Add the DragonFly cvs id and perform general cleanups on cvs/rcs/sccs ids. Most
[dragonfly.git] / bin / sh / input.c
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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.
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35 *
36 * @(#)input.c 8.3 (Berkeley) 6/9/95
37 * $FreeBSD: src/bin/sh/input.c,v 1.14.2.2 2002/08/27 01:36:28 tjr Exp $
38 * $DragonFly: src/bin/sh/input.c,v 1.2 2003/06/17 04:22:50 dillon Exp $
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39 */
40
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41#include <stdio.h> /* defines BUFSIZ */
42#include <fcntl.h>
43#include <errno.h>
44#include <unistd.h>
45#include <stdlib.h>
46#include <string.h>
47
48/*
49 * This file implements the input routines used by the parser.
50 */
51
52#include "shell.h"
53#include "redir.h"
54#include "syntax.h"
55#include "input.h"
56#include "output.h"
57#include "options.h"
58#include "memalloc.h"
59#include "error.h"
60#include "alias.h"
61#include "parser.h"
62#include "myhistedit.h"
63#include "trap.h"
64
65#define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */
66
67MKINIT
68struct strpush {
69 struct strpush *prev; /* preceding string on stack */
70 char *prevstring;
71 int prevnleft;
72 int prevlleft;
73 struct alias *ap; /* if push was associated with an alias */
74};
75
76/*
77 * The parsefile structure pointed to by the global variable parsefile
78 * contains information about the current file being read.
79 */
80
81MKINIT
82struct parsefile {
83 struct parsefile *prev; /* preceding file on stack */
84 int linno; /* current line */
85 int fd; /* file descriptor (or -1 if string) */
86 int nleft; /* number of chars left in this line */
87 int lleft; /* number of lines left in this buffer */
88 char *nextc; /* next char in buffer */
89 char *buf; /* input buffer */
90 struct strpush *strpush; /* for pushing strings at this level */
91 struct strpush basestrpush; /* so pushing one is fast */
92};
93
94
95int plinno = 1; /* input line number */
96MKINIT int parsenleft; /* copy of parsefile->nleft */
97MKINIT int parselleft; /* copy of parsefile->lleft */
98char *parsenextc; /* copy of parsefile->nextc */
99MKINIT struct parsefile basepf; /* top level input file */
100char basebuf[BUFSIZ]; /* buffer for top level input file */
101struct parsefile *parsefile = &basepf; /* current input file */
102int init_editline = 0; /* editline library initialized? */
103int whichprompt; /* 1 == PS1, 2 == PS2 */
104
105EditLine *el; /* cookie for editline package */
106
107STATIC void pushfile(void);
108static int preadfd(void);
109
110#ifdef mkinit
111INCLUDE "input.h"
112INCLUDE "error.h"
113
114INIT {
115 extern char basebuf[];
116
117 basepf.nextc = basepf.buf = basebuf;
118}
119
120RESET {
121 if (exception != EXSHELLPROC)
122 parselleft = parsenleft = 0; /* clear input buffer */
123 popallfiles();
124}
125
126SHELLPROC {
127 popallfiles();
128}
129#endif
130
131
132/*
133 * Read a line from the script.
134 */
135
136char *
137pfgets(char *line, int len)
138{
139 char *p = line;
140 int nleft = len;
141 int c;
142
143 while (--nleft > 0) {
144 c = pgetc_macro();
145 if (c == PEOF) {
146 if (p == line)
147 return NULL;
148 break;
149 }
150 *p++ = c;
151 if (c == '\n')
152 break;
153 }
154 *p = '\0';
155 return line;
156}
157
158
159
160/*
161 * Read a character from the script, returning PEOF on end of file.
162 * Nul characters in the input are silently discarded.
