diff options
Diffstat (limited to 'time/tzfile.c')
| -rw-r--r-- | time/tzfile.c | 63 |
1 files changed, 57 insertions, 6 deletions
diff --git a/time/tzfile.c b/time/tzfile.c index 6a8bf89f9e..d19b7e9b4f 100644 --- a/time/tzfile.c +++ b/time/tzfile.c @@ -371,15 +371,53 @@ __tzfile_read (const char *file, size_t extra, char **extrap) types[i++].isgmt = 0; /* Read the POSIX TZ-style information if possible. */ - if (tzspec != NULL) + if (sizeof (time_t) == 8 && tzspec != NULL) { /* Skip over the newline first. */ if (getc_unlocked (f) != '\n' - || fread_unlocked (tzspec, 1, tzspec_len - 1, f) != tzspec_len - 1) + || (fread_unlocked (tzspec, 1, tzspec_len - 1, f) + != tzspec_len - 1)) tzspec = NULL; else tzspec[tzspec_len - 1] = '\0'; } + else if (sizeof (time_t) == 4 && tzhead.tzh_version != '\0') + { + /* Get the TZ string. */ + if (__builtin_expect (fread_unlocked ((void *) &tzhead, sizeof (tzhead), + 1, f) != 1, 0) + || (memcmp (tzhead.tzh_magic, TZ_MAGIC, sizeof (tzhead.tzh_magic)) + != 0)) + goto lose; + + size_t num_transitions2 = (size_t) decode (tzhead.tzh_timecnt); + size_t num_types2 = (size_t) decode (tzhead.tzh_typecnt); + size_t chars2 = (size_t) decode (tzhead.tzh_charcnt); + size_t num_leaps2 = (size_t) decode (tzhead.tzh_leapcnt); + size_t num_isstd2 = (size_t) decode (tzhead.tzh_ttisstdcnt); + size_t num_isgmt2 = (size_t) decode (tzhead.tzh_ttisgmtcnt); + + /* Position the stream before the second header. */ + size_t to_skip = (num_transitions2 * (8 + 1) + + num_types2 * 6 + + chars2 + + num_leaps2 * 12 + + num_isstd2 + + num_isgmt2); + off_t off; + if (fseek (f, to_skip, SEEK_CUR) != 0 + || (off = ftello (f)) < 0 + || st.st_size < off + 2) + goto lose; + + tzspec_len = st.st_size - off - 1; + char *tzstr = alloca (tzspec_len); + if (getc_unlocked (f) != '\n' + || (fread_unlocked (tzstr, 1, tzspec_len - 1, f) != tzspec_len - 1)) + goto lose; + tzstr[tzspec_len - 1] = '\0'; + tzspec = __tzstring (tzstr); + } fclose (f); @@ -561,7 +599,7 @@ __tzfile_compute (time_t timer, int use_localtime, __tzname[0] = NULL; __tzname[1] = NULL; - if (num_transitions == 0 || timer < transitions[0]) + if (__builtin_expect (num_transitions == 0 || timer < transitions[0], 0)) { /* TIMER is before any transition (or there are no transitions). Choose the first non-DST type @@ -591,9 +629,9 @@ __tzfile_compute (time_t timer, int use_localtime, ++j; } } - else if (timer >= transitions[num_transitions - 1]) + else if (__builtin_expect (timer >= transitions[num_transitions - 1], 0)) { - if (tzspec == NULL) + if (__builtin_expect (tzspec == NULL, 0)) { use_last: i = num_transitions; @@ -605,12 +643,22 @@ __tzfile_compute (time_t timer, int use_localtime, /* Convert to broken down structure. If this fails do not use the string. */ - if (! __offtime (&timer, 0, tp)) + if (__builtin_expect (! __offtime (&timer, 0, tp), 0)) goto use_last; /* Use the rules from the TZ string to compute the change. */ __tz_compute (timer, tp, 1); + /* If tzspec comes from posixrules loaded by __tzfile_default, + override the STD and DST zone names with the ones user + requested in TZ envvar. */ + if (__builtin_expect (zone_names == (char *) &leaps[num_leaps], 0)) + { + assert (num_types == 2); + __tzname[0] = __tzstring (zone_names); + __tzname[1] = __tzstring (&zone_names[strlen (zone_names) + 1]); + } + *leap_correct = 0L; *leap_hit = 0; return; @@ -688,6 +736,9 @@ __tzfile_compute (time_t timer, int use_localtime, ++j; } + if (__builtin_expect (__tzname[0] == NULL, 0)) + __tzname[0] = __tzname[1]; + i = type_idxs[i - 1]; } |