src/fccache.c

   1 /*
   2  * $XFree86: xc/lib/fontconfig/src/fccache.c,v 1.12 2002/08/22 07:36:44 keithp Exp $
   3  *
   4  * Copyright © 2000 Keith Packard, member of The XFree86 Project, Inc.
   5  *
   6  * Permission to use, copy, modify, distribute, and sell this software and its
   7  * documentation for any purpose is hereby granted without fee, provided that
   8  * the above copyright notice appear in all copies and that both that
   9  * copyright notice and this permission notice appear in supporting
  10  * documentation, and that the name of Keith Packard not be used in
  11  * advertising or publicity pertaining to distribution of the software without
  12  * specific, written prior permission.  Keith Packard makes no
  13  * representations about the suitability of this software for any purpose.  It
  14  * is provided "as is" without express or implied warranty.
  15  *
  16  * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  17  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  18  * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  19  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  20  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  21  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  22  * PERFORMANCE OF THIS SOFTWARE.
  23  */
  24
  25 #include "fcint.h"
  26
  27 /*
  28  * POSIX has broken stdio so that getc must do thread-safe locking,
  29  * this is a serious performance problem for applications doing large
  30  * amounts of IO with getc (as is done here).  If available, use
  31  * the getc_unlocked varient instead.
  32  */
  33
  34 #if defined(getc_unlocked) || defined(_IO_getc_unlocked)
  35 #define GETC(f) getc_unlocked(f)
  36 #define PUTC(c,f) putc_unlocked(c,f)
  37 #else
  38 #define GETC(f) getc(f)
  39 #define PUTC(c,f) putc(c,f)
  40 #endif
  41
  42 #define FC_DBG_CACHE_REF    1024
  43
  44 static FcChar8 *
  45 FcCacheReadString (FILE *f, FcChar8 *dest, int len)
  46 {
  47     int         c;
  48     FcBool      escape;
  49     FcChar8     *d;
  50     int         size;
  51     int         i;
  52
  53     while ((c = GETC (f)) != EOF)
  54         if (c == '"')
  55             break;
  56     if (c == EOF)
  57         return FcFalse;
  58     if (len == 0)
  59         return FcFalse;
  60
  61     size = len;
  62     i = 0;
  63     d = dest;
  64     escape = FcFalse;
  65     while ((c = GETC (f)) != EOF)
  66     {
  67         if (!escape)
  68         {
  69             switch (c) {
  70             case '"':
  71                 c = '\0';
  72                 break;
  73             case '\\':
  74                 escape = FcTrue;
  75                 continue;
  76             }
  77         }
  78         if (i == size)
  79         {
  80             FcChar8 *new = malloc (size * 2);   /* freed in caller */
  81             if (!new)
  82                 break;
  83             memcpy (new, d, size);
  84             size *= 2;
  85             if (d != dest)
  86                 free (d);
  87             d = new;
  88         }
  89         d[i++] = c;
  90         if (c == '\0')
  91             return d;
  92         escape = FcFalse;
  93     }
  94     if (d != dest)
  95         free (d);
  96     return 0;
  97 }
  98
  99 static FcBool
 100 FcCacheReadUlong (FILE *f, unsigned long *dest)
 101 {
 102     unsigned long   t;
 103     int             c;
 104
 105     while ((c = GETC (f)) != EOF)
 106     {
 107         if (!isspace (c))
 108             break;
 109     }
 110     if (c == EOF)
 111         return FcFalse;
 112     t = 0;
 113     for (;;)
 114     {
 115         if (c == EOF || isspace (c))
 116             break;
 117         if (!isdigit (c))
 118             return FcFalse;
 119         t = t * 10 + (c - '0');
 120         c = GETC (f);
 121     }
 122     *dest = t;
 123     return FcTrue;
 124 }
 125
 126 static FcBool
 127 FcCacheReadInt (FILE *f, int *dest)
 128 {
 129     unsigned long   t;
 130     FcBool          ret;
 131
 132     ret = FcCacheReadUlong (f, &t);
 133     if (ret)
 134         *dest = (int) t;
 135     return ret;
 136 }
 137
 138 static FcBool
 139 FcCacheReadTime (FILE *f, time_t *dest)
 140 {
 141     unsigned long   t;
 142     FcBool          ret;
 143
 144     ret = FcCacheReadUlong (f, &t);
 145     if (ret)
 146         *dest = (time_t) t;
 147     return ret;
 148 }
 149
 150 static FcBool
