[libc]: implement 'iswalnum' entrypoint (#185581)

- Added entry points for `iswalnum`  for the following platforms: 
  - baremetal/arm
  - baremetal/riscv
  - dawin/aarch64
  - linux/x86_64
  - linux/arm
  - linux/aarch64
  - linux/riscv
  - windows
- Added a unit test for `iswalnum`
 
part of #185136

libc/config/baremetal/arm/entrypoints.txt

@@ -302,6 +302,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.wctype.iswgraph
     libc.src.wctype.iswcntrl
     libc.src.wctype.iswdigit
+    libc.src.wctype.iswalnum
     libc.src.wctype.iswlower
     libc.src.wctype.iswspace
     libc.src.wctype.iswblank

libc/config/baremetal/riscv/entrypoints.txt

@@ -299,6 +299,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.wctype.iswgraph
     libc.src.wctype.iswcntrl
     libc.src.wctype.iswdigit
+    libc.src.wctype.iswalnum
     libc.src.wctype.iswlower
     libc.src.wctype.iswspace
     libc.src.wctype.iswblank

libc/config/darwin/aarch64/entrypoints.txt

@@ -105,6 +105,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.wctype.iswgraph
     libc.src.wctype.iswcntrl
     libc.src.wctype.iswdigit
+    libc.src.wctype.iswalnum
     libc.src.wctype.iswlower
     libc.src.wctype.iswspace
     libc.src.wctype.iswblank

libc/config/linux/aarch64/entrypoints.txt

@@ -372,6 +372,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.wctype.iswgraph
     libc.src.wctype.iswcntrl
     libc.src.wctype.iswdigit
+    libc.src.wctype.iswalnum
     libc.src.wctype.iswlower
     libc.src.wctype.iswspace
     libc.src.wctype.iswblank

libc/config/linux/arm/entrypoints.txt

@@ -197,6 +197,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.wctype.iswgraph
     libc.src.wctype.iswcntrl
     libc.src.wctype.iswdigit
+    libc.src.wctype.iswalnum
     libc.src.wctype.iswlower
     libc.src.wctype.iswspace
     libc.src.wctype.iswblank

libc/config/linux/riscv/entrypoints.txt

@@ -376,6 +376,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.wctype.iswgraph
     libc.src.wctype.iswcntrl
     libc.src.wctype.iswdigit
+    libc.src.wctype.iswalnum
     libc.src.wctype.iswlower
     libc.src.wctype.iswspace
     libc.src.wctype.iswblank

libc/config/linux/x86_64/entrypoints.txt

@@ -421,6 +421,7 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.wctype.iswgraph
     libc.src.wctype.iswcntrl
     libc.src.wctype.iswdigit
+    libc.src.wctype.iswalnum
     libc.src.wctype.iswlower
     libc.src.wctype.iswspace
     libc.src.wctype.iswblank

libc/config/windows/entrypoints.txt

@@ -108,6 +108,7 @@ set(TARGET_LIBC_ENTRYPOINTS
 
     # wctype.h entrypoints
     libc.src.wctype.iswalpha
+    libc.src.wctype.iswalnum
     libc.src.wctype.iswgraph
     libc.src.wctype.iswcntrl
     libc.src.wctype.iswlower

libc/include/wctype.yaml

@@ -44,3 +44,9 @@ functions:
     return_type: int
     arguments:
       - type: wint_t
+  - name: iswalnum
+    standards:
+      - stdc
+    return_type: int
+    arguments:
+      - type: wint_t

libc/src/wctype/CMakeLists.txt

@@ -26,7 +26,18 @@ add_entrypoint_object(
   HDRS
     iswdigit.h
   DEPENDS
-    libc.src.__support.wctype_utils    
+    libc.src.__support.wctype_utils
+)
+
+add_entrypoint_object(
+  iswalnum
+  SRCS
+    iswalnum.cpp
+  HDRS
+    iswalnum.h
+  DEPENDS
+    libc.src.__support.wctype_utils
+    libc.hdr.types.wint_t
 )
 
 add_entrypoint_object(

libc/src/wctype/iswalnum.cpp

@@ -0,0 +1,20 @@
+//===-- Implementation of iswalnum ----------------------------------------===//
+//
+// 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/wctype/iswalnum.h"
+#include "src/__support/common.h"
+#include "src/__support/wctype_utils.h"
+
+#include "hdr/types/wint_t.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(int, iswalnum, (wint_t c)) {
+  return internal::isalnum(static_cast<wchar_t>(c));
+}
+} // namespace LIBC_NAMESPACE_DECL

libc/src/wctype/iswalnum.h

@@ -0,0 +1,20 @@
+//===-- Implementation header for iswalnum ----------------------*- 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_WCTYPE_ISWALNUM_H
+#define LLVM_LIBC_SRC_WCTYPE_ISWALNUM_H
+
+#include "hdr/types/wint_t.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+int iswalnum(wint_t c);
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_WCTYPE_ISWALNUM_H

libc/test/src/wctype/CMakeLists.txt

@@ -81,3 +81,13 @@ add_libc_test(
   DEPENDS
     libc.src.wctype.iswxdigit
 )
+
+add_libc_test(
+  iswalnum_test
+  SUITE
+    libc_wctype_unittests
+  SRCS
+    iswalnum_test.cpp
+  DEPENDS
+    libc.src.wctype.iswalnum
+)

libc/test/src/wctype/iswalnum_test.cpp

@@ -0,0 +1,24 @@
+//===-- Unittests for iswalnum --------------------------------------------===//
+//
+// 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/wctype/iswalnum.h"
+#include "test/UnitTest/Test.h"
+
+TEST(LlvmLibciswalnum, SimpleTest) {
+  EXPECT_NE(LIBC_NAMESPACE::iswalnum('A'), 0);
+  EXPECT_NE(LIBC_NAMESPACE::iswalnum('z'), 0);
+  EXPECT_NE(LIBC_NAMESPACE::iswalnum('0'), 0);
+
+  EXPECT_EQ(LIBC_NAMESPACE::iswalnum(' '), 0);
+  EXPECT_EQ(LIBC_NAMESPACE::iswalnum('?'), 0);
+  EXPECT_EQ(LIBC_NAMESPACE::iswalnum('\0'), 0);
+  EXPECT_EQ(LIBC_NAMESPACE::iswalnum(-1), 0);
+  EXPECT_EQ(LIBC_NAMESPACE::iswalnum('a'), 1);
+  EXPECT_EQ(LIBC_NAMESPACE::iswalnum('Z'), 1);
+  EXPECT_EQ(LIBC_NAMESPACE::iswalnum('9'), 1);
+}