vim-patch:8.1.1313: warnings for using localtime() and ctime()

Problem:    Warnings for using localtime() and ctime().
Solution:   Use localtime_r() if available.  Avoid using ctime().
https://github.com/vim/vim/commit/63d2555c9cefbbeeca3ec87fdd5d241e9488f9dd

1 files changed, 33 insertions, 0 deletions

diff --git a/src/nvim/os/time.c b/src/nvim/os/time.c
index 4dd0614fe2..fc04cdd55b 100644
--- a/src/nvim/os/time.c
+++ b/src/nvim/os/time.c
@@ -144,6 +144,39 @@ struct tm *os_localtime(struct tm *result) FUNC_ATTR_NONNULL_ALL
   return os_localtime_r(&rawtime, result);
 }
 
+/// Portable version of POSIX ctime_r()
+///
+/// @param clock[in]
+/// @param result[out] Pointer to a 'char' where the result should be placed
+/// @param result_len length of result buffer
+/// @return human-readable string of current local time
+char *os_ctime_r(const time_t *restrict clock, char *restrict result,
+                 size_t result_len)
+  FUNC_ATTR_NONNULL_ALL FUNC_ATTR_NONNULL_RET
+{
+  struct tm clock_local;
+  struct tm *clock_local_ptr = os_localtime_r(clock, &clock_local);
+  // MSVC returns NULL for an invalid value of seconds.
+  if (clock_local_ptr == NULL) {
+    snprintf(result, result_len, "%s\n", _("(Invalid)"));
+  } else {
+    strftime(result, result_len, "%a %b %d %H:%M:%S %Y\n", clock_local_ptr);
+  }
+  return result;
+}
+
+/// Gets the current Unix timestamp and adjusts it to local time.
+///
+/// @param result[out] Pointer to a 'char' where the result should be placed
+/// @param result_len length of result buffer
+/// @return human-readable string of current local time
+char *os_ctime(char *result, size_t result_len)
+  FUNC_ATTR_NONNULL_ALL FUNC_ATTR_NONNULL_RET
+{
+  time_t rawtime = time(NULL);
+  return os_ctime_r(&rawtime, result, result_len);
+}
+
 /// Obtains the current Unix timestamp.
 ///
 /// @return Seconds since epoch.