File: options.h

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/*
 * Copyright (c) 2002, 2003, 2004, Scott Nicol <esniper@users.sf.net>
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
 * OWNER 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.
 */

#ifndef OPTIONS_H_INCLUDED
#define OPTIONS_H_INCLUDED

/* data types for option or configuration values */
#define OPTION_STRING   1
#define OPTION_INT      2
#define OPTION_BOOL     3
#define OPTION_BOOL_NEG 4
/* The special data types OPTION_SPECSTR and OPTION_SPECINT must be handled
 * by the checking function, which is mandatory here.
 * The parsing function does not care about the data type. It will provide
 * the string value or NULL to the checking function.
 * Distinguishing between numeric (including bool) and string values
 * is important for the logging function that prints all option values.
 */
#define OPTION_SPECSTR  5
#define OPTION_SPECINT  6

/* flags to control logging of option values */
#define LOG_NORMAL 1 /* log value normal */
#define LOG_CONFID 2 /* log value as *** */

/* table to describe all option or configuration values */
typedef struct optionTable optionTable_t;

struct optionTable {
	const char *configname;	/* keyword in configuration files */
	const char *optionname;	/* option without '-' */
	void *value;		/* variable to store value */
	int type;		/* data type of expected value or option arg */
	int logging;            /* control logging of value (see LOG_*) */
	/* This function will be called to check and copy value if specified.
	 * It can get the value by other means than converting the string
	 * found in configuration file or on command line.
	 */
	int (*checkfunc)(const void* valueptr, const optionTable_t* tableptr,
			 const char* filename, const char *line);
	int isSet;
};

extern int readConfigFile(const char *filename, optionTable_t *table);
extern int parseGetoptValue(int option, const char *optval,
			    optionTable_t *table);
extern char * logOptionValues(const optionTable_t *table);

#endif /* OPTIONS_H_INCLUDED */