1 /* $FreeBSD$ */ 2 /* 3 * Copyright (C) 1984-2007 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 about less, or for information on how to 9 * contact the author, see the README file. 10 */ 11 12 13 /* 14 * Entry point, initialization, miscellaneous routines. 15 */ 16 17 #include "less.h" 18 #if MSDOS_COMPILER==WIN32C 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 public int less_is_more; 37 38 #if LOGFILE 39 public int logfile = -1; 40 public int force_logfile = FALSE; 41 public char * namelogfile = NULL; 42 #endif 43 44 #if EDITOR 45 public char * editor; 46 public char * editproto; 47 #endif 48 49 #if TAGS 50 extern char * tags; 51 extern char * tagoption; 52 extern int jump_sline; 53 #endif 54 55 #ifdef WIN32 56 static char consoleTitle[256]; 57 #endif 58 59 extern int missing_cap; 60 extern int know_dumb; 61 extern int quit_if_one_screen; 62 extern int no_init; 63 extern int pr_type; 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(); 124 125 /* 126 * If the name of the executable program is "more", 127 * act like LESS_IS_MORE is set. 128 */ 129 for (s = progname + strlen(progname); s > progname; s--) 130 { 131 if (s[-1] == PATHNAME_SEP[0]) 132 break; 133 } 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 && get_quit_at_eof()) 169 no_init = quit_if_one_screen = TRUE; 170 171 #if EDITOR 172 editor = lgetenv("VISUAL"); 173 if (editor == NULL || *editor == '\0') 174 { 175 editor = lgetenv("EDITOR"); 176 if (editor == NULL || *editor == '\0') 177 editor = EDIT_PGM; 178 } 179 editproto = lgetenv("LESSEDIT"); 180 if (editproto == NULL || *editproto == '\0') 181 editproto = "%E ?lm+%lm. %f"; 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 char *filename; 194 #if (MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC) 195 /* 196 * Because the "shell" doesn't expand filename patterns, 197 * treat each argument as a filename pattern rather than 198 * a single filename. 199 * Expand the pattern and iterate over the expanded list. 200 */ 201 struct textlist tlist; 202 char *gfilename; 203 204 gfilename = lglob(*argv++); 205 init_textlist(&tlist, gfilename); 206 filename = NULL; 207 while ((filename = forw_textlist(&tlist, filename)) != NULL) 208 { 209 (void) get_ifile(filename, ifile); 210 ifile = prev_ifile(NULL_IFILE); 211 } 212 free(gfilename); 213 #else 214 filename = shell_quote(*argv); 215 if (filename == NULL) 216 filename = *argv; 217 argv++; 218 (void) get_ifile(filename, ifile); 219 ifile = prev_ifile(NULL_IFILE); 220 #endif 221 } 222 /* 223 * Set up terminal, etc. 224 */ 225 if (!is_tty) 226 { 227 /* 228 * Output is not a tty. 229 * Just copy the input file(s) to output. 230 */ 231 SET_BINARY(1); 232 if (nifile() == 0) 233 { 234 if (edit_stdin() == 0) 235 cat_file(); 236 } else if (edit_first() == 0) 237 { 238 do { 239 cat_file(); 240 } while (edit_next(1) == 0); 241 } 242 quit(QUIT_OK); 243 } 244 245 if (missing_cap && !know_dumb) 246 error("WARNING: terminal is not fully functional", NULL_PARG); 247 init_mark(); 248 open_getchr(); 249 raw_mode(1); 250 init_signals(1); 251 252 /* 253 * Select the first file to examine. 254 */ 255 #if TAGS 256 if (tagoption != NULL || strcmp(tags, "-") == 0) 257 { 258 /* 259 * A -t option was given. 260 * Verify that no filenames were also given. 