 151 FcCacheWriteChars (FILE *f, const FcChar8 *chars)
 152 {
 153     FcChar8    c;
 154     while ((c = *chars++))
 155     {
 156         switch (c) {
 157         case '"':
 158         case '\\':
 159             if (PUTC ('\\', f) == EOF)
 160                 return FcFalse;
 161             /* fall through */
 162         default:
 163             if (PUTC (c, f) == EOF)
 164                 return FcFalse;
 165         }
 166     }
 167     return FcTrue;
 168 }
 169
 170 static FcBool
 171 FcCacheWriteString (FILE *f, const FcChar8 *string)
 172 {
 173
 174     if (PUTC ('"', f) == EOF)
 175         return FcFalse;
 176     if (!FcCacheWriteChars (f, string))
 177         return FcFalse;
 178     if (PUTC ('"', f) == EOF)
 179         return FcFalse;
 180     return FcTrue;
 181 }
 182
 183 static FcBool
 184 FcCacheWritePath (FILE *f, const FcChar8 *dir, const FcChar8 *file)
 185 {
 186     if (PUTC ('"', f) == EOF)
 187         return FcFalse;
 188     if (dir)
 189         if (!FcCacheWriteChars (f, dir))
 190             return FcFalse;
 191     if (dir && dir[strlen((const char *) dir) - 1] != '/')
 192         if (PUTC ('/', f) == EOF)
 193             return FcFalse;
 194     if (!FcCacheWriteChars (f, file))
 195         return FcFalse;
 196     if (PUTC ('"', f) == EOF)
 197         return FcFalse;
 198     return FcTrue;
 199 }
 200
 201 static FcBool
 202 FcCacheWriteUlong (FILE *f, unsigned long t)
 203 {
 204     int     pow;
 205     unsigned long   temp, digit;
 206
 207     temp = t;
 208     pow = 1;
 209     while (temp >= 10)
 210     {
 211         temp /= 10;
 212         pow *= 10;
 213     }
 214     temp = t;
 215     while (pow)
 216     {
 217         digit = temp / pow;
 218         if (PUTC ((char) digit + '0', f) == EOF)
 219             return FcFalse;
 220         temp = temp - pow * digit;
 221         pow = pow / 10;
 222     }
 223     return FcTrue;
 224 }
 225
 226 static FcBool
 227 FcCacheWriteInt (FILE *f, int i)
 228 {
 229     return FcCacheWriteUlong (f, (unsigned long) i);
 230 }
 231
 232 static FcBool
 233 FcCacheWriteTime (FILE *f, time_t t)
 234 {
 235     return FcCacheWriteUlong (f, (unsigned long) t);
 236 }
 237
 238 static FcBool
 239 FcCacheFontSetAdd (FcFontSet        *set,
 240                    FcStrSet         *dirs,
 241                    const FcChar8    *dir,
 242                    int              dir_len,
 243                    const FcChar8    *file,
 244                    const FcChar8    *name)
 245 {
 246     FcChar8     path_buf[8192], *path;
 247     int         len;
 248     FcBool      ret = FcFalse;
 249     FcPattern   *font;
 250     FcPattern   *frozen;
 251
 252     path = path_buf;
 253     len = (dir_len + 1 + strlen ((const char *) file) + 1);
 254     if (len > sizeof (path_buf))
 255     {
 256         path = malloc (len);    /* freed down below */
 257         if (!path)
 258             return FcFalse;
 259     }
 260     strncpy ((char *) path, (const char *) dir, dir_len);
 261     if (dir[dir_len - 1] != '/')
 262         path[dir_len++] = '/';
 263     strcpy ((char *) path + dir_len, (const char *) file);
 264     if (!FcStrCmp (name, FC_FONT_FILE_DIR))
 265     {
 266         if (FcDebug () & FC_DBG_CACHEV)
 267             printf (" dir cache dir \"%s\"\n", path);
 268         ret = FcStrSetAdd (dirs, path);
 269     }
 270     else if (!FcStrCmp (name, FC_FONT_FILE_INVALID))
 271     {
 272         ret = FcTrue;
 273     }
 274     else
 275     {
 276         font = FcNameParse (name);
 277         if (font)
 278         {
 279             if (FcDebug () & FC_DBG_CACHEV)
 280                 printf (" dir cache file \"%s\"\n", file);
 281             ret = FcPatternAddString (font, FC_FILE, path);
 282             if (ret)
 283             {
 284                 frozen = FcPatternFreeze (font);
 285                 ret = (frozen != 0);
 286                 if (ret)
 287                    ret = FcFontSetAdd (set, frozen);
 288             }
 289             FcPatternDestroy (font);
 290         }
 291     }
 292     if (path != path_buf) free (path);
 293     return ret;
 294
 295 }
 296
 297 static unsigned int
 298 FcCacheHash (const FcChar8 *string, int len)
 299 {
 300     unsigned int    h = 0;
 301     FcChar8         c;
 302
 303     while (len-- && (c = *string++))
 304         h = (h << 1) ^ c;
 305     return h;
 306 }
 307
 308 /*
