2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 static char sccsid
[] = "@(#)input.c 8.3 (Berkeley) 6/9/95";
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
41 #include <stdio.h> /* defines BUFSIZ */
49 * This file implements the input routines used by the parser.
63 #include "myhistedit.h"
67 #define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */
70 struct strpush
*prev
; /* preceding string on stack */
71 const char *prevstring
;
74 struct alias
*ap
; /* if push was associated with an alias */
78 * The parsefile structure pointed to by the global variable parsefile
79 * contains information about the current file being read.
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 const 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 */
95 int plinno
= 1; /* input line number */
96 int parsenleft
; /* copy of parsefile->nleft */
97 static int parselleft
; /* copy of parsefile->lleft */
98 const char *parsenextc
; /* copy of parsefile->nextc */
99 static char basebuf
[BUFSIZ
+ 1];/* buffer for top level input file */
100 static struct parsefile basepf
= { /* top level input file */
104 static struct parsefile
*parsefile
= &basepf
; /* current input file */
105 int whichprompt
; /* 1 == PS1, 2 == PS2 */
108 EditLine
*el
; /* cookie for editline package */
111 static void pushfile(void);
112 static int preadfd(void);
113 static void popstring(void);
119 parselleft
= parsenleft
= 0; /* clear input buffer */
125 * Read a character from the script, returning PEOF on end of file.
126 * Nul characters in the input are silently discarded.
132 return pgetc_macro();
140 parsenextc
= parsefile
->buf
;
144 if (parsefile
->fd
== 0 && el
) {
145 static const char *rl_cp
;
150 rl_cp
= el_gets(el
, &el_len
);
153 nr
= el_len
== 0 ? 0 : -1;
158 memcpy(parsefile
->buf
, rl_cp
, nr
);
167 nr
= read(parsefile
->fd
, parsefile
->buf
, BUFSIZ
);
173 if (parsefile
->fd
== 0 && errno
== EWOULDBLOCK
) {
174 int flags
= fcntl(0, F_GETFL
, 0);
175 if (flags
>= 0 && flags
& O_NONBLOCK
) {
176 flags
&=~ O_NONBLOCK
;
177 if (fcntl(0, F_SETFL
, flags
) >= 0) {
178 out2fmt_flush("sh: turning off NDELAY mode\n");
190 * Refill the input buffer and return the next input character:
192 * 1) If a string was pushed back on the input, pop it;
193 * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading
194 * from a string so we can't refill the buffer, return EOF.
195 * 3) If there is more in this buffer, use it else call read to fill it.
196 * 4) Process input up to the next newline, deleting nul characters.
206 while (parsefile
->strpush
) {
208 * Add a space to the end of an alias to ensure that the
209 * alias remains in use while parsing its last word.
210 * This avoids alias recursions.
212 if (parsenleft
== -1 && parsefile
->strpush
->ap
!= NULL
)
215 if (--parsenleft
>= 0)
216 return (*parsenextc
++);
218 if (parsenleft
== EOF_NLEFT
|| parsefile
->buf
== NULL
)
224 if (parselleft
<= 0) {
225 if ((parselleft
= preadfd()) == -1) {
226 parselleft
= parsenleft
= EOF_NLEFT
;
231 q
= p
= parsefile
->buf
+ (parsenextc
- parsefile
->buf
);
233 /* delete nul characters */
234 for (more
= 1; more
;) {
241 parsenleft
= q
- parsenextc
;
242 more
= 0; /* Stop processing here */
251 if (--parselleft
<= 0) {
252 parsenleft
= q
- parsenextc
- 1;
264 if (parsefile
->fd
== 0 && hist
&&
265 parsenextc
[strspn(parsenextc
, " \t\n")] != '\0') {
268 history(hist
, &he
, whichprompt
== 1 ? H_ENTER
: H_ADD
,
281 return *parsenextc
++;
285 * Returns if we are certain we are at EOF. Does not cause any more input
286 * to be read from the outside world.
294 if (parsefile
->strpush
)
296 if (parsenleft
== EOF_NLEFT
|| parsefile
->buf
== NULL
)
302 * Undo the last call to pgetc. Only one character may be pushed back.
303 * PEOF may be pushed back.
314 * Push a string back onto the input at this current parsefile level.
315 * We handle aliases this way.
