minix/commands/ash/main.c

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2005-04-21 16:53:53 +02:00
/*-
* Copyright (c) 1991 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
char copyright[] =
"@(#) Copyright (c) 1991 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)main.c 5.2 (Berkeley) 3/13/91";
#endif /* not lint */
#include <sys/types.h>
#include <signal.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 "eval.h"
#include "jobs.h"
#include "input.h"
#include "trap.h"
#if ATTY
#include "var.h"
#endif
#include "memalloc.h"
#include "error.h"
#include "init.h"
#include "mystring.h"
#define PROFILE 0
int rootpid;
int rootshell;
STATIC union node *curcmd;
STATIC union node *prevcmd;
extern int errno;
#if PROFILE
short profile_buf[16384];
extern int etext();
#endif
#ifdef __STDC__
STATIC void read_profile(char *);
char *getenv(char *);
#else
STATIC void read_profile();
char *getenv();
#endif
/*
* 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.
*/
main(argc, argv) char **argv; {
struct jmploc jmploc;
struct stackmark smark;
volatile int state;
char *shinit, *home;
char *profile = NULL, *ashrc = NULL;
#if PROFILE
monitor(4, etext, profile_buf, sizeof profile_buf, 50);
#endif
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.
*/
if (exception == EXSHELLPROC) {
rootpid = getpid();
rootshell = 1;
minusc = NULL;
state = 3;
} else if (state == 0 || iflag == 0 || ! rootshell)
exitshell(2);
reset();
#if ATTY
if (exception == EXINT
&& (! attyset() || equal(termval(), "emacs"))) {
#else
if (exception == EXINT) {
#endif
out2c('\n');
flushout(&errout);
}
popstackmark(&smark);
FORCEINTON; /* enable interrupts */
if (state == 1)
goto state1;
else if (state == 2)
goto state2;
else if (state == 3)
goto state3;
else
goto state4;
}
handler = &jmploc;
#if DEBUG
opentrace();
trputs("Shell args: "); trargs(argv);
#endif
rootpid = getpid();
rootshell = 1;
init();
setstackmark(&smark);
procargs(argc, argv);
if (eflag) eflag = 2; /* Truly enable [ex]flag after init. */
if (xflag) xflag = 2;
if (argv[0] && argv[0][0] == '-') {
state = 1;
read_profile("/etc/profile");
state1:
state = 2;
if ((home = getenv("HOME")) != NULL
&& (profile = (char *) malloc(strlen(home) + 10)) != NULL)
{
strcpy(profile, home);
strcat(profile, "/.profile");
read_profile(profile);
} else {
read_profile(".profile");
}
} else if ((sflag || minusc) && (shinit = getenv("SHINIT")) != NULL) {
state = 2;
evalstring(shinit);
}
state2:
if (profile != NULL) free(profile);
state = 3;
if (!argv[0] || argv[0][0] != '-') {
if ((home = getenv("HOME")) != NULL
&& (ashrc = (char *) malloc(strlen(home) + 8)) != NULL)
{
strcpy(ashrc, home);
strcat(ashrc, "/.ashrc");
read_profile(ashrc);
}
}
state3:
if (ashrc != NULL) free(ashrc);
if (eflag) eflag = 1; /* Init done, enable [ex]flag */
if (xflag) xflag = 1;
exitstatus = 0; /* Init shouldn't influence initial $? */
state = 4;
if (minusc) {
evalstring(minusc);
}
if (sflag || minusc == NULL) {
state4:
cmdloop(1);
}
#if PROFILE
monitor(0);
#endif
exitshell(exitstatus);
}
/*
* Read and execute commands. "Top" is nonzero for the top level command
* loop; it turns on prompting if the shell is interactive.
*/
void
cmdloop(top) {
union node *n;
struct stackmark smark;
int inter;
int numeof;
TRACE(("cmdloop(%d) called\n", top));
setstackmark(&smark);
numeof = 0;
for (;;) {
if (pendingsigs)
dotrap();
inter = 0;
if (iflag && top) {
inter++;
showjobs(1);
chkmail(0);
flushout(&output);
}
n = parsecmd(inter);
#if DEBUG
/* showtree(n); */
#endif
if (n == NEOF) {
if (Iflag == 0 || numeof >= 50)
break;
out2str("\nUse \"exit\" to leave shell.\n");
numeof++;
} else if (n != NULL && nflag == 0) {
if (inter) {
INTOFF;
if (prevcmd)
freefunc(prevcmd);
prevcmd = curcmd;
curcmd = copyfunc(n);
INTON;
}
evaltree(n, 0);
#ifdef notdef
if (exitstatus) /*DEBUG*/
outfmt(&errout, "Exit status 0x%X\n", exitstatus);
#endif
}
popstackmark(&smark);
}
popstackmark(&smark); /* unnecessary */
}
/*
* Read /etc/profile or .profile. Return on error.
*/
STATIC void
read_profile(name)
char *name;
{
int fd;
INTOFF;
if ((fd = open(name, O_RDONLY)) >= 0)
setinputfd(fd, 1);
INTON;
if (fd < 0)
return;
cmdloop(0);
popfile();
}
/*
* Read a file containing shell functions.
*/
void
readcmdfile(name)
char *name;
{
int fd;
INTOFF;
if ((fd = open(name, O_RDONLY)) >= 0)
setinputfd(fd, 1);
else
error("Can't open %s", name);
INTON;
cmdloop(0);
popfile();
}
/*
* Take commands from a file. To be compatable we should do a path
* search for the file, but a path search doesn't make any sense.
*/
dotcmd(argc, argv) char **argv; {
exitstatus = 0;
if (argc >= 2) { /* That's what SVR2 does */
setinputfile(argv[1], 1);
commandname = argv[1];
cmdloop(0);
popfile();
}
return exitstatus;
}
exitcmd(argc, argv) char **argv; {
if (argc > 1)
exitstatus = number(argv[1]);
exitshell(exitstatus);
}
lccmd(argc, argv) char **argv; {
if (argc > 1) {
defun(argv[1], prevcmd);
return 0;
} else {
INTOFF;
freefunc(curcmd);
curcmd = prevcmd;
prevcmd = NULL;
INTON;
evaltree(curcmd, 0);
return exitstatus;
}
}
#ifdef notdef
/*
* Should never be called.
*/
void
exit(exitstatus) {
_exit(exitstatus);
}
#endif