[PATCH 1/3] make -p buffer overrun fix with outlandish current time

[Paul Eggert]

* src/main.c (safer_ctime): New function.
(print_data_base): Use it.
---
 src/main.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/src/main.c b/src/main.c
index 8215ed78..76e392de 100644
--- a/src/main.c
+++ b/src/main.c
@@ -3720,6 +3720,18 @@ print_version (void)
   printed_version = 1;
 }
 
+/* Like ctime, except do not have undefined behavior with timestamps
+   out of ctime range.  */
+static char const *
+safer_ctime (time_t *t)
+{
+  struct tm *tm = localtime (t);
+  if (tm && -999 - 1900 <= tm->tm_year && tm->tm_year <= 9999 - 1900)
+    return ctime (t);
+  else
+    return "(time out of range)\n";
+}
+
 /* Print a bunch of information about this and that.  */
 
 static void
@@ -3729,7 +3741,7 @@ print_data_base (void)
 
   print_version ();
 
-  printf (_("\n# Make data base, printed on %s"), ctime (&when));
+  printf (_("\n# Make data base, printed on %s"), safer_ctime (&when));
 
   print_variable_data_base ();
   print_dir_data_base ();
@@ -3739,7 +3751,7 @@ print_data_base (void)
   strcache_print_stats ("#");
 
   when = time ((time_t *) 0);
-  printf (_("\n# Finished Make data base on %s\n"), ctime (&when));
+  printf (_("\n# Finished Make data base on %s\n"), safer_ctime (&when));
 }
 
 static void
-- 
2.39.2