 309  * Verify the saved timestamp for a file
 310  */
 311 FcBool
 312 FcGlobalCacheCheckTime (FcGlobalCacheInfo *info)
 313 {
 314     struct stat     statb;
 315
 316     if (stat ((char *) info->file, &statb) < 0)
 317     {
 318         if (FcDebug () & FC_DBG_CACHE)
 319             printf (" file missing\n");
 320         return FcFalse;
 321     }
 322     if (statb.st_mtime != info->time)
 323     {
 324         if (FcDebug () & FC_DBG_CACHE)
 325             printf (" timestamp mismatch (was %d is %d)\n",
 326                     (int) info->time, (int) statb.st_mtime);
 327         return FcFalse;
 328     }
 329     return FcTrue;
 330 }
 331
 332 void
 333 FcGlobalCacheReferenced (FcGlobalCache      *cache,
 334                          FcGlobalCacheInfo  *info)
 335 {
 336     if (!info->referenced)
 337     {
 338         info->referenced = FcTrue;
 339         cache->referenced++;
 340         if (FcDebug () & FC_DBG_CACHE_REF)
 341             printf ("Reference %d %s\n", cache->referenced, info->file);
 342     }
 343 }
 344
 345 /*
 346  * Break a path into dir/base elements and compute the base hash
 347  * and the dir length.  This is shared between the functions
 348  * which walk the file caches
 349  */
 350
 351 typedef struct _FcFilePathInfo {
 352     const FcChar8   *dir;
 353     int             dir_len;
 354     const FcChar8   *base;
 355     unsigned int    base_hash;
 356 } FcFilePathInfo;
 357
 358 static FcFilePathInfo
 359 FcFilePathInfoGet (const FcChar8    *path)
 360 {
 361     FcFilePathInfo  i;
 362     FcChar8         *slash;
 363
 364     slash = (FcChar8 *) strrchr ((const char *) path, '/');
 365     if (slash)
 366     {
 367         i.dir = path;
 368         i.dir_len = slash - path;
 369         if (!i.dir_len)
 370             i.dir_len = 1;
 371         i.base = slash + 1;
 372     }
 373     else
 374     {
 375         i.dir = (const FcChar8 *) ".";
 376         i.dir_len = 1;
 377         i.base = path;
 378     }
 379     i.base_hash = FcCacheHash (i.base, -1);
 380     return i;
 381 }
 382
 383 FcGlobalCacheDir *
 384 FcGlobalCacheDirGet (FcGlobalCache  *cache,
 385                      const FcChar8  *dir,
 386                      int            len,
 387                      FcBool         create_missing)
 388 {
 389     unsigned int        hash = FcCacheHash (dir, len);
 390     FcGlobalCacheDir    *d, **prev;
 391
 392     for (prev = &cache->ents[hash % FC_GLOBAL_CACHE_DIR_HASH_SIZE];
 393          (d = *prev);
 394          prev = &(*prev)->next)
 395     {
 396         if (d->info.hash == hash && d->len == len &&
 397             !strncmp ((const char *) d->info.file,
 398                       (const char *) dir, len))
 399             break;
 400     }
 401     if (!(d = *prev))
 402     {
 403         int     i;
 404         if (!create_missing)
 405             return 0;
 406         d = malloc (sizeof (FcGlobalCacheDir) + len + 1);
 407         if (!d)
 408             return 0;
 409         FcMemAlloc (FC_MEM_CACHE, sizeof (FcGlobalCacheDir) + len + 1);
 410         d->next = *prev;
 411         *prev = d;
 412         d->info.hash = hash;
 413         d->info.file = (FcChar8 *) (d + 1);
 414         strncpy ((char *) d->info.file, (const char *) dir, len);
 415         d->info.file[len] = '\0';
 416         d->info.time = 0;
 417         d->info.referenced = FcFalse;
 418         d->len = len;
 419         for (i = 0; i < FC_GLOBAL_CACHE_FILE_HASH_SIZE; i++)
 420             d->ents[i] = 0;
 421         d->subdirs = 0;
 422     }
 423     return d;
 424 }
 425
 426 static FcGlobalCacheInfo *
 427 FcGlobalCacheDirAdd (FcGlobalCache  *cache,
 428                      const FcChar8  *dir,
 429                      time_t         time,
 430                      FcBool         replace)
 431 {
 432     FcGlobalCacheDir    *d;
 433     FcFilePathInfo      i;
 434     FcGlobalCacheSubdir *subdir;
 435     FcGlobalCacheDir    *parent;
 436
 437     /*
 438      * Add this directory to the cache
 439      */
 440     d = FcGlobalCacheDirGet (cache, dir, strlen ((const char *) dir), FcTrue);
 441     if (!d)
 442         return 0;
 443     d->info.time = time;
 444     i = FcFilePathInfoGet (dir);
 445     /*
 446      * Add this directory to the subdirectory list of the parent
 447      */
 448     parent = FcGlobalCacheDirGet (cache, i.dir, i.dir_len, FcTrue);
 449     if (!parent)
 450         return 0;
