lang/php7/patches/0013-Add-support-for-use-of-the-system-timezone-database.patch

   1 From: Joe Orton <jorton@redhat.com>
   2 Date: Thu, 20 Oct 2016 11:44:14 +0200
   3 Subject: Add support for use of the system timezone database
   4
   5 Add support for use of the system timezone database, rather
   6 than embedding a copy.  Discussed upstream but was not desired.
   7
   8 History:
   9 r14: improve check for valid tz file
  10 r13: adapt for upstream changes to use PHP allocator
  11 r12: adapt for upstream changes for new zic
  12 r11: use canonical names to avoid more case sensitivity issues
  13      round lat/long from zone.tab towards zero per builtin db
  14 r10: make timezone case insensitive
  15 r9: fix another compile error without --with-system-tzdata configured (Michael Heimpold)
  16 r8: fix compile error without --with-system-tzdata configured
  17 r7: improve check for valid timezone id to exclude directories
  18 r6: fix fd leak in r5, fix country code/BC flag use in
  19     timezone_identifiers_list() using system db,
  20     fix use of PECL timezonedb to override system db,
  21 r5: reverts addition of "System/Localtime" fake tzname.
  22     updated for 5.3.0, parses zone.tab to pick up mapping between
  23     timezone name, country code and long/lat coords
  24 r4: added "System/Localtime" tzname which uses /etc/localtime
  25 r3: fix a crash if /usr/share/zoneinfo doesn't exist (Raphael Geissert)
  26 r2: add filesystem trawl to set up name alias index
  27 r1: initial revision
  28 ---
  29  ext/date/lib/parse_tz.c | 560 +++++++++++++++++++++++++++++++++++++++++++++++-
  30  ext/date/lib/timelib.m4 |  13 ++
  31  2 files changed, 562 insertions(+), 11 deletions(-)
  32
  33 diff --git a/ext/date/lib/parse_tz.c b/ext/date/lib/parse_tz.c
  34 index 20d7eea..ed7717e 100644
  35 --- a/ext/date/lib/parse_tz.c
  36 +++ b/ext/date/lib/parse_tz.c
  37 @@ -24,6 +24,16 @@
  38
  39  #include "timelib.h"
  40
  41 +#ifdef HAVE_SYSTEM_TZDATA
  42 +#include <sys/mman.h>
  43 +#include <sys/stat.h>
  44 +#include <limits.h>
  45 +#include <fcntl.h>
  46 +#include <unistd.h>
  47 +
  48 +#include "php_scandir.h"
  49 +#endif
  50 +
  51  #include <stdio.h>
  52
  53  #ifdef HAVE_LOCALE_H
  54 @@ -36,8 +46,12 @@
  55  #include <strings.h>
  56  #endif
  57
  58 +#ifndef HAVE_SYSTEM_TZDATA
  59  #define TIMELIB_SUPPORTS_V2DATA
  60  #include "timezonedb.h"
  61 +#endif
  62 +
  63 +#include <ctype.h>
  64
  65  #if (defined(__APPLE__) || defined(__APPLE_CC__)) && (defined(__BIG_ENDIAN__) || defined(__LITTLE_ENDIAN__))
  66  # if defined(__LITTLE_ENDIAN__)
  67 @@ -59,6 +73,11 @@ static int read_preamble(const unsigned char **tzf, timelib_tzinfo *tz)
  68  {
  69         uint32_t version;
  70
  71 +       if (memcmp(*tzf, "TZif", 4) == 0) {
  72 +               *tzf += 20;
  73 +               return 0;
  74 +       }
  75 +
  76         /* read ID */
