/** BEGIN COPYRIGHT BLOCK
 * 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; version 2 of the License.
 * 
 * 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, write to the Free Software Foundation, Inc., 59 Temple
 * Place, Suite 330, Boston, MA 02111-1307 USA.
 * 
 * In addition, as a special exception, Red Hat, Inc. gives You the additional
 * right to link the code of this Program with code not covered under the GNU
 * General Public License ("Non-GPL Code") and to distribute linked combinations
 * including the two, subject to the limitations in this paragraph. Non-GPL Code
 * permitted under this exception must only link to the code of this Program
 * through those well defined interfaces identified in the file named EXCEPTION
 * found in the source code files (the "Approved Interfaces"). The files of
 * Non-GPL Code may instantiate templates or use macros or inline functions from
 * the Approved Interfaces without causing the resulting work to be covered by
 * the GNU General Public License. Only Red Hat, Inc. may make changes or
 * additions to the list of Approved Interfaces. You must obey the GNU General
 * Public License in all respects for all of the Program code and other code used
 * in conjunction with the Program except the Non-GPL Code covered by this
 * exception. If you modify this file, you may extend this exception to your
 * version of the file, but you are not obligated to do so. If you do not wish to
 * provide this exception without modification, you must delete this exception
 * statement from your version and license this file solely under the GPL without
 * exception. 
 * 
 * 
 * Copyright (C) 2001 Sun Microsystems, Inc. Used by permission.
 * Copyright (C) 2005 Red Hat, Inc.
 * All rights reserved.
 * END COPYRIGHT BLOCK **/

#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

#include "collate.h"
#include "config.h"
#include <stdio.h>
#include <string.h>
#include "slap.h"

#define MAXARGS 16

static char *
strtok_quote( char *line, char *sep )
{
    int inquote;
    char *tmp, *d;
    static char	*next;

    if ( line != NULL ) {
	next = line;
    }
    while ( *next && strchr( sep, *next ) ) {
	next++;
    }

    if ( *next == '\0' ) {
	next = NULL;
	return( NULL );
    }

    d = tmp = next;
    for ( inquote = 0; *next; next++ ) {
	switch ( *next ) {
	  case '"':
	    if ( inquote ) {
		inquote = 0;
	    } else {
		inquote = 1;
	    }
	    break;

#ifndef _WIN32
	  case '\\':
	    *d++ = *++next;
	    break;
#endif

	  default:
	    if ( ! inquote ) {
		if ( strchr( sep, *next ) != NULL ) {
		    *d++ = '\0';
		    next++;
		    return( tmp );
		}
	    }
	    *d++ = *next;
	    break;
	}
    }
    *d = '\0';

    return( tmp );
}

static void
fp_parse_line(
    char	*line,
    int		*argcp,
    char	**argv
)
{
	char *	token;

	*argcp = 0;
	for ( token = strtok_quote( line, " \t" ); token != NULL;
	    token = strtok_quote( NULL, " \t" ) ) {
		if ( *argcp == MAXARGS ) {
			LDAPDebug( LDAP_DEBUG_ANY, "Too many tokens (max %d)\n",
			    MAXARGS, 0, 0 );
			exit( 1 );
		}
		argv[(*argcp)++] = token;
	}
	argv[*argcp] = NULL;
}

static char	buf[BUFSIZ];
static char	*line;
static int	lmax, lcur;

static void
fp_getline_init( int *lineno )
{
	*lineno = -1;
	buf[0] = '\0';
}

#define CATLINE( buf )	{ \
	int	len; \
	len = strlen( buf ); \
	while ( lcur + len + 1 > lmax ) { \
		lmax += BUFSIZ; \
		line = (char *) slapi_ch_realloc( line, lmax ); \
	} \
	strcpy( line + lcur, buf ); \
	lcur += len; \
}

static char *
fp_getline( FILE *fp, int *lineno )
{
	char		*p;

	lcur = 0;
	CATLINE( buf );
	(*lineno)++;

	/* hack attack - keeps us from having to keep a stack of bufs... */
	if ( strncasecmp( line, "include", 7 ) == 0 ) {
		buf[0] = '\0';
		return( line );
	}

	while ( fgets( buf, sizeof(buf), fp ) != NULL ) {
		if ( (p = strchr( buf, '\n' )) != NULL ) {
			*p = '\0';
		}
		if ( ! isspace( buf[0] ) ) {
			return( line );
		}

		CATLINE( buf );
		(*lineno)++;
	}
	buf[0] = '\0';

	return( line[0] ? line : NULL );
}

void
collation_read_config( char *fname )
{
    FILE* fp;
    char* line;
    int   cargc;
    char* cargv[MAXARGS];
    int   lineno;

    fp = fopen( fname, "r" );
    if ( fp == NULL ) {
	LDAPDebug( LDAP_DEBUG_ANY,
		  "could not open config file \"%s\" - absolute path?\n",
		  fname, 0, 0 );
	return; /* Do not exit */
    }

    LDAPDebug( LDAP_DEBUG_CONFIG, "reading config file %s\n", fname, 0, 0 );

    fp_getline_init( &lineno );
    while ( (line = fp_getline( fp, &lineno )) != NULL ) {
	/* skip comments and blank lines */
	if ( line[0] == '#' || line[0] == '\0' ) {
	    continue;
	}
	LDAPDebug( LDAP_DEBUG_CONFIG, "line %d: %s\n", lineno, line, 0 );
	fp_parse_line( line, &cargc, cargv );
	if ( cargc < 1 ) {
	    LDAPDebug( LDAP_DEBUG_ANY,
		      "%s: line %d: bad config line (ignored)\n",
		      fname, lineno, 0 );
	    continue;
	}
	collation_config (cargc, cargv, fname, lineno);
    }
    fclose(fp);
}