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[dragonfly.git] / bin / sh / input.c
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MD
1/*-
2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Kenneth Almquist.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#ifndef lint
38#if 0
39static char sccsid[] = "@(#)input.c 8.3 (Berkeley) 6/9/95";
40#endif
41#endif /* not lint */
42#include <sys/cdefs.h>
43__FBSDID("$FreeBSD: src/bin/sh/input.c,v 1.14.2.2 2002/08/27 01:36:28 tjr Exp $");
44
45#include <stdio.h> /* defines BUFSIZ */
46#include <fcntl.h>
47#include <errno.h>
48#include <unistd.h>
49#include <stdlib.h>
50#include <string.h>
51
52/*
53 * This file implements the input routines used by the parser.
54 */
55
56#include "shell.h"
57#include "redir.h"
58#include "syntax.h"
59#include "input.h"
60#include "output.h"
61#include "options.h"
62#include "memalloc.h"
63#include "error.h"
64#include "alias.h"
65#include "parser.h"
66#include "myhistedit.h"
67#include "trap.h"
68
69#define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */
70
71MKINIT
72struct strpush {
73 struct strpush *prev; /* preceding string on stack */
74 char *prevstring;
75 int prevnleft;
76 int prevlleft;
77 struct alias *ap; /* if push was associated with an alias */
78};
79
80/*
81 * The parsefile structure pointed to by the global variable parsefile
82 * contains information about the current file being read.
83 */
84
85MKINIT
86struct parsefile {
87 struct parsefile *prev; /* preceding file on stack */
88 int linno; /* current line */
89 int fd; /* file descriptor (or -1 if string) */
90 int nleft; /* number of chars left in this line */
91 int lleft; /* number of lines left in this buffer */
92 char *nextc; /* next char in buffer */
93 char *buf; /* input buffer */
94 struct strpush *strpush; /* for pushing strings at this level */
95 struct strpush basestrpush; /* so pushing one is fast */
96};
97
98
99int plinno = 1; /* input line number */
100MKINIT int parsenleft; /* copy of parsefile->nleft */
101MKINIT int parselleft; /* copy of parsefile->lleft */
102char *parsenextc; /* copy of parsefile->nextc */
103MKINIT struct parsefile basepf; /* top level input file */
104char basebuf[BUFSIZ]; /* buffer for top level input file */
105struct parsefile *parsefile = &basepf; /* current input file */
106int init_editline = 0; /* editline library initialized? */
107int whichprompt; /* 1 == PS1, 2 == PS2 */
108
109EditLine *el; /* cookie for editline package */
110
111STATIC void pushfile(void);
112static int preadfd(void);
113
114#ifdef mkinit
115INCLUDE "input.h"
116INCLUDE "error.h"
117
118INIT {
119 extern char basebuf[];
120
121 basepf.nextc = basepf.buf = basebuf;
122}
123
124RESET {
125 if (exception != EXSHELLPROC)
126 parselleft = parsenleft = 0; /* clear input buffer */
127 popallfiles();
128}
129
130SHELLPROC {
131 popallfiles();
132}
133#endif
134
135
136/*
137 * Read a line from the script.
138 */
139
140char *
141pfgets(char *line, int len)
142{
143 char *p = line;
144 int nleft = len;
145 int c;
146
147 while (--nleft > 0) {
148 c = pgetc_macro();
149 if (c == PEOF) {
150 if (p == line)
151 return NULL;
152 break;
153 }
154 *p++ = c;
155 if (c == '\n')
156 break;
157 }
158 *p = '\0';
159 return line;
160}
161
162
163
164/*
165 * Read a character from the script, returning PEOF on end of file.
166 * Nul characters in the input are silently discarded.
