mdw@git.distorted.org.uk Git - dvdrip/blob - lib.c

   1 /* -*-c-*-
   2  *
   3  * Common functions for the DVDrip C utilities.
   4  *
   5  * (c) 2022 Mark Wooding
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of the DVD ripping toolset.
  11  *
  12  * DVDrip is free software: you can redistribute it and/or modify it
  13  * under the terms of the GNU General Public License as published by the
  14  * Free Software Foundation; either version 3 of the License, or (at your
  15  * option) any later version.
  16  *
  17  * DVDrip is distributed in the hope that it will be useful, but WITHOUT
  18  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  19  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  20  * for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with DVDrip.  If not, see <https://www.gnu.org/licenses/>.
  24  */
  25
  26 /*----- Header files ------------------------------------------------------*/
  27
  28 #include "lib.h"
  29
  30 /*----- Diagnostics -------------------------------------------------------*/
  31
  32 const char *prog = "<unset>";
  33
  34 void set_prog(const char *p)
  35   { const char *q = strrchr(p, '/'); prog = q ? q + 1 : p; }
  36
  37 void vmoan(const char *fmt, va_list ap)
  38   { vmoan_syserr(0, fmt, ap); }
  39
  40 void vmoan_syserr(int err, const char *fmt, va_list ap)
  41 {
  42   fprintf(stderr, "%s: ", prog);
  43   vfprintf(stderr, fmt, ap);
  44   if (err) fprintf(stderr, ": %s", strerror(errno));
  45   fputc('\n', stderr);
  46 }
  47
  48 void moan(const char *fmt, ...)
  49   { va_list ap; va_start(ap, fmt); vmoan(fmt, ap); va_end(ap); }
  50
  51 void moan_syserr(int err, const char *fmt, ...)
  52   { va_list ap; va_start(ap, fmt); vmoan_syserr(err, fmt, ap); va_end(ap); }
  53
  54 void bail(const char *fmt, ...)
  55   { va_list ap; va_start(ap, fmt); vmoan(fmt, ap); va_end(ap); exit(2); }
  56
  57 void bail_syserr(int err, const char *fmt, ...)
  58 {
  59   va_list ap;
  60
  61   va_start(ap, fmt); vmoan_syserr(err, fmt, ap); va_end(ap);
  62   exit(2);
  63 }
  64
  65 /*----- Parsing utilities -------------------------------------------------*/
  66
  67 double parse_float(const char **p_inout, unsigned f,
  68                    double min, double max, const char *what)
  69 {
  70   const char *p;
  71   char *q;
  72   double x;
  73   int err;
  74
  75   err = errno; errno = 0;
  76   p = *p_inout;
  77   x = strtod(p, &q);
  78   if (errno || x < min || x > max || (!(f&PNF_JUNK) && *q))
  79     bail("bad %s `%s'", what, p);
  80   *p_inout = q; errno = err;
  81   return (x);
  82 }
  83
  84 long parse_int(const char **p_inout, unsigned f,
  85                long min, long max, const char *what)
  86 {
  87   const char *p;
  88   char *q;
  89   long x;
  90   int err;
  91
  92   err = errno; errno = 0;
  93   p = *p_inout;
  94   x = strtoul(p, &q, 0);
  95   if (errno || x < min || x > max || (!(f&PNF_JUNK) && *q))
  96     bail("bad %s `%s'", what, p);
  97   *p_inout = q; errno = err;
  98   return (x);
  99 }
 100
 101 /*----- System utilities --------------------------------------------------*/
 102
 103 void sit(double t)
 104 {
 105   struct timeval tv;
 106   double whole = floor(t);
 107
 108   if (t) {
 109     tv.tv_sec = whole; tv.tv_usec = floor((t - whole)*1.0e6) + 1;
