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/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "symtab.h"
#include "commands.h"
#if 1
#define TRACE(...) printf(__VA_ARGS__)
#else
#define TRACE(...) /**/
#endif
typedef enum {
CMD_TYPE_UNKNOWN = -1,
CMD_TYPE_COMMAND = 0,
CMD_TYPE_FUNCTION
} CommandType;
typedef struct {
const char *name;
void *cookie;
CommandType type;
CommandArgumentType argType;
CommandHook hook;
} CommandEntry;
static struct {
SymbolTable *symbolTable;
bool commandStateInitialized;
} gCommandState;
int
commandInit()
{
if (gCommandState.commandStateInitialized) {
return -1;
}
gCommandState.symbolTable = createSymbolTable();
if (gCommandState.symbolTable == NULL) {
return -1;
}
gCommandState.commandStateInitialized = true;
return 0;
}
void
commandCleanup()
{
if (gCommandState.commandStateInitialized) {
gCommandState.commandStateInitialized = false;
deleteSymbolTable(gCommandState.symbolTable);
gCommandState.symbolTable = NULL;
//xxx need to free the entries and names in the symbol table
}
}
static int
registerCommandInternal(const char *name, CommandType type,
CommandArgumentType argType, CommandHook hook, void *cookie)
{
CommandEntry *entry;
if (!gCommandState.commandStateInitialized) {
return -1;
}
if (name == NULL || hook == NULL) {
return -1;
}
if (type != CMD_TYPE_COMMAND && type != CMD_TYPE_FUNCTION) {
return -1;
}
if (argType != CMD_ARGS_BOOLEAN && argType != CMD_ARGS_WORDS) {
return -1;
}
entry = (CommandEntry *)malloc(sizeof(CommandEntry));
if (entry != NULL) {
entry->name = strdup(name);
if (entry->name != NULL) {
int ret;
entry->cookie = cookie;
entry->type = type;
entry->argType = argType;
entry->hook = hook;
ret = addToSymbolTable(gCommandState.symbolTable,
entry->name, entry->type, entry);
if (ret == 0) {
return 0;
}
}
free(entry);
}
return -1;
}
int
registerCommand(const char *name,
CommandArgumentType argType, CommandHook hook, void *cookie)
{
return registerCommandInternal(name,
CMD_TYPE_COMMAND, argType, hook, cookie);
}
int
registerFunction(const char *name, FunctionHook hook, void *cookie)
{
return registerCommandInternal(name,
CMD_TYPE_FUNCTION, CMD_ARGS_WORDS, (CommandHook)hook, cookie);
}
Command *
findCommand(const char *name)
{
return (Command *)findInSymbolTable(gCommandState.symbolTable,
name, CMD_TYPE_COMMAND);
}
Function *
findFunction(const char *name)
{
return (Function *)findInSymbolTable(gCommandState.symbolTable,
name, CMD_TYPE_FUNCTION);
}
CommandArgumentType
getCommandArgumentType(Command *cmd)
{
CommandEntry *entry = (CommandEntry *)cmd;
if (entry != NULL) {
return entry->argType;
}
return CMD_ARGS_UNKNOWN;
}
static int
callCommandInternal(CommandEntry *entry, int argc, const char *argv[])
{
if (entry != NULL && entry->argType == CMD_ARGS_WORDS &&
(argc == 0 || (argc > 0 && argv != NULL)))
{
int i;
for (i = 0; i < argc; i++) {
if (argv[i] == NULL) {
goto bail;
}
}
TRACE("calling command %s\n", entry->name);
return entry->hook(entry->name, entry->cookie, argc, argv);
}
bail:
return -1;
}
static int
callBooleanCommandInternal(CommandEntry *entry, bool arg)
{
if (entry != NULL && entry->argType == CMD_ARGS_BOOLEAN) {
TRACE("calling boolean command %s\n", entry->name);
return entry->hook(entry->name, entry->cookie, arg ? 1 : 0, NULL);
}
return -1;
}
int
callCommand(Command *cmd, int argc, const char *argv[])
{
return callCommandInternal((CommandEntry *)cmd, argc, argv);
}
int
callBooleanCommand(Command *cmd, bool arg)
{
return callBooleanCommandInternal((CommandEntry *)cmd, arg);
}
int
callFunctionInternal(CommandEntry *entry, int argc, const char *argv[],
char **result, size_t *resultLen)
{
if (entry != NULL && entry->argType == CMD_ARGS_WORDS &&
(argc == 0 || (argc > 0 && argv != NULL)))
{
if (result != NULL)
{
/* This is the actual invocation of the function,
* which means that none of the arguments are allowed
* to be NULL.
*/
int i;
for (i = 0; i < argc; i++) {
if (argv[i] == NULL) {
goto bail;
}
}
TRACE("calling function %s\n", entry->name);
return ((FunctionHook)entry->hook)(entry->name, entry->cookie,
argc, argv, result, resultLen);
}
}
bail:
return -1;
}
int
callFunction(Function *fn, int argc, const char *argv[],
char **result, size_t *resultLen)
{
return callFunctionInternal((CommandEntry *)fn, argc, argv,
result, resultLen);
}
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