BSD 4.4 Lite bin Sources

1 files changed, 474 insertions, 0 deletions

diff --git a/bin/sh/input.c b/bin/sh/input.c
new file mode 100644
index 0000000..d1d84e1
--- /dev/null
+++ b/bin/sh/input.c
@@ -0,0 +1,474 @@
+/*-
+ * Copyright (c) 1991, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#)input.c	8.1 (Berkeley) 5/31/93";
+#endif /* not lint */
+
+/*
+ * This file implements the input routines used by the parser.
+ */
+
+#include <stdio.h>	/* defines BUFSIZ */
+#include "shell.h"
+#include <fcntl.h>
+#include <errno.h>
+#include "syntax.h"
+#include "input.h"
+#include "output.h"
+#include "options.h"
+#include "memalloc.h"
+#include "error.h"
+#include "alias.h"
+#include "parser.h"
+#include "myhistedit.h"
+
+#define EOF_NLEFT -99		/* value of parsenleft when EOF pushed back */
+
+MKINIT
+struct strpush {
+	struct strpush *prev;	/* preceding string on stack */
+	char *prevstring;
+	int prevnleft;
+	struct alias *ap;	/* if push was associated with an alias */
+};
+
+/*
+ * The parsefile structure pointed to by the global variable parsefile
+ * contains information about the current file being read.
+ */
+
+MKINIT
+struct parsefile {
+	struct parsefile *prev;	/* preceding file on stack */
+	int linno;		/* current line */
+	int fd;			/* file descriptor (or -1 if string) */
+	int nleft;		/* number of chars left in buffer */
+	char *nextc;		/* next char in buffer */
+	char *buf;		/* input buffer */
+	struct strpush *strpush; /* for pushing strings at this level */
+	struct strpush basestrpush; /* so pushing one is fast */
+};
+
+
+int plinno = 1;			/* input line number */
+MKINIT int parsenleft;		/* copy of parsefile->nleft */
+char *parsenextc;		/* copy of parsefile->nextc */
+MKINIT struct parsefile basepf;	/* top level input file */
+char basebuf[BUFSIZ];		/* buffer for top level input file */
+struct parsefile *parsefile = &basepf;	/* current input file */
+char *pushedstring;		/* copy of parsenextc when text pushed back */
+int pushednleft;		/* copy of parsenleft when text pushed back */
+int init_editline = 0;		/* editline library initialized? */
+int whichprompt;		/* 1 == PS1, 2 == PS2 */
+
+EditLine *el;			/* cookie for editline package */
+
+#ifdef __STDC__
+STATIC void pushfile(void);
+#else
+STATIC void pushfile();
+#endif
+
+
+
+#ifdef mkinit
+INCLUDE "input.h"
+INCLUDE "error.h"
+
+INIT {
+	extern char basebuf[];
+
+	basepf.nextc = basepf.buf = basebuf;
+}
+
+RESET {
+	if (exception != EXSHELLPROC)
+		parsenleft = 0;            /* clear input buffer */
+	popallfiles();
+}
+
+SHELLPROC {
+	popallfiles();
+}
+#endif
+
+
+/*
+ * Read a line from the script.
+ */
+
+char *
+pfgets(line, len)
+	char *line;
+	{
+	register char *p = line;
+	int nleft = len;
+	int c;
+
+	while (--nleft > 0) {
+		c = pgetc_macro();
+		if (c == PEOF) {
+			if (p == line)
+				return NULL;
+			break;
+		}
+		*p++ = c;
+		if (c == '\n')
+			break;
+	}
+	*p = '\0';
+	return line;
+}
+
+
+
+/*
+ * Read a character from the script, returning PEOF on end of file.
+ * Nul characters in the input are silently discarded.
+ */
+
+int
+pgetc() {
+	return pgetc_macro();
+}
+
+
+/*
+ * Refill the input buffer and return the next input character:
+ *
+ * 1) If a string was pushed back on the input, pop it;
+ * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading
+ *    from a string so we can't refill the buffer, return EOF.