261 * Edit the file selected by the "tags" search, 262 * and search for the proper line in the file. 263 */ 264 if (nifile() > 0) 265 { 266 error("No filenames allowed with -t option", NULL_PARG); 267 quit(QUIT_ERROR); 268 } 269 findtag(tagoption); 270 if (edit_tagfile()) /* Edit file which contains the tag */ 271 quit(QUIT_ERROR); 272 /* 273 * Search for the line which contains the tag. 274 * Set up initial_scrpos so we display that line. 275 */ 276 initial_scrpos.pos = tagsearch(); 277 if (initial_scrpos.pos == NULL_POSITION) 278 quit(QUIT_ERROR); 279 initial_scrpos.ln = jump_sline; 280 } else 281 #endif 282 if (nifile() == 0) 283 { 284 if (edit_stdin()) /* Edit standard input */ 285 quit(QUIT_ERROR); 286 } else 287 { 288 if (edit_first()) /* Edit first valid file in cmd line */ 289 quit(QUIT_ERROR); 290 } 291 292 init(); 293 commands(); 294 quit(QUIT_OK); 295 /*NOTREACHED*/ 296 return (0); 297 } 298 299 /* 300 * Copy a string to a "safe" place 301 * (that is, to a buffer allocated by calloc). 302 */ 303 public char * 304 save(s) 305 char *s; 306 { 307 register char *p; 308 309 p = (char *) ecalloc(strlen(s)+1, sizeof(char)); 310 strcpy(p, s); 311 return (p); 312 } 313 314 /* 315 * Allocate memory. 316 * Like calloc(), but never returns an error (NULL). 317 */ 318 public VOID_POINTER 319 ecalloc(count, size) 320 int count; 321 unsigned int size; 322 { 323 register VOID_POINTER p; 324 325 p = (VOID_POINTER) calloc(count, size); 326 if (p != NULL) 327 return (p); 328 error("Cannot allocate memory", NULL_PARG); 329 quit(QUIT_ERROR); 330 /*NOTREACHED*/ 331 return (NULL); 332 } 333 334 /* 335 * Skip leading spaces in a string. 336 */ 337 public char * 338 skipsp(s) 339 register char *s; 340 { 341 while (*s == ' ' || *s == '\t') 342 s++; 343 return (s); 344 } 345 346 /* 347 * See how many characters of two strings are identical. 348 * If uppercase is true, the first string must begin with an uppercase 349 * character; the remainder of the first string may be either case. 350 */ 351 public int 352 sprefix(ps, s, uppercase) 353 char *ps; 354 char *s; 355 int uppercase; 356 { 357 register int c; 358 register int sc; 359 register int len = 0; 360 361 for ( ; *s != '\0'; s++, ps++) 362 { 363 c = *ps; 364 if (uppercase) 365 { 366 if (len == 0 && ASCII_IS_LOWER(c)) 367 return (-1); 368 if (ASCII_IS_UPPER(c)) 369 c = ASCII_TO_LOWER(c); 370 } 371 sc = *s; 372 if (len > 0 && ASCII_IS_UPPER(sc)) 373 sc = ASCII_TO_LOWER(sc); 374 if (c != sc) 375 break; 376 len++; 377 } 378 return (len); 379 } 380 381 /* 382 * Exit the program. 383 */ 384 public void 385 quit(status) 386 int status; 387 { 388 static int save_status; 389 390 /* 391 * Put cursor at bottom left corner, clear the line, 392 * reset the terminal modes, and exit. 393 */ 394 if (status < 0) 395 status = save_status; 396 else 397 save_status = status; 398 quitting = 1; 399 edit((char*)NULL); 400 save_cmdhist(); 401 if (any_display && is_tty) 402 clear_bot(); 403 deinit(); 404 flush(); 405 raw_mode(0); 406 #if MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC 407 /* 408 * If we don't close 2, we get some garbage from 409 * 2's buffer when it flushes automatically. 410 * I cannot track this one down RB 411 * The same bug shows up if we use ^C^C to abort. 412 */ 413 close(2); 414 #endif 415 #if WIN32 416 SetConsoleTitle(consoleTitle); 417 #endif 418 close_getchr(); 419 exit(status); 420 } 421