[libc-commits] [libc] [libc] Implemented wcspbrk (PR #142040)
Uzair Nawaz via libc-commits
libc-commits at lists.llvm.org
Thu May 29 14:19:23 PDT 2025
https://github.com/uzairnawaz created https://github.com/llvm/llvm-project/pull/142040
Implemented wcspbrk and added tests
>From 7dd7eda3bc23d97a05dcf0e1accb21812ed3b2c2 Mon Sep 17 00:00:00 2001
From: Uzair Nawaz <uzairnawaz at google.com>
Date: Thu, 29 May 2025 21:11:52 +0000
Subject: [PATCH] implemented wcspbrk; added tests
---
libc/config/linux/x86_64/entrypoints.txt | 1 +
libc/include/wchar.yaml | 7 ++
libc/src/wchar/CMakeLists.txt | 11 ++++
libc/src/wchar/wcspbrk.cpp | 27 ++++++++
libc/src/wchar/wcspbrk.h | 21 ++++++
libc/test/src/wchar/CMakeLists.txt | 10 +++
libc/test/src/wchar/wcspbrk_test.cpp | 83 ++++++++++++++++++++++++
7 files changed, 160 insertions(+)
create mode 100644 libc/src/wchar/wcspbrk.cpp
create mode 100644 libc/src/wchar/wcspbrk.h
create mode 100644 libc/test/src/wchar/wcspbrk_test.cpp
diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index 52e746e32a1cd..593117f94b64e 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -365,6 +365,7 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.wchar.wcslen
libc.src.wchar.wctob
libc.src.wchar.wcschr
+ libc.src.wchar.wcspbrk
# sys/uio.h entrypoints
libc.src.sys.uio.writev
diff --git a/libc/include/wchar.yaml b/libc/include/wchar.yaml
index 987bdc0b806dc..52ebc6804d043 100644
--- a/libc/include/wchar.yaml
+++ b/libc/include/wchar.yaml
@@ -34,3 +34,10 @@ functions:
arguments:
- type: const wchar_t *
- type: wchar_t
+ - name: wcspbrk
+ standards:
+ - stdc
+ return_type: const wchar_t *
+ arguments:
+ - type: const wchar_t *
+ - type: const wchar_t *
diff --git a/libc/src/wchar/CMakeLists.txt b/libc/src/wchar/CMakeLists.txt
index 41034cab16d4d..4d923c5f14474 100644
--- a/libc/src/wchar/CMakeLists.txt
+++ b/libc/src/wchar/CMakeLists.txt
@@ -44,3 +44,14 @@ add_entrypoint_object(
libc.hdr.wchar_macros
libc.src.__support.wctype_utils
)
+
+add_entrypoint_object(
+ wcspbrk
+ SRCS
+ wcspbrk.cpp
+ HDRS
+ wcspbrk.h
+ DEPENDS
+ libc.hdr.wchar_macros
+ libc.src.__support.wctype_utils
+)
diff --git a/libc/src/wchar/wcspbrk.cpp b/libc/src/wchar/wcspbrk.cpp
new file mode 100644
index 0000000000000..e92be0853a5c0
--- /dev/null
+++ b/libc/src/wchar/wcspbrk.cpp
@@ -0,0 +1,27 @@
+//===-- Implementation of wcspbrk -----------------------------------------===//
+//
+// 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/wcspbrk.h"
+
+#include "hdr/types/wchar_t.h"
+#include "src/__support/common.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(const wchar_t *, wcspbrk,
+ (const wchar_t *src, const wchar_t *breakset)) {
+ // currently O(n * m), can be further optimized to O(n + m) with a hash set
+ for (int src_idx = 0; src[src_idx] != 0; src_idx++)
+ for (int breakset_idx = 0; breakset[breakset_idx] != 0; breakset_idx++)
+ if (src[src_idx] == breakset[breakset_idx])
+ return src + src_idx;
+
+ return nullptr;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/wchar/wcspbrk.h b/libc/src/wchar/wcspbrk.h
new file mode 100644
index 0000000000000..531651b0b723a
--- /dev/null
+++ b/libc/src/wchar/wcspbrk.h
@@ -0,0 +1,21 @@
+//===-- Implementation header for wcspbrk ---------------------------------===//
+//
+// 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_WCSPBRK_H
+#define LLVM_LIBC_SRC_WCHAR_WCSPBRK_H
+
+#include "hdr/types/wchar_t.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+const wchar_t *wcspbrk(const wchar_t *src, const wchar_t *breakset);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_WCHAR_WCSPBRK_H
diff --git a/libc/test/src/wchar/CMakeLists.txt b/libc/test/src/wchar/CMakeLists.txt
index 7d64dfeb13b6e..0e3d5c618ae1a 100644
--- a/libc/test/src/wchar/CMakeLists.txt
+++ b/libc/test/src/wchar/CMakeLists.txt
@@ -42,3 +42,13 @@ add_libc_test(
DEPENDS
libc.src.wchar.wcschr
)
+
+add_libc_test(
+ wcspbrk_test
+ SUITE
+ libc_wchar_unittests
+ SRCS
+ wcspbrk_test.cpp
+ DEPENDS
+ libc.src.wchar.wcspbrk
+)
diff --git a/libc/test/src/wchar/wcspbrk_test.cpp b/libc/test/src/wchar/wcspbrk_test.cpp
new file mode 100644
index 0000000000000..ac7ac473542d9
--- /dev/null
+++ b/libc/test/src/wchar/wcspbrk_test.cpp
@@ -0,0 +1,83 @@
+//===-- Unittests for wcspbrk
+//----------------------------------------------===//
+//
+// 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/wchar/wcspbrk.h"
+#include "test/UnitTest/Test.h"
+
+TEST(LlvmLibcWCSPBrkTest, EmptyStringShouldReturnNullptr) {
+ // The search should not include the null terminator.