+ * 3) Call read to read in the characters.
+ * 4) Delete all nul characters from the buffer.
+ */
+
+int
+preadbuffer() {
+	register char *p, *q;
+	register int i;
+	register int something;
+	extern EditLine *el;
+
+	if (parsefile->strpush) {
+		popstring();
+		if (--parsenleft >= 0)
+			return (*parsenextc++);
+	}
+	if (parsenleft == EOF_NLEFT || parsefile->buf == NULL)
+		return PEOF;
+	flushout(&output);
+	flushout(&errout);
+retry:
+	p = parsenextc = parsefile->buf;
+	if (parsefile->fd == 0 && el) {
+		const char *rl_cp;
+		int len;
+
+		rl_cp = el_gets(el, &len);
+		if (rl_cp == NULL) {
+			i = 0;
+			goto eof;
+		}
+		strcpy(p, rl_cp);  /* XXX - BUFSIZE should redesign so not necessary */
+		i = len;
+
+	} else {
+regular_read:
+		i = read(parsefile->fd, p, BUFSIZ - 1);
+	}
+eof:
+	if (i <= 0) {
+                if (i < 0) {
+                        if (errno == EINTR)
+                                goto retry;
+                        if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
+                                int flags = fcntl(0, F_GETFL, 0);
+                                if (flags >= 0 && flags & O_NONBLOCK) {
+                                        flags &=~ O_NONBLOCK;
+                                        if (fcntl(0, F_SETFL, flags) >= 0) {
+						out2str("sh: turning off NDELAY mode\n");
+                                                goto retry;
+                                        }
+                                }
+                        }
+                }
+                parsenleft = EOF_NLEFT;
+                return PEOF;
+	}
+	parsenleft = i - 1;	/* we're returning one char in this call */
+
+	/* delete nul characters */
+	something = 0;
+	for (;;) {
+		if (*p == '\0')
+			break;
+		if (*p != ' ' && *p != '\t' && *p != '\n')
+			something = 1;
+		p++;
+		if (--i <= 0) {
+			*p = '\0';
+			goto done;		/* no nul characters */
+		}
+	}
+	/*
+	 * remove nuls
+	 */
+	q = p++;
+	while (--i > 0) {
+		if (*p != '\0')
+			*q++ = *p;
+		p++;
+	}
+	*q = '\0';
+	if (q == parsefile->buf)
+		goto retry;			/* buffer contained nothing but nuls */
+	parsenleft = q - parsefile->buf - 1;
+
+done:
+	if (parsefile->fd == 0 && hist && something) {
+		INTOFF;
+		history(hist, whichprompt == 1 ? H_ENTER : H_ADD, 
+			   parsefile->buf);
+		INTON;
+	}
+	if (vflag) {
+		/*
+		 * This isn't right.  Most shells coordinate it with
+		 * reading a line at a time.  I honestly don't know if its
+		 * worth it.
+		 */
+		i = parsenleft + 1;
+		p = parsefile->buf;
+		for (; i--; p++) 
+			out2c(*p)
+		flushout(out2);
+	}
+	return *parsenextc++;
+}
+
+/*
+ * Undo the last call to pgetc.  Only one character may be pushed back.
+ * PEOF may be pushed back.
+ */
+
+void
+pungetc() {
+	parsenleft++;
+	parsenextc--;
+}
+
+/*
+ * Push a string back onto the input at this current parsefile level.
+ * We handle aliases this way.
