getopt functionality for win32 console apps

	(based on appl/telnet/libtelnet/getopt.c)

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@9845 dc483132-0cff-0310-8789-dd5450dbe970

diff --git a/src/util/windows/getopt.c b/src/util/windows/getopt.c
new file mode 100644 (file)
index 0000000..ee38e72
--- /dev/null
+++ b/src/util/windows/getopt.c
@@ -0,0 +1,126 @@
+/*
+ * Copyright (c) 1987, 1993
+ *     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.
+ */
+
+/* based on @(#)getopt.c       8.1 (Berkeley) 6/4/93 */
+
+#ifndef __STDC__
+#define const
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+/*
+ * get option letter from argument vector
+ */
+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    ""
+
+int
+getopt(nargc, nargv, ostr)
+       int nargc;
+       char * const *nargv;
+       const char *ostr;
+{
+       static char *place = EMSG;              /* option letter processing */
+       register char *oli;                     /* option letter list index */
+       char *p;
+
+       if (optreset || !*place) {              /* update scanning pointer */
+               optreset = 0;
+               if (optind >= nargc || *(place = nargv[optind]) != '-') {
+                       place = EMSG;
+                       return(EOF);
+               }
+               if (place[1] && *++place == '-') {      /* found "--" */
+                       ++optind;
+                       place = EMSG;
+                       return(EOF);
+               }
+       }                                       /* option letter okay? */
+       if ((optopt = (int)*place++) == (int)':' ||
+           !(oli = strchr(ostr, optopt))) {
+               /*
+                * if the user didn't specify '-' as an option,
+                * assume it means EOF.
+                */
+               if (optopt == (int)'-')
+                       return(EOF);
+               if (!*place)
+                       ++optind;
+               if (opterr && *ostr != ':') {
+                       if (!(p = strrchr(*nargv, '/')))
+                               p = *nargv;
+                       else
+                               ++p;
+                       (void)fprintf(stderr, "%s: illegal option -- %c\n",
+                           p, 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 (!(p = strrchr(*nargv, '/')))
+                               p = *nargv;
+                       else
+                               ++p;
+                       if (*ostr == ':')
+                               return(BADARG);
+                       if (opterr)
+                               (void)fprintf(stderr,
+                                   "%s: option requires an argument -- %c\n",
+                                   p, optopt);
+                       return(BADCH);
+               }
+               else                            /* white space */
+                       optarg = nargv[optind];
+               place = EMSG;
+               ++optind;
+       }
+       return(optopt);                         /* dump back option letter */
+}