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WebSVN – planix.SVN – Blame – /os/branches/feature_unix/sys/src/cmd/postscript/common/getopt.c – Rev 2

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#ifndef _POSIX_SOURCE
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#include <u.h>
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#include <libc.h>
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#else
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#define _BSD_EXTENSION
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#endif
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#include	<stdio.h>
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#define ERR(str, chr)       if(opterr){fprintf(stderr, "%s%s%c\n", argv[0], str, chr);}
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int     opterr = 1;
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int     optind = 1;
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int	optopt;
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char    *optarg;
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int
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getopt (argc, argv, opts)
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char **argv, *opts;
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{
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	static int sp = 1;
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	register c;
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	register char *cp;
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	if (sp == 1)
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		if (optind >= argc ||
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		   argv[optind][0] != '-' || argv[optind][1] == '\0')
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			return EOF;
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		else if (strcmp(argv[optind], "--") == 0) {
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			optind++;
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			return EOF;
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		}
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	optopt = c = argv[optind][sp];
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	if (c == ':' || (cp=strchr(opts, c)) == NULL) {
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		ERR (": illegal option -- ", c);
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		if (argv[optind][++sp] == '\0') {
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			optind++;
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			sp = 1;
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		}
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		return '?';
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	}
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	if (*++cp == ':') {
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		if (argv[optind][sp+1] != '\0')
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			optarg = &argv[optind++][sp+1];
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		else if (++optind >= argc) {
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			ERR (": option requires an argument -- ", c);
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			sp = 1;
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			return '?';
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		} else
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			optarg = argv[optind++];
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		sp = 1;
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	} else {
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		if (argv[optind][++sp] == '\0') {
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			sp = 1;
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			optind++;
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		}
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		optarg = NULL;
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	}
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	return c;
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}