extern Lisp_Object w32_get_internal_run_time (void);
#endif
-static void time_overflow (void) NO_RETURN;
-static Lisp_Object format_time_string (char const *, ptrdiff_t, Lisp_Object,
- int, time_t *, struct tm *);
+static Lisp_Object format_time_string (char const *, ptrdiff_t, EMACS_TIME,
+ int, struct tm *);
static int tm_diff (struct tm *, struct tm *);
static void update_buffer_properties (ptrdiff_t, ptrdiff_t);
#endif
/* Report that a time value is out of range for Emacs. */
-static void
+void
time_overflow (void)
{
error ("Specified time is not representable");
}
-/* Return the upper part of the time T (everything but the bottom 16 bits),
- making sure that it is representable. */
+/* Return the upper part of the time T (everything but the bottom 16 bits). */
static EMACS_INT
hi_time (time_t t)
{
DEFUN ("current-time", Fcurrent_time, Scurrent_time, 0, 0, 0,
doc: /* Return the current time, as the number of seconds since 1970-01-01 00:00:00.
-The time is returned as a list of three integers. The first has the
-most significant 16 bits of the seconds, while the second has the
-least significant 16 bits. The third integer gives the microsecond
-count.
-
-The microsecond count is zero on systems that do not provide
-resolution finer than a second. */)
+The time is returned as a list of integers (HIGH LOW USEC PSEC).
+HIGH has the most significant bits of the seconds, while LOW has the
+least significant 16 bits. USEC and PSEC are the microsecond and
+picosecond counts. */)
(void)
{
EMACS_TIME t;
EMACS_GET_TIME (t);
- return list3 (make_number (hi_time (EMACS_SECS (t))),
- make_number (lo_time (EMACS_SECS (t))),
- make_number (EMACS_USECS (t)));
+ return make_lisp_time (t);
}
DEFUN ("get-internal-run-time", Fget_internal_run_time, Sget_internal_run_time,
0, 0, 0,
doc: /* Return the current run time used by Emacs.
-The time is returned as a list of three integers. The first has the
-most significant 16 bits of the seconds, while the second has the
-least significant 16 bits. The third integer gives the microsecond
-count.
+The time is returned as a list (HIGH LOW USEC PSEC), using the same
+style as (current-time).
On systems that can't determine the run time, `get-internal-run-time'
-does the same thing as `current-time'. The microsecond count is zero
-on systems that do not provide resolution finer than a second. */)
+does the same thing as `current-time'. */)
(void)
{
#ifdef HAVE_GETRUSAGE
struct rusage usage;
time_t secs;
int usecs;
+ EMACS_TIME t;
if (getrusage (RUSAGE_SELF, &usage) < 0)
/* This shouldn't happen. What action is appropriate? */
usecs -= 1000000;
secs++;
}
-
- return list3 (make_number (hi_time (secs)),
- make_number (lo_time (secs)),
- make_number (usecs));
+ EMACS_SET_SECS_USECS (t, secs, usecs);
+ return make_lisp_time (t);
#else /* ! HAVE_GETRUSAGE */
#ifdef WINDOWSNT
return w32_get_internal_run_time ();
}
\f
-/* Make a Lisp list that represents the time T. */
-Lisp_Object
+/* Make a Lisp list that represents the time T with fraction TAIL. */
+static Lisp_Object
+make_time_tail (time_t t, Lisp_Object tail)
+{
+ return Fcons (make_number (hi_time (t)),
+ Fcons (make_number (lo_time (t)), tail));
+}
+
+/* Make a Lisp list that represents the system time T. */
+static Lisp_Object
make_time (time_t t)
{
- return list2 (make_number (hi_time (t)),
- make_number (lo_time (t)));
+ return make_time_tail (t, Qnil);
+}
+
+/* Make a Lisp list that represents the Emacs time T. T may be an
+ invalid time, with a slightly negative tv_nsec value such as
+ UNKNOWN_MODTIME_NSECS; in that case, the Lisp list contains a
+ correspondingly negative picosecond count. */
+Lisp_Object
+make_lisp_time (EMACS_TIME t)
+{
+ int ns = EMACS_NSECS (t);
+ return make_time_tail (EMACS_SECS (t),
+ list2 (make_number (ns / 1000),
+ make_number (ns % 1000 * 1000)));
}
/* Decode a Lisp list SPECIFIED_TIME that represents a time.