 110     if (select(0, 0, 0, 0, &tv) < 0) bail_syserr(errno, "failed to sleep");
 111   }
 112 }
 113
 114 void carefully_write(int fd, const void *buf, size_t sz)
 115 {
 116   const unsigned char *p = buf;
 117   ssize_t n;
 118
 119   if (fd < 0) return;
 120   while (sz) {
 121     n = write(fd, p, sz);
 122     if (n < 0) {
 123       if (errno == EINTR) continue;
 124       bail_syserr(errno, "failed to write to output file");
 125     }
 126     if (!n) bail("unexpected short write to output file");
 127     p += n; sz -= n;
 128   }
 129 }
 130
 131 void open_file_on_demand(const char *file, FILE **fp_inout, const char *what)
 132 {
 133   FILE *fp;
 134
 135   if (!*fp_inout) {
 136     fp = fopen(file, "w");
 137     if (!fp) bail_syserr(errno, "failed to open %s file `%s'", what, file);
 138     fprintf(fp, "## %s\n\n", what);
 139     *fp_inout = fp;
 140   }
 141 }
 142
 143 void check_write(FILE *fp, const char *what)
 144 {
 145   fflush(fp);
 146   if (ferror(fp)) bail_syserr(errno, "error writing %s file", what);
 147 }
 148
 149 void carefully_fclose(FILE *fp, const char *what)
 150 {
 151   if (fp && (ferror(fp) || fclose(fp)))
 152     bail_syserr(errno, "error writing %s file", what);
 153 }
 154
 155 off_t device_size(int fd, const char *file, int *blksz_out)
 156 {
 157   struct stat st;
 158   uint64_t volsz;
 159
 160   if (fstat(fd, &st))
 161     bail_syserr(errno, "failed to obtain status for `%s'", file);
 162   if (S_ISREG(st.st_mode))
 163     volsz = st.st_size;
 164   else if (S_ISBLK(st.st_mode)) {
 165     if (ioctl(fd, BLKGETSIZE64, &volsz))
 166       bail_syserr(errno, "failed to get volume size for `%s'", file);
 167     if (ioctl(fd, BLKSSZGET, blksz_out))
 168       bail_syserr(errno, "failed to get block size for `%s'", file);
 169   } else
 170     bail("can't read size for `%s': expected file or block device", file);
 171   return ((off_t)volsz);
 172 }
 173
 174 /*----- Progress utilities ------------------------------------------------*/
 175
 176 struct progress_state progress = PROGRESS_STATE_INIT;
 177 static struct banner_progress_item banner_progress;
 178
 179 static void render_banner_progress(struct progress_item *item,
 180                             struct progress_render_state *render)
 181 {
 182   struct banner_progress_item *bi = (struct banner_progress_item *)item;
 183
 184   progress_putleft(render, " %s", bi->msg);
 185   progress_shownotice(render, 4, 7);
 186 }
 187
 188 void show_banner(const char *msg)
 189 {
 190   banner_progress._base.render = render_banner_progress;
 191   progress_additem(&progress, &banner_progress._base);
 192   banner_progress.msg = msg;
 193   progress_update(&progress);
 194 }
 195
 196 void hide_banner(void)
 197 {
 198   if (!progress_removeitem(&progress, &banner_progress._base))
 199     progress_update(&progress);
 200 }
 201
 202 /*----- DVD utilities -----------------------------------------------------*/
 203
 204 #ifdef notdef
 205 static void logfn(void *p, dvd_logger_level_t lev,
 206                   const char *fmt, va_list ap)
 207 {
 208   switch (lev) {
 209     case DVD_LOGGER_LEVEL_ERROR:
 210       fprintf("%s (libdvdread error): ", prog);
 211       break;
 212     case DVD_LOGGER_LEVEL_WARN:
 213       fprintf("%s (libdvdread warning): ", prog);
 214       break;
 215     default:
 216       return;
 217   }
