[params] Add support for the general concept of a form parameter list

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/core/params.c

@@ -0,0 +1,165 @@
+/*
+ * 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.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+/** @file
+ *
+ * Form parameters
+ *
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <ipxe/params.h>
+
+/** List of all parameter lists */
+static LIST_HEAD ( parameters );
+
+/**
+ * Find form 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 form 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 )
+		destroy_parameters ( params );
+
+	/* Allocate parameter list */
+	name_len = ( name ? ( strlen ( name ) + 1 /* NUL */ ) : 0 );
+	params = zalloc ( sizeof ( *params ) + name_len );
+	if ( ! params )
+		return NULL;
+	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 form parameter
+ *
+ * @v params		Parameter list
+ * @v key		Parameter key
+ * @v value		Parameter value
+ * @ret param		Parameter, or NULL on failure
+ */
+struct parameter * add_parameter ( struct parameters *params,
+				   const char *key, const char *value ) {
+	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;
+
+	/* Add to list of parameters */
+	list_add_tail ( &param->list, &params->entries );
+
+	DBGC ( params, "PARAMS \"%s\" added \"%s\"=\"%s\"\n",
+	       params->name, param->key, param->value );
+	return param;
+}
+
+/**
+ * Destroy form parameter list
+ *
+ * @v params		Parameter list
+ */
+void destroy_parameters ( struct parameters *params ) {
+	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 */
+	list_del ( &params->list );
+	free ( params );
+}
+
+/**
+ * Claim ownership of form parameter list
+ *
+ * @v params		Parameter list
+ */
+void claim_parameters ( struct parameters *params ) {
+
+	DBGC ( params, "PARAMS \"%s\" claimed\n", params->name );
+
+	/* Remove from list of parameter lists */
+	list_del ( &params->list );
+
+	/* Reinitialise list to allow for subsequent destroy_parameters() */
+	INIT_LIST_HEAD ( &params->list );
+}

src/core/parseopt.c

@@ -29,6 +29,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
 #include <ipxe/netdevice.h>
 #include <ipxe/menu.h>
 #include <ipxe/settings.h>
+#include <ipxe/params.h>
 #include <ipxe/parseopt.h>
 
 /** @file
@@ -250,6 +251,29 @@ int parse_autovivified_setting ( char *text, struct named_setting *setting ) {
 	return parse_setting ( text, setting, autovivify_child_settings );
 }
 
+/**
+ * Parse form parameter list name
+ *
+ * @v text		Text
+ * @ret params		Parameter list
+ * @ret rc		Return status code
+ */
+int parse_parameters ( char *text, struct parameters **params ) {
+
+	/* Find parameter list */
+	*params = find_parameters ( text );
+	if ( ! *params ) {
+		if ( text ) {
+			printf ( "\"%s\": no such parameter list\n", text );
+		} else {
+			printf ( "No default parameter list\n" );
+		}
+		return -ENOENT;
+	}
+
+	return 0;
+}
+
 /**
  * Print command usage message
  *

src/include/ipxe/params.h

@@ -0,0 +1,46 @@
+#ifndef _IPXE_PARAMS_H
+#define _IPXE_PARAMS_H
+
+/** @file
+ *
+ * Form parameters
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <ipxe/list.h>
+#include <ipxe/refcnt.h>
+
+/** A form parameter list */
+struct parameters {
+	/** List of all parameter lists */
+	struct list_head list;
+	/** Name */
+	const char *name;
+	/** Parameters */
+	struct list_head entries;
+};
+
+/** A form parameter */
+struct parameter {
+	/** List of form parameters */
+	struct list_head list;
+	/** Key */
+	const char *key;
+	/** Value */
+	const char *value;
+};
+
+/** Iterate over all form parameters in a list */
+#define for_each_param( param, params )				\
+	list_for_each_entry ( (param), &(params)->entries, list )
+
+extern struct parameters * find_parameters ( const char *name );
+extern struct parameters * create_parameters ( const char *name );
+extern struct parameter * add_parameter ( struct parameters *params,
+					  const char *key, const char *value );
+extern void destroy_parameters ( struct parameters *params );
+extern void claim_parameters ( struct parameters *params );
+
+#endif /* _IPXE_PARAMS_H */

src/include/ipxe/parseopt.h

@@ -15,6 +15,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
 
 struct net_device;
 struct menu;
+struct parameters;
 
 /** A command-line option descriptor */
 struct option_descriptor {
@@ -135,6 +136,7 @@ extern int parse_setting ( char *text, struct named_setting *setting,
 extern int parse_existing_setting ( char *text, struct named_setting *setting );
 extern int parse_autovivified_setting ( char *text,
 					struct named_setting *setting );
+extern int parse_parameters ( char *text, struct parameters **params );
 extern void print_usage ( struct command_descriptor *cmd, char **argv );
 extern int reparse_options ( int argc, char **argv,
 			     struct command_descriptor *cmd, void *opts );