[glibc/zack/y2038-preliminaries] Don’t use the argument to time.

[Zack Weinberg <zack@sourceware.org>]

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c101e8b1860b24eba152d92b5551b3d231113508

commit c101e8b1860b24eba152d92b5551b3d231113508
Author: Zack Weinberg <zackw@panix.com>
Date:   Fri Aug 16 21:10:11 2019 -0400

    Don’t use the argument to time.
    
    Unlike gettimeofday, I don’t think it makes sense to remove all the
    internal uses of time.  Its callers don’t care about sub-second
    resolution and would be unnecessarily complicated if they had to
    declare a struct timespec instead of just a time_t.  However, a
    handful of places were using the vestigial ‘result’ argument instead
    of the return value, which is ever so slightly less efficient and also
    looks weird.  Correct this.
    
    	* misc/syslog.c (__vsyslog_internal)
    	* string/strfry.c (strfry)
    	* time/getdate.c (__getdate_r)
    	* time/tst_wcsftime.c (main):
    	Use return value of time, not its argument.
    
    	* sysdeps/mach/sleep.c (__sleep): Remove unnecessary casts of NULL.

Diff:
---
 misc/syslog.c        | 2 +-
 string/strfry.c      | 2 +-
 sysdeps/mach/sleep.c | 4 ++--
 time/getdate.c       | 2 +-
 time/tst_wcsftime.c  | 2 +-
 5 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/misc/syslog.c b/misc/syslog.c
index 3a15da4..cf2deef 100644
--- a/misc/syslog.c
+++ b/misc/syslog.c
@@ -205,7 +205,7 @@ __vsyslog_internal(int pri, const char *fmt, va_list ap,
 	  {
 	    __fsetlocking (f, FSETLOCKING_BYCALLER);
 	    fprintf (f, "<%d>", pri);
-	    (void) time (&now);
+	    now = time (NULL);
 	    f->_IO_write_ptr += __strftime_l (f->_IO_write_ptr,
 					      f->_IO_write_end
 					      - f->_IO_write_ptr,
diff --git a/string/strfry.c b/string/strfry.c
index af6087b..71686d4 100644
--- a/string/strfry.c
+++ b/string/strfry.c
@@ -30,7 +30,7 @@ strfry (char *string)
     {
       static char state[32];
       rdata.state = NULL;
-      __initstate_r (time ((time_t *) NULL) ^ getpid (),
+      __initstate_r (time (NULL) ^ getpid (),
 		     state, sizeof (state), &rdata);
       init = 1;
     }
diff --git a/sysdeps/mach/sleep.c b/sysdeps/mach/sleep.c
index 11e1bb8..c63ef92 100644
--- a/sysdeps/mach/sleep.c
+++ b/sysdeps/mach/sleep.c
@@ -33,10 +33,10 @@ __sleep (unsigned int seconds)
 
   recv = __mach_reply_port ();
 
-  before = time ((time_t *) NULL);
+  before = time (NULL);
   (void) __mach_msg (NULL, MACH_RCV_MSG|MACH_RCV_TIMEOUT|MACH_RCV_INTERRUPT,
 		     0, 0, recv, seconds * 1000, MACH_PORT_NULL);
-  after = time ((time_t *) NULL);
+  after = time (NULL);
   __mach_port_destroy (__mach_task_self (), recv);
 
   return seconds - (after - before);
diff --git a/time/getdate.c b/time/getdate.c
index aee96f7..8a567c3 100644
--- a/time/getdate.c
+++ b/time/getdate.c
@@ -219,7 +219,7 @@ __getdate_r (const char *string, struct tm *tp)
     return 7;
 
   /* Get current time.  */
-  time (&timer);
+  timer = time (NULL);
   __localtime_r (&timer, &tm);
 
   /* If only the weekday is given, today is assumed if the given day
diff --git a/time/tst_wcsftime.c b/time/tst_wcsftime.c
index 3f6f0d9..55c45f6 100644
--- a/time/tst_wcsftime.c
+++ b/time/tst_wcsftime.c
@@ -10,7 +10,7 @@ main (int argc, char *argv[])
   int result = 0;
   size_t n;
 
-  time (&t);
+  t = time (NULL);
   tp = gmtime (&t);
 
   n = wcsftime (buf, sizeof (buf) / sizeof (buf[0]),