  77         version = (*tzf)[3] - '0';
  78         *tzf += 4;
  79 @@ -302,7 +321,429 @@ void timelib_dump_tzinfo(timelib_tzinfo *tz)
  80         }
  81  }
  82
  83 -static int seek_to_tz_position(const unsigned char **tzf, char *timezone, const timelib_tzdb *tzdb)
  84 +#ifdef HAVE_SYSTEM_TZDATA
  85 +
  86 +#ifdef HAVE_SYSTEM_TZDATA_PREFIX
  87 +#define ZONEINFO_PREFIX HAVE_SYSTEM_TZDATA_PREFIX
  88 +#else
  89 +#define ZONEINFO_PREFIX "/usr/share/zoneinfo"
  90 +#endif
  91 +
  92 +/* System timezone database pointer. */
  93 +static const timelib_tzdb *timezonedb_system;
  94 +
  95 +/* Hash table entry for the cache of the zone.tab mapping table. */
  96 +struct location_info {
  97 +        char code[2];
  98 +        double latitude, longitude;
  99 +        char name[64];
 100 +        char *comment;
 101 +        struct location_info *next;
 102 +};
 103 +
 104 +/* Cache of zone.tab. */
 105 +static struct location_info **system_location_table;
 106 +
 107 +/* Size of the zone.tab hash table; a random-ish prime big enough to
 108 + * prevent too many collisions. */
 109 +#define LOCINFO_HASH_SIZE (1021)
 110 +
 111 +/* Compute a case insensitive hash of str */
 112 +static uint32_t tz_hash(const char *str)
 113 +{
 114 +    const unsigned char *p = (const unsigned char *)str;
 115 +    uint32_t hash = 5381;
 116 +    int c;
 117 +
 118 +    while ((c = tolower(*p++)) != '\0') {
 119 +        hash = (hash << 5) ^ hash ^ c;
 120 +    }
 121 +
 122 +    return hash % LOCINFO_HASH_SIZE;
 123 +}
 124 +
 125 +/* Parse an ISO-6709 date as used in zone.tab. Returns end of the
 126 + * parsed string on success, or NULL on parse error.  On success,
 127 + * writes the parsed number to *result. */
 128 +static char *parse_iso6709(char *p, double *result)
 129 +{
 130 +    double v, sign;
 131 +    char *pend;
 132 +    size_t len;
 133 +
 134 +    if (*p == '+')
 135 +        sign = 1.0;
 136 +    else if (*p == '-')
 137 +        sign = -1.0;
 138 +    else
 139 +        return NULL;
 140 +
 141 +    p++;
 142 +    for (pend = p; *pend >= '0' && *pend <= '9'; pend++)
 143 +        ;;
 144 +
 145 +    /* Annoying encoding used by zone.tab has no decimal point, so use
 146 +     * the length to determine the format:
 147 +     *
 148 +     * 4 = DDMM
 149 +     * 5 = DDDMM
 150 +     * 6 = DDMMSS
 151 +     * 7 = DDDMMSS
 152 +     */
 153 +    len = pend - p;
 154 +    if (len < 4 || len > 7) {
 155 +        return NULL;
 156 +    }
 157 +
 158 +    /* p => [D]DD */
 159 +    v = (p[0] - '0') * 10.0 + (p[1] - '0');
 160 +    p += 2;
 161 +    if (len == 5 || len == 7)
 162 +        v = v * 10.0 + (*p++ - '0');
 163 +    /* p => MM[SS] */
 164 +    v += (10.0 * (p[0] - '0')
 165 +          + p[1] - '0') / 60.0;
 166 +    p += 2;
 167 +    /* p => [SS] */
 168 +    if (len > 5) {
 169 +        v += (10.0 * (p[0] - '0')
 170 +              + p[1] - '0') / 3600.0;
 171 +        p += 2;
