1 /* $FreeBSD$ */ 2 /* 3 * Copyright (C) 1984-2017 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 #include <windows.h> 19 #endif 20 21 public char * every_first_cmd = NULL; 22 public int new_file; 23 public int is_tty; 24 public IFILE curr_ifile = NULL_IFILE; 25 public IFILE old_ifile = NULL_IFILE; 26 public struct scrpos initial_scrpos; 27 public int any_display = FALSE; 28 public POSITION start_attnpos = NULL_POSITION; 29 public POSITION end_attnpos = NULL_POSITION; 30 public int wscroll; 31 public char * progname; 32 public int quitting; 33 public int secure; 34 public int dohelp; 35 36 #if LOGFILE 37 public int logfile = -1; 38 public int force_logfile = FALSE; 39 public char * namelogfile = NULL; 40 #endif 41 42 #if EDITOR 43 public char * editor; 44 public char * editproto; 45 #endif 46 47 #if TAGS 48 extern char * tags; 49 extern char * tagoption; 50 extern int jump_sline; 51 #endif 52 53 #ifdef WIN32 54 static char consoleTitle[256]; 55 #endif 56 57 public int line_count; 58 extern int less_is_more; 59 extern int missing_cap; 60 extern int know_dumb; 61 extern int no_init; 62 extern int pr_type; 63 extern int quit_if_one_screen; 64 65 66 /* 67 * Entry point. 68 */ 69 int 70 main(argc, argv) 71 int argc; 72 char *argv[]; 73 { 74 IFILE ifile; 75 char *s; 76 extern char *__progname; 77 78 #ifdef __EMX__ 79 _response(&argc, &argv); 80 _wildcard(&argc, &argv); 81 #endif 82 83 progname = *argv++; 84 argc--; 85 86 secure = 0; 87 s = lgetenv("LESSSECURE"); 88 if (s != NULL && *s != '\0') 89 secure = 1; 90 91 #ifdef WIN32 92 if (getenv("HOME") == NULL) 93 { 94 /* 95 * If there is no HOME environment variable, 96 * try the concatenation of HOMEDRIVE + HOMEPATH. 97 */ 98 char *drive = getenv("HOMEDRIVE"); 99 char *path = getenv("HOMEPATH"); 100 if (drive != NULL && path != NULL) 101 { 102 char *env = (char *) ecalloc(strlen(drive) + 103 strlen(path) + 6, sizeof(char)); 104 strcpy(env, "HOME="); 105 strcat(env, drive); 106 strcat(env, path); 107 putenv(env); 108 } 109 } 110 GetConsoleTitle(consoleTitle, sizeof(consoleTitle)/sizeof(char)); 111 #endif /* WIN32 */ 112 113 /* 114 * Process command line arguments and LESS environment arguments. 115 * Command line arguments override environment arguments. 116 */ 117 is_tty = isatty(1); 118 get_term(); 119 init_cmds(); 120 init_charset(); 121 init_line(); 122 init_cmdhist(); 123 init_option(); 124 init_search(); 125 126 /* 127 * If the name of the executable program is "more", 128 * act like LESS_IS_MORE is set. 129 */ 130 for (s = progname + strlen(progname); s > progname; s--) 131 { 132 if (s[-1] == PATHNAME_SEP[0]) 133 break; 134 } 135 if (strcmp(s, "more") == 0) 136 less_is_more = 1; 137 138 init_prompt(); 139 140 if (less_is_more) 141 scan_option("-fG"); 142 143 s = lgetenv(less_is_more ? "MORE" : "LESS"); 144 if (s != NULL) 145 scan_option(save(s)); 146 147 #define isoptstring(s) less_is_more ? (((s)[0] == '-') && (s)[1] != '\0') : \ 148 (((s)[0] == '-' || (s)[0] == '+') && (s)[1] != '\0') 149 while (argc > 0 && (isoptstring(*argv) || isoptpending())) 150 { 151 s = *argv++; 152 argc--; 153 if (strcmp(s, "--") == 0) 154 break; 155 scan_option(s); 156 } 157 #undef isoptstring 158 159 if (isoptpending()) 160 { 161 /* 162 * Last command line option was a flag requiring a 163 * following string, but there was no following string. 