From e7dd5e45f6722ebb8bc8d5f612e0119bb02bc196 Mon Sep 17 00:00:00 2001
From: Sam Clegg <sbc@chromium.org>
Date: Tue, 3 Dec 2024 09:18:24 -0800
Subject: [PATCH] Add wcsftime from musl. NFC

See #23045
---
 test/other/test_wcsftime.c   | 37 ++++++++++++++++++++++++++++++++++++
 test/other/test_wcsftime.out |  1 +
 test/test_other.py           |  4 ++++
 tools/system_libs.py         |  2 ++
 4 files changed, 44 insertions(+)
 create mode 100644 test/other/test_wcsftime.c
 create mode 100644 test/other/test_wcsftime.out

diff --git a/test/other/test_wcsftime.c b/test/other/test_wcsftime.c
new file mode 100644
index 0000000000000..de403d8788a5b
--- /dev/null
+++ b/test/other/test_wcsftime.c
@@ -0,0 +1,37 @@
+// Copyright 2017 The Emscripten Authors.  All rights reserved.
+// Emscripten is available under two separate licenses, the MIT license and the
+// University of Illinois/NCSA Open Source License.  Both these licenses can be
+// found in the LICENSE file.
+
+#include <assert.h>
+#include <time.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <wchar.h>
+
+int main() {
+  struct tm tm;
+  wchar_t s[1000];
+
+  // Ensure all fields of `tm` are initialized correctly
+  // before we start messing with them.
+  time_t t = 0;
+  gmtime_r(&t, &tm);
+
+  tm.tm_sec = 4;
+  tm.tm_min = 23;
+  tm.tm_hour = 20;
+  tm.tm_mday = 21;
+  tm.tm_mon = 1;
+  tm.tm_year = 74;
+  tm.tm_wday = 4;
+  tm.tm_yday = 51;
+  tm.tm_isdst = 0;
+
+  const wchar_t *fmt = L"%m/%d/%Y %H:%M:%S %Z";
+  wcsftime(s, sizeof(s), fmt, &tm);
+  printf("%ls -> %ls\n", fmt, s);
+
+  return 0;
+}
diff --git a/test/other/test_wcsftime.out b/test/other/test_wcsftime.out
new file mode 100644
index 0000000000000..507e1bc44ff2b
--- /dev/null
+++ b/test/other/test_wcsftime.out
@@ -0,0 +1 @@
+%m/%d/%Y %H:%M:%S %Z -> 02/21/1974 20:23:04 GMT
diff --git a/test/test_other.py b/test/test_other.py
index 543fbffae1a52..630edf777ed55 100644
--- a/test/test_other.py
+++ b/test/test_other.py
@@ -6193,6 +6193,10 @@ def test_strptime_reentrant(self):
   def test_strftime(self):
     self.do_other_test('test_strftime.c')
 
+  @crossplatform
+  def test_wcsftime(self):
+    self.do_other_test('test_wcsftime.c')
+
   @crossplatform
   def test_strftime_zZ(self):
     if MACOS:
diff --git a/tools/system_libs.py b/tools/system_libs.py
index b37363d588451..6f25349163344 100644
--- a/tools/system_libs.py
+++ b/tools/system_libs.py
@@ -1233,7 +1233,9 @@ def get_files(self):
           '__tm_to_secs.c',
           '__year_to_secs.c',
           '__month_to_secs.c',
+          'wcsftime.c',
         ])
+
     libc_files += files_in_path(
         path='system/lib/libc/musl/src/legacy',
         filenames=['getpagesize.c', 'err.c', 'euidaccess.c'])