- If SPECIFIED_TIME is nil, use the current time.
- Set *RESULT to seconds since the Epoch.
- If USEC is not null, set *USEC to the microseconds component.
+ Set *PHIGH, *PLOW, *PUSEC, *PPSEC to its parts; do not check their values.
Return nonzero if successful. */
+static int
+disassemble_lisp_time (Lisp_Object specified_time, Lisp_Object *phigh,
+ Lisp_Object *plow, Lisp_Object *pusec,
+ Lisp_Object *ppsec)
+{
+ if (CONSP (specified_time))
+ {
+ Lisp_Object low = XCDR (specified_time);
+ Lisp_Object usec = make_number (0);
+ Lisp_Object psec = make_number (0);
+ if (CONSP (low))
+ {
+ Lisp_Object low_tail = XCDR (low);
+ low = XCAR (low);
+ if (CONSP (low_tail))
+ {
+ usec = XCAR (low_tail);
+ low_tail = XCDR (low_tail);
+ if (CONSP (low_tail))
+ psec = XCAR (low_tail);
+ }
+ else if (!NILP (low_tail))
+ usec = low_tail;
+ }
+
+ *phigh = XCAR (specified_time);
+ *plow = low;
+ *pusec = usec;
+ *ppsec = psec;
+ return 1;
+ }
+
+ return 0;
+}
+
+/* From the time components HIGH, LOW, USEC and PSEC taken from a Lisp
+ list, generate the corresponding EMACS_TIME value *RESULT, and
+ if RESULT_PSEC is not null store into *RESULT_PSEC the
+ (nonnegative) difference in picoseconds between the input time and
+ the returned time. Return nonzero if successful. */
int
-lisp_time_argument (Lisp_Object specified_time, time_t *result, int *usec)
+decode_time_components (Lisp_Object high, Lisp_Object low, Lisp_Object usec,
+ Lisp_Object psec, EMACS_TIME *result, int *result_psec)
{
+ EMACS_INT hi, lo, us, ps;
+ time_t sec;
+ if (! (INTEGERP (high) && INTEGERP (low)
+ && INTEGERP (usec) && INTEGERP (psec)))
+ return 0;
+ hi = XINT (high);
+ lo = XINT (low);
+ us = XINT (usec);
+ ps = XINT (psec);
+
+ /* Normalize out-of-range lower-order components by carrying
+ each overflow into the next higher-order component. */
+ us += ps / 1000000 - (ps % 1000000 < 0);
+ lo += us / 1000000 - (us % 1000000 < 0);
+ hi += lo >> 16;
+ ps = ps % 1000000 + 1000000 * (ps % 1000000 < 0);
+ us = us % 1000000 + 1000000 * (us % 1000000 < 0);
+ lo &= (1 << 16) - 1;
+
+ /* Check for overflow in the highest-order component. */
+ if (! ((TYPE_SIGNED (time_t) ? TIME_T_MIN >> 16 <= hi : 0 <= hi)
+ && hi <= TIME_T_MAX >> 16))
+ return 0;
+
+ sec = hi;
+ EMACS_SET_SECS_NSECS (*result, (sec << 16) + lo, us * 1000 + ps / 1000);
+ if (result_psec)
+ *result_psec = ps % 1000;
+ return 1;
+}
+
+/* Decode a Lisp list SPECIFIED_TIME that represents a time.
+ If SPECIFIED_TIME is nil, use the current time.
+ Round the time down to the nearest EMACS_TIME value, and
+ if PPSEC is not null store into *PPSEC the (nonnegative) difference in
+ picoseconds between the input time and the returned time.
+ Return seconds since the Epoch.
