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)
 299 {
 300     unsigned int    h = 0;
 301     FcChar8         c;
 302
 303     while ((c = *string++))
 304         h = (h << 1) ^ c;
 305     return 0;
 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);
 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);
 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 FcBool
 488 FcGlobalCacheScanDir (FcFontSet         *set,
 489                       FcStrSet          *dirs,
 490                       FcGlobalCache     *cache,
 491                       const FcChar8     *dir)
 492 {
 493     FcGlobalCacheDir    *d = FcGlobalCacheDirGet (cache, dir,
 494                                                   strlen ((const char *) dir),
 495                                                   FcFalse);
 496     FcGlobalCacheFile   *f;
 497     int                 h;
 498     int                 dir_len;
 499     FcGlobalCacheSubdir *subdir;
 500
 501     if (FcDebug() & FC_DBG_CACHE)
 502         printf ("FcGlobalCacheScanDir %s\n", dir);
 503
 504     if (!d)
 505     {
 506         if (FcDebug () & FC_DBG_CACHE)
 507             printf ("\tNo dir cache entry\n");
 508         return FcFalse;
 509     }
 510
 511     if (!FcGlobalCacheCheckTime (&d->info))
 512     {
 513         if (FcDebug () & FC_DBG_CACHE)
 514             printf ("\tdir cache entry time mismatch\n");
 515         return FcFalse;
 516     }
 517
 518     dir_len = strlen ((const char *) dir);
 519     for (h = 0; h < FC_GLOBAL_CACHE_FILE_HASH_SIZE; h++)
 520         for (f = d->ents[h]; f; f = f->next)
 521         {
 522             if (FcDebug() & FC_DBG_CACHEV)
 523                 printf ("FcGlobalCacheScanDir add file %s\n", f->info.file);
 524             if (!FcCacheFontSetAdd (set, dirs, dir, dir_len,
 525                                     f->info.file, f->name))
 526             {
 527                 cache->broken = FcTrue;
 528                 return FcFalse;
 529             }
 530             FcGlobalCacheReferenced (cache, &f->info);
 531         }
 532     for (subdir = d->subdirs; subdir; subdir = subdir->next)
 533     {
 534         FcFilePathInfo  info = FcFilePathInfoGet (subdir->ent->info.file);
 535
 536         if (!FcCacheFontSetAdd (set, dirs, dir, dir_len,
 537                                 info.base, FC_FONT_FILE_DIR))
 538         {
 539             cache->broken = FcTrue;
 540             return FcFalse;
 541         }
 542         FcGlobalCacheReferenced (cache, &subdir->ent->info);
 543     }
 544
 545     FcGlobalCacheReferenced (cache, &d->info);
 546
 547     return FcTrue;
 548 }
 549
 550 /*
 551  * Locate the cache entry for a particular file
 552  */
 553 FcGlobalCacheFile *
 554 FcGlobalCacheFileGet (FcGlobalCache *cache,
 555                       const FcChar8 *file,
 556                       int           id,
 557                       int           *count)
 558 {
 559     FcFilePathInfo      i = FcFilePathInfoGet (file);
 560     FcGlobalCacheDir    *d = FcGlobalCacheDirGet (cache, i.dir,
 561                                                   i.dir_len, FcFalse);
 562     FcGlobalCacheFile   *f, *match = 0;
 563     int                 max = -1;
 564
 565     if (!d)
 566         return 0;
 567     for (f = d->ents[i.base_hash % FC_GLOBAL_CACHE_FILE_HASH_SIZE]; f; f = f->next)
 568     {
 569         if (f->info.hash == i.base_hash &&
 570             !strcmp ((const char *) f->info.file, (const char *) i.base))
 571         {
 572             if (f->id == id)
 573                 match = f;
 574             if (f->id > max)
 575                 max = f->id;
 576         }
 577     }
 578     if (count)
 579         *count = max;
 580     return match;
 581 }
 582
 583 /*
 584  * Add a file entry to the cache
 585  */
 586 static FcGlobalCacheInfo *
 587 FcGlobalCacheFileAdd (FcGlobalCache *cache,
 588                       const FcChar8 *path,
 589                       int           id,
