[libc] add wcschr

Author: RossComputerGuy

libc/config/gpu/entrypoints.txt

@@ -261,6 +261,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.time.nanosleep
 
     # wchar.h entrypoints
+    libc.src.wchar.wcschr
     libc.src.wchar.wcslen
     libc.src.wchar.wmemchr
     libc.src.wchar.wctob

libc/config/linux/aarch64/entrypoints.txt

@@ -349,6 +349,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.unistd.write
 
     # wchar.h entrypoints
+    libc.src.wchar.wcschr
     libc.src.wchar.wcslen
     libc.src.wchar.wmemchr
     libc.src.wchar.wctob

libc/config/linux/riscv/entrypoints.txt

@@ -346,6 +346,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.unistd.write
 
     # wchar.h entrypoints
+    libc.src.wchar.wcschr
     libc.src.wchar.wcslen
     libc.src.wchar.wmemchr
     libc.src.wchar.wctob

libc/config/linux/x86_64/entrypoints.txt

@@ -348,6 +348,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.unistd.write
 
     # wchar.h entrypoints
+    libc.src.wchar.wcschr
     libc.src.wchar.wcslen
     libc.src.wchar.wmemchr
     libc.src.wchar.wctob

libc/hdrgen/yaml/wchar.yaml

@@ -28,3 +28,10 @@ functions:
     return_type: size_t
     arguments:
       - type: const wchar_t *
+  - name: wcschr
+    standards:
+      - stdc
+    return_type: const wchar_t *
+    arguments:
+      - type: const wchar_t *
+      - type: wchar_t

libc/src/wchar/CMakeLists.txt

@@ -34,3 +34,27 @@ add_entrypoint_object(
     libc.hdr.types.wchar_t
     libc.src.__support.wctype_utils
 )
+
+add_entrypoint_object(
+  wcslen
+  SRCS
+    wcslen.cpp
+  HDRS
+    wcslen.h
+  DEPENDS
+    libc.hdr.types.size_t
+    libc.hdr.types.wchar_t
+    libc.src.__support.wctype_utils
+)
+
+add_entrypoint_object(
+  wcschr
+  SRCS
+    wcschr.cpp
+  HDRS
+    wcschr.h
+  DEPENDS
+    .wcslen
+    .wmemchr
+    libc.hdr.types.wchar_t
+)

libc/src/wchar/wcschr.cpp

@@ -0,0 +1,21 @@
+//===-- 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 "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "wcslen.h"
+#include "wmemchr.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(const wchar_t *, wcschr, (const wchar_t *s, wchar_t c)) {
+  return wmemchr(s, c, wcslen(s));
+}
+
+} // namespace LIBC_NAMESPACE_DECL

libc/src/wchar/wcschr.h

@@ -0,0 +1,21 @@
+//===-- Implementation header for wmemchr -----------------------*- 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_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