+ Signal an error if unsuccessful. */
+EMACS_TIME
+lisp_time_argument (Lisp_Object specified_time, int *ppsec)
+{
+ EMACS_TIME t;
if (NILP (specified_time))
+ EMACS_GET_TIME (t);
+ else
{
- if (usec)
- {
- EMACS_TIME t;
-
- EMACS_GET_TIME (t);
- *usec = EMACS_USECS (t);
- *result = EMACS_SECS (t);
- return 1;
- }
- else
- return time (result) != -1;
+ Lisp_Object high, low, usec, psec;
+ if (! (disassemble_lisp_time (specified_time, &high, &low, &usec, &psec)
+ && decode_time_components (high, low, usec, psec, &t, ppsec)))
+ error ("Invalid time specification");
}
+ return t;
+}
+
+/* Like lisp_time_argument, except decode only the seconds part,
+ and do not check the subseconds part, and always round down. */
+static time_t
+lisp_seconds_argument (Lisp_Object specified_time)
+{
+ if (NILP (specified_time))
+ return time (NULL);
else
{
- Lisp_Object high, low;
- EMACS_INT hi;
- high = Fcar (specified_time);
- CHECK_NUMBER (high);
- low = Fcdr (specified_time);
- if (CONSP (low))
- {
- if (usec)
- {
- Lisp_Object usec_l = Fcdr (low);
- if (CONSP (usec_l))
- usec_l = Fcar (usec_l);
- if (NILP (usec_l))
- *usec = 0;
- else
- {
- CHECK_NUMBER (usec_l);
- if (! (0 <= XINT (usec_l) && XINT (usec_l) < 1000000))
- return 0;
- *usec = XINT (usec_l);
- }
- }
- low = Fcar (low);
- }
- else if (usec)
- *usec = 0;
- CHECK_NUMBER (low);
- hi = XINT (high);
-
- /* Check for overflow, helping the compiler for common cases
- where no runtime check is needed, and taking care not to
- convert negative numbers to unsigned before comparing them. */
- if (! ((TYPE_SIGNED (time_t)
- ? (TIME_T_MIN >> 16 <= MOST_NEGATIVE_FIXNUM
- || TIME_T_MIN >> 16 <= hi)
- : 0 <= hi)
- && (MOST_POSITIVE_FIXNUM <= TIME_T_MAX >> 16
- || hi <= TIME_T_MAX >> 16)))
- return 0;
-
- *result = (hi << 16) + (XINT (low) & 0xffff);
- return 1;
+ Lisp_Object high, low, usec, psec;
+ EMACS_TIME t;
+ if (! (disassemble_lisp_time (specified_time, &high, &low, &usec, &psec)
+ && decode_time_components (high, low, make_number (0),
+ make_number (0), &t, 0)))
+ error ("Invalid time specification");
+ return EMACS_SECS (t);
}
}
doc: /* Return the current time, as a float number of seconds since the epoch.
If SPECIFIED-TIME is given, it is the time to convert to float
instead of the current time. The argument should have the form
-(HIGH LOW) or (HIGH LOW USEC). Thus, you can use times obtained from
-`current-time' and from `file-attributes'. SPECIFIED-TIME can also
-have the form (HIGH . LOW), but this is considered obsolete.
+(HIGH LOW) or (HIGH LOW USEC) or (HIGH LOW USEC PSEC). Thus,
+you can use times from `current-time' and from `file-attributes'.
+SPECIFIED-TIME can also have the form (HIGH . LOW), but this is
+considered obsolete.
WARNING: Since the result is floating point, it may not be exact.
If precise time stamps are required, use either `current-time',
or (if you need time as a string) `format-time-string'. */)
(Lisp_Object specified_time)
{
- time_t sec;
- int usec;
-
- if (! lisp_time_argument (specified_time, &sec, &usec))
- error ("Invalid time specification");
-
- return make_float ((sec * 1e6 + usec) / 1e6);
+ int psec;
+ EMACS_TIME t = lisp_time_argument (specified_time, &psec);
+ double ps = (1000 * 1000 * 1000 <= INTMAX_MAX / 1000
+ ? EMACS_NSECS (t) * (intmax_t) 1000 + psec
+ : EMACS_NSECS (t) * 1e3 + psec);
+ return make_float (EMACS_SECS (t) + ps / 1e12);
}
/* Write information into buffer S of size MAXSIZE, according to the
DEFUN ("format-time-string", Fformat_time_string, Sformat_time_string, 1, 3, 0,
doc: /* Use FORMAT-STRING to format the time TIME, or now if omitted.
