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libcxx: backport llvm/llvm-project#147389

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https://github.com/llvm/llvm-project/pull/147389
This commit is contained in:
Alex Rønne Petersen 2025-10-14 12:07:43 +02:00
parent 820dc9d767
commit 10ea69912f
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1 changed files with 24 additions and 11 deletions
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35
lib/libcxx/include/fstream vendored
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@ -821,6 +821,14 @@ typename basic_filebuf<_CharT, _Traits>::int_type basic_filebuf<_CharT, _Traits>
template <class _CharT, class _Traits>
typename basic_filebuf<_CharT, _Traits>::int_type basic_filebuf<_CharT, _Traits>::overflow(int_type __c) {
auto __failed = [this]() {
if (this->pptr() == this->epptr() + 1) {
this->pbump(-1); // lose the character we overflowed above -- we don't really have a
// choice since we couldn't commit the contents of the put area
}
return traits_type::eof();
};
if (__file_ == nullptr)
return traits_type::eof();
__write_mode();
@ -841,8 +849,9 @@ typename basic_filebuf<_CharT, _Traits>::int_type basic_filebuf<_CharT, _Traits>
if (__always_noconv_) {
size_t __n = static_cast<size_t>(this->pptr() - this->pbase());
if (std::fwrite(this->pbase(), sizeof(char_type), __n, __file_) != __n)
return traits_type::eof();
if (std::fwrite(this->pbase(), sizeof(char_type), __n, __file_) != __n) {
return __failed();
}
} else {
if (!__cv_)
std::__throw_bad_cast();
@ -854,34 +863,38 @@ typename basic_filebuf<_CharT, _Traits>::int_type basic_filebuf<_CharT, _Traits>
char* __extbuf_end = __extbuf_;
do {
codecvt_base::result __r = __cv_->out(__st_, __b, __p, __end, __extbuf_, __extbuf_ + __ebs_, __extbuf_end);
if (__end == __b)
return traits_type::eof();
if (__end == __b) {
return __failed();
}
// No conversion needed: output characters directly to the file, done.
if (__r == codecvt_base::noconv) {
size_t __n = static_cast<size_t>(__p - __b);
if (std::fwrite(__b, 1, __n, __file_) != __n)
return traits_type::eof();
if (std::fwrite(__b, 1, __n, __file_) != __n) {
return __failed();
}
break;
// Conversion successful: output the converted characters to the file, done.
} else if (__r == codecvt_base::ok) {
size_t __n = static_cast<size_t>(__extbuf_end - __extbuf_);
if (std::fwrite(__extbuf_, 1, __n, __file_) != __n)
return traits_type::eof();
if (std::fwrite(__extbuf_, 1, __n, __file_) != __n) {
return __failed();
}
break;
// Conversion partially successful: output converted characters to the file and repeat with the
// remaining characters.
} else if (__r == codecvt_base::partial) {
size_t __n = static_cast<size_t>(__extbuf_end - __extbuf_);
if (std::fwrite(__extbuf_, 1, __n, __file_) != __n)
return traits_type::eof();
if (std::fwrite(__extbuf_, 1, __n, __file_) != __n) {
return __failed();
}
__b = const_cast<char_type*>(__end);
continue;
} else {
return traits_type::eof();
return __failed();
}
} while (true);
}