Initial Contribution
diff --git a/sh/options.c b/sh/options.c
new file mode 100644
index 0000000..bc833c7
--- /dev/null
+++ b/sh/options.c
@@ -0,0 +1,530 @@
+/* $NetBSD: options.c,v 1.37 2004/10/30 19:29:27 christos 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.
+ */
+
+#include <sys/cdefs.h>
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)options.c 8.2 (Berkeley) 5/4/95";
+#else
+__RCSID("$NetBSD: options.c,v 1.37 2004/10/30 19:29:27 christos Exp $");
+#endif
+#endif /* not lint */
+
+#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"
+#ifndef SMALL
+#include "myhistedit.h"
+#endif
+#include "show.h"
+
+char *arg0; /* value of $0 */
+struct shparam shellparam; /* current positional parameters */
+char **argptr; /* argument list for builtin commands */
+char *optionarg; /* set by nextopt (like getopt) */
+char *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 int getopts(char *, char *, char **, char ***, char **);
+
+
+/*
+ * Process the shell command line arguments.
+ */
+
+void
+procargs(int argc, char **argv)
+{
+ int i;
+
+ argptr = argv;
+ if (argc > 0)
+ argptr++;
+ for (i = 0; i < NOPTS; i++)
+ optlist[i].val = 2;
+ options(1);
+ if (*argptr == NULL && minusc == NULL)
+ sflag = 1;
+ if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
+ iflag = 1;
+ if (mflag == 2)
+ mflag = iflag;
+ for (i = 0; i < NOPTS; i++)
+ if (optlist[i].val == 2)
+ optlist[i].val = 0;
+#if DEBUG == 2
+ debug = 1;
+#endif
+ arg0 = argv[0];
+ if (sflag == 0 && minusc == NULL) {
+ commandname = argv[0];
+ arg0 = *argptr++;
+ setinputfile(arg0, 0);
+ commandname = arg0;
+ }
+ /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
+ if (minusc != NULL) {
+ if (argptr == NULL || *argptr == NULL)
+ error("Bad -c option");
+ minusc = *argptr++;
+ if (*argptr != 0)
+ 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(iflag);
+#ifdef WITH_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.
+ */
+
+STATIC void
+options(int cmdline)
+{
+ static char empty[] = "";
+ char *p;
+ int val;
+ int c;
+
+ if (cmdline)
+ minusc = NULL;
+ while ((p = *argptr) != NULL) {
+ argptr++;
+ if ((c = *p++) == '-') {
+ val = 1;
+ if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) {
+ if (!cmdline) {
+ /* "-" means turn off -x and -v */
+ if (p[0] == '\0')
+ xflag = vflag = 0;
+ /* "--" means reset params */
+ else if (*argptr == NULL)
+ setparam(argptr);
+ }
+ break; /* "-" or "--" terminates options */
+ }
+ } else if (c == '+') {
+ val = 0;
+ } else {
+ argptr--;
+ break;
+ }
+ while ((c = *p++) != '\0') {
+ if (c == 'c' && cmdline) {
+ /* command is after shell args*/
+ minusc = empty;
+ } else if (c == 'o') {
+ minus_o(*argptr, val);
+ if (*argptr)
+ argptr++;
+ } else {
+ setoption(c, val);
+ }
+ }
+ }
+}
+
+static void
+set_opt_val(int i, int val)
+{
+ int j;
+ int flag;
+
+ if (val && (flag = optlist[i].opt_set)) {
+ /* some options (eg vi/emacs) are mutually exclusive */
+ for (j = 0; j < NOPTS; j++)
+ if (optlist[j].opt_set == flag)
+ optlist[j].val = 0;
+ }
+ optlist[i].val = val;
+#ifdef DEBUG
+ if (&optlist[i].val == &debug)
+ opentrace();
+#endif
+}
+
+STATIC void
+minus_o(char *name, int val)
+{
+ int i;
+
+ if (name == NULL) {
+ out1str("Current option settings\n");
+ for (i = 0; i < NOPTS; i++)
+ out1fmt("%-16s%s\n", optlist[i].name,
+ optlist[i].val ? "on" : "off");
+ } else {
+ for (i = 0; i < NOPTS; i++)
+ if (equal(name, optlist[i].name)) {
+ set_opt_val(i, val);
+ return;
+ }
+ error("Illegal option -o %s", name);
+ }
+}
+
+
+STATIC void
+setoption(int flag, int val)
+{
+ int i;
+
+ for (i = 0; i < NOPTS; i++)
+ if (optlist[i].letter == flag) {
+ set_opt_val( i, val );
+ return;
+ }
+ error("Illegal option -%c", flag);
+ /* NOTREACHED */
+}
+
+
+
+#ifdef mkinit
+INCLUDE "options.h"
+
+SHELLPROC {
+ int i;
+
+ for (i = 0; optlist[i].name; i++)
+ optlist[i].val = 0;
+ optschanged();
+
+}
+#endif
+
+
+/*
+ * Set the shell parameters.
