git.distorted.org.uk Git - u/mdw/catacomb/blob - cc-progress.c

   1 /* -*-c-*-
   2  *
   3  * Progress indicators for command-line tools
   4  *
   5  * (c) 2011 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of Catacomb.
  11  *
  12  * Catacomb is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU Library General Public License as
  14  * published by the Free Software Foundation; either version 2 of the
  15  * License, or (at your option) any later version.
  16  *
  17  * Catacomb is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU Library General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU Library General Public
  23  * License along with Catacomb; if not, write to the Free
  24  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  25  * MA 02111-1307, USA.
  26  */
  27
  28 /*----- Header files ------------------------------------------------------*/
  29
  30 #define _FILE_OFFSET_BITS 64
  31
  32 #include "config.h"
  33
  34 #include "cc.h"
  35
  36 #ifndef PATHSEP
  37 #  if defined(__riscos)
  38 #    define PATHSEP '.'
  39 #  elif defined(__unix) || defined(unix)
  40 #    define PATHSEP '/'
  41 #  else
  42 #    define PATHSEP '\\'
  43 #  endif
  44 #endif
  45
  46 /*----- Static data -------------------------------------------------------*/
  47
  48 static const char baton[] = "-\\|/";
  49
  50 /*----- Human-friendly unit printing --------------------------------------*/
  51
  52 struct unit {
  53   const char *name;
  54   int m;
  55 };
  56
  57 /* --- @prhuman_time@ --- *
  58  *
  59  * Arguments:   @FILE *fp@ = stream to print on
  60  *              @unsigned long n@ = time in seconds to print
  61  *
  62  * Returns:     ---
  63  *
  64  * Use:         Prints a time in some reasonable format.  The time takes up
  65  *              PRHUMAN_TIMEWD character spaces.
  66  */
  67
  68 #define PRHUMAN_TIMEWD 7
  69
  70 static void prhuman_time(FILE *fp, unsigned long n)
  71 {
  72   const static struct unit utime[] = {
  73     { "s",  60 }, { "m", 60 }, { "h", 24 }, { "d", 0 }
  74   };
  75
  76   unsigned long m = 0;
  77   const struct unit *u = utime;
  78
  79   while (u[1].m && n > u[0].m*u[1].m) { n /= u->m; u++; }
  80   m = n / u[1].m; n %= u[0].m;
  81   if (m) fprintf(fp, "%3lu%s%02lu%s", m, u[1].name, n, u[0].name);
  82   else fprintf(fp, "    %2lu%s", n, u[0].name);
  83 }
  84
  85 /* --- @prhuman_data@ --- *
  86  *
  87  * Arguments:   @FILE *fp@ = file to print on
  88  *              @off_t n@ = size to be printed
  89  *
  90  * Returns:     ---
  91  *
  92  * Use:         Prints a data size in some reasonable format.  The data size
  93  *              takes up PRHUMAN_DATAWD character spaces.
  94  */
  95
  96 #define PRHUMAN_DATAWD 7
  97
  98 static void prhuman_data(FILE *fp, off_t n)
  99 {
 100   const static struct unit udata[] = {
 101     { " ", 1024 }, { "k", 1024 }, { "M", 1024 }, { "G", 1024 },
 102     { "T", 1024 }, { "P", 1024 }, { "E", 1024 }, { "Z", 1024 },
 103     { "Y",    0 }
 104   };
 105
 106   double x = n;
 107   const struct unit *u = udata;
 108
 109   while (u->m && x >= u->m) { x /= u->m; u++; }
 110   fprintf(fp, "%6.1f%s", x, u->name);
 111 }
 112
 113 /*----- Main code ---------------------------------------------------------*/
 114
 115 #define BARWD 16
 116
 117 /* --- @fprogress_init@ --- *
 118  *
 119  * Arguments:   @fprogress *f@ = progress context to be initialized
 120  *              @const char *name@ = file name string to show
 121  *              @FILE *fp@ = file we're reading from
 122  *
 123  * Returns:     Zero on success, nonzero if the file's state is now broken.
 124  *
 125  * Use:         Initializes a progress context.  Nothing is actually
 126  *              displayed yet.
