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36 * @(#)input.c 8.3 (Berkeley) 6/9/95
37 * $FreeBSD: src/bin/sh/input.c,v 1.35 2012/01/14 22:46:18 jilles Exp $
40 #include <stdio.h> /* defines BUFSIZ */
48 * This file implements the input routines used by the parser.
61 #include "myhistedit.h"
64 #define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */
68 struct strpush *prev; /* preceding string on stack */
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.
82 struct parsefile *prev; /* preceding file on stack */
83 int linno; /* current line */
84 int fd; /* file descriptor (or -1 if string) */
85 int nleft; /* number of chars left in this line */
86 int lleft; /* number of lines left in this buffer */
87 char *nextc; /* next char in buffer */
88 char *buf; /* input buffer */
89 struct strpush *strpush; /* for pushing strings at this level */
90 struct strpush basestrpush; /* so pushing one is fast */
94 int plinno = 1; /* input line number */
95 int parsenleft; /* copy of parsefile->nleft */
96 MKINIT int parselleft; /* copy of parsefile->lleft */
97 char *parsenextc; /* copy of parsefile->nextc */
98 MKINIT struct parsefile basepf; /* top level input file */
99 MKINIT char basebuf[BUFSIZ + 1]; /* buffer for top level input file */
100 static struct parsefile *parsefile = &basepf; /* current input file */
101 int init_editline = 0; /* editline library initialized? */
102 int whichprompt; /* 1 == PS1, 2 == PS2 */
104 EditLine *el; /* cookie for editline package */
106 static void pushfile(void);
107 static int preadfd(void);
108 static void popstring(void);
116 basepf.nextc = basepf.buf = basebuf;
121 parselleft = parsenleft = 0; /* clear input buffer */
127 * Read a line from the script.
131 pfgets(char *line, int len)
137 while (--nleft > 0) {
155 * Read a character from the script, returning PEOF on end of file.
156 * Nul characters in the input are silently discarded.
162 return pgetc_macro();
170 parsenextc = parsefile->buf;
173 if (el != NULL && gotwinch) {
180 if (parsefile->fd == 0 && el) {
181 static const char *rl_cp;
185 rl_cp = el_gets(el, &el_len);
192 memcpy(parsenextc, rl_cp, nr);
201 nr = read(parsefile->fd, parsenextc, BUFSIZ);
207 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
208 int flags = fcntl(0, F_GETFL, 0);
209 if (flags >= 0 && flags & O_NONBLOCK) {
210 flags &=~ O_NONBLOCK;
211 if (fcntl(0, F_SETFL, flags) >= 0) {
212 out2fmt_flush("sh: turning off NDELAY mode\n");
224 * Refill the input buffer and return the next input character:
226 * 1) If a string was pushed back on the input, pop it;
227 * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading
228 * from a string so we can't refill the buffer, return EOF.
229 * 3) If there is more in this buffer, use it else call read to fill it.
230 * 4) Process input up to the next newline, deleting nul characters.
241 if (parsefile->strpush) {
243 if (--parsenleft >= 0)
244 return (*parsenextc++);
246 if (parsenleft == EOF_NLEFT || parsefile->buf == NULL)
252 if (parselleft <= 0) {
253 if ((parselleft = preadfd()) == -1) {
254 parselleft = parsenleft = EOF_NLEFT;
261 /* delete nul characters */
263 for (more = 1; more;) {
274 parsenleft = q - parsenextc;
275 more = 0; /* Stop processing here */
285 if (--parselleft <= 0) {
286 parsenleft = q - parsenextc - 1;
298 if (parsefile->fd == 0 && hist && something) {
301 history(hist, &he, whichprompt == 1 ? H_ENTER : H_ADD,
314 return *parsenextc++;
318 * Returns if we are certain we are at EOF. Does not cause any more input
319 * to be read from the outside world.
327 if (parsefile->strpush)
329 if (parsenleft == EOF_NLEFT || parsefile->buf == NULL)
335 * Undo the last call to pgetc. Only one character may be pushed back.
336 * PEOF may be pushed back.
347 * Push a string back onto the input at this current parsefile level.
348 * We handle aliases this way.
351 pushstring(char *s, int len, void *ap)
356 /*out2fmt_flush("*** calling pushstring: %s, %d\n", s, len);*/
357 if (parsefile->strpush) {
358 sp = ckmalloc(sizeof (struct strpush));
359 sp->prev = parsefile->strpush;
360 parsefile->strpush = sp;
362 sp = parsefile->strpush = &(parsefile->basestrpush);
363 sp->prevstring = parsenextc;
364 sp->prevnleft = parsenleft;
365 sp->prevlleft = parselleft;
366 sp->ap = (struct alias *)ap;
368 ((struct alias *)ap)->flag |= ALIASINUSE;
377 struct strpush *sp = parsefile->strpush;
380 parsenextc = sp->prevstring;
381 parsenleft = sp->prevnleft;
382 parselleft = sp->prevlleft;
383 /*out2fmt_flush("*** calling popstring: restoring to '%s'\n", parsenextc);*/
385 sp->ap->flag &= ~ALIASINUSE;
386 parsefile->strpush = sp->prev;
387 if (sp != &(parsefile->basestrpush))
393 * Set the input to take input from a file. If push is set, push the
394 * old input onto the stack first.
398 setinputfile(const char *fname, int push)
404 if ((fd = open(fname, O_RDONLY)) < 0)
405 error("cannot open %s: %s", fname, strerror(errno));
407 fd2 = fcntl(fd, F_DUPFD, 10);
410 error("Out of file descriptors");
413 setinputfd(fd, push);
419 * Like setinputfile, but takes an open file descriptor. Call this with
424 setinputfd(int fd, int push)
426 fcntl(fd, F_SETFD, FD_CLOEXEC);
429 parsefile->buf = ckmalloc(BUFSIZ + 1);
431 if (parsefile->fd > 0)
432 close(parsefile->fd);
434 if (parsefile->buf == NULL)
435 parsefile->buf = ckmalloc(BUFSIZ + 1);
436 parselleft = parsenleft = 0;
442 * Like setinputfile, but takes input from a string.
446 setinputstring(char *string, int push)
452 parselleft = parsenleft = strlen(string);
453 parsefile->buf = NULL;
461 * To handle the "." command, a stack of input files is used. Pushfile
462 * adds a new entry to the stack and popfile restores the previous level.
468 struct parsefile *pf;
470 parsefile->nleft = parsenleft;
471 parsefile->lleft = parselleft;
472 parsefile->nextc = parsenextc;
473 parsefile->linno = plinno;
474 pf = (struct parsefile *)ckmalloc(sizeof (struct parsefile));
475 pf->prev = parsefile;
478 pf->basestrpush.prev = NULL;
486 struct parsefile *pf = parsefile;
495 parsefile = pf->prev;
497 parsenleft = parsefile->nleft;
498 parselleft = parsefile->lleft;
499 parsenextc = parsefile->nextc;
500 plinno = parsefile->linno;
506 * Return current file (to go back to it later using popfilesupto()).
517 * Pop files until the given file is on top again. Useful for regular
518 * builtins that read shell commands from files or strings.
519 * If the given file is not an active file, an error is raised.
523 popfilesupto(struct parsefile *file)
525 while (parsefile != file && parsefile != &basepf)
527 if (parsefile != file)
528 error("popfilesupto() misused");
532 * Return to top level.
538 while (parsefile != &basepf)
545 * Close the file(s) that the shell is reading commands from. Called
546 * after a fork is done.
553 if (parsefile->fd > 0) {
554 close(parsefile->fd);