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https://github.com/tstack/lnav.git
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129 lines
2.3 KiB
C++
129 lines
2.3 KiB
C++
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#include "config.h"
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "grep_proc.hh"
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#include "line_buffer.hh"
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using namespace std;
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class my_source : public grep_proc_source {
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public:
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my_source(auto_fd &fd) : ms_offset(0) {
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this->ms_buffer.set_fd(fd);
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};
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bool grep_value_for_line(int line_number, string &value_out) {
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bool retval = false;
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try {
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size_t len;
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char *line;
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if ((line = this->ms_buffer.read_line(this->ms_offset,
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len)) != NULL) {
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value_out = string(line, len);
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retval = true;
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}
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}
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catch (line_buffer::error &e) {
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fprintf(stderr,
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"error: source buffer error %d %s\n",
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this->ms_buffer.get_fd(),
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strerror(e.e_err));
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}
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return retval;
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};
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private:
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line_buffer ms_buffer;
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off_t ms_offset;
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};
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class my_sink : public grep_proc_sink {
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public:
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my_sink() : ms_finished(false) { };
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void grep_match(grep_proc &gp,
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grep_line_t line,
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int start,
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int end) {
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printf("%d:%d:%d\n", (int)line, start, end);
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};
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void grep_capture(grep_proc &gp,
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grep_line_t line,
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int start,
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int end,
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char *capture) {
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fprintf(stderr, "%d(%d:%d)%s\n", (int)line, start, end, capture);
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};
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void grep_end(grep_proc &gp) {
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this->ms_finished = true;
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};
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bool ms_finished;
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};
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int main(int argc, char *argv[])
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{
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int retval = EXIT_SUCCESS;
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const char *errptr;
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auto_fd fd;
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pcre *code;
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int eoff;
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if (argc < 3) {
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fprintf(stderr, "error: expecting pattern and file arguments\n");
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retval = EXIT_FAILURE;
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}
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else if ((fd = open(argv[2], O_RDONLY)) == -1) {
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perror("open");
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retval = EXIT_FAILURE;
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}
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else if ((code = pcre_compile(argv[1],
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PCRE_CASELESS,
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&errptr,
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&eoff,
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NULL)) == NULL) {
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fprintf(stderr, "error: invalid pattern -- %s\n", errptr);
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}
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else {
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my_source ms(fd);
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fd_set read_fds;
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my_sink msink;
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int maxfd;
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FD_ZERO(&read_fds);
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grep_proc gp(code, ms, maxfd, read_fds);
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gp.queue_request();
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gp.start();
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gp.set_sink(&msink);
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while (!msink.ms_finished) {
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fd_set rfds = read_fds;
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select(maxfd + 1, &rfds, NULL, NULL, NULL);
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gp.check_fd_set(rfds);
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}
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}
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return retval;
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}
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