 451     subdir = malloc (sizeof (FcGlobalCacheSubdir));
 452     if (!subdir)
 453         return 0;
 454     FcMemAlloc (FC_MEM_CACHE, sizeof (FcGlobalCacheSubdir));
 455     subdir->ent = d;
 456     subdir->next = parent->subdirs;
 457     parent->subdirs = subdir;
 458     return &d->info;
 459 }
 460
 461 static void
 462 FcGlobalCacheDirDestroy (FcGlobalCacheDir *d)
 463 {
 464     FcGlobalCacheFile   *f, *next;
 465     int                 h;
 466     FcGlobalCacheSubdir *s, *nexts;
 467
 468     for (h = 0; h < FC_GLOBAL_CACHE_FILE_HASH_SIZE; h++)
 469         for (f = d->ents[h]; f; f = next)
 470         {
 471             next = f->next;
 472             FcMemFree (FC_MEM_CACHE, sizeof (FcGlobalCacheFile) +
 473                        strlen ((char *) f->info.file) + 1 +
 474                        strlen ((char *) f->name) + 1);
 475             free (f);
 476         }
 477     for (s = d->subdirs; s; s = nexts)
 478     {
 479         nexts = s->next;
 480         FcMemFree (FC_MEM_CACHE, sizeof (FcGlobalCacheSubdir));
 481         free (s);
 482     }
 483     FcMemFree (FC_MEM_CACHE, sizeof (FcGlobalCacheDir) + d->len + 1);
 484     free (d);
 485 }
 486
 487 /*
 488  * Check to see if the global cache contains valid data for 'dir'.
 489  * If so, scan the global cache for files and directories in 'dir'.
 490  * else, return False.
 491  */
 492 FcBool
 493 FcGlobalCacheScanDir (FcFontSet         *set,
 494                       FcStrSet          *dirs,
 495                       FcGlobalCache     *cache,
 496                       const FcChar8     *dir)
 497 {
 498     FcGlobalCacheDir    *d = FcGlobalCacheDirGet (cache, dir,
 499                                                   strlen ((const char *) dir),
 500                                                   FcFalse);
 501     FcGlobalCacheFile   *f;
 502     int                 h;
 503     int                 dir_len;
 504     FcGlobalCacheSubdir *subdir;
 505     FcBool              any_in_cache = FcFalse;
 506
 507     if (FcDebug() & FC_DBG_CACHE)
 508         printf ("FcGlobalCacheScanDir %s\n", dir);
 509
 510     if (!d)
 511     {
 512         if (FcDebug () & FC_DBG_CACHE)
 513             printf ("\tNo dir cache entry\n");
 514         return FcFalse;
 515     }
 516
 517     /*
 518      * See if the timestamp recorded in the global cache
 519      * matches the directory time, if not, return False
 520      */
 521     if (!FcGlobalCacheCheckTime (&d->info))
 522     {
 523         if (FcDebug () & FC_DBG_CACHE)
 524             printf ("\tdir cache entry time mismatch\n");
 525         return FcFalse;
 526     }
 527
 528     /*
 529      * Add files from 'dir' to the fontset
 530      */
 531     dir_len = strlen ((const char *) dir);
 532     for (h = 0; h < FC_GLOBAL_CACHE_FILE_HASH_SIZE; h++)
 533         for (f = d->ents[h]; f; f = f->next)
 534         {
 535             if (FcDebug() & FC_DBG_CACHEV)
 536                 printf ("FcGlobalCacheScanDir add file %s\n", f->info.file);
 537             any_in_cache = FcTrue;
 538             if (!FcCacheFontSetAdd (set, dirs, dir, dir_len,
 539                                     f->info.file, f->name))
 540             {
 541                 cache->broken = FcTrue;
 542                 return FcFalse;
 543             }
 544             FcGlobalCacheReferenced (cache, &f->info);
 545         }
 546     /*
 547      * Add directories in 'dir' to 'dirs'
 548      */
 549     for (subdir = d->subdirs; subdir; subdir = subdir->next)
 550     {
 551         FcFilePathInfo  info = FcFilePathInfoGet (subdir->ent->info.file);
 552
 553         any_in_cache = FcTrue;
 554         if (!FcCacheFontSetAdd (set, dirs, dir, dir_len,
 555                                 info.base, FC_FONT_FILE_DIR))
 556         {
 557             cache->broken = FcTrue;
 558             return FcFalse;
 559         }
 560         FcGlobalCacheReferenced (cache, &subdir->ent->info);
 561     }
 562
 563     FcGlobalCacheReferenced (cache, &d->info);
 564
 565     /*
 566      * To recover from a bug in previous versions of fontconfig,
 567      * return FcFalse if no entries in the cache were found
 568      * for this directory.  This will cause any empty directories
 569      * to get rescanned every time fontconfig is initialized.  This
 570      * might get removed at some point when the older cache files are
 571      * presumably fixed.
