mirror of
https://github.com/boykopovar/AnyPS5.git
synced 2026-11-08 13:50:20 +00:00
MarcZX10
978bfebaf3
Find the first or last occurrence of a NUL-terminated UTF-16 substring in a NUL-terminated string following ICU 78.1 ustring.cpp (u_strFindFirst and u_strFindLast). A match is rejected when it starts on a trail surrogate that follows a lead surrogate or ends on a lead surrogate that is followed by a trail surrogate, so it never splits a pair. A null substring or an empty one returns the string, and a null string with a substring returns null. The two sceIcuUnknown stubs with these NIDs are removed.
58 lines
2.1 KiB
C++
58 lines
2.1 KiB
C++
#include "prx/libSceIcu/libSceIcu.hpp"
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#include <cstddef>
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#include <cstdint>
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namespace {
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constexpr std::size_t Unbounded = static_cast<std::size_t>(-1);
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bool Lead(char16_t unit) { return unit >= 0xd800 && unit <= 0xdbff; }
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bool Trail(char16_t unit) { return unit >= 0xdc00 && unit <= 0xdfff; }
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std::size_t Measure(const char16_t* text) {
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std::size_t length = 0;
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while (text[length] != 0) ++length;
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return length;
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}
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bool Matches(const char16_t* text, std::size_t textLength, std::size_t index, const char16_t* sub, std::size_t subLength) {
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for (std::size_t offset = 0; offset < subLength; ++offset) {
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if (text[index + offset] != sub[offset]) return false;
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}
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if (Trail(text[index]) && index > 0 && Lead(text[index - 1])) return false;
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const auto end = index + subLength;
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return !(Lead(text[end - 1]) && end < textLength && Trail(text[end]));
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}
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}
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extern "C" {
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char16_t* APS5_VABI u_strstr_nid_postfix(const char16_t* text, const char16_t* sub) {
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if (!sub) return const_cast<char16_t*>(text);
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if (!text) return nullptr;
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if (*sub == 0) return const_cast<char16_t*>(text);
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const auto subLength = Measure(sub);
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for (std::size_t index = 0; text[index] != 0; ++index) {
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std::size_t offset = 0;
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while (offset < subLength && text[index + offset] == sub[offset]) ++offset;
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if (offset == subLength && Matches(text, Unbounded, index, sub, subLength)) return const_cast<char16_t*>(text + index);
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if (offset < subLength && text[index + offset] == 0) return nullptr;
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}
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return nullptr;
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}
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char16_t* APS5_VABI u_strrstr_nid_postfix(const char16_t* text, const char16_t* sub) {
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if (!sub) return const_cast<char16_t*>(text);
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if (!text) return nullptr;
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const auto subLength = Measure(sub);
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if (subLength == 0) return const_cast<char16_t*>(text);
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const auto length = Measure(text);
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for (std::size_t index = length < subLength ? 0 : length - subLength + 1; index-- > 0;) {
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if (Matches(text, length, index, sub, subLength)) return const_cast<char16_t*>(text + index);
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}
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return nullptr;
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}
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}
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