 172 +    }
 173 +
 174 +    /* Round to five decimal place, not because it's a good idea,
 175 +     * but, because the builtin data uses rounded data, so, match
 176 +     * that. */
 177 +    *result = trunc(v * sign * 100000.0) / 100000.0;
 178 +
 179 +    return p;
 180 +}
 181 +
 182 +/* This function parses the zone.tab file to build up the mapping of
 183 + * timezone to country code and geographic location, and returns a
 184 + * hash table.  The hash table is indexed by the function:
 185 + *
 186 + *   tz_hash(timezone-name)
 187 + */
 188 +static struct location_info **create_location_table(void)
 189 +{
 190 +    struct location_info **li, *i;
 191 +    char zone_tab[PATH_MAX];
 192 +    char line[512];
 193 +    FILE *fp;
 194 +
 195 +    strncpy(zone_tab, ZONEINFO_PREFIX "/zone.tab", sizeof zone_tab);
 196 +
 197 +    fp = fopen(zone_tab, "r");
 198 +    if (!fp) {
 199 +        return NULL;
 200 +    }
 201 +
 202 +    li = calloc(LOCINFO_HASH_SIZE, sizeof *li);
 203 +
 204 +    while (fgets(line, sizeof line, fp)) {
 205 +        char *p = line, *code, *name, *comment;
 206 +        uint32_t hash;
 207 +        double latitude, longitude;
 208 +
 209 +        while (isspace(*p))
 210 +            p++;
 211 +
 212 +        if (*p == '#' || *p == '\0' || *p == '\n')
 213 +            continue;
 214 +
 215 +        if (!isalpha(p[0]) || !isalpha(p[1]) || p[2] != '\t')
 216 +            continue;
 217 +
 218 +        /* code => AA */
 219 +        code = p;
 220 +        p[2] = 0;
 221 +        p += 3;
 222 +
 223 +        /* coords => [+-][D]DDMM[SS][+-][D]DDMM[SS] */
 224 +        p = parse_iso6709(p, &latitude);
 225 +        if (!p) {
 226 +            continue;
 227 +        }
 228 +        p = parse_iso6709(p, &longitude);
 229 +        if (!p) {
 230 +            continue;
 231 +        }
 232 +
 233 +        if (!p || *p != '\t') {
 234 +            continue;
 235 +        }
 236 +
 237 +        /* name = string */
 238 +        name = ++p;
 239 +        while (*p != '\t' && *p && *p != '\n')
 240 +            p++;
 241 +
 242 +        *p++ = '\0';
 243 +
 244 +        /* comment = string */
 245 +        comment = p;
 246 +        while (*p != '\t' && *p && *p != '\n')
 247 +            p++;
 248 +
 249 +        if (*p == '\n' || *p == '\t')
 250 +            *p = '\0';
 251 +
 252 +        hash = tz_hash(name);
 253 +        i = malloc(sizeof *i);
 254 +        memcpy(i->code, code, 2);
 255 +        strncpy(i->name, name, sizeof i->name);
 256 +        i->comment = strdup(comment);
 257 +        i->longitude = longitude;
 258 +        i->latitude = latitude;
 259 +        i->next = li[hash];
 260 +        li[hash] = i;
 261 +        /* printf("%s [%u, %f, %f]\n", name, hash, latitude, longitude); */
 262 +    }
 263 +
 264 +    fclose(fp);
 265 +
 266 +    return li;
 267 +}
 268 +
 269 +/* Return location info from hash table, using given timezone name.
