1 /* 2 * Copyright (C) 1984-2011 Mark Nudelman 3 * 4 * You may distribute under the terms of either the GNU General Public 5 * License or the Less License, as specified in the README file. 6 * 7 * For more information about less, or for information on how to 8 * contact the author, 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 extern int less_is_more; 58 extern int missing_cap; 59 extern int know_dumb; 60 extern int quit_if_one_screen; 61 extern int pr_type; 62 63 64 /* 65 * Entry point. 66 */ 67 int 68 main(argc, argv) 69 int argc; 70 char *argv[]; 71 { 72 IFILE ifile; 73 char *s; 74 75 #ifdef __EMX__ 76 _response(&argc, &argv); 77 _wildcard(&argc, &argv); 78 #endif 79 80 progname = *argv++; 81 argc--; 82 83 secure = 0; 84 s = lgetenv("LESSSECURE"); 85 if (s != NULL && *s != '\0') 86 secure = 1; 87 88 #ifdef WIN32 89 if (getenv("HOME") == NULL) 90 { 91 /* 92 * If there is no HOME environment variable, 93 * try the concatenation of HOMEDRIVE + HOMEPATH. 94 */ 95 char *drive = getenv("HOMEDRIVE"); 96 char *path = getenv("HOMEPATH"); 97 if (drive != NULL && path != NULL) 98 { 99 size_t len = strlen(drive) + strlen(path) + 6; 100 char *env = (char *) ecalloc(len, sizeof(char)); 101 strlcpy(env, "HOME=", len); 102 strlcat(env, drive, len); 103 strlcat(env, path, len); 104 putenv(env); 105 } 106 } 107 GetConsoleTitle(consoleTitle, sizeof(consoleTitle)/sizeof(char)); 108 #endif /* WIN32 */ 109 110 /* 111 * Process command line arguments and LESS environment arguments. 112 * Command line arguments override environment arguments. 113 */ 114 is_tty = isatty(1); 115 get_term(); 116 init_cmds(); 117 init_charset(); 118 init_line(); 119 init_cmdhist(); 120 init_option(); 121 init_search(); 122 123 /* 124 * If the name of the executable program is "more", 125 * act like LESS_IS_MORE is set. 126 */ 127 for (s = progname + strlen(progname); s > progname; s--) 128 { 129 if (s[-1] == PATHNAME_SEP[0]) 130 break; 131 } 132 if (strcmp(s, "more") == 0) 133 less_is_more = 1; 134 135 init_prompt(); 136 137 if (less_is_more) { 138 scan_option("-G"); 139 scan_option("-L"); 140 scan_option("-X"); 141 scan_option("-c"); 142 } 143 144 s = lgetenv(less_is_more ? "MORE" : "LESS"); 145 if (s != NULL) 146 scan_option(save(s)); 147 148 #define isoptstring(s) (((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 && get_quit_at_eof()) 170 quit_if_one_screen = 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 !SMALL 191 if (dohelp) 192 ifile = get_ifile(HELPFILE, ifile); 193 #endif /* !SMALL */ 194 while (argc-- > 0) 195 { 196 char *filename; 197 #if (MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC) 198 /* 199 * Because the "shell" doesn't expand filename patterns, 200 * treat each argument as a filename pattern rather than 201 * a single filename. 202 * Expand the pattern and iterate over the expanded list. 203 */ 204 struct textlist tlist; 205 char *gfilename; 206 207 gfilename = lglob(*argv++); 208 init_textlist(&tlist, gfilename); 209 filename = NULL; 210 while ((filename = forw_textlist(&tlist, filename)) != NULL) 211 { 212 (void) get_ifile(filename, ifile); 213 ifile = prev_ifile(NULL_IFILE); 214 } 215 free(gfilename); 216 #else 217 filename = shell_quote(*argv); 218 if (filename == NULL) 219 filename = *argv; 220 argv++; 221 (void) get_ifile(filename, ifile); 222 ifile = prev_ifile(NULL_IFILE); 223 #endif 224 } 225 /* 226 * Set up terminal, etc. 227 */ 228 if (!is_tty) 229 { 230 /* 231 * Output is not a tty. 232 * Just copy the input file(s) to output. 233 */ 234 SET_BINARY(1); 235 if (nifile() == 0) 236 { 237 if (edit_stdin() == 0) 238 cat_file(); 239 } else if (edit_first() == 0) 240 { 241 do { 242 cat_file(); 243 } while (edit_next(1) == 0); 244 } 245 quit(QUIT_OK); 246 } 247 248 if (missing_cap && !know_dumb && !less_is_more) 249 error("WARNING: terminal is not fully functional", NULL_PARG); 250 init_mark(); 251 open_getchr(); 252 raw_mode(1); 253 init_signals(1); 254 255 /* 256 * Select the first file to examine. 