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91 lines
2.2 KiB
C++
91 lines
2.2 KiB
C++
// Formatting library for C++ - custom Google Test assertions
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//
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// Copyright (c) 2012 - present, 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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#include "gtest-extra.h"
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#if FMT_USE_FILE_DESCRIPTORS
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using fmt::file;
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void OutputRedirect::flush() {
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#if EOF != -1
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# error "FMT_RETRY assumes return value of -1 indicating failure"
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#endif
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int result = 0;
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FMT_RETRY(result, fflush(file_));
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if (result != 0)
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throw fmt::system_error(errno, "cannot flush stream");
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}
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void OutputRedirect::restore() {
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if (original_.descriptor() == -1)
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return; // Already restored.
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flush();
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// Restore the original file.
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original_.dup2(FMT_POSIX(fileno(file_)));
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original_.close();
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}
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OutputRedirect::OutputRedirect(FILE *f) : file_(f) {
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flush();
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int fd = FMT_POSIX(fileno(f));
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// Create a file object referring to the original file.
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original_ = file::dup(fd);
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// Create a pipe.
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file write_end;
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file::pipe(read_end_, write_end);
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// Connect the passed FILE object to the write end of the pipe.
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write_end.dup2(fd);
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}
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OutputRedirect::~OutputRedirect() FMT_NOEXCEPT {
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try {
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restore();
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} catch (const std::exception &e) {
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std::fputs(e.what(), stderr);
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}
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}
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std::string OutputRedirect::restore_and_read() {
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// Restore output.
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restore();
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// Read everything from the pipe.
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std::string content;
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if (read_end_.descriptor() == -1)
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return content; // Already read.
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enum { BUFFER_SIZE = 4096 };
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char buffer[BUFFER_SIZE];
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std::size_t count = 0;
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do {
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count = read_end_.read(buffer, BUFFER_SIZE);
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content.append(buffer, count);
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} while (count != 0);
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read_end_.close();
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return content;
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}
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std::string read(file &f, std::size_t count) {
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std::string buffer(count, '\0');
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std::size_t n = 0, offset = 0;
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do {
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n = f.read(&buffer[offset], count - offset);
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// We can't read more than size_t bytes since count has type size_t.
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offset += static_cast<std::size_t>(n);
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} while (offset < count && n != 0);
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buffer.resize(offset);
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return buffer;
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}
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#endif // FMT_USE_FILE_DESCRIPTORS
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std::string format_system_error(int error_code, fmt::string_view message) {
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fmt::memory_buffer out;
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format_system_error(out, error_code, message);
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return to_string(out);
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}
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