 590                       time_t        time,
 591                       const FcChar8 *name,
 592                       FcBool        replace)
 593 {
 594     FcFilePathInfo      i = FcFilePathInfoGet (path);
 595     FcGlobalCacheDir    *d = FcGlobalCacheDirGet (cache, i.dir,
 596                                                   i.dir_len, FcTrue);
 597     FcGlobalCacheFile   *f, **prev;
 598     int                 size;
 599
 600     if (!d)
 601         return 0;
 602     for (prev = &d->ents[i.base_hash % FC_GLOBAL_CACHE_FILE_HASH_SIZE];
 603          (f = *prev);
 604          prev = &(*prev)->next)
 605     {
 606         if (f->info.hash == i.base_hash &&
 607             f->id == id &&
 608             !strcmp ((const char *) f->info.file, (const char *) i.base))
 609         {
 610             break;
 611         }
 612     }
 613     if (*prev)
 614     {
 615         if (!replace)
 616             return 0;
 617
 618         f = *prev;
 619         if (f->info.referenced)
 620             cache->referenced--;
 621         *prev = f->next;
 622         FcMemFree (FC_MEM_CACHE, sizeof (FcGlobalCacheFile) +
 623                    strlen ((char *) f->info.file) + 1 +
 624                    strlen ((char *) f->name) + 1);
 625         free (f);
 626     }
 627     size = (sizeof (FcGlobalCacheFile) +
 628             strlen ((char *) i.base) + 1 +
 629             strlen ((char *) name) + 1);
 630     f = malloc (size);
 631     if (!f)
 632         return 0;
 633     FcMemAlloc (FC_MEM_CACHE, size);
 634     f->next = *prev;
 635     *prev = f;
 636     f->info.hash = i.base_hash;
 637     f->info.file = (FcChar8 *) (f + 1);
 638     f->info.time = time;
 639     f->info.referenced = FcFalse;
 640     f->id = id;
 641     f->name = f->info.file + strlen ((char *) i.base) + 1;
 642     strcpy ((char *) f->info.file, (const char *) i.base);
 643     strcpy ((char *) f->name, (const char *) name);
 644     return &f->info;
 645 }
 646
 647 FcGlobalCache *
 648 FcGlobalCacheCreate (void)
 649 {
 650     FcGlobalCache   *cache;
 651     int             h;
 652
 653     cache = malloc (sizeof (FcGlobalCache));
 654     if (!cache)
 655         return 0;
 656     FcMemAlloc (FC_MEM_CACHE, sizeof (FcGlobalCache));
 657     for (h = 0; h < FC_GLOBAL_CACHE_DIR_HASH_SIZE; h++)
 658         cache->ents[h] = 0;
 659     cache->entries = 0;
 660     cache->referenced = 0;
 661     cache->updated = FcFalse;
 662     cache->broken = FcFalse;
 663     return cache;
 664 }
 665
 666 void
 667 FcGlobalCacheDestroy (FcGlobalCache *cache)
 668 {
 669     FcGlobalCacheDir    *d, *next;
 670     int                 h;
 671
 672     for (h = 0; h < FC_GLOBAL_CACHE_DIR_HASH_SIZE; h++)
 673     {
 674         for (d = cache->ents[h]; d; d = next)
 675         {
 676             next = d->next;
 677             FcGlobalCacheDirDestroy (d);
 678         }
 679     }
 680     FcMemFree (FC_MEM_CACHE, sizeof (FcGlobalCache));
 681     free (cache);
 682 }
 683
 684 /*
 685  * Cache file syntax is quite simple:
 686  *
 687  * "file_name" id time "font_name" \n
 688  */
 689
 690 void
 691 FcGlobalCacheLoad (FcGlobalCache    *cache,
 692                    const FcChar8    *cache_file)
 693 {
 694     FILE                *f;
 695     FcChar8             file_buf[8192], *file;
 696     int                 id;
 697     time_t              time;
 698     FcChar8             name_buf[8192], *name;
 699     FcGlobalCacheInfo   *info;
 700
 701     f = fopen ((char *) cache_file, "r");
 702     if (!f)
 703         return;
 704
 705     cache->updated = FcFalse;
 706     file = 0;
 707     name = 0;
 708     while ((file = FcCacheReadString (f, file_buf, sizeof (file_buf))) &&
 709            FcCacheReadInt (f, &id) &&
 710            FcCacheReadTime (f, &time) &&
 711            (name = FcCacheReadString (f, name_buf, sizeof (name_buf))))
 712     {
 713         if (FcDebug () & FC_DBG_CACHEV)
