1/* $NetBSD: input.c,v 1.39 2003/08/07 09:05:32 agc Exp $ */ 2 3/*- 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Kenneth Almquist. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35#include <sys/cdefs.h> 36#ifndef lint 37#if 0 38static char sccsid[] = "@(#)input.c 8.3 (Berkeley) 6/9/95"; 39#else 40__RCSID("$NetBSD: input.c,v 1.39 2003/08/07 09:05:32 agc Exp $"); 41#endif 42#endif /* not lint */ 43 44#include <stdio.h> /* defines BUFSIZ */ 45#include <fcntl.h> 46#include <errno.h> 47#include <unistd.h> 48#include <stdlib.h> 49#include <string.h> 50 51/* 52 * This file implements the input routines used by the parser. 53 */ 54 55#include "shell.h" 56#include "redir.h" 57#include "syntax.h" 58#include "input.h" 59#include "output.h" 60#include "options.h" 61#include "memalloc.h" 62#include "error.h" 63#include "alias.h" 64#include "parser.h" 65#include "myhistedit.h" 66 67#ifdef WITH_LINENOISE 68#include "linenoise.h" 69#endif 70 71#define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */ 72 73MKINIT 74struct strpush { 75 struct strpush *prev; /* preceding string on stack */ 76 char *prevstring; 77 int prevnleft; 78 int prevlleft; 79 struct alias *ap; /* if push was associated with an alias */ 80}; 81 82/* 83 * The parsefile structure pointed to by the global variable parsefile 84 * contains information about the current file being read. 85 */ 86 87MKINIT 88struct parsefile { 89 struct parsefile *prev; /* preceding file on stack */ 90 int linno; /* current line */ 91 int fd; /* file descriptor (or -1 if string) */ 92 int nleft; /* number of chars left in this line */ 93 int lleft; /* number of chars left in this buffer */ 94 char *nextc; /* next char in buffer */ 95 char *buf; /* input buffer */ 96 struct strpush *strpush; /* for pushing strings at this level */ 97 struct strpush basestrpush; /* so pushing one is fast */ 98}; 99 100 101int plinno = 1; /* input line number */ 102int parsenleft; /* copy of parsefile->nleft */ 103MKINIT int parselleft; /* copy of parsefile->lleft */ 104char *parsenextc; /* copy of parsefile->nextc */ 105MKINIT struct parsefile basepf; /* top level input file */ 106MKINIT char basebuf[BUFSIZ]; /* buffer for top level input file */ 107struct parsefile *parsefile = &basepf; /* current input file */ 108int init_editline = 0; /* editline library initialized? */ 109int whichprompt; /* 1 == PS1, 2 == PS2 */ 110 111#if WITH_HISTORY 112EditLine *el; /* cookie for editline package */ 113#endif 114 115STATIC void pushfile(void); 116static int preadfd(void); 117 118#ifdef mkinit 119INCLUDE <stdio.h> 120INCLUDE "input.h" 121INCLUDE "error.h" 122 123INIT { 124 basepf.nextc = basepf.buf = basebuf; 125} 126 127RESET { 128 if (exception != EXSHELLPROC) 129 parselleft = parsenleft = 0; /* clear input buffer */ 130 popallfiles(); 131} 132 133SHELLPROC { 134 popallfiles(); 135} 136#endif 137 138 139/* 140 * Read a line from the script. 141 */ 142 143char * 144pfgets(char *line, int len) 145{ 146 char *p = line; 147 int nleft = len; 148 int c; 149 150 while (--nleft > 0) { 151 c = pgetc_macro(); 152 if (c == PEOF) { 153 if (p == line) 154 return NULL; 155 break; 156 } 157 *p++ = c; 158 if (c == '\n') 159 break; 160 } 161 *p = '\0'; 162 return line; 163} 164 165 166 167/* 168 * Read a character from the script, returning PEOF on end of file. 169 * Nul characters in the input are silently discarded. 