309 lines
8.5 KiB
C++
309 lines
8.5 KiB
C++
// A C++ interface to POSIX functions.
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//
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// Copyright (c) 2012 - 2016, Victor Zverovich
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// All rights reserved.
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//
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// For the license information refer to format.h.
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#ifndef FMT_POSIX_H_
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#define FMT_POSIX_H_
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#if defined(__MINGW32__) || defined(__CYGWIN__)
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// Workaround MinGW bug https://sourceforge.net/p/mingw/bugs/2024/.
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# undef __STRICT_ANSI__
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#endif
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#include <errno.h>
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#include <fcntl.h> // for O_RDONLY
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#include <locale.h> // for locale_t
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#include <stdio.h>
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#include <stdlib.h> // for strtod_l
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#include <cstddef>
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#if defined __APPLE__ || defined(__FreeBSD__)
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# include <xlocale.h> // for LC_NUMERIC_MASK on OS X
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#endif
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#include "format.h"
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#ifndef FMT_POSIX
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# if defined(_WIN32) && !defined(__MINGW32__)
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// Fix warnings about deprecated symbols.
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# define FMT_POSIX(call) _##call
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# else
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# define FMT_POSIX(call) call
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# endif
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#endif
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// Calls to system functions are wrapped in FMT_SYSTEM for testability.
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#ifdef FMT_SYSTEM
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# define FMT_POSIX_CALL(call) FMT_SYSTEM(call)
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#else
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# define FMT_SYSTEM(call) call
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# ifdef _WIN32
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// Fix warnings about deprecated symbols.
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# define FMT_POSIX_CALL(call) ::_##call
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# else
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# define FMT_POSIX_CALL(call) ::call
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# endif
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#endif
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// Retries the expression while it evaluates to error_result and errno
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// equals to EINTR.
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#ifndef _WIN32
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# define FMT_RETRY_VAL(result, expression, error_result) \
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do { \
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result = (expression); \
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} while (result == error_result && errno == EINTR)
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#else
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# define FMT_RETRY_VAL(result, expression, error_result) result = (expression)
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#endif
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#define FMT_RETRY(result, expression) FMT_RETRY_VAL(result, expression, -1)
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FMT_BEGIN_NAMESPACE
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/**
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\rst
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A reference to a null-terminated string. It can be constructed from a C
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string or ``std::string``.
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You can use one of the following type aliases for common character types:
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+---------------+-----------------------------+
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| Type | Definition |
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+===============+=============================+
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| cstring_view | basic_cstring_view<char> |
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+---------------+-----------------------------+
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| wcstring_view | basic_cstring_view<wchar_t> |
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+---------------+-----------------------------+
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This class is most useful as a parameter type to allow passing
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different types of strings to a function, for example::
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template <typename... Args>
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std::string format(cstring_view format_str, const Args & ... args);
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format("{}", 42);
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format(std::string("{}"), 42);
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\endrst
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*/
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template <typename Char> class basic_cstring_view {
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private:
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const Char* data_;
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public:
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/** Constructs a string reference object from a C string. */
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basic_cstring_view(const Char* s) : data_(s) {}
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/**
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\rst
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Constructs a string reference from an ``std::string`` object.
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\endrst
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*/
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basic_cstring_view(const std::basic_string<Char>& s) : data_(s.c_str()) {}
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/** Returns the pointer to a C string. */
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const Char* c_str() const { return data_; }
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};
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using cstring_view = basic_cstring_view<char>;
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using wcstring_view = basic_cstring_view<wchar_t>;
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// An error code.
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class error_code {
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private:
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int value_;
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public:
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explicit error_code(int value = 0) FMT_NOEXCEPT : value_(value) {}
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int get() const FMT_NOEXCEPT { return value_; }
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};
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// A buffered file.
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class buffered_file {
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private:
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FILE* file_;
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friend class file;
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explicit buffered_file(FILE* f) : file_(f) {}
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public:
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buffered_file(const buffered_file&) = delete;
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void operator=(const buffered_file&) = delete;
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// Constructs a buffered_file object which doesn't represent any file.
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buffered_file() FMT_NOEXCEPT : file_(nullptr) {}
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// Destroys the object closing the file it represents if any.
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FMT_API ~buffered_file() FMT_NOEXCEPT;
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public:
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buffered_file(buffered_file&& other) FMT_NOEXCEPT : file_(other.file_) {
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other.file_ = nullptr;
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}
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buffered_file& operator=(buffered_file&& other) {
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close();
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file_ = other.file_;
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other.file_ = nullptr;
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return *this;
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}
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// Opens a file.
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FMT_API buffered_file(cstring_view filename, cstring_view mode);
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// Closes the file.
