Initial import

third_party/getopt/getopt.c

@@ -0,0 +1,145 @@
+asm(".ident\t\"\\n\\n\
+getopt (BSD-3)\\n\
+Copyright 1987, 1993, 1994 The Regents of the University of California\"");
+asm(".include \"libc/disclaimer.inc\"");
+
+/* clang-format off */
+/*	$NetBSD: getopt.c,v 1.26 2003/08/07 16:43:40 agc Exp $	*/
+
+/*
+ * Copyright (c) 1987, 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * 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.
+ *
+ * @(#)getopt.c	8.3 (Berkeley) 4/27/95
+ * $FreeBSD: src/lib/libc/stdlib/getopt.c,v 1.8 2007/01/09 00:28:10 imp Exp $
+ * $DragonFly: src/lib/libc/stdlib/getopt.c,v 1.7 2005/11/20 12:37:48 swildner Exp $
+ */
+
+#include "libc/str/str.h"
+#include "libc/runtime/runtime.h"
+#include "libc/stdio/stdio.h"
+
+int	opterr,			/* if error message should be printed */
+	optind,			/* index into parent argv vector */
+	optopt,			/* character checked for validity */
+	optreset;		/* reset getopt */
+char	*optarg;		/* argument associated with option */
+static char *place;		/* option letter processing */
+
+#define	BADCH	(int)'?'
+#define	BADARG	(int)':'
+
+static char EMSG[] = { '\0' };
+
+INITIALIZER(300, _init_getopt, {
+  opterr = 1;
+  optind = 1;
+  place = EMSG;
+});
+
+/*
+ * getopt --
+ *	Parse argc/argv argument vector.
+ */
+int
+getopt(int nargc, char * const nargv[], const char *ostr)
+{
+	char *oli;				/* option letter list index */
+
+	/*
+	 * Some programs like cvs expect optind = 0 to trigger
+	 * a reset of getopt.
+	 */
+	if (optind == 0)
+		optind = 1;
+
+	if (optreset || *place == 0) {		/* update scanning pointer */
+		optreset = 0;
+		place = nargv[optind];
+		if (optind >= nargc || *place++ != '-') {
+			/* Argument is absent or is not an option */
+			place = EMSG;
+			return (-1);
+		}
+		optopt = *place++;
+		if (optopt == '-' && *place == 0) {
+			/* "--" => end of options */
+			++optind;
+			place = EMSG;
+			return (-1);
+		}
+		if (optopt == 0) {
+			/* Solitary '-', treat as a '-' option
+			   if the program (eg su) is looking for it. */
+			place = EMSG;
+			if (strchr(ostr, '-') == NULL)
+				return (-1);
+			optopt = '-';
+		}
+	} else
+		optopt = *place++;
+
+	/* See if option letter is one the caller wanted... */
+	if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) {
+		if (*place == 0)
+			++optind;
+		if (opterr && *ostr != ':')
+			fprintf(stderr,
+			    "%s: illegal option -- %c\n", program_invocation_name,
+			    optopt);
+		return (BADCH);
+	}
+
+	/* Does this option need an argument? */
+	if (oli[1] != ':') {
+		/* don't need argument */
+		optarg = NULL;
+		if (*place == 0)
+			++optind;
+	} else {
+		/* Option-argument is either the rest of this argument or the
+		   entire next argument. */
+		if (*place)
+			optarg = place;
+		else if (nargc > ++optind)
+			optarg = nargv[optind];
+		else {
+			/* option-argument absent */
+			place = EMSG;
+			if (*ostr == ':')
+				return (BADARG);
+			if (opterr)
+				fprintf(stderr,
+				    "%s: option requires an argument -- %c\n",
+				    program_invocation_name, optopt);
+			return (BADCH);
+		}
+		place = EMSG;
+		++optind;
+	}
+	return (optopt);			/* return option letter */
+}