usr.bin/unstr/unstr.c

   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  * @(#) Copyright (c) 1991, 1993 The Regents of the University of California.  All rights reserved.
  33  * @(#)unstr.c     8.1 (Berkeley) 5/31/93
  34  * $FreeBSD: head/usr.bin/fortune/unstr/unstr.c 300705 2016-05-26 01:33:24Z truckman $
  35  */
  36
  37 /*
  38  *      This program un-does what "strfile" makes, thereby obtaining the
  39  * original file again.  This can be invoked with the name of the output
  40  * file, the input file, or both. If invoked with only a single argument
  41  * ending in ".dat", it is pressumed to be the input file and the output
  42  * file will be the same stripped of the ".dat".  If the single argument
  43  * doesn't end in ".dat", then it is presumed to be the output file, and
  44  * the input file is that name prepended by a ".dat".  If both are given
  45  * they are treated literally as the input and output files.
  46  *
  47  *      Ken Arnold              Aug 13, 1978
  48  */
  49
  50 #include <sys/param.h>
  51 #include <sys/endian.h>
  52 #include <ctype.h>
  53 #include <err.h>
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <string.h>
  57
  58 #include "strfile.h"
  59
  60 static char     *Infile;                /* name of input file */
  61 static char     Datafile[MAXPATHLEN];   /* name of data file */
  62 static char     Delimch;                /* delimiter character */
  63
  64 static FILE     *Inf, *Dataf;
  65
  66 static void order_unstr(STRFILE *);
  67
  68 /* ARGSUSED */
  69 int
  70 main(int argc, char *argv[])
  71 {
  72         static STRFILE tbl;             /* description table */
  73
  74         if (argc != 2) {
  75                 fprintf(stderr, "usage: unstr datafile\n");
  76                 exit(1);
  77         }
  78         Infile = argv[1];
  79         if ((size_t)snprintf(Datafile, sizeof(Datafile), "%s.dat", Infile) >=
  80             sizeof(Datafile))
  81                 errx(1, "%s name too long", Infile);
  82         if ((Inf = fopen(Infile, "r")) == NULL)
  83                 err(1, "%s", Infile);
  84         if ((Dataf = fopen(Datafile, "r")) == NULL)
  85                 err(1, "%s", Datafile);
  86         if (fread((char *)&tbl, sizeof(tbl), 1, Dataf) != 1) {
  87                 if (feof(Dataf))
  88                         errx(1, "%s read EOF", Datafile);
  89                 else
  90                         err(1, "%s read", Datafile);
  91         }
  92         tbl.str_version = be32toh(tbl.str_version);
  93         tbl.str_numstr = be32toh(tbl.str_numstr);
  94         tbl.str_longlen = be32toh(tbl.str_longlen);
  95         tbl.str_shortlen = be32toh(tbl.str_shortlen);
  96         tbl.str_flags = be32toh(tbl.str_flags);
  97         if (!(tbl.str_flags & (STR_ORDERED | STR_RANDOM)))
  98                 errx(1, "nothing to do -- table in file order");
  99         Delimch = tbl.str_delim;
 100         order_unstr(&tbl);
 101         fclose(Inf);
 102         fclose(Dataf);
 103         exit(0);
 104 }
 105
 106 static void
 107 order_unstr(STRFILE *tbl)
 108 {
 109         uint32_t i;
 110         char *sp;
 111         off_t pos;
 112         char buf[BUFSIZ];
 113
 114         for (i = 0; i < tbl->str_numstr; i++) {
 115                 fread(&pos, 1, sizeof(pos), Dataf);
 116                 fseeko(Inf, be64toh(pos), SEEK_SET);
 117                 if (i != 0)
 118                         printf("%c\n", Delimch);
 119                 for (;;) {
 120                         sp = fgets(buf, sizeof(buf), Inf);
 121                         if (sp == NULL || STR_ENDSTRING(sp, *tbl))
 122                                 break;
 123                         else
 124                                 fputs(sp, stdout);
 125                 }
 126         }
 127 }