1/* main.c: The main program for bc. */ 2 3/* This file is part of GNU bc. 4 Copyright (C) 1991-1994, 1997, 1998, 2000 Free Software Foundation, Inc. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2 of the License , or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; see the file COPYING. If not, write to 18 The Free Software Foundation, Inc. 19 59 Temple Place, Suite 330 20 Boston, MA 02111 USA 21 22 You may contact the author by: 23 e-mail: philnelson@acm.org 24 us-mail: Philip A. Nelson 25 Computer Science Department, 9062 26 Western Washington University 27 Bellingham, WA 98226-9062 28 29*************************************************************************/ 30 31#include "bcdefs.h" 32#include <signal.h> 33#include "global.h" 34#include "proto.h" 35#include "getopt.h" 36 37 38/* Variables for processing multiple files. */ 39static char first_file; 40 41/* Points to the last node in the file name list for easy adding. */ 42static file_node *last = NULL; 43 44/* long option support */ 45static struct option long_options[] = 46{ 47 {"compile", 0, &compile_only, TRUE}, 48 {"help", 0, 0, 'h'}, 49 {"interactive", 0, 0, 'i'}, 50 {"mathlib", 0, &use_math, TRUE}, 51 {"quiet", 0, &quiet, TRUE}, 52 {"standard", 0, &std_only, TRUE}, 53 {"version", 0, 0, 'v'}, 54 {"warn", 0, &warn_not_std, TRUE}, 55 56 {0, 0, 0, 0} 57}; 58 59 60void 61usage (char *progname) 62{ 63 printf ("usage: %s [options] [file ...]\n%s%s%s%s%s%s%s", progname, 64 " -h --help print this usage and exit\n", 65 " -i --interactive force interactive mode\n", 66 " -l --mathlib use the predefine math routnes\n", 67 " -q --quiet don't print initial banner\n", 68 " -s --standard non-standard bc constructs are errors\n", 69 " -w --warn warn about non-standard bc constructs\n", 70 " -v --version print version information and exit\n"); 71} 72 73 74void 75parse_args (argc, argv) 76 int argc; 77 char **argv; 78{ 79 int optch; 80 int long_index; 81 file_node *temp; 82 83 /* Force getopt to initialize. Depends on GNU getopt. */ 84 optind = 0; 85 86 /* Parse the command line */ 87 while (1) 88 { 89 optch = getopt_long (argc, argv, "chilqswv", long_options, &long_index); 90 91 if (optch == EOF) /* End of arguments. */ 92 break; 93 94 switch (optch) 95 { 96 case 'c': /* compile only */ 97 compile_only = TRUE; 98 break; 99 100 case 'h': /* help */ 101 usage(argv[0]); 102 exit (0); 103 break; 104 105 case 'i': /* force interactive */ 106 interactive = TRUE; 107 break; 108 109 case 'l': /* math lib */ 110 use_math = TRUE; 111 break; 112 113 case 'q': /* quiet mode */ 114 quiet = TRUE; 115 break; 116 117 case 's': /* Non standard features give errors. */ 118 std_only = TRUE; 119 break; 120 121 case 'v': /* Print the version. */ 122 show_bc_version (); 123 exit (0); 124 break; 125 126 case 'w': /* Non standard features give warnings. */ 127 warn_not_std = TRUE; 128 break; 129 130 case 0: 131 break; 132 133 default: 134 usage(argv[0]); 135 exit (1); 136 } 137 } 138 139 /* Add file names to a list of files to process. */ 140 while (optind < argc) 141 { 142 temp = (file_node *) bc_malloc(sizeof(file_node)); 143 temp->name = argv[optind]; 144 temp->next = NULL; 145 if (last == NULL) 146 file_names = temp; 147 else 148 last->next = temp; 149 last = temp; 150 optind++; 151 } 152} 153 154/* The main program for bc. */ 155int 156main (argc, argv) 157 int argc; 158 char *argv[]; 159{ 160 char *env_value; 161 char *env_argv[30]; 162 int env_argc; 163 164 /* Initialize many variables. */ 165 compile_only = FALSE; 166 use_math = FALSE; 167 warn_not_std = FALSE; 168 std_only = FALSE; 169 if (isatty(0) && isatty(1)) 170 interactive = TRUE; 171 else 172 interactive = FALSE; 173 quiet = FALSE; 174 file_names = NULL; 175 176#ifdef HAVE_SETVBUF 177 /* attempt to simplify interaction with applications such as emacs */ 178 (void) setvbuf(stdout, NULL, _IOLBF, 