1 /* $FreeBSD$ */ 2 /* 3 * Copyright (C) 1984-2019 Mark Nudelman 4 * 5 * You may distribute under the terms of either the GNU General Public 6 * License or the Less License, as specified in the README file. 7 * 8 * For more information, see the README file. 9 */ 10 11 12 /* 13 * Entry point, initialization, miscellaneous routines. 14 */ 15 16 #include "less.h" 17 #if MSDOS_COMPILER==WIN32C 18 #define WIN32_LEAN_AND_MEAN 19 #include <windows.h> 20 #endif 21 22 public char * every_first_cmd = NULL; 23 public int new_file; 24 public int is_tty; 25 public IFILE curr_ifile = NULL_IFILE; 26 public IFILE old_ifile = NULL_IFILE; 27 public struct scrpos initial_scrpos; 28 public int any_display = FALSE; 29 public POSITION start_attnpos = NULL_POSITION; 30 public POSITION end_attnpos = NULL_POSITION; 31 public int wscroll; 32 public char * progname; 33 public int quitting; 34 public int secure; 35 public int dohelp; 36 37 #if LOGFILE 38 public int logfile = -1; 39 public int force_logfile = FALSE; 40 public char * namelogfile = NULL; 41 #endif 42 43 #if EDITOR 44 public char * editor; 45 public char * editproto; 46 #endif 47 48 #if TAGS 49 extern char * tags; 50 extern char * tagoption; 51 extern int jump_sline; 52 #endif 53 54 #ifdef WIN32 55 static char consoleTitle[256]; 56 #endif 57 58 public int one_screen; 59 extern int less_is_more; 60 extern int missing_cap; 61 extern int know_dumb; 62 extern int no_init; 63 extern int pr_type; 64 extern int quit_if_one_screen; 65 extern int no_init; 66 67 68 /* 69 * Entry point. 70 */ 71 int 72 main(argc, argv) 73 int argc; 74 char *argv[]; 75 { 76 IFILE ifile; 77 char *s; 78 79 #ifdef __EMX__ 80 _response(&argc, &argv); 81 _wildcard(&argc, &argv); 82 #endif 83 84 progname = *argv++; 85 argc--; 86 87 secure = 0; 88 s = lgetenv("LESSSECURE"); 89 if (!isnullenv(s)) 90 secure = 1; 91 92 #ifdef WIN32 93 if (getenv("HOME") == NULL) 94 { 95 /* 96 * If there is no HOME environment variable, 97 * try the concatenation of HOMEDRIVE + HOMEPATH. 98 */ 99 char *drive = getenv("HOMEDRIVE"); 100 char *path = getenv("HOMEPATH"); 101 if (drive != NULL && path != NULL) 102 { 103 char *env = (char *) ecalloc(strlen(drive) + 104 strlen(path) + 6, sizeof(char)); 105 strcpy(env, "HOME="); 106 strcat(env, drive); 107 strcat(env, path); 108 putenv(env); 109 } 110 } 111 GetConsoleTitle(consoleTitle, sizeof(consoleTitle)/sizeof(char)); 112 #endif /* WIN32 */ 113 114 /* 115 * Process command line arguments and LESS environment arguments. 116 * Command line arguments override environment arguments. 117 */ 118 is_tty = isatty(1); 119 init_mark(); 120 init_cmds(); 121 get_term(); 122 expand_cmd_tables(); 123 init_charset(); 124 init_line(); 125 init_cmdhist(); 126 init_option(); 127 init_search(); 128 129 /* 130 * If the name of the executable program is "more", 131 * act like LESS_IS_MORE is set. 132 */ 133 s = last_component(progname); 134 if (strcmp(s, "more") == 0) 135 less_is_more = 1; 136 137 init_prompt(); 138 139 if (less_is_more) 140 scan_option("-fG"); 141 142 s = lgetenv(less_is_more ? "MORE" : "LESS"); 143 if (s != NULL) 144 