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main.c
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main.c
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// UCLA CS 111 Lab 1 main program
// Copyright 2012-2014 Paul Eggert.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
#include <errno.h>
#include <error.h>
#include <getopt.h>
#include <stdbool.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 [-p PROF-FILE | -t] 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;
char const *profile_name = 0;
program_name = argv[0];
for (;;)
switch (getopt (argc, argv, "p:t"))
{
case 'p': profile_name = optarg; break;
case 't': print_tree = 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);
int profiling = -1;
if (profile_name)
{
profiling = prepare_profiling (profile_name);
if (profiling < 0)
error (1, errno, "%s: cannot open", profile_name);
}
command_t last_command = NULL;
command_t command;
while ((command = read_command_stream (command_stream)))
{
if (print_tree)
{
printf ("# %dn", command_number++);
print_command (command);
}
else
{
last_command = command;
execute_command (command, profiling);
}
}
return print_tree || !last_command ? 0 : command_status (last_command);
}