getopt.c

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/*
**      @(#)getopt.c    2.5 (smail) 9/15/87
*/
 
#include "../postgis_config.h"
#include <stdio.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "getopt.h"
 
/*
 * 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 behavior of this getopt.
 * However, I am not about to post a copy of anything licensed by AT&T.
 */
 
#define ERR(s, c)\
  if(pgis_opterr){\
    fprintf(stderr, "%s%s%c\n", argv[0], s, c);\
  }
 
int     pgis_opterr = 1;
int     pgis_optind = 1;
int     pgis_optopt;
char    *pgis_optarg;
 
int
pgis_getopt(int argc, char **argv, char *opts)
{
        static int sp = 1;
        register int c;
        register char *cp;
 
        if (sp == 1)
        {
                if (pgis_optind >= argc ||
                        argv[pgis_optind][0] != '-' /* && argv[pgis_optind][0] != '/' */ ||
                        argv[pgis_optind][1] == '\0')
                {
                        return(EOF);
                }
                else if (strcmp(argv[pgis_optind], "--") == 0)
                {
                        pgis_optind++;
                        return(EOF);
                }
        }
        pgis_optopt = c = argv[pgis_optind][sp];
        if (c == ':' || (cp=strchr(opts, c)) == 0)
        {
                ERR(": illegal option -- ", c);
                if (argv[pgis_optind][++sp] == '\0')
                {
                        pgis_optind++;
                        sp = 1;
                }
                return('?');
        }
        if (*++cp == ':')
        {
                if (argv[pgis_optind][sp+1] != '\0')
                        pgis_optarg = &argv[pgis_optind++][sp+1];
                else if (++pgis_optind >= argc)
                {
                        ERR(": option requires an argument -- ", c);
                        sp = 1;
                        return('?');
                }
                else
                        pgis_optarg = argv[pgis_optind++];
                sp = 1;
        }
        else
        {
                if (argv[pgis_optind][++sp] == '\0')
                {
                        sp = 1;
                        pgis_optind++;
                }
                pgis_optarg = NULL;
        }
        return(c);
}