 572      */
 573     return any_in_cache;
 574 }
 575
 576 /*
 577  * Locate the cache entry for a particular file
 578  */
 579 FcGlobalCacheFile *
 580 FcGlobalCacheFileGet (FcGlobalCache *cache,
 581                       const FcChar8 *file,
 582                       int           id,
 583                       int           *count)
 584 {
 585     FcFilePathInfo      i = FcFilePathInfoGet (file);
 586     FcGlobalCacheDir    *d = FcGlobalCacheDirGet (cache, i.dir,
 587                                                   i.dir_len, FcFalse);
 588     FcGlobalCacheFile   *f, *match = 0;
 589     int                 max = -1;
 590
 591     if (!d)
 592         return 0;
 593     for (f = d->ents[i.base_hash % FC_GLOBAL_CACHE_FILE_HASH_SIZE]; f; f = f->next)
 594     {
 595         if (f->info.hash == i.base_hash &&
 596             !strcmp ((const char *) f->info.file, (const char *) i.base))
 597         {
 598             if (f->id == id)
 599                 match = f;
 600             if (f->id > max)
 601                 max = f->id;
 602         }
 603     }
 604     if (count)
 605         *count = max;
 606     return match;
 607 }
 608
 609 /*
 610  * Add a file entry to the cache
 611  */
 612 static FcGlobalCacheInfo *
 613 FcGlobalCacheFileAdd (FcGlobalCache *cache,
 614                       const FcChar8 *path,
 615                       int           id,
 616                       time_t        time,
 617                       const FcChar8 *name,
 618                       FcBool        replace)
 619 {
 620     FcFilePathInfo      i = FcFilePathInfoGet (path);
 621     FcGlobalCacheDir    *d = FcGlobalCacheDirGet (cache, i.dir,
 622                                                   i.dir_len, FcTrue);
 623     FcGlobalCacheFile   *f, **prev;
 624     int                 size;
 625
 626     if (!d)
 627         return 0;
 628     for (prev = &d->ents[i.base_hash % FC_GLOBAL_CACHE_FILE_HASH_SIZE];
 629          (f = *prev);
 630          prev = &(*prev)->next)
 631     {
 632         if (f->info.hash == i.base_hash &&
 633             f->id == id &&
 634             !strcmp ((const char *) f->info.file, (const char *) i.base))
 635         {
 636             break;
 637         }
 638     }
 639     if (*prev)
 640     {
 641         if (!replace)
 642             return 0;
 643
 644         f = *prev;
 645         if (f->info.referenced)
 646             cache->referenced--;
 647         *prev = f->next;
 648         FcMemFree (FC_MEM_CACHE, sizeof (FcGlobalCacheFile) +
 649                    strlen ((char *) f->info.file) + 1 +
 650                    strlen ((char *) f->name) + 1);
 651         free (f);
 652     }
 653     size = (sizeof (FcGlobalCacheFile) +
 654             strlen ((char *) i.base) + 1 +
 655             strlen ((char *) name) + 1);
 656     f = malloc (size);
 657     if (!f)
 658         return 0;
 659     FcMemAlloc (FC_MEM_CACHE, size);
 660     f->next = *prev;
 661     *prev = f;
 662     f->info.hash = i.base_hash;
 663     f->info.file = (FcChar8 *) (f + 1);
 664     f->info.time = time;
 665     f->info.referenced = FcFalse;
 666     f->id = id;
 667     f->name = f->info.file + strlen ((char *) i.base) + 1;
 668     strcpy ((char *) f->info.file, (const char *) i.base);
 669     strcpy ((char *) f->name, (const char *) name);
 670     return &f->info;
 671 }
 672
 673 FcGlobalCache *
 674 FcGlobalCacheCreate (void)
 675 {
 676     FcGlobalCache   *cache;
 677     int             h;
 678
 679     cache = malloc (sizeof (FcGlobalCache));
 680     if (!cache)
 681         return 0;
 682     FcMemAlloc (FC_MEM_CACHE, sizeof (FcGlobalCache));
 683     for (h = 0; h < FC_GLOBAL_CACHE_DIR_HASH_SIZE; h++)
 684         cache->ents[h] = 0;
 685     cache->entries = 0;
 686     cache->referenced = 0;
 687     cache->updated = FcFalse;
 688     cache->broken = FcFalse;
 689     return cache;
 690 }
 691
 692 void
 693 FcGlobalCacheDestroy (FcGlobalCache *cache)
 694 {
 695     FcGlobalCacheDir    *d, *next;
 696     int                 h;
 697
 698     for (h = 0; h < FC_GLOBAL_CACHE_DIR_HASH_SIZE; h++)
 699     {
 700         for (d = cache->ents[h]; d; d = next)
 701         {
 702             next = d->next;
 703             FcGlobalCacheDirDestroy (d);
 704         }
 705     }
