419 lines
10 KiB
C++
419 lines
10 KiB
C++
/*
|
|
A C++ interface to POSIX functions.
|
|
|
|
Copyright (c) 2012 - 2016, Victor Zverovich
|
|
All rights reserved.
|
|
|
|
For the license information refer to format.h.
|
|
*/
|
|
|
|
#ifndef FMT_POSIX_H_
|
|
#define FMT_POSIX_H_
|
|
|
|
#ifdef __MINGW32__
|
|
// Workaround MinGW bug https://sourceforge.net/p/mingw/bugs/2024/.
|
|
# undef __STRICT_ANSI__
|
|
#endif
|
|
|
|
#include <errno.h>
|
|
#include <fcntl.h> // for O_RDONLY
|
|
#include <locale.h> // for locale_t
|
|
#include <stdio.h>
|
|
#include <stdlib.h> // for strtod_l
|
|
|
|
#include <cstddef>
|
|
|
|
#if defined __APPLE__ || defined(__FreeBSD__)
|
|
# include <xlocale.h> // for LC_NUMERIC_MASK on OS X
|
|
#endif
|
|
|
|
#include "fmt/format.h"
|
|
|
|
#ifndef FMT_POSIX
|
|
# if defined(_WIN32) && !defined(__MINGW32__)
|
|
// Fix warnings about deprecated symbols.
|
|
# define FMT_POSIX(call) _##call
|
|
# else
|
|
# define FMT_POSIX(call) call
|
|
# endif
|
|
#endif
|
|
|
|
// Calls to system functions are wrapped in FMT_SYSTEM for testability.
|
|
#ifdef FMT_SYSTEM
|
|
# define FMT_POSIX_CALL(call) FMT_SYSTEM(call)
|
|
#else
|
|
# define FMT_SYSTEM(call) call
|
|
# ifdef _WIN32
|
|
// Fix warnings about deprecated symbols.
|
|
# define FMT_POSIX_CALL(call) ::_##call
|
|
# else
|
|
# define FMT_POSIX_CALL(call) ::call
|
|
# endif
|
|
#endif
|
|
|
|
// Retries the expression while it evaluates to error_result and errno
|
|
// equals to EINTR.
|
|
#ifndef _WIN32
|
|
# define FMT_RETRY_VAL(result, expression, error_result) \
|
|
do { \
|
|
result = (expression); \
|
|
} while (result == error_result && errno == EINTR)
|
|
#else
|
|
# define FMT_RETRY_VAL(result, expression, error_result) result = (expression)
|
|
#endif
|
|
|
|
#define FMT_RETRY(result, expression) FMT_RETRY_VAL(result, expression, -1)
|
|
|
|
namespace fmt {
|
|
|
|
/**
|
|
\rst
|
|
A reference to a null-terminated string. It can be constructed from a C
|
|
string or ``std::string``.
|
|
|
|
You can use one of the following typedefs for common character types:
|
|
|
|
+---------------+-----------------------------+
|
|
| Type | Definition |
|
|
+===============+=============================+
|
|
| cstring_view | basic_cstring_view<char> |
|
|
+---------------+-----------------------------+
|
|
| wcstring_view | basic_cstring_view<wchar_t> |
|
|
+---------------+-----------------------------+
|
|
|
|
This class is most useful as a parameter type to allow passing
|
|
different types of strings to a function, for example::
|
|
|
|
template <typename... Args>
|
|
std::string format(cstring_view format_str, const Args & ... args);
|
|
|
|
format("{}", 42);
|
|
format(std::string("{}"), 42);
|
|
\endrst
|
|
*/
|
|
template <typename Char>
|
|
class basic_cstring_view {
|
|
private:
|
|
const Char *data_;
|
|
|
|
public:
|
|
/** Constructs a string reference object from a C string. */
|
|
basic_cstring_view(const Char *s) : data_(s) {}
|
|
|
|
/**
|
|
\rst
|
|
Constructs a string reference from an ``std::string`` object.
|
|
\endrst
|
|
*/
|
|
basic_cstring_view(const std::basic_string<Char> &s) : data_(s.c_str()) {}
|
|
|
|
/** Returns the pointer to a C string. */
|
|
const Char *c_str() const { return data_; }
|
|
};
|
|
|
|
typedef basic_cstring_view<char> cstring_view;
|
|
typedef basic_cstring_view<wchar_t> wcstring_view;
|
|
|
|
// An error code.
|
|
class ErrorCode {
|
|
private:
|
|
int value_;
|
|
|
|
public:
|
|
explicit ErrorCode(int value = 0) FMT_NOEXCEPT : value_(value) {}
|
|
|
|
int get() const FMT_NOEXCEPT { return value_; }
|
|
};
|
|
|
|
// A buffered file.
|
|
class BufferedFile {
|
|
private:
|
|
FILE *file_;
|
|
|
|
friend class File;
|
|
|
|
explicit BufferedFile(FILE *f) : file_(f) {}
|
|
|
|
public:
|
|
// Constructs a BufferedFile object which doesn't represent any file.
|
|
BufferedFile() FMT_NOEXCEPT : file_(0) {}
|
|
|
|
// Destroys the object closing the file it represents if any.
