[libc] Implement wcs to mbs family of functions

[uzairnawaz]

Implemented internal wcs to mbs internal function + tests
Impelemented wcs to mbs public functions

[github-actions]

⚠️ C/C++ code formatter, clang-format found issues in your code. ⚠️

You can test this locally with the following command:

git-clang-format --diff HEAD~1 HEAD --extensions cpp,h -- libc/src/__support/wchar/wcsnrtombs.cpp libc/src/__support/wchar/wcsnrtombs.h libc/src/wchar/wcsnrtombs.cpp libc/src/wchar/wcsnrtombs.h libc/src/wchar/wcsrtombs.cpp libc/src/wchar/wcsrtombs.h libc/src/wchar/wcstombs.cpp libc/src/wchar/wcstombs.h libc/test/src/__support/wchar/wcsnrtombs_test.cpp libc/test/src/wchar/wcsnrtombs_test.cpp libc/test/src/wchar/wcsrtombs_test.cpp libc/test/src/wchar/wcstombs_test.cpp

View the diff from clang-format here.

diff --git a/libc/src/wchar/wcsnrtombs.h b/libc/src/wchar/wcsnrtombs.h
index 793d38366..aef87e9e6 100644
--- a/libc/src/wchar/wcsnrtombs.h
+++ b/libc/src/wchar/wcsnrtombs.h
@@ -1,4 +1,5 @@
-//===-- Implementation header for wcsnrtombs -------------------------------===//
+//===-- Implementation header for wcsnrtombs
+//-------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
@@ -16,7 +17,8 @@
 
 namespace LIBC_NAMESPACE_DECL {
 
-size_t wcsnrtombs(char *__restrict s, const wchar_t **__restrict pwcs, size_t nwc, size_t len, mbstate_t* ps);
+size_t wcsnrtombs(char *__restrict s, const wchar_t **__restrict pwcs,
+                  size_t nwc, size_t len, mbstate_t *ps);
 
 } // namespace LIBC_NAMESPACE_DECL
 
diff --git a/libc/src/wchar/wcsrtombs.h b/libc/src/wchar/wcsrtombs.h
index af69fccdb..6a426925e 100644
--- a/libc/src/wchar/wcsrtombs.h
+++ b/libc/src/wchar/wcsrtombs.h
@@ -1,4 +1,5 @@
-//===-- Implementation header for wcsrtombs --------------------------------===//
+//===-- Implementation header for wcsrtombs
+//--------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
@@ -16,7 +17,8 @@
 
 namespace LIBC_NAMESPACE_DECL {
 
-size_t wcsrtombs(char *__restrict s, const wchar_t **__restrict pwcs, size_t n, mbstate_t* ps);
+size_t wcsrtombs(char *__restrict s, const wchar_t **__restrict pwcs, size_t n,
+                 mbstate_t *ps);
 
 } // namespace LIBC_NAMESPACE_DECL
 
diff --git a/libc/test/src/__support/wchar/wcsnrtombs_test.cpp b/libc/test/src/__support/wchar/wcsnrtombs_test.cpp
index 710fc4b56..d8f523c6d 100644
--- a/libc/test/src/__support/wchar/wcsnrtombs_test.cpp
+++ b/libc/test/src/__support/wchar/wcsnrtombs_test.cpp
@@ -110,7 +110,8 @@ TEST(LlvmLibcWcsnrtombs, SrcLimit) {
   ASSERT_EQ(mbs[6], '\x91');
   ASSERT_EQ(mbs[7], '\x01');
 
-  res = LIBC_NAMESPACE::internal::wcsnrtombs(mbs + res.value(), &cur, 100, 11, &state);
+  res = LIBC_NAMESPACE::internal::wcsnrtombs(mbs + res.value(), &cur, 100, 11,
+                                             &state);
   ASSERT_TRUE(res.has_value());
   ASSERT_EQ(res.value(), static_cast<size_t>(3));
   ASSERT_EQ(cur, nullptr);
diff --git a/libc/test/src/wchar/wcstombs_test.cpp b/libc/test/src/wchar/wcstombs_test.cpp
index 397ce0460..61e0873dc 100644
--- a/libc/test/src/wchar/wcstombs_test.cpp
+++ b/libc/test/src/wchar/wcstombs_test.cpp
@@ -79,7 +79,6 @@ TEST_F(LlvmLibcWcstombs, ErrnoTest) {
   // n parameter ignored when dest is null
   ASSERT_EQ(LIBC_NAMESPACE::wcstombs(mbs, src, 7), static_cast<size_t>(7));
   ASSERT_ERRNO_SUCCESS();
-  ASSERT_EQ(LIBC_NAMESPACE::wcstombs(mbs, src, 100),
-            static_cast<size_t>(-1));
+  ASSERT_EQ(LIBC_NAMESPACE::wcstombs(mbs, src, 100), static_cast<size_t>(-1));
   ASSERT_ERRNO_EQ(EILSEQ);
 }