1 files changed, 494 insertions, 0 deletions

diff --git a/src/kash/main.c b/src/kash/main.c
new file mode 100644
index 0000000..4e0517f
--- /dev/null
+++ b/src/kash/main.c
@@ -0,0 +1,494 @@
+/*	$NetBSD: main.c,v 1.48 2003/09/14 12:09:29 jmmv Exp $	*/
+
+/*-
+ * 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. 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.
+ */
+
+#if 0
+#ifndef lint
+__COPYRIGHT("@(#) Copyright (c) 1991, 1993\n\
+	The Regents of the University of California.  All rights reserved.\n");
+#endif /* not lint */
+#ifndef lint
+static char sccsid[] = "@(#)main.c	8.7 (Berkeley) 7/19/95";
+#else
+__RCSID("$NetBSD: main.c,v 1.48 2003/09/14 12:09:29 jmmv Exp $");
+#endif /* not lint */
+#endif
+
+#include <errno.h>
+#include <stdio.h>
+#include <sys/stat.h>
+#include <locale.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"
+#include "shinstance.h"
+
+#define PROFILE 0
+
+/*int rootpid;
+int rootshell;*/
+#ifdef unused_variables
+STATIC union node *curcmd;
+STATIC union node *prevcmd;
+#endif
+
+STATIC void read_profile(struct shinstance *, const char *);
+STATIC char *find_dot_file(struct shinstance *, char *);
+int main(int, char **, char **);
+SH_NORETURN_1 void shell_main(shinstance *, int, char **) SH_NORETURN_2;
+#ifdef _MSC_VER
+extern void init_syntax(void);
+#endif
+STATIC int usage(const char *argv0);
+STATIC int version(const char *argv0);
+
+/*
+ * 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
+#if K_OS == K_OS_WINDOWS && defined(SH_FORKED_MODE)
+real_main(int argc, char **argv, char **envp)
+#else
+main(int argc, char **argv, char **envp)
+#endif
+{
+	shinstance *psh;
+
+	/*
+	 * Global initializations.
+	 */
+	setlocale(LC_ALL, "");
+#ifdef _MSC_VER
+	init_syntax();
+#endif
+
+	/*
+	 * Check for --version and --help.
+	 */
+	if (argc > 1 && argv[1][0] == '-' && argv[1][1] == '-') {
+		if (!strcmp(argv[1], "--help"))
+			return usage(argv[0]);
+		if (!strcmp(argv[1], "--version"))
+			return version(argv[0]);
+	}
+
+	/*
+	 * Create the root shell instance.
+	 */
+	psh = sh_create_root_shell(argv, envp);
+	if (!psh)
+		return 2;
+	shthread_set_shell(psh);
+	shell_main(psh, argc, psh->orgargv);
+	/* Not reached. */
+	return 89;
+}
+
+SH_NORETURN_1 void
+shell_main(shinstance *psh, int argc, char **argv)
+{
+	struct jmploc jmploc;
+	struct stackmark smark;
+	volatile int state;
+	char *shinit;
+
+	state = 0;
+	if (setjmp(jmploc.loc)) {
+		/*
+		 * When a shell procedure is executed, we raise the
+		 * exception EXSHELLPROC to clean up before executing
+		 * the shell procedure.