 218   vfprintf(stderr, fmt, ap);
 219   fputc('\n', stderr);
 220 }
 221 static const dvd_logger_cb logger = { logfn };
 222 #endif
 223
 224 void open_dvd(const char *device, int mode,
 225               int *fd_out, dvd_reader_t **dvd_out)
 226 {
 227   int fd;
 228   dvd_reader_t *dvd;
 229   int bannerp = 0;
 230
 231   for (;;) {
 232     fd = open(device, mode);
 233     if (fd >= 0 || errno != ENOMEDIUM) break;
 234     if (!bannerp) {
 235       show_banner("Waiting for disc to be inserted...");
 236       bannerp = 1;
 237     }
 238     sit(0.2);
 239   }
 240   if (bannerp) hide_banner();
 241   if (fd < 0) bail_syserr(errno, "failed to open device `%s'", device);
 242   if (dvd_out) {
 243 #ifdef notdef
 244     dvd = DVDOpen2(0, &logger, device);
 245 #else
 246     dvd = DVDOpen(device);
 247 #endif
 248     if (!dvd) bail("failed to open DVD on `%s'", device);
 249     *dvd_out = dvd;
 250   }
 251   if (fd_out) *fd_out = fd;
 252   else close(fd);
 253 }
 254
 255 void store_filename(char *buf, ident id)
 256 {
 257   switch (id_kind(id)) {
 258     case RAW:
 259       sprintf(buf, "#<raw device>");
 260       break;
 261     case IFO:
 262       if (!id_title(id)) sprintf(buf, "/VIDEO_TS/VIDEO_TS.IFO");
 263       else sprintf(buf, "/VIDEO_TS/VTS_%02u_0.IFO", id_title(id));
 264       break;
 265     case BUP:
 266       if (!id_title(id)) sprintf(buf, "/VIDEO_TS/VIDEO_TS.BUP");
 267       else sprintf(buf, "/VIDEO_TS/VTS_%02u_0.BUP", id_title(id));
 268       break;
 269     case VOB:
 270       if (!id_title(id)) sprintf(buf, "/VIDEO_TS/VIDEO_TS.VOB");
 271       else
 272         sprintf(buf, "/VIDEO_TS/VTS_%02u_%u.VOB", id_title(id), id_part(id));
 273       break;
 274     default:
 275       abort();
 276   }
 277 }
 278
 279 static char *copy_string(char *p, const char *q)
 280 {
 281   while (*q) *p++ = *q++;
 282   *p = 0; return (p);
 283 }
 284
 285 static char *copy_hex(char *p, const unsigned char *q, size_t sz)
 286 {
 287   while (sz) {
 288     sprintf(p, "%02x", *q);
 289     p += 2; q++; sz--;
 290   }
 291   return (p);
 292 }
 293
 294 int dvd_id(char *p, dvd_reader_t *dvd, unsigned f, const char *file)
 295 {
 296   char volid[33];
 297   unsigned char volsetid[16], discid[16];
 298   int rc;
 299   size_t n;
 300
 301   rc = DVDUDFVolumeInfo(dvd,
 302                         volid, sizeof(volid),
 303                         volsetid, sizeof(volsetid));
 304   if (!rc) {
 305     p = copy_string(p, volid);
 306     *p++ = '-';
 307     for (n = sizeof(volsetid); n && !volsetid[n - 1]; n--);
 308     p = copy_hex(p, volsetid, n);
 309   } else if (f&DIF_MUSTVOLINF) {
 310     if (file) moan("failed to read volume info for `%s'", file);
 311     else moan("failed to read volume info");
 312     return (-1);
 313   } else
 314     p = copy_string(p, "<error reading volume info>");
 315
 316   *p++ = ':';
 317   rc = DVDDiscID(dvd, discid);
 318   if (!rc)
 319     p = copy_hex(p, discid, sizeof(discid));
 320   else if (f&DIF_MUSTIFOHASH) {
 321     if (file) moan("failed to determine disc id of `%s'", file);
 322     else moan("failed to determine disc id");
 323     return (-1);
 324   } else
 325     p = copy_string(p, "<error reading disc-id>");
 326
 327   return (0);
 328 }
 329
 330 /*----- That's all, folks -------------------------------------------------*/