163 */
164
165int
166pgetc(void)
167{
168 return pgetc_macro();
169}
170
171
172static int
173preadfd(void)
174{
175 int nr;
176 parsenextc = parsefile->buf;
177
178#ifndef NO_HISTORY
179 if (el != NULL && gotwinch) {
180 gotwinch = 0;
181 el_resize(el);
182 }
183#endif
184retry:
185#ifndef NO_HISTORY
186 if (parsefile->fd == 0 && el) {
187 const char *rl_cp;
188
189 rl_cp = el_gets(el, &nr);
190 if (rl_cp == NULL)
191 nr = 0;
192 else {
193 /* XXX - BUFSIZE should redesign so not necessary */
194 (void) strcpy(parsenextc, rl_cp);
195 }
196 } else
197#endif
198 nr = read(parsefile->fd, parsenextc, BUFSIZ - 1);
199
200 if (nr <= 0) {
201 if (nr < 0) {
202 if (errno == EINTR)
203 goto retry;
204 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
205 int flags = fcntl(0, F_GETFL, 0);
206 if (flags >= 0 && flags & O_NONBLOCK) {
207 flags &=~ O_NONBLOCK;
208 if (fcntl(0, F_SETFL, flags) >= 0) {
209 out2str("sh: turning off NDELAY mode\n");
210 goto retry;
211 }
212 }
213 }
214 }
215 nr = -1;
216 }
217 return nr;
218}
219
220/*
221 * Refill the input buffer and return the next input character:
222 *
223 * 1) If a string was pushed back on the input, pop it;
224 * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading
225 * from a string so we can't refill the buffer, return EOF.
226 * 3) If there is more in this buffer, use it else call read to fill it.
227 * 4) Process input up to the next newline, deleting nul characters.
228 */
229
230int
231preadbuffer(void)
232{
233 char *p, *q;
234 int more;
235 int something;
236 char savec;
237
238 if (parsefile->strpush) {
239 popstring();
240 if (--parsenleft >= 0)
241 return (*parsenextc++);
242 }
243 if (parsenleft == EOF_NLEFT || parsefile->buf == NULL)
244 return PEOF;
245 flushout(&output);
246 flushout(&errout);
247
248again:
249 if (parselleft <= 0) {
250 if ((parselleft = preadfd()) == -1) {
251 parselleft = parsenleft = EOF_NLEFT;
252 return PEOF;
253 }
254 }
255
256 q = p = parsenextc;
257
258 /* delete nul characters */
259 something = 0;
260 for (more = 1; more;) {
261 switch (*p) {
262 case '\0':
263 p++; /* Skip nul */
264 goto check;
265
266 case '\t':
267 case ' ':
268 break;
269
270 case '\n':
271 parsenleft = q - parsenextc;
272 more = 0; /* Stop processing here */
273 break;
274
275 default:
276 something = 1;
277 break;
278 }
279
280 *q++ = *p++;
281check:
282 if (--parselleft <= 0) {
283 parsenleft = q - parsenextc - 1;
284 if (parsenleft < 0)
285 goto again;
286 *q = '\0';
287 more = 0;
288 }
289 }
290
291 savec = *q;
292 *q = '\0';
293
294#ifndef NO_HISTORY
295 if (parsefile->fd == 0 && hist && something) {
296 INTOFF;
297 history(hist, whichprompt == 1 ? H_ENTER : H_ADD, parsenextc);
298 INTON;
299 }
300#endif
301
302 if (vflag) {
303 out2str(parsenextc);
304 flushout(out2);
305 }
306
307 *q = savec;
308
309 return *parsenextc++;
310}
311
312/*
313 * Undo the last call to pgetc. Only one character may be pushed back.
314 * PEOF may be pushed back.
315 */
316
317void
318pungetc(void)
319{
320 parsenleft++;
321 parsenextc--;
322}
323
324/*
325 * Push a string back onto the input at this current parsefile level.
326 * We handle aliases this way.