 714             printf ("FcGlobalCacheLoad \"%s\" \"%20.20s\"\n", file, name);
 715         if (!FcStrCmp (name, FC_FONT_FILE_DIR))
 716             info = FcGlobalCacheDirAdd (cache, file, time, FcFalse);
 717         else
 718             info = FcGlobalCacheFileAdd (cache, file, id, time, name, FcFalse);
 719         if (!info)
 720             cache->broken = FcTrue;
 721         else
 722             cache->entries++;
 723         if (FcDebug () & FC_DBG_CACHE_REF)
 724             printf ("FcGlobalCacheLoad entry %d %s\n",
 725                     cache->entries, file);
 726         if (file != file_buf)
 727             free (file);
 728         if (name != name_buf)
 729             free (name);
 730         file = 0;
 731         name = 0;
 732     }
 733     if (file && file != file_buf)
 734         free (file);
 735     if (name && name != name_buf)
 736         free (name);
 737     fclose (f);
 738 }
 739
 740 FcBool
 741 FcGlobalCacheUpdate (FcGlobalCache  *cache,
 742                      const FcChar8  *file,
 743                      int            id,
 744                      const FcChar8  *name)
 745 {
 746     const FcChar8       *match;
 747     struct stat         statb;
 748     FcGlobalCacheInfo   *info;
 749
 750     match = file;
 751
 752     if (stat ((char *) file, &statb) < 0)
 753         return FcFalse;
 754     if (S_ISDIR (statb.st_mode))
 755         info = FcGlobalCacheDirAdd (cache, file, statb.st_mtime,
 756                                    FcTrue);
 757     else
 758         info = FcGlobalCacheFileAdd (cache, file, id, statb.st_mtime,
 759                                     name, FcTrue);
 760     if (info)
 761     {
 762         FcGlobalCacheReferenced (cache, info);
 763         cache->updated = FcTrue;
 764     }
 765     else
 766         cache->broken = FcTrue;
 767     return info != 0;
 768 }
 769
 770 FcBool
 771 FcGlobalCacheSave (FcGlobalCache    *cache,
 772                    const FcChar8    *cache_file)
 773 {
 774     FILE                *f;
 775     int                 dir_hash, file_hash;
 776     FcGlobalCacheDir    *dir;
 777     FcGlobalCacheFile   *file;
 778     FcAtomic            *atomic;
 779
 780     if (!cache->updated && cache->referenced == cache->entries)
 781         return FcTrue;
 782
 783     if (cache->broken)
 784         return FcFalse;
 785
 786     /* Set-UID programs can't safely update the cache */
 787     if (getuid () != geteuid ())
 788         return FcFalse;
 789
 790     atomic = FcAtomicCreate (cache_file);
 791     if (!atomic)
 792         goto bail0;
 793     if (!FcAtomicLock (atomic))
 794         goto bail1;
 795     f = fopen ((char *) FcAtomicNewFile(atomic), "w");
 796     if (!f)
 797         goto bail2;
 798
 799     for (dir_hash = 0; dir_hash < FC_GLOBAL_CACHE_DIR_HASH_SIZE; dir_hash++)
 800     {
 801         for (dir = cache->ents[dir_hash]; dir; dir = dir->next)
 802         {
 803             if (!dir->info.referenced)
 804                 continue;
 805             if (!FcCacheWriteString (f, dir->info.file))
 806                 goto bail4;
 807             if (PUTC (' ', f) == EOF)
 808                 goto bail4;
 809             if (!FcCacheWriteInt (f, 0))
 810                 goto bail4;
 811             if (PUTC (' ', f) == EOF)
 812                 goto bail4;
 813             if (!FcCacheWriteTime (f, dir->info.time))
 814                 goto bail4;
 815             if (PUTC (' ', f) == EOF)
 816                 goto bail4;
 817             if (!FcCacheWriteString (f, (FcChar8 *) FC_FONT_FILE_DIR))
 818                 goto bail4;
 819             if (PUTC ('\n', f) == EOF)
 820                 goto bail4;
 821
 822             for (file_hash = 0; file_hash < FC_GLOBAL_CACHE_FILE_HASH_SIZE; file_hash++)
 823             {
 824                 for (file = dir->ents[file_hash]; file; file = file->next)
 825                 {
 826                     if (!file->info.referenced)