scan_option(save(s)); 145 146 #define isoptstring(s) less_is_more ? (((s)[0] == '-') && (s)[1] != '\0') : \ 147 (((s)[0] == '-' || (s)[0] == '+') && (s)[1] != '\0') 148 while (argc > 0 && (isoptstring(*argv) || isoptpending())) 149 { 150 s = *argv++; 151 argc--; 152 if (strcmp(s, "--") == 0) 153 break; 154 scan_option(s); 155 } 156 #undef isoptstring 157 158 if (isoptpending()) 159 { 160 /* 161 * Last command line option was a flag requiring a 162 * following string, but there was no following string. 163 */ 164 nopendopt(); 165 quit(QUIT_OK); 166 } 167 168 if (less_is_more) 169 no_init = TRUE; 170 171 #if EDITOR 172 editor = lgetenv("VISUAL"); 173 if (editor == NULL || *editor == '\0') 174 { 175 editor = lgetenv("EDITOR"); 176 if (isnullenv(editor)) 177 editor = EDIT_PGM; 178 } 179 editproto = lgetenv("LESSEDIT"); 180 if (isnullenv(editproto)) 181 editproto = "%E ?lm+%lm. %g"; 182 #endif 183 184 /* 185 * Call get_ifile with all the command line filenames 186 * to "register" them with the ifile system. 187 */ 188 ifile = NULL_IFILE; 189 if (dohelp) 190 ifile = get_ifile(FAKE_HELPFILE, ifile); 191 while (argc-- > 0) 192 { 193 #if (MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC) 194 /* 195 * Because the "shell" doesn't expand filename patterns, 196 * treat each argument as a filename pattern rather than 197 * a single filename. 198 * Expand the pattern and iterate over the expanded list. 199 */ 200 struct textlist tlist; 201 char *filename; 202 char *gfilename; 203 char *qfilename; 204 205 gfilename = lglob(*argv++); 206 init_textlist(&tlist, gfilename); 207 filename = NULL; 208 while ((filename = forw_textlist(&tlist, filename)) != NULL) 209 { 210 qfilename = shell_unquote(filename); 211 (void) get_ifile(qfilename, ifile); 212 free(qfilename); 213 ifile = prev_ifile(NULL_IFILE); 214 } 215 free(gfilename); 216 #else 217 (void) get_ifile(*argv++, ifile); 218 ifile = prev_ifile(NULL_IFILE); 219 #endif 220 } 221 /* 222 * Set up terminal, etc. 223 */ 224 if (!is_tty) 225 { 226 /* 227 * Output is not a tty. 228 * Just copy the input file(s) to output. 229 */ 230 SET_BINARY(1); 231 if (edit_first() == 0) 232 { 233 do { 234 cat_file(); 235 } while (edit_next(1) == 0); 236 } 237 quit(QUIT_OK); 238 } 239 240 if (missing_cap && !know_dumb && !less_is_more) 241 error("WARNING: terminal is not fully functional", NULL_PARG); 242 open_getchr(); 243 raw_mode(1); 244 init_signals(1); 245 246 /* 247 * Select the first file to examine. 248 */ 249 #if TAGS 250 if (tagoption != NULL || strcmp(tags, "-") == 0) 251 { 252 /* 253 * A -t option was given. 254 * Verify that no filenames were also given. 255 * Edit the file selected by the "tags" search, 256 * and search for the proper line in the file. 257 */ 258 if (nifile() > 0) 259 { 260 error("No filenames allowed with -t option", NULL_PARG); 261 quit(QUIT_ERROR); 262 } 263 findtag(tagoption); 264 if (edit_tagfile()) /* Edit file which contains the tag */ 265 quit(QUIT_ERROR); 266 /* 267 * Search for the line which contains the tag. 268 * Set up initial_scrpos so we display that line. 269 */ 270 initial_scrpos.pos = tagsearch(); 271 if (initial_scrpos.pos == NULL_POSITION) 272 quit(QUIT_ERROR); 273 initial_scrpos.ln = jump_sline; 274 } else 275 #endif 276 { 277 if (edit_first()) 278 quit(QUIT_ERROR); 279 /* 280 * See if file fits on one screen to decide whether 281 * to send terminal init. But don't need this 282 * if -X (no_init) overrides this (see init()). 