1 /* 2 * Copyright (C) 1984-2000 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 * The option table. 14 */ 15 16 #include "less.h" 17 #include "option.h" 18 19 /* 20 * Variables controlled by command line options. 21 */ 22 public int quiet; /* Should we suppress the audible bell? */ 23 public int how_search; /* Where should forward searches start? */ 24 public int top_scroll; /* Repaint screen from top? 25 (alternative is scroll from bottom) */ 26 public int pr_type; /* Type of prompt (short, medium, long) */ 27 public int bs_mode; /* How to process backspaces */ 28 public int know_dumb; /* Don't complain about dumb terminals */ 29 public int quit_at_eof; /* Quit after hitting end of file twice */ 30 public int quit_if_one_screen; /* Quit if EOF on first screen */ 31 public int squeeze; /* Squeeze multiple blank lines into one */ 32 public int tabstop; /* Tab settings */ 33 public int back_scroll; /* Repaint screen on backwards movement */ 34 public int forw_scroll; /* Repaint screen on forward movement */ 35 public int caseless; /* Do "caseless" searches */ 36 public int linenums; /* Use line numbers */ 37 public int cbufs; /* Current number of buffers */ 38 public int autobuf; /* Automatically allocate buffers as needed */ 39 public int ctldisp; /* Send control chars to screen untranslated */ 40 public int force_open; /* Open the file even if not regular file */ 41 public int swindow; /* Size of scrolling window */ 42 public int jump_sline; /* Screen line of "jump target" */ 43 public int chopline; /* Truncate displayed lines at screen width */ 44 public int no_init; /* Disable sending ti/te termcap strings */ 45 public int twiddle; /* Show tildes after EOF */ 46 public int show_attn; /* Hilite first unread line */ 47 #if HILITE_SEARCH 48 public int hilite_search; /* Highlight matched search patterns? */ 49 #endif 50 51 /* 52 * Long option names. 53 */ 54 static struct optname a_optname = { "search-skip-screen", NULL }; 55 static struct optname b_optname = { "buffers", NULL }; 56 static struct optname B__optname = { "auto-buffers", NULL }; 57 static struct optname c_optname = { "clear-screen", NULL }; 58 static struct optname d_optname = { "dumb", NULL }; 59 #if MSDOS_COMPILER 60 static struct optname D__optname = { "color", NULL }; 61 #endif 62 static struct optname e_optname = { "quit-at-eof", NULL }; 63 static struct optname f_optname = { "force", NULL }; 64 static struct optname F__optname = { "quit-if-one-screen", NULL }; 65 #if HILITE_SEARCH 66 static struct optname g_optname = { "hilite-search", NULL }; 67 #endif 68 static struct optname h_optname = { "max-back-scroll", NULL }; 69 static struct optname i_optname = { "ignore-case", NULL }; 70 static struct optname j_optname = { "jump-target", NULL }; 71 #if USERFILE 72 static struct optname k_optname = { "lesskey-file", NULL }; 73 #endif 74 static struct optname m_optname = { "long-prompt", NULL }; 75 static struct optname n_optname = { "line-numbers", NULL }; 76 #if LOGFILE 77 static struct optname o_optname = { "log-file", NULL }; 78 static struct optname O__optname = { "LOG-FILE", NULL }; 79 #endif 80 static struct optname p_optname = { "pattern", NULL }; 81 static struct optname P__optname = { "prompt", NULL }; 82 static struct optname q2_optname = { "silent", NULL }; 83 static struct optname q_optname = { "quiet", &q2_optname }; 84 static struct optname r_optname = { "raw-control-chars", NULL }; 85 static struct optname s_optname = { "squeeze-blank-lines", NULL }; 86 static struct optname S__optname = { "chop-long-lines", NULL }; 87 #if TAGS 88 static struct optname t_optname = { "tag", NULL }; 89 static struct optname T__optname = { "tag-file", NULL }; 90 #endif 91 static struct optname u_optname = { "underline-special", NULL }; 92 static struct optname V__optname = { "version", NULL }; 93 static struct optname w_optname = { "hilite-unread", NULL }; 94 static struct optname x_optname = { "tabs", NULL }; 95 static struct optname X__optname = { "no-init", NULL }; 96 static struct optname y_optname = { "max-forw-scroll", NULL }; 97 static struct optname z_optname = { "window", NULL }; 98 static struct optname quote_optname = { "quotes", NULL }; 99 static struct optname tilde_optname = { "tilde", NULL }; 100 static struct optname query_optname = { "help", NULL }; 101 102 103 /* 104 * Table of all options and their semantics. 