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/* Copyright (C) 2021 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <unistd.h>
#include "libknot/yparser/yparser.h"
#include "libknot/attribute.h"
#include "libknot/errcode.h"
extern int _yp_start_state;
extern int _yp_parse(yp_parser_t *parser);
_public_
void yp_init(
yp_parser_t *parser)
{
if (parser == NULL) {
return;
}
memset(parser, 0, sizeof(*parser));
parser->cs = _yp_start_state;
parser->file.descriptor = -1;
parser->line_count = 1;
}
_public_
void yp_deinit(
yp_parser_t *parser)
{
if (parser == NULL) {
return;
}
if (parser->file.descriptor != -1) {
munmap((void *)parser->input.start,
parser->input.end - parser->input.start);
close(parser->file.descriptor);
free(parser->file.name);
}
}
_public_
int yp_set_input_string(
yp_parser_t *parser,
const char *input,
size_t size)
{
if (parser == NULL || input == NULL) {
return KNOT_EINVAL;
}
// Reinitialize the parser.
yp_deinit(parser);
yp_init(parser);
// Set the parser input limits.
parser->input.start = input;
parser->input.current = input;
parser->input.end = input + size;
parser->input.eof = false;
return KNOT_EOK;
}
_public_
int yp_set_input_file(
yp_parser_t *parser,
const char *file_name)
{
if (parser == NULL || file_name == NULL) {
return KNOT_EINVAL;
}
// Reinitialize the parser.
yp_deinit(parser);
yp_init(parser);
// Try to open the file.
parser->file.descriptor = open(file_name, O_RDONLY);
if (parser->file.descriptor == -1) {
return knot_map_errno();
}
// Check for regular file input.
struct stat file_stat;
if (fstat(parser->file.descriptor, &file_stat) == -1) {
close(parser->file.descriptor);
return knot_map_errno();
} else if (!S_ISREG(file_stat.st_mode)) {
close(parser->file.descriptor);
return KNOT_EFILE;
}
// Check for empty file (cannot mmap).
if (file_stat.st_size > 0) {
// Map the file to the memory.
char *start = mmap(0, file_stat.st_size, PROT_READ, MAP_SHARED,
parser->file.descriptor, 0);
if (start == MAP_FAILED) {
close(parser->file.descriptor);
return KNOT_ENOMEM;
}
// Try to set the mapped memory advise to sequential.
#if defined(MADV_SEQUENTIAL) && !defined(__sun)
(void)madvise(start, file_stat.st_size, MADV_SEQUENTIAL);
#else
#ifdef POSIX_MADV_SEQUENTIAL
(void)posix_madvise(start, file_stat.st_size, POSIX_MADV_SEQUENTIAL);
#endif /* POSIX_MADV_SEQUENTIAL */
#endif /* MADV_SEQUENTIAL && !__sun */
// Set the parser input limits.
parser->input.start = start;
parser->input.current = start;
parser->input.end = start + file_stat.st_size;
parser->input.eof = false;
} else {
parser->input.eof = true;
}
parser->file.name = strdup(file_name);
return KNOT_EOK;
}
_public_
int yp_parse(
yp_parser_t *parser)
{
if (parser == NULL) {
return KNOT_EINVAL;
}
int ret = KNOT_EPARSEFAIL;
// Run the parser until found new item, error or end of input.
do {
// Check for the end of the input.
if (parser->input.current == parser->input.end) {
if (parser->input.eof) {
// End of parsing.
return KNOT_EOF;
} else {
// Set the parser to final parsing.
parser->input.eof = true;
}
}
// Parse the next item.
ret = _yp_parse(parser);
} while (ret == KNOT_EFEWDATA);
return ret;
}
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