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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: getcap.c,v 1.3 2009/10/27 23:59:38 deraadt Exp $	*/

/*
 * Copyright (c) 2005 Todd C. Miller <Todd.Miller@courtesan.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

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

enum captype {
	boolean,
	number,
	string,
	raw
};

void lookup_cap(char *, char *, enum captype, int);
__dead void usage(void);

int
main(int argc, char *argv[])
{
	int ch, aflag;
	enum captype type;
	char *cp, *buf, *cap = NULL, **pathvec = NULL;
	size_t n;

	aflag = type = 0;
	while ((ch = getopt(argc, argv, "ab:c:f:n:s:")) != -1) {
		switch (ch) {
		case 'a':
			aflag = 1;
			break;
		case 'b':
			if (*optarg == '\0')
				usage();
			cap = optarg;
			type = boolean;
			break;
		case 'n':
			if (*optarg == '\0')
				usage();
			cap = optarg;
			type = number;
			break;
		case 's':
			if (*optarg == '\0')
				usage();
			cap = optarg;
			type = string;
			break;
		case 'c':
			if (*optarg == '\0')
				usage();
			cap = optarg;
			type = raw;
			break;
		case 'f':
			if (pathvec != NULL)
				errx(1, "only one -f option may be specified");
			for (n = 1, cp = optarg; (cp = strchr(cp, ':')); n++)
				continue;
			pathvec = calloc(n + 1, sizeof(char *));
			for (n = 0; (pathvec[n] = strsep(&optarg, ":"));) {
				if (*pathvec[n] != '\0')
					n++;
			}
			break;
		default:
			usage();
		}
	}
	argc -= optind;
	argv += optind;

	if (pathvec == NULL) {
		warnx("no path specified");
		usage();
	}
	if (!aflag && !argc) {
		warnx("must specify -a or a record name");
		usage();
	}

	if (aflag) {
		while (cgetnext(&buf, pathvec) > 0) {
			lookup_cap(buf, cap, type, 1);
			free(buf);
		}
	} else {
		while (*argv != NULL) {
		    if (cgetent(&buf, pathvec, *argv) != 0)
			    errx(1, "unable to lookup %s", *argv); /* XXX */
		    lookup_cap(buf, cap, type, argc > 1);
		    free(buf);
		    argv++;
		}
	}
	exit(0);
}

void
lookup_cap(char *buf, char *cap, enum captype type, int useprefix)
{
	char *cp, *endp;
	long l;
	int ch, n, prefixlen;

	if (cap == NULL) {
		puts(buf);
		return;
	}

	prefixlen = useprefix ? strcspn(buf, "|:") : 0;

	switch (type) {
	case boolean:
		if (cgetcap(buf, cap, ':') == NULL)
			return;
		printf("%.*s%s%s\n", prefixlen, buf,
		    useprefix ? ": " : "", cap);
		break;
	case number:
		if (cgetnum(buf, cap, &l) == -1)
			return;
		printf("%.*s%s%ld\n", prefixlen, buf,
		    useprefix ? ": " : "", l);
		break;
	case string:
		if ((n = cgetstr(buf, cap, &cp)) == -1)
			return;
		else if (n == -2)
			err(1, NULL);	/* ENOMEM */
		printf("%.*s%s%s\n", prefixlen, buf,
		    useprefix ? ": " : "", cp);
		break;
	case raw:
		n = strlen(cap) - 1;
		ch = cap[n];
		cap[n] = '\0';
		cp = cgetcap(buf, cap, ch);
		cap[n] = ch;
		if (cp != NULL) {
			if ((endp = strchr(cp, ':')) != NULL)
				printf("%.*s%s%.*s\n", prefixlen, buf,
				    useprefix ? ": " : "", endp - cp, cp);
			else
				printf("%.*s%s%s\n", prefixlen, buf,
				    useprefix ? ": " : "", cp);
		}
		break;
	}
}

__dead void
usage(void)
{
	extern char *__progname;

	fprintf(stderr, "usage: %s [-b boolean | -c capability | -n number | -s string] -a -f path\n"
	    "       %s [-b boolean | -c capability | -n number | -s string] -f path record ...\n",
	    __progname, __progname);
	exit(1);
}