327 */
328void
329pushstring(char *s, int len, void *ap)
330{
331 struct strpush *sp;
332
333 INTOFF;
334/*dprintf("*** calling pushstring: %s, %d\n", s, len);*/
335 if (parsefile->strpush) {
336 sp = ckmalloc(sizeof (struct strpush));
337 sp->prev = parsefile->strpush;
338 parsefile->strpush = sp;
339 } else
340 sp = parsefile->strpush = &(parsefile->basestrpush);
341 sp->prevstring = parsenextc;
342 sp->prevnleft = parsenleft;
343 sp->prevlleft = parselleft;
344 sp->ap = (struct alias *)ap;
345 if (ap)
346 ((struct alias *)ap)->flag |= ALIASINUSE;
347 parsenextc = s;
348 parsenleft = len;
349 INTON;
350}
351
352void
353popstring(void)
354{
355 struct strpush *sp = parsefile->strpush;
356
357 INTOFF;
358 parsenextc = sp->prevstring;
359 parsenleft = sp->prevnleft;
360 parselleft = sp->prevlleft;
361/*dprintf("*** calling popstring: restoring to '%s'\n", parsenextc);*/
362 if (sp->ap)
363 sp->ap->flag &= ~ALIASINUSE;
364 parsefile->strpush = sp->prev;
365 if (sp != &(parsefile->basestrpush))
366 ckfree(sp);
367 INTON;
368}
369
370/*
371 * Set the input to take input from a file. If push is set, push the
372 * old input onto the stack first.
373 */
374
375void
376setinputfile(char *fname, int push)
377{
378 int fd;
379 int fd2;
380
381 INTOFF;
382 if ((fd = open(fname, O_RDONLY)) < 0)
383 error("Can't open %s: %s", fname, strerror(errno));
384 if (fd < 10) {
385 fd2 = copyfd(fd, 10);
386 close(fd);
387 if (fd2 < 0)
388 error("Out of file descriptors");
389 fd = fd2;
390 }
391 setinputfd(fd, push);
392 INTON;
393}
394
395
396/*
397 * Like setinputfile, but takes an open file descriptor. Call this with
398 * interrupts off.
399 */
400
401void
402setinputfd(int fd, int push)
403{
404 (void)fcntl(fd, F_SETFD, FD_CLOEXEC);
405 if (push) {
406 pushfile();
407 parsefile->buf = ckmalloc(BUFSIZ);
408 }
409 if (parsefile->fd > 0)
410 close(parsefile->fd);
411 parsefile->fd = fd;
412 if (parsefile->buf == NULL)
413 parsefile->buf = ckmalloc(BUFSIZ);
414 parselleft = parsenleft = 0;
415 plinno = 1;
416}
417
418
419/*
420 * Like setinputfile, but takes input from a string.
421 */
422
423void
424setinputstring(char *string, int push)
425{
426 INTOFF;
427 if (push)
428 pushfile();
429 parsenextc = string;
430 parselleft = parsenleft = strlen(string);
431 parsefile->buf = NULL;
432 plinno = 1;
433 INTON;
434}
435
436
437
438/*
439 * To handle the "." command, a stack of input files is used. Pushfile
440 * adds a new entry to the stack and popfile restores the previous level.
441 */
442
443STATIC void
444pushfile(void)
445{
446 struct parsefile *pf;
447
448 parsefile->nleft = parsenleft;
449 parsefile->lleft = parselleft;
450 parsefile->nextc = parsenextc;
451 parsefile->linno = plinno;
452 pf = (struct parsefile *)ckmalloc(sizeof (struct parsefile));
453 pf->prev = parsefile;
454 pf->fd = -1;
455 pf->strpush = NULL;
456 pf->basestrpush.prev = NULL;
457 parsefile = pf;
458}
459
460
461void
462popfile(void)
463{
464 struct parsefile *pf = parsefile;
465
466 INTOFF;
467 if (pf->fd >= 0)
468 close(pf->fd);
469 if (pf->buf)
470 ckfree(pf->buf);
471 while (pf->strpush)
472 popstring();
473 parsefile = pf->prev;
474 ckfree(pf);
475 parsenleft = parsefile->nleft;
476 parselleft = parsefile->lleft;
477 parsenextc = parsefile->nextc;
478 plinno = parsefile->linno;
479 INTON;
480}
481
482
483/*
484 * Return to top level.
485 */
486
487void
488popallfiles(void)
489{
490 while (parsefile != &basepf)
491 popfile();
492}
493
494
495
496/*
497 * Close the file(s) that the shell is reading commands from. Called
498 * after a fork is done.
499 */
500
501void
502closescript(void)
503{
504 popallfiles();
505 if (parsefile->fd > 0) {
506 close(parsefile->fd);
507 parsefile->fd = 0;
508 }
509}