1 /* $FreeBSD$ */ 2 /* 3 * Copyright (C) 1984-2000 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 * Prompting and other messages. 15 * There are three flavors of prompts, SHORT, MEDIUM and LONG, 16 * selected by the -m/-M options. 17 * There is also the "equals message", printed by the = command. 18 * A prompt is a message composed of various pieces, such as the 19 * name of the file being viewed, the percentage into the file, etc. 20 */ 21 22 #include "less.h" 23 #include "position.h" 24 25 extern int pr_type; 26 extern int hit_eof; 27 extern int new_file; 28 extern int sc_width; 29 extern int so_s_width, so_e_width; 30 extern int linenums; 31 extern int hshift; 32 extern int sc_height; 33 extern int jump_sline; 34 extern IFILE curr_ifile; 35 #if EDITOR 36 extern char *editor; 37 extern char *editproto; 38 #endif 39 40 /* 41 * Prototypes for the three flavors of prompts. 42 * These strings are expanded by pr_expand(). 43 */ 44 static constant char s_proto[] = 45 "?n?f%f .?m(file %i of %m) ..?e(END) ?x- Next\\: %x..%t"; 46 static constant char m_proto[] = 47 "?n?f%f .?m(file %i of %m) ..?e(END) ?x- Next\\: %x.:?pB%pB\\%:byte %bB?s/%s...%t"; 48 static constant char M_proto[] = 49 "?f%f .?n?m(file %i of %m) ..?ltlines %lt-%lb?L/%L. :byte %bB?s/%s. .?e(END) ?x- Next\\: %x.:?pB%pB\\%..%t"; 50 static constant char e_proto[] = 51 "?f%f .?m(file %i of %m) .?ltlines %lt-%lb?L/%L. .byte %bB?s/%s. ?e(END) :?pB%pB\\%..%t"; 52 static constant char h_proto[] = 53 "HELP -- ?eEND -- Press g to see it again:Press RETURN for more., or q when done"; 54 55 public char *prproto[3]; 56 public char constant *eqproto = e_proto; 57 public char constant *hproto = h_proto; 58 59 static char message[PROMPT_SIZE]; 60 static char *mp; 61 62 /* 63 * Initialize the prompt prototype strings. 64 */ 65 public void 66 init_prompt() 67 { 68 prproto[0] = save(s_proto); 69 prproto[1] = save(m_proto); 70 prproto[2] = save(M_proto); 71 eqproto = save(e_proto); 72 hproto = save(h_proto); 73 } 74 75 /* 76 * Append a string to the end of the message. 77 */ 78 static void 79 ap_str(s) 80 char *s; 81 { 82 int len; 83 84 len = strlen(s); 85 if (mp + len >= message + PROMPT_SIZE) 86 len = message + PROMPT_SIZE - mp - 1; 87 strncpy(mp, s, len); 88 mp += len; 89 *mp = '\0'; 90 } 91 92 /* 93 * Append a character to the end of the message. 94 */ 95 static void 96 ap_char(c) 97 char c; 98 { 99 char buf[2]; 100 101 buf[0] = c; 102 buf[1] = '\0'; 103 ap_str(buf); 104 } 105 106 /* 107 * Append a POSITION (as a decimal integer) to the end of the message. 108 */ 109 static void 110 ap_pos(pos) 111 POSITION pos; 112 { 113 char buf[MAX_PRINT_POSITION]; 114 115 sprintf(buf, PR_POSITION, (long long)pos); 116 ap_str(buf); 117 } 118 119 /* 120 * Append an integer to the end of the message. 121 */ 122 static void 123 ap_int(n) 124 int n; 125 { 126 char buf[MAX_PRINT_INT]; 127 128 sprintf(buf, "%d", n); 129 ap_str(buf); 130 } 131 132 /* 133 * Append a question mark to the end of the message. 134 */ 135 static void 136 ap_quest() 137 { 138 ap_str("?"); 139 } 140 141 /* 142 * Return the "current" byte offset in the file. 143 */ 144 static POSITION 145 curr_byte(where) 146 int where; 147 { 148 POSITION pos; 149 150 pos = position(where); 151 while (pos == NULL_POSITION && where >= 0 && where < sc_height) 152 pos = position(++where); 153 if (pos == NULL_POSITION) 154 pos = ch_length(); 155 return (pos); 156 } 157 158 /* 159 * Return the value of a prototype conditional. 160 * A prototype string may include conditionals which consist of a 161 * question mark followed by a single letter. 162 * Here we decode that letter and return the appropriate boolean value. 