257 */ 258 #if TAGS 259 if (tagoption != NULL || strcmp(tags, "-") == 0) 260 { 261 /* 262 * A -t option was given. 263 * Verify that no filenames were also given. 264 * Edit the file selected by the "tags" search, 265 * and search for the proper line in the file. 266 */ 267 if (nifile() > 0) 268 { 269 error("No filenames allowed with -t option", NULL_PARG); 270 quit(QUIT_ERROR); 271 } 272 findtag(tagoption); 273 if (edit_tagfile()) /* Edit file which contains the tag */ 274 quit(QUIT_ERROR); 275 /* 276 * Search for the line which contains the tag. 277 * Set up initial_scrpos so we display that line. 278 */ 279 initial_scrpos.pos = tagsearch(); 280 if (initial_scrpos.pos == NULL_POSITION) 281 quit(QUIT_ERROR); 282 initial_scrpos.ln = jump_sline; 283 } else 284 #endif 285 if (nifile() == 0) 286 { 287 if (edit_stdin()) /* Edit standard input */ 288 quit(QUIT_ERROR); 289 } else 290 { 291 if (edit_first()) /* Edit first valid file in cmd line */ 292 quit(QUIT_ERROR); 293 } 294 295 init(); 296 commands(); 297 quit(QUIT_OK); 298 /*NOTREACHED*/ 299 return (0); 300 } 301 302 /* 303 * Copy a string to a "safe" place 304 * (that is, to a buffer allocated by calloc). 305 */ 306 public char * 307 save(s) 308 char *s; 309 { 310 register char *p; 311 size_t len = strlen(s) + 1; 312 313 p = (char *) ecalloc(len, sizeof(char)); 314 strlcpy(p, s, len); 315 return (p); 316 } 317 318 /* 319 * Allocate memory. 320 * Like calloc(), but never returns an error (NULL). 321 */ 322 public VOID_POINTER 323 ecalloc(count, size) 324 int count; 325 unsigned int size; 326 { 327 register VOID_POINTER p; 328 329 p = (VOID_POINTER) calloc(count, size); 330 if (p != NULL) 331 return (p); 332 error("Cannot allocate memory", NULL_PARG); 333 quit(QUIT_ERROR); 334 /*NOTREACHED*/ 335 return (NULL); 336 } 337 338 /* 339 * Skip leading spaces in a string. 340 */ 341 public char * 342 skipsp(s) 343 register char *s; 344 { 345 while (*s == ' ' || *s == '\t') 346 s++; 347 return (s); 348 } 349 350 #if GNU_OPTIONS 351 /* 352 * See how many characters of two strings are identical. 353 * If uppercase is true, the first string must begin with an uppercase 354 * character; the remainder of the first string may be either case. 355 */ 356 public int 357 sprefix(ps, s, uppercase) 358 char *ps; 359 char *s; 360 int uppercase; 361 { 362 register int c; 363 register int sc; 364 register int len = 0; 365 366 for ( ; *s != '\0'; s++, ps++) 367 { 368 c = *ps; 369 if (uppercase) 370 { 371 if (len == 0 && ASCII_IS_LOWER(c)) 372 return (-1); 373 if (ASCII_IS_UPPER(c)) 374 c = ASCII_TO_LOWER(c); 375 } 376 sc = *s; 377 if (len > 0 && ASCII_IS_UPPER(sc)) 378 sc = ASCII_TO_LOWER(sc); 379 if (c != sc) 380 break; 381 len++; 382 } 383 return (len); 384 } 385 #endif /* GNU_OPTIONS */ 386 387 /* 388 * Exit the program. 389 */ 390 public void 391 quit(status) 392 int status; 393 { 394 static int save_status; 395 396 /* 397 * Put cursor at bottom left corner, clear the line, 398 * reset the terminal modes, and exit. 399 */ 400 if (status < 0) 401 status = save_status; 402 else 403 save_status = status; 404 quitting = 1; 405 edit((char*)NULL); 406 save_cmdhist(); 407 if (any_display && is_tty) 408 clear_bot(); 409 deinit(); 410 flush(); 411 raw_mode(0); 412 #if MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC 413 /* 414 * If we don't close 2, we get some garbage from 415 * 2's buffer when it flushes automatically. 416 * I cannot track this one down RB 417 * The same bug shows up if we use ^C^C to abort. 418 */ 419 close(2); 420 #endif 421 #ifdef WIN32 422 SetConsoleTitle(consoleTitle); 423 #endif 424 close_getchr(); 425 exit(status); 426 } 427