unstr.c revision 301178 
1/*-
2 * Copyright (c) 1991, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Ken Arnold.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#if 0
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1991, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41static const char sccsid[] = "@(#)unstr.c     8.1 (Berkeley) 5/31/93";
42#endif /* not lint */
43#endif
44#include <sys/cdefs.h>
45__FBSDID("$FreeBSD: stable/10/games/fortune/unstr/unstr.c 301178 2016-06-01 22:39:15Z truckman $");
46
47/*
48 *	This program un-does what "strfile" makes, thereby obtaining the
49 * original file again.  This can be invoked with the name of the output
50 * file, the input file, or both. If invoked with only a single argument
51 * ending in ".dat", it is pressumed to be the input file and the output
52 * file will be the same stripped of the ".dat".  If the single argument
53 * doesn't end in ".dat", then it is presumed to be the output file, and
54 * the input file is that name prepended by a ".dat".  If both are given
55 * they are treated literally as the input and output files.
56 *
57 *	Ken Arnold		Aug 13, 1978
58 */
59
60#include <sys/param.h>
61#include <sys/endian.h>
62#include <ctype.h>
63#include <err.h>
64#include <stdio.h>
65#include <stdlib.h>
66#include <string.h>
67
68#include "strfile.h"
69
70static char	*Infile,		/* name of input file */
71		Datafile[MAXPATHLEN],	/* name of data file */
72		Delimch;		/* delimiter character */
73
74static FILE	*Inf, *Dataf;
75
76static void order_unstr(STRFILE *);
77
78/* ARGSUSED */
79int
80main(int argc, char *argv[])
81{
82	static STRFILE tbl;		/* description table */
83
84	if (argc != 2) {
85		fprintf(stderr, "usage: unstr datafile\n");
86		exit(1);
87	}
88	Infile = argv[1];
89	if ((size_t)snprintf(Datafile, sizeof(Datafile), "%s.dat", Infile) >=
90	    sizeof(Datafile))
91		errx(1, "%s name too long", Infile);
92	if ((Inf = fopen(Infile, "r")) == NULL)
93		err(1, "%s", Infile);
94	if ((Dataf = fopen(Datafile, "r")) == NULL)
95		err(1, "%s", Datafile);
96	if (fread((char *)&tbl, sizeof(tbl), 1, Dataf) != 1) {
97		if (feof(Dataf))
98			errx(1, "%s read EOF", Datafile);
99		else
100			err(1, "%s read", Datafile);
101	}
102	tbl.str_version = be32toh(tbl.str_version);
103	tbl.str_numstr = be32toh(tbl.str_numstr);
104	tbl.str_longlen = be32toh(tbl.str_longlen);
105	tbl.str_shortlen = be32toh(tbl.str_shortlen);
106	tbl.str_flags = be32toh(tbl.str_flags);
107	if (!(tbl.str_flags & (STR_ORDERED | STR_RANDOM)))
108		errx(1, "nothing to do -- table in file order");
109	Delimch = tbl.str_delim;
110	order_unstr(&tbl);
111	fclose(Inf);
112	fclose(Dataf);
113	exit(0);
114}
115
116static void
117order_unstr(STRFILE *tbl)
118{
119	uint32_t i;
120	char *sp;
121	off_t pos;
122	char buf[BUFSIZ];
123
124	for (i = 0; i < tbl->str_numstr; i++) {
125		fread(&pos, 1, sizeof(pos), Dataf);
126		fseeko(Inf, be64toh(pos), SEEK_SET);
127		if (i != 0)
128			printf("%c\n", Delimch);
129		for (;;) {
130			sp = fgets(buf, sizeof(buf), Inf);
131			if (sp == NULL || STR_ENDSTRING(sp, *tbl))
132				break;
133			else
134				fputs(sp, stdout);
135		}
136	}
137}
138