163 */ 164 static int 165 cond(c, where) 166 char c; 167 int where; 168 { 169 POSITION len; 170 171 switch (c) 172 { 173 case 'a': /* Anything in the message yet? */ 174 return (mp > message); 175 case 'b': /* Current byte offset known? */ 176 return (curr_byte(where) != NULL_POSITION); 177 case 'c': 178 return (hshift != 0); 179 case 'e': /* At end of file? */ 180 return (hit_eof); 181 case 'f': /* Filename known? */ 182 return (strcmp(get_filename(curr_ifile), "-") != 0); 183 case 'l': /* Line number known? */ 184 case 'd': /* Same as l */ 185 return (linenums); 186 case 'L': /* Final line number known? */ 187 case 'D': /* Same as L */ 188 return (linenums && ch_length() != NULL_POSITION); 189 case 'm': /* More than one file? */ 190 return (nifile() > 1); 191 case 'n': /* First prompt in a new file? */ 192 return (new_file); 193 case 'p': /* Percent into file (bytes) known? */ 194 return (curr_byte(where) != NULL_POSITION && 195 ch_length() > 0); 196 case 'P': /* Percent into file (lines) known? */ 197 return (currline(where) != 0 && 198 (len = ch_length()) > 0 && 199 find_linenum(len) != 0); 200 case 's': /* Size of file known? */ 201 case 'B': 202 return (ch_length() != NULL_POSITION); 203 case 'x': /* Is there a "next" file? */ 204 return (next_ifile(curr_ifile) != NULL_IFILE); 205 } 206 return (0); 207 } 208 209 /* 210 * Decode a "percent" prototype character. 211 * A prototype string may include various "percent" escapes; 212 * that is, a percent sign followed by a single letter. 213 * Here we decode that letter and take the appropriate action, 214 * usually by appending something to the message being built. 215 */ 216 static void 217 protochar(c, where, iseditproto) 218 int c; 219 int where; 220 int iseditproto; 221 { 222 POSITION pos; 223 POSITION len; 224 int n; 225 IFILE h; 226 char *s; 227 char *escs; 228 229 switch (c) 230 { 231 case 'b': /* Current byte offset */ 232 pos = curr_byte(where); 233 if (pos != NULL_POSITION) 234 ap_pos(pos); 235 else 236 ap_quest(); 237 break; 238 case 'c': 239 ap_int(hshift); 240 break; 241 case 'd': /* Current page number */ 242 n = currline(where); 243 if (n > 0 && sc_height > 1) 244 ap_int(((n - 1) / (sc_height - 1)) + 1); 245 else 246 ap_quest(); 247 break; 248 case 'D': /* Last page number */ 249 len = ch_length(); 250 if (len == NULL_POSITION || len == ch_zero() || 251 (n = find_linenum(len)) <= 0) 252 ap_quest(); 253 else 254 ap_int(((n - 1) / (sc_height - 1)) + 1); 255 break; 256 #if EDITOR 257 case 'E': /* Editor name */ 258 ap_str(editor); 259 break; 260 #endif 261 case 'f': /* File name */ 262 s = unquote_file(get_filename(curr_ifile)); 263 /* 264 * If we are expanding editproto then we escape metachars. 265 * This allows us to run the editor on files with funny names. 266 */ 267 if (iseditproto && (escs = esc_metachars(s)) != NULL) 268 { 269 free(s); 270 s = escs; 271 } 272 ap_str(s); 273 free(s); 274 break; 275 case 'i': /* Index into list of files */ 276 ap_int(get_index(curr_ifile)); 277 break; 278 case 'l': /* Current line number */ 279 n = currline(where); 280 if (n != 0) 281 ap_int(n); 282 else 283 ap_quest(); 284 break; 285 case 'L': /* Final line number */ 286 len = ch_length(); 287 if (len == NULL_POSITION || len == ch_zero() || 288 (n = find_linenum(len)) <= 0) 289 ap_quest(); 290 else 291 ap_int(n-1); 292 break; 293 case 'm': /* Number of files */ 294 ap_int(nifile()); 295 break; 296 case 'p': /* Percent into file (bytes) */ 297 pos = curr_byte(where); 298 len = ch_length(); 299 if (pos != NULL_POSITION && len > 0) 300 ap_int(percentage(pos,len)); 301 else 302 ap_quest(); 303 break; 304 case 'P': /* Percent into file (lines) */ 305 pos = (POSITION) currline(where); 306 if (pos == 0 || 307 (len = ch_length()) == NULL_POSITION || len == ch_zero() || 308 (n = find_linenum(len)) <= 0) 309 ap_quest(); 310 else 311 ap_int(percentage(pos, (POSITION)n)); 312 break; 313 case 's': /* Size of file */ 314 case 'B': 315 len = ch_length(); 316 if (len != NULL_POSITION) 317 ap_pos(len); 318 else 319 ap_quest(); 320 break; 321 case 't': /* Truncate trailing spaces in the message */ 322 while (mp > message && mp[-1] == ' ') 323 mp--; 324 break; 325 case 'x': /* Name of next file */ 326 h = next_ifile(curr_ifile); 327 if (h != NULL_IFILE) 328 { 329 s = unquote_file(get_filename(h)); 330 ap_str(s); 331 free(s); 332 } else 333 ap_quest(); 334 break; 335 } 336 } 337 338 /* 339 * Skip a false conditional. 