/* This file is part of GNU bc. Copyright (C) 1991-1994, 1997, 2006 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 2 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, write to: The Free Software Foundation, Inc. Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 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 #include #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; /* 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 (argc, argv) 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]); 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 (); exit (0); break; case 'w': /* Non standard features give warnings. */ warn_not_std = TRUE; break; default: usage(argv[0]); exit (1); } } #ifdef QUIET quiet = TRUE; #endif /* Add file names to a list of files to process. */ while (optind < argc) { temp = (file_node *) 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 (argc, argv) int argc; char *argv[]; { char *env_value; const 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] = "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 ()) 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, null_prompt); 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"); #if defined(LIBEDIT) if (edit != NULL) el_end(edit); #endif exit (0); } /* 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 () { 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. */ extern char *libmath[]; char **mstr; char tmp; /* 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"! */ tmp = lookup ("e", FUNCT); tmp = lookup ("l", FUNCT); tmp = lookup ("s", FUNCT); tmp = lookup ("a", FUNCT); tmp = lookup ("c", FUNCT); tmp = lookup ("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); 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 *file; { if (!first_file) fclose (yyin); yyin = file; first_file = FALSE; } /* Message to use quit. */ void use_quit (sig) 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); #if defined(LIBEDIT) if (edit != NULL) el_end(edit); #endif exit(0); #endif }