 270 + * Returns NULL if the name could not be found. */
 271 +const struct location_info *find_zone_info(struct location_info **li,
 272 +                                           const char *name)
 273 +{
 274 +    uint32_t hash = tz_hash(name);
 275 +    const struct location_info *l;
 276 +
 277 +    if (!li) {
 278 +        return NULL;
 279 +    }
 280 +
 281 +    for (l = li[hash]; l; l = l->next) {
 282 +        if (strcasecmp(l->name, name) == 0)
 283 +            return l;
 284 +    }
 285 +
 286 +    return NULL;
 287 +}
 288 +
 289 +/* Filter out some non-tzdata files and the posix/right databases, if
 290 + * present. */
 291 +static int index_filter(const struct dirent *ent)
 292 +{
 293 +       return strcmp(ent->d_name, ".") != 0
 294 +               && strcmp(ent->d_name, "..") != 0
 295 +               && strcmp(ent->d_name, "posix") != 0
 296 +               && strcmp(ent->d_name, "posixrules") != 0
 297 +               && strcmp(ent->d_name, "right") != 0
 298 +               && strstr(ent->d_name, ".list") == NULL
 299 +               && strstr(ent->d_name, ".tab") == NULL;
 300 +}
 301 +
 302 +static int sysdbcmp(const void *first, const void *second)
 303 +{
 304 +        const timelib_tzdb_index_entry *alpha = first, *beta = second;
 305 +
 306 +        return strcasecmp(alpha->id, beta->id);
 307 +}
 308 +
 309 +
 310 +/* Create the zone identifier index by trawling the filesystem. */
 311 +static void create_zone_index(timelib_tzdb *db)
 312 +{
 313 +       size_t dirstack_size,  dirstack_top;
 314 +       size_t index_size, index_next;
 315 +       timelib_tzdb_index_entry *db_index;
 316 +       char **dirstack;
 317 +
 318 +       /* LIFO stack to hold directory entries to scan; each slot is a
 319 +        * directory name relative to the zoneinfo prefix. */
 320 +       dirstack_size = 32;
 321 +       dirstack = malloc(dirstack_size * sizeof *dirstack);
 322 +       dirstack_top = 1;
 323 +       dirstack[0] = strdup("");
 324 +
 325 +       /* Index array. */
 326 +       index_size = 64;
 327 +       db_index = malloc(index_size * sizeof *db_index);
 328 +       index_next = 0;
 329 +
 330 +       do {
 331 +               struct dirent **ents;
 332 +               char name[PATH_MAX], *top;
 333 +               int count;
 334 +
 335 +               /* Pop the top stack entry, and iterate through its contents. */
 336 +               top = dirstack[--dirstack_top];
 337 +               snprintf(name, sizeof name, ZONEINFO_PREFIX "/%s", top);
 338 +
 339 +               count = php_scandir(name, &ents, index_filter, php_alphasort);
 340 +
 341 +               while (count > 0) {
 342 +                       struct stat st;
 343 +                       const char *leaf = ents[count - 1]->d_name;
 344 +
 345 +                       snprintf(name, sizeof name, ZONEINFO_PREFIX "/%s/%s",
 346 +                                top, leaf);
 347 +
 348 +                       if (strlen(name) && stat(name, &st) == 0) {
 349 +                               /* Name, relative to the zoneinfo prefix. */
 350 +                               const char *root = top;
 351 +
 352 +                               if (root[0] == '/') root++;
 353 +
 354 +                               snprintf(name, sizeof name, "%s%s%s", root,
 355 +                                        *root ? "/": "", leaf);
 356 +
 357 +                               if (S_ISDIR(st.st_mode)) {
 358 +                                       if (dirstack_top == dirstack_size) {
 359 +                                               dirstack_size *= 2;
 360 +                                               dirstack = realloc(dirstack,
 361 +                                                                  dirstack_size * sizeof *dirstack);
 362 +                                       }
 363 +                                       dirstack[dirstack_top++] = strdup(name);
 364 +                               }
 365 +                               else {
 366 +                                       if (index_next == index_size) {
 367 +                                               index_size *= 2;
 368 +                                               db_index = realloc(db_index,
 369 +                                                                  index_size * sizeof *db_index);
 370 +                                       }
 371 +
 372 +                                       db_index[index_next++].id = strdup(name);
 373 +                               }
 374 +                       }
 375 +
 376 +                       free(ents[--count]);
 377 +               }
 378 +
 379 +               if (count != -1) free(ents);
 380 +               free(top);
 381 +       } while (dirstack_top);
 382 +
 383 +        qsort(db_index, index_next, sizeof *db_index, sysdbcmp);
 384 +
 385 +       db->index = db_index;
 386 +       db->index_size = index_next;
 387 +
 388 +       free(dirstack);
 389 +}
 390 +
 391 +#define FAKE_HEADER "1234\0??\1??"