167 */
168
169int
170pgetc(void)
171{
172 return pgetc_macro();
173}
174
175
176static int
177preadfd(void)
178{
179 int nr;
180 parsenextc = parsefile->buf;
181
182#ifndef NO_HISTORY
183 if (el != NULL && gotwinch) {
184 gotwinch = 0;
185 el_resize(el);
186 }
187#endif
188retry:
189#ifndef NO_HISTORY
190 if (parsefile->fd == 0 && el) {
191 const char *rl_cp;
192
193 rl_cp = el_gets(el, &nr);
194 if (rl_cp == NULL)
195 nr = 0;
196 else {
197 /* XXX - BUFSIZE should redesign so not necessary */
198 (void) strcpy(parsenextc, rl_cp);
199 }
200 } else
201#endif
202 nr = read(parsefile->fd, parsenextc, BUFSIZ - 1);
203
204 if (nr <= 0) {
205 if (nr < 0) {
206 if (errno == EINTR)
207 goto retry;
208 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
209 int flags = fcntl(0, F_GETFL, 0);
210 if (flags >= 0 && flags & O_NONBLOCK) {
211 flags &=~ O_NONBLOCK;
212 if (fcntl(0, F_SETFL, flags) >= 0) {
213 out2str("sh: turning off NDELAY mode\n");
214 goto retry;
215 }
216 }
217 }
218 }
219 nr = -1;
220 }
221 return nr;
222}
223
224/*
225 * Refill the input buffer and return the next input character:
226 *
227 * 1) If a string was pushed back on the input, pop it;
228 * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading
229 * from a string so we can't refill the buffer, return EOF.
230 * 3) If there is more in this buffer, use it else call read to fill it.
231 * 4) Process input up to the next newline, deleting nul characters.
232 */
233
234int
235preadbuffer(void)
236{
237 char *p, *q;
238 int more;
239 int something;
240 char savec;
241
242 if (parsefile->strpush) {
243 popstring();
244 if (--parsenleft >= 0)
245 return (*parsenextc++);
246 }
247 if (parsenleft == EOF_NLEFT || parsefile->buf == NULL)
248 return PEOF;
249 flushout(&output);
250 flushout(&errout);
251
252again:
253 if (parselleft <= 0) {
254 if ((parselleft = preadfd()) == -1) {
255 parselleft = parsenleft = EOF_NLEFT;
256 return PEOF;
257 }
258 }
259
260 q = p = parsenextc;
261
262 /* delete nul characters */
263 something = 0;
264 for (more = 1; more;) {
265 switch (*p) {
266 case '\0':
267 p++; /* Skip nul */
268 goto check;
269
270 case '\t':
271 case ' ':
272 break;
273
274 case '\n':
275 parsenleft = q - parsenextc;
276 more = 0; /* Stop processing here */
277 break;
278
279 default:
280 something = 1;
281 break;
282 }
283
284 *q++ = *p++;
285check:
286 if (--parselleft <= 0) {
287 parsenleft = q - parsenextc - 1;
288 if (parsenleft < 0)
289 goto again;
290 *q = '\0';
291 more = 0;
292 }
293 }
294
295 savec = *q;
296 *q = '\0';
297
298#ifndef NO_HISTORY
299 if (parsefile->fd == 0 && hist && something) {
300 INTOFF;
301 history(hist, whichprompt == 1 ? H_ENTER : H_ADD, parsenextc);
302 INTON;
303 }
304#endif
305
306 if (vflag) {
307 out2str(parsenextc);
308 flushout(out2);
309 }
310
311 *q = savec;
312
313 return *parsenextc++;
314}
315
316/*
317 * Undo the last call to pgetc. Only one character may be pushed back.
318 * PEOF may be pushed back.
319 */
320
321void
322pungetc(void)
323{
324 parsenleft++;
325 parsenextc--;
326}
327
328/*
329 * Push a string back onto the input at this current parsefile level.
330 * We handle aliases this way.
