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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: cap_mkdb.c,v 1.16 2009/10/27 23:59:36 deraadt Exp $	*/
/*	$NetBSD: cap_mkdb.c,v 1.5 1995/09/02 05:47:12 jtc Exp $	*/

/*-
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/stat.h>

#include <db.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>

void	 db_build(char **);
void	 dounlink(void);
void	 usage(void);
int	 igetnext(char **, char **);
int	 main(int, char *[]);

DB *capdbp;
int info, verbose;
char *capname, buf[8 * 1024];

HASHINFO openinfo = {
	4096,		/* bsize */
	16,		/* ffactor */
	256,		/* nelem */
	2048 * 1024,	/* cachesize */
	NULL,		/* hash() */
	0		/* lorder */
};

/*
 * cap_mkdb creates a capability hash database for quick retrieval of capability
 * records.  The database contains 2 types of entries: records and references
 * marked by the first byte in the data.  A record entry contains the actual
 * capability record whereas a reference contains the name (key) under which
 * the correct record is stored.
 */
int
main(int argc, char *argv[])
{
	int c;

	capname = NULL;
	while ((c = getopt(argc, argv, "f:iv")) != -1) {
		switch(c) {
		case 'f':
			capname = optarg;
			break;
		case 'v':
			verbose = 1;
			break;
		case 'i':
			info = 1;
			break;
		case '?':
		default:
			usage();
		}
	}
	argc -= optind;
	argv += optind;

	if (*argv == NULL)
		usage();

	/*
	 * The database file is the first argument if no name is specified.
	 * Make arrangements to unlink it if we exit badly.
	 */
	(void)snprintf(buf, sizeof(buf), "%s.db", capname ? capname : *argv);
	if ((capname = strdup(buf)) == NULL)
		err(1, NULL);
	if ((capdbp = dbopen(capname, O_CREAT | O_TRUNC | O_RDWR,
	    DEFFILEMODE, DB_HASH, &openinfo)) == NULL)
		err(1, "%s", buf);

	if (atexit(dounlink))
		err(1, "atexit");

	db_build(argv);

	if (capdbp->close(capdbp) < 0)
		err(1, "%s", capname);
	capname = NULL;
	exit(0);
}

void
dounlink(void)
{
	if (capname != NULL)
		(void)unlink(capname);
}

/*
 * Any changes to these definitions should be made also in the getcap(3)
 * library routines.
 */
#define RECOK	(char)0
#define TCERR	(char)1
#define SHADOW	(char)2

/*
 * db_build() builds the name and capability databases according to the
 * details above.
 */
void
db_build(char **ifiles)
{
	DBT key, data;
	recno_t reccnt;
	size_t len, bplen;
	int st;
	char *bp, *p, *t, *out, ch;

	cgetusedb(0);		/* disable reading of .db files in getcap(3) */

	data.data = NULL;
	key.data = NULL;
	for (reccnt = 0, bplen = 0;
	     (st = (info ? igetnext(&bp, ifiles) : cgetnext(&bp, ifiles))) > 0;) {

		/*
		 * Allocate enough memory to store four times the size of the
		 * record (so an existing ':' can be expanded to '\072' for
		 * terminfo) plus a terminating NULL and one extra byte.
		 */
		len = strlen(bp);
		if (bplen <= 4 * len + 2) {
			int newbplen = bplen + MAX(256, 4 * len + 2);
			void *newdata;

			if ((newdata = realloc(data.data, newbplen)) == NULL)
				err(1, NULL);
			data.data = newdata;
			bplen = newbplen;
		}

		/* Find the end of the name field. */
		if ((p = strchr(bp, info ? ',' : ':')) == NULL) {
			warnx("no name field: %.*s", (int)MIN(len, 20), bp);
			continue;
		}

		/* First byte of stored record indicates status. */
		switch(st) {
		case 1:
			((char *)(data.data))[0] = RECOK;
			break;
		case 2:
			((char *)(data.data))[0] = TCERR;
			warnx("Record not tc expanded: %.*s", (int)(p - bp), bp);
			break;
		}

		/* Create the stored record. */
		if (info) {
			/*
			 * The record separator is :, so it is necessary to
			 * change commas into colons. However, \, should be
			 * left alone, unless the \ is the last part of ^\.
			 */
			data.size = len + 2;
			out = ((char *) data.data) + 1;
			t = bp;
			while (t < bp + len) {
				switch (ch = *t++) {
				case '^':
				case '\\':
					*out++ = ch;
					if (*t != '\0')
						*out++ = *t++;
					break;
				case ':':
					memcpy(out, "\\072", 4);
					out += 4;
					data.size += 3; /* : already counted */
					break;
				case ',':
					*out++ = ':';
					break;
				default:
					*out++ = ch;
					break;
				}
			}
			*out++ = '\0';
			if (memchr((char *)data.data + 1, '\0', data.size - 2)) {
				warnx("NUL in entry: %.*s", (int)MIN(len, 20), bp);
				continue;
			}
		} else {
			char *capbeg, *capend;

			t = (char *)data.data + 1;
			/* Copy the cap name and trailing ':' */
			len = p - bp + 1;
			memcpy(t, bp, len);
			t += len;

			/* Copy entry, collapsing empty fields. */
			capbeg = p + 1;
			while (*capbeg) {
				/* Skip empty fields. */
				if ((len = strspn(capbeg, ": \t\n\r")))
					capbeg += len;

				/* Find the end of this cap and copy it w/ : */
				capend = strchr(capbeg, ':');
				if (capend)
					len = capend - capbeg + 1;
				else
					len = strlen(capbeg);
				memcpy(t, capbeg, len);
				t += len;
				capbeg += len;
			}
			*t = '\0';
			data.size = t - (char *)data.data + 1;
		}

		/* Store the record under the name field. */
		key.data = bp;
		key.size = p - bp;

		switch(capdbp->put(capdbp, &key, &data, R_NOOVERWRITE)) {
		case -1:
			err(1, "put");
			/* NOTREACHED */
		case 1:
			warnx("ignored duplicate: %.*s",
			    (int)key.size, (char *)key.data);
			continue;
		}
		++reccnt;

		/* If only one name, ignore the rest. */
		if ((p = strchr(bp, '|')) == NULL)
			continue;

		/* The rest of the names reference the entire name. */
		((char *)(data.data))[0] = SHADOW;
		(void) memmove(&((u_char *)(data.data))[1], key.data, key.size);
		data.size = key.size + 1;

		/* Store references for other names. */
		for (p = t = bp;; ++p) {
			if (p > t && (*p == (info ? ',' : ':') || *p == '|')) {
				key.size = p - t;
				key.data = t;
				switch(capdbp->put(capdbp,
				    &key, &data, R_NOOVERWRITE)) {
				case -1:
					err(1, "put");
					/* NOTREACHED */
				case 1:
					warnx("ignored duplicate: %.*s",
					      (int)key.size, (char *)key.data);
				}
				t = p + 1;
			}
			if (*p == (info ? ',' : ':'))
				break;
		}
		free(bp);
	}

	switch(st) {
	case -1:
		err(1, "file argument");
		/* NOTREACHED */
	case -2:
		errx(1, "potential reference loop detected");
		/* NOTREACHED */
	}

	if (verbose)
		(void)printf("cap_mkdb: %d capability records\n", reccnt);
}

void
usage(void)
{
	(void)fprintf(stderr,
	    "usage: cap_mkdb [-iv] [-f outfile] file1 [file2 ...]\n");
	exit(1);
}