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