fix: timezone char length

Author: Зишан Мирза

libc/src/time/time_utils.cpp

@@ -34,15 +34,15 @@ void release_file(FILE *fp) {
   fclose(fp);
 }
 
-void acquire_file(FILE *fp, char *timezone) {
+void acquire_file(FILE *fp, char *timezone, size_t timezone_size) {
   while (1) {
     if (file_usage == 0) {
       file_usage = 1;
       break;
     }
   }
 
-  if (fgets(timezone, sizeof(timezone), fp) == NULL) {
+  if (fgets(timezone, (int)timezone_size, fp) == NULL) {
     release_file(fp);
   }
 }
@@ -150,15 +150,15 @@ int64_t update_from_seconds(int64_t total_seconds, struct tm *tm) {
   if (years > INT_MAX || years < INT_MIN)
     return time_utils::out_of_range();
 
-  char timezone[128];
+  char timezone[TimeConstants::TIMEZONE_SIZE];
 
   FILE *fp = NULL;
   fp = fopen("/etc/timezone", "rb");
   if (fp == NULL) {
     // TODO: implement getting timezone from `TZ` environment variable and
     // storing the value in `timezone`
   } else {
-    acquire_file(fp, timezone);
+    acquire_file(fp, timezone, TimeConstants::TIMEZONE_SIZE);
   }
 
   if (file_usage == 0) {

libc/src/time/time_utils.h

@@ -81,6 +81,8 @@ struct TimeConstants {
   static constexpr int END_OF32_BIT_EPOCH_YEAR = 2038;
 
   static constexpr time_t OUT_OF_RANGE_RETURN_VALUE = -1;
+
+  static constexpr size_t TIMEZONE_SIZE = 128;
 };
 
 // Update the "tm" structure's year, month, etc. members from seconds.