164 */ 165 nopendopt(); 166 quit(QUIT_OK); 167 } 168 169 if (less_is_more) 170 no_init = TRUE; 171 172 #if EDITOR 173 editor = lgetenv("VISUAL"); 174 if (editor == NULL || *editor == '\0') 175 { 176 editor = lgetenv("EDITOR"); 177 if (editor == NULL || *editor == '\0') 178 editor = EDIT_PGM; 179 } 180 editproto = lgetenv("LESSEDIT"); 181 if (editproto == NULL || *editproto == '\0') 182 editproto = "%E ?lm+%lm. %f"; 183 #endif 184 185 /* 186 * Call get_ifile with all the command line filenames 187 * to "register" them with the ifile system. 188 */ 189 ifile = NULL_IFILE; 190 if (dohelp) 191 ifile = get_ifile(FAKE_HELPFILE, ifile); 192 while (argc-- > 0) 193 { 194 char *filename; 195 #if (MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC) 196 /* 197 * Because the "shell" doesn't expand filename patterns, 198 * treat each argument as a filename pattern rather than 199 * a single filename. 200 * Expand the pattern and iterate over the expanded list. 201 */ 202 struct textlist tlist; 203 char *gfilename; 204 205 gfilename = lglob(*argv++); 206 init_textlist(&tlist, gfilename); 207 filename = NULL; 208 while ((filename = forw_textlist(&tlist, filename)) != NULL) 209 { 210 (void) get_ifile(filename, ifile); 211 ifile = prev_ifile(NULL_IFILE); 212 } 213 free(gfilename); 214 #else 215 filename = shell_quote(*argv); 216 if (filename == NULL) 217 filename = *argv; 218 argv++; 219 (void) get_ifile(filename, ifile); 220 ifile = prev_ifile(NULL_IFILE); 221 free(filename); 222 #endif 223 } 224 /* 225 * Set up terminal, etc. 226 */ 227 if (!is_tty) 228 { 229 /* 230 * Output is not a tty. 231 * Just copy the input file(s) to output. 232 */ 233 SET_BINARY(1); 234 if (nifile() == 0) 235 { 236 if (edit_stdin() == 0) 237 cat_file(); 238 } else if (edit_first() == 0) 239 { 240 do { 241 cat_file(); 242 } while (edit_next(1) == 0); 243 } 244 quit(QUIT_OK); 245 } 246 247 if (missing_cap && !know_dumb && !less_is_more) 248 error("WARNING: terminal is not fully functional", NULL_PARG); 249 init_mark(); 250 open_getchr(); 251 raw_mode(1); 252 init_signals(1); 253 254 /* 255 * Select the first file to examine. 256 */ 257 #if TAGS 258 if (tagoption != NULL || strcmp(tags, "-") == 0) 259 { 260 /* 261 * A -t option was given. 262 * Verify that no filenames were also given. 263 * Edit the file selected by the "tags" search, 264 * and search for the proper line in the file. 265 */ 266 if (nifile() > 0) 267 { 268 error("No filenames allowed with -t option", NULL_PARG); 269 quit(QUIT_ERROR); 270 } 271 findtag(tagoption); 272 if (edit_tagfile()) /* Edit file which contains the tag */ 273 quit(QUIT_ERROR); 274 /* 275 * Search for the line which contains the tag. 276 * Set up initial_scrpos so we display that line. 277 */ 278 initial_scrpos.pos = tagsearch(); 279 if (initial_scrpos.pos == NULL_POSITION) 280 quit(QUIT_ERROR); 281 initial_scrpos.ln = jump_sline; 282 } else 283 #endif 284 if (nifile() == 0) 285 { 286 if (edit_stdin()) /* Edit standard input */ 287 