1 files changed, 594 insertions, 0 deletions

diff --git a/bin/1sh/options.c b/bin/1sh/options.c
new file mode 100644
index 00000000..6327bd1d
--- /dev/null
+++ b/bin/1sh/options.c
@@ -0,0 +1,594 @@
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * 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.
+ */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)options.c	8.2 (Berkeley) 5/4/95";
+#endif
+#endif /* not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: releng/12.1/bin/sh/options.c 326025 2017-11-20 19:49:47Z pfg $");
+
+#include <signal.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+#include "shell.h"
+#define DEFINE_OPTIONS
+#include "options.h"
+#undef DEFINE_OPTIONS
+#include "nodes.h"	/* for other header files */
+#include "eval.h"
+#include "jobs.h"
+#include "input.h"
+#include "output.h"
+#include "trap.h"
+#include "var.h"
+#include "memalloc.h"
+#include "error.h"
+#include "mystring.h"
+#include "builtins.h"
+#ifndef NO_HISTORY
+#include "myhistedit.h"
+#endif
+
+char *arg0;			/* value of $0 */
+struct shparam shellparam;	/* current positional parameters */
+char **argptr;			/* argument list for builtin commands */
+char *shoptarg;			/* set by nextopt (like getopt) */
+char *nextopt_optptr;		/* used by nextopt */
+
+char *minusc;			/* argument to -c option */
+
+
+static void options(int);
+static void minus_o(char *, int);
+static void setoption(int, int);
+static void setoptionbyindex(int, int);
+static void setparam(int, char **);
+static int getopts(char *, char *, char **, char ***, char **);
+
+
+/*
+ * Process the shell command line arguments.
+ */
+
+void
+procargs(int argc, char **argv)
+{
+	int i;
+	char *scriptname;
+
+	argptr = argv;
+	if (argc > 0)
+		argptr++;
+	for (i = 0; i < NOPTS; i++)
+		optval[i] = 2;
+	privileged = (getuid() != geteuid() || getgid() != getegid());
+	options(1);
+	if (*argptr == NULL && minusc == NULL)
+		sflag = 1;
+	if (iflag != 0 && sflag == 1 && isatty(0) && isatty(1)) {
+		iflag = 1;
+		if (Eflag == 2)
+			Eflag = 1;
+	}
+	if (mflag == 2)
+		mflag = iflag;
+	for (i = 0; i < NOPTS; i++)
+		if (optval[i] == 2)
+			optval[i] = 0;
+	arg0 = argv[0];
+	if (sflag == 0 && minusc == NULL) {
+		scriptname = *argptr++;
+		setinputfile(scriptname, 0);
+		commandname = arg0 = scriptname;
+	}
+	/* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
+	if (argptr && minusc && *argptr)
+		arg0 = *argptr++;
+
+	shellparam.p = argptr;
+	shellparam.reset = 1;
+	/* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
+	while (*argptr) {
+		shellparam.nparam++;
+		argptr++;
+	}
+	optschanged();
+}
+
+
+void
+optschanged(void)
+{
+	setinteractive();
+#ifndef NO_HISTORY
+	histedit();
+#endif
+	setjobctl(mflag);
+}
+
+/*
+ * Process shell options.  The global variable argptr contains a pointer
+ * to the argument list; we advance it past the options.
+ * If cmdline is true, process the shell's argv; otherwise, process arguments
+ * to the set special builtin.
+ */
+
+static void
+options(int cmdline)
+{
+	char *kp, *p;
+	int val;
+	int c;
+
+	if (cmdline)
+		minusc = NULL;
+	while ((p = *argptr) != NULL) {
+		argptr++;
+		if ((c = *p++) == '-') {
+			val = 1;
+			/* A "-" or  "--" terminates options */
+			if (p[0] == '\0')
+				goto end_options1;
+			if (p[0] == '-' && p[1] == '\0')
+				goto end_options2;
+			/**
+			 * For the benefit of `#!' lines in shell scripts,
+			 * treat a string of '-- *#.*' the same as '--'.
