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36 * @(#)input.c 8.3 (Berkeley) 6/9/95
37 * $FreeBSD: src/bin/sh/input.c,v 1.33 2011/06/04 15:05:52 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]; /* 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);
115 basepf.nextc = basepf.buf = basebuf;
120 parselleft = parsenleft = 0; /* clear input buffer */
126 * Read a line from the script.
130 pfgets(char *line, int len)
136 while (--nleft > 0) {
154 * Read a character from the script, returning PEOF on end of file.
155 * Nul characters in the input are silently discarded.
161 return pgetc_macro();
169 parsenextc = parsefile->buf;
172 if (el != NULL && gotwinch) {
179 if (parsefile->fd == 0 && el) {
180 static const char *rl_cp;
184 rl_cp = el_gets(el, &el_len);
191 memcpy(parsenextc, rl_cp, nr);
200 nr = read(parsefile->fd, parsenextc, BUFSIZ - 1);
206 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
207 int flags = fcntl(0, F_GETFL, 0);
208 if (flags >= 0 && flags & O_NONBLOCK) {
209 flags &=~ O_NONBLOCK;
210 if (fcntl(0, F_SETFL, flags) >= 0) {
211 out2fmt_flush("sh: turning off NDELAY mode\n");
223 * Refill the input buffer and return the next input character:
225 * 1) If a string was pushed back on the input, pop it;
226 * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading
227 * from a string so we can't refill the buffer, return EOF.
228 * 3) If there is more in this buffer, use it else call read to fill it.
229 * 4) Process input up to the next newline, deleting nul characters.
240 if (parsefile->strpush) {
242 if (--parsenleft >= 0)
243 return (*parsenextc++);
245 if (parsenleft == EOF_NLEFT || parsefile->buf == NULL)
251 if (parselleft <= 0) {
252 if ((parselleft = preadfd()) == -1) {
253 parselleft = parsenleft = EOF_NLEFT;
260 /* delete nul characters */
262 for (more = 1; more;) {
273 parsenleft = q - parsenextc;
274 more = 0; /* Stop processing here */
284 if (--parselleft <= 0) {
285 parsenleft = q - parsenextc - 1;
297 if (parsefile->fd == 0 && hist && something) {
300 history(hist, &he, whichprompt == 1 ? H_ENTER : H_ADD,
313 return *parsenextc++;
317 * Returns if we are certain we are at EOF. Does not cause any more input
318 * to be read from the outside world.
326 if (parsefile->strpush)
328 if (parsenleft == EOF_NLEFT || parsefile->buf == NULL)
334 * Undo the last call to pgetc. Only one character may be pushed back.
335 * PEOF may be pushed back.
346 * Push a string back onto the input at this current parsefile level.
347 * We handle aliases this way.
350 pushstring(char *s, int len, void *ap)
355 /*out2fmt_flush("*** calling pushstring: %s, %d\n", s, len);*/
356 if (parsefile->strpush) {
357 sp = ckmalloc(sizeof (struct strpush));
358 sp->prev = parsefile->strpush;
359 parsefile->strpush = sp;
361 sp = parsefile->strpush = &(parsefile->basestrpush);
362 sp->prevstring = parsenextc;
363 sp->prevnleft = parsenleft;
364 sp->prevlleft = parselleft;
365 sp->ap = (struct alias *)ap;
367 ((struct alias *)ap)->flag |= ALIASINUSE;
376 struct strpush *sp = parsefile->strpush;
379 parsenextc = sp->prevstring;
380 parsenleft = sp->prevnleft;
381 parselleft = sp->prevlleft;
382 /*out2fmt_flush("*** calling popstring: restoring to '%s'\n", parsenextc);*/
384 sp->ap->flag &= ~ALIASINUSE;
385 parsefile->strpush = sp->prev;
386 if (sp != &(parsefile->basestrpush))
392 * Set the input to take input from a file. If push is set, push the
393 * old input onto the stack first.
397 setinputfile(const char *fname, int push)
403 if ((fd = open(fname, O_RDONLY)) < 0)
404 error("cannot open %s: %s", fname, strerror(errno));
406 fd2 = fcntl(fd, F_DUPFD, 10);
409 error("Out of file descriptors");
412 setinputfd(fd, push);
418 * Like setinputfile, but takes an open file descriptor. Call this with
423 setinputfd(int fd, int push)
425 fcntl(fd, F_SETFD, FD_CLOEXEC);
428 parsefile->buf = ckmalloc(BUFSIZ);
430 if (parsefile->fd > 0)
431 close(parsefile->fd);
433 if (parsefile->buf == NULL)
434 parsefile->buf = ckmalloc(BUFSIZ);
435 parselleft = parsenleft = 0;
441 * Like setinputfile, but takes input from a string.
445 setinputstring(char *string, int push)
451 parselleft = parsenleft = strlen(string);
452 parsefile->buf = NULL;
460 * To handle the "." command, a stack of input files is used. Pushfile
461 * adds a new entry to the stack and popfile restores the previous level.
467 struct parsefile *pf;
469 parsefile->nleft = parsenleft;
470 parsefile->lleft = parselleft;
471 parsefile->nextc = parsenextc;
472 parsefile->linno = plinno;
473 pf = (struct parsefile *)ckmalloc(sizeof (struct parsefile));
474 pf->prev = parsefile;
477 pf->basestrpush.prev = NULL;
485 struct parsefile *pf = parsefile;
494 parsefile = pf->prev;
496 parsenleft = parsefile->nleft;
497 parselleft = parsefile->lleft;
498 parsenextc = parsefile->nextc;
499 plinno = parsefile->linno;
505 * Return current file (to go back to it later using popfilesupto()).
516 * Pop files until the given file is on top again. Useful for regular
517 * builtins that read shell commands from files or strings.
518 * If the given file is not an active file, an error is raised.
522 popfilesupto(struct parsefile *file)
524 while (parsefile != file && parsefile != &basepf)
526 if (parsefile != file)
527 error("popfilesupto() misused");
531 * Return to top level.
537 while (parsefile != &basepf)
544 * Close the file(s) that the shell is reading commands from. Called
545 * after a fork is done.
552 if (parsefile->fd > 0) {
553 close(parsefile->fd);