 127  */
 128
 129 int fprogress_init(fprogress *f, const char *name, FILE *fp)
 130 {
 131   const char *p;
 132   off_t o, sz = -1;
 133   size_t n;
 134
 135   /* --- Set up the offset --- */
 136
 137   if ((o = ftello(fp)) >= 0 &&
 138       fseeko(fp, 0, SEEK_END) >= 0 &&
 139       (sz = ftello(fp),
 140        fseeko(fp, o, SEEK_SET) < 0))
 141     return (-1);
 142   if (o != -1 && sz != -1) sz -= o;
 143   f->o = f->olast = 0; f->sz = sz;
 144
 145   /* --- Set up the file name --- */
 146
 147   n = strlen(name);
 148   if (n < sizeof(f->name))
 149     strcpy(f->name, name);
 150   else if ((p = strchr(name + n - sizeof(f->name) + 4, PATHSEP)) != 0)
 151     sprintf(f->name, "...%s", p);
 152   else {
 153     p = strrchr(name, PATHSEP);
 154     if (!p) sprintf(f->name, "%.*s...", (int)sizeof(f->name) - 4, name);
 155     else sprintf(f->name, "...%.*s...", (int)sizeof(f->name) - 7, p);
 156   }
 157
 158   /* --- Set up some other stuff --- */
 159
 160   f->start = f->last = time(0);
 161   f->bp = baton;
 162
 163   /* --- Done --- */
 164
 165   return (0);
 166 }
 167
 168 /* --- @fprogress_clear@ --- *
 169  *
 170  * Arguments:   @fprogress *f@ = progress context
 171  *
 172  * Returns:     ---
 173  *
 174  * Use:         Clears the progress display from the screen.
 175  */
 176
 177 void fprogress_clear(fprogress *f)
 178 {
 179   fprintf(stderr, "\r%*s\r",
 180           sizeof(f->name) + 2*PRHUMAN_DATAWD + PRHUMAN_TIMEWD + BARWD + 16,
 181           "");
 182 }
 183
 184 /* --- @fprogress_update@ --- *
 185  *
 186  * Arguments:   @fprogress *f@ = progress context
 187  *              @size_t n@ = how much progress has been made
 188  *
 189  * Returns:     ---
 190  *
 191  * Use:         Maybe updates the display to show that some progress has been
 192  *              made.
 193  */
 194
 195 void fprogress_update(fprogress *f, size_t sz)
 196 {
 197   time_t now = time(0);
 198   int i, n;
 199
 200   /* --- See if there's anything to do --- */
 201
 202   f->o += sz;
 203   if (difftime(now, f->last) < 1) return;
 204   f->last = now;
 205
 206   /* --- See if we're going to lose the ETA and percentage indicators --- */
 207
 208   if (f->olast < f->sz && f->o > f->sz) fprogress_clear(f);
 209   f->olast = f->o;
 210
 211   /* --- Do the initial display --- */
 212
 213   fprintf(stderr, "\r%-*s%c ",
 214           (int)sizeof(f->name), f->name,
 215           *f->bp++);
 216   if (!*f->bp) f->bp = baton;
 217   prhuman_data(stderr, f->o);
 218
 219   /* --- More complicated display if we have a set size --- */
 220
 221   if (f->sz > f->o) {
 222     fputc('/', stderr);
 223     prhuman_data(stderr, f->sz);
 224     fputs(" [", stderr);
 225     n = (f->o*BARWD + f->sz/2)/f->sz;
 226     for (i = 0; i < n; i++) fputc('.', stderr);
 227     fprintf(stderr, "%*s] %3d%% ETA ", BARWD - n, "",
 228             (int)((f->o*100 + 50)/f->sz));
 229     prhuman_time(stderr, difftime(now, f->start)*(f->sz - f->o)/f->o);
 230   }
 231 }
 232
 233 /* --- @fprogress_done@ --- *
 234  *
 235  * Arguments:   @fprogress *f@ = progress context
 236  *
 237  * Returns:     ---
 238  *
 239  * Use:         Clear up the progress context and removes any display.
 240  */
 241
 242 void fprogress_done(fprogress *f) { fprogress_clear(f); }
 243
 244 /*----- That's all, folks -------------------------------------------------*/