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/*
Copyright 2014-present Facebook. All Rights Reserved
This file is part of GlusterFS.
Author :
Shreyas Siravara <shreyas.siravara@gmail.com>
This file is licensed to you under your choice of the GNU Lesser
General Public License, version 3 or any later version (LGPLv3 or
later), or the GNU General Public License, version 2 (GPLv2), in all
cases as published by the Free Software Foundation.
*/
#include <regex.h>
#include <stdio.h>
#include "glusterfs/parse-utils.h"
#include "glusterfs/mem-pool.h"
#include "glusterfs/common-utils.h"
#include "glusterfs/libglusterfs-messages.h"
/**
* parser_init: Initialize a parser with the a string to parse and
* the regex we want to use to parse it.
*
* @complete_str: the string to parse
* @regex : the regex to use
*
* Notes : It is up to the caller to call the parser_deinit () function
* to free the allocated parser.
*
* @return : success: parser ptr (on successful compilation and allocation)
* : failure: NULL (on failure to compile regex or allocate memory)
*/
struct parser *
parser_init(const char *regex)
{
int rc = 0;
struct parser *parser = NULL;
parser = GF_MALLOC(sizeof(*parser), gf_common_mt_parser_t);
if (!parser)
goto out;
parser->regex = gf_strdup(regex);
if (!parser->regex) {
GF_FREE(parser);
parser = NULL;
goto out;
}
rc = regcomp(&parser->preg, parser->regex, REG_EXTENDED);
if (rc != 0) {
gf_msg(GF_PARSE, GF_LOG_INFO, 0, LG_MSG_REGEX_OP_FAILED,
"Failed to compile regex pattern.");
parser_deinit(parser);
parser = NULL;
goto out;
}
parser->complete_str = NULL;
out:
return parser;
}
/**
* parser_set_string -- Set the string in the parser that we want to parse.
* Subsequent calls to get_next_match () will use this
* string along with the regex that the parser was
* initialized with.
*
* @parser : The parser to use
* @complete_str: The string to set in the parser (what we are going parse)
*
* @return: success: 0
* failure: -EINVAL for NULL args, -ENOMEM for allocation errors
*/
int
parser_set_string(struct parser *parser, const char *complete_str)
{
int ret = -EINVAL;
GF_VALIDATE_OR_GOTO(GF_PARSE, parser, out);
GF_VALIDATE_OR_GOTO(GF_PARSE, complete_str, out);
parser->complete_str = gf_strdup(complete_str);
GF_CHECK_ALLOC_AND_LOG(GF_PARSE, parser, ret, "Failed to duplicate string!",
out);
/* Point the temp internal string to what we just dup'ed */
parser->_rstr = (char *)parser->complete_str;
ret = 0;
out:
return ret;
}
/**
* parser_unset_string -- Free the string that was set to be parsed.
* This function needs to be called after
* parser_set_string and parser_get_next_match
* in order to free memory used by the string.
*
* @parser : The parser to free memory in
* @return : success: 0
* : failure: -EINVAL on NULL args
*/
int
parser_unset_string(struct parser *parser)
{
int ret = -EINVAL;
GF_VALIDATE_OR_GOTO(GF_PARSE, parser, out);
GF_FREE(parser->complete_str);
parser->complete_str = NULL; /* Avoid double frees in parser_deinit */
ret = 0;
out:
return ret;
}
/**
* parser_deinit: Free the parser and all the memory allocated by it
*
* @parser : Parser to free
*
* @return : nothing
*/
void
parser_deinit(struct parser *ptr)
{
if (!ptr)
return;
regfree(&ptr->preg);
GF_FREE(ptr->complete_str);
GF_FREE(ptr->regex);
GF_FREE(ptr);
}
/**
* parser_get_match: Given the parser that is configured with a compiled regex,
* return the next match in the string.
*
* @parser : Parser to use
*
* @return : success: Pointer to matched character
* : failure: NULL
*/
char *
parser_get_next_match(struct parser *parser)
{
int rc = -EINVAL;
size_t copy_len = 0;
char *match = NULL;
GF_VALIDATE_OR_GOTO(GF_PARSE, parser, out);
rc = regexec(&parser->preg, parser->_rstr, 1, parser->pmatch, 0);
if (rc != 0) {
gf_msg_debug(GF_PARSE, 0, "Could not match %s with regex %s",
parser->_rstr, parser->regex);
goto out;
}
copy_len = parser->pmatch[0].rm_eo - parser->pmatch[0].rm_so;
match = gf_strndup(parser->_rstr + parser->pmatch[0].rm_so, copy_len);
GF_CHECK_ALLOC_AND_LOG(GF_PARSE, match, rc, "Duplicating match failed!",
out);
parser->_rstr = &parser->_rstr[parser->pmatch[0].rm_eo];
out:
return match;
}
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