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sribee8Sriya Pratipati
sribee8
and
Sriya Pratipati
authored
[libc] wcscspn implementation (#146158)
Implemented wcscspn and tests. --------- Co-authored-by: Sriya Pratipati <[email protected]>
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‎libc/config/linux/x86_64/entrypoints.txt

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@@ -376,6 +376,7 @@ set(TARGET_LIBC_ENTRYPOINTS
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libc.src.wchar.wcspbrk
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libc.src.wchar.wcsrchr
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libc.src.wchar.wcsspn
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libc.src.wchar.wcscspn
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libc.src.wchar.wmemcmp
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libc.src.wchar.wmempcpy
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libc.src.wchar.wmemcpy

‎libc/include/wchar.yaml

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@@ -104,6 +104,13 @@ functions:
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arguments:
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- type: const wchar_t *
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- type: const wchar_t *
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- name: wcscspn
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standards:
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- stdc
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return_type: size_t
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arguments:
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- type: const wchar_t *
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- type: const wchar_t *
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- name: wmemcmp
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standards:
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- stdc

‎libc/src/wchar/CMakeLists.txt

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@@ -213,6 +213,17 @@ add_entrypoint_object(
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libc.hdr.types.size_t
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)
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add_entrypoint_object(
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wcscspn
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SRCS
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wcscspn.cpp
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HDRS
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wcscspn.h
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DEPENDS
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libc.hdr.wchar_macros
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libc.hdr.types.size_t
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)
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add_entrypoint_object(
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wmemcmp
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SRCS

‎libc/src/wchar/wcscspn.cpp

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//===-- Implementation of wcscspn -----------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "src/wchar/wcscspn.h"
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#include "hdr/types/size_t.h"
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#include "hdr/types/wchar_t.h"
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#include "src/__support/common.h"
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#include "src/__support/macros/config.h"
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namespace LIBC_NAMESPACE_DECL {
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bool check(wchar_t c, const wchar_t *s2) {
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for (int n = 0; s2[n]; ++n) {
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if (s2[n] == c)
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return false;
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}
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return true;
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}
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LLVM_LIBC_FUNCTION(size_t, wcscspn, (const wchar_t *s1, const wchar_t *s2)) {
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size_t i = 0;
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for (; s1[i]; ++i) {
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if (!check(s1[i], s2))
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return i;
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}
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return i;
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}
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} // namespace LIBC_NAMESPACE_DECL

‎libc/src/wchar/wcscspn.h

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@@ -0,0 +1,22 @@
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//===-- Implementation header for wcscspn ---------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIBC_SRC_WCHAR_WCSCSPN_H
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#define LLVM_LIBC_SRC_WCHAR_WCSCSPN_H
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#include "hdr/types/size_t.h"
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#include "hdr/types/wchar_t.h"
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#include "src/__support/macros/config.h"
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namespace LIBC_NAMESPACE_DECL {
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size_t wcscspn(const wchar_t *s1, const wchar_t *s2);
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} // namespace LIBC_NAMESPACE_DECL
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#endif // LLVM_LIBC_SRC_WCHAR_WCSCSPN_H

‎libc/test/src/wchar/CMakeLists.txt

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@@ -183,6 +183,16 @@ add_libc_test(
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libc.src.wchar.wcsspn
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)
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add_libc_test(
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wcscspn_test
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SUITE
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libc_wchar_unittests
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SRCS
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wcscspn_test.cpp
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DEPENDS
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libc.src.wchar.wcscspn
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)
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add_libc_test(
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wmemchr_test
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SUITE

