progressmeter.c

   1 /* $OpenBSD: progressmeter.c,v 1.37 2006/08/03 03:34:42 deraadt Exp $ */
   2 /*
   3  * Copyright (c) 2003 Nils Nordman.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "includes.h"
  27
  28 #include <sys/types.h>
  29 #include <sys/ioctl.h>
  30 #include <sys/uio.h>
  31
  32 #include <errno.h>
  33 #include <signal.h>
  34 #include <stdio.h>
  35 #include <string.h>
  36 #include <time.h>
  37 #include <unistd.h>
  38
  39 #include "progressmeter.h"
  40 #include "atomicio.h"
  41 #include "misc.h"
  42
  43 #define DEFAULT_WINSIZE 80
  44 #define MAX_WINSIZE 512
  45 #define PADDING 1               /* padding between the progress indicators */
  46 #define UPDATE_INTERVAL 1       /* update the progress meter every second */
  47 #define STALL_TIME 5            /* we're stalled after this many seconds */
  48
  49 /* determines whether we can output to the terminal */
  50 static int can_output(void);
  51
  52 /* formats and inserts the specified size into the given buffer */
  53 static void format_size(char *, int, off_t);
  54 static void format_rate(char *, int, off_t);
  55
  56 /* window resizing */
  57 static void sig_winch(int);
  58 static void setscreensize(void);
  59
  60 /* updates the progressmeter to reflect the current state of the transfer */
  61 void refresh_progress_meter(void);
  62
  63 /* signal handler for updating the progress meter */
  64 static void update_progress_meter(int);
  65
  66 static time_t start;            /* start progress */
  67 static time_t last_update;      /* last progress update */
  68 static char *file;              /* name of the file being transferred */
  69 static off_t end_pos;           /* ending position of transfer */
  70 static off_t cur_pos;           /* transfer position as of last refresh */
  71 static volatile off_t *counter; /* progress counter */
  72 static long stalled;            /* how long we have been stalled */
  73 static int bytes_per_second;    /* current speed in bytes per second */
  74 static int win_size;            /* terminal window size */
  75 static volatile sig_atomic_t win_resized; /* for window resizing */
  76
  77 /* units for format_size */
  78 static const char unit[] = " KMGT";
  79
  80 static int
  81 can_output(void)
  82 {
  83         return (getpgrp() == tcgetpgrp(STDOUT_FILENO));
  84 }
  85
  86 static void
  87 format_rate(char *buf, int size, off_t bytes)
  88 {
  89         int i;
  90
  91         bytes *= 100;
  92         for (i = 0; bytes >= 100*1000 && unit[i] != 'T'; i++)
  93                 bytes = (bytes + 512) / 1024;
  94         if (i == 0) {
  95                 i++;
  96                 bytes = (bytes + 512) / 1024;
  97         }
  98         snprintf(buf, size, "%3lld.%1lld%c%s",
  99             (long long) (bytes + 5) / 100,
 100             (long long) (bytes + 5) / 10 % 10,
 101             unit[i],
 102             i ? "B" : " ");
 103 }
 104
 105 static void
 106 format_size(char *buf, int size, off_t bytes)
 107 {
 108         int i;
 109
 110         for (i = 0; bytes >= 10000 && unit[i] != 'T'; i++)
 111                 bytes = (bytes + 512) / 1024;
 112         snprintf(buf, size, "%4lld%c%s",
 113             (long long) bytes,
 114             unit[i],
 115             i ? "B" : " ");
 116 }
 117
 118 void
 119 refresh_progress_meter(void)
 120 {
 121         char buf[MAX_WINSIZE + 1];
 122         time_t now;
 123         off_t transferred;
 124         double elapsed;
 125         int percent;
 126         off_t bytes_left;
 127         int cur_speed;
 128         int hours, minutes, seconds;
 129         int i, len;
 130         int file_len;
 131
 132         transferred = *counter - cur_pos;
 133         cur_pos = *counter;
 134         now = time(NULL);
 135         bytes_left = end_pos - cur_pos;
 136
 137         if (bytes_left > 0)
 138                 elapsed = now - last_update;
 139         else {
 140                 elapsed = now - start;
 141                 /* Calculate true total speed when done */
 142                 transferred = end_pos;
 143                 bytes_per_second = 0;
 144         }
 145
 146         /* calculate speed */
 147         if (elapsed != 0)
 148                 cur_speed = (transferred / elapsed);
 149         else
 150                 cur_speed = transferred;
 151
 152 #define AGE_FACTOR 0.9
 153         if (bytes_per_second != 0) {
 154                 bytes_per_second = (bytes_per_second * AGE_FACTOR) +
 155                     (cur_speed * (1.0 - AGE_FACTOR));
 156         } else
 157                 bytes_per_second = cur_speed;
 158
 159         /* filename */
 160         buf[0] = '\0';