331 */
332void
333pushstring(char *s, int len, void *ap)
334{
335 struct strpush *sp;
336
337 INTOFF;
338/*dprintf("*** calling pushstring: %s, %d\n", s, len);*/
339 if (parsefile->strpush) {
340 sp = ckmalloc(sizeof (struct strpush));
341 sp->prev = parsefile->strpush;
342 parsefile->strpush = sp;
343 } else
344 sp = parsefile->strpush = &(parsefile->basestrpush);
345 sp->prevstring = parsenextc;
346 sp->prevnleft = parsenleft;
347 sp->prevlleft = parselleft;
348 sp->ap = (struct alias *)ap;
349 if (ap)
350 ((struct alias *)ap)->flag |= ALIASINUSE;
351 parsenextc = s;
352 parsenleft = len;
353 INTON;
354}
355
356void
357popstring(void)
358{
359 struct strpush *sp = parsefile->strpush;
360
361 INTOFF;
362 parsenextc = sp->prevstring;
363 parsenleft = sp->prevnleft;
364 parselleft = sp->prevlleft;
365/*dprintf("*** calling popstring: restoring to '%s'\n", parsenextc);*/
366 if (sp->ap)
367 sp->ap->flag &= ~ALIASINUSE;
368 parsefile->strpush = sp->prev;
369 if (sp != &(parsefile->basestrpush))
370 ckfree(sp);
371 INTON;
372}
373
374/*
375 * Set the input to take input from a file. If push is set, push the
376 * old input onto the stack first.
377 */
378
379void
380setinputfile(char *fname, int push)
381{
382 int fd;
383 int fd2;
384
385 INTOFF;
386 if ((fd = open(fname, O_RDONLY)) < 0)
387 error("Can't open %s: %s", fname, strerror(errno));
388 if (fd < 10) {
389 fd2 = copyfd(fd, 10);
390 close(fd);
391 if (fd2 < 0)
392 error("Out of file descriptors");
393 fd = fd2;
394 }
395 setinputfd(fd, push);
396 INTON;
397}
398
399
400/*
401 * Like setinputfile, but takes an open file descriptor. Call this with
402 * interrupts off.
403 */
404
405void
406setinputfd(int fd, int push)
407{
408 (void)fcntl(fd, F_SETFD, FD_CLOEXEC);
409 if (push) {
410 pushfile();
411 parsefile->buf = ckmalloc(BUFSIZ);
412 }
413 if (parsefile->fd > 0)
414 close(parsefile->fd);
415 parsefile->fd = fd;
416 if (parsefile->buf == NULL)
417 parsefile->buf = ckmalloc(BUFSIZ);
418 parselleft = parsenleft = 0;
419 plinno = 1;
420}
421
422
423/*
424 * Like setinputfile, but takes input from a string.
425 */
426
427void
428setinputstring(char *string, int push)
429{
430 INTOFF;
431 if (push)
432 pushfile();
433 parsenextc = string;
434 parselleft = parsenleft = strlen(string);
435 parsefile->buf = NULL;
436 plinno = 1;
437 INTON;
438}
439
440
441
442/*
443 * To handle the "." command, a stack of input files is used. Pushfile
444 * adds a new entry to the stack and popfile restores the previous level.
445 */
446
447STATIC void
448pushfile(void)
449{
450 struct parsefile *pf;
451
452 parsefile->nleft = parsenleft;
453 parsefile->lleft = parselleft;
454 parsefile->nextc = parsenextc;
455 parsefile->linno = plinno;
456 pf = (struct parsefile *)ckmalloc(sizeof (struct parsefile));
457 pf->prev = parsefile;
458 pf->fd = -1;
459 pf->strpush = NULL;
460 pf->basestrpush.prev = NULL;
461 parsefile = pf;
462}
463
464
465void
466popfile(void)
467{
468 struct parsefile *pf = parsefile;
469
470 INTOFF;
471 if (pf->fd >= 0)
472 close(pf->fd);
473 if (pf->buf)
474 ckfree(pf->buf);
475 while (pf->strpush)
476 popstring();
477 parsefile = pf->prev;
478 ckfree(pf);
479 parsenleft = parsefile->nleft;
480 parselleft = parsefile->lleft;
481 parsenextc = parsefile->nextc;
482 plinno = parsefile->linno;
483 INTON;
484}
485
486
487/*
488 * Return to top level.
489 */
490
491void
492popallfiles(void)
493{
494 while (parsefile != &basepf)
495 popfile();
496}
497
498
499
500/*
501 * Close the file(s) that the shell is reading commands from. Called
502 * after a fork is done.
503 */
504
505void
506closescript(void)
507{
508 popallfiles();
509 if (parsefile->fd > 0) {
510 close(parsefile->fd);
511 parsefile->fd = 0;
512 }
513}