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-rw-r--r--src/libknot/yparser/yparser.c178
1 files changed, 178 insertions, 0 deletions
diff --git a/src/libknot/yparser/yparser.c b/src/libknot/yparser/yparser.c
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+++ b/src/libknot/yparser/yparser.c
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+/* Copyright (C) 2017 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;
+ }
+
+ char *start = NULL;
+
+ // Check for empty file (cannot mmap).
+ if (file_stat.st_size > 0) {
+ // Map the file to the memory.
+ 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 */
+
+ parser->input.eof = false;
+ } else {
+ parser->input.eof = true;
+ }
+
+ parser->file.name = strdup(file_name);
+
+ // Set the parser input limits.
+ parser->input.start = start;
+ parser->input.current = start;
+ parser->input.end = start + file_stat.st_size;
+
+ 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;
+}