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Diffstat (limited to 'src/time')
-rw-r--r--src/time/__tz.c20
-rw-r--r--src/time/gmtime_r.c4
-rw-r--r--src/time/strftime.c16
-rw-r--r--src/time/timegm.c4
4 files changed, 36 insertions, 8 deletions
diff --git a/src/time/__tz.c b/src/time/__tz.c
index 36b59802..dfeac519 100644
--- a/src/time/__tz.c
+++ b/src/time/__tz.c
@@ -15,11 +15,12 @@ weak_alias(__tzname, tzname);
static char std_name[TZNAME_MAX+1];
static char dst_name[TZNAME_MAX+1];
+const char __gmt[] = "GMT";
static int dst_off;
static int r0[5], r1[5];
-static const unsigned char *zi, *trans, *index, *types, *abbrevs;
+static const unsigned char *zi, *trans, *index, *types, *abbrevs, *abbrevs_end;
static size_t map_size;
static char old_tz_buf[32];
@@ -127,7 +128,7 @@ static void do_tzset()
"/usr/share/zoneinfo/\0/share/zoneinfo/\0/etc/zoneinfo/\0";
s = getenv("TZ");
- if (!s || !*s) s = "GMT0";
+ if (!s || !*s) s = __gmt;
if (old_tz && !strcmp(s, old_tz)) return;
@@ -184,6 +185,7 @@ static void do_tzset()
index = trans + (zi_read32(trans-12) << scale);
types = index + zi_read32(trans-12);
abbrevs = types + 6*zi_read32(trans-8);
+ abbrevs_end = abbrevs + zi_read32(trans-4);
if (zi[map_size-1] == '\n') {
for (s = (const char *)zi+map_size-2; *s!='\n'; s--);
s++;
@@ -192,7 +194,7 @@ static void do_tzset()
}
}
- if (!s) s = "GMT0";
+ if (!s) s = __gmt;
getname(std_name, &s);
__tzname[0] = std_name;
__timezone = getoff(&s);
@@ -387,3 +389,15 @@ void __tzset()
}
weak_alias(__tzset, tzset);
+
+const char *__tm_to_tzname(const struct tm *tm)
+{
+ const void *p = tm->__tm_zone;
+ LOCK(lock);
+ do_tzset();
+ if (p != __gmt && p != __tzname[0] && p != __tzname[1]
+ && (uintptr_t)p-(uintptr_t)abbrevs >= abbrevs_end - abbrevs)
+ p = "";
+ UNLOCK(lock);
+ return p;
+}
diff --git a/src/time/gmtime_r.c b/src/time/gmtime_r.c
index fee01bd6..8cbdadcb 100644
--- a/src/time/gmtime_r.c
+++ b/src/time/gmtime_r.c
@@ -2,6 +2,8 @@
#include <errno.h>
#include "libc.h"
+extern const char __gmt[];
+
struct tm *__gmtime_r(const time_t *restrict t, struct tm *restrict tm)
{
if (__secs_to_tm(*t, tm) < 0) {
@@ -10,7 +12,7 @@ struct tm *__gmtime_r(const time_t *restrict t, struct tm *restrict tm)
}
tm->tm_isdst = 0;
tm->__tm_gmtoff = 0;
- tm->__tm_zone = "GMT";
+ tm->__tm_zone = __gmt;
return tm;
}
diff --git a/src/time/strftime.c b/src/time/strftime.c
index 24000f3b..48f65320 100644
--- a/src/time/strftime.c
+++ b/src/time/strftime.c
@@ -43,6 +43,7 @@ static int week_num(const struct tm *tm)
return val;
}
+const char *__tm_to_tzname(const struct tm *);
size_t __strftime_l(char *restrict, size_t, const char *restrict, const struct tm *restrict, locale_t);
const char *__strftime_fmt_1(char (*s)[100], size_t *l, int f, const struct tm *tm, locale_t loc)
@@ -166,11 +167,20 @@ const char *__strftime_fmt_1(char (*s)[100], size_t *l, int f, const struct tm *
width = 4;
goto number;
case 'z':
- val = -tm->__tm_gmtoff;
- *l = snprintf(*s, sizeof *s, "%+.2d%.2d", val/3600, abs(val%3600)/60);
+ if (tm->tm_isdst < 0) {
+ *l = 0;
+ return "";
+ }
+ *l = snprintf(*s, sizeof *s, "%+.2d%.2d",
+ (-tm->__tm_gmtoff)/3600,
+ abs(tm->__tm_gmtoff%3600)/60);
return *s;
case 'Z':
- fmt = tm->__tm_zone;
+ if (tm->tm_isdst < 0) {
+ *l = 0;
+ return "";
+ }
+ fmt = __tm_to_tzname(tm);
goto string;
case '%':
*l = 1;
diff --git a/src/time/timegm.c b/src/time/timegm.c
index e7a7939b..b5dae8b6 100644
--- a/src/time/timegm.c
+++ b/src/time/timegm.c
@@ -2,6 +2,8 @@
#include "time_impl.h"
#include <errno.h>
+extern const char __gmt[];
+
time_t timegm(struct tm *tm)
{
struct tm new;
@@ -13,6 +15,6 @@ time_t timegm(struct tm *tm)
*tm = new;
tm->tm_isdst = 0;
tm->__tm_gmtoff = 0;
- tm->__tm_zone = "GMT";
+ tm->__tm_zone = __gmt;
return t;
}