|
|
~BufferedFile() FMT_NOEXCEPT;
|
|
|
|
#if !FMT_USE_RVALUE_REFERENCES
|
|
// Emulate a move constructor and a move assignment operator if rvalue
|
|
// references are not supported.
|
|
|
|
private:
|
|
// A proxy object to emulate a move constructor.
|
|
// It is private to make it impossible call operator Proxy directly.
|
|
struct Proxy {
|
|
FILE *file;
|
|
};
|
|
|
|
public:
|
|
// A "move constructor" for moving from a temporary.
|
|
BufferedFile(Proxy p) FMT_NOEXCEPT : file_(p.file) {}
|
|
|
|
// A "move constructor" for moving from an lvalue.
|
|
BufferedFile(BufferedFile &f) FMT_NOEXCEPT : file_(f.file_) {
|
|
f.file_ = 0;
|
|
}
|
|
|
|
// A "move assignment operator" for moving from a temporary.
|
|
BufferedFile &operator=(Proxy p) {
|
|
close();
|
|
file_ = p.file;
|
|
return *this;
|
|
}
|
|
|
|
// A "move assignment operator" for moving from an lvalue.
|
|
BufferedFile &operator=(BufferedFile &other) {
|
|
close();
|
|
file_ = other.file_;
|
|
other.file_ = 0;
|
|
return *this;
|
|
}
|
|
|
|
// Returns a proxy object for moving from a temporary:
|
|
// BufferedFile file = BufferedFile(...);
|
|
operator Proxy() FMT_NOEXCEPT {
|
|
Proxy p = {file_};
|
|
file_ = 0;
|
|
return p;
|
|
}
|
|
|
|
#else
|
|
private:
|
|
FMT_DISALLOW_COPY_AND_ASSIGN(BufferedFile);
|
|
|
|
public:
|
|
BufferedFile(BufferedFile &&other) FMT_NOEXCEPT : file_(other.file_) {
|
|
other.file_ = 0;
|
|
}
|
|
|
|
BufferedFile& operator=(BufferedFile &&other) {
|
|
close();
|
|
file_ = other.file_;
|
|
other.file_ = 0;
|
|
return *this;
|
|
}
|
|
#endif
|
|
|
|
// Opens a file.
|
|
BufferedFile(cstring_view filename, cstring_view mode);
|
|
|
|
// Closes the file.
|
|
void close();
|
|
|
|
// Returns the pointer to a FILE object representing this file.
|
|
FILE *get() const FMT_NOEXCEPT { return file_; }
|
|
|
|
// We place parentheses around fileno to workaround a bug in some versions
|
|
// of MinGW that define fileno as a macro.
|
|
int (fileno)() const;
|
|
|
|
void vprint(string_view format_str, format_args args) {
|
|
fmt::vprint(file_, format_str, args);
|
|
}
|
|
|
|
template <typename... Args>
|
|
inline void print(string_view format_str, const Args & ... args) {
|
|
vprint(format_str, make_args(args...));
|
|
}
|
|
};
|
|
|
|
// A file. Closed file is represented by a File object with descriptor -1.
|
|
// Methods that are not declared with FMT_NOEXCEPT may throw
|
|
// fmt::system_error in case of failure. Note that some errors such as
|
|
// closing the file multiple times will cause a crash on Windows rather
|
|
// than an exception. You can get standard behavior by overriding the
|
|
// invalid parameter handler with _set_invalid_parameter_handler.
|
|
class File {
|
|
private:
|
|
int fd_; // File descriptor.
|
|
|
|
// Constructs a File object with a given descriptor.
|
|
explicit File(int fd) : fd_(fd) {}
|
|
|
|
public:
|
|
// Possible values for the oflag argument to the constructor.
|
|
enum {
|
|
RDONLY = FMT_POSIX(O_RDONLY), // Open for reading only.
|
|
WRONLY = FMT_POSIX(O_WRONLY), // Open for writing only.
|
|
RDWR = FMT_POSIX(O_RDWR) // Open for reading and writing.
|
|
};
|
|
|
|
// Constructs a File object which doesn't represent any file.
|
|
File() FMT_NOEXCEPT : fd_(-1) {}
|
|
|
|
// Opens a file and constructs a File object representing this file.
|
|
File(cstring_view path, int oflag);
|
|
|
|
#if !FMT_USE_RVALUE_REFERENCES
|
|
// Emulate a move constructor and a move assignment operator if rvalue
|
|
// references are not supported.
|
|
|
|
private:
|
|
// A proxy object to emulate a move constructor.
|
|
// It is private to make it impossible call operator Proxy directly.
|
|
struct Proxy {
|
|
int fd;
|
|
};
|
|
|
|
public:
|
|
// A "move constructor" for moving from a temporary.
|
|
File(Proxy p) FMT_NOEXCEPT : fd_(p.fd) {}
|
|
|
|
// A "move constructor" for moving from an lvalue.
|
|
File(File &other) FMT_NOEXCEPT : fd_(other.fd_) {
|
|
other.fd_ = -1;
|
|
}
|
|
|
|
// A "move assignment operator" for moving from a temporary.
