1 files changed, 174 insertions, 0 deletions
diff --git a/finsh/finsh_node.c b/finsh/finsh_node.c
new file mode 100644
index 0000000000..b5d7461adc
--- /dev/null
+++ b/finsh/finsh_node.c
@@ -0,0 +1,174 @@
+#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;
+}