mirror of https://github.com/tstack/lnav
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
61 lines
1.1 KiB
C++
61 lines
1.1 KiB
C++
|
|
#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;
|
|
char *line;
|
|
size_t len;
|
|
|
|
lb.set_fd(fd);
|
|
index.push_back(offset);
|
|
while ((line = lb.read_line(offset, len)) != NULL) {
|
|
index.push_back(offset);
|
|
}
|
|
index.pop_back();
|
|
|
|
try {
|
|
while (scanf("%d:%d:%d", &line_number, &start, &end) == 3) {
|
|
string str;
|
|
|
|
offset = index[line_number];
|
|
line = lb.read_line(offset, len);
|
|
str = string(line, 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;
|
|
}
|