 392 +#define FAKE_UTC_POS (7 - 4)
 393 +
 394 +/* Create a fake data segment for database 'sysdb'. */
 395 +static void fake_data_segment(timelib_tzdb *sysdb,
 396 +                              struct location_info **info)
 397 +{
 398 +        size_t n;
 399 +        char *data, *p;
 400 +
 401 +        data = malloc(3 * sysdb->index_size + 7);
 402 +
 403 +        p = mempcpy(data, FAKE_HEADER, sizeof(FAKE_HEADER) - 1);
 404 +
 405 +        for (n = 0; n < sysdb->index_size; n++) {
 406 +                const struct location_info *li;
 407 +                timelib_tzdb_index_entry *ent;
 408 +
 409 +                ent = (timelib_tzdb_index_entry *)&sysdb->index[n];
 410 +
 411 +                /* Lookup the timezone name in the hash table. */
 412 +                if (strcmp(ent->id, "UTC") == 0) {
 413 +                        ent->pos = FAKE_UTC_POS;
 414 +                        continue;
 415 +                }
 416 +
 417 +                li = find_zone_info(info, ent->id);
 418 +                if (li) {
 419 +                        /* If found, append the BC byte and the
 420 +                         * country code; set the position for this
 421 +                         * section of timezone data.  */
 422 +                        ent->pos = (p - data) - 4;
 423 +                        *p++ = '\1';
 424 +                        *p++ = li->code[0];
 425 +                        *p++ = li->code[1];
 426 +                }
 427 +                else {
 428 +                        /* If not found, the timezone data can
 429 +                         * point at the header. */
 430 +                        ent->pos = 0;
 431 +                }
 432 +        }
 433 +
 434 +        sysdb->data = (unsigned char *)data;
 435 +}
 436 +
 437 +/* Returns true if the passed-in stat structure describes a
 438 + * probably-valid timezone file. */
 439 +static int is_valid_tzfile(const struct stat *st, int fd)
 440 +{
 441 +       if (fd) {
 442 +               char buf[20];
 443 +               if (read(fd, buf, 20)!=20) {
 444 +                       return 0;
 445 +               }
 446 +               lseek(fd, SEEK_SET, 0);
 447 +               if (memcmp(buf, "TZif", 4)) {
 448 +                       return 0;
 449 +               }
 450 +       }
 451 +       return S_ISREG(st->st_mode) && st->st_size > 20;
 452 +}
 453 +
 454 +/* To allow timezone names to be used case-insensitively, find the
 455 + * canonical name for this timezone, if possible. */
 456 +static const char *canonical_tzname(const char *timezone)
 457 +{
 458 +    if (timezonedb_system) {
 459 +        timelib_tzdb_index_entry *ent, lookup;
 460 +
 461 +        lookup.id = (char *)timezone;
 462 +
 463 +        ent = bsearch(&lookup, timezonedb_system->index,
 464 +                      timezonedb_system->index_size, sizeof lookup,
 465 +                      sysdbcmp);
 466 +        if (ent) {
 467 +            return ent->id;
 468 +        }
 469 +    }
 470 +
 471 +    return timezone;
 472 +}
 473 +
 474 +/* Return the mmap()ed tzfile if found, else NULL.  On success, the
 475 + * length of the mapped data is placed in *length. */
 476 +static char *map_tzfile(const char *timezone, size_t *length)
 477 +{
 478 +       char fname[PATH_MAX];
 479 +       struct stat st;
 480 +       char *p;
 481 +       int fd;
 482 +
 483 +       if (timezone[0] == '\0' || strstr(timezone, "..") != NULL) {
 484 +               return NULL;
 485 +       }
 486 +
 487 +       snprintf(fname, sizeof fname, ZONEINFO_PREFIX "/%s", canonical_tzname(timezone));
 488 +
 489 +       fd = open(fname, O_RDONLY);
 490 +       if (fd == -1) {
 491 +               return NULL;
 492 +       } else if (fstat(fd, &st) != 0 || !is_valid_tzfile(&st, fd)) {
 493 +               close(fd);
