78 lines
1.8 KiB
C++
78 lines
1.8 KiB
C++
//
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// fdiobuf.cpp
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// libscio
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//
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// Created by Bob Polis at 2020-02-14
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// Copyright (c) 2020 SwiftCoder. All rights reserved.
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//
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#include "libscio.hpp"
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#ifdef _MSC_VER
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#include <io.h>
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#else
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#include <unistd.h>
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#endif
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std::streambuf::int_type sc::io::fdiobuf::underflow() {
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int num = ::read(_fd, &_ch, 1);
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if (num <= 0) {
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return EOF;
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}
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setg(&_ch, &_ch, &_ch + 1);
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return _ch;
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}
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std::streamsize sc::io::fdiobuf::xsgetn(char* s, std::streamsize n) {
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return ::read(_fd, s, n);
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}
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std::streambuf::int_type sc::io::fdiobuf::overflow(std::streambuf::int_type c) {
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if (c != EOF) {
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int res;
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if ((res = ::write(_fd, &c, 1)) != 1) {
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return EOF;
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}
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else {
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std::cerr << "write result = " << res << ", errno = " << errno << '\n';
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}
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}
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_ch = c;
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setp(&_ch, &_ch + 1);
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return c;
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}
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std::streamsize sc::io::fdiobuf::xsputn(const char* s, std::streamsize num) {
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int res = ::write(_fd, s, num);
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if (res != num) {
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std::cerr << "write result = " << res << ", errno = " << errno << '\n';
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return EOF;
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}
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return res;
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}
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std::streambuf::pos_type sc::io::fdiobuf::seekoff(std::streambuf::off_type off,
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std::ios_base::seekdir dir,
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std::ios_base::openmode /*which*/) {
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int whence;
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switch (dir) {
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case std::ios_base::beg: whence = SEEK_SET; break;
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case std::ios_base::end: whence = SEEK_END; break;
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case std::ios_base::cur: whence = SEEK_CUR; break;
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default: throw std::runtime_error("invalid seekdir");
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}
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return ::lseek(_fd, off, whence);
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}
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std::streambuf::pos_type sc::io::fdiobuf::seekpos(std::streambuf::pos_type pos,
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std::ios_base::openmode /*which*/) {
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return ::lseek(_fd, pos, SEEK_SET);
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}
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std::streambuf::int_type sc::io::fdiobuf::pbackfail(std::streambuf::int_type /*c*/) {
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if (::lseek(_fd, -1, SEEK_CUR) == -1) {
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return EOF;
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}
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return 0;
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}
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