0); 179#endif 180 181 /* Environment arguments. */ 182 env_value = getenv ("BC_ENV_ARGS"); 183 if (env_value != NULL) 184 { 185 env_argc = 1; 186 env_argv[0] = "BC_ENV_ARGS"; 187 while (*env_value != 0) 188 { 189 if (*env_value != ' ') 190 { 191 env_argv[env_argc++] = env_value; 192 while (*env_value != ' ' && *env_value != 0) 193 env_value++; 194 if (*env_value != 0) 195 { 196 *env_value = 0; 197 env_value++; 198 } 199 } 200 else 201 env_value++; 202 } 203 parse_args (env_argc, env_argv); 204 } 205 206 /* Command line arguments. */ 207 parse_args (argc, argv); 208 209 /* Other environment processing. */ 210 if (getenv ("POSIXLY_CORRECT") != NULL) 211 std_only = TRUE; 212 213 env_value = getenv ("BC_LINE_LENGTH"); 214 if (env_value != NULL) 215 { 216 line_size = atoi (env_value); 217 if (line_size < 2) 218 line_size = 70; 219 } 220 else 221 line_size = 70; 222 223 /* Initialize the machine. */ 224 init_storage(); 225 init_load(); 226 227 /* Set up interrupts to print a message. */ 228 if (interactive) 229 signal (SIGINT, use_quit); 230 231 /* Initialize the front end. */ 232 init_tree(); 233 init_gen (); 234 is_std_in = FALSE; 235 first_file = TRUE; 236 if (!open_new_file ()) 237 exit (1); 238 239#if defined(LIBEDIT) 240 if (interactive) { 241 /* Enable libedit support. */ 242 edit = el_init ("bc", stdin, stdout, stderr); 243 hist = history_init(); 244 el_set (edit, EL_EDITOR, "emacs"); 245 el_set (edit, EL_HIST, history, hist); 246 el_set (edit, EL_PROMPT, null_prompt); 247 el_source (edit, NULL); 248 history (hist, &histev, H_SETSIZE, INT_MAX); 249 } 250#endif 251 252#if defined(READLINE) 253 if (interactive) { 254 /* Readline support. Set both application name and input file. */ 255 rl_readline_name = "bc"; 256 rl_instream = stdin; 257 using_history (); 258 } 259#endif 260 261 /* Do the parse. */ 262 yyparse (); 263 264 /* End the compile only output with a newline. */ 265 if (compile_only) 266 printf ("\n"); 267 268 exit (0); 269} 270 271 272/* This is the function that opens all the files. 273 It returns TRUE if the file was opened, otherwise 274 it returns FALSE. */ 275 276int 277open_new_file () 278{ 279 FILE *new_file; 280 file_node *temp; 281 282 /* Set the line number. */ 283 line_no = 1; 284 285 /* Check to see if we are done. */ 286 if (is_std_in) return (FALSE); 287 288 /* Open the other files. */ 289 if (use_math && first_file) 290 { 291 /* Load the code from a precompiled version of the math libarary. */ 292 extern char *libmath[]; 293 char **mstr; 294 char tmp; 295 /* These MUST be in the order of first mention of each function. 296 That is why "a" comes before "c" even though "a" is defined after 297 after "c". "a" is used in "s"! */ 298 tmp = lookup ("e", FUNCT); 299 tmp = lookup ("l", FUNCT); 300 tmp = lookup ("s", FUNCT); 301 tmp = lookup ("a", FUNCT); 302 tmp = lookup ("c", FUNCT); 303 tmp = lookup ("j", FUNCT); 304 mstr = libmath; 305 while (*mstr) { 306 load_code (*mstr); 307 mstr++; 308 } 309 } 310 311 /* One of the argv values. */ 312 if (file_names != NULL) 313 { 314 new_file = fopen (file_names->name, "r"); 315 if (new_file != NULL) 316 { 317 new_yy_file (new_file); 318 temp = file_names; 319 file_name = temp->name; 320 file_names = temp->next; 321 free (temp); 322 return TRUE; 323 } 324 fprintf (stderr, "File %s is unavailable.\n", file_names->name); 325 exit (1); 326 } 327 328 /* If we fall through to here, we should return stdin. */ 329 new_yy_file (stdin); 330 is_std_in = TRUE; 331 return TRUE; 332} 333 334 335/* Set yyin to the new file. */ 336 337void 338new_yy_file (file) 339 FILE *file; 340{ 341 if (!first_file) fclose (yyin); 342 yyin = file; 343 first_file = FALSE; 344} 345 346 347/* Message to use quit. */ 348 349void 350use_quit (sig) 351 int sig; 352{ 353 printf ("\n(interrupt) use quit to exit.\n"); 354 signal (SIGINT, use_quit); 355} 356