 494 +               return NULL;
 495 +       }
 496 +
 497 +       *length = st.st_size;
 498 +       p = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
 499 +       close(fd);
 500 +
 501 +       return p != MAP_FAILED ? p : NULL;
 502 +}
 503 +
 504 +#endif
 505 +
 506 +static int inmem_seek_to_tz_position(const unsigned char **tzf, char *timezone, const timelib_tzdb *tzdb)
 507  {
 508         int left = 0, right = tzdb->index_size - 1;
 509  #ifdef HAVE_SETLOCALE
 510 @@ -341,21 +782,88 @@ static int seek_to_tz_position(const unsigned char **tzf, char *timezone, const
 511         return 0;
 512  }
 513
 514 +static int seek_to_tz_position(const unsigned char **tzf, char *timezone,
 515 +                              char **map, size_t *maplen,
 516 +                              const timelib_tzdb *tzdb)
 517 +{
 518 +#ifdef HAVE_SYSTEM_TZDATA
 519 +       if (tzdb == timezonedb_system) {
 520 +               char *orig;
 521 +
 522 +               orig = map_tzfile(timezone, maplen);
 523 +               if (orig == NULL) {
 524 +                       return 0;
 525 +               }
 526 +
 527 +               (*tzf) = (unsigned char *)orig;
 528 +               *map = orig;
 529 +        return 1;
 530 +       }
 531 +       else
 532 +#endif
 533 +       {
 534 +               return inmem_seek_to_tz_position(tzf, timezone, tzdb);
 535 +       }
 536 +}
 537 +
 538  const timelib_tzdb *timelib_builtin_db(void)
 539  {
 540 +#ifdef HAVE_SYSTEM_TZDATA
 541 +       if (timezonedb_system == NULL) {
 542 +               timelib_tzdb *tmp = malloc(sizeof *tmp);
 543 +
 544 +               tmp->version = "0.system";
 545 +               tmp->data = NULL;
 546 +               create_zone_index(tmp);
 547 +               system_location_table = create_location_table();
 548 +               fake_data_segment(tmp, system_location_table);
 549 +               timezonedb_system = tmp;
 550 +       }
 551 +
 552 +       return timezonedb_system;
 553 +#else
 554         return &timezonedb_builtin;
 555 +#endif
 556  }
 557
 558  const timelib_tzdb_index_entry *timelib_timezone_builtin_identifiers_list(int *count)
 559  {
 560 +#ifdef HAVE_SYSTEM_TZDATA
 561 +       *count = timezonedb_system->index_size;
 562 +       return timezonedb_system->index;
 563 +#else
 564         *count = sizeof(timezonedb_idx_builtin) / sizeof(*timezonedb_idx_builtin);
 565         return timezonedb_idx_builtin;
 566 +#endif
 567  }
 568
 569  int timelib_timezone_id_is_valid(char *timezone, const timelib_tzdb *tzdb)
 570  {
 571         const unsigned char *tzf;
 572 -       return (seek_to_tz_position(&tzf, timezone, tzdb));
 573 +
 574 +#ifdef HAVE_SYSTEM_TZDATA
 575 +       if (tzdb == timezonedb_system) {
 576 +               char fname[PATH_MAX];
 577 +               struct stat st;
 578 +
 579 +               if (timezone[0] == '\0' || strstr(timezone, "..") != NULL) {
 580 +                       return 0;
 581 +               }
 582 +
 583 +               if (system_location_table) {
 584 +                       if (find_zone_info(system_location_table, timezone) != NULL) {
 585 +                               /* found in cache */
 586 +                               return 1;
 587 +                       }
 588 +               }
 589 +
 590 +               snprintf(fname, sizeof fname, ZONEINFO_PREFIX "/%s", canonical_tzname(timezone));
 591 +
 592 +               return stat(fname, &st) == 0 && is_valid_tzfile(&st, 0);
 593 +       }
 594 +#endif
 595 +
 596 +       return (inmem_seek_to_tz_position(&tzf, timezone, tzdb));
 597  }
 598
 599  static void skip_64bit_preamble(const unsigned char **tzf, timelib_tzinfo *tz)
 600 @@ -380,24 +888,54 @@ static void read_64bit_header(const unsigned char **tzf, timelib_tzinfo *tz)