+			 * This is needed so that a script starting with:
+			 *	#!/bin/sh -- # -*- perl -*-
+			 * will continue to work after a change is made to
+			 * kern/imgact_shell.c to NOT token-ize the options
+			 * specified on a '#!' line.  A bit of a kludge,
+			 * but that trick is recommended in documentation
+			 * for some scripting languages, and we might as
+			 * well continue to support it.
+			 */
+			if (p[0] == '-') {
+				kp = p + 1;
+				while (*kp == ' ' || *kp == '\t')
+					kp++;
+				if (*kp == '#' || *kp == '\0')
+					goto end_options2;
+			}
+		} else if (c == '+') {
+			val = 0;
+		} else {
+			argptr--;
+			break;
+		}
+		while ((c = *p++) != '\0') {
+			if (c == 'c' && cmdline) {
+				char *q;
+
+				q = *argptr++;
+				if (q == NULL || minusc != NULL)
+					error("Bad -c option");
+				minusc = q;
+			} else if (c == 'o') {
+				minus_o(*argptr, val);
+				if (*argptr)
+					argptr++;
+			} else
+				setoption(c, val);
+		}
+	}
+	return;
+
+	/* When processing `set', a single "-" means turn off -x and -v */
+end_options1:
+	if (!cmdline) {
+		xflag = vflag = 0;
+		return;
+	}
+
+	/*
+	 * When processing `set', a "--" means the remaining arguments
+	 * replace the positional parameters in the active shell.  If
+	 * there are no remaining options, then all the positional
+	 * parameters are cleared (equivalent to doing ``shift $#'').
+	 */
+end_options2:
+	if (!cmdline) {
+		if (*argptr == NULL)
+			setparam(0, argptr);
+		return;
+	}
+
+	/*
+	 * At this point we are processing options given to 'sh' on a command
+	 * line.  If an end-of-options marker ("-" or "--") is followed by an
+	 * arg of "#", then skip over all remaining arguments.  Some scripting
+	 * languages (e.g.: perl) document that /bin/sh will implement this
+	 * behavior, and they recommend that users take advantage of it to
+	 * solve certain issues that can come up when writing a perl script.
+	 * Yes, this feature is in /bin/sh to help users write perl scripts.
+	 */
+	p = *argptr;
+	if (p != NULL && p[0] == '#' && p[1] == '\0') {
+		while (*argptr != NULL)
+			argptr++;
+		/* We need to keep the final argument */
+		argptr--;
+	}
+}
+
+static void
+minus_o(char *name, int val)
+{
+	int i;
+	const unsigned char *on;
+	size_t len;
+
+	if (name == NULL) {
+		if (val) {
+			/* "Pretty" output. */
+			out1str("Current option settings\n");
+			for (i = 0, on = optname; i < NOPTS; i++, on += *on + 1)
+				out1fmt("%-16.*s%s\n", *on, on + 1,
+					optval[i] ? "on" : "off");
+		} else {
+			/* Output suitable for re-input to shell. */
+			for (i = 0, on = optname; i < NOPTS; i++, on += *on + 1)
+				out1fmt("%s %co %.*s%s",
+				    i % 6 == 0 ? "set" : "",
+				    optval[i] ? '-' : '+',
+				    *on, on + 1,
+				    i % 6 == 5 || i == NOPTS - 1 ? "\n" : "");
+		}
+	} else {
+		len = strlen(name);
+		for (i = 0, on = optname; i < NOPTS; i++, on += *on + 1)
+			if (*on == len && memcmp(on + 1, name, len) == 0) {
+				setoptionbyindex(i, val);
+				return;
+			}
+		error("Illegal option -o %s", name);
+	}
+}
+
+
+static void
+setoptionbyindex(int idx, int val)
+{
+	if (&optval[idx] == &privileged && !val && privileged) {
+		if (setgid(getgid()) == -1)
+			error("setgid");
+		if (setuid(getuid()) == -1)
+			error("setuid");
+	}
+	optval[idx] = val;
+	if (val) {
+		/* #%$ hack for ksh semantics */
+		if (&optval[idx] == &Vflag)
+			Eflag = 0;
+		else if (&optval[idx] == &Eflag)
+			Vflag = 0;
+	}
+}
+
+static void
+setoption(int flag, int val)
+{
+	int i;
+
+	for (i = 0; i < NSHORTOPTS; i++)
+		if (optletter[i] == flag) {
+			setoptionbyindex(i, val);
+			return;
+		}
+	error("Illegal option -%c", flag);
+}
+
+
+/*
+ * Set the shell parameters.
