Clean up C library functions. Add fallback to gettimeofday() if clock_gettime() fails.

src/libiso8601/400_c_library.c

@@ -1,4 +1,4 @@
-/* libiso8601/src/libiso8601/c_library.c
+/* libiso8601/src/libiso8601/400_c_library.c
  *
  *  (c)2006, Laurence Withers, <l@lwithers.me.uk>.
  *  Released under the GNU GPLv2. See file COPYING or
@@ -12,23 +12,31 @@
 
 void iso8601_now(struct iso8601_date* date, struct iso8601_details* details)
 {
+    static int use_gettimeofday = 0;
     struct timespec ts;
+    struct timeval tv;
     struct tm tm;
 
-    clock_gettime(CLOCK_REALTIME, &ts);
+    /* not all systems have clock_gettime implemented */
+    if(use_gettimeofday || clock_gettime(CLOCK_REALTIME, &ts)) {
+        use_gettimeofday = 1;
+        gettimeofday(&tv, 0);
+        ts.tv_sec = tv.tv_sec;
+        ts.tv_nsec = tv.tv_usec * 1000L;
+    }
 
-    // populate the `struct iso8601_date' if it was passed
+    /* populate the `struct iso8601_date' if it was passed */
     if(date) {
         iso8601_from_ts(date, &ts);
     }
 
-    // populate the `struct iso8601_details' if it was passed
+    /* populate the `struct iso8601_details' if it was passed */
     if(details) {
         memset(details, 0, sizeof(struct iso8601_details));
         details->date_prec = iso8601_prec_day;
         details->time_prec = iso8601_prec_secfrac;
 
-        // this is silly, but it's the only way to recover the timezone
+        /* this is silly, but it's the only way to recover the timezone */
         localtime_r(&ts.tv_sec, &tm);
         details->tz_sec = tm.tm_gmtoff;
     }

src/libiso8601/400_c_library.h

@@ -0,0 +1,47 @@
+/* libiso8601/src/libiso8601/400_c_library.h
+ *
+ *  (c)2006, Laurence Withers, <l@lwithers.me.uk>.
+ *  Released under the GNU GPLv2. See file COPYING or
+ *  http://www.gnu.org/copyleft/gpl.html for details.
+*/
+
+
+
+/*! \defgroup c_library C library integration.
+
+These functions enable integration with the C library (system call wrappers and conversion).
+
+*/
+/*!@{*/
+
+
+
+/*! \brief Retrieve the current time.
+
+\param[out] date Current date/time (may be 0), in UTC.
+\param[out] details Details (may be 0), including timezone.
+
+Retrieves the current time from the system clock, storing it into \a date and \a details (both
+parameters optional).
+
+*/
+void iso8601_now(struct iso8601_date* date, struct iso8601_details* details);
+
+
+
+/*! \brief Convert from a struct timespec. */
+void iso8601_from_ts(struct iso8601_date* date, const struct timespec* ts);
+/*! \brief Convert to a struct timespec. */
+void iso8601_to_ts(struct timespec* ts, const struct iso8601_date* date);
+/*! \brief Convert from a time_t. */
+void iso8601_from_time_t(struct iso8601_date* date, const time_t* t);
+/*! \brief Convert to a time_t. */
+void iso8601_to_time_t(time_t* t, const struct iso8601_date* date);
+
+
+
+/*!@}*/
+/* options for text editors
+kate: replace-trailing-space-save true; space-indent true; tab-width 4;
+vim: expandtab:ts=4:sw=4
+*/