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36 * @(#)input.c 8.3 (Berkeley) 6/9/95
37 * $FreeBSD: src/bin/sh/input.c,v 1.23 2006/04/29 10:29:10 stefanf Exp $
38 * $DragonFly: src/bin/sh/input.c,v 1.8 2007/01/13 20:10:26 pavalos Exp $
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 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 MKINIT 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);
116 basepf.nextc = basepf.buf = basebuf;
120 if (exception != EXSHELLPROC)
121 parselleft = parsenleft = 0; /* clear input buffer */
132 * Read a line from the script.
136 pfgets(char *line, int len)
142 while (--nleft > 0) {
160 * Read a character from the script, returning PEOF on end of file.
161 * Nul characters in the input are silently discarded.
167 return pgetc_macro();
175 parsenextc = parsefile->buf;
178 if (el != NULL && gotwinch) {
185 if (parsefile->fd == 0 && el) {
186 static const char *rl_cp;
190 rl_cp = el_gets(el, &el_len);
197 memcpy(parsenextc, rl_cp, nr);
206 nr = read(parsefile->fd, parsenextc, BUFSIZ - 1);
212 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
213 int flags = fcntl(0, F_GETFL, 0);
214 if (flags >= 0 && flags & O_NONBLOCK) {
215 flags &=~ O_NONBLOCK;
216 if (fcntl(0, F_SETFL, flags) >= 0) {
217 out2str("sh: turning off NDELAY mode\n");
229 * Refill the input buffer and return the next input character:
231 * 1) If a string was pushed back on the input, pop it;
232 * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading
233 * from a string so we can't refill the buffer, return EOF.
234 * 3) If there is more in this buffer, use it else call read to fill it.
235 * 4) Process input up to the next newline, deleting nul characters.
246 if (parsefile->strpush) {
248 if (--parsenleft >= 0)
249 return (*parsenextc++);
251 if (parsenleft == EOF_NLEFT || parsefile->buf == NULL)
257 if (parselleft <= 0) {
258 if ((parselleft = preadfd()) == -1) {
259 parselleft = parsenleft = EOF_NLEFT;
266 /* delete nul characters */
268 for (more = 1; more;) {
279 parsenleft = q - parsenextc;
280 more = 0; /* Stop processing here */
290 if (--parselleft <= 0) {
291 parsenleft = q - parsenextc - 1;
303 if (parsefile->fd == 0 && hist && something) {
306 history(hist, &he, whichprompt == 1 ? H_ENTER : H_APPEND, parsenextc);
318 return *parsenextc++;
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, void *ap)
343 /*dprintf("*** 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;
353 sp->ap = (struct alias *)ap;
355 ((struct alias *)ap)->flag |= ALIASINUSE;
364 struct strpush *sp = parsefile->strpush;
367 parsenextc = sp->prevstring;
368 parsenleft = sp->prevnleft;
369 parselleft = sp->prevlleft;
370 /*dprintf("*** 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)) < 0)
392 error("Can't open %s: %s", fname, strerror(errno));
394 fd2 = fcntl(fd, F_DUPFD, 10);
397 error("Out of file descriptors");
400 setinputfd(fd, push);
406 * Like setinputfile, but takes an open file descriptor. Call this with
411 setinputfd(int fd, int push)
413 fcntl(fd, F_SETFD, FD_CLOEXEC);
416 parsefile->buf = ckmalloc(BUFSIZ);
418 if (parsefile->fd > 0)
419 close(parsefile->fd);
421 if (parsefile->buf == NULL)
422 parsefile->buf = ckmalloc(BUFSIZ);
423 parselleft = parsenleft = 0;
429 * Like setinputfile, but takes input from a string.
433 setinputstring(char *string, int push)
439 parselleft = parsenleft = strlen(string);
440 parsefile->buf = NULL;
448 * To handle the "." command, a stack of input files is used. Pushfile
449 * adds a new entry to the stack and popfile restores the previous level.
455 struct parsefile *pf;
457 parsefile->nleft = parsenleft;
458 parsefile->lleft = parselleft;
459 parsefile->nextc = parsenextc;
460 parsefile->linno = plinno;
461 pf = (struct parsefile *)ckmalloc(sizeof (struct parsefile));
462 pf->prev = parsefile;
465 pf->basestrpush.prev = NULL;
473 struct parsefile *pf = parsefile;
482 parsefile = pf->prev;
484 parsenleft = parsefile->nleft;
485 parselleft = parsefile->lleft;
486 parsenextc = parsefile->nextc;
487 plinno = parsefile->linno;
493 * Return to top level.
499 while (parsefile != &basepf)
506 * Close the file(s) that the shell is reading commands from. Called
507 * after a fork is done.
514 if (parsefile->fd > 0) {
515 close(parsefile->fd);