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authorDan Winship <danw@src.gnome.org>2002-09-05 03:13:14 +0800
committerDan Winship <danw@src.gnome.org>2002-09-05 03:13:14 +0800
commit4270c51a98b6cc77a8337c6120195be4f620c775 (patch)
tree25a6812737374a104df1ed6802c487402fe6d8a1 /e-util
parentb05255308c5033e6c719416253428b6e6856c3e6 (diff)
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New. Like mktime(3), but assumes the input time is UTC.
* e-time-utils.c (e_mktime_utc): New. Like mktime(3), but assumes the input time is UTC. (e_localtime_with_offset): New. Like localtime_r(3), but also returns an offset from UTC. svn path=/trunk/; revision=17971
Diffstat (limited to 'e-util')
-rw-r--r--e-util/ChangeLog7
-rw-r--r--e-util/e-time-utils.c61
-rw-r--r--e-util/e-time-utils.h5
3 files changed, 68 insertions, 5 deletions
diff --git a/e-util/ChangeLog b/e-util/ChangeLog
index 47b9bf138e..c58ab2ef73 100644
--- a/e-util/ChangeLog
+++ b/e-util/ChangeLog
@@ -1,3 +1,10 @@
+2002-09-04 Dan Winship <danw@ximian.com>
+
+ * e-time-utils.c (e_mktime_utc): New. Like mktime(3), but assumes
+ the input time is UTC.
+ (e_localtime_with_offset): New. Like localtime_r(3), but also
+ returns an offset from UTC.
+
2002-08-29 Dan Winship <danw@ximian.com>
* e-list.c (e_list_destroy): Don't call g_list_foreach with the
diff --git a/e-util/e-time-utils.c b/e-util/e-time-utils.c
index f91695f977..ecc3fc9602 100644
--- a/e-util/e-time-utils.c
+++ b/e-util/e-time-utils.c
@@ -10,13 +10,17 @@
#include <config.h>
-/* We need this for strptime. */
-#define _XOPEN_SOURCE 500
-#define __USE_XOPEN
+#ifdef __linux__
+/* We need this to get a prototype for strptime. */
+#define _GNU_SOURCE
+#endif /* __linux__ */
+
#include <time.h>
#include <sys/time.h>
-#undef _XOPEN_SOURCE
-#undef __USE_XOPEN
+
+#ifdef __linux__
+#undef _GNU_SOURCE
+#endif /* __linux__ */
#include <string.h>
#include <ctype.h>
@@ -426,3 +430,50 @@ e_time_format_time (struct tm *date_tm,
if (strftime (buffer, buffer_size, format, date_tm) == 0)
buffer[0] = '\0';
}
+
+
+/* Like mktime(3), but assumes UTC instead of local timezone. */
+time_t
+e_mktime_utc (struct tm *tm)
+{
+ time_t tt;
+
+ tm->tm_isdst = -1;
+ tt = mktime (tm);
+
+#if defined (HAVE_TM_GMTOFF)
+ tt += tm->tm_gmtoff;
+#elif defined (HAVE_TIMEZONE)
+ if (tm->tm_isdst > 0) {
+ #if defined (HAVE_ALTZONE)
+ tt -= altzone;
+ #else /* !defined (HAVE_ALTZONE) */
+ tt -= (timezone - 3600);
+ #endif
+ } else
+ tt -= timezone;
+#endif
+
+ return tt;
+}
+
+/* Like localtime_r(3), but also returns an offset in minutes after UTC.
+ (Calling gmtime with tt + offset would generate the same tm) */
+void
+e_localtime_with_offset (time_t tt, struct tm *tm, int *offset)
+{
+ localtime_r (&tt, tm);
+
+#if defined (HAVE_TM_GMTOFF)
+ *offset = tm->tm_gmtoff;
+#elif defined (HAVE_TIMEZONE)
+ if (tm->tm_isdst > 0) {
+ #if defined (HAVE_ALTZONE)
+ *offset = -altzone;
+ #else /* !defined (HAVE_ALTZONE) */
+ *offset = -(timezone - 3600);
+ #endif
+ } else
+ *offset = -timezone;
+#endif
+}
diff --git a/e-util/e-time-utils.h b/e-util/e-time-utils.h
index f6d85df5ac..0b081dadd4 100644
--- a/e-util/e-time-utils.h
+++ b/e-util/e-time-utils.h
@@ -48,6 +48,11 @@ void e_time_format_time (struct tm *date_tm,
int buffer_size);
+/* Like mktime(3), but assumes UTC instead of local timezone. */
+time_t e_mktime_utc (struct tm *timeptr);
+/* Like localtime_r(3), but also returns an offset in minutes after UTC.
+ (Calling gmtime with tt + offset would generate the same tm) */
+void e_localtime_with_offset (time_t tt, struct tm *tm, int *offset);
#endif /* E_TIME_UTILS */