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
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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
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15 * documentation and/or other materials provided with the distribution.
16 * 4. 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
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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.
62 #include "myhistedit.h"
65 #define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */
69 struct strpush *prev; /* preceding string on stack */
73 struct alias *ap; /* if push was associated with an alias */
77 * The parsefile structure pointed to by the global variable parsefile
78 * 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 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 MKINIT int parsenleft; /* copy of parsefile->nleft */
97 MKINIT int parselleft; /* copy of parsefile->lleft */
98 char *parsenextc; /* copy of parsefile->nextc */
99 MKINIT struct parsefile basepf; /* top level input file */
100 char basebuf[BUFSIZ]; /* buffer for top level input file */
101 STATIC struct parsefile *parsefile = &basepf; /* current input file */
102 int init_editline = 0; /* editline library initialized? */
103 int whichprompt; /* 1 == PS1, 2 == PS2 */
105 EditLine *el; /* cookie for editline package */
107 STATIC void pushfile(void);
108 static int preadfd(void);
115 extern char basebuf[];
117 basepf.nextc = basepf.buf = basebuf;
122 if (exception != EXSHELLPROC)
123 parselleft = parsenleft = 0; /* clear input buffer */
133 * Read a line from the script.
137 pfgets(char *line, int len)
143 while (--nleft > 0) {
161 * Read a character from the script, returning PEOF on end of file.
162 * Nul characters in the input are silently discarded.
168 return pgetc_macro();
176 parsenextc = parsefile->buf;
179 if (el != NULL && gotwinch) {
186 if (parsefile->fd == 0 && el) {
187 static const char *rl_cp;
191 rl_cp = el_gets(el, &el_len);
198 memcpy(parsenextc, rl_cp, nr);
207 nr = read(parsefile->fd, parsenextc, BUFSIZ - 1);
213 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
214 int flags = fcntl(0, F_GETFL, 0);
215 if (flags >= 0 && flags & O_NONBLOCK) {
216 flags &=~ O_NONBLOCK;
217 if (fcntl(0, F_SETFL, flags) >= 0) {
218 out2str("sh: turning off NDELAY mode\n");
230 * Refill the input buffer and return the next input character:
232 * 1) If a string was pushed back on the input, pop it;
233 * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading
234 * from a string so we can't refill the buffer, return EOF.
235 * 3) If there is more in this buffer, use it else call read to fill it.
236 * 4) Process input up to the next newline, deleting nul characters.
247 if (parsefile->strpush) {
249 if (--parsenleft >= 0)
250 return (*parsenextc++);
252 if (parsenleft == EOF_NLEFT || parsefile->buf == NULL)
258 if (parselleft <= 0) {
259 if ((parselleft = preadfd()) == -1) {
260 parselleft = parsenleft = EOF_NLEFT;
267 /* delete nul characters */
269 for (more = 1; more;) {
280 parsenleft = q - parsenextc;
281 more = 0; /* Stop processing here */
291 if (--parselleft <= 0) {
292 parsenleft = q - parsenextc - 1;
304 if (parsefile->fd == 0 && hist && something) {
307 history(hist, &he, whichprompt == 1 ? H_ENTER : H_ADD,
320 return *parsenextc++;
324 * Returns if we are certain we are at EOF. Does not cause any more input
325 * to be read from the outside world.
333 if (parsefile->strpush)
335 if (parsenleft == EOF_NLEFT || parsefile->buf == NULL)
341 * Undo the last call to pgetc. Only one character may be pushed back.
342 * PEOF may be pushed back.
353 * Push a string back onto the input at this current parsefile level.
354 * We handle aliases this way.
357 pushstring(char *s, int len, void *ap)
362 /*dprintf("*** calling pushstring: %s, %d\n", s, len);*/
363 if (parsefile->strpush) {
364 sp = ckmalloc(sizeof (struct strpush));
365 sp->prev = parsefile->strpush;
366 parsefile->strpush = sp;
368 sp = parsefile->strpush = &(parsefile->basestrpush);
369 sp->prevstring = parsenextc;
370 sp->prevnleft = parsenleft;
371 sp->prevlleft = parselleft;
372 sp->ap = (struct alias *)ap;
374 ((struct alias *)ap)->flag |= ALIASINUSE;
383 struct strpush *sp = parsefile->strpush;
386 parsenextc = sp->prevstring;
387 parsenleft = sp->prevnleft;
388 parselleft = sp->prevlleft;
389 /*dprintf("*** calling popstring: restoring to '%s'\n", parsenextc);*/
391 sp->ap->flag &= ~ALIASINUSE;
392 parsefile->strpush = sp->prev;
393 if (sp != &(parsefile->basestrpush))
399 * Set the input to take input from a file. If push is set, push the
400 * old input onto the stack first.
404 setinputfile(char *fname, int push)
410 if ((fd = open(fname, O_RDONLY)) < 0)
411 error("Can't open %s: %s", fname, strerror(errno));
413 fd2 = fcntl(fd, F_DUPFD, 10);
416 error("Out of file descriptors");
419 setinputfd(fd, push);
425 * Like setinputfile, but takes an open file descriptor. Call this with
430 setinputfd(int fd, int push)
432 (void)fcntl(fd, F_SETFD, FD_CLOEXEC);
435 parsefile->buf = ckmalloc(BUFSIZ);
437 if (parsefile->fd > 0)
438 close(parsefile->fd);
440 if (parsefile->buf == NULL)
441 parsefile->buf = ckmalloc(BUFSIZ);
442 parselleft = parsenleft = 0;
448 * Like setinputfile, but takes input from a string.
452 setinputstring(char *string, int push)
458 parselleft = parsenleft = strlen(string);
459 parsefile->buf = NULL;
467 * To handle the "." command, a stack of input files is used. Pushfile
468 * adds a new entry to the stack and popfile restores the previous level.
474 struct parsefile *pf;
476 parsefile->nleft = parsenleft;
477 parsefile->lleft = parselleft;
478 parsefile->nextc = parsenextc;
479 parsefile->linno = plinno;
480 pf = (struct parsefile *)ckmalloc(sizeof (struct parsefile));
481 pf->prev = parsefile;
484 pf->basestrpush.prev = NULL;
492 struct parsefile *pf = parsefile;
501 parsefile = pf->prev;
503 parsenleft = parsefile->nleft;
504 parselleft = parsefile->lleft;
505 parsenextc = parsefile->nextc;
506 plinno = parsefile->linno;
512 * Return to top level.
518 while (parsefile != &basepf)
525 * Close the file(s) that the shell is reading commands from. Called
526 * after a fork is done.
533 if (parsefile->fd > 0) {
534 close(parsefile->fd);