release/src/router/busybox/libbb/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 "libbb.h"
  41 #include "unicode.h"
  42
  43 enum {
  44         /* Seconds when xfer considered "stalled" */
  45         STALLTIME = 5
  46 };
  47
  48 static unsigned int get_tty2_width(void)
  49 {
  50         unsigned width;
  51         get_terminal_width_height(2, &width, NULL);
  52         return width;
  53 }
  54
  55 void FAST_FUNC bb_progress_init(bb_progress_t *p, const char *curfile)
  56 {
  57 #if ENABLE_UNICODE_SUPPORT
  58         init_unicode();
  59         p->curfile = unicode_conv_to_printable_fixedwidth(/*NULL,*/ curfile, 20);
  60 #else
  61         p->curfile = curfile;
  62 #endif
  63         p->start_sec = monotonic_sec();
  64         p->last_update_sec = p->start_sec;
  65         p->last_change_sec = p->start_sec;
  66         p->last_size = 0;
  67 }
  68
  69 void FAST_FUNC bb_progress_update(bb_progress_t *p,
  70                 uoff_t beg_size,
  71                 uoff_t transferred,
  72                 uoff_t totalsize)
  73 {
  74         uoff_t beg_and_transferred;
  75         unsigned since_last_update, elapsed;
  76         int barlength;
  77         int kiloscale;
  78
  79         //transferred = 1234; /* use for stall detection testing */
  80         //totalsize = 0; /* use for unknown size download testing */
  81
  82         elapsed = monotonic_sec();
  83         since_last_update = elapsed - p->last_update_sec;
  84         p->last_update_sec = elapsed;
  85
  86         if (totalsize != 0 && transferred >= totalsize - beg_size) {
  87                 /* Last call. Do not skip this update */
  88                 transferred = totalsize - beg_size; /* sanitize just in case */
  89         }
  90         else if (since_last_update == 0) {
  91                 /*
  92                  * Do not update on every call
  93                  * (we can be called on every network read!)
  94                  */
  95                 return;
  96         }
  97
  98         kiloscale = 0;
  99         /*
 100          * Scale sizes down if they are close to overflowing.
 101          * This allows calculations like (100 * transferred / totalsize)
 102          * without risking overflow: we guarantee 10 highest bits to be 0.
 103          * Introduced error is less than 1 / 2^12 ~= 0.025%
 104          */
 105         if (ULONG_MAX > 0xffffffff || sizeof(off_t) == 4 || sizeof(off_t) != 8) {
 106                 /*
 107                  * 64-bit CPU || small off_t: in either case,
 108                  * >> is cheap, single-word operation.
 109                  * ... || strange off_t: also use this code
 110                  * (it is safe, just suboptimal wrt code size),
 111                  * because 32/64 optimized one works only for 64-bit off_t.
 112                  */
 113                 if (totalsize >= (1 << 22)) {
 114                         totalsize >>= 10;
 115                         beg_size >>= 10;
 116                         transferred >>= 10;
 117                         kiloscale = 1;
 118                 }
 119         } else {
 120                 /* 32-bit CPU and 64-bit off_t.
 121                  * Use a 40-bit shift, it is easier to do on 32-bit CPU.
 122                  */
 123 /* ONE suppresses "warning: shift count >= width of type" */
 124 #define ONE (sizeof(off_t) > 4)
 125                 if (totalsize >= (uoff_t)(1ULL << 54*ONE)) {
 126                         totalsize = (uint32_t)(totalsize >> 32*ONE) >> 8;
 127                         beg_size = (uint32_t)(beg_size >> 32*ONE) >> 8;
 128                         transferred = (uint32_t)(transferred >> 32*ONE) >> 8;
 129                         kiloscale = 4;
 130                 }
 131         }
 132
 133         if (ENABLE_UNICODE_SUPPORT)
 134                 fprintf(stderr, "\r%s", p->curfile);
 135         else
 136                 fprintf(stderr, "\r%-20.20s", p->curfile);
 137
 138         beg_and_transferred = beg_size + transferred;
 139
 140         if (totalsize != 0) {
 141                 unsigned ratio = 100 * beg_and_transferred / totalsize;
 142                 fprintf(stderr, "%4u%%", ratio);
 143
 144                 barlength = get_tty2_width() - 49;
 145                 if (barlength > 0) {
 146                         /* god bless gcc for variable arrays :) */
 147                         char buf[barlength + 1];
 148                         unsigned stars = (unsigned)barlength * beg_and_transferred / totalsize;
 149                         memset(buf, ' ', barlength);
 150                         buf[barlength] = '\0';
 151                         memset(buf, '*', stars);
 152                         fprintf(stderr, " |%s|", buf);
 153                 }
 154         }
 155
 156         while (beg_and_transferred >= 100000) {
 157                 beg_and_transferred >>= 10;
 158                 kiloscale++;
 159         }
 160         /* see http://en.wikipedia.org/wiki/Tera */
 161         fprintf(stderr, "%6u%c", (unsigned)beg_and_transferred, " kMGTPEZY"[kiloscale]);
 162 #define beg_and_transferred dont_use_beg_and_transferred_below()
 163
 164         since_last_update = elapsed - p->last_change_sec;
 165         if ((unsigned)transferred != p->last_size) {
 166                 p->last_change_sec = elapsed;
 167                 p->last_size = (unsigned)transferred;
 168                 if (since_last_update >= STALLTIME) {
 169                         /* We "cut out" these seconds from elapsed time
 170                          * by adjusting start time */
 171                         p->start_sec += since_last_update;
 172                 }
 173                 since_last_update = 0; /* we are un-stalled now */
 174         }
 175         elapsed -= p->start_sec; /* now it's "elapsed since start" */
 176
 177         if (since_last_update >= STALLTIME) {
 178                 fprintf(stderr, "  - stalled -");
 179         } else if (!totalsize || !transferred || (int)elapsed < 0) {
 180                 fprintf(stderr, " --:--:-- ETA");
 181         } else {
 182                 unsigned eta, secs, hours;
 183
 184                 totalsize -= beg_size; /* now it's "total to upload" */
 185
 186                 /* Estimated remaining time =
 187                  * estimated_sec_to_dl_totalsize_bytes - elapsed_sec =
 188                  * totalsize / average_bytes_sec_so_far - elapsed =
 189                  * totalsize / (transferred/elapsed) - elapsed =
 190                  * totalsize * elapsed / transferred - elapsed
 191                  */
 192                 eta = totalsize * elapsed / transferred - elapsed;
 193                 if (eta >= 1000*60*60)
 194                         eta = 1000*60*60 - 1;
 195                 secs = eta % 3600;
 196                 hours = eta / 3600;
 197                 fprintf(stderr, "%3u:%02u:%02u ETA", hours, secs / 60, secs % 60);
 198         }
 199 }