forked from OctaForge/libostd
197 lines
4.3 KiB
C++
197 lines
4.3 KiB
C++
/* Standard I/O implementation for OctaSTD.
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*
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* This file is part of OctaSTD. See COPYING.md for futher information.
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*/
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#ifndef OSTD_IO_HH
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#define OSTD_IO_HH
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#include <stdio.h>
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#include "ostd/platform.hh"
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#include "ostd/string.hh"
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#include "ostd/stream.hh"
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#include "ostd/format.hh"
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namespace ostd {
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enum class StreamMode {
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read, write, append,
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update = 1 << 2
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};
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namespace detail {
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static const char *filemodes[] = {
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"rb", "wb", "ab", nullptr, "rb+", "wb+", "ab+"
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};
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}
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struct FileStream: Stream {
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FileStream(): p_f(), p_owned(false) {}
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FileStream(const FileStream &) = delete;
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FileStream(FileStream &&s): p_f(s.p_f), p_owned(s.p_owned) {
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s.p_f = nullptr;
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s.p_owned = false;
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}
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FileStream(ConstCharRange path, StreamMode mode): p_f() {
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open(path, mode);
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}
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FileStream(FILE *f): p_f(f), p_owned(false) {}
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~FileStream() { close(); }
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FileStream &operator=(const FileStream &) = delete;
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FileStream &operator=(FileStream &&s) {
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close();
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swap(s);
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return *this;
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}
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bool open(ConstCharRange path, StreamMode mode) {
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if (p_f || path.size() > FILENAME_MAX) return false;
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char buf[FILENAME_MAX + 1];
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memcpy(buf, &path[0], path.size());
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buf[path.size()] = '\0';
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p_f = fopen(buf, detail::filemodes[Size(mode)]);
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p_owned = true;
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return is_open();
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}
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bool open(FILE *f) {
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if (p_f) return false;
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p_f = f;
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p_owned = false;
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return is_open();
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}
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bool is_open() const { return p_f != nullptr; }
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bool is_owned() const { return p_owned; }
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void close() {
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if (p_f && p_owned) fclose(p_f);
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p_f = nullptr;
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p_owned = false;
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}
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bool end() const {
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return feof(p_f) != 0;
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}
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bool seek(StreamOffset pos, StreamSeek whence = StreamSeek::set) {
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#ifndef OSTD_PLATFORM_WIN32
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return fseeko(p_f, pos, int(whence)) >= 0;
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#else
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return _fseeki64(p_f, pos, int(whence)) >= 0;
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#endif
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}
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StreamOffset tell() const {
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#ifndef OSTD_PLATFORM_WIN32
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return ftello(p_f);
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#else
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return _ftelli64(p_f);
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#endif
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}
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bool flush() { return !fflush(p_f); }
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Size read_bytes(void *buf, Size count) {
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return fread(buf, 1, count, p_f);
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}
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Size write_bytes(const void *buf, Size count) {
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return fwrite(buf, 1, count, p_f);
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}
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int getchar() {
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return fgetc(p_f);
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}
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bool putchar(int c) {
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return fputc(c, p_f) != EOF;
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}
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void swap(FileStream &s) {
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ostd::swap(p_f, s.p_f);
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ostd::swap(p_owned, s.p_owned);
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}
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FILE *get_file() { return p_f; }
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private:
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FILE *p_f;
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bool p_owned;
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};
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static FileStream in(::stdin);
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static FileStream out(::stdout);
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static FileStream err(::stderr);
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/* no need to call anything from FileStream, prefer simple calls... */
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namespace detail {
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struct IoNat {};
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inline void write_impl(ConstCharRange s) {
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fwrite(&s[0], 1, s.size(), ::stdout);
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}
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template<typename T>
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inline void write_impl(const T &v, EnableIf<
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!IsConstructible<ConstCharRange, const T &>::value, IoNat
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> = IoNat()) {
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write(ostd::to_string(v));
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}
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}
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template<typename T>
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inline void write(const T &v) {
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detail::write_impl(v);
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}
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template<typename T, typename ...A>
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inline void write(const T &v, const A &...args) {
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write(v);
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write(args...);
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}
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template<typename T>
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inline void writeln(const T &v) {
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write(v);
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putc('\n', ::stdout);
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}
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template<typename T, typename ...A>
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inline void writeln(const T &v, const A &...args) {
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write(v);
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write(args...);
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putc('\n', ::stdout);
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}
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template<typename ...A>
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inline void writef(ConstCharRange fmt, const A &...args) {
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char buf[512];
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Ptrdiff need = format(detail::FormatOutRange<sizeof(buf)>(buf),
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fmt, args...);
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if (need < 0) return;
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else if (Size(need) < sizeof(buf)) {
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fwrite(buf, 1, need, ::stdout);
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return;
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}
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Vector<char> s;
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s.reserve(need);
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format(detail::UnsafeWritefRange(s.data()), fmt, args...);
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fwrite(s.data(), 1, need, ::stdout);
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}
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template<typename ...A>
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inline void writefln(ConstCharRange fmt, const A &...args) {
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writef(fmt, args...);
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putc('\n', ::stdout);
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}
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} /* namespace ostd */
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#endif |