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/**
* @file lexparser.c
*
* @brief lexical parser for text-based configuration files
*
*/
/*
* Copyright (C) 2001-2006 Andreas Steffen, Zuercher Hochschule Winterthur
*
* 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 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#include <string.h>
#include "lexparser.h"
/**
* eat whitespace
*/
bool eat_whitespace(chunk_t *src)
{
while (src->len > 0 && (*src->ptr == ' ' || *src->ptr == '\t'))
{
src->ptr++; src->len--;
}
return src->len > 0 && *src->ptr != '#';
}
/**
* compare string with chunk
*/
bool match(const char *pattern, const chunk_t *ch)
{
return ch->len == strlen(pattern) && strncmp(pattern, ch->ptr, ch->len) == 0;
}
/**
* extracts a token ending with a given termination symbol
*/
bool extract_token(chunk_t *token, const char termination, chunk_t *src)
{
u_char *eot = memchr(src->ptr, termination, src->len);
/* initialize empty token */
*token = chunk_empty;
if (eot == NULL) /* termination symbol not found */
{
return FALSE;
}
/* extract token */
token->ptr = src->ptr;
token->len = (u_int)(eot - src->ptr);
/* advance src pointer after termination symbol */
src->ptr = eot + 1;
src->len -= (token->len + 1);
return TRUE;
}
/**
* fetches a new line terminated by \n or \r\n
*/
bool fetchline(chunk_t *src, chunk_t *line)
{
if (src->len == 0) /* end of src reached */
return FALSE;
if (extract_token(line, '\n', src))
{
if (line->len > 0 && *(line->ptr + line->len -1) == '\r')
line->len--; /* remove optional \r */
}
else /*last line ends without newline */
{
*line = *src;
src->ptr += src->len;
src->len = 0;
}
return TRUE;
}
err_t extract_value(chunk_t *value, chunk_t *line)
{
char delimiter = ' ';
if (!eat_whitespace(line))
{
*value = chunk_empty;
return NULL;
}
if (*line->ptr == '\'' || *line->ptr == '"')
{
delimiter = *line->ptr;
line->ptr++; line->len--;
}
if (!extract_token(value, delimiter, line))
{
if (delimiter == ' ')
{
*value = *line;
line->len = 0;
}
else
{
return "missing second delimiter";
}
}
return NULL;
}
/**
* extracts a parameter: value pair
*/
err_t extract_parameter_value(chunk_t *name, chunk_t *value, chunk_t *line)
{
/* extract name */
if (!extract_token(name,':', line))
{
return "missing ':'";
}
/* extract value */
return extract_value(value, line);
}
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