[glibc] time: Add 64-bit time_t support for ftime

[glibc] time: Add 64-bit time_t support for ftime

[Adhemerval Zanella]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=5d8aa97da2332a818579bbb24880f9d44715448a

commit 5d8aa97da2332a818579bbb24880f9d44715448a
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Mon Oct 19 11:51:48 2020 -0300

    time: Add 64-bit time_t support for ftime
    
    It basically calls the 64-bit __clock_gettime64 and adds the overflow
    check.
    
    Checked on x86_64-linux-gnu and i686-linux-gnu.
    
    Reviewed-by: Lukasz Majewski <lukma@denx.de>

Diff:
---
 include/bits/types/struct_timeb.h |  1 +
 include/struct___timeb64.h        | 16 ++++++++++++++++
 include/sys/timeb.h               | 12 ++++++++++++
 time/Makefile                     |  2 +-
 time/bits/types/struct_timeb.h    | 15 +++++++++++++++
 time/ftime.c                      | 28 ++++++++++++++++++++++++----
 time/sys/timeb.h                  | 12 +-----------
 7 files changed, 70 insertions(+), 16 deletions(-)

diff --git a/include/bits/types/struct_timeb.h b/include/bits/types/struct_timeb.h
new file mode 100644
index 0000000000..fef74d2f44
--- /dev/null
+++ b/include/bits/types/struct_timeb.h
@@ -0,0 +1 @@
+#include <time/bits/types/struct_timeb.h>
diff --git a/include/struct___timeb64.h b/include/struct___timeb64.h
new file mode 100644
index 0000000000..14704a9e30
--- /dev/null
+++ b/include/struct___timeb64.h
@@ -0,0 +1,16 @@
+#ifndef _STRUCT_TIMEB64_H
+#define _STRUCT_TIMEB64_H
+
+#if __TIMESIZE == 64
+# define __timeb64 timeb
+#else
+struct __timeb64
+{
+  __time64_t time;
+  unsigned short int millitm;
+  short int timezone;
+  short int dstflag;
+};
+#endif
+
+#endif /* _STRUCT_TIMEB64_H  */
diff --git a/include/sys/timeb.h b/include/sys/timeb.h
index 9f4509c35e..2b01dafea7 100644
--- a/include/sys/timeb.h
+++ b/include/sys/timeb.h
@@ -1 +1,13 @@
 #include <time/sys/timeb.h>
+
+#ifndef _ISOMAC
+# if __TIMESIZE == 64
+#  define __timeb64  timeb
+#  define __ftime64  ftime
+# else
+#  include <struct___timeb64.h>
+
+extern int __ftime64 (struct __timeb64 *) __nonnull ((1));
+libc_hidden_proto (__ftime64);
+# endif
+#endif
diff --git a/time/Makefile b/time/Makefile
index a4fb13d6a3..26aa835166 100644
--- a/time/Makefile
+++ b/time/Makefile
@@ -27,7 +27,7 @@ headers := time.h sys/time.h sys/timeb.h bits/time.h			\
 	   bits/types/struct_itimerspec.h				\
 	   bits/types/struct_timespec.h bits/types/struct_timeval.h	\
 	   bits/types/struct_tm.h bits/types/timer_t.h			\
-	   bits/types/time_t.h
+	   bits/types/time_t.h bits/types/struct_timeb.h
 
 routines := offtime asctime clock ctime ctime_r difftime \
 	    gmtime localtime mktime time		 \
diff --git a/time/bits/types/struct_timeb.h b/time/bits/types/struct_timeb.h
new file mode 100644
index 0000000000..1fe60c7131
--- /dev/null
+++ b/time/bits/types/struct_timeb.h
@@ -0,0 +1,15 @@
+#ifndef __timeb_defined
+#define __timeb_defined 1
+
+#include <bits/types/time_t.h>
+
+/* Structure returned by the 'ftime' function.  */
+struct timeb
+  {
+    time_t time;		/* Seconds since epoch, as from 'time'.  */
+    unsigned short int millitm;	/* Additional milliseconds.  */
+    short int timezone;		/* Minutes west of GMT.  */
+    short int dstflag;		/* Nonzero if Daylight Savings Time used.  */
+  };
+
+#endif
diff --git a/time/ftime.c b/time/ftime.c
index 70a2590c17..91ba100503 100644
--- a/time/ftime.c
+++ b/time/ftime.c
@@ -18,13 +18,13 @@
 
 #include <features.h>
 #include <sys/timeb.h>
-#include <time.h>
+#include <errno.h>
 
 int
-ftime (struct timeb *timebuf)
+__ftime64 (struct __timeb64 *timebuf)
 {
-  struct timespec ts;
-  __clock_gettime (CLOCK_REALTIME, &ts);
+  struct __timespec64 ts;
+  __clock_gettime64 (CLOCK_REALTIME, &ts);
 
   timebuf->time = ts.tv_sec;
   timebuf->millitm = ts.tv_nsec / 1000000;
@@ -32,3 +32,23 @@ ftime (struct timeb *timebuf)
   timebuf->dstflag = 0;
   return 0;
 }
+#if __TIMESIZE != 64
+libc_hidden_def (__ftime64)
+
+int
+ftime (struct timeb *timebuf)
+{
+  struct __timeb64 tb64;
+  __ftime64 (&tb64);
+  if (! in_time_t_range (tb64.time))
+    {
+      __set_errno (EOVERFLOW);
+      return -1;
+    }
+  timebuf->time = tb64.time;
+  timebuf->millitm = tb64.millitm;
+  timebuf->timezone = tb64.timezone;
+  timebuf->dstflag = tb64.dstflag;
+  return 0;
+}
+#endif
diff --git a/time/sys/timeb.h b/time/sys/timeb.h
index d6cdf29111..bbad4eb8c0 100644
--- a/time/sys/timeb.h
+++ b/time/sys/timeb.h
@@ -20,19 +20,9 @@
 
 #include <features.h>
 
-#include <bits/types/time_t.h>
-
 __BEGIN_DECLS
 
-/* Structure returned by the `ftime' function.  */
-
-struct timeb
-  {
-    time_t time;		/* Seconds since epoch, as from `time'.  */
-    unsigned short int millitm;	/* Additional milliseconds.  */
-    short int timezone;		/* Minutes west of GMT.  */
-    short int dstflag;		/* Nonzero if Daylight Savings Time used.  */
-  };
+# include <bits/types/struct_timeb.h>
 
 /* Fill in TIMEBUF with information about the current time.  */