170 */ 171 172int 173pgetc(void) 174{ 175 return pgetc_macro(); 176} 177 178int in_interactive_mode() { 179 return parsefile != NULL && parsefile->fd == 0; 180} 181 182static int 183preadfd(void) 184{ 185 int nr; 186 char *buf = parsefile->buf; 187 parsenextc = buf; 188 189retry: 190#ifdef WITH_HISTORY 191 if (parsefile->fd == 0 && el) { 192 static const char *rl_cp; 193 static int el_len; 194 195 if (rl_cp == NULL) 196 rl_cp = el_gets(el, &el_len); 197 if (rl_cp == NULL) 198 nr = 0; 199 else { 200 nr = el_len; 201 if (nr > BUFSIZ - 8) 202 nr = BUFSIZ - 8; 203 memcpy(buf, rl_cp, nr); 204 if (nr != el_len) { 205 el_len -= nr; 206 rl_cp += nr; 207 } else 208 rl_cp = 0; 209 } 210 211 } else 212#endif 213#ifdef WITH_LINENOISE 214 if (parsefile->fd == 0) { 215 static char *rl_start; 216 static const char *rl_cp; 217 static int el_len; 218 219 if (rl_cp == NULL) { 220 rl_cp = rl_start = linenoise(getprompt("")); 221 if (rl_cp != NULL) { 222 el_len = strlen(rl_start); 223 if (el_len != 0) { 224 /* Add non-blank lines to history. */ 225 linenoiseHistoryAdd(rl_start); 226 } 227 out2str("\n"); 228 /* Client expects a newline at end of input, doesn't expect null */ 229 rl_start[el_len++] = '\n'; 230 } 231 } 232 if (rl_cp == NULL) 233 nr = 0; 234 else { 235 nr = el_len; 236 if (nr > BUFSIZ - 8) 237 nr = BUFSIZ - 8; 238 memcpy(buf, rl_cp, nr); 239 if (nr != el_len) { 240 el_len -= nr; 241 rl_cp += nr; 242 } else { 243 rl_cp = 0; 244 if (rl_start != NULL) { 245 free(rl_start); 246 rl_start = NULL; 247 } 248 } 249 } 250 } else 251#endif 252 nr = read(parsefile->fd, buf, BUFSIZ - 8); 253 254 255 if (nr <= 0) { 256 if (nr < 0) { 257 if (errno == EINTR) 258 goto retry; 259 if (parsefile->fd == 0 && errno == EWOULDBLOCK) { 260 int flags = fcntl(0, F_GETFL, 0); 261 if (flags >= 0 && flags & O_NONBLOCK) { 262 flags &=~ O_NONBLOCK; 263 if (fcntl(0, F_SETFL, flags) >= 0) { 264 out2str("sh: turning off NDELAY mode\n"); 265 goto retry; 266 } 267 } 268 } 269 } 270 nr = -1; 271 } 272 return nr; 273} 274 275/* 276 * Refill the input buffer and return the next input character: 277 * 278 * 1) If a string was pushed back on the input, pop it; 279 * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading 280 * from a string so we can't refill the buffer, return EOF. 281 * 3) If the is more stuff in this buffer, use it else call read to fill it. 282 * 4) Process input up to the next newline, deleting nul characters. 283 */ 284 285int 286preadbuffer(void) 287{ 288 char *p, *q; 289 int more; 290 int something; 291 char savec; 292 293 if (parsefile->strpush) { 294 popstring(); 295 if (--parsenleft >= 0) 296 return (*parsenextc++); 297 } 298 if (parsenleft == EOF_NLEFT || parsefile->buf == NULL) 299 return PEOF; 300 flushout(&output); 301 flushout(&errout); 302 303again: 304 if (parselleft <= 0) { 305 if ((parselleft = preadfd()) == -1) { 306 parselleft = parsenleft = EOF_NLEFT; 307 return PEOF; 308 } 309 } 310 311 q = p = parsenextc; 312 313 /* delete nul characters */ 314 something = 0; 315 for (more = 1; more;) { 316 switch (*p) { 317 case '\0': 318 p++; /* Skip nul */ 319 goto check; 320 321 case '\t': 322 case ' ': 323 break; 324 325 case '\n': 326 parsenleft = q - parsenextc; 327 more = 0; /* Stop processing here */ 328 break; 329 330 default: 331 something = 1; 332 break; 333 } 334 335 *q++ = *p++; 336check: 337 if (--parselleft <= 0) { 338 parsenleft = q - parsenextc - 1; 339 if (parsenleft < 0) 340 goto again; 341 *q = '\0'; 342 more = 0; 343 } 344 } 345 346 savec = *q; 347 *q = '\0'; 348 349#ifdef WITH_HISTORY 350 if (parsefile->fd == 0 && hist && something) { 351 HistEvent he; 352 INTOFF; 353 history(hist, &he, whichprompt == 1? H_ENTER : H_APPEND, 354 parsenextc); 355 INTON; 356 } 357#endif 358 359 if (vflag) { 360 out2str(parsenextc); 361 flushout(out2); 362 } 363 364 *q = savec; 365 366 return *parsenextc++; 367} 368 369/* 370 * Undo the last call to pgetc. Only one character may be pushed back. 371 * PEOF may be pushed back. 372 */ 373 374void 375pungetc(void) 376{ 377 parsenleft++; 378 parsenextc--; 379} 380 381/* 382 * Push a string back onto the input at this current parsefile level. 