‎libc/test/src/wchar/wcscspn_test.cpp

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//===-- Unittests for wcscspn ---------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "hdr/types/size_t.h"
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#include "hdr/types/wchar_t.h"
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#include "src/wchar/wcscspn.h"
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#include "test/UnitTest/Test.h"
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TEST(LlvmLibcWCSCSpnTest, EmptyStringShouldReturnZeroLengthSpan) {
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// The search should not include the null terminator.
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EXPECT_EQ(LIBC_NAMESPACE::wcscspn(L"", L""), size_t(0));
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EXPECT_EQ(LIBC_NAMESPACE::wcscspn(L"_", L""), size_t(1));
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EXPECT_EQ(LIBC_NAMESPACE::wcscspn(L"", L"_"), size_t(0));
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}
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TEST(LlvmLibcWCSCSpnTest, ShouldNotSpanAnythingAfterNullTerminator) {
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const wchar_t src[4] = {L'a', L'b', L'\0', L'c'};
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EXPECT_EQ(LIBC_NAMESPACE::wcscspn(src, L"de"), size_t(2));
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EXPECT_EQ(LIBC_NAMESPACE::wcscspn(src, L"c"), size_t(2));
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// Same goes for the segment to be searched for.
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const wchar_t segment[4] = {L'1', L'2', L'\0', L'3'};
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EXPECT_EQ(LIBC_NAMESPACE::wcscspn(L"3", segment), size_t(1));
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}
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TEST(LlvmLibcWCSCSpnTest, SpanEachIndividualCharacter) {
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const wchar_t *src = L"12345";
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// These are all in the segment.
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EXPECT_EQ(LIBC_NAMESPACE::wcscspn(src, L"1"), size_t(0));
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EXPECT_EQ(LIBC_NAMESPACE::wcscspn(src, L"2"), size_t(1));
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EXPECT_EQ(LIBC_NAMESPACE::wcscspn(src, L"3"), size_t(2));
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EXPECT_EQ(LIBC_NAMESPACE::wcscspn(src, L"4"), size_t(3));
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EXPECT_EQ(LIBC_NAMESPACE::wcscspn(src, L"5"), size_t(4));
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}
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TEST(LlvmLibcWCSCSpnTest, UnmatchedCharacterShouldReturnLength) {
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EXPECT_EQ(LIBC_NAMESPACE::wcscspn(L"a", L"b"), size_t(1));
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EXPECT_EQ(LIBC_NAMESPACE::wcscspn(L"abcdef", L"1"), size_t(6));
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EXPECT_EQ(LIBC_NAMESPACE::wcscspn(L"123", L"4"), size_t(3));
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}
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TEST(LlvmLibcWCSCSpnTest, NonSequentialCharactersShouldNotSpan) {
48+
const wchar_t *src = L"abc456789";
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EXPECT_EQ(LIBC_NAMESPACE::wcscspn(src, L"_1_abc_2_def_3_"), size_t(0));
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EXPECT_EQ(LIBC_NAMESPACE::wcscspn(src, L"67__34xyz12"), size_t(3));
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}
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TEST(LlvmLibcWCSCSpnTest, ReverseCharacters) {
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// These are all in the string.
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EXPECT_EQ(LIBC_NAMESPACE::wcscspn(L"12345", L"54321"), size_t(0));
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// 1 is not in the span.
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EXPECT_EQ(LIBC_NAMESPACE::wcscspn(L"12345", L"432"), size_t(1));
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// 1 is in the span.
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EXPECT_EQ(LIBC_NAMESPACE::wcscspn(L"12345", L"51"), size_t(0));
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}
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TEST(LlvmLibcWCSCSpnTest, DuplicatedCharactersToBeSearchedForShouldStillMatch) {
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EXPECT_EQ(LIBC_NAMESPACE::wcscspn(L"a", L"aa"), size_t(0));
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EXPECT_EQ(LIBC_NAMESPACE::wcscspn(L"aa", L"aa"), size_t(0));
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EXPECT_EQ(LIBC_NAMESPACE::wcscspn(L"aaa", L"bb"), size_t(3));
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EXPECT_EQ(LIBC_NAMESPACE::wcscspn(L"aaaa", L"bb"), size_t(4));
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}

‎utils/bazel/llvm-project-overlay/libc/BUILD.bazel

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@@ -5815,6 +5815,18 @@ libc_function(
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],
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)
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libc_function(
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name = "wcscspn",
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srcs = ["src/wchar/wcscspn.cpp"],
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hdrs = ["src/wchar/wcscspn.h"],
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deps = [
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":__support_common",
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":__support_macros_config",
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":types_size_t",
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":types_wchar_t",
5827+
],
5828+
)
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libc_function(
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name = "wcslen",
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srcs = ["src/wchar/wcslen.cpp"],

‎utils/bazel/llvm-project-overlay/libc/test/src/wchar/BUILD.bazel

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],
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)
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libc_test(
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name = "wcscspn_test",
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srcs = ["wcscspn_test.cpp"],
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deps = [
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"//libc:types_size_t",
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"//libc:types_wchar_t",
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"//libc:wcscspn",
83+
],
84+
)
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libc_test(
7787
name = "wcslen_test",
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srcs = ["wcslen_test.cpp"],

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