[llvm-libc] Add wchar from llvm-libc to overlay mode (#24710)

Related issue #24493

Author: google-yfyang

system/lib/llvm-libc/src/wchar/btowc.cpp

@@ -0,0 +1,28 @@
+//===-- Implementation of btowc -------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/wchar/btowc.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/wctype_utils.h"
+
+#include "hdr/types/wint_t.h"
+#include "hdr/wchar_macros.h" // for WEOF.
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(wint_t, btowc, (int c)) {
+  auto result = internal::btowc(c);
+  if (result.has_value()) {
+    return result.value();
+  } else {
+    return WEOF;
+  }
+}
+
+} // namespace LIBC_NAMESPACE_DECL

system/lib/llvm-libc/src/wchar/btowc.h

@@ -0,0 +1,21 @@
+//===-- Implementation header for btowc -------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_WCHAR_BTOWC_H
+#define LLVM_LIBC_SRC_WCHAR_BTOWC_H
+
+#include "hdr/types/wint_t.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+wint_t btowc(int c);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_WCHAR_BTOWC_H

system/lib/llvm-libc/src/wchar/wcscat.cpp

@@ -0,0 +1,29 @@
+//===-- Implementation of wcscat ------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/wchar/wcscat.h"
+
+#include "hdr/types/size_t.h"
+#include "hdr/types/wchar_t.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/string/string_utils.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(wchar_t *, wcscat,
+                   (wchar_t *__restrict s1, const wchar_t *__restrict s2)) {
+  size_t size_1 = internal::string_length(s1);
+  size_t i = 0;
+  for (; s2[i] != L'\0'; i++)
+    s1[size_1 + i] = s2[i];
+  s1[size_1 + i] = L'\0';
+  return s1;
+}
+
+} // namespace LIBC_NAMESPACE_DECL

system/lib/llvm-libc/src/wchar/wcscat.h

@@ -0,0 +1,21 @@
+//===-- Implementation header for wcscat ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_WCHAR_WCSCAT_H
+#define LLVM_LIBC_SRC_WCHAR_WCSCAT_H
+
+#include "hdr/types/wchar_t.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+wchar_t *wcscat(wchar_t *__restrict s1, const wchar_t *__restrict s2);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_WCHAR_WCSCAT_H

system/lib/llvm-libc/src/wchar/wcschr.cpp

@@ -0,0 +1,25 @@
+//===-- Implementation of wcschr ------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/wchar/wcschr.h"
+
+#include "hdr/types/wchar_t.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(const wchar_t *, wcschr, (const wchar_t *s, wchar_t c)) {
+  for (; *s && *s != c; ++s)
+    ;
+  if (*s == c)
+    return s;
+  return nullptr;
+}
+
+} // namespace LIBC_NAMESPACE_DECL

system/lib/llvm-libc/src/wchar/wcschr.h

@@ -0,0 +1,21 @@
+//===-- Implementation header for wcschr ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_WCHAR_WCSCHR_H
+#define LLVM_LIBC_SRC_WCHAR_WCSCHR_H
+
+#include "hdr/types/wchar_t.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+const wchar_t *wcschr(const wchar_t *s, wchar_t c);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_WCHAR_WCSCHR_H

system/lib/llvm-libc/src/wchar/wcscmp.cpp

@@ -0,0 +1,28 @@
+//===-- Implementation of wcscmp ------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/wchar/wcscmp.h"
+
+#include "hdr/types/size_t.h"
+#include "hdr/types/wchar_t.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/null_check.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(int, wcscmp, (const wchar_t *left, const wchar_t *right)) {
+  LIBC_CRASH_ON_NULLPTR(left);
+  LIBC_CRASH_ON_NULLPTR(right);
+
+  for (; *left && (*left == *right); ++left, ++right)
+    ;
+
+  return *left - *right;
+}
+
+} // namespace LIBC_NAMESPACE_DECL

system/lib/llvm-libc/src/wchar/wcscmp.h

@@ -0,0 +1,22 @@
+//===-- Implementation header for wcscmp ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_WCHAR_WCSCMP_H
+#define LLVM_LIBC_SRC_WCHAR_WCSCMP_H
+
+#include "hdr/types/size_t.h"
+#include "hdr/types/wchar_t.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+int wcscmp(const wchar_t *left, const wchar_t *right);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_WCHAR_WCSCMP_H

system/lib/llvm-libc/src/wchar/wcscpy.cpp

@@ -0,0 +1,26 @@
+//===-- Implementation of wcscpy ------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/wchar/wcscpy.h"
+
+#include "hdr/types/size_t.h"
+#include "hdr/types/wchar_t.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/string/string_utils.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(wchar_t *, wcscpy,
+                   (wchar_t *__restrict s1, const wchar_t *__restrict s2)) {
+  size_t size = internal::string_length(s2) + 1;
+  __builtin_memcpy(s1, s2, size * sizeof(wchar_t));
+  return s1;
+}
+
+} // namespace LIBC_NAMESPACE_DECL

system/lib/llvm-libc/src/wchar/wcscpy.h

@@ -0,0 +1,21 @@
+//===-- Implementation header for wcscpy ----------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_WCHAR_WCSCPY_H
+#define LLVM_LIBC_SRC_WCHAR_WCSCPY_H
+
+#include "hdr/types/wchar_t.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+wchar_t *wcscpy(wchar_t *__restrict s1, const wchar_t *__restrict s2);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_WCHAR_WCSCPY_H