mirror of
https://github.com/tstack/lnav
synced 2024-11-11 13:10:36 +00:00
88 lines
2.6 KiB
C++
88 lines
2.6 KiB
C++
/**
|
|
* Copyright (c) 2007-2012, Timothy Stack
|
|
*
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* * Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
* * Neither the name of Timothy Stack nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
|
|
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
|
|
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
|
|
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
|
|
#include <string>
|
|
#include <vector>
|
|
|
|
#include "line_buffer.hh"
|
|
|
|
using namespace std;
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
int retval = EXIT_SUCCESS;
|
|
vector<off_t> index;
|
|
auto_fd fd;
|
|
|
|
if (argc < 2) {
|
|
fprintf(stderr, "error: expecting file argument\n");
|
|
retval = EXIT_FAILURE;
|
|
}
|
|
else if ((fd = open(argv[1], O_RDONLY)) == -1) {
|
|
perror("open");
|
|
retval = EXIT_FAILURE;
|
|
}
|
|
else {
|
|
int line_number, start, end;
|
|
off_t offset = 0;
|
|
line_buffer lb;
|
|
line_value lv;
|
|
|
|
lb.set_fd(fd);
|
|
index.push_back(offset);
|
|
while (lb.read_line(offset, lv)) {
|
|
index.push_back(offset);
|
|
}
|
|
index.pop_back();
|
|
|
|
try {
|
|
while (scanf("%d:%d:%d", &line_number, &start, &end) == 3) {
|
|
string str;
|
|
|
|
offset = index[line_number];
|
|
lb.read_line(offset, lv);
|
|
str = string(lv.lv_start, lv.lv_len);
|
|
str = str.substr(start, end);
|
|
printf("%s\n", str.c_str());
|
|
}
|
|
}
|
|
catch (line_buffer::error &e) {
|
|
fprintf(stderr, "error: line buffer %s\n", strerror(e.e_err));
|
|
}
|
|
}
|
|
|
|
return retval;
|
|
}
|