/*
* Copyright (c) 1984 through 2008, William LeFebvre
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
*     * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
*     * 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.
*
*     * Neither the name of William LeFebvre nor the names of other
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
* OWNER 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" routine customized for top.
*/

/*
* Many modern-day Unix implementations already have this function
* in libc.  The standard "getopt" is perfectly sufficient for top's
* needs.  If such a function exists in libc then you certainly don't
* need to compile this one in.  To prevent this function from being
* compiled, define "HAVE_GETOPT".  This is usually done in the "CFLAGS"
* line of the corresponding machine module.
*/

/*
* This empty declaration exists solely to placate overexhuberant C
* compilers that like to warn you about content-free files.
*/
static void __empty();

#ifndef HAVE_GETOPT

/*LINTLIBRARY*/

#include "os.h"
#ifndef NULL
#define NULL    0
#endif
#ifndef EOF
#define EOF     (-1)
#endif
#define ERR(s, c)       if(opterr){\
       extern int write();\
       char errbuf[2];\
       errbuf[0] = c; errbuf[1] = '\n';\
       (void) write(2, argv[0], strlen(argv[0]));\
       (void) write(2, s, strlen(s));\
       (void) write(2, errbuf, 2);}


int     opterr = 1;
int     optind = 1;
int     optopt;
char    *optarg;

int
getopt(int argc, char **argv, 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(": unknown 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(": argument missing for -", c);
                       sp = 1;
                       return('?');
               } else
                       optarg = argv[optind++];
               sp = 1;
       } else {
               if(argv[optind][++sp] == '\0') {
                       sp = 1;
                       optind++;
               }
               optarg = NULL;
       }
       return(c);
}
#endif /* HAVE_GETOPT */