 827                         continue;
 828                     if (!FcCacheWritePath (f, dir->info.file, file->info.file))
 829                         goto bail4;
 830                     if (PUTC (' ', f) == EOF)
 831                         goto bail4;
 832                     if (!FcCacheWriteInt (f, file->id < 0 ? 0 : file->id))
 833                         goto bail4;
 834                     if (PUTC (' ', f) == EOF)
 835                         goto bail4;
 836                     if (!FcCacheWriteTime (f, file->info.time))
 837                         goto bail4;
 838                     if (PUTC (' ', f) == EOF)
 839                         goto bail4;
 840                     if (!FcCacheWriteString (f, file->name))
 841                         goto bail4;
 842                     if (PUTC ('\n', f) == EOF)
 843                         goto bail4;
 844                 }
 845             }
 846         }
 847     }
 848
 849     if (fclose (f) == EOF)
 850         goto bail3;
 851
 852     if (!FcAtomicReplaceOrig (atomic))
 853         goto bail3;
 854
 855     FcAtomicUnlock (atomic);
 856     FcAtomicDestroy (atomic);
 857
 858     cache->updated = FcFalse;
 859     return FcTrue;
 860
 861 bail4:
 862     fclose (f);
 863 bail3:
 864     FcAtomicDeleteNew (atomic);
 865 bail2:
 866     FcAtomicUnlock (atomic);
 867 bail1:
 868     FcAtomicDestroy (atomic);
 869 bail0:
 870     return FcFalse;
 871 }
 872
 873 FcBool
 874 FcDirCacheValid (const FcChar8 *dir)
 875 {
 876     FcChar8     *cache_file = FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
 877     struct stat file_stat, dir_stat;
 878
 879     if (stat ((char *) dir, &dir_stat) < 0)
 880     {
 881         FcStrFree (cache_file);
 882         return FcFalse;
 883     }
 884     if (stat ((char *) cache_file, &file_stat) < 0)
 885     {
 886         FcStrFree (cache_file);
 887         return FcFalse;
 888     }
 889     FcStrFree (cache_file);
 890     /*
 891      * If the directory has been modified more recently than
 892      * the cache file, the cache is not valid
 893      */
 894     if (dir_stat.st_mtime - file_stat.st_mtime > 0)
 895         return FcFalse;
 896     return FcTrue;
 897 }
 898
 899 FcBool
 900 FcDirCacheReadDir (FcFontSet *set, FcStrSet *dirs, const FcChar8 *dir)
 901 {
 902     FcChar8         *cache_file = FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
 903     FILE            *f;
 904     FcChar8         *base;
 905     int             id;
 906     int             dir_len;
 907     FcChar8         file_buf[8192], *file;
 908     FcChar8         name_buf[8192], *name;
 909     FcBool          ret = FcFalse;
 910
 911     if (!cache_file)
 912         goto bail0;
 913
 914     if (FcDebug () & FC_DBG_CACHE)
 915         printf ("FcDirCacheReadDir cache_file \"%s\"\n", cache_file);
 916
 917     f = fopen ((char *) cache_file, "r");
 918     if (!f)
 919     {
 920         if (FcDebug () & FC_DBG_CACHE)
 921             printf (" no cache file\n");
 922         goto bail1;
 923     }
 924
 925     if (!FcDirCacheValid (dir))
 926     {
 927         if (FcDebug () & FC_DBG_CACHE)
 928             printf (" cache file older than directory\n");
 929         goto bail2;
 930     }
 931
 932     base = (FcChar8 *) strrchr ((char *) cache_file, '/');
 933     if (!base)
 934         goto bail2;
 935     base++;
 936     dir_len = base - cache_file;
 937
 938     file = 0;
 939     name = 0;
 940     while ((file = FcCacheReadString (f, file_buf, sizeof (file_buf))) &&
 941            FcCacheReadInt (f, &id) &&
 942            (name = FcCacheReadString (f, name_buf, sizeof (name_buf))))
 943     {
 944         if (!FcCacheFontSetAdd (set, dirs, cache_file, dir_len,
 945                                 file, name))
 946             goto bail3;
 947         if (file != file_buf)
 948             free (file);
 949         if (name != name_buf)
 950             free (name);
 951         file = name = 0;
