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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 "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;
program_name = argv[0];
for (;;)
switch (getopt (argc, argv, "pt"))
{
case 'p': print_tree = true; break;
case 't': time_travel = true; break;
default: usage (); break;
case -1: goto options_exhausted;
}
options_exhausted:;
// There must be exactly one file argument.
if (optind != argc - 1)
usage ();
script_name = argv[optind];
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;
if (time_travel)
{
execute_command_t(command_stream,&last_command);
}
else
{
while ((command = read_command_stream (command_stream)))
{
if (print_tree)
{
printf ("# %d\n", command_number++);
print_command (command);
}
else
{
last_command = command;
execute_command (command, time_travel);
}
}
}
return print_tree || !last_command ? 0 : command_status (last_command);
}