241 lines
6.7 KiB
C++
241 lines
6.7 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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// Disable bogus MSVC warnings.
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#ifndef _CRT_SECURE_NO_WARNINGS
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# define _CRT_SECURE_NO_WARNINGS
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#endif
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#include "posix.h"
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#include <limits.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#ifndef _WIN32
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# include <unistd.h>
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#else
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# ifndef WIN32_LEAN_AND_MEAN
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# define WIN32_LEAN_AND_MEAN
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# endif
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# include <windows.h>
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# include <io.h>
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# define O_CREAT _O_CREAT
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# define O_TRUNC _O_TRUNC
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# ifndef S_IRUSR
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# define S_IRUSR _S_IREAD
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# endif
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# ifndef S_IWUSR
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# define S_IWUSR _S_IWRITE
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# endif
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# ifdef __MINGW32__
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# define _SH_DENYNO 0x40
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# endif
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#endif // _WIN32
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#ifdef fileno
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# undef fileno
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#endif
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namespace {
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#ifdef _WIN32
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// Return type of read and write functions.
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typedef int RWResult;
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// On Windows the count argument to read and write is unsigned, so convert
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// it from size_t preventing integer overflow.
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inline unsigned convert_rwcount(std::size_t count) {
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return count <= UINT_MAX ? static_cast<unsigned>(count) : UINT_MAX;
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}
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#else
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// Return type of read and write functions.
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typedef ssize_t RWResult;
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inline std::size_t convert_rwcount(std::size_t count) { return count; }
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#endif
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}
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fmt::BufferedFile::~BufferedFile() FMT_NOEXCEPT {
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if (file_ && FMT_SYSTEM(fclose(file_)) != 0)
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fmt::report_system_error(errno, "cannot close file");
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}
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fmt::BufferedFile::BufferedFile(
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fmt::cstring_view filename, fmt::cstring_view mode) {
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FMT_RETRY_VAL(file_, FMT_SYSTEM(fopen(filename.c_str(), mode.c_str())), FMT_NULL);
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if (!file_)
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FMT_THROW(system_error(errno, "cannot open file {}", filename.c_str()));
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}
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void fmt::BufferedFile::close() {
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if (!file_)
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return;
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int result = FMT_SYSTEM(fclose(file_));
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file_ = FMT_NULL;
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if (result != 0)
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FMT_THROW(system_error(errno, "cannot close file"));
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}
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// A macro used to prevent expansion of fileno on broken versions of MinGW.
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#define FMT_ARGS
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int fmt::BufferedFile::fileno() const {
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int fd = FMT_POSIX_CALL(fileno FMT_ARGS(file_));
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if (fd == -1)
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FMT_THROW(system_error(errno, "cannot get file descriptor"));
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return fd;
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}
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fmt::File::File(fmt::cstring_view path, int oflag) {
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int mode = S_IRUSR | S_IWUSR;
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#if defined(_WIN32) && !defined(__MINGW32__)
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fd_ = -1;
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FMT_POSIX_CALL(sopen_s(&fd_, path.c_str(), oflag, _SH_DENYNO, mode));
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#else
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FMT_RETRY(fd_, FMT_POSIX_CALL(open(path.c_str(), oflag, mode)));
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#endif
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if (fd_ == -1)
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FMT_THROW(system_error(errno, "cannot open file {}", path.c_str()));
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}
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fmt::File::~File() FMT_NOEXCEPT {
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// Don't retry close in case of EINTR!
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// See http://linux.derkeiler.com/Mailing-Lists/Kernel/2005-09/3000.html
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if (fd_ != -1 && FMT_POSIX_CALL(close(fd_)) != 0)
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fmt::report_system_error(errno, "cannot close file");
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}
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void fmt::File::close() {
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if (fd_ == -1)
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return;
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// Don't retry close in case of EINTR!
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// See http://linux.derkeiler.com/Mailing-Lists/Kernel/2005-09/3000.html
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int result = FMT_POSIX_CALL(close(fd_));
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fd_ = -1;
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if (result != 0)
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FMT_THROW(system_error(errno, "cannot close file"));
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}
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long long fmt::File::size() const {
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#ifdef _WIN32
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// Use GetFileSize instead of GetFileSizeEx for the case when _WIN32_WINNT
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// is less than 0x0500 as is the case with some default MinGW builds.
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// Both functions support large file sizes.
