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+/*
+ 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_
+
+#if defined(__MINGW32__) || defined(__CYGWIN__)
+// 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 "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 {
+
+// 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_(FMT_NULL) {}
+
+ // Destroys the object closing the file it represents if any.
+ FMT_API ~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_ = FMT_NULL;
+ }
+
+ // 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_ = FMT_NULL;
+ return *this;
+ }
+
+ // Returns a proxy object for moving from a temporary:
+ // BufferedFile file = BufferedFile(...);
+ operator Proxy() FMT_NOEXCEPT
+ {
+ Proxy p = {file_};
+ file_ = FMT_NULL;
+ return p;
+ }
+
+#else
+private:
+ FMT_DISALLOW_COPY_AND_ASSIGN(BufferedFile);
+
+public:
+ BufferedFile(BufferedFile &&other) FMT_NOEXCEPT : file_(other.file_)
+ {
+ other.file_ = FMT_NULL;
+ }
+
+ BufferedFile &operator=(BufferedFile &&other)
+ {
+ close();
+ file_ = other.file_;
+ other.file_ = FMT_NULL;
+ return *this;
+ }
+#endif
+
+ // Opens a file.
+ FMT_API BufferedFile(CStringRef filename, CStringRef mode);
+
+ // Closes the file.
+ FMT_API 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.
+ FMT_API int(fileno)() const;
+
+ void print(CStringRef format_str, const ArgList &args)
+ {
+ fmt::print(file_, format_str, args);
+ }
+ FMT_VARIADIC(void, print, CStringRef)
+};
+
+// A file. Closed file is represented by a File object with descriptor -1.
+// Methods that are not declared with FMT_NOEXCEPT may throw
+// fmt::SystemError 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.
+ FMT_API File(CStringRef 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.
+ FMT_API ~File() FMT_NOEXCEPT;
+
+ // Returns the file descriptor.
+ int descriptor() const FMT_NOEXCEPT
+ {
+ return fd_;
+ }
+
+ // Closes the file.
+ FMT_API void close();
+
+ // Returns the file size. The size has signed type for consistency with
+ // stat::st_size.
+ FMT_API LongLong size() const;
+
+ // Attempts to read count bytes from the file into the specified buffer.
+ FMT_API std::size_t read(void *buffer, std::size_t count);
+
+ // Attempts to write count bytes from the specified buffer to the file.
+ FMT_API 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.
+ FMT_API static File dup(int fd);
+
+ // Makes fd be the copy of this file descriptor, closing fd first if
+ // necessary.
+ FMT_API void dup2(int fd);
+
+ // Makes fd be the copy of this file descriptor, closing fd first if
+ // necessary.
+ FMT_API 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.
+ FMT_API 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.
+ FMT_API BufferedFile fdopen(const char *mode);
+};
+
+// Returns the memory page size.
+long getpagesize();
+
+#if (defined(LC_NUMERIC_MASK) || defined(_MSC_VER)) && !defined(__ANDROID__) && !defined(__CYGWIN__)
+#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", FMT_NULL))
+ {
+ if (!locale_)
+ FMT_THROW(fmt::SystemError(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 = FMT_NULL;
+ 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;
+}
+} // namespace std
+#endif
+
+#endif // FMT_POSIX_H_