/* This file is part of GNU bc.
Copyright (C) 1991-1994, 1997, 2006, 2008, 2012-2017 Free Software Foundation, Inc.
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; see the file COPYING. If not, see
<http://www.gnu.org/licenses>.
You may contact the author by:
e-mail: philnelson@acm.org
us-mail: Philip A. Nelson
Computer Science Department, 9062
Western Washington University
Bellingham, WA 98226-9062
*************************************************************************/
/* main.c: The main program for bc. */
#include "bcdefs.h"
#include <signal.h>
#include <errno.h>
#include "proto.h"
#include "getopt.h"
/* Variables for processing multiple files. */
static char first_file;
/* Points to the last node in the file name list for easy adding. */
static file_node *last = NULL;
#if defined(LIBEDIT)
/* The prompt for libedit. */
char el_pmtchars[] = "";
static char *el_pmtfunc(void);
static char *el_pmtfunc(void) { return el_pmtchars; }
#endif
/* long option support */
static struct option long_options[] =
{
{"compile", 0, &compile_only, TRUE},
{"help", 0, 0, 'h'},
{"interactive", 0, 0, 'i'},
{"mathlib", 0, &use_math, TRUE},
{"quiet", 0, &quiet, TRUE},
{"standard", 0, &std_only, TRUE},
{"version", 0, 0, 'v'},
{"warn", 0, &warn_not_std, TRUE},
{0, 0, 0, 0}
};
static void
usage (const char *progname)
{
printf ("usage: %s [options] [file ...]\n%s%s%s%s%s%s%s", progname,
" -h --help print this usage and exit\n",
" -i --interactive force interactive mode\n",
" -l --mathlib use the predefined math routines\n",
" -q --quiet don't print initial banner\n",
" -s --standard non-standard bc constructs are errors\n",
" -w --warn warn about non-standard bc constructs\n",
" -v --version print version information and exit\n");
}
static void
parse_args (int argc, char **argv)
{
int optch;
int long_index;
file_node *temp;
/* Force getopt to initialize. Depends on GNU getopt. */
optind = 0;
/* Parse the command line */
while (1)
{
optch = getopt_long (argc, argv, "chilqswv", long_options, &long_index);
if (optch == EOF) /* End of arguments. */
break;
switch (optch)
{
case 0: /* Long option setting a var. */
break;
case 'c': /* compile only */
compile_only = TRUE;
break;
case 'h': /* help */
usage(argv[0]);
bc_exit (0);
break;
case 'i': /* force interactive */
interactive = TRUE;
break;
case 'l': /* math lib */
use_math = TRUE;
break;
case 'q': /* quiet mode */
quiet = TRUE;
break;
case 's': /* Non standard features give errors. */
std_only = TRUE;
break;
case 'v': /* Print the version. */
show_bc_version ();
bc_exit (0);
break;
case 'w': /* Non standard features give warnings. */
warn_not_std = TRUE;
break;
default:
usage(argv[0]);
bc_exit (1);
}
}
#ifdef QUIET
quiet = TRUE;
#endif
/* Add file names to a list of files to process. */
while (optind < argc)
{
temp = bc_malloc(sizeof(file_node));
temp->name = argv[optind];
temp->next = NULL;
if (last == NULL)
file_names = temp;
else
last->next = temp;
last = temp;
optind++;
}
}
/* The main program for bc. */
int
main (int argc, char **argv)
{
char *env_value;
char *env_argv[30];
int env_argc;
/* Interactive? */
if (isatty(0) && isatty(1))
interactive = TRUE;
#ifdef HAVE_SETVBUF
/* attempt to simplify interaction with applications such as emacs */
(void) setvbuf(stdout, NULL, _IOLBF, 0);
#endif
/* Environment arguments. */