+		 */
+		switch (psh->exception) {
+		case EXSHELLPROC:
+			psh->rootpid = /*getpid()*/ psh->pid;
+			psh->rootshell = 1;
+			psh->minusc = NULL;
+			state = 3;
+			break;
+
+		case EXEXEC:
+			psh->exitstatus = psh->exerrno;
+			break;
+
+		case EXERROR:
+			psh->exitstatus = 2;
+			break;
+
+		default:
+			break;
+		}
+
+		if (psh->exception != EXSHELLPROC) {
+			if (state == 0 || iflag(psh) == 0 || ! psh->rootshell)
+				exitshell(psh, psh->exitstatus);
+		}
+		reset(psh);
+		if (psh->exception == EXINT
+#if ATTY
+		 && (! attyset(psh) || equal(termval(psh), "emacs"))
+#endif
+		 ) {
+			out2c(psh, '\n');
+			flushout(&psh->errout);
+		}
+		popstackmark(psh, &smark);
+		FORCEINTON;				/* enable interrupts */
+		if (state == 1)
+			goto state1;
+		else if (state == 2)
+			goto state2;
+		else if (state == 3)
+			goto state3;
+		else
+			goto state4;
+	}
+	psh->handler = &jmploc;
+	psh->rootpid = /*getpid()*/ psh->pid;
+	psh->rootshell = 1;
+#ifdef DEBUG
+#if DEBUG == 2
+	debug(psh) = 1;
+#endif
+	opentrace(psh);
+	trputs(psh, "Shell args:  ");  trargs(psh, argv);
+#endif
+
+	init(psh);
+	setstackmark(psh, &smark);
+	procargs(psh, argc, argv);
+	if (argv[0] && argv[0][0] == '-') {
+		state = 1;
+		read_profile(psh, "/etc/profile");
+state1:
+		state = 2;
+		read_profile(psh, ".profile");
+	}
+state2:
+	state = 3;
+	if (sh_getuid(psh) == sh_geteuid(psh) && sh_getgid(psh) == sh_getegid(psh)) {
+		if ((shinit = lookupvar(psh, "ENV")) != NULL && *shinit != '\0') {
+			state = 3;
+			read_profile(psh, shinit);
+		}
+	}
+state3:
+	state = 4;
+	if (sflag(psh) == 0 || psh->minusc) {
+		static int sigs[] =  {
+		    SIGINT, SIGQUIT, SIGHUP,
+#ifdef SIGTSTP
+		    SIGTSTP,
+#endif
+		    SIGPIPE
+		};
+#define SIGSSIZE (sizeof(sigs)/sizeof(sigs[0]))
+		unsigned i;
+
+		for (i = 0; i < SIGSSIZE; i++)
+		    setsignal(psh, sigs[i]);
+	}
+
+	if (psh->minusc)
+		evalstring(psh, psh->minusc, 0);
+
+	if (sflag(psh) || psh->minusc == NULL) {
+state4:	/* XXX ??? - why isn't this before the "if" statement */
+		cmdloop(psh, 1);
+	}
+	exitshell(psh, psh->exitstatus);
+	/* NOTREACHED */
+}
+
+
+/*
+ * Read and execute commands.  "Top" is nonzero for the top level command
+ * loop; it turns on prompting if the shell is interactive.
+ */
+
+void
+cmdloop(struct shinstance *psh, int top)
+{
+	union node *n;
+	struct stackmark smark;
+	int inter;
+	int numeof = 0;
+
+	TRACE((psh, "cmdloop(%d) called\n", top));
+	setstackmark(psh, &smark);
+	for (;;) {
+		if (psh->pendingsigs)
+			dotrap(psh);
+		inter = 0;
+		if (iflag(psh) && top) {
+			inter = 1;
+			showjobs(psh, psh->out2, SHOW_CHANGED);
+			chkmail(psh, 0);
+			flushout(&psh->errout);
+		}
+		n = parsecmd(psh, inter);
+		/* showtree(n); DEBUG */
+		if (n == NEOF) {
+			if (!top || numeof >= 50)
+				break;
+			if (!stoppedjobs(psh)) {
+				if (!Iflag(psh))
+					break;
+				out2str(psh, "\nUse \"exit\" to leave shell.\n");
+			}
+			numeof++;
+		} else if (n != NULL && nflag(psh) == 0) {
+			psh->job_warning = (psh->job_warning == 2) ? 1 : 0;
+			numeof = 0;
+			evaltree(psh, n, 0);
+		}
+		popstackmark(psh, &smark);
+		setstackmark(psh, &smark);
+		if (psh->evalskip == SKIPFILE) {
+			psh->evalskip = 0;
+			break;
+		}
+	}
+	popstackmark(psh, &smark);
+}
+
+
+
+/*
+ * Read /etc/profile or .profile.  Return on error.
+ */
+
+STATIC void
+read_profile(struct shinstance *psh, const char *name)
+{
+	int fd;
+	int xflag_set = 0;
+	int vflag_set = 0;
+
+	INTOFF;
+	if ((fd = shfile_open(&psh->fdtab, name, O_RDONLY, 0)) >= 0)
+		setinputfd(psh, fd, 1);
+	INTON;
+	if (fd < 0)
+		return;
+	/* -q turns off -x and -v just when executing init files */
+	if (qflag(psh))  {
+	    if (xflag(psh))
+		    xflag(psh) = 0, xflag_set = 1;
+	    if (vflag(psh))
+		    vflag(psh) = 0, vflag_set = 1;
+	}
+	cmdloop(psh, 0);
+	if (qflag(psh))  {
+	    if (xflag_set)
+		    xflag(psh) = 1;
+	    if (vflag_set)
+		    vflag(psh) = 1;
+	}
+	popfile(psh);
+}
+
+
+
+/*
+ * Read a file containing shell functions.
