getopt.c

/*
 * "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.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif							/* HAVE_CONFIG_H */

#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 */