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 */
68 struct strpush *prev; /* preceding string on stack */
69 const char *prevstring;
72 struct alias *ap; /* if push was associated with an alias */
76 * The parsefile structure pointed to by the global variable parsefile
77 * contains information about the current file being read.
81 struct parsefile *prev; /* preceding file on stack */
82 int linno; /* current line */
83 int fd; /* file descriptor (or -1 if string) */
84 int nleft; /* number of chars left in this line */
85 int lleft; /* number of lines left in this buffer */
86 const char *nextc; /* next char in buffer */
87 char *buf; /* input buffer */
88 struct strpush *strpush; /* for pushing strings at this level */
89 struct strpush basestrpush; /* so pushing one is fast */
93 int plinno = 1; /* input line number */
94 int parsenleft; /* copy of parsefile->nleft */
95 static int parselleft; /* copy of parsefile->lleft */
96 const char *parsenextc; /* copy of parsefile->nextc */
97 static char basebuf[BUFSIZ + 1];/* buffer for top level input file */
98 static struct parsefile basepf = { /* top level input file */
102 static struct parsefile *parsefile = &basepf; /* current input file */
103 int whichprompt; /* 1 == PS1, 2 == PS2 */
105 EditLine *el; /* cookie for editline package */
107 static void pushfile(void);
108 static int preadfd(void);
109 static void popstring(void);
115 parselleft = parsenleft = 0; /* clear input buffer */
120 * Read a line from the script.
124 pfgets(char *line, int len)
130 while (--nleft > 0) {
148 * Read a character from the script, returning PEOF on end of file.
149 * Nul characters in the input are silently discarded.
155 return pgetc_macro();
163 parsenextc = parsefile->buf;
166 if (el != NULL && gotwinch) {
173 if (parsefile->fd == 0 && el) {
174 static const char *rl_cp;
178 rl_cp = el_gets(el, &el_len);
180 nr = el_len == 0 ? 0 : -1;
185 memcpy(parsefile->buf, rl_cp, nr);
194 nr = read(parsefile->fd, parsefile->buf, BUFSIZ);
200 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
201 int flags = fcntl(0, F_GETFL, 0);
202 if (flags >= 0 && flags & O_NONBLOCK) {
203 flags &=~ O_NONBLOCK;
204 if (fcntl(0, F_SETFL, flags) >= 0) {
205 out2fmt_flush("sh: turning off NDELAY mode\n");
217 * Refill the input buffer and return the next input character:
219 * 1) If a string was pushed back on the input, pop it;
220 * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading
221 * from a string so we can't refill the buffer, return EOF.
222 * 3) If there is more in this buffer, use it else call read to fill it.
223 * 4) Process input up to the next newline, deleting nul characters.
233 if (parsefile->strpush) {
235 if (--parsenleft >= 0)
236 return (*parsenextc++);
238 if (parsenleft == EOF_NLEFT || parsefile->buf == NULL)
244 if (parselleft <= 0) {
245 if ((parselleft = preadfd()) == -1) {
246 parselleft = parsenleft = EOF_NLEFT;
251 q = p = parsefile->buf + (parsenextc - parsefile->buf);
253 /* delete nul characters */
254 for (more = 1; more;) {
261 parsenleft = q - parsenextc;
262 more = 0; /* Stop processing here */
271 if (--parselleft <= 0) {
272 parsenleft = q - parsenextc - 1;
284 if (parsefile->fd == 0 && hist &&
285 parsenextc[strspn(parsenextc, " \t\n")] != '\0') {
288 history(hist, &he, whichprompt == 1 ? H_ENTER : H_ADD,
301 return *parsenextc++;
305 * Returns if we are certain we are at EOF. Does not cause any more input
306 * to be read from the outside world.
314 if (parsefile->strpush)
316 if (parsenleft == EOF_NLEFT || parsefile->buf == NULL)
322 * Undo the last call to pgetc. Only one character may be pushed back.
323 * PEOF may be pushed back.
334 * Push a string back onto the input at this current parsefile level.
335 * We handle aliases this way.
338 pushstring(char *s, int len, struct alias *ap)
343 /*out2fmt_flush("*** calling pushstring: %s, %d\n", s, len);*/
344 if (parsefile->strpush) {
345 sp = ckmalloc(sizeof (struct strpush));
346 sp->prev = parsefile->strpush;
347 parsefile->strpush = sp;
349 sp = parsefile->strpush = &(parsefile->basestrpush);
350 sp->prevstring = parsenextc;
351 sp->prevnleft = parsenleft;
352 sp->prevlleft = parselleft;
355 ap->flag |= ALIASINUSE;
364 struct strpush *sp = parsefile->strpush;
367 parsenextc = sp->prevstring;
368 parsenleft = sp->prevnleft;
369 parselleft = sp->prevlleft;
370 /*out2fmt_flush("*** calling popstring: restoring to '%s'\n", parsenextc);*/
372 sp->ap->flag &= ~ALIASINUSE;
373 parsefile->strpush = sp->prev;
374 if (sp != &(parsefile->basestrpush))
380 * Set the input to take input from a file. If push is set, push the
381 * old input onto the stack first.
385 setinputfile(const char *fname, int push)
391 if ((fd = open(fname, O_RDONLY | O_CLOEXEC)) < 0)
392 error("cannot open %s: %s", fname, strerror(errno));
394 fd2 = fcntl(fd, F_DUPFD_CLOEXEC, 10);
397 error("Out of file descriptors");
400 setinputfd(fd, push);
406 * Like setinputfile, but takes an open file descriptor (which should have
407 * its FD_CLOEXEC flag already set). Call this with interrupts off.
411 setinputfd(int fd, int push)
415 parsefile->buf = ckmalloc(BUFSIZ + 1);
417 if (parsefile->fd > 0)
418 close(parsefile->fd);
420 if (parsefile->buf == NULL)
421 parsefile->buf = ckmalloc(BUFSIZ + 1);
422 parselleft = parsenleft = 0;
428 * Like setinputfile, but takes input from a string.
432 setinputstring(const char *string, int push)
438 parselleft = parsenleft = strlen(string);
439 parsefile->buf = NULL;
447 * To handle the "." command, a stack of input files is used. Pushfile
448 * adds a new entry to the stack and popfile restores the previous level.
454 struct parsefile *pf;
456 parsefile->nleft = parsenleft;
457 parsefile->lleft = parselleft;
458 parsefile->nextc = parsenextc;
459 parsefile->linno = plinno;
460 pf = (struct parsefile *)ckmalloc(sizeof (struct parsefile));
461 pf->prev = parsefile;
464 pf->basestrpush.prev = NULL;
472 struct parsefile *pf = parsefile;
481 parsefile = pf->prev;
483 parsenleft = parsefile->nleft;
484 parselleft = parsefile->lleft;
485 parsenextc = parsefile->nextc;
486 plinno = parsefile->linno;
492 * Return current file (to go back to it later using popfilesupto()).
503 * Pop files until the given file is on top again. Useful for regular
504 * builtins that read shell commands from files or strings.
505 * If the given file is not an active file, an error is raised.
509 popfilesupto(struct parsefile *file)
511 while (parsefile != file && parsefile != &basepf)
513 if (parsefile != file)
514 error("popfilesupto() misused");
518 * Return to top level.
524 while (parsefile != &basepf)
531 * Close the file(s) that the shell is reading commands from. Called
532 * after a fork is done.
539 if (parsefile->fd > 0) {
540 close(parsefile->fd);