 706     FcMemFree (FC_MEM_CACHE, sizeof (FcGlobalCache));
 707     free (cache);
 708 }
 709
 710 /*
 711  * Cache file syntax is quite simple:
 712  *
 713  * "file_name" id time "font_name" \n
 714  */
 715
 716 void
 717 FcGlobalCacheLoad (FcGlobalCache    *cache,
 718                    const FcChar8    *cache_file)
 719 {
 720     FILE                *f;
 721     FcChar8             file_buf[8192], *file;
 722     int                 id;
 723     time_t              time;
 724     FcChar8             name_buf[8192], *name;
 725     FcGlobalCacheInfo   *info;
 726
 727     f = fopen ((char *) cache_file, "r");
 728     if (!f)
 729         return;
 730
 731     cache->updated = FcFalse;
 732     file = 0;
 733     name = 0;
 734     while ((file = FcCacheReadString (f, file_buf, sizeof (file_buf))) &&
 735            FcCacheReadInt (f, &id) &&
 736            FcCacheReadTime (f, &time) &&
 737            (name = FcCacheReadString (f, name_buf, sizeof (name_buf))))
 738     {
 739         if (FcDebug () & FC_DBG_CACHEV)
 740             printf ("FcGlobalCacheLoad \"%s\" \"%20.20s\"\n", file, name);
 741         if (!FcStrCmp (name, FC_FONT_FILE_DIR))
 742             info = FcGlobalCacheDirAdd (cache, file, time, FcFalse);
 743         else
 744             info = FcGlobalCacheFileAdd (cache, file, id, time, name, FcFalse);
 745         if (!info)
 746             cache->broken = FcTrue;
 747         else
 748             cache->entries++;
 749         if (FcDebug () & FC_DBG_CACHE_REF)
 750             printf ("FcGlobalCacheLoad entry %d %s\n",
 751                     cache->entries, file);
 752         if (file != file_buf)
 753             free (file);
 754         if (name != name_buf)
 755             free (name);
 756         file = 0;
 757         name = 0;
 758     }
 759     if (file && file != file_buf)
 760         free (file);
 761     if (name && name != name_buf)
 762         free (name);
 763     fclose (f);
 764 }
 765
 766 FcBool
 767 FcGlobalCacheUpdate (FcGlobalCache  *cache,
 768                      const FcChar8  *file,
 769                      int            id,
 770                      const FcChar8  *name)
 771 {
 772     const FcChar8       *match;
 773     struct stat         statb;
 774     FcGlobalCacheInfo   *info;
 775
 776     match = file;
 777
 778     if (stat ((char *) file, &statb) < 0)
 779         return FcFalse;
 780     if (S_ISDIR (statb.st_mode))
 781         info = FcGlobalCacheDirAdd (cache, file, statb.st_mtime,
 782                                    FcTrue);
 783     else
 784         info = FcGlobalCacheFileAdd (cache, file, id, statb.st_mtime,
 785                                     name, FcTrue);
 786     if (info)
 787     {
 788         FcGlobalCacheReferenced (cache, info);
 789         cache->updated = FcTrue;
 790     }
 791     else
 792         cache->broken = FcTrue;
 793     return info != 0;
 794 }
 795
 796 FcBool
 797 FcGlobalCacheSave (FcGlobalCache    *cache,
 798                    const FcChar8    *cache_file)
 799 {
 800     FILE                *f;
 801     int                 dir_hash, file_hash;
 802     FcGlobalCacheDir    *dir;
 803     FcGlobalCacheFile   *file;
 804     FcAtomic            *atomic;
 805
 806     if (!cache->updated && cache->referenced == cache->entries)
 807         return FcTrue;
 808
 809     if (cache->broken)
 810         return FcFalse;
 811
 812     /* Set-UID programs can't safely update the cache */
 813     if (getuid () != geteuid ())
 814         return FcFalse;
 815
 816     atomic = FcAtomicCreate (cache_file);
 817     if (!atomic)
 818         goto bail0;
 819     if (!FcAtomicLock (atomic))
 820         goto bail1;
 821     f = fopen ((char *) FcAtomicNewFile(atomic), "w");
 822     if (!f)
 823         goto bail2;
 824
 825     for (dir_hash = 0; dir_hash < FC_GLOBAL_CACHE_DIR_HASH_SIZE; dir_hash++)
 826     {
 827         for (dir = cache->ents[dir_hash]; dir; dir = dir->next)
 828         {
 829             if (!dir->info.referenced)
 830                 continue;
 831             if (!FcCacheWriteString (f, dir->info.file))
 832                 goto bail4;
 833             if (PUTC (' ', f) == EOF)
 834                 goto bail4;
 835             if (!FcCacheWriteInt (f, 0))
 836                 goto bail4;
