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https://github.com/wpilibsuite/allwpilib
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f84018af5f
During shared library loading, a different libLLVM can be pulled in, causing llvm symbols from dependent libraries to resolve to that library instead of this one. This has been seen in the wild with the Mesa OpenGL implementation in JavaFX applications (see wpilibsuite/shuffleboard#361). This is clearly a very breaking change. For some level of backwards compatibility, a namespace alias from llvm to wpi is performed in the "llvm" headers. Unfortunately, forward declarations of llvm classes will still break, but compilers seem to generate clear error messages in those cases ("namespace alias 'llvm' not allowed here, assuming 'wpi'"). This change also moves all the wpiutil headers to a single "wpi" subdirectory from the previously split "llvm", "support", "tcpsockets", and "udpsockets". Shim headers will be added for backwards compatibility in a later commit.
116 lines
2.9 KiB
C++
116 lines
2.9 KiB
C++
/*----------------------------------------------------------------------------*/
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/* Copyright (c) 2015-2018 FIRST. All Rights Reserved. */
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/* Open Source Software - may be modified and shared by FRC teams. The code */
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/* must be accompanied by the FIRST BSD license file in the root directory of */
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/* the project. */
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/*----------------------------------------------------------------------------*/
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#ifndef WPIUTIL_SUPPORT_RAW_ISTREAM_H_
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#define WPIUTIL_SUPPORT_RAW_ISTREAM_H_
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#include <algorithm>
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#include <cstddef>
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#include <system_error>
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#include "wpi/SmallVector.h"
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#include "wpi/StringRef.h"
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#include "wpi/Twine.h"
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namespace wpi {
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class raw_istream {
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public:
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raw_istream() = default;
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virtual ~raw_istream() = default;
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raw_istream& read(char& c) {
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read_impl(&c, 1);
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return *this;
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}
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raw_istream& read(unsigned char& c) {
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read_impl(&c, 1);
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return *this;
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}
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raw_istream& read(signed char& c) {
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read_impl(&c, 1);
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return *this;
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}
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raw_istream& read(void* data, size_t len) {
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read_impl(data, len);
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return *this;
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}
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size_t readsome(void* data, size_t len) {
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size_t readlen = std::min(in_avail(), len);
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if (readlen == 0) return 0;
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read_impl(data, readlen);
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return readlen;
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}
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// Read a line from an input stream (up to a maximum length).
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// The returned buffer will contain the trailing \n (unless the maximum length
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// was reached). \r's are stripped from the buffer.
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// @param buf Buffer for output
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// @param maxLen Maximum length
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// @return Line
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StringRef getline(SmallVectorImpl<char>& buf, int maxLen);
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virtual void close() = 0;
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virtual size_t in_avail() const = 0;
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bool has_error() const { return m_error; }
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void clear_error() { m_error = false; }
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raw_istream(const raw_istream&) = delete;
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raw_istream& operator=(const raw_istream&) = delete;
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protected:
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void error_detected() { m_error = true; }
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private:
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virtual void read_impl(void* data, size_t len) = 0;
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bool m_error = false;
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};
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class raw_mem_istream : public raw_istream {
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public:
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explicit raw_mem_istream(StringRef mem);
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raw_mem_istream(const char* mem, size_t len) : m_cur(mem), m_left(len) {}
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void close() override;
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size_t in_avail() const override;
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private:
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void read_impl(void* data, size_t len) override;
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const char* m_cur;
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size_t m_left;
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};
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class raw_fd_istream : public raw_istream {
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public:
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raw_fd_istream(const Twine& filename, std::error_code& ec,
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size_t bufSize = 4096);
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raw_fd_istream(int fd, bool shouldClose, size_t bufSize = 4096);
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~raw_fd_istream() override;
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void close() override;
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size_t in_avail() const override;
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private:
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void read_impl(void* data, size_t len) override;
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char* m_buf;
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char* m_cur;
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char* m_end;
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size_t m_bufSize;
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int m_fd;
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bool m_shouldClose;
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};
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} // namespace wpi
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#endif // WPIUTIL_SUPPORT_RAW_ISTREAM_H_
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