From 20aa5819586ac7ad11f711bab64feda307965191 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Mon, 18 Mar 2019 14:14:15 -0700
Subject: Make mktime etc. compatible with __time64_t

Keep these functions compatible with Gnulib while adding
__time64_t support.  The basic idea is to move private API
declarations from include/time.h to time/mktime-internal.h, since
the former file cannot easily be shared with Gnulib whereas the
latter can.
Also, do some other minor cleanup while in the neighborhood.
* include/time.h: Include stdbool.h, time/mktime-internal.h.
(__mktime_internal): Move this prototype to time/mktime-internal.h,
since Gnulib needs it.
(__localtime64_r, __gmtime64_r) [__TIMESIZE == 64]:
Move these macros to time/mktime-internal.h, since Gnulib needs them.
(__mktime64, __timegm64) [__TIMESIZE != 64]: New prototypes.
(in_time_t_range): New static function.
* posix/bits/types.h (__time64_t) [__TIMESIZE == 64 && !defined __LIBC]:
Do not define as a macro in this case, so that portable code is
less tempted to use __time64_t.
* time/mktime-internal.h: Rewrite so that it does both glibc
and Gnulib work.  Include time.h if not _LIBC.
(mktime_offset_t) [!_LIBC]: Define for gnulib.
(__time64_t, __gmtime64_r, __localtime64_r, __mktime64, __timegm64)
[!_LIBC || __TIMESIZE == 64]: New macros, mostly moved here
from include/time.h.
(__gmtime_r, __localtime_r, __mktime_internal) [!_LIBC]:
New macros, taken from GNulib.
(__mktime_internal): New prototype, moved here from include/time.h.
* time/mktime.c (mktime_min, mktime_max, convert_time)
(ranged_convert, __mktime_internal, __mktime64):
* time/timegm.c (__timegm64):
Use __time64_t, not time_t.
* time/mktime.c: Stop worrying about whether time_t is floating-point.
(__mktime64) [! (_LIBC && __TIMESIZE != 64)]:
Rename from mktime.
(mktime) [_LIBC && __TIMESIZE != 64]: New function.
* time/timegm.c [!_LIBC]: Include libc-config.h, not config.h,
for libc_hidden_def.
Include errno.h.
(__timegm64) [! (_LIBC && __TIMESIZE != 64)]:
Rename from timegm.
(timegm) [_LIBC && __TIMESIZE != 64]: New function.

First cut at publicizing __time64_t
---
 include/time.h | 39 ++++++++++++++++++++-------------------
 1 file changed, 20 insertions(+), 19 deletions(-)

(limited to 'include')

diff --git a/include/time.h b/include/time.h
index 61dd9e180b..ac3163c2a5 100644
--- a/include/time.h
+++ b/include/time.h
@@ -3,6 +3,8 @@
 
 #ifndef _ISOMAC
 # include <bits/types/locale_t.h>
+# include <stdbool.h>
+# include <time/mktime-internal.h>
 
 extern __typeof (strftime_l) __strftime_l;
 libc_hidden_proto (__strftime_l)
@@ -49,19 +51,11 @@ extern void __tzset_parse_tz (const char *tz) attribute_hidden;
 extern void __tz_compute (__time64_t timer, struct tm *tm, int use_localtime)
   __THROW attribute_hidden;
 
-/* Subroutine of `mktime'.  Return the `time_t' representation of TP and
-   normalize TP, given that a `struct tm *' maps to a `time_t' as performed
-   by FUNC.  Record next guess for localtime-gmtime offset in *OFFSET.  */
-extern time_t __mktime_internal (struct tm *__tp,
-				 struct tm *(*__func) (const time_t *,
-						       struct tm *),
-				 long int *__offset) attribute_hidden;
-
 #if __TIMESIZE == 64
 # define __ctime64 ctime
 #else
 extern char *__ctime64 (const __time64_t *__timer) __THROW;
-libc_hidden_proto (__ctime64);
+libc_hidden_proto (__ctime64)
 #endif
 
 #if __TIMESIZE == 64
@@ -69,7 +63,7 @@ libc_hidden_proto (__ctime64);
 #else
 extern char *__ctime64_r (const __time64_t *__restrict __timer,
 		          char *__restrict __buf) __THROW;
-libc_hidden_proto (__ctime64_r);
+libc_hidden_proto (__ctime64_r)
 #endif
 
 #if __TIMESIZE == 64
@@ -81,13 +75,13 @@ libc_hidden_proto (__localtime64)
 
 extern struct tm *__localtime_r (const time_t *__timer,
 				 struct tm *__tp) attribute_hidden;
-
-#if __TIMESIZE == 64
-# define __localtime64_r __localtime_r
-#else
+#if __TIMESIZE != 64
 extern struct tm *__localtime64_r (const __time64_t *__timer,
 				   struct tm *__tp);
 libc_hidden_proto (__localtime64_r)
+
+extern __time64_t __mktime64 (struct tm *__tp) __THROW;
+libc_hidden_proto (__mktime64)
 #endif
 
 extern struct tm *__gmtime_r (const time_t *__restrict __timer,
@@ -99,14 +93,13 @@ libc_hidden_proto (__gmtime_r)
 #else
 extern struct tm *__gmtime64 (const __time64_t *__timer);
 libc_hidden_proto (__gmtime64)
-#endif
 
-#if __TIMESIZE == 64
-# define __gmtime64_r __gmtime_r
-#else
 extern struct tm *__gmtime64_r (const __time64_t *__restrict __timer,
 				struct tm *__restrict __tp);
-libc_hidden_proto (__gmtime64_r);
+libc_hidden_proto (__gmtime64_r)
+
+extern __time64_t __timegm64 (struct tm *__tp) __THROW;
+libc_hidden_proto (__timegm64)
 #endif
 
 /* Compute the `struct tm' representation of T,
@@ -155,5 +148,13 @@ extern double __difftime (time_t time1, time_t time0);
    actual clock ID.  */
 #define CLOCK_IDFIELD_SIZE	3
 
+/* Check whether T fits in time_t.  */
+static inline bool
+in_time_t_range (__time64_t t)
+{
+  time_t s = t;
+  return s == t;
+}
+
 #endif
 #endif
-- 
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