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-rw-r--r--usr/dash/main.c346
1 files changed, 346 insertions, 0 deletions
diff --git a/usr/dash/main.c b/usr/dash/main.c
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+++ b/usr/dash/main.c
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+/*-
+ * 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 */
+}