mirror of https://github.com/tstack/lnav.git
100 lines
3.1 KiB
C++
100 lines
3.1 KiB
C++
/**
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* Copyright (c) 2007-2012, Timothy Stack
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of Timothy Stack nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <string>
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#include <vector>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "line_buffer.hh"
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using namespace std;
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int
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main(int argc, char* argv[])
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{
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int retval = EXIT_SUCCESS;
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vector<file_range> index;
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auto_fd fd;
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if (argc < 2) {
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fprintf(stderr, "error: expecting file argument\n");
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retval = EXIT_FAILURE;
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} else if ((fd = open(argv[1], O_RDONLY)) == -1) {
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perror("open");
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retval = EXIT_FAILURE;
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} else {
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int line_number, start, end;
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line_buffer lb;
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file_range range;
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lb.set_fd(fd);
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while (true) {
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auto load_result = lb.load_next_line(range);
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if (load_result.isErr()) {
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return EXIT_FAILURE;
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}
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auto li = load_result.unwrap();
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if (li.li_file_range.empty()) {
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break;
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}
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index.emplace_back(li.li_file_range);
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range = li.li_file_range;
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}
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try {
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while (scanf("%d:%d:%d", &line_number, &start, &end) == 3) {
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range = index[line_number];
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auto read_result = lb.read_range(range);
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if (read_result.isErr()) {
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return EXIT_FAILURE;
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}
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auto str = to_string(read_result.unwrap());
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str = str.substr(start, end - start);
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printf("%s\n", str.c_str());
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}
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} catch (line_buffer::error& e) {
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fprintf(stderr, "error: line buffer %s\n", strerror(e.e_err));
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}
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}
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return retval;
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}
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