params.c

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/*
 * Copyright (C) 2013 Michael Brown <mbrown@fensystems.co.uk>.
 *
 * 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 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 *
 * You can also choose to distribute this program under the terms of
 * the Unmodified Binary Distribution Licence (as given in the file
 * COPYING.UBDL), provided that you have satisfied its requirements.
 */
 
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
FILE_SECBOOT ( PERMITTED );
 
/** @file
 *
 * Request parameters
 *
 */
 
#include <stdlib.h>
#include <string.h>
#include <ipxe/params.h>
 
/** List of all parameter lists */
static LIST_HEAD ( parameters );
 
/**
 * Free request parameter list
 *
 * @v refcnt            Reference count
 */
static void free_parameters ( struct refcnt *refcnt ) {
        struct parameters *params =
                container_of ( refcnt, struct parameters, refcnt );
        struct parameter *param;
        struct parameter *tmp;
 
        DBGC ( params, "PARAMS \"%s\" destroyed\n", params->name );
 
        /* Free all parameters */
        list_for_each_entry_safe ( param, tmp, &params->entries, list ) {
                list_del ( &param->list );
                free ( param );
        }
 
        /* Free parameter list */
        free ( params );
}
 
/**
 * Find request parameter list by name
 *
 * @v name              Parameter list name (may be NULL)
 * @ret params          Parameter list, or NULL if not found
 */
struct parameters * find_parameters ( const char *name ) {
        struct parameters *params;
 
        list_for_each_entry ( params, &parameters, list ) {
                if ( ( params->name == name ) ||
                     ( strcmp ( params->name, name ) == 0 ) ) {
                        return params;
                }
        }
        return NULL;
}
 
/**
 * Create request parameter list
 *
 * @v name              Parameter list name (may be NULL)
 * @ret params          Parameter list, or NULL on failure
 */
struct parameters * create_parameters ( const char *name ) {
        struct parameters *params;
        size_t name_len;
        char *name_copy;
 
        /* Destroy any existing parameter list of this name */
        params = find_parameters ( name );
        if ( params ) {
                claim_parameters ( params );
                params_put ( params );
        }
 
        /* Allocate parameter list */
        name_len = ( name ? ( strlen ( name ) + 1 /* NUL */ ) : 0 );
        params = zalloc ( sizeof ( *params ) + name_len );
        if ( ! params )
                return NULL;
        ref_init ( &params->refcnt, free_parameters );
        name_copy = ( ( void * ) ( params + 1 ) );
 
        /* Populate parameter list */
        if ( name ) {
                strcpy ( name_copy, name );
                params->name = name_copy;
        }
        INIT_LIST_HEAD ( &params->entries );
 
        /* Add to list of parameter lists */
        list_add_tail ( &params->list, &parameters );
 
        DBGC ( params, "PARAMS \"%s\" created\n", params->name );
        return params;
}
 
/**
 * Add request parameter
 *
 * @v params            Parameter list
 * @v key               Parameter key
 * @v value             Parameter value
 * @v flags             Parameter flags
 * @ret param           Parameter, or NULL on failure
 */
struct parameter * add_parameter ( struct parameters *params,
                                   const char *key, const char *value,
                                   unsigned int flags ) {
        struct parameter *param;
        size_t key_len;
        size_t value_len;
        char *key_copy;
        char *value_copy;
 
        /* Allocate parameter */
        key_len = ( strlen ( key ) + 1 /* NUL */ );
        value_len = ( strlen ( value ) + 1 /* NUL */ );
        param = zalloc ( sizeof ( *param ) + key_len + value_len );
        if ( ! param )
                return NULL;
        key_copy = ( ( void * ) ( param + 1 ) );
        value_copy = ( key_copy + key_len );
 
        /* Populate parameter */
        strcpy ( key_copy, key );
        param->key = key_copy;
        strcpy ( value_copy, value );
        param->value = value_copy;
        param->flags = flags;
 
        /* Add to list of parameters */
        list_add_tail ( &param->list, &params->entries );
 
        DBGC ( params, "PARAMS \"%s\" added \"%s\"=\"%s\"%s%s\n",
               params->name, param->key, param->value,
               ( ( param->flags & PARAMETER_FORM ) ? " (form)" : "" ),
               ( ( param->flags & PARAMETER_HEADER ) ? " (header)" : "" ) );
        return param;
}