env_value = getenv ("BC_ENV_ARGS");
if (env_value != NULL)
{
env_argc = 1;
env_argv[0] = strdup("BC_ENV_ARGS");
while (*env_value != 0)
{
if (*env_value != ' ')
{
env_argv[env_argc++] = env_value;
while (*env_value != ' ' && *env_value != 0)
env_value++;
if (*env_value != 0)
{
*env_value = 0;
env_value++;
}
}
else
env_value++;
}
parse_args (env_argc, env_argv);
}
/* Command line arguments. */
parse_args (argc, argv);
/* Other environment processing. */
if (getenv ("POSIXLY_CORRECT") != NULL)
std_only = TRUE;
env_value = getenv ("BC_LINE_LENGTH");
if (env_value != NULL)
{
line_size = atoi (env_value);
if (line_size < 3 && line_size != 0)
line_size = 70;
}
else
line_size = 70;
/* Initialize the machine. */
init_storage();
init_load();
/* Set up interrupts to print a message. */
if (interactive)
signal (SIGINT, use_quit);
/* Initialize the front end. */
init_tree();
init_gen ();
is_std_in = FALSE;
first_file = TRUE;
if (!open_new_file ())
bc_exit (1);
#if defined(LIBEDIT)
if (interactive) {
/* Enable libedit support. */
edit = el_init ("bc", stdin, stdout, stderr);
hist = history_init();
el_set (edit, EL_EDITOR, "emacs");
el_set (edit, EL_HIST, history, hist);
el_set (edit, EL_PROMPT, el_pmtfunc);
el_source (edit, NULL);
history (hist, &histev, H_SETSIZE, INT_MAX);
}
#endif
#if defined(READLINE)
if (interactive) {
/* Readline support. Set both application name and input file. */
rl_readline_name = "bc";
rl_instream = stdin;
using_history ();
}
#endif
/* Do the parse. */
yyparse ();
/* End the compile only output with a newline. */
if (compile_only)
printf ("\n");
bc_exit (0);
return 0; // to keep the compiler from complaining
}
/* This is the function that opens all the files.
It returns TRUE if the file was opened, otherwise
it returns FALSE. */
int
open_new_file (void)
{
FILE *new_file;
file_node *temp;
/* Set the line number. */
line_no = 1;
/* Check to see if we are done. */
if (is_std_in) return (FALSE);
/* Open the other files. */
if (use_math && first_file)
{
/* Load the code from a precompiled version of the math libarary. */
CONST char **mstr;
/* These MUST be in the order of first mention of each function.
That is why "a" comes before "c" even though "a" is defined after
after "c". "a" is used in "s"! */
(void) lookup (strdup("e"), FUNCT);
(void) lookup (strdup("l"), FUNCT);
(void) lookup (strdup("s"), FUNCT);
(void) lookup (strdup("a"), FUNCT);
(void) lookup (strdup("c"), FUNCT);
(void) lookup (strdup("j"), FUNCT);
mstr = libmath;
while (*mstr) {
load_code (*mstr);
mstr++;
}
}
/* One of the argv values. */
if (file_names != NULL)
{
new_file = fopen (file_names->name, "r");
if (new_file != NULL)
{
new_yy_file (new_file);
temp = file_names;
file_name = temp->name;
file_names = temp->next;
free (temp);
return TRUE;
}
fprintf (stderr, "File %s is unavailable.\n", file_names->name);
bc_exit (1);
}
/* If we fall through to here, we should return stdin. */
new_yy_file (stdin);
is_std_in = TRUE;
return TRUE;
}
/* Set yyin to the new file. */
void
new_yy_file (FILE *file)
{
if (!first_file) fclose (yyin);
yyin = file;
first_file = FALSE;
}
/* Message to use quit. */
void
use_quit (int sig)
{
#ifdef DONTEXIT
int save = errno;
write (1, "\n(interrupt) use quit to exit.\n", 31);
signal (SIGINT, use_quit);
errno = save;
#else
write (1, "\n(interrupt) Exiting bc.\n", 26);
bc_exit(0);
#endif
}