+ EXPECT_EQ(LIBC_NAMESPACE::wcspbrk(L"", L""), nullptr);
+ EXPECT_EQ(LIBC_NAMESPACE::wcspbrk(L"_", L""), nullptr);
+ EXPECT_EQ(LIBC_NAMESPACE::wcspbrk(L"", L"_"), nullptr);
+}
+
+TEST(LlvmLibcWCSPBrkTest, ShouldNotFindAnythingAfterNullTerminator) {
+ const wchar_t src[4] = {'a', 'b', '\0', 'c'};
+ EXPECT_EQ(LIBC_NAMESPACE::wcspbrk(src, L"c"), nullptr);
+}
+
+TEST(LlvmLibcWCSPBrkTest, ShouldReturnNullptrIfNoCharactersFound) {
+ EXPECT_EQ(LIBC_NAMESPACE::wcspbrk(L"12345", L"abcdef"), nullptr);
+}
+
+TEST(LlvmLibcWCSPBrkTest, FindsFirstCharacter) {
+ const wchar_t *src = L"12345";
+ EXPECT_EQ(LIBC_NAMESPACE::wcspbrk(src, L"1"), src);
+ EXPECT_EQ(LIBC_NAMESPACE::wcspbrk(src, L"-1"), src);
+ EXPECT_EQ(LIBC_NAMESPACE::wcspbrk(src, L"1_"), src);
+ EXPECT_EQ(LIBC_NAMESPACE::wcspbrk(src, L"f1_"), src);
+
+ EXPECT_TRUE(src[0] == L'1');
+ EXPECT_TRUE(src[1] == L'2');
+ EXPECT_TRUE(src[2] == L'3');
+ EXPECT_TRUE(src[3] == L'4');
+ EXPECT_TRUE(src[4] == L'5');
+ EXPECT_TRUE(src[5] == 0);
+}
+
+TEST(LlvmLibcWCSPBrkTest, FindsMiddleCharacter) {
+ const wchar_t *src = L"12345";
+ EXPECT_EQ(LIBC_NAMESPACE::wcspbrk(src, L"3"), src + 2);
+ EXPECT_EQ(LIBC_NAMESPACE::wcspbrk(src, L"?3"), src + 2);
+ EXPECT_EQ(LIBC_NAMESPACE::wcspbrk(src, L"3F"), src + 2);
+ EXPECT_EQ(LIBC_NAMESPACE::wcspbrk(src, L"z3_"), src + 2);
+
+ EXPECT_TRUE(src[0] == L'1');
+ EXPECT_TRUE(src[1] == L'2');
+ EXPECT_TRUE(src[2] == L'3');
+ EXPECT_TRUE(src[3] == L'4');
+ EXPECT_TRUE(src[4] == L'5');
+ EXPECT_TRUE(src[5] == 0);
+}
+
+TEST(LlvmLibcWCSPBrkTest, FindsLastCharacter) {
+ const wchar_t *src = L"12345";
+ EXPECT_EQ(LIBC_NAMESPACE::wcspbrk(src, L"5"), src + 4);
+ EXPECT_EQ(LIBC_NAMESPACE::wcspbrk(src, L"r5"), src + 4);
+ EXPECT_EQ(LIBC_NAMESPACE::wcspbrk(src, L"59"), src + 4);
+ EXPECT_EQ(LIBC_NAMESPACE::wcspbrk(src, L"n5_"), src + 4);
+
+ EXPECT_TRUE(src[0] == L'1');
+ EXPECT_TRUE(src[1] == L'2');
+ EXPECT_TRUE(src[2] == L'3');
+ EXPECT_TRUE(src[3] == L'4');
+ EXPECT_TRUE(src[4] == L'5');
+ EXPECT_TRUE(src[5] == 0);
+}
+
+TEST(LlvmLibcWCSPBrkTest, FindsFirstOfRepeated) {
+ const wchar_t *src = L"A,B,C,D";
+ EXPECT_EQ(LIBC_NAMESPACE::wcspbrk(src, L","), src + 1);
+}
+
+TEST(LlvmLibcWCSPBrkTest, FindsFirstInBreakset) {
+ const wchar_t *src = L"12345";
+ EXPECT_EQ(LIBC_NAMESPACE::wcspbrk(src, L"34"), src + 2);
+}
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