// Returns a command object based on given input.
command_struct *get_command_struct(char *input_ptr)
{
if(!*input_ptr) return 0;
command_struct *malloc_ptr = calloc(sizeof(command_struct), 1);
int num_args = get_num_args(input_ptr);
if(num_args >= 1) malloc_ptr->args_malloc_ptr[0] = get_arg_malloc_ptr(input_ptr, 0);
str_tolower(malloc_ptr->args_malloc_ptr[0]);
if(num_args >= 2) malloc_ptr->args_malloc_ptr[1] = get_arg_malloc_ptr(input_ptr, 1);
if(num_args >= 3) malloc_ptr->args_malloc_ptr[2] = get_long_arg_malloc_ptr(input_ptr, 2);
return malloc_ptr;
}
int get_and_run_userin() {
char buff[256];
fgets(buff, sizeof(buff), stdin);
// Buff will have space-separated command line arguments, then a newline,
// then a terminating null. We can use strsep to get rid of the newline.
// Since fgets will terminate on the first newline, we can be certain there
// is no next command after it
char *ptr_to_buff = buff;
char *line = strsep(&ptr_to_buff, "\n");
// Blank lines should just return 0, since a blank command doesn't 'crash'
if (!(*line)) {
return 0;
}
int num_commands = 1;
int i; for (i = 0; line[i]; i++) {
if (line[i] == ';') num_commands++;
}
char *commands[num_commands];
for (i = 0; i < num_commands; i++) {
commands[i] = strsep(&line, ";");
}
int retval;
int counter; for (counter = 0; counter < num_commands; counter++) {
if (!(commands[counter][0])) {
retval = 0;
continue;
}
// Get the number of arguments from get_num_args
int num_args = get_num_args(commands[counter]);
// Split the chunks by spaces and put into an array of char pointers of
// size num_args + 1
char *args[num_args + 1];
for (i = 0; i < num_args; i++) {
args[i] = strsep(&commands[counter], " ");
if (!args[i][0]) i--;
}
if (!args[num_args - 1][0]) args[num_args - 1] = NULL;
args[num_args] = NULL;
char *command[num_args];
int j;
int redirected = 0;
// Check for redirection or pipe symbols
for (i = 0; i < num_args; i++) {
if (!strcmp(args[i], ">")) {
for (j = 0; j < i; j++) {
command[j] = args[j];
}
command[i] = NULL;
retval = stdout_to_file_overwrite(command, args[num_args - 1]);
redirected = 1;
} else if (!strcmp(args[i], ">>")) {
for (j = 0; j < i; j++) {
command[j] = args[j];
}
command[i] = NULL;
retval = stdout_to_file_append(command, args[num_args - 1]);
redirected = 1;
} else if (!strcmp(args[i], "2>")) {
for (j = 0; j < i; j++) {
command[j] = args[j];
}
command[i] = NULL;
retval = stderr_to_file_overwrite(command, args[num_args - 1]);
redirected = 1;
} else if (!strcmp(args[i], "2>>")) {
for (j = 0; j < i; j++) {
command[j] = args[j];
}
command[i] = NULL;
retval = stderr_to_file_append(command, args[num_args - 1]);
redirected = 1;
} else if (!strcmp(args[i], "2>1")) {
for (j = 0; j < i; j++) {
command[j] = args[j];
}
command[i] = NULL;
retval = stderr_to_stdout(command);
redirected = 1;
} else if (!strcmp(args[i], "&>")) {
retval = stdout_to_stderr(command);
redirected = 1;
} else if (!strcmp(args[i], "<")) {
for (j = 0; j < i; j++){
command[j] = args[j];
}
command[i] = NULL;
retval = file_to_stdin(command, args[num_args - 1]);
redirected = 1;
} else if (!strcmp(args[i], "|")) {
char *command1[i + 1];
char *command2[num_args - i + 1];
for (j = 0; j < i; j++){
command1[j] = args[j];
}
command1[i] = NULL;
for (j = i + 1; j <= num_args; j++){
command2[j - i - 1] = args[j];
}
retval = pipe_of_wish(command1, command2);
redirected = 1;
}
}
if (!redirected) retval = execute(args[0], args);
}
return retval;
}