383 * We handle aliases this way. 384 */ 385void 386pushstring(char *s, int len, void *ap) 387{ 388 struct strpush *sp; 389 390 INTOFF; 391/*dprintf("*** calling pushstring: %s, %d\n", s, len);*/ 392 if (parsefile->strpush) { 393 sp = ckmalloc(sizeof (struct strpush)); 394 sp->prev = parsefile->strpush; 395 parsefile->strpush = sp; 396 } else 397 sp = parsefile->strpush = &(parsefile->basestrpush); 398 sp->prevstring = parsenextc; 399 sp->prevnleft = parsenleft; 400 sp->prevlleft = parselleft; 401 sp->ap = (struct alias *)ap; 402 if (ap) 403 ((struct alias *)ap)->flag |= ALIASINUSE; 404 parsenextc = s; 405 parsenleft = len; 406 INTON; 407} 408 409void 410popstring(void) 411{ 412 struct strpush *sp = parsefile->strpush; 413 414 INTOFF; 415 parsenextc = sp->prevstring; 416 parsenleft = sp->prevnleft; 417 parselleft = sp->prevlleft; 418/*dprintf("*** calling popstring: restoring to '%s'\n", parsenextc);*/ 419 if (sp->ap) 420 sp->ap->flag &= ~ALIASINUSE; 421 parsefile->strpush = sp->prev; 422 if (sp != &(parsefile->basestrpush)) 423 ckfree(sp); 424 INTON; 425} 426 427/* 428 * Set the input to take input from a file. If push is set, push the 429 * old input onto the stack first. 430 */ 431 432void 433setinputfile(const char *fname, int push) 434{ 435 int fd; 436 int fd2; 437 438 INTOFF; 439 if ((fd = open(fname, O_RDONLY)) < 0) 440 error("Can't open %s", fname); 441 if (fd < 10) { 442 fd2 = copyfd(fd, 10); 443 close(fd); 444 if (fd2 < 0) 445 error("Out of file descriptors"); 446 fd = fd2; 447 } 448 setinputfd(fd, push); 449 INTON; 450} 451 452 453/* 454 * Like setinputfile, but takes an open file descriptor. Call this with 455 * interrupts off. 456 */ 457 458void 459setinputfd(int fd, int push) 460{ 461 (void) fcntl(fd, F_SETFD, FD_CLOEXEC); 462 if (push) { 463 pushfile(); 464 parsefile->buf = ckmalloc(BUFSIZ); 465 } 466 if (parsefile->fd > 0) 467 close(parsefile->fd); 468 parsefile->fd = fd; 469 if (parsefile->buf == NULL) 470 parsefile->buf = ckmalloc(BUFSIZ); 471 parselleft = parsenleft = 0; 472 plinno = 1; 473} 474 475 476/* 477 * Like setinputfile, but takes input from a string. 478 */ 479 480void 481setinputstring(char *string, int push) 482{ 483 INTOFF; 484 if (push) 485 pushfile(); 486 parsenextc = string; 487 parselleft = parsenleft = strlen(string); 488 parsefile->buf = NULL; 489 plinno = 1; 490 INTON; 491} 492 493 494 495/* 496 * To handle the "." command, a stack of input files is used. Pushfile 497 * adds a new entry to the stack and popfile restores the previous level. 498 */ 499 500STATIC void 501pushfile(void) 502{ 503 struct parsefile *pf; 504 505 parsefile->nleft = parsenleft; 506 parsefile->lleft = parselleft; 507 parsefile->nextc = parsenextc; 508 parsefile->linno = plinno; 509 pf = (struct parsefile *)ckmalloc(sizeof (struct parsefile)); 510 pf->prev = parsefile; 511 pf->fd = -1; 512 pf->strpush = NULL; 513 pf->basestrpush.prev = NULL; 514 parsefile = pf; 515} 516 517 518void 519popfile(void) 520{ 521 struct parsefile *pf = parsefile; 522 523 INTOFF; 524 if (pf->fd >= 0) 525 close(pf->fd); 526 if (pf->buf) 527 ckfree(pf->buf); 528 while (pf->strpush) 529 popstring(); 530 parsefile = pf->prev; 531 ckfree(pf); 532 parsenleft = parsefile->nleft; 533 parselleft = parsefile->lleft; 534 parsenextc = parsefile->nextc; 535 plinno = parsefile->linno; 536 INTON; 537} 538 539 540/* 541 * Return to top level. 542 */ 543 544void 545popallfiles(void) 546{ 547 while (parsefile != &basepf) 548 popfile(); 549} 550 551 552 553/* 554 * Close the file(s) that the shell is reading commands from. Called 555 * after a fork is done. 556 * 557 * Takes one arg, vfork, which tells it to not modify its global vars 558 * as it is still running in the parent. 559 * 560 * This code is (probably) unnecessary as the 'close on exec' flag is 561 * set and should be enough. In the vfork case it is definitely wrong 562 * to close the fds as another fork() may be done later to feed data 563 * from a 'here' document into a pipe and we don't want to close the 564 * pipe! 565 */ 566 567void 568closescript(int vforked) 569{ 570 if (vforked) 571 return; 572 popallfiles(); 573 if (parsefile->fd > 0) { 574 close(parsefile->fd); 575 parsefile->fd = 0; 576 } 577} 578