windows-xp/Source/XPSP1/NT/base/subsys/posix/programs/pax/getopt.c

/*
	getopt.c

	modified public-domain AT&T getopt(3)
*/

#include <stdio.h>
#include <string.h>

#ifdef _POSIX_SOURCE
#	include <unistd.h>
#else
#	define STDERR_FILENO 2
#	ifdef __STDC__
		extern int write (int fildes, char * buf, unsigned nbyte);
#	else
		extern int write ();
#	endif
#endif

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

#ifdef __STDC__
	static void ERR (char ** argv, char * s, char c)
#else
	static void ERR (argv, s, c)
	char ** argv, * s, c;
#endif
{
	char errbuf[2];

#ifdef DF_TRACE_DEBUG
printf("DF_TRACE_DEBUG: 	static void ERR () in getopt.c\n");
#endif
	if (opterr)
	{
		errbuf[0] = c;
		errbuf[1] = '\n';
		(void) write(STDERR_FILENO,argv[0],strlen(argv[0]));
		(void) write(STDERR_FILENO,s,strlen(s));
		(void) write(STDERR_FILENO,errbuf,sizeof errbuf);
	}
}

#ifdef __STDC__
	int getopt (int argc, char ** argv, char * opts)
#else
	int getopt (argc, argv, opts)
	int argc;
	char ** argv, * opts;
#endif
{
	static int sp = 1, error = (int) '?';
	static char sw = '-', eos = '\0', arg = ':';
	register char c, * cp;

#ifdef DF_TRACE_DEBUG
printf("DF_TRACE_DEBUG: 	int getopt () in getopt.c\n");
#endif
	if (sp == 1)
		if (optind >= argc || argv[optind][0] != sw
		|| argv[optind][1] == eos)
			return EOF;
		else if (strcmp(argv[optind],"--") == 0)
		{
			optind++;
			return EOF;
		}
	c = argv[optind][sp];
	optopt = (int) c;
	if (c == arg || (cp = strchr(opts,c)) == NULL)
	{
		ERR(argv,": illegal option--",c);
		if (argv[optind][++sp] == eos)
		{
			optind++;
			sp = 1;
		}
		return error;
	}
	else if (*++cp == arg)
	{
		if (argv[optind][sp + 1] != eos)
			optarg = &argv[optind++][sp + 1];
		else if (++optind >= argc)
		{
			ERR(argv,": option requires an argument--",c);
			sp = 1;
			return error;
		}
		else
			optarg = argv[optind++];
		sp = 1;
	}
	else
	{
		if (argv[optind][++sp] == eos)
		{
			sp = 1;
			optind++;
		}
		optarg = NULL;
	}
	return (int) c;
}