quit(QUIT_ERROR); 288 if (quit_if_one_screen) 289 line_count = get_line_count(); 290 } else 291 { 292 if (edit_first()) /* Edit first valid file in cmd line */ 293 quit(QUIT_ERROR); 294 /* 295 * In case that we have only one file and -F, have to get a line 296 * count fot init(). If the line count is less then a height of a term, 297 * the content of the file is printed out and then less quits. Otherwise 298 * -F can not be used 299 */ 300 if (quit_if_one_screen) 301 { 302 if (nifile() == 1) 303 line_count = get_line_count(); 304 else /* In case more than one file, -F can not be used */ 305 quit_if_one_screen = FALSE; 306 } 307 } 308 309 init(); 310 commands(); 311 quit(QUIT_OK); 312 /*NOTREACHED*/ 313 return (0); 314 } 315 316 /* 317 * Copy a string to a "safe" place 318 * (that is, to a buffer allocated by calloc). 319 */ 320 public char * 321 save(s) 322 constant char *s; 323 { 324 char *p; 325 326 p = (char *) ecalloc(strlen(s)+1, sizeof(char)); 327 strcpy(p, s); 328 return (p); 329 } 330 331 /* 332 * Allocate memory. 333 * Like calloc(), but never returns an error (NULL). 334 */ 335 public VOID_POINTER 336 ecalloc(count, size) 337 int count; 338 unsigned int size; 339 { 340 VOID_POINTER p; 341 342 p = (VOID_POINTER) calloc(count, size); 343 if (p != NULL) 344 return (p); 345 error("Cannot allocate memory", NULL_PARG); 346 quit(QUIT_ERROR); 347 /*NOTREACHED*/ 348 return (NULL); 349 } 350 351 /* 352 * Skip leading spaces in a string. 353 */ 354 public char * 355 skipsp(s) 356 char *s; 357 { 358 while (*s == ' ' || *s == '\t') 359 s++; 360 return (s); 361 } 362 363 /* 364 * See how many characters of two strings are identical. 365 * If uppercase is true, the first string must begin with an uppercase 366 * character; the remainder of the first string may be either case. 367 */ 368 public int 369 sprefix(ps, s, uppercase) 370 char *ps; 371 char *s; 372 int uppercase; 373 { 374 int c; 375 int sc; 376 int len = 0; 377 378 for ( ; *s != '\0'; s++, ps++) 379 { 380 c = *ps; 381 if (uppercase) 382 { 383 if (len == 0 && ASCII_IS_LOWER(c)) 384 return (-1); 385 if (ASCII_IS_UPPER(c)) 386 c = ASCII_TO_LOWER(c); 387 } 388 sc = *s; 389 if (len > 0 && ASCII_IS_UPPER(sc)) 390 sc = ASCII_TO_LOWER(sc); 391 if (c != sc) 392 break; 393 len++; 394 } 395 return (len); 396 } 397 398 /* 399 * Exit the program. 400 */ 401 public void 402 quit(status) 403 int status; 404 { 405 static int save_status; 406 407 /* 408 * Put cursor at bottom left corner, clear the line, 409 * reset the terminal modes, and exit. 410 */ 411 if (status < 0) 412 status = save_status; 413 else 414 save_status = status; 415 quitting = 1; 416 edit((char*)NULL); 417 save_cmdhist(); 418 if (any_display && is_tty) 419 clear_bot(); 420 deinit(); 421 flush(); 422 raw_mode(0); 423 #if MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC 424 /* 425 * If we don't close 2, we get some garbage from 426 * 2's buffer when it flushes automatically. 427 * I cannot track this one down RB 428 * The same bug shows up if we use ^C^C to abort. 429 */ 430 close(2); 431 #endif 432 #ifdef WIN32 433 SetConsoleTitle(consoleTitle); 434 #endif 435 close_getchr(); 436 exit(status); 437 } 438