340 * When a false condition is found (either a false IF or the ELSE part 341 * of a true IF), this routine scans the prototype string to decide 342 * where to resume parsing the string. 343 * We must keep track of nested IFs and skip them properly. 344 */ 345 static char * 346 skipcond(p) 347 register char *p; 348 { 349 register int iflevel; 350 351 /* 352 * We came in here after processing a ? or :, 353 * so we start nested one level deep. 354 */ 355 iflevel = 1; 356 357 for (;;) switch (*++p) 358 { 359 case '?': 360 /* 361 * Start of a nested IF. 362 */ 363 iflevel++; 364 break; 365 case ':': 366 /* 367 * Else. 368 * If this matches the IF we came in here with, 369 * then we're done. 370 */ 371 if (iflevel == 1) 372 return (p); 373 break; 374 case '.': 375 /* 376 * Endif. 377 * If this matches the IF we came in here with, 378 * then we're done. 379 */ 380 if (--iflevel == 0) 381 return (p); 382 break; 383 case '\\': 384 /* 385 * Backslash escapes the next character. 386 */ 387 ++p; 388 break; 389 case '\0': 390 /* 391 * Whoops. Hit end of string. 392 * This is a malformed conditional, but just treat it 393 * as if all active conditionals ends here. 394 */ 395 return (p-1); 396 } 397 /*NOTREACHED*/ 398 } 399 400 /* 401 * Decode a char that represents a position on the screen. 402 */ 403 static char * 404 wherechar(p, wp) 405 char *p; 406 int *wp; 407 { 408 switch (*p) 409 { 410 case 'b': case 'd': case 'l': case 'p': case 'P': 411 switch (*++p) 412 { 413 case 't': *wp = TOP; break; 414 case 'm': *wp = MIDDLE; break; 415 case 'b': *wp = BOTTOM; break; 416 case 'B': *wp = BOTTOM_PLUS_ONE; break; 417 case 'j': *wp = adjsline(jump_sline); break; 418 default: *wp = TOP; p--; break; 419 } 420 } 421 return (p); 422 } 423 424 /* 425 * Construct a message based on a prototype string. 426 */ 427 public char * 428 pr_expand(proto, maxwidth) 429 char *proto; 430 int maxwidth; 431 { 432 register char *p; 433 register int c; 434 int where; 435 436 mp = message; 437 438 if (*proto == '\0') 439 return (""); 440 441 for (p = proto; *p != '\0'; p++) 442 { 443 switch (*p) 444 { 445 default: /* Just put the character in the message */ 446 ap_char(*p); 447 break; 448 case '\\': /* Backslash escapes the next character */ 449 p++; 450 ap_char(*p); 451 break; 452 case '?': /* Conditional (IF) */ 453 if ((c = *++p) == '\0') 454 --p; 455 else 456 { 457 where = 0; 458 p = wherechar(p, &where); 459 if (!cond(c, where)) 460 p = skipcond(p); 461 } 462 break; 463 case ':': /* ELSE */ 464 p = skipcond(p); 465 break; 466 case '.': /* ENDIF */ 467 break; 468 case '%': /* Percent escape */ 469 if ((c = *++p) == '\0') 470 --p; 471 else 472 { 473 where = 0; 474 p = wherechar(p, &where); 475 protochar(c, where, 476 #if EDITOR 477 (proto == editproto)); 478 #else 479 0); 480 #endif 481 482 } 483 break; 484 } 485 } 486 487 new_file = 0; 488 if (mp == message) 489 return (NULL); 490 if (maxwidth > 0 && mp >= message + maxwidth) 491 { 492 /* 493 * Message is too long. 494 * Return just the final portion of it. 495 */ 496 return (mp - maxwidth); 497 } 498 return (message); 499 } 500 501 /* 502 * Return a message suitable for printing by the "=" command. 503 */ 504 public char * 505 eq_message() 506 { 507 return (pr_expand(eqproto, 0)); 508 } 509 510 /* 511 * Return a prompt. 512 * This depends on the prompt type (SHORT, MEDIUM, LONG), etc. 513 * If we can't come up with an appropriate prompt, return NULL 514 * and the caller will prompt with a colon. 515 */ 516 public char * 517 pr_string() 518 { 519 if (ch_getflags() & CH_HELPFILE) 520 return (pr_expand(hproto, sc_width-so_s_width-so_e_width-2)); 521 return (pr_expand(prproto[pr_type], sc_width-so_s_width-so_e_width-2)); 522 } 523