318 pushstring(const char *s
, int len
, struct alias
*ap
)
323 /*out2fmt_flush("*** calling pushstring: %s, %d\n", s, len);*/
324 if (parsefile
->strpush
) {
325 sp
= ckmalloc(sizeof (struct strpush
));
326 sp
->prev
= parsefile
->strpush
;
327 parsefile
->strpush
= sp
;
329 sp
= parsefile
->strpush
= &(parsefile
->basestrpush
);
330 sp
->prevstring
= parsenextc
;
331 sp
->prevnleft
= parsenleft
;
332 sp
->prevlleft
= parselleft
;
335 ap
->flag
|= ALIASINUSE
;
344 struct strpush
*sp
= parsefile
->strpush
;
348 if (parsenextc
!= sp
->ap
->val
&&
349 (parsenextc
[-1] == ' ' || parsenextc
[-1] == '\t'))
351 sp
->ap
->flag
&= ~ALIASINUSE
;
353 parsenextc
= sp
->prevstring
;
354 parsenleft
= sp
->prevnleft
;
355 parselleft
= sp
->prevlleft
;
356 /*out2fmt_flush("*** calling popstring: restoring to '%s'\n", parsenextc);*/
357 parsefile
->strpush
= sp
->prev
;
358 if (sp
!= &(parsefile
->basestrpush
))
364 * Set the input to take input from a file. If push is set, push the
365 * old input onto the stack first.
369 setinputfile(const char *fname
, int push
)
375 if ((fd
= open(fname
, O_RDONLY
| O_CLOEXEC_MAYBE
)) < 0)
376 error("cannot open %s: %s", fname
, strerror(errno
));
378 fd2
= fcntl(fd
, F_DUPFD_CLOEXEC_MAYBE
, 10);
381 error("Out of file descriptors");
384 setinputfd(fd
, push
);
390 * Like setinputfile, but takes an open file descriptor (which should have
391 * its FD_CLOEXEC flag already set). Call this with interrupts off.
395 setinputfd(int fd
, int push
)
397 #if !defined(O_CLOEXEC) || !defined(F_DUPFD_CLOEXEC)
398 fcntl(fd
, F_SETFD
, FD_CLOEXEC
);
402 parsefile
->buf
= ckmalloc(BUFSIZ
+ 1);
404 if (parsefile
->fd
> 0)
405 close(parsefile
->fd
);
407 if (parsefile
->buf
== NULL
)
408 parsefile
->buf
= ckmalloc(BUFSIZ
+ 1);
409 parselleft
= parsenleft
= 0;
415 * Like setinputfile, but takes input from a string.
419 setinputstring(const char *string
, int push
)
425 parselleft
= parsenleft
= strlen(string
);
426 parsefile
->buf
= NULL
;
434 * To handle the "." command, a stack of input files is used. Pushfile
435 * adds a new entry to the stack and popfile restores the previous level.
441 struct parsefile
*pf
;
443 parsefile
->nleft
= parsenleft
;
444 parsefile
->lleft
= parselleft
;
445 parsefile
->nextc
= parsenextc
;
446 parsefile
->linno
= plinno
;
447 pf
= (struct parsefile
*)ckmalloc(sizeof (struct parsefile
));
448 pf
->prev
= parsefile
;
451 pf
->basestrpush
.prev
= NULL
;
459 struct parsefile
*pf
= parsefile
;
468 parsefile
= pf
->prev
;
470 parsenleft
= parsefile
->nleft
;
471 parselleft
= parsefile
->lleft
;
472 parsenextc
= parsefile
->nextc
;
473 plinno
= parsefile
->linno
;
479 * Return current file (to go back to it later using popfilesupto()).
490 * Pop files until the given file is on top again. Useful for regular
491 * builtins that read shell commands from files or strings.
492 * If the given file is not an active file, an error is raised.
496 popfilesupto(struct parsefile
*file
)
498 while (parsefile
!= file
&& parsefile
!= &basepf
)
500 if (parsefile
!= file
)
501 error("popfilesupto() misused");
505 * Return to top level.
511 while (parsefile
!= &basepf
)
518 * Close the file(s) that the shell is reading commands from. Called
519 * after a fork is done.
526 if (parsefile
->fd
> 0) {
527 close(parsefile
->fd
);