 601  timelib_tzinfo *timelib_parse_tzfile(char *timezone, const timelib_tzdb *tzdb)
 602  {
 603         const unsigned char *tzf;
 604 +       char *memmap = NULL;
 605 +       size_t maplen;
 606         timelib_tzinfo *tmp;
 607         int version;
 608
 609 -       if (seek_to_tz_position(&tzf, timezone, tzdb)) {
 610 +       if (seek_to_tz_position(&tzf, timezone, &memmap, &maplen, tzdb)) {
 611                 tmp = timelib_tzinfo_ctor(timezone);
 612
 613                 version = read_preamble(&tzf, tmp);
 614                 read_header(&tzf, tmp);
 615                 read_transistions(&tzf, tmp);
 616                 read_types(&tzf, tmp);
 617 -               if (version == 2) {
 618 -                       skip_64bit_preamble(&tzf, tmp);
 619 -                       read_64bit_header(&tzf, tmp);
 620 -                       skip_64bit_transistions(&tzf, tmp);
 621 -                       skip_64bit_types(&tzf, tmp);
 622 -                       skip_posix_string(&tzf, tmp);
 623 -               }
 624 -               read_location(&tzf, tmp);
 625 +
 626 +#ifdef HAVE_SYSTEM_TZDATA
 627 +               if (memmap) {
 628 +                       const struct location_info *li;
 629 +
 630 +                       /* TZif-style - grok the location info from the system database,
 631 +                        * if possible. */
 632 +
 633 +                       if ((li = find_zone_info(system_location_table, timezone)) != NULL) {
 634 +                               tmp->location.comments = timelib_strdup(li->comment);
 635 +                               strncpy(tmp->location.country_code, li->code, 2);
 636 +                               tmp->location.longitude = li->longitude;
 637 +                               tmp->location.latitude = li->latitude;
 638 +                               tmp->bc = 1;
 639 +                       }
 640 +                       else {
 641 +                               strcpy(tmp->location.country_code, "??");
 642 +                               tmp->bc = 0;
 643 +                               tmp->location.comments = timelib_strdup("");
 644 +                       }
 645 +
 646 +                       /* Now done with the mmap segment - discard it. */
 647 +                       munmap(memmap, maplen);
 648 +               } else
 649 +#endif
 650 +               {
 651 +                       /* PHP-style - use the embedded info. */
 652 +                       if (version == 2) {
 653 +                               skip_64bit_preamble(&tzf, tmp);
 654 +                               read_64bit_header(&tzf, tmp);
 655 +                               skip_64bit_transistions(&tzf, tmp);
 656 +                               skip_64bit_types(&tzf, tmp);
 657 +                               skip_posix_string(&tzf, tmp);
 658 +                       }
 659 +                       read_location(&tzf, tmp);
 660 +               }
 661         } else {
 662                 tmp = NULL;
 663         }
 664 diff --git a/ext/date/lib/timelib.m4 b/ext/date/lib/timelib.m4
 665 index 99bf9fa..4bf7e46 100644
 666 --- a/ext/date/lib/timelib.m4
 667 +++ b/ext/date/lib/timelib.m4
 668 @@ -78,3 +78,16 @@ stdlib.h
 669
 670  dnl Check for strtoll, atoll
 671  AC_CHECK_FUNCS(strtoll atoll strftime gettimeofday)
 672 +
 673 +PHP_ARG_WITH(system-tzdata, for use of system timezone data,
 674 +[  --with-system-tzdata[=DIR]      to specify use of system timezone data],
 675 +no, no)
 676 +
 677 +if test "$PHP_SYSTEM_TZDATA" != "no"; then
 678 +   AC_DEFINE(HAVE_SYSTEM_TZDATA, 1, [Define if system timezone data is used])
 679 +
 680 +   if test "$PHP_SYSTEM_TZDATA" != "yes"; then
 681 +      AC_DEFINE_UNQUOTED(HAVE_SYSTEM_TZDATA_PREFIX, "$PHP_SYSTEM_TZDATA",
 682 +                         [Define for location of system timezone data])
 683 +   fi
 684 +fi