forked from jzhang121391/COMSCI111_Lab1
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main.c
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main.c
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// UCLA CS 111 Lab 1 main program
#include <errno.h>
#include <error.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include "command.h"
static char const *program_name;
static char const *script_name;
static void
usage (void)
{
error (1, 0, "usage: %s [-pt] SCRIPT-FILE", program_name);
}
static int
get_next_byte (void *stream)
{
return getc (stream);
}
int
main (int argc, char **argv)
{
int command_number = 1;
bool print_tree = false;
bool time_travel = false;
bool time_travel_limit = false;
int num_of_processes =0;
program_name = argv[0];
char c = ' ';
for (;;)
switch (getopt (argc, argv, "ptj"))
{
case 'p': print_tree = true;c = 'p'; break;
case 't': time_travel = true; c = 't';break;
case 'j': time_travel_limit = true;
num_of_processes = atoi(argv[2]);
c = 'j';
break;
default: usage (); break;
case -1: goto options_exhausted;
}
options_exhausted:;
// There must be exactly one file argument.
if (optind != argc - 1)
{
if (argc > 1 && c == 'j' && optind == argc-2)
{}
else
{
usage ();
}
}
script_name = argv[argc - 1];
FILE *script_stream = fopen (script_name, "r");
if (! script_stream)
error (1, errno, "%s: cannot open", script_name);
command_stream_t command_stream =
make_command_stream (get_next_byte, script_stream);
command_t last_command = NULL;
command_t command;
while ((command = read_command_stream (command_stream)))
{
if (print_tree)
{
printf ("# %d\n", command_number++);
print_command (command);
}
else
{
if (time_travel == false && time_travel_limit == false)
{
last_command = command;
execute_command (command, time_travel);
}
}
}
if (time_travel == true)
{execute(command_stream);}
if (time_travel_limit == true)
{execute_limit(command_stream, num_of_processes);}
return print_tree || !last_command ? 0 : command_status (last_command);
}