1 files changed, 346 insertions, 0 deletions
diff --git a/usr/dash/main.c b/usr/dash/main.c
new file mode 100644
index 0000000..7df3c44
--- /dev/null
+++ b/usr/dash/main.c
@@ -0,0 +1,346 @@
+/*-
+ * Copyright (c) 1991, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ * Copyright (c) 1997-2005
+ *	Herbert Xu <herbert@gondor.apana.org.au>.  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. 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.
+ */
+
+#include <stdio.h>
+#include <signal.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+
+#include "shell.h"
+#include "main.h"
+#include "mail.h"
+#include "options.h"
+#include "output.h"
+#include "parser.h"
+#include "nodes.h"
+#include "expand.h"
+#include "eval.h"
+#include "jobs.h"
+#include "input.h"
+#include "trap.h"
+#include "var.h"
+#include "show.h"
+#include "memalloc.h"
+#include "error.h"
+#include "init.h"
+#include "mystring.h"
+#include "exec.h"
+#include "cd.h"
+
+#ifdef HETIO
+#include "hetio.h"
+#endif
+
+#define PROFILE 0
+
+int rootpid;
+int shlvl;
+#ifdef __GLIBC__
+int *dash_errno;
+#endif
+#if PROFILE
+short profile_buf[16384];
+extern int etext();
+#endif
+
+STATIC void read_profile(const char *);
+STATIC char *find_dot_file(char *);
+static int cmdloop(int);
+int main(int, char **);
+
+/*
+ * Main routine.  We initialize things, parse the arguments, execute
+ * profiles if we're a login shell, and then call cmdloop to execute
+ * commands.  The setjmp call sets up the location to jump to when an
+ * exception occurs.  When an exception occurs the variable "state"
+ * is used to figure out how far we had gotten.
+ */
+
+int
+main(int argc, char **argv)
+{
+	char *shinit;
+	volatile int state;
+	struct jmploc jmploc;
+	struct stackmark smark;
+	int login;
+
+#ifdef __GLIBC__
+	dash_errno = __errno_location();
+#endif
+
+#if PROFILE
+	monitor(4, etext, profile_buf, sizeof profile_buf, 50);
+#endif
+	state = 0;
+	if (unlikely(setjmp(jmploc.loc))) {
+		int e;
+		int s;
+
+		reset();
+
+		e = exception;
+
+		s = state;
+		if (e == EXEXIT || s == 0 || iflag == 0 || shlvl)
+			exitshell();
+
+		if (e == EXINT
+#if ATTY
+		 && (! attyset() || equal(termval(), "emacs"))
+#endif
+		 ) {
+			out2c('\n');
+#ifdef FLUSHERR
+			flushout(out2);
+#endif
+		}
+		popstackmark(&smark);
+		FORCEINTON;				/* enable interrupts */
+		if (s == 1)
+			goto state1;
+		else if (s == 2)
+			goto state2;
+		else if (s == 3)
+			goto state3;
+		else
+			goto state4;
+	}
+	handler = &jmploc;
+#ifdef DEBUG
+	opentrace();
+	trputs("Shell args:  ");  trargs(argv);
+#endif
+	rootpid = getpid();
+	init();
+	setstackmark(&smark);
+	login = procargs(argc, argv);
+	if (login) {
+		state = 1;
+		read_profile("/etc/profile");
+state1:
+		state = 2;
+		read_profile("$HOME/.profile");
+	}
+state2:
+	state = 3;
+	if (
+#ifndef linux
+		getuid() == geteuid() && getgid() == getegid() &&
+#endif
+		iflag
+	) {
+		if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') {
+			read_profile(shinit);
+		}
+	}
+	popstackmark(&smark);
+state3:
+	state = 4;
+	if (minusc)
+		evalstring(minusc, 0);
+
+	if (sflag || minusc == NULL) {
+state4:	/* XXX ??? - why isn't this before the "if" statement */
+		cmdloop(1);
+	}
+#if PROFILE
+	monitor(0);
+#endif
+#if GPROF
+	{
+		extern void _mcleanup(void);
+		_mcleanup();
+	}
+#endif
+	exitshell();
+	/* NOTREACHED */
+}
+
+
+/*
+ * Read and execute commands.  "Top" is nonzero for the top level command
+ * loop; it turns on prompting if the shell is interactive.
+ */
+
+static int
+cmdloop(int top)
+{
+	union node *n;
+	struct stackmark smark;
+	int inter;
+	int status = 0;
+	int numeof = 0;
+
+	TRACE(("cmdloop(%d) called\n", top));
+#ifdef HETIO
+	if(iflag && top)
+		hetio_init();
+#endif
+	for (;;) {
+		int skip;
+
+		setstackmark(&smark);
+		if (jobctl)
+			showjobs(out2, SHOW_CHANGED);
+		inter = 0;
+		if (iflag && top) {
+			inter++;
+			chkmail();
+		}
+		n = parsecmd(inter);
+		/* showtree(n); DEBUG */
+		if (n == NEOF) {
+			if (!top || numeof >= 50)
+				break;
+			if (!stoppedjobs()) {
+				if (!Iflag)
+					break;
+				out2str("\nUse \"exit\" to leave shell.\n");
+			}
+			numeof++;
+		} else if (nflag == 0) {
+			job_warning = (job_warning == 2) ? 1 : 0;
+			numeof = 0;
+			evaltree(n, 0);
+			status = exitstatus;
+		}
+		popstackmark(&smark);
+
+		skip = evalskip;
+		if (skip) {
+			evalskip &= ~SKIPFUNC;
+			break;
+		}
+	}
+
+	return status;
+}
+
+
+
+/*
+ * Read /etc/profile or .profile.  Return on error.
+ */
+
+STATIC void
+read_profile(const char *name)
+{
+	name = expandstr(name);
+	if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
+		return;
+
+	cmdloop(0);
+	popfile();
+}
+
+
+
+/*
+ * Read a file containing shell functions.
+ */
+
+void
+readcmdfile(char *name)
+{
+	setinputfile(name, INPUT_PUSH_FILE);
+	cmdloop(0);
+	popfile();
+}
+
+
+
+/*
+ * Take commands from a file.  To be compatible we should do a path
+ * search for the file, which is necessary to find sub-commands.
+ */
+
+
+STATIC char *
+find_dot_file(char *basename)
+{
+	char *fullname;
+	const char *path = pathval();
+	struct stat statb;
+
+	/* don't try this for absolute or relative paths */
+	if (strchr(basename, '/'))
+		return basename;
+
+	while ((fullname = padvance(&path, basename)) != NULL) {
+		if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
+			/*
+			 * Don't bother freeing here, since it will
+			 * be freed by the caller.
+			 */
+			return fullname;
+		}
+		stunalloc(fullname);
+	}
+
+	/* not found in the PATH */
+	sh_error("%s: not found", basename);
+	/* NOTREACHED */
+}
+
+int
+dotcmd(int argc, char **argv)
+{
+	int status = 0;
+
+	if (argc >= 2) {		/* That's what SVR2 does */
+		char *fullname;
+
+		fullname = find_dot_file(argv[1]);
+		setinputfile(fullname, INPUT_PUSH_FILE);
+		commandname = fullname;
+		status = cmdloop(0);
+		popfile();
+	}
+	return status;
+}
+
+
+int
+exitcmd(int argc, char **argv)
+{
+	if (stoppedjobs())
+		return 0;
+	if (argc > 1)
+		exitstatus = number(argv[1]);
+	exraise(EXEXIT);
+	/* NOTREACHED */
+}