 952     }
 953     if (FcDebug () & FC_DBG_CACHE)
 954         printf (" cache loaded\n");
 955
 956     ret = FcTrue;
 957 bail3:
 958     if (file && file != file_buf)
 959         free (file);
 960     if (name && name != name_buf)
 961         free (name);
 962 bail2:
 963     fclose (f);
 964 bail1:
 965     FcStrFree (cache_file);
 966 bail0:
 967     return ret;
 968 }
 969
 970 /*
 971  * return the path from the directory containing 'cache' to 'file'
 972  */
 973
 974 static const FcChar8 *
 975 FcFileBaseName (const FcChar8 *cache, const FcChar8 *file)
 976 {
 977     const FcChar8   *cache_slash;
 978
 979     cache_slash = (const FcChar8 *) strrchr ((const char *) cache, '/');
 980     if (cache_slash && !strncmp ((const char *) cache, (const char *) file,
 981                                  (cache_slash + 1) - cache))
 982         return file + ((cache_slash + 1) - cache);
 983     return file;
 984 }
 985
 986 FcBool
 987 FcDirCacheWriteDir (FcFontSet *set, FcStrSet *dirs, const FcChar8 *dir)
 988 {
 989     FcChar8         *cache_file = FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
 990     FcPattern       *font;
 991     FILE            *f;
 992     FcChar8         *name;
 993     const FcChar8   *file, *base;
 994     int             n;
 995     int             id;
 996     FcBool          ret;
 997     FcStrList       *list;
 998
 999     if (!cache_file)
1000         goto bail0;
1001     if (FcDebug () & FC_DBG_CACHE)
1002         printf ("FcDirCacheWriteDir cache_file \"%s\"\n", cache_file);
1003
1004     f = fopen ((char *) cache_file, "w");
1005     if (!f)
1006     {
1007         if (FcDebug () & FC_DBG_CACHE)
1008             printf (" can't create \"%s\"\n", cache_file);
1009         goto bail1;
1010     }
1011
1012     list = FcStrListCreate (dirs);
1013     if (!list)
1014         goto bail2;
1015
1016     while ((dir = FcStrListNext (list)))
1017     {
1018         base = FcFileBaseName (cache_file, dir);
1019         if (!FcCacheWriteString (f, base))
1020             goto bail3;
1021         if (PUTC (' ', f) == EOF)
1022             goto bail3;
1023         if (!FcCacheWriteInt (f, 0))
1024             goto bail3;
1025         if (PUTC (' ', f) == EOF)
1026             goto bail3;
1027         if (!FcCacheWriteString (f, FC_FONT_FILE_DIR))
1028             goto bail3;
1029         if (PUTC ('\n', f) == EOF)
1030             goto bail3;
1031     }
1032
1033     for (n = 0; n < set->nfont; n++)
1034     {
1035         font = set->fonts[n];
1036         if (FcPatternGetString (font, FC_FILE, 0, (FcChar8 **) &file) != FcResultMatch)
1037             goto bail3;
1038         base = FcFileBaseName (cache_file, file);
1039         if (FcPatternGetInteger (font, FC_INDEX, 0, &id) != FcResultMatch)
1040             goto bail3;
1041         if (FcDebug () & FC_DBG_CACHEV)
1042             printf (" write file \"%s\"\n", base);
1043         if (!FcCacheWriteString (f, base))
1044             goto bail3;
1045         if (PUTC (' ', f) == EOF)
1046             goto bail3;
1047         if (!FcCacheWriteInt (f, id))
1048             goto bail3;
1049         if (PUTC (' ', f) == EOF)
1050             goto bail3;
1051         name = FcNameUnparse (font);
1052         if (!name)
1053             goto bail3;
1054         ret = FcCacheWriteString (f, name);
1055         FcStrFree (name);
1056         if (!ret)
1057             goto bail3;
1058         if (PUTC ('\n', f) == EOF)
1059             goto bail3;
1060     }
1061
1062     FcStrListDone (list);
1063
1064     if (fclose (f) == EOF)
1065         goto bail1;
1066
1067     FcStrFree (cache_file);
1068
1069     if (FcDebug () & FC_DBG_CACHE)
1070         printf (" cache written\n");
1071     return FcTrue;
1072
1073 bail3:
1074     FcStrListDone (list);
1075 bail2:
1076     fclose (f);
1077 bail1:
1078     unlink ((char *) cache_file);
1079     FcStrFree (cache_file);
1080 bail0:
1081     return FcFalse;
1082 }