 837             if (PUTC (' ', f) == EOF)
 838                 goto bail4;
 839             if (!FcCacheWriteTime (f, dir->info.time))
 840                 goto bail4;
 841             if (PUTC (' ', f) == EOF)
 842                 goto bail4;
 843             if (!FcCacheWriteString (f, (FcChar8 *) FC_FONT_FILE_DIR))
 844                 goto bail4;
 845             if (PUTC ('\n', f) == EOF)
 846                 goto bail4;
 847
 848             for (file_hash = 0; file_hash < FC_GLOBAL_CACHE_FILE_HASH_SIZE; file_hash++)
 849             {
 850                 for (file = dir->ents[file_hash]; file; file = file->next)
 851                 {
 852                     if (!file->info.referenced)
 853                         continue;
 854                     if (!FcCacheWritePath (f, dir->info.file, file->info.file))
 855                         goto bail4;
 856                     if (PUTC (' ', f) == EOF)
 857                         goto bail4;
 858                     if (!FcCacheWriteInt (f, file->id < 0 ? 0 : file->id))
 859                         goto bail4;
 860                     if (PUTC (' ', f) == EOF)
 861                         goto bail4;
 862                     if (!FcCacheWriteTime (f, file->info.time))
 863                         goto bail4;
 864                     if (PUTC (' ', f) == EOF)
 865                         goto bail4;
 866                     if (!FcCacheWriteString (f, file->name))
 867                         goto bail4;
 868                     if (PUTC ('\n', f) == EOF)
 869                         goto bail4;
 870                 }
 871             }
 872         }
 873     }
 874
 875     if (fclose (f) == EOF)
 876         goto bail3;
 877
 878     if (!FcAtomicReplaceOrig (atomic))
 879         goto bail3;
 880
 881     FcAtomicUnlock (atomic);
 882     FcAtomicDestroy (atomic);
 883
 884     cache->updated = FcFalse;
 885     return FcTrue;
 886
 887 bail4:
 888     fclose (f);
 889 bail3:
 890     FcAtomicDeleteNew (atomic);
 891 bail2:
 892     FcAtomicUnlock (atomic);
 893 bail1:
 894     FcAtomicDestroy (atomic);
 895 bail0:
 896     return FcFalse;
 897 }
 898
 899 FcBool
 900 FcDirCacheValid (const FcChar8 *dir)
 901 {
 902     FcChar8     *cache_file = FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
 903     struct stat file_stat, dir_stat;
 904
 905     if (stat ((char *) dir, &dir_stat) < 0)
 906     {
 907         FcStrFree (cache_file);
 908         return FcFalse;
 909     }
 910     if (stat ((char *) cache_file, &file_stat) < 0)
 911     {
 912         FcStrFree (cache_file);
 913         return FcFalse;
 914     }
 915     FcStrFree (cache_file);
 916     /*
 917      * If the directory has been modified more recently than
 918      * the cache file, the cache is not valid
 919      */
 920     if (dir_stat.st_mtime - file_stat.st_mtime > 0)
 921         return FcFalse;
 922     return FcTrue;
 923 }
 924
 925 FcBool
 926 FcDirCacheReadDir (FcFontSet *set, FcStrSet *dirs, const FcChar8 *dir)
 927 {
 928     FcChar8         *cache_file = FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
 929     FILE            *f;
 930     FcChar8         *base;
 931     int             id;
 932     int             dir_len;
 933     FcChar8         file_buf[8192], *file;
 934     FcChar8         name_buf[8192], *name;
 935     FcBool          ret = FcFalse;
 936
 937     if (!cache_file)
 938         goto bail0;
 939
 940     if (FcDebug () & FC_DBG_CACHE)
 941         printf ("FcDirCacheReadDir cache_file \"%s\"\n", cache_file);
 942
 943     f = fopen ((char *) cache_file, "r");
 944     if (!f)
 945     {
 946         if (FcDebug () & FC_DBG_CACHE)
 947             printf (" no cache file\n");
 948         goto bail1;
 949     }
 950
 951     if (!FcDirCacheValid (dir))
 952     {
 953         if (FcDebug () & FC_DBG_CACHE)
 954             printf (" cache file older than directory\n");
 955         goto bail2;
 956     }
 957
 958     base = (FcChar8 *) strrchr ((char *) cache_file, '/');
 959     if (!base)
 960         goto bail2;
 961     base++;
 962     dir_len = base - cache_file;
 963
 964     file = 0;
 965     name = 0;
 966     while ((file = FcCacheReadString (f, file_buf, sizeof (file_buf))) &&
 967            FcCacheReadInt (f, &id) &&
 968            (name = FcCacheReadString (f, name_buf, sizeof (name_buf))))
