finsh_var.c

中国人自己的c语言

#include "finsh_var.h"
#include "finsh_type.h"

struct finsh_var global_variable[FINSH_VARIABLE_MAX];

int finsh_var_init()
{
	memset(global_variable, 0, sizeof(global_variable));

	return 0;
}

int finsh_var_insert(const u_char* name, int type)
{
	int i, empty;

	empty = -1;
	for (i = 0; i < FINSH_VARIABLE_MAX; i ++)
	{
		/* there is a same name variable exist. */
		if (strncmp(global_variable[i].name, name, FINSH_NAME_MAX) == 0)
			return -1;

		if (global_variable[i].type == finsh_type_unknown && empty == -1)
		{
			empty = i;
		}
	}

	/* there is no empty entry */
	if (empty == -1) return -1;

	/* insert entry */
	strncpy(global_variable[empty].name, name, FINSH_NAME_MAX);
	global_variable[empty].type = type;

	/* return the offset */
	return empty;
}

int finsh_var_delete(const u_char* name)
{
	int i;

	for (i = 0; i < FINSH_VARIABLE_MAX; i ++)
	{
		if (strncpy(global_variable[i].name, name, FINSH_NAME_MAX) == 0)
			break;
	}

	/* can't find variable */
	if (i == FINSH_VARIABLE_MAX) return -1;

	memset(&global_variable[i], 0, sizeof(struct finsh_var));

	return 0;
}

struct finsh_var* finsh_var_lookup(const u_char* name)
{
	int i;

	for (i = 0; i < FINSH_VARIABLE_MAX; i ++)
	{
		if (strncmp(global_variable[i].name, name, FINSH_NAME_MAX) == 0)
			break;
	}

	/* can't find variable */
	if (i == FINSH_VARIABLE_MAX) return NULL;

	return &global_variable[i];
}