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FMT_API void close();
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// Returns the pointer to a FILE object representing this file.
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FILE* get() const FMT_NOEXCEPT { return file_; }
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// We place parentheses around fileno to workaround a bug in some versions
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// of MinGW that define fileno as a macro.
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FMT_API int(fileno)() const;
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void vprint(string_view format_str, format_args args) {
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fmt::vprint(file_, format_str, args);
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}
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template <typename... Args>
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inline void print(string_view format_str, const Args&... args) {
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vprint(format_str, make_format_args(args...));
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}
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};
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// A file. Closed file is represented by a file object with descriptor -1.
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// Methods that are not declared with FMT_NOEXCEPT may throw
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// fmt::system_error in case of failure. Note that some errors such as
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// closing the file multiple times will cause a crash on Windows rather
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// than an exception. You can get standard behavior by overriding the
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// invalid parameter handler with _set_invalid_parameter_handler.
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class file {
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private:
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int fd_; // File descriptor.
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// Constructs a file object with a given descriptor.
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explicit file(int fd) : fd_(fd) {}
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public:
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// Possible values for the oflag argument to the constructor.
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enum {
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RDONLY = FMT_POSIX(O_RDONLY), // Open for reading only.
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WRONLY = FMT_POSIX(O_WRONLY), // Open for writing only.
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RDWR = FMT_POSIX(O_RDWR) // Open for reading and writing.
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};
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// Constructs a file object which doesn't represent any file.
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file() FMT_NOEXCEPT : fd_(-1) {}
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// Opens a file and constructs a file object representing this file.
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FMT_API file(cstring_view path, int oflag);
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public:
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file(const file&) = delete;
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void operator=(const file&) = delete;
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file(file&& other) FMT_NOEXCEPT : fd_(other.fd_) { other.fd_ = -1; }
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file& operator=(file&& other) {
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close();
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fd_ = other.fd_;
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other.fd_ = -1;
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return *this;
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}
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// Destroys the object closing the file it represents if any.
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FMT_API ~file() FMT_NOEXCEPT;
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// Returns the file descriptor.
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int descriptor() const FMT_NOEXCEPT { return fd_; }
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// Closes the file.
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FMT_API void close();
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// Returns the file size. The size has signed type for consistency with
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// stat::st_size.
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FMT_API long long size() const;
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// Attempts to read count bytes from the file into the specified buffer.
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FMT_API std::size_t read(void* buffer, std::size_t count);
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// Attempts to write count bytes from the specified buffer to the file.
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FMT_API std::size_t write(const void* buffer, std::size_t count);
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// Duplicates a file descriptor with the dup function and returns
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// the duplicate as a file object.
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FMT_API static file dup(int fd);
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// Makes fd be the copy of this file descriptor, closing fd first if
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// necessary.
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FMT_API void dup2(int fd);
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// Makes fd be the copy of this file descriptor, closing fd first if
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// necessary.
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FMT_API void dup2(int fd, error_code& ec) FMT_NOEXCEPT;
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// Creates a pipe setting up read_end and write_end file objects for reading
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// and writing respectively.
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FMT_API static void pipe(file& read_end, file& write_end);
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// Creates a buffered_file object associated with this file and detaches
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// this file object from the file.
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FMT_API buffered_file fdopen(const char* mode);
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};
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// Returns the memory page size.
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long getpagesize();
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#ifdef FMT_LOCALE
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// A "C" numeric locale.
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class Locale {
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private:
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# ifdef _WIN32
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using locale_t = _locale_t;
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enum { LC_NUMERIC_MASK = LC_NUMERIC };
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static locale_t newlocale(int category_mask, const char* locale, locale_t) {
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return _create_locale(category_mask, locale);
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}
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static void freelocale(locale_t locale) { _free_locale(locale); }
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static double strtod_l(const char* nptr, char** endptr, _locale_t locale) {
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return _strtod_l(nptr, endptr, locale);
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}
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# endif
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locale_t locale_;
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public:
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using type = locale_t;
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Locale(const Locale&) = delete;
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void operator=(const Locale&) = delete;
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Locale() : locale_(newlocale(LC_NUMERIC_MASK, "C", nullptr)) {
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if (!locale_) FMT_THROW(system_error(errno, "cannot create locale"));
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}
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~Locale() { freelocale(locale_); }
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type get() const { return locale_; }
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// Converts string to floating-point number and advances str past the end
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// of the parsed input.
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double strtod(const char*& str) const {
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char* end = nullptr;
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double result = strtod_l(str, &end, locale_);
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str = end;
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return result;
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}
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};
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#endif // FMT_LOCALE
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FMT_END_NAMESPACE
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#endif // FMT_POSIX_H_
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