main.c revision 294286
1/* $FreeBSD: stable/10/contrib/less/main.c 294286 2016-01-18 19:13:54Z delphij $ */ 2/* 3 * Copyright (C) 1984-2015 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 21public char * every_first_cmd = NULL; 22public int new_file; 23public int is_tty; 24public IFILE curr_ifile = NULL_IFILE; 25public IFILE old_ifile = NULL_IFILE; 26public struct scrpos initial_scrpos; 27public int any_display = FALSE; 28public POSITION start_attnpos = NULL_POSITION; 29public POSITION end_attnpos = NULL_POSITION; 30public int wscroll; 31public char * progname; 32public int quitting; 33public int secure; 34public int dohelp; 35 36#if LOGFILE 37public int logfile = -1; 38public int force_logfile = FALSE; 39public char * namelogfile = NULL; 40#endif 41 42#if EDITOR 43public char * editor; 44public char * editproto; 45#endif 46 47#if TAGS 48extern char * tags; 49extern char * tagoption; 50extern int jump_sline; 51#endif 52 53#ifdef WIN32 54static char consoleTitle[256]; 55#endif 56 57extern int less_is_more; 58extern int missing_cap; 59extern int know_dumb; 60extern int no_init; 61extern int pr_type; 62 63 64/* 65 * Entry point. 66 */ 67int 68main(argc, argv) 69 int argc; 70 char *argv[]; 71{ 72 IFILE ifile; 73 char *s; 74 extern char *__progname; 75 76#ifdef __EMX__ 77 _response(&argc, &argv); 78 _wildcard(&argc, &argv); 79#endif 80 81 progname = *argv++; 82 argc--; 83 84 secure = 0; 85 s = lgetenv("LESSSECURE"); 86 if (s != NULL && *s != '\0') 87 secure = 1; 88 89#ifdef WIN32 90 if (getenv("HOME") == NULL) 91 { 92 /* 93 * If there is no HOME environment variable, 94 * try the concatenation of HOMEDRIVE + HOMEPATH. 95 */ 96 char *drive = getenv("HOMEDRIVE"); 97 char *path = getenv("HOMEPATH"); 98 if (drive != NULL && path != NULL) 99 { 100 char *env = (char *) ecalloc(strlen(drive) + 101 strlen(path) + 6, sizeof(char)); 102 strcpy(env, "HOME="); 103 strcat(env, drive); 104 strcat(env, path); 105 putenv(env); 106 } 107 } 108 GetConsoleTitle(consoleTitle, sizeof(consoleTitle)/sizeof(char)); 109#endif /* WIN32 */ 110 111 /* 112 * Process command line arguments and LESS environment arguments. 113 * Command line arguments override environment arguments. 114 */ 115 is_tty = isatty(1); 116 get_term(); 117 init_cmds(); 118 init_charset(); 119 init_line(); 120 init_cmdhist(); 121 init_option(); 122 init_search(); 123 124 /* 125 * If the name of the executable program is "more", 126 * act like LESS_IS_MORE is set. 127 */ 128 for (s = progname + strlen(progname); s > progname; s--) 129 { 130 if (s[-1] == PATHNAME_SEP[0]) 131 break; 132 } 133 if (strcmp(s, "more") == 0) 134 less_is_more = 1; 135 136 init_prompt(); 137 138 if (less_is_more) 139 scan_option("-fG"); 140 141 s = lgetenv(less_is_more ? "MORE" : "LESS"); 142 if (s != NULL) 143 scan_option(save(s)); 144 145#define isoptstring(s) less_is_more ? (((s)[0] == '-') && (s)[1] != '\0') : \ 146 (((s)[0] == '-' || (s)[0] == '+') && (s)[1] != '\0') 147 while (argc > 0 && (isoptstring(*argv) || isoptpending())) 148 { 149 s = *argv++; 150 argc--; 151 if (strcmp(s, "--") == 0) 152 break; 153 scan_option(s); 154 } 155#undef isoptstring 156 157 if (isoptpending()) 158 { 159 /* 160 * Last command line option was a flag requiring a 161 * following string, but there was no following string. 162 */ 163 nopendopt(); 164 quit(QUIT_OK); 165 } 166 167 if (less_is_more) 168 no_init = TRUE; 169 170#if EDITOR 171 editor = lgetenv("VISUAL"); 172 if (editor == NULL || *editor == '\0') 173 { 174 editor = lgetenv("EDITOR"); 175 if (editor == NULL || *editor == '\0') 176 editor = EDIT_PGM; 177 } 178 editproto = lgetenv("LESSEDIT"); 179 if (editproto == NULL || *editproto == '\0') 180 editproto = "%E ?lm+%lm. %f"; 181#endif 182 183 /* 184 * Call get_ifile with all the command line filenames 185 * to "register" them with the ifile system. 186 */ 187 ifile = NULL_IFILE; 188 if (dohelp) 189 ifile = get_ifile(FAKE_HELPFILE, ifile); 190 while (argc-- > 0) 191 { 192 char *filename; 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 *gfilename; 202 203 gfilename = lglob(*argv++); 204 init_textlist(&tlist, gfilename); 205 filename = NULL; 206 while ((filename = forw_textlist(&tlist, filename)) != NULL) 207 { 208 (void) get_ifile(filename, ifile); 209 ifile = prev_ifile(NULL_IFILE); 210 } 211 free(gfilename); 212#else 213 filename = shell_quote(*argv); 214 if (filename == NULL) 215 filename = *argv; 216 argv++; 217 (void) get_ifile(filename, ifile); 218 ifile = prev_ifile(NULL_IFILE); 219 free(filename); 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 && !less_is_more) 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 * 304save(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 319ecalloc(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 * 338skipsp(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 352sprefix(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 385quit(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#ifdef WIN32 416 SetConsoleTitle(consoleTitle); 417#endif 418 close_getchr(); 419 exit(status); 420} 421