283 */ 284 if (quit_if_one_screen) 285 { 286 if (nifile() > 1) /* If more than one file, -F cannot be used */ 287 quit_if_one_screen = FALSE; 288 else if (!no_init) 289 one_screen = get_one_screen(); 290 } 291 } 292 293 init(); 294 commands(); 295 quit(QUIT_OK); 296 /*NOTREACHED*/ 297 return (0); 298 } 299 300 /* 301 * Copy a string to a "safe" place 302 * (that is, to a buffer allocated by calloc). 303 */ 304 public char * 305 save(s) 306 constant char *s; 307 { 308 char *p; 309 310 p = (char *) ecalloc(strlen(s)+1, sizeof(char)); 311 strcpy(p, s); 312 return (p); 313 } 314 315 /* 316 * Allocate memory. 317 * Like calloc(), but never returns an error (NULL). 318 */ 319 public VOID_POINTER 320 ecalloc(count, size) 321 int count; 322 unsigned int size; 323 { 324 VOID_POINTER p; 325 326 p = (VOID_POINTER) calloc(count, size); 327 if (p != NULL) 328 return (p); 329 error("Cannot allocate memory", NULL_PARG); 330 quit(QUIT_ERROR); 331 /*NOTREACHED*/ 332 return (NULL); 333 } 334 335 /* 336 * Skip leading spaces in a string. 337 */ 338 public char * 339 skipsp(s) 340 char *s; 341 { 342 while (*s == ' ' || *s == '\t') 343 s++; 344 return (s); 345 } 346 347 /* 348 * See how many characters of two strings are identical. 349 * If uppercase is true, the first string must begin with an uppercase 350 * character; the remainder of the first string may be either case. 351 */ 352 public int 353 sprefix(ps, s, uppercase) 354 char *ps; 355 char *s; 356 int uppercase; 357 { 358 int c; 359 int sc; 360 int len = 0; 361 362 for ( ; *s != '\0'; s++, ps++) 363 { 364 c = *ps; 365 if (uppercase) 366 { 367 if (len == 0 && ASCII_IS_LOWER(c)) 368 return (-1); 369 if (ASCII_IS_UPPER(c)) 370 c = ASCII_TO_LOWER(c); 371 } 372 sc = *s; 373 if (len > 0 && ASCII_IS_UPPER(sc)) 374 sc = ASCII_TO_LOWER(sc); 375 if (c != sc) 376 break; 377 len++; 378 } 379 return (len); 380 } 381 382 /* 383 * Exit the program. 384 */ 385 public void 386 quit(status) 387 int status; 388 { 389 static int save_status; 390 391 /* 392 * Put cursor at bottom left corner, clear the line, 393 * reset the terminal modes, and exit. 394 */ 395 if (status < 0) 396 status = save_status; 397 else 398 save_status = status; 399 quitting = 1; 400 edit((char*)NULL); 401 save_cmdhist(); 402 if (any_display && is_tty) 403 clear_bot(); 404 deinit(); 405 flush(); 406 raw_mode(0); 407 #if MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC 408 /* 409 * If we don't close 2, we get some garbage from 410 * 2's buffer when it flushes automatically. 411 * I cannot track this one down RB 412 * The same bug shows up if we use ^C^C to abort. 413 */ 414 close(2); 415 #endif 416 #ifdef WIN32 417 SetConsoleTitle(consoleTitle); 418 #endif 419 close_getchr(); 420 exit(status); 421 } 422