[libc] Implement mbsinit (#150654)
Implemented public libc function to check if an mbstate describes an
empty state
diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index e8f59c9..5e8278e 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -1264,6 +1264,7 @@
# wchar.h entrypoints
libc.src.wchar.mblen
libc.src.wchar.mbrlen
+ libc.src.wchar.mbsinit
libc.src.wchar.mbrtowc
libc.src.wchar.mbtowc
libc.src.wchar.wcrtomb
diff --git a/libc/include/wchar.yaml b/libc/include/wchar.yaml
index 0285f19..6e1f595 100644
--- a/libc/include/wchar.yaml
+++ b/libc/include/wchar.yaml
@@ -53,6 +53,12 @@
- type: wchar_t *__restrict
- type: const char *__restrict
- type: size_t
+ - name: mbsinit
+ standards:
+ - stdc
+ return_type: int
+ arguments:
+ - type: mbstate_t *
- name: mblen
standards:
- stdc
diff --git a/libc/src/wchar/CMakeLists.txt b/libc/src/wchar/CMakeLists.txt
index 43f44a9..49f4a1b 100644
--- a/libc/src/wchar/CMakeLists.txt
+++ b/libc/src/wchar/CMakeLists.txt
@@ -137,6 +137,21 @@
)
add_entrypoint_object(
+ mbsinit
+ SRCS
+ mbsinit.cpp
+ HDRS
+ mbsinit.h
+ DEPENDS
+ libc.hdr.types.wchar_t
+ libc.hdr.types.mbstate_t
+ libc.src.__support.common
+ libc.src.__support.macros.config
+ libc.src.__support.wchar.character_converter
+ libc.src.__support.wchar.mbstate
+)
+
+add_entrypoint_object(
mbrtowc
SRCS
mbrtowc.cpp
diff --git a/libc/src/wchar/mbsinit.cpp b/libc/src/wchar/mbsinit.cpp
new file mode 100644
index 0000000..23ba542
--- /dev/null
+++ b/libc/src/wchar/mbsinit.cpp
@@ -0,0 +1,26 @@
+//===-- Implementation of mbsinit -----------------------------------------===//
+//
+// 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/mbsinit.h"
+
+#include "hdr/types/mbstate_t.h"
+#include "src/__support/common.h"
+#include "src/__support/macros/config.h"
+#include "src/__support/wchar/character_converter.h"
+#include "src/__support/wchar/mbstate.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(int, mbsinit, (mbstate_t * ps)) {
+ if (ps == nullptr)
+ return true;
+ internal::CharacterConverter cr(reinterpret_cast<internal::mbstate *>(ps));
+ return cr.isValidState() && cr.isEmpty();
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/wchar/mbsinit.h b/libc/src/wchar/mbsinit.h
new file mode 100644
index 0000000..fa6be0f
--- /dev/null
+++ b/libc/src/wchar/mbsinit.h
@@ -0,0 +1,22 @@
+//===-- Implementation header for mbsinit ---------------------------------===//
+//
+// 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_MBSINIT_H
+#define LLVM_LIBC_SRC_WCHAR_MBSINIT_H
+
+#include "hdr/types/mbstate_t.h"
+#include "hdr/types/size_t.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+int mbsinit(mbstate_t *ps);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_WCHAR_MBSINIT_H
diff --git a/libc/test/src/wchar/CMakeLists.txt b/libc/test/src/wchar/CMakeLists.txt
index f420ecc..fad89dc 100644
--- a/libc/test/src/wchar/CMakeLists.txt
+++ b/libc/test/src/wchar/CMakeLists.txt
@@ -99,7 +99,22 @@
libc.src.string.memset
libc.src.wchar.mbrlen
libc.hdr.types.mbstate_t
+ libc.hdr.types.wchar_t
libc.test.UnitTest.ErrnoCheckingTest
+)
+
+add_libc_test(
+ mbsinit_test
+ SUITE
+ libc_wchar_unittests
+ SRCS
+ mbsinit_test.cpp
+ DEPENDS
+ libc.src.string.memset
+ libc.src.wchar.mbsinit
+ libc.src.wchar.mbrtowc
+ libc.hdr.types.mbstate_t
+ libc.hdr.types.wchar_t
)
add_libc_test(
diff --git a/libc/test/src/wchar/mbsinit_test.cpp b/libc/test/src/wchar/mbsinit_test.cpp
new file mode 100644
index 0000000..ecb48aa
--- /dev/null
+++ b/libc/test/src/wchar/mbsinit_test.cpp
@@ -0,0 +1,33 @@
+//===-- Unittests for mbsinit ---------------------------------------------===//
+//
+// 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 "hdr/types/wchar_t.h"
+#include "src/string/memset.h"
+#include "src/wchar/mbrtowc.h"
+#include "src/wchar/mbsinit.h"
+#include "test/UnitTest/Test.h"
+
+TEST(LlvmLibcMBSInitTest, EmptyState) {
+ mbstate_t ps;
+ LIBC_NAMESPACE::memset(&ps, 0, sizeof(mbstate_t));
+ ASSERT_NE(LIBC_NAMESPACE::mbsinit(&ps), 0);
+ ASSERT_NE(LIBC_NAMESPACE::mbsinit(nullptr), 0);
+}
+
+TEST(LlvmLibcMBSInitTest, ConversionTest) {
+ const char *src = "\xf0\x9f\xa4\xa3"; // 4 byte emoji
+ wchar_t dest[2];
+ mbstate_t ps;
+ LIBC_NAMESPACE::memset(&ps, 0, sizeof(mbstate_t));
+
+ ASSERT_NE(LIBC_NAMESPACE::mbsinit(&ps), 0);
+ LIBC_NAMESPACE::mbrtowc(dest, src, 2, &ps); // partial conversion
+ ASSERT_EQ(LIBC_NAMESPACE::mbsinit(&ps), 0);
+ LIBC_NAMESPACE::mbrtowc(dest, src + 2, 2, &ps); // complete conversion
+ ASSERT_NE(LIBC_NAMESPACE::mbsinit(&ps), 0); // state should be reset now
+}