 969     {
 970         if (!FcCacheFontSetAdd (set, dirs, cache_file, dir_len,
 971                                 file, name))
 972             goto bail3;
 973         if (file != file_buf)
 974             free (file);
 975         if (name != name_buf)
 976             free (name);
 977         file = name = 0;
 978     }
 979     if (FcDebug () & FC_DBG_CACHE)
 980         printf (" cache loaded\n");
 981
 982     ret = FcTrue;
 983 bail3:
 984     if (file && file != file_buf)
 985         free (file);
 986     if (name && name != name_buf)
 987         free (name);
 988 bail2:
 989     fclose (f);
 990 bail1:
 991     FcStrFree (cache_file);
 992 bail0:
 993     return ret;
 994 }
 995
 996 /*
 997  * return the path from the directory containing 'cache' to 'file'
 998  */
 999
1000 static const FcChar8 *
1001 FcFileBaseName (const FcChar8 *cache, const FcChar8 *file)
1002 {
1003     const FcChar8   *cache_slash;
1004
1005     cache_slash = (const FcChar8 *) strrchr ((const char *) cache, '/');
1006     if (cache_slash && !strncmp ((const char *) cache, (const char *) file,
1007                                  (cache_slash + 1) - cache))
1008         return file + ((cache_slash + 1) - cache);
1009     return file;
1010 }
1011
1012 FcBool
1013 FcDirCacheWriteDir (FcFontSet *set, FcStrSet *dirs, const FcChar8 *dir)
1014 {
1015     FcChar8         *cache_file = FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
1016     FcPattern       *font;
1017     FILE            *f;
1018     FcChar8         *name;
1019     const FcChar8   *file, *base;
1020     int             n;
1021     int             id;
1022     FcBool          ret;
1023     FcStrList       *list;
1024
1025     if (!cache_file)
1026         goto bail0;
1027     if (FcDebug () & FC_DBG_CACHE)
1028         printf ("FcDirCacheWriteDir cache_file \"%s\"\n", cache_file);
1029
1030     f = fopen ((char *) cache_file, "w");
1031     if (!f)
1032     {
1033         if (FcDebug () & FC_DBG_CACHE)
1034             printf (" can't create \"%s\"\n", cache_file);
1035         goto bail1;
1036     }
1037
1038     list = FcStrListCreate (dirs);
1039     if (!list)
1040         goto bail2;
1041
1042     while ((dir = FcStrListNext (list)))
1043     {
1044         base = FcFileBaseName (cache_file, dir);
1045         if (!FcCacheWriteString (f, base))
1046             goto bail3;
1047         if (PUTC (' ', f) == EOF)
1048             goto bail3;
1049         if (!FcCacheWriteInt (f, 0))
1050             goto bail3;
1051         if (PUTC (' ', f) == EOF)
1052             goto bail3;
1053         if (!FcCacheWriteString (f, FC_FONT_FILE_DIR))
1054             goto bail3;
1055         if (PUTC ('\n', f) == EOF)
1056             goto bail3;
1057     }
1058
1059     for (n = 0; n < set->nfont; n++)
1060     {
1061         font = set->fonts[n];
1062         if (FcPatternGetString (font, FC_FILE, 0, (FcChar8 **) &file) != FcResultMatch)
1063             goto bail3;
1064         base = FcFileBaseName (cache_file, file);
1065         if (FcPatternGetInteger (font, FC_INDEX, 0, &id) != FcResultMatch)
1066             goto bail3;
1067         if (FcDebug () & FC_DBG_CACHEV)
1068             printf (" write file \"%s\"\n", base);
1069         if (!FcCacheWriteString (f, base))
1070             goto bail3;
1071         if (PUTC (' ', f) == EOF)
1072             goto bail3;
1073         if (!FcCacheWriteInt (f, id))
1074             goto bail3;
1075         if (PUTC (' ', f) == EOF)
1076             goto bail3;
1077         name = FcNameUnparse (font);
1078         if (!name)
1079             goto bail3;
1080         ret = FcCacheWriteString (f, name);
1081         FcStrFree (name);
1082         if (!ret)
1083             goto bail3;
1084         if (PUTC ('\n', f) == EOF)
1085             goto bail3;
1086     }
1087
1088     FcStrListDone (list);
1089
1090     if (fclose (f) == EOF)
1091         goto bail1;
1092
1093     FcStrFree (cache_file);
1094
1095     if (FcDebug () & FC_DBG_CACHE)
1096         printf (" cache written\n");
1097     return FcTrue;
1098
1099 bail3:
1100     FcStrListDone (list);
1101 bail2:
1102     fclose (f);
1103 bail1:
1104     unlink ((char *) cache_file);
1105     FcStrFree (cache_file);
1106 bail0:
1107     return FcFalse;
1108 }