+ */
+void
+pushstring(s, len, ap)
+	char *s;
+	int len;
+	void *ap;
+	{
+	struct strpush *sp;
+
+	INTOFF;
+/*dprintf("*** calling pushstring: %s, %d\n", s, len);*/
+	if (parsefile->strpush) {
+		sp = ckmalloc(sizeof (struct strpush));
+		sp->prev = parsefile->strpush;
+		parsefile->strpush = sp;
+	} else
+		sp = parsefile->strpush = &(parsefile->basestrpush);
+	sp->prevstring = parsenextc;
+	sp->prevnleft = parsenleft;
+	sp->ap = (struct alias *)ap;
+	if (ap)
+		((struct alias *)ap)->flag |= ALIASINUSE;
+	parsenextc = s;
+	parsenleft = len;
+	INTON;
+}
+
+popstring()
+{
+	struct strpush *sp = parsefile->strpush;
+
+	INTOFF;
+	parsenextc = sp->prevstring;
+	parsenleft = sp->prevnleft;
+/*dprintf("*** calling popstring: restoring to '%s'\n", parsenextc);*/
+	if (sp->ap)
+		sp->ap->flag &= ~ALIASINUSE;
+	parsefile->strpush = sp->prev;
+	if (sp != &(parsefile->basestrpush))
+		ckfree(sp);
+	INTON;
+}
+
+/*
+ * Set the input to take input from a file.  If push is set, push the
+ * old input onto the stack first.
+ */
+
+void
+setinputfile(fname, push)
+	char *fname;
+	{
+	int fd;
+	int fd2;
+
+	INTOFF;
+	if ((fd = open(fname, O_RDONLY)) < 0)
+		error("Can't open %s", fname);
+	if (fd < 10) {
+		fd2 = copyfd(fd, 10);
+		close(fd);
+		if (fd2 < 0)
+			error("Out of file descriptors");
+		fd = fd2;
+	}
+	setinputfd(fd, push);
+	INTON;
+}
+
+
+/*
+ * Like setinputfile, but takes an open file descriptor.  Call this with
+ * interrupts off.
+ */
+
+void
+setinputfd(fd, push) {
+	if (push) {
+		pushfile();
+		parsefile->buf = ckmalloc(BUFSIZ);
+	}
+	if (parsefile->fd > 0)
+		close(parsefile->fd);
+	parsefile->fd = fd;
+	if (parsefile->buf == NULL)
+		parsefile->buf = ckmalloc(BUFSIZ);
+	parsenleft = 0;
+	plinno = 1;
+}
+
+
+/*
+ * Like setinputfile, but takes input from a string.
+ */
+
+void
+setinputstring(string, push)
+	char *string;
+	{
+	INTOFF;
+	if (push)
+		pushfile();
+	parsenextc = string;
+	parsenleft = strlen(string);
+	parsefile->buf = NULL;
+	plinno = 1;
+	INTON;
+}
+
+
+
+/*
+ * To handle the "." command, a stack of input files is used.  Pushfile
+ * adds a new entry to the stack and popfile restores the previous level.
+ */
+
+STATIC void
+pushfile() {
+	struct parsefile *pf;
+
+	parsefile->nleft = parsenleft;
+	parsefile->nextc = parsenextc;
+	parsefile->linno = plinno;
+	pf = (struct parsefile *)ckmalloc(sizeof (struct parsefile));
+	pf->prev = parsefile;
+	pf->fd = -1;
+	pf->strpush = NULL;
+	pf->basestrpush.prev = NULL;
+	parsefile = pf;
+}
+
+
+void
+popfile() {
+	struct parsefile *pf = parsefile;
+
+	INTOFF;
+	if (pf->fd >= 0)
+		close(pf->fd);
+	if (pf->buf)
+		ckfree(pf->buf);
+	while (pf->strpush)
+		popstring();
+	parsefile = pf->prev;
+	ckfree(pf);
+	parsenleft = parsefile->nleft;
+	parsenextc = parsefile->nextc;
+	plinno = parsefile->linno;
+	INTON;
+}
+
+
+/*
+ * Return to top level.
+ */
+
+void
+popallfiles() {
+	while (parsefile != &basepf)
+		popfile();
+}
+
+
+
+/*
+ * Close the file(s) that the shell is reading commands from.  Called
+ * after a fork is done.
+ */
+
+void
+closescript() {
+	popallfiles();
+	if (parsefile->fd > 0) {
+		close(parsefile->fd);
+		parsefile->fd = 0;
+	}
+}