95 lines
2.3 KiB
C++
95 lines
2.3 KiB
C++
// This file Copyright © 2013-2022 Mnemosyne LLC.
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// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
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// or any future license endorsed by Mnemosyne LLC.
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// License text can be found in the licenses/ folder.
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#include <algorithm>
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#include <string_view>
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#include "transmission.h"
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#include "error.h"
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#include "file.h"
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#include "tr-assert.h"
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using namespace std::literals;
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bool tr_sys_file_read_line(tr_sys_file_t handle, char* buffer, size_t buffer_size, tr_error** error)
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{
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TR_ASSERT(handle != TR_BAD_SYS_FILE);
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TR_ASSERT(buffer != nullptr);
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TR_ASSERT(buffer_size > 0);
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auto ret = bool{};
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auto offset = size_t{};
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while (buffer_size > 0)
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{
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size_t const bytes_needed = std::min(buffer_size, size_t{ 1024 });
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auto bytes_read = uint64_t{};
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ret = tr_sys_file_read(handle, buffer + offset, bytes_needed, &bytes_read, error);
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if (!ret || (offset == 0 && bytes_read == 0))
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{
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ret = false;
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break;
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}
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TR_ASSERT(bytes_read <= bytes_needed);
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TR_ASSERT(bytes_read <= buffer_size);
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int64_t delta = 0;
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for (size_t i = 0; i < bytes_read; ++i)
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{
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if (buffer[offset] == '\n')
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{
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delta = i - (int64_t)bytes_read + 1;
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break;
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}
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++offset;
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--buffer_size;
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}
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if (delta != 0 || buffer_size == 0 || bytes_read == 0)
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{
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if (delta != 0)
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{
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ret = tr_sys_file_seek(handle, delta, TR_SEEK_CUR, nullptr, error);
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if (!ret)
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{
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break;
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}
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}
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if (offset > 0 && buffer[offset - 1] == '\r')
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{
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buffer[offset - 1] = '\0';
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}
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else
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{
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buffer[offset] = '\0';
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}
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break;
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}
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}
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return ret;
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}
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bool tr_sys_file_write_line(tr_sys_file_t handle, std::string_view buffer, tr_error** error)
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{
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TR_ASSERT(handle != TR_BAD_SYS_FILE);
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bool ret = tr_sys_file_write(handle, std::data(buffer), std::size(buffer), nullptr, error);
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if (ret)
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{
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ret = tr_sys_file_write(handle, TR_NATIVE_EOL_STR, TR_NATIVE_EOL_STR_SIZE, nullptr, error);
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}
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return ret;
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}
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