|
|
File &operator=(Proxy p) {
|
|
close();
|
|
fd_ = p.fd;
|
|
return *this;
|
|
}
|
|
|
|
// A "move assignment operator" for moving from an lvalue.
|
|
File &operator=(File &other) {
|
|
close();
|
|
fd_ = other.fd_;
|
|
other.fd_ = -1;
|
|
return *this;
|
|
}
|
|
|
|
// Returns a proxy object for moving from a temporary:
|
|
// File file = File(...);
|
|
operator Proxy() FMT_NOEXCEPT {
|
|
Proxy p = {fd_};
|
|
fd_ = -1;
|
|
return p;
|
|
}
|
|
|
|
#else
|
|
private:
|
|
FMT_DISALLOW_COPY_AND_ASSIGN(File);
|
|
|
|
public:
|
|
File(File &&other) FMT_NOEXCEPT : fd_(other.fd_) {
|
|
other.fd_ = -1;
|
|
}
|
|
|
|
File& operator=(File &&other) {
|
|
close();
|
|
fd_ = other.fd_;
|
|
other.fd_ = -1;
|
|
return *this;
|
|
}
|
|
#endif
|
|
|
|
// Destroys the object closing the file it represents if any.
|
|
~File() FMT_NOEXCEPT;
|
|
|
|
// Returns the file descriptor.
|
|
int descriptor() const FMT_NOEXCEPT { return fd_; }
|
|
|
|
// Closes the file.
|
|
void close();
|
|
|
|
// Returns the file size. The size has signed type for consistency with
|
|
// stat::st_size.
|
|
long long size() const;
|
|
|
|
// Attempts to read count bytes from the file into the specified buffer.
|
|
std::size_t read(void *buffer, std::size_t count);
|
|
|
|
// Attempts to write count bytes from the specified buffer to the file.
|
|
std::size_t write(const void *buffer, std::size_t count);
|
|
|
|
// Duplicates a file descriptor with the dup function and returns
|
|
// the duplicate as a file object.
|
|
static File dup(int fd);
|
|
|
|
// Makes fd be the copy of this file descriptor, closing fd first if
|
|
// necessary.
|
|
void dup2(int fd);
|
|
|
|
// Makes fd be the copy of this file descriptor, closing fd first if
|
|
// necessary.
|
|
void dup2(int fd, ErrorCode &ec) FMT_NOEXCEPT;
|
|
|
|
// Creates a pipe setting up read_end and write_end file objects for reading
|
|
// and writing respectively.
|
|
static void pipe(File &read_end, File &write_end);
|
|
|
|
// Creates a BufferedFile object associated with this file and detaches
|
|
// this File object from the file.
|
|
BufferedFile fdopen(const char *mode);
|
|
};
|
|
|
|
// Returns the memory page size.
|
|
long getpagesize();
|
|
|
|
#if (defined(LC_NUMERIC_MASK) || defined(_MSC_VER)) && !defined(__ANDROID__)
|
|
# define FMT_LOCALE
|
|
#endif
|
|
|
|
#ifdef FMT_LOCALE
|
|
// A "C" numeric locale.
|
|
class Locale {
|
|
private:
|
|
# ifdef _MSC_VER
|
|
typedef _locale_t locale_t;
|
|
|
|
enum { LC_NUMERIC_MASK = LC_NUMERIC };
|
|
|
|
static locale_t newlocale(int category_mask, const char *locale, locale_t) {
|
|
return _create_locale(category_mask, locale);
|
|
}
|
|
|
|
static void freelocale(locale_t locale) {
|
|
_free_locale(locale);
|
|
}
|
|
|
|
static double strtod_l(const char *nptr, char **endptr, _locale_t locale) {
|
|
return _strtod_l(nptr, endptr, locale);
|
|
}
|
|
# endif
|
|
|
|
locale_t locale_;
|
|
|
|
FMT_DISALLOW_COPY_AND_ASSIGN(Locale);
|
|
|
|
public:
|
|
typedef locale_t Type;
|
|
|
|
Locale() : locale_(newlocale(LC_NUMERIC_MASK, "C", NULL)) {
|
|
if (!locale_)
|
|
throw fmt::system_error(errno, "cannot create locale");
|
|
}
|
|
~Locale() { freelocale(locale_); }
|
|
|
|
Type get() const { return locale_; }
|
|
|
|
// Converts string to floating-point number and advances str past the end
|
|
// of the parsed input.
|
|
double strtod(const char *&str) const {
|
|
char *end = 0;
|
|
double result = strtod_l(str, &end, locale_);
|
|
str = end;
|
|
return result;
|
|
}
|
|
};
|
|
#endif // FMT_LOCALE
|
|
} // namespace fmt
|
|
|
|
#if !FMT_USE_RVALUE_REFERENCES
|
|
namespace std {
|
|
// For compatibility with C++98.
|
|
inline fmt::BufferedFile &move(fmt::BufferedFile &f) { return f; }
|
|
inline fmt::File &move(fmt::File &f) { return f; }
|
|
}
|
|
#endif
|
|
|
|
#endif // FMT_POSIX_H_
|