Command* listToCommand(const List* list)
{
ListNode* node;
Command* command;
if(list == NULL || linkedListSize(list) == 0)
return NULL;
command = (Command*) malloc( sizeof(Command) );
command->command = newLinkedList();
node = list->head;
/* each argument is just inserted into the command's argument list */
while(node != NULL)
{
linkedListInsert(command->command, node->data);
node = node->next;
}
command->infile = NULL;
command->outfile = NULL;
return command;
}
int testInsert() {
LinkedList list;
linkedListInit(&list, INTEGER);
_assert(linkedListInsert(&list, 1, (mixed)1) == 1); // it succeeds
// 1
_assert(linkedListIndexOf(&list, (mixed)1) == 0);
_assert(linkedListInsert(&list, 0, (mixed)2) == 1); // it succeeds
// 2 -> 1
_assert(linkedListIndexOf(&list, (mixed)2) == 0);
_assert(linkedListInsert(&list, 1, (mixed)3) == 1); // it succeeds
// 2 -> 3 -> 1
_assert(linkedListIndexOf(&list, (mixed)2) == 0);
_assert(linkedListIndexOf(&list, (mixed)3) == 1);
_assert(linkedListIndexOf(&list, (mixed)1) == 2);
return 0;
}
int commandChangeDirectory(Command* cmd)
{
int size;
int ret;
char* errorMsg;
if(cmd == NULL)
return 0;
size = linkedListSize(cmd->command);
/* if the user specifies more than one argument it is an error */
if(size > 2)
{
fprintf(stderr, "cd: Too many arguments.\n");
return -1;
}
/* if the user did not specify a directory, the default behavior is to go to the user's home directory */
if(size < 2)
linkedListInsert(cmd->command, getenv("HOME"));
ret = chdir((char*)cmd->command->head->next->data);
/* check for error */
if(ret == -1)
{
/* determine the specific type of error */
switch(errno)
{
case EACCES:
errorMsg = "Search permission is denied.";
break;
case ELOOP:
errorMsg = "A symbolic link loop was encountered.";
break;
case ENAMETOOLONG:
errorMsg = "The pathname is too long.";
break;
case ENOENT:
errorMsg = "The path does not exist.";
break;
case ENOTDIR:
errorMsg = "The path is not a directory.";
break;
default:
errorMsg = "Unknown error.";
break;
}
printf("%s: %s\n",(char*)cmd->command->head->next->data,errorMsg);
return -1;
}
/* otherwise we were successful */
return 0;
}
/**
* @see linkedListInsert
*/
void linkedListPrepend(LinkedList* dis, void* data)
{
linkedListInsert(dis, data, 0);
}
/**
* @see linkedListInsert
*/
void linkedListAppend(LinkedList* dis, void* data)
{
linkedListInsert(dis, data, linkedListSize(dis));
}