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DWORD size_upper = 0;
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HANDLE handle = reinterpret_cast<HANDLE>(_get_osfhandle(fd_));
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DWORD size_lower = FMT_SYSTEM(GetFileSize(handle, &size_upper));
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if (size_lower == INVALID_FILE_SIZE) {
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DWORD error = GetLastError();
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if (error != NO_ERROR)
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FMT_THROW(windows_error(GetLastError(), "cannot get file size"));
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}
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unsigned long long long_size = size_upper;
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return (long_size << sizeof(DWORD) * CHAR_BIT) | size_lower;
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#else
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typedef struct stat Stat;
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Stat file_stat = Stat();
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if (FMT_POSIX_CALL(fstat(fd_, &file_stat)) == -1)
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FMT_THROW(system_error(errno, "cannot get file attributes"));
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static_assert(sizeof(long long) >= sizeof(file_stat.st_size),
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"return type of File::size is not large enough");
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return file_stat.st_size;
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#endif
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}
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std::size_t fmt::File::read(void *buffer, std::size_t count) {
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RWResult result = 0;
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FMT_RETRY(result, FMT_POSIX_CALL(read(fd_, buffer, convert_rwcount(count))));
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if (result < 0)
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FMT_THROW(system_error(errno, "cannot read from file"));
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return internal::to_unsigned(result);
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}
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std::size_t fmt::File::write(const void *buffer, std::size_t count) {
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RWResult result = 0;
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FMT_RETRY(result, FMT_POSIX_CALL(write(fd_, buffer, convert_rwcount(count))));
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if (result < 0)
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FMT_THROW(system_error(errno, "cannot write to file"));
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return internal::to_unsigned(result);
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}
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fmt::File fmt::File::dup(int fd) {
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// Don't retry as dup doesn't return EINTR.
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// http://pubs.opengroup.org/onlinepubs/009695399/functions/dup.html
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int new_fd = FMT_POSIX_CALL(dup(fd));
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if (new_fd == -1)
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FMT_THROW(system_error(errno, "cannot duplicate file descriptor {}", fd));
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return File(new_fd);
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}
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void fmt::File::dup2(int fd) {
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int result = 0;
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FMT_RETRY(result, FMT_POSIX_CALL(dup2(fd_, fd)));
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if (result == -1) {
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FMT_THROW(system_error(errno,
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"cannot duplicate file descriptor {} to {}", fd_, fd));
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}
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}
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void fmt::File::dup2(int fd, ErrorCode &ec) FMT_NOEXCEPT {
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int result = 0;
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FMT_RETRY(result, FMT_POSIX_CALL(dup2(fd_, fd)));
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if (result == -1)
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ec = ErrorCode(errno);
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}
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void fmt::File::pipe(File &read_end, File &write_end) {
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// Close the descriptors first to make sure that assignments don't throw
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// and there are no leaks.
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read_end.close();
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write_end.close();
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int fds[2] = {};
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#ifdef _WIN32
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// Make the default pipe capacity same as on Linux 2.6.11+.
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enum { DEFAULT_CAPACITY = 65536 };
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int result = FMT_POSIX_CALL(pipe(fds, DEFAULT_CAPACITY, _O_BINARY));
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#else
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// Don't retry as the pipe function doesn't return EINTR.
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// http://pubs.opengroup.org/onlinepubs/009696799/functions/pipe.html
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int result = FMT_POSIX_CALL(pipe(fds));
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#endif
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if (result != 0)
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FMT_THROW(system_error(errno, "cannot create pipe"));
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// The following assignments don't throw because read_fd and write_fd
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// are closed.
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read_end = File(fds[0]);
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write_end = File(fds[1]);
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}
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fmt::BufferedFile fmt::File::fdopen(const char *mode) {
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// Don't retry as fdopen doesn't return EINTR.
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FILE *f = FMT_POSIX_CALL(fdopen(fd_, mode));
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if (!f)
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FMT_THROW(system_error(errno,
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"cannot associate stream with file descriptor"));
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BufferedFile file(f);
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fd_ = -1;
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return file;
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}
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long fmt::getpagesize() {
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#ifdef _WIN32
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SYSTEM_INFO si;
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GetSystemInfo(&si);
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return si.dwPageSize;
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#else
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long size = FMT_POSIX_CALL(sysconf(_SC_PAGESIZE));
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if (size < 0)
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FMT_THROW(system_error(errno, "cannot get memory page size"));
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return size;
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#endif
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}
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