+ */
+
+void
+readcmdfile(struct shinstance *psh, char *name)
+{
+	int fd;
+
+	INTOFF;
+	if ((fd = shfile_open(&psh->fdtab, name, O_RDONLY, 0)) >= 0)
+		setinputfd(psh, fd, 1);
+	else
+		error(psh, "Can't open %s", name);
+	INTON;
+	cmdloop(psh, 0);
+	popfile(psh);
+}
+
+
+
+/*
+ * 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(struct shinstance *psh, char *basename)
+{
+	char *fullname;
+	const char *path = pathval(psh);
+
+	/* don't try this for absolute or relative paths */
+	if (strchr(basename, '/'))
+		return basename;
+
+	while ((fullname = padvance(psh, &path, basename)) != NULL) {
+		if (shfile_stat_isreg(&psh->fdtab, fullname) > 0) {
+			/*
+			 * Don't bother freeing here, since it will
+			 * be freed by the caller.
+			 */
+			return fullname;
+		}
+		stunalloc(psh, fullname);
+	}
+
+	/* not found in the PATH */
+	error(psh, "%s: not found", basename);
+	/* NOTREACHED */
+	return NULL;
+}
+
+int
+dotcmd(struct shinstance *psh, int argc, char **argv)
+{
+	psh->exitstatus = 0;
+
+	if (argc >= 2) {		/* That's what SVR2 does */
+		char * const savedcommandname = psh->commandname;
+		int const savedcommandnamemalloc = psh->commandnamemalloc;
+		char *fullname;
+		struct stackmark smark;
+
+		setstackmark(psh, &smark);
+		fullname = find_dot_file(psh, argv[1]);
+		setinputfile(psh, fullname, 1);
+		psh->commandname = fullname;
+		psh->commandnamemalloc = 0;
+		cmdloop(psh, 0);
+		popfile(psh);
+		psh->commandname = savedcommandname;
+		psh->commandnamemalloc = savedcommandnamemalloc;
+		popstackmark(psh, &smark);
+	}
+	return psh->exitstatus;
+}
+
+
+int
+exitcmd(struct shinstance *psh, int argc, char **argv)
+{
+	if (stoppedjobs(psh))
+		return 0;
+	if (argc > 1)
+		psh->exitstatus = number(psh, argv[1]);
+	exitshell(psh, psh->exitstatus);
+	/* NOTREACHED */
+	return 1;
+}
+
+
+STATIC const char *
+strip_argv0(const char *argv0, unsigned *lenp)
+{
+	const char *tmp;
+
+	/* skip the path */
+	for (tmp = strpbrk(argv0, "\\/:"); tmp; tmp = strpbrk(argv0, "\\/:"))
+		argv0 = tmp + 1;
+
+	/* find the end, ignoring extenions */
+	tmp = strrchr(argv0, '.');
+	if (!tmp)
+		tmp = strchr(argv0, '\0');
+	*lenp = (unsigned)(tmp - argv0);
+	return argv0;
+}
+
+STATIC int
+usage(const char *argv0)
+{
+	unsigned len;
+	argv0 = strip_argv0(argv0, &len);
+
+	fprintf(stdout,
+			"usage: %.*s [-aCefnuvxIimqVEb] [+aCefnuvxIimqVEb] [-o option_name]\n"
+		    "               [+o option_name] [command_file [argument ...]]\n"
+		    "   or: %.*s -c [-aCefnuvxIimqVEb] [+aCefnuvxIimqVEb] [-o option_name]\n"
+		    "               [+o option_name] command_string [command_name [argument ...]]\n"
+		    "   or: %.*s -s [-aCefnuvxIimqVEb] [+aCefnuvxIimqVEb] [-o option_name]\n"
+		    "               [+o option_name] [argument ...]\n"
+		    "   or: %.*s --help\n"
+		    "   or: %.*s --version\n",
+		    len, argv0, len, argv0, len, argv0, len, argv0, len, argv0);
+	return 0;
+}
+
+STATIC int
+version(const char *argv0)
+{
+	unsigned len;
+	strip_argv0(argv0, &len);
+
+	fprintf(stdout,
+			"%.*s - kBuild version %d.%d.%d (r%u)\n",
+		    len, argv0,
+		    KBUILD_VERSION_MAJOR, KBUILD_VERSION_MINOR, KBUILD_VERSION_PATCH, KBUILD_SVN_REV);
+	return 0;
+}
+
+
+/*
+ * Local Variables:
+ *   c-file-style: bsd
+ * End:
+ */