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Add glibc stream support

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This commit is contained in:
Victor Zverovich 2024-01-27 10:03:45 -08:00
parent b5669512b1
commit ffce3632b7
1 changed files with 41 additions and 2 deletions
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43
include/fmt/format-inl.h
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@ -1471,14 +1471,44 @@ template <typename F> class file_base {
// A FILE wrapper for glibc.
template <typename F> class glibc_file : public file_base<F> {
private:
enum {
line_buffered = 0x200, // _IO_LINE_BUF
unbuffered = 2 // _IO_UNBUFFERED
};
public:
using file_base<F>::file_base;
auto is_buffered() const -> bool {
return (this->file_->_flags & unbuffered) == 0;
}
// Returns the file's read buffer as a string_view.
auto get_read_buffer() const -> span<const char> {
return {this->file_->_IO_read_ptr,
to_unsigned(this->file_->_IO_read_end - this->file_->_IO_read_ptr)};
}
auto get_write_buffer() const -> span<char> {
char*& ptr = this->file_->_IO_write_ptr;
char*& end = this->file_->_IO_buf_end;
if (!ptr || ptr == end) {
// Force buffer initialization by placing and removing a char in a buffer.
putc_unlocked(0, this->file_);
--ptr;
}
FMT_ASSERT(ptr < end, "");
return {ptr, static_cast<size_t>(end - ptr)};
}
void advance_write_buffer(size_t size) { this->file_->_IO_write_ptr += size; }
bool needs_flush() const {
if ((this->file_->_flags & line_buffered) == 0) return false;
char* end = this->file_->_IO_write_end;
return memchr(end, '\n', to_unsigned(this->file_->_IO_write_ptr - end));
}
};
// A FILE wrapper for Apple's libc.
@ -1488,11 +1518,16 @@ template <typename F> class apple_file : public file_base<F> {
return this->file_->_p - this->file_->_bf._base;
}
enum {
line_buffered = 1, // __SNBF
unbuffered = 2 // __SLBF
};
public:
using file_base<F>::file_base;
auto is_buffered() const -> bool {
return (this->file_->_flags & 2) == 0; // 2 is __SNBF.
return (this->file_->_flags & unbuffered) == 0;
}
auto get_read_buffer() const -> span<const char> {
@ -1519,7 +1554,7 @@ template <typename F> class apple_file : public file_base<F> {
}
bool needs_flush() const {
if ((this->file_->_flags & 1) == 0) return false; // 1 is __SLBF.
if ((this->file_->_flags & line_buffered) == 0) return false;
return memchr(this->file_->_p + this->file_->_w, '\n',
to_unsigned(-this->file_->_w));
}
@ -1561,6 +1596,10 @@ template <typename F, FMT_ENABLE_IF(sizeof(F::_p) != 0)>
auto get_file(F* f, int) -> apple_file<F> {
return f;
}
template <typename F, FMT_ENABLE_IF(sizeof(F::_IO_read_ptr) != 0)>
inline auto get_file(F* f, int) -> glibc_file<F> {
return f;
}
inline auto get_file(FILE* f, ...) -> fallback_file<FILE> { return f; }
using file_ref = decltype(get_file(static_cast<FILE*>(nullptr), 0));