+ */
+
+void
+setparam(char **argv)
+{
+ char **newparam;
+ char **ap;
+ int nparam;
+
+ for (nparam = 0 ; argv[nparam] ; nparam++);
+ ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
+ while (*argv) {
+ *ap++ = savestr(*argv++);
+ }
+ *ap = NULL;
+ freeparam(&shellparam);
+ shellparam.malloc = 1;
+ shellparam.nparam = nparam;
+ shellparam.p = newparam;
+ shellparam.optnext = NULL;
+}
+
+
+/*
+ * Free the list of positional parameters.
+ */
+
+void
+freeparam(volatile struct shparam *param)
+{
+ char **ap;
+
+ if (param->malloc) {
+ for (ap = param->p ; *ap ; ap++)
+ ckfree(*ap);
+ ckfree(param->p);
+ }
+}
+
+
+
+/*
+ * The shift builtin command.
+ */
+
+int
+shiftcmd(int argc, char **argv)
+{
+ int n;
+ char **ap1, **ap2;
+
+ n = 1;
+ if (argc > 1)
+ n = number(argv[1]);
+ if (n > shellparam.nparam)
+ error("can't shift that many");
+ INTOFF;
+ shellparam.nparam -= n;
+ for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
+ if (shellparam.malloc)
+ ckfree(*ap1);
+ }
+ ap2 = shellparam.p;
+ while ((*ap2++ = *ap1++) != NULL);
+ shellparam.optnext = NULL;
+ INTON;
+ return 0;
+}
+
+
+
+/*
+ * The set command builtin.
+ */
+
+int
+setcmd(int argc, char **argv)
+{
+ if (argc == 1)
+ return showvars(0, 0, 1);
+ INTOFF;
+ options(0);
+ optschanged();
+ if (*argptr != NULL) {
+ setparam(argptr);
+ }
+ INTON;
+ return 0;
+}
+
+
+void
+getoptsreset(value)
+ const char *value;
+{
+ if (number(value) == 1) {
+ shellparam.optnext = NULL;
+ 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;
+
+ if (argc < 3)
+ error("usage: getopts optstring var [arg]");
+ else if (argc == 3)
+ optbase = shellparam.p;
+ else
+ optbase = &argv[3];
+
+ if (shellparam.reset == 1) {
+ shellparam.optnext = optbase;
+ shellparam.optptr = NULL;
+ shellparam.reset = 0;
+ }
+
+ return getopts(argv[1], argv[2], optbase, &shellparam.optnext,
+ &shellparam.optptr);
+}
+
+STATIC int
+getopts(char *optstr, char *optvar, char **optfirst, char ***optnext, char **optpptr)
+{
+ char *p, *q;
+ char c = '?';
+ int done = 0;
+ int ind = 0;
+ int err = 0;
+ char s[12];
+
+ if ((p = *optpptr) == 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';
+ err |= setvarsafe("OPTARG", s, 0);
+ } else {
+ outfmt(&errout, "Illegal option -%c\n", c);
+ (void) unsetvar("OPTARG", 0);
+ }
+ c = '?';
+ goto bad;
+ }
+ if (*++q == ':')
+ q++;
+ }
+
+ if (*++q == ':') {
+ if (*p == '\0' && (p = **optnext) == NULL) {
+ if (optstr[0] == ':') {
+ s[0] = c;
+ s[1] = '\0';
+ err |= setvarsafe("OPTARG", s, 0);
+ c = ':';
+ } else {
+ outfmt(&errout, "No arg for -%c option\n", c);
+ (void) unsetvar("OPTARG", 0);
+ c = '?';
+ }
+ goto bad;
+ }
+
+ if (p == **optnext)
+ (*optnext)++;
+ err |= setvarsafe("OPTARG", p, 0);
+ p = NULL;
+ } else
+ err |= setvarsafe("OPTARG", "", 0);
+ ind = *optnext - optfirst + 1;
+ goto out;
+
+bad:
+ ind = 1;
+ *optnext = NULL;
+ p = NULL;
+out:
+ *optpptr = p;
+ 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;
+ *optpptr = NULL;
+ flushall();
+ exraise(EXERROR);
+ }
+ return done;
+}
+
+/*
+ * XXX - should get rid of. have all builtins use getopt(3). the
+ * library getopt must have the BSD extension static variable "optreset"
+ * otherwise it can't be used within the shell safely.
+ *
+ * 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 return the character, or '\0' on
+ * end of input.
+ */
+
+int
+nextopt(const char *optstring)
+{
+ char *p;
+ const char *q;
+ char c;
+
+ if ((p = 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);
+ optionarg = p;
+ p = NULL;
+ }
+ optptr = p;
+ return c;
+}