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-rw-r--r--security/tomoyo/util.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/security/tomoyo/util.c b/security/tomoyo/util.c
index daf7a45f70f1..7ff54c95e1f2 100644
--- a/security/tomoyo/util.c
+++ b/security/tomoyo/util.c
@@ -47,6 +47,47 @@ const u8 tomoyo_index2category[TOMOYO_MAX_MAC_INDEX] = {
};
/**
+ * tomoyo_convert_time - Convert time_t to YYYY/MM/DD hh/mm/ss.
+ *
+ * @time: Seconds since 1970/01/01 00:00:00.
+ * @stamp: Pointer to "struct tomoyo_time".
+ *
+ * Returns nothing.
+ *
+ * This function does not handle Y2038 problem.
+ */
+void tomoyo_convert_time(time_t time, struct tomoyo_time *stamp)
+{
+ static const u16 tomoyo_eom[2][12] = {
+ { 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
+ { 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
+ };
+ u16 y;
+ u8 m;
+ bool r;
+ stamp->sec = time % 60;
+ time /= 60;
+ stamp->min = time % 60;
+ time /= 60;
+ stamp->hour = time % 24;
+ time /= 24;
+ for (y = 1970; ; y++) {
+ const unsigned short days = (y & 3) ? 365 : 366;
+ if (time < days)
+ break;
+ time -= days;
+ }
+ r = (y & 3) == 0;
+ for (m = 0; m < 11 && time >= tomoyo_eom[r][m]; m++)
+ ;
+ if (m)
+ time -= tomoyo_eom[r][m - 1];
+ stamp->year = y;
+ stamp->month = ++m;
+ stamp->day = ++time;
+}
+
+/**
* tomoyo_permstr - Find permission keywords.
*
* @string: String representation for permissions in foo/bar/buz format.