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/* main.c: The main program for bc. */
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/* This file is part of GNU bc.
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Copyright (C) 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License , or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not, write to
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The Free Software Foundation, Inc.
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59 Temple Place, Suite 330
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You may contact the author by:
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e-mail: philnelson@acm.org
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us-mail: Philip A. Nelson
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Computer Science Department, 9062
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Western Washington University
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Bellingham, WA 98226-9062
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*************************************************************************/
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/* Variables for processing multiple files. */
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static char first_file;
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/* Points to the last node in the file name list for easy adding. */
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static file_node *last = NULL;
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/* long option support */
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static struct option long_options[] =
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{"compile", 0, &compile_only, TRUE},
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{"interactive", 0, 0, 'i'},
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{"mathlib", 0, &use_math, TRUE},
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{"quiet", 0, &quiet, TRUE},
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{"standard", 0, &std_only, TRUE},
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{"version", 0, 0, 'v'},
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{"warn", 0, &warn_not_std, TRUE},
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usage (char *progname)
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printf ("usage: %s [options] [file ...]\n%s%s%s%s%s%s%s", progname,
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" -h --help print this usage and exit\n",
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" -i --interactive force interactive mode\n",
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" -l --mathlib use the predefine math routnes\n",
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" -q --quiet don't print initial banner\n",
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" -s --standard non-standard bc constructs are errors\n",
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" -w --warn warn about non-standard bc constructs\n",
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" -v --version print version information and exit\n");
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parse_args (argc, argv)
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/* Force getopt to initialize. Depends on GNU getopt. */
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/* Parse the command line */
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optch = getopt_long (argc, argv, "chilqswv", long_options, &long_index);
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if (optch == EOF) /* End of arguments. */
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case 'c': /* compile only */
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case 'i': /* force interactive */
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case 'l': /* math lib */
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case 'q': /* quiet mode */
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case 's': /* Non standard features give errors. */
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case 'v': /* Print the version. */
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case 'w': /* Non standard features give warnings. */
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/* Add file names to a list of files to process. */
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while (optind < argc)
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temp = (file_node *) bc_malloc(sizeof(file_node));
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temp->name = argv[optind];
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/* The main program for bc. */
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/* Initialize many variables. */
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compile_only = FALSE;
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warn_not_std = FALSE;
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if (isatty(0) && isatty(1))
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/* attempt to simplify interaction with applications such as emacs */
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(void) setvbuf(stdout, NULL, _IOLBF, 0);
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/* Environment arguments. */
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env_value = getenv ("BC_ENV_ARGS");
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if (env_value != NULL)
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env_argv[0] = "BC_ENV_ARGS";
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while (*env_value != 0)
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if (*env_value != ' ')
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env_argv[env_argc++] = env_value;
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while (*env_value != ' ' && *env_value != 0)
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parse_args (env_argc, env_argv);
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/* Command line arguments. */
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parse_args (argc, argv);
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/* Other environment processing. */
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if (getenv ("POSIXLY_CORRECT") != NULL)
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env_value = getenv ("BC_LINE_LENGTH");
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if (env_value != NULL)
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line_size = atoi (env_value);
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/* Initialize the machine. */
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/* Set up interrupts to print a message. */
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signal (SIGINT, use_quit);
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/* Initialize the front end. */
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if (!open_new_file ())
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/* Enable libedit support. */
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edit = el_init ("bc", stdin, stdout, stderr);
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hist = history_init();
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el_set (edit, EL_EDITOR, "emacs");
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el_set (edit, EL_HIST, history, hist);
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el_set (edit, EL_PROMPT, null_prompt);
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el_source (edit, NULL);
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history (hist, &histev, H_SETSIZE, INT_MAX);
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#if defined(READLINE)
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/* Readline support. Set both application name and input file. */
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rl_readline_name = "bc";
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/* End the compile only output with a newline. */
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/* This is the function that opens all the files.
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It returns TRUE if the file was opened, otherwise
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/* Set the line number. */
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/* Check to see if we are done. */
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if (is_std_in) return (FALSE);
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/* Open the other files. */
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if (use_math && first_file)
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/* Load the code from a precompiled version of the math libarary. */
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extern char *libmath[];
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/* These MUST be in the order of first mention of each function.
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That is why "a" comes before "c" even though "a" is defined after
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after "c". "a" is used in "s"! */
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tmp = lookup ("e", FUNCT);
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tmp = lookup ("l", FUNCT);
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tmp = lookup ("s", FUNCT);
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tmp = lookup ("a", FUNCT);
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tmp = lookup ("c", FUNCT);
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tmp = lookup ("j", FUNCT);
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/* One of the argv values. */
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if (file_names != NULL)
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new_file = fopen (file_names->name, "r");
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if (new_file != NULL)
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new_yy_file (new_file);
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file_name = temp->name;
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file_names = temp->next;
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fprintf (stderr, "File %s is unavailable.\n", file_names->name);
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/* If we fall through to here, we should return stdin. */
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/* Set yyin to the new file. */
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if (!first_file) fclose (yyin);
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/* Message to use quit. */
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printf ("\n(interrupt) use quit to exit.\n");
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signal (SIGINT, use_quit);
added
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bc/main.c