+ */
+
+static void
+setparam(int argc, char **argv)
+{
+	char **newparam;
+	char **ap;
+
+	ap = newparam = ckmalloc((argc + 1) * sizeof *ap);
+	while (*argv) {
+		*ap++ = savestr(*argv++);
+	}
+	*ap = NULL;
+	freeparam(&shellparam);
+	shellparam.malloc = 1;
+	shellparam.nparam = argc;
+	shellparam.p = newparam;
+	shellparam.optp = NULL;
+	shellparam.reset = 1;
+	shellparam.optnext = NULL;
+}
+
+
+/*
+ * Free the list of positional parameters.
+ */
+
+void
+freeparam(struct shparam *param)
+{
+	char **ap;
+
+	if (param->malloc) {
+		for (ap = param->p ; *ap ; ap++)
+			ckfree(*ap);
+		ckfree(param->p);
+	}
+	if (param->optp) {
+		for (ap = param->optp ; *ap ; ap++)
+			ckfree(*ap);
+		ckfree(param->optp);
+	}
+}
+
+
+
+/*
+ * The shift builtin command.
+ */
+
+int
+shiftcmd(int argc, char **argv)
+{
+	int i, n;
+
+	n = 1;
+	if (argc > 1)
+		n = number(argv[1]);
+	if (n > shellparam.nparam)
+		return 1;
+	INTOFF;
+	shellparam.nparam -= n;
+	if (shellparam.malloc)
+		for (i = 0; i < n; i++)
+			ckfree(shellparam.p[i]);
+	memmove(shellparam.p, shellparam.p + n,
+	    (shellparam.nparam + 1) * sizeof(shellparam.p[0]));
+	shellparam.reset = 1;
+	INTON;
+	return 0;
+}
+
+
+
+/*
+ * The set builtin command.
+ */
+
+int
+setcmd(int argc, char **argv)
+{
+	if (argc == 1)
+		return showvarscmd(argc, argv);
+	INTOFF;
+	options(0);
+	optschanged();
+	if (*argptr != NULL) {
+		setparam(argc - (argptr - argv), argptr);
+	}
+	INTON;
+	return 0;
+}
+
+
+void
+getoptsreset(const char *value)
+{
+	while (*value == '0')
+		value++;
+	if (strcmp(value, "1") == 0)
+		shellparam.reset = 1;
+}
+
+/*
+ * The getopts builtin.  Shellparam.optnext points to the next argument
+ * to be processed.  Shellparam.optptr points to the next character to
+ * be processed in the current argument.  If shellparam.optnext is NULL,
+ * then it's the first time getopts has been called.
