsed;
 109         int barlength;
 110         int kiloscale;
 111
 112         //transferred = 1234; /* use for stall detection testing */
 113         //totalsize = 0; /* use for unknown size download testing */
 114
 115         elapsed = monotonic_sec();
 116         since_last_update = elapsed - p->last_update_sec;
 117         p->last_update_sec = elapsed;
 118
 119         if (totalsize != 0 && transferred >= totalsize - beg_size) {
 120                 /* Last call. Do not skip this update */
 121                 transferred = totalsize - beg_size; /* sanitize just in case */
 122         }
 123         else if (since_last_update == 0) {
 124                 /*
 125                  * Do not update on every call
 126                  * (we can be called on every network read!)
 127                  */
 128                 return;
 129         }
 130
 131         kiloscale = 0;
 132         /*
 133          * Scale sizes down if they are close to overflowing.
 134          * This allows calculations like (100 * transferred / totalsize)
 135          * without risking overflow: we guarantee 10 highest bits to be 0.
 136          * Introduced error is less than 1 / 2^12 ~= 0.025%
 137          */
 138         if (ULONG_MAX > 0xffffffff || sizeof(off_t) == 4 || sizeof(off_t) != 8) {
 139                 /*
 140                  * 64-bit CPU || small off_t: in either case,
 141                  * >> is cheap, single-word operation.
 142                  * ... || strange off_t: also use this code
 143                  * (it is safe, just suboptimal wrt code size),
 144                  * because 32/64 optimized one works only for 64-bit off_t.
 145                  */
 146                 if (totalsize >= (1 << 22)) {
 147                         totalsize >>= 10;
 148                         beg_size >>= 10;
 149                         transferred >>= 10;
 150                         kiloscale = 1;
 151                 }
 152         } else {
 153                 /* 32-bit CPU and 64-bit off_t.
 154                  * Use a 40-bit shift, it is easier to do on 32-bit CPU.
 155                  */
 156 /* ONE suppresses "warning: shift count >= width of type" */
 157 #define ONE (sizeof(off_t) > 4)
 158                 if (totalsize >= (off_t)(1ULL << 54*ONE)) {
 159                         totalsize = (uint32_t)(totalsize >> 32*ONE) >> 8;
 160                         beg_size = (uint32_t)(beg_size >> 32*ONE) >> 8;
 161                         transferred = (uint32_t)(transferred >> 32*ONE) >> 8;
 162                         kiloscale = 4;
 163                 }
 164         }
 165
 166         fprintf(stderr, "\r%-20.20s", p->curfile);
 167
 168         beg_and_transferred = beg_size + transferred;
 169
 170         if (totalsize != 0) {
 171                 unsigned ratio = 100 * beg_and_transferred / totalsize;
 172                 fprintf(stderr, "%4u%%", ratio);
 173
 174                 barlength = get_tty2_width() - 49;
 175                 if (barlength > 0) {
 176                         /* god bless gcc for variable arrays :) */
 177                         char buf[barlength + 1];
 178                         unsigned stars = (unsigned)barlength * beg_and_transferred / totalsize;
 179                         memset(buf, ' ', barlength);
 180                         buf[barlength] = '\0';
 181                         memset(buf, '*', stars);
 182                         fprintf(stderr, " |%s|", buf);
 183                 }
 184         }
 185
 186         while (beg_and_transferred >= 100000) {
 187                 beg_and_transferred >>= 10;
 188                 kiloscale++;
 189         }
 190         /* see http://en.wikipedia.org/wiki/Tera */
 191         fprintf(stderr, "%6u%c", (unsigned)beg_and_transferred, " kMGTPEZY"[kiloscale]);
 192
 193         since_last_update = elapsed - p->last_change_sec;
 194         if ((unsigned)transferred != p->last_size) {
 195                 p->last_change_sec = elapsed;
 196                 p->last_size = (unsigned)transferred;
 197                 if (since_last_update >= STALLTIME) {
 198                         /* We "cut out" these seconds from elapsed time
 199                          * by adjusting start time */
 200                         p->start_sec += since_last_update;
 201                 }
 202                 since_last_update = 0; /* we are un-stalled now */
 203         }
 204
 205         elapsed -= p->start_sec; /* now it's "elapsed since start" */
 206
 207         if (since_last_update >= STALLTIME) {
 208                 fprintf(stderr, "  - stalled -");
 209         } else if (!totalsize || !transferred || (int)elapsed < 0) {
 210                 fprintf(stderr, " --:--:-- ETA");
 211         } else {
 212                 unsigned eta, secs, hours;
 213
 214                 totalsize -= beg_size; /* now it's "total to upload" */
 215
 216                 /* Estimated remaining time =
 217                  * estimated_sec_to_dl_totalsize_bytes - elapsed_sec =
 218                  * totalsize / average_bytes_sec_so_far - elapsed =
 219                  * totalsize / (transferred/elapsed) - elapsed =
 220                  * totalsize * elapsed / transferred - elapsed
 221                  */
 222                 eta = totalsize * elapsed / transferred - elapsed;
 223                 if (eta >= 1000*60*60)
 224                         eta = 1000*60*60 - 1;
 225                 secs = eta % 3600;
 226                 hours = eta / 3600;
 227                 fprintf(stderr, "%3u:%02u:%02u ETA", hours, secs / 60, secs % 60);
 228         }
 229 }