From d1e8f91569f3024297a5a8129f5c6affe0d6dba6 Mon Sep 17 00:00:00 2001
From: OSQZSS <osqzss@gmail.com>
Date: Sat, 27 Jun 2015 10:16:23 +0900
Subject: [PATCH] Initial commit

---
 getopt.c | 110 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 getopt.h |   9 +++++
 2 files changed, 119 insertions(+)
 create mode 100644 getopt.c
 create mode 100644 getopt.h

diff --git a/getopt.c b/getopt.c
new file mode 100644
index 0000000..dab5fd8
--- /dev/null
+++ b/getopt.c
@@ -0,0 +1,110 @@
+/*
+* 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. 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.
+*/
+
+#include "getopt.h"
+#include <string.h>
+#include <stdio.h>
+ 
+int     opterr = 1,             /* if error message should be printed */
+        optind = 1,             /* index into parent argv vector */
+        optopt,                 /* character checked for validity */
+        optreset;               /* reset getopt */
+char    *optarg;                /* argument associated with option */
+ 
+#define BADCH   (int)'?'
+#define BADARG  (int)':'
+#define EMSG    ""
+ 
+/*
+ * getopt --
+ *      Parse argc/argv argument vector.
+ *
+ *      Note: Unlike GNU getopt(), after a non-option argument, all further 
+ *            arguments are considered also non-options. This is similar to 
+ *            the way non-GNU Unix systems work.
+ */
+int getopt(int nargc, char * const nargv[], const char *ostr)
+{
+  static char *place = EMSG;              /* option letter processing */
+  const char *oli;                              /* option letter list index */
+ 
+  if (optreset || !*place) {              /* update scanning pointer */
+    optreset = 0;
+    if (optind >= nargc || *(place = nargv[optind]) != '-') {
+      place = EMSG;
+      return (-1);
+    }
+    if (place[1] && *++place == '-') {      /* found "--" */
+      ++optind;
+      place = EMSG;
+      return (-1);
+    }
+  }                                       /* option letter okay? */
+  if ((optopt = (int)*place++) == (int)':' ||
+    !(oli = strchr(ostr, optopt))) {
+      /*
+      * if the user didn't specify '-' as an option,
+      * assume it means -1.
+      */
+      if (optopt == (int)'-')
+        return (-1);
+      if (!*place)
+        ++optind;
+      if (opterr && *ostr != ':')
+        (void)printf("illegal option -- %c\n", optopt);
+      return (BADCH);
+  }
+  if (*++oli != ':') {                    /* don't need argument */
+    optarg = NULL;
+    if (!*place)
+      ++optind;
+  }
+  else {                                  /* need an argument */
+    if (*place)                     /* no white space */
+      optarg = place;
+    else if (nargc <= ++optind) {   /* no arg */
+      place = EMSG;
+      if (*ostr == ':')
+        return (BADARG);
+      if (opterr)
+        (void)printf("option requires an argument -- %c\n", optopt);
+      return (BADCH);
+    }
+    else                            /* white space */
+      optarg = nargv[optind];
+    place = EMSG;
+    ++optind;
+  }
+  return (optopt);                        /* dump back option letter */
+}
+ 
\ No newline at end of file
diff --git a/getopt.h b/getopt.h
new file mode 100644
index 0000000..5978e22
--- /dev/null
+++ b/getopt.h
@@ -0,0 +1,9 @@
+#ifndef GETOPT_H
+#define GETOPT_H
+
+extern char *optarg;
+extern int optind;
+
+int getopt(int nargc, char * const nargv[], const char *ostr) ;
+
+#endif