rt-thread/components/finsh/finsh_node.c

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/*
2013-03-30 16:14:38 +08:00
* node routines for finsh shell.
*
2013-03-30 16:14:38 +08:00
* COPYRIGHT (C) 2006 - 2013, RT-Thread Development Team
*
* This file is part of RT-Thread (http://www.rt-thread.org)
* Maintainer: bernard.xiong <bernard.xiong at gmail.com>
*
* All rights reserved.
*
* 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.
*
* 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.
*
* Change Logs:
* Date Author Notes
* 2010-03-22 Bernard first version
*/
#include <finsh.h>
#include "finsh_node.h"
#include "finsh_error.h"
#include "finsh_var.h"
#include "finsh_heap.h"
struct finsh_node global_node_table[FINSH_NODE_MAX];
int finsh_node_init()
{
memset(global_node_table, 0, sizeof(global_node_table));
return 0;
}
struct finsh_node* finsh_node_allocate(u_char type)
{
int i;
/* find an empty entry */
for (i = 0; i < FINSH_NODE_MAX; i ++)
{
if (global_node_table[i].node_type == FINSH_NODE_UNKNOWN) break;
}
if (i == FINSH_NODE_MAX) return NULL;
/* fill type field */
global_node_table[i].node_type = type;
/* return this allocated node */
return &global_node_table[i];
}
struct finsh_node* finsh_node_new_id(char* id)
{
struct finsh_node* node;
void* symbol;
unsigned char type;
symbol = NULL;
type = 0;
node = NULL;
/* lookup variable firstly */
symbol = (void*)finsh_var_lookup(id);
if (symbol == NULL)
{
/* then lookup system variable */
symbol = (void*)finsh_sysvar_lookup(id);
if (symbol == NULL)
{
/* then lookup system call */
symbol = (void*)finsh_syscall_lookup(id);
if (symbol != NULL) type = FINSH_IDTYPE_SYSCALL;
}
else type = FINSH_IDTYPE_SYSVAR;
}
else type = FINSH_IDTYPE_VAR;
if (symbol != NULL)
{
/* allocate a new node */
node = finsh_node_allocate(FINSH_NODE_ID);
/* allocate node error */
if (node == NULL)
{
finsh_error_set(FINSH_ERROR_MEMORY_FULL);
return NULL;
}
/* fill node value according type */
switch (type)
{
case FINSH_IDTYPE_VAR:
node->id.var = (struct finsh_var*)symbol;
break;
case FINSH_IDTYPE_SYSVAR:
node->id.sysvar = (struct finsh_sysvar*)symbol;
break;
case FINSH_IDTYPE_SYSCALL:
node->id.syscall = (struct finsh_syscall*)symbol;
break;
}
/* fill identifier type */
node->idtype = type;
}
else finsh_error_set(FINSH_ERROR_UNKNOWN_SYMBOL);
return node;
}
struct finsh_node* finsh_node_new_char(char c)
{
struct finsh_node* node;
node = finsh_node_allocate(FINSH_NODE_VALUE_CHAR);
if (node == NULL)
{
finsh_error_set(FINSH_ERROR_MEMORY_FULL);
return NULL;
}
node->value.char_value = c;
return node;
}
struct finsh_node* finsh_node_new_int(int i)
{
struct finsh_node* node;
node = finsh_node_allocate(FINSH_NODE_VALUE_INT);
if (node == NULL)
{
finsh_error_set(FINSH_ERROR_MEMORY_FULL);
return NULL;
}
node->value.int_value = i;
return node;
}
struct finsh_node* finsh_node_new_long(long l)
{
struct finsh_node* node;
node = finsh_node_allocate(FINSH_NODE_VALUE_LONG);
if (node == NULL)
{
finsh_error_set(FINSH_ERROR_MEMORY_FULL);
return NULL;
}
node->value.long_value = l;
return node;
}
struct finsh_node* finsh_node_new_string(char* s)
{
struct finsh_node* node;
node = finsh_node_allocate(FINSH_NODE_VALUE_STRING);
if (node == NULL)
{
finsh_error_set(FINSH_ERROR_MEMORY_FULL);
return NULL;
}
/* make string */
node->value.ptr = finsh_heap_allocate(strlen(s) + 1);
strncpy(node->value.ptr, s, strlen(s));
((u_char*)node->value.ptr)[strlen(s)] = '\0';
return node;
}
struct finsh_node* finsh_node_new_ptr(void* ptr)
{
struct finsh_node* node;
node = finsh_node_allocate(FINSH_NODE_VALUE_NULL);
if (node == NULL)
{
finsh_error_set(FINSH_ERROR_MEMORY_FULL);
return NULL;
}
node->value.ptr = ptr;
return node;
}