1 /* $OpenBSD: progressmeter.c,v 1.40 2013/09/19 00:24:52 djm 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 <sys/types.h> 27 #include <sys/ioctl.h> 28 #include <sys/uio.h> 29 30 #include <errno.h> 31 #include <signal.h> 32 #include <stdio.h> 33 #include <string.h> 34 #include <time.h> 35 #include <unistd.h> 36 37 #include "progressmeter.h" 38 #include "atomicio.h" 39 #include "misc.h" 40 41 #define DEFAULT_WINSIZE 80 42 #define MAX_WINSIZE 512 43 #define PADDING 1 /* padding between the progress indicators */ 44 #define UPDATE_INTERVAL 1 /* update the progress meter every second */ 45 #define STALL_TIME 5 /* we're stalled after this many seconds */ 46 47 /* determines whether we can output to the terminal */ 48 static int can_output(void); 49 50 /* formats and inserts the specified size into the given buffer */ 51 static void format_size(char *, int, off_t); 52 static void format_rate(char *, int, off_t); 53 54 /* window resizing */ 55 static void sig_winch(int); 56 static void setscreensize(void); 57 58 /* updates the progressmeter to reflect the current state of the transfer */ 59 void refresh_progress_meter(void); 60 61 /* signal handler for updating the progress meter */ 62 static void update_progress_meter(int); 63 64 static time_t start; /* start progress */ 65 static time_t last_update; /* last progress update */ 66 static char *file; /* name of the file being transferred */ 67 static off_t start_pos; /* initial position of transfer */ 68 static off_t end_pos; /* ending position of transfer */ 69 static off_t cur_pos; /* transfer position as of last refresh */ 70 static volatile off_t *counter; /* progress counter */ 71 static long stalled; /* how long we have been stalled */ 72 static int bytes_per_second; /* current speed in bytes per second */ 73 static int win_size; /* terminal window size */ 74 static volatile sig_atomic_t win_resized; /* for window resizing */ 75 76 /* units for format_size */ 77 static const char unit[] = " KMGT"; 78 79 static int 80 can_output(void) 81 { 82 return (getpgrp() == tcgetpgrp(STDOUT_FILENO)); 83 } 84 85 static void 86 format_rate(char *buf, int size, off_t bytes) 87 { 88 int i; 89 90 bytes *= 100; 91 for (i = 0; bytes >= 100*1000 && unit[i] != 'T'; i++) 92 bytes = (bytes + 512) / 1024; 93 if (i == 0) { 94 i++; 95 bytes = (bytes + 512) / 1024; 96 } 97 snprintf(buf, size, "%3lld.%1lld%c%s", 98 (long long) (bytes + 5) / 100, 99 (long long) (bytes + 5) / 10 % 10, 100 unit[i], 101 i ? "B" : " "); 102 } 103 104 static void 105 format_size(char *buf, int size, off_t bytes) 106 { 107 int i; 108 109 for (i = 0; bytes >= 10000 && unit[i] != 'T'; i++) 110 bytes = (bytes + 512) / 1024; 111 snprintf(buf, size, "%4lld%c%s", 112 (long long) bytes, 113 unit[i], 114 i ? "B" : " "); 115 } 116 117 void 118 refresh_progress_meter(void) 119 { 120 char buf[MAX_WINSIZE + 1]; 121 time_t now; 122 off_t transferred; 123 double elapsed; 124 int percent; 125 off_t bytes_left; 126 int cur_speed; 127 int hours, minutes, seconds; 128 int i, len; 129 int file_len; 130 131 transferred = *counter - (cur_pos ? cur_pos : start_pos); 132 cur_pos = *counter; 133 now = monotime(); 134 bytes_left = end_pos - cur_pos; 135 136 if (bytes_left > 0) 137 elapsed = now - last_update; 138 else { 139 elapsed = now - start; 140 /* Calculate true total speed when done */ 141 transferred = end_pos - start_pos; 142 bytes_per_second = 0; 143 } 144 145 /* calculate speed */ 146 if (elapsed != 0) 147 cur_speed = (transferred / elapsed); 148 else 149 cur_speed = transferred; 150 151 #define AGE_FACTOR 0.9 152 if (bytes_per_second != 0) { 153 bytes_per_second = (bytes_per_second * AGE_FACTOR) + 154 (cur_speed * (1.0 - AGE_FACTOR)); 155 } else 156 bytes_per_second = cur_speed; 157 158 /* filename */ 159 buf[0] = '\0'; 160 file_len = win_size - 35; 161 if (file_len > 0) { 162 len = snprintf(buf, file_len + 1, "\r%s", file); 163 if (len < 0) 164 len = 0; 165 if (len >= file_len + 1) 166 len = file_len; 167 for (i = len; i < file_len; i++) 168 buf[i] = ' '; 169 buf[file_len] = '\0'; 170 } 171 172 /* percent of transfer done */ 173 if (end_pos != 0) 174 percent = ((float)cur_pos / end_pos) * 100; 175 else 176 percent = 100; 177 snprintf(buf + strlen(buf), win_size - strlen(buf), 178 " %3d%% ", percent); 179 180 /* amount transferred */ 181 format_size(buf + strlen(buf), win_size - strlen(buf), 182 cur_pos); 183 strlcat(buf, " ", win_size); 184 185 /* bandwidth usage */ 186 format_rate(buf + strlen(buf), win_size - strlen(buf), 187 (off_t)bytes_per_second); 188 strlcat(buf, "/s ", win_size); 189 190 /* ETA */ 191 if (!transferred) 192 stalled += elapsed; 193 else 194 stalled = 0; 195 196 if (stalled >= STALL_TIME) 197 strlcat(buf, "- stalled -", win_size); 198 else if (bytes_per_second == 0 && bytes_left) 199 strlcat(buf, " --:-- ETA", win_size); 200 else { 201 if (bytes_left > 0) 202 seconds = bytes_left / bytes_per_second; 203 else 204 seconds = elapsed; 205 206 hours = seconds / 3600; 207 seconds -= hours * 3600; 208 minutes = seconds / 60; 209 seconds -= minutes * 60; 210 211 if (hours != 0) 212 snprintf(buf + strlen(buf), win_size - strlen(buf), 213 "%d:%02d:%02d", hours, minutes, seconds); 214 else 215 snprintf(buf + strlen(buf), win_size - strlen(buf), 216 " %02d:%02d", minutes, seconds); 217 218 if (bytes_left > 0) 219 strlcat(buf, " ETA", win_size); 220 else 221 strlcat(buf, " ", win_size); 222 } 223 224 atomicio(vwrite, STDOUT_FILENO, buf, win_size - 1); 225 last_update = now; 226 } 227 228 /*ARGSUSED*/ 229 static void 230 update_progress_meter(int ignore) 231 { 232 int save_errno; 233 234 save_errno = errno; 235 236 if (win_resized) { 237 setscreensize(); 238 win_resized = 0; 239 } 240 if (can_output()) 241 refresh_progress_meter(); 242 243 signal(SIGALRM, update_progress_meter); 244 alarm(UPDATE_INTERVAL); 245 errno = save_errno; 246 } 247 248 void 249 start_progress_meter(char *f, off_t filesize, off_t *ctr) 250 { 251 start = last_update = monotime(); 252 file = f; 253 start_pos = *ctr; 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 } 306