-TIME is specified as (HIGH LOW . IGNORED), as returned by
+TIME is specified as (HIGH LOW USEC PSEC), as returned by
`current-time' or `file-attributes'. The obsolete form (HIGH . LOW)
is also still accepted.
The third, optional, argument UNIVERSAL, if non-nil, means describe TIME
usage: (format-time-string FORMAT-STRING &optional TIME UNIVERSAL) */)
(Lisp_Object format_string, Lisp_Object timeval, Lisp_Object universal)
{
- time_t t;
+ EMACS_TIME t = lisp_time_argument (timeval, 0);
struct tm tm;
CHECK_STRING (format_string);
format_string = code_convert_string_norecord (format_string,
Vlocale_coding_system, 1);
return format_time_string (SSDATA (format_string), SBYTES (format_string),
- timeval, ! NILP (universal), &t, &tm);
+ t, ! NILP (universal), &tm);
}
static Lisp_Object
format_time_string (char const *format, ptrdiff_t formatlen,
- Lisp_Object timeval, int ut, time_t *tval, struct tm *tmp)
+ EMACS_TIME t, int ut, struct tm *tmp)
{
char buffer[4000];
char *buf = buffer;
ptrdiff_t size = sizeof buffer;
size_t len;
Lisp_Object bufstring;
- int usec;
- int ns;
+ int ns = EMACS_NSECS (t);
struct tm *tm;
USE_SAFE_ALLOCA;
- if (! lisp_time_argument (timeval, tval, &usec))
- error ("Invalid time specification");
- ns = usec * 1000;
-
while (1)
{
BLOCK_INPUT;
synchronize_system_time_locale ();
- tm = ut ? gmtime (tval) : localtime (tval);
+ tm = ut ? gmtime (EMACS_SECS_ADDR (t)) : localtime (EMACS_SECS_ADDR (t));
if (! tm)
{
UNBLOCK_INPUT;
DOW and ZONE.) */)
(Lisp_Object specified_time)
{
- time_t time_spec;
+ time_t time_spec = lisp_seconds_argument (specified_time);
struct tm save_tm;
struct tm *decoded_time;
Lisp_Object list_args[9];
- if (! lisp_time_argument (specified_time, &time_spec, NULL))
- error ("Invalid time specification");
-
BLOCK_INPUT;
decoded_time = localtime (&time_spec);
- /* Make a copy, in case a signal handler modifies TZ or the struct. */
if (decoded_time)
save_tm = *decoded_time;
UNBLOCK_INPUT;
but this is considered obsolete. */)
(Lisp_Object specified_time)
{
- time_t value;
+ time_t value = lisp_seconds_argument (specified_time);
struct tm *tm;
char buf[sizeof "Mon Apr 30 12:49:17 " + INT_STRLEN_BOUND (int) + 1];
int len IF_LINT (= 0);
- if (! lisp_time_argument (specified_time, &value, NULL))
- error ("Invalid time specification");
-
/* Convert to a string in ctime format, except without the trailing
newline, and without the 4-digit year limit. Don't use asctime
or ctime, as they might dump core if the year is outside the
the data it can't find. */)
(Lisp_Object specified_time)
{
- time_t value;
+ EMACS_TIME value;
int offset;
struct tm *t;
struct tm localtm;
Lisp_Object zone_offset, zone_name;
zone_offset = Qnil;
- zone_name = format_time_string ("%Z", sizeof "%Z" - 1, specified_time,
- 0, &value, &localtm);
+ EMACS_SET_SECS_NSECS (value, lisp_seconds_argument (specified_time), 0);
+ zone_name = format_time_string ("%Z", sizeof "%Z" - 1, value, 0, &localtm);
BLOCK_INPUT;
- t = gmtime (&value);
+ t = gmtime (EMACS_SECS_ADDR (value));
if (t)
offset = tm_diff (&localtm, t);
UNBLOCK_INPUT;
HCoop / bpt / emacs.git / blobdiff