 161         file_len = win_size - 35;
 162         if (file_len > 0) {
 163                 len = snprintf(buf, file_len + 1, "\r%s", file);
 164                 if (len < 0)
 165                         len = 0;
 166                 if (len >= file_len + 1)
 167                         len = file_len;
 168                 for (i = len; i < file_len; i++)
 169                         buf[i] = ' ';
 170                 buf[file_len] = '\0';
 171         }
 172
 173         /* percent of transfer done */
 174         if (end_pos != 0)
 175                 percent = ((float)cur_pos / end_pos) * 100;
 176         else
 177                 percent = 100;
 178         snprintf(buf + strlen(buf), win_size - strlen(buf),
 179             " %3d%% ", percent);
 180
 181         /* amount transferred */
 182         format_size(buf + strlen(buf), win_size - strlen(buf),
 183             cur_pos);
 184         strlcat(buf, " ", win_size);
 185
 186         /* bandwidth usage */
 187         format_rate(buf + strlen(buf), win_size - strlen(buf),
 188             (off_t)bytes_per_second);
 189         strlcat(buf, "/s ", win_size);
 190
 191         /* ETA */
 192         if (!transferred)
 193                 stalled += elapsed;
 194         else
 195                 stalled = 0;
 196
 197         if (stalled >= STALL_TIME)
 198                 strlcat(buf, "- stalled -", win_size);
 199         else if (bytes_per_second == 0 && bytes_left)
 200                 strlcat(buf, "  --:-- ETA", win_size);
 201         else {
 202                 if (bytes_left > 0)
 203                         seconds = bytes_left / bytes_per_second;
 204                 else
 205                         seconds = elapsed;
 206
 207                 hours = seconds / 3600;
 208                 seconds -= hours * 3600;
 209                 minutes = seconds / 60;
 210                 seconds -= minutes * 60;
 211
 212                 if (hours != 0)
 213                         snprintf(buf + strlen(buf), win_size - strlen(buf),
 214                             "%d:%02d:%02d", hours, minutes, seconds);
 215                 else
 216                         snprintf(buf + strlen(buf), win_size - strlen(buf),
 217                             "  %02d:%02d", minutes, seconds);
 218
 219                 if (bytes_left > 0)
 220                         strlcat(buf, " ETA", win_size);
 221                 else
 222                         strlcat(buf, "    ", win_size);
 223         }
 224
 225         atomicio(vwrite, STDOUT_FILENO, buf, win_size - 1);
 226         last_update = now;
 227 }
 228
 229 /*ARGSUSED*/
 230 static void
 231 update_progress_meter(int ignore)
 232 {
 233         int save_errno;
 234
 235         save_errno = errno;
 236
 237         if (win_resized) {
 238                 setscreensize();
 239                 win_resized = 0;
 240         }
 241         if (can_output())
 242                 refresh_progress_meter();
 243
 244         signal(SIGALRM, update_progress_meter);
 245         alarm(UPDATE_INTERVAL);
 246         errno = save_errno;
 247 }
 248
 249 void
 250 start_progress_meter(char *f, off_t filesize, off_t *ctr)
 251 {
 252         start = last_update = time(NULL);
 253         file = f;
 254         end_pos = filesize;
 255         cur_pos = 0;
 256         counter = ctr;
 257         stalled = 0;
 258         bytes_per_second = 0;
 259
 260         setscreensize();
 261         if (can_output())
 262                 refresh_progress_meter();
 263
 264         signal(SIGALRM, update_progress_meter);
 265         signal(SIGWINCH, sig_winch);
 266         alarm(UPDATE_INTERVAL);
 267 }
 268
 269 void
 270 stop_progress_meter(void)
 271 {
 272         alarm(0);
 273
 274         if (!can_output())
 275                 return;
 276
 277         /* Ensure we complete the progress */
 278         if (cur_pos != end_pos)
 279                 refresh_progress_meter();
 280
 281         atomicio(vwrite, STDOUT_FILENO, "\n", 1);
 282 }
 283
 284 /*ARGSUSED*/
 285 static void
 286 sig_winch(int sig)
 287 {
 288         win_resized = 1;
 289 }
 290
 291 static void
 292 setscreensize(void)
 293 {
 294         struct winsize winsize;
 295
 296         if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &winsize) != -1 &&
 297             winsize.ws_col != 0) {
 298                 if (winsize.ws_col > MAX_WINSIZE)
 299                         win_size = MAX_WINSIZE;
 300                 else
 301                         win_size = winsize.ws_col;
 302         } else
 303                 win_size = DEFAULT_WINSIZE;
 304         win_size += 1;                                  /* trailing \0 */
 305 }