Add getopt 1.5 3rd party dependency

src/os/src/snippets/code/os_stdlib_getopt.c

@@ -0,0 +1,90 @@
+/*
+ * Copyright(c) 2006 to 2018 ADLINK Technology Limited and others
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0, or the Eclipse Distribution License
+ * v. 1.0 which is available at
+ * http://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
+ */
+/* ::[[ @(#) getopt.c 1.5 89/03/11 05:40:23 ]]:: */
+#ifndef LINT
+static const char Id[] = "$Id: os_stdlib_getopt.c,v 1.2 2008-11-17 09:53:45 hansv Exp $";
+#endif
+
+/*
+ * Here's something you've all been waiting for:  the AT&T public domain
+ * source for getopt(3).  It is the code which was given out at the 1985
+ * UNIFORUM conference in Dallas.  I obtained it by electronic mail
+ * directly from AT&T.  The people there assure me that it is indeed
+ * in the public domain.
+ *
+ * There is no manual page.  That is because the one they gave out at
+ * UNIFORUM was slightly different from the current System V Release 2
+ * manual page.  The difference apparently involved a note about the
+ * famous rules 5 and 6, recommending using white space between an option
+ * and its first argument, and not grouping options that have arguments.
+ * Getopt itself is currently lenient about both of these things White
+ * space is allowed, but not mandatory, and the last option in a group can
+ * have an argument.  That particular version of the man page evidently
+ * has no official existence, and my source at AT&T did not send a copy.
+ * The current SVR2 man page reflects the actual behavor of this getopt.
+ * However, I am not about to post a copy of anything licensed by AT&T.
+ */
+
+#define ERR(szz,czz) if(opterr){fprintf(stderr,"%s%s%c\n",argv[0],szz,czz);}
+
+int opterr = 1;
+int optind = 1;
+int optopt;
+char *optarg;
+
+int
+getopt(
+    int argc,
+    char **argv,
+    const char *opts)
+{
+    static int sp = 1;
+    register int c;
+    register char *cp;
+
+    if (sp == 1) {
+	if (optind >= argc ||
+	    argv[optind][0] != '-' || argv[optind][1] == '\0')
+	    return (EOF);
+	else if (strcmp(argv[optind], "--") == 0) {
+	    optind++;
+	    return (EOF);
+	}
+    }
+    optopt = c = argv[optind][sp];
+    if (c == ':' || (cp = strchr(opts, c)) == NULL) {
+	ERR(": illegal option -- ", c);
+	if (argv[optind][++sp] == '\0') {
+	    optind++;
+	    sp = 1;
+	}
+	return ('?');
+    }
+    if (*++cp == ':') {
+	if (argv[optind][sp + 1] != '\0')
+	    optarg = &argv[optind++][sp + 1];
+	else if (++optind >= argc) {
+	    ERR(": option requires an argument -- ", c);
+	    sp = 1;
+	    return ('?');
+	} else
+	    optarg = argv[optind++];
+	sp = 1;
+    } else {
+	if (argv[optind][++sp] == '\0') {
+	    sp = 1;
+	    optind++;
+	}
+	optarg = NULL;
+    }
+    return (c);
+}