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make -p buffer overrun fix with outlandish current time

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* src/main.c (safer_ctime): New function.
(print_data_base): Use it.
This commit is contained in:
Paul Eggert 2023-05-10 12:10:14 -07:00 committed by Paul Smith
parent 78e6a89b19
commit 032f784601
1 changed files with 14 additions and 2 deletions
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16
src/main.c
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@ -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";
}
static time_t
time_now (void)
{
@ -3758,7 +3770,7 @@ 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 ();
@ -3768,7 +3780,7 @@ print_data_base (void)
strcache_print_stats ("#");
when = time_now ();
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