105 */ 106 static struct option option[] = 107 { 108 { 'a', &a_optname, 109 BOOL, OPT_OFF, &how_search, NULL, 110 "Search includes displayed screen", 111 "Search skips displayed screen", 112 NULL 113 }, 114 115 { 'b', &b_optname, 116 NUMBER, 10, &cbufs, opt_b, 117 "Buffers: ", 118 "%d buffers", 119 NULL 120 }, 121 { 'B', &B__optname, 122 BOOL, OPT_ON, &autobuf, NULL, 123 "Don't automatically allocate buffers", 124 "Automatically allocate buffers when needed", 125 NULL 126 }, 127 { 'c', &c_optname, 128 TRIPLE, OPT_OFF, &top_scroll, NULL, 129 "Repaint by scrolling from bottom of screen", 130 "Repaint by clearing each line", 131 "Repaint by painting from top of screen" 132 }, 133 { 'd', &d_optname, 134 BOOL|NO_TOGGLE, OPT_OFF, &know_dumb, NULL, 135 "Assume intelligent terminal", 136 "Assume dumb terminal", 137 NULL 138 }, 139 #if MSDOS_COMPILER 140 { 'D', &D__optname, 141 STRING|REPAINT|NO_QUERY, 0, NULL, opt_D, 142 "color desc: ", NULL, NULL 143 }, 144 #endif 145 { 'e', &e_optname, 146 TRIPLE, OPT_OFF, &quit_at_eof, NULL, 147 "Don't quit at end-of-file", 148 "Quit at end-of-file", 149 "Quit immediately at end-of-file" 150 }, 151 { 'f', &f_optname, 152 BOOL, OPT_OFF, &force_open, NULL, 153 "Open only regular files", 154 "Open even non-regular files", 155 NULL 156 }, 157 { 'F', &F__optname, 158 BOOL, OPT_OFF, &quit_if_one_screen, NULL, 159 "Don't quit if end-of-file on first screen", 160 "Quit if end-of-file on first screen", 161 NULL 162 }, 163 #if HILITE_SEARCH 164 { 'g', &g_optname, 165 TRIPLE|HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL, 166 "Don't highlight search matches", 167 "Highlight matches for previous search only", 168 "Highlight all matches for previous search pattern", 169 }, 170 #endif 171 { 'h', &h_optname, 172 NUMBER, -1, &back_scroll, NULL, 173 "Backwards scroll limit: ", 174 "Backwards scroll limit is %d lines", 175 NULL 176 }, 177 { 'i', &i_optname, 178 TRIPLE|HL_REPAINT, OPT_OFF, &caseless, opt_i, 179 "Case is significant in searches", 180 "Ignore case in searches", 181 "Ignore case in searches and in patterns" 182 }, 183 { 'j', &j_optname, 184 NUMBER, 1, &jump_sline, NULL, 185 "Target line: ", 186 "Position target at screen line %d", 187 NULL 188 }, 189 #if USERFILE 190 { 'k', &k_optname, 191 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_k, 192 NULL, NULL, NULL 193 }, 194 #endif 195 { 'l', NULL, 196 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_l, 197 NULL, NULL, NULL 198 }, 199 { 'm', &m_optname, 200 TRIPLE, OPT_OFF, &pr_type, NULL, 201 "Short prompt", 202 "Medium prompt", 203 "Long prompt" 204 }, 205 { 'n', &n_optname, 206 TRIPLE|REPAINT, OPT_ON, &linenums, NULL, 207 "Don't use line numbers", 208 "Use line numbers", 209 "Constantly display line numbers" 210 }, 211 #if LOGFILE 212 { 'o', &o_optname, 213 STRING, 0, NULL, opt_o, 214 "log file: ", NULL, NULL 215 }, 216 { 'O', &O__optname, 217 STRING, 0, NULL, opt__O, 218 "Log file: ", NULL, NULL 219 }, 220 #endif 221 { 'p', &p_optname, 222 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_p, 223 NULL, NULL, NULL 224 }, 225 { 'P', &P__optname, 226 STRING, 0, NULL, opt__P, 227 "prompt: ", NULL, NULL 228 }, 229 { 'q', &q_optname, 230 TRIPLE, OPT_OFF, &quiet, NULL, 231 "Ring the bell for errors AND at eof/bof", 232 "Ring the bell for errors but not at eof/bof", 233 "Never ring the bell" 234 }, 235 { 'r', &r_optname, 236 TRIPLE|REPAINT, OPT_OFF, &ctldisp, NULL, 237 "Display control characters as ^X", 238 "Display control characters directly", 239 "Display control characters directly, processing ANSI sequences" 240 }, 241 { 's', &s_optname, 242 BOOL|REPAINT, OPT_OFF, &squeeze, NULL, 243 "Display all blank lines", 244 "Squeeze multiple blank lines", 245 NULL 246 }, 247 { 'S', &S__optname, 248 BOOL|REPAINT, OPT_OFF, &chopline, NULL, 249 "Fold long lines", 250 "Chop long lines", 251 NULL 252 }, 253 #if TAGS 254 { 't', &t_optname, 255 STRING|NO_QUERY, 0, NULL, opt_t, 256 "tag: ", NULL, NULL 257 }, 258 { 'T', &T__optname, 259 STRING, 0, NULL, opt__T, 260 "tags file: ", NULL, NULL 261 }, 262 #endif 263 { 'u', &u_optname, 264 TRIPLE|REPAINT, OPT_OFF, &bs_mode, NULL, 265 "Display underlined text in underline mode", 266 "Backspaces cause overstrike", 267 "Print backspace as ^H" 268 }, 269 { 'V', &V__optname, 270 NOVAR, 0, NULL, opt__V, 271 NULL, NULL, NULL 272 }, 273 { 'w', &w_optname, 274 TRIPLE|REPAINT, OPT_OFF, &show_attn, NULL, 275 "Don't highlight first unread line", 276 "Highlight first unread line after forward-screen", 277 "Highlight first unread line after any forward movement", 278 }, 279 { 'x', &x_optname, 280 NUMBER|REPAINT, 8, &tabstop, NULL, 281 "Tab stops: ", 282 "Tab stops every %d spaces", 283 NULL 284 }, 285 { 'X', &X__optname, 286 BOOL|NO_TOGGLE, OPT_OFF, &no_init, NULL, 287 "Send init/deinit strings to terminal", 288 "Don't use init/deinit strings", 289 NULL 290 }, 291 { 'y', &y_optname, 292 NUMBER, -1, &forw_scroll, NULL, 293 "Forward scroll limit: ", 294 "Forward scroll limit is %d lines", 295 NULL 296 }, 297 { 'z', &z_optname, 298 NUMBER, -1, &swindow, NULL, 299 "Scroll window size: ", 300 "Scroll window size is %d lines", 301 NULL 302 }, 303 { '"', "e_optname, 304 STRING, 0, NULL, opt_quote, 305 "quotes: ", NULL, NULL 306 }, 307 { '~', &tilde_optname, 308 BOOL|REPAINT, OPT_ON, &twiddle, NULL, 309 "Don't show tildes after end of file", 310 "Show tildes after end of file", 311 NULL 312 }, 313 { '?', &query_optname, 314 NOVAR, 0, NULL, opt_query, 315 NULL, NULL, NULL 316 }, 317 { '\0', NULL, NOVAR, 0, NULL, NULL, NULL, NULL, NULL } 318 }; 319 320 321 /* 322 * Initialize each option to its default value. 323 */ 324 public void 325 init_option() 326 { 327 register struct option *o; 328 329 for (o = option; o->oletter != '\0'; o++) 330 { 331 /* 332 * Set each variable to its default. 333 */ 334 if (o->ovar != NULL) 335 *(o->ovar) = o->odefault; 336 } 337 } 338 339 /* 340 * Find an option in the option table, given its option letter. 341 */ 342 public struct option * 343 findopt(c) 344 int c; 345 { 346 register struct option *o; 347 348 for (o = option; o->oletter != '\0'; o++) 349 { 350 if (o->oletter == c) 351 return (o); 352 if ((o->otype & TRIPLE) && toupper(o->oletter) == c) 353 return (o); 354 } 355 return (NULL); 356 } 357 358 /* 359 * Find an option in the option table, given its option name. 360 * p_optname is the (possibly partial) name to look for, and 361 * is updated to point after the matched name. 362 * p_oname if non-NULL is set to point to the full option name. 363 */ 364 public struct option * 365 findopt_name(p_optname, p_oname, p_err) 366 char **p_optname; 367 char **p_oname; 368 int *p_err; 369 { 370 char *optname = *p_optname; 371 register struct option *o; 372 register struct optname *oname; 373 register int len; 374 int uppercase; 375 struct option *maxo = NULL; 376 struct optname *maxoname = NULL; 377 int maxlen = 0; 378 int ambig = 0; 379 int exact = 0; 380 381 /* 382 * Check all options. 383 */ 384 for (o = option; o->oletter != '\0'; o++) 385 { 386 /* 387 * Check all names for this option. 388 */ 389 for (oname = o->onames; oname != NULL; oname = oname->onext) 390 { 391 /* 392 * Try normal match first (uppercase == 0), 393 * then, then if it's a TRIPLE option, 394 * try uppercase match (uppercase == 1). 395 */ 396 for (uppercase = 0; uppercase <= 1; uppercase++) 397 { 398 len = sprefix(optname, oname->oname, uppercase); 399 if (!exact && len == maxlen) 400 /* 401 * Already had a partial match, 402 * and now there's another one that 403 * matches the same length. 404 */ 405 ambig = 1; 406 else if (len > maxlen) 407 { 408 /* 409 * Found a better match than 410 * the one we had. 411 */ 412 maxo = o; 413 maxoname = oname; 414 maxlen = len; 415 ambig = 0; 416 exact = (len == strlen(oname->oname)); 417 } 418 if (!(o->otype & TRIPLE)) 419 break; 420 } 421 } 422 } 423 if (ambig) 424 { 425 /* 426 * Name matched more than one option. 427 */ 428 if (p_err != NULL) 429 *p_err = OPT_AMBIG; 430 return (NULL); 431 } 432 *p_optname = optname + maxlen; 433 if (p_oname != NULL) 434 *p_oname = maxoname->oname; 435 return (maxo); 436 } 437