+ */
+
+int
+getoptscmd(int argc, char **argv)
+{
+	char **optbase = NULL, **ap;
+	int i;
+
+	if (argc < 3)
+		error("usage: getopts optstring var [arg]");
+
+	if (shellparam.reset == 1) {
+		INTOFF;
+		if (shellparam.optp) {
+			for (ap = shellparam.optp ; *ap ; ap++)
+				ckfree(*ap);
+			ckfree(shellparam.optp);
+			shellparam.optp = NULL;
+		}
+		if (argc > 3) {
+			shellparam.optp = ckmalloc((argc - 2) * sizeof *ap);
+			memset(shellparam.optp, '\0', (argc - 2) * sizeof *ap);
+			for (i = 0; i < argc - 3; i++)
+				shellparam.optp[i] = savestr(argv[i + 3]);
+		}
+		INTON;
+		optbase = argc == 3 ? shellparam.p : shellparam.optp;
+		shellparam.optnext = optbase;
+		shellparam.optptr = NULL;
+		shellparam.reset = 0;
+	} else
+		optbase = shellparam.optp ? shellparam.optp : shellparam.p;
+
+	return getopts(argv[1], argv[2], optbase, &shellparam.optnext,
+		       &shellparam.optptr);
+}
+
+static int
+getopts(char *optstr, char *optvar, char **optfirst, char ***optnext,
+    char **optptr)
+{
+	char *p, *q;
+	char c = '?';
+	int done = 0;
+	int ind = 0;
+	int err = 0;
+	char s[10];
+	const char *newoptarg = NULL;
+
+	if ((p = *optptr) == NULL || *p == '\0') {
+		/* Current word is done, advance */
+		if (*optnext == NULL)
+			return 1;
+		p = **optnext;
+		if (p == NULL || *p != '-' || *++p == '\0') {
+atend:
+			ind = *optnext - optfirst + 1;
+			*optnext = NULL;
+			p = NULL;
+			done = 1;
+			goto out;
+		}
+		(*optnext)++;
+		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
+			goto atend;
+	}
+
+	c = *p++;
+	for (q = optstr; *q != c; ) {
+		if (*q == '\0') {
+			if (optstr[0] == ':') {
+				s[0] = c;
+				s[1] = '\0';
+				newoptarg = s;
+			}
+			else
+				out2fmt_flush("Illegal option -%c\n", c);
+			c = '?';
+			goto out;
+		}
+		if (*++q == ':')
+			q++;
+	}
+
+	if (*++q == ':') {
+		if (*p == '\0' && (p = **optnext) == NULL) {
+			if (optstr[0] == ':') {
+				s[0] = c;
+				s[1] = '\0';
+				newoptarg = s;
+				c = ':';
+			}
+			else {
+				out2fmt_flush("No arg for -%c option\n", c);
+				c = '?';
+			}
+			goto out;
+		}
+
+		if (p == **optnext)
+			(*optnext)++;
+		newoptarg = p;
+		p = NULL;
+	}
+
+out:
+	if (*optnext != NULL)
+		ind = *optnext - optfirst + 1;
+	*optptr = p;
+	if (newoptarg != NULL)
+		err |= setvarsafe("OPTARG", newoptarg, 0);
+	else {
+		INTOFF;
+		err |= unsetvar("OPTARG");
+		INTON;
+	}
+	fmtstr(s, sizeof(s), "%d", ind);
+	err |= setvarsafe("OPTIND", s, VNOFUNC);
+	s[0] = c;
+	s[1] = '\0';
+	err |= setvarsafe(optvar, s, 0);
+	if (err) {
+		*optnext = NULL;
+		*optptr = NULL;
+		flushall();
+		exraise(EXERROR);
+	}
+	return done;
+}
+
+/*
+ * Standard option processing (a la getopt) for builtin routines.  The
+ * only argument that is passed to nextopt is the option string; the
+ * other arguments are unnecessary.  It returns the option, or '\0' on
+ * end of input.
+ */
+
+int
+nextopt(const char *optstring)
+{
+	char *p;
+	const char *q;
+	char c;
+
+	if ((p = nextopt_optptr) == NULL || *p == '\0') {
+		p = *argptr;
+		if (p == NULL || *p != '-' || *++p == '\0')
+			return '\0';
+		argptr++;
+		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
+			return '\0';
+	}
+	c = *p++;
+	for (q = optstring ; *q != c ; ) {
+		if (*q == '\0')
+			error("Illegal option -%c", c);
+		if (*++q == ':')
+			q++;
+	}
+	if (*++q == ':') {
+		if (*p == '\0' && (p = *argptr++) == NULL)
+			error("No arg for -%c option", c);
+		shoptarg = p;
+		p = NULL;
+	}
+	nextopt_optptr = p;
+	return c;
+}