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unstr.c revision 1.2 
      1 /*-
      2  * Copyright (c) 1991 The Regents of the University of California.
      3  * 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. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by the University of
     19  *	California, Berkeley and its contributors.
     20  * 4. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  */
     36 
     37 #ifndef lint
     38 char copyright[] =
     39 "@(#) Copyright (c) 1991 The Regents of the University of California.\n\
     40  All rights reserved.\n";
     41 #endif /* not lint */
     42 
     43 #ifndef lint
     44 /*static char sccsid[] = "from: @(#)unstr.c	5.8 (Berkeley) 4/8/91";*/
     45 static char rcsid[] = "$Id: unstr.c,v 1.2 1993/08/01 18:54:39 mycroft Exp $";
     46 #endif /* not lint */
     47 
     48 /*
     49  *	This program un-does what "strfile" makes, thereby obtaining the
     50  * original file again.  This can be invoked with the name of the output
     51  * file, the input file, or both. If invoked with only a single argument
     52  * ending in ".dat", it is pressumed to be the input file and the output
     53  * file will be the same stripped of the ".dat".  If the single argument
     54  * doesn't end in ".dat", then it is presumed to be the output file, and
     55  * the input file is that name prepended by a ".dat".  If both are given
     56  * they are treated literally as the input and output files.
     57  *
     58  *	Ken Arnold		Aug 13, 1978
     59  */
     60 
     61 # include	<machine/endian.h>
     62 # include	<sys/param.h>
     63 # include	"strfile.h"
     64 # include	<stdio.h>
     65 # include	<ctype.h>
     66 
     67 # ifndef MAXPATHLEN
     68 # define	MAXPATHLEN	1024
     69 # endif	/* MAXPATHLEN */
     70 
     71 char	*Infile,			/* name of input file */
     72 	Datafile[MAXPATHLEN],		/* name of data file */
     73 	Delimch;			/* delimiter character */
     74 
     75 FILE	*Inf, *Dataf;
     76 
     77 char	*strcat(), *strcpy();
     78 
     79 /* ARGSUSED */
     80 main(ac, av)
     81 int	ac;
     82 char	**av;
     83 {
     84 	static STRFILE	tbl;		/* description table */
     85 
     86 	getargs(av);
     87 	if ((Inf = fopen(Infile, "r")) == NULL) {
     88 		perror(Infile);
     89 		exit(1);
     90 	}
     91 	if ((Dataf = fopen(Datafile, "r")) == NULL) {
     92 		perror(Datafile);
     93 		exit(1);
     94 	}
     95 	(void) fread((char *) &tbl, sizeof tbl, 1, Dataf);
     96 	tbl.str_version = ntohl(tbl.str_version);
     97 	tbl.str_numstr = ntohl(tbl.str_numstr);
     98 	tbl.str_longlen = ntohl(tbl.str_longlen);
     99 	tbl.str_shortlen = ntohl(tbl.str_shortlen);
    100 	tbl.str_flags = ntohl(tbl.str_flags);
    101 	if (!(tbl.str_flags & (STR_ORDERED | STR_RANDOM))) {
    102 		fprintf(stderr, "nothing to do -- table in file order\n");
    103 		exit(1);
    104 	}
    105 	Delimch = tbl.str_delim;
    106 	order_unstr(&tbl);
    107 	(void) fclose(Inf);
    108 	(void) fclose(Dataf);
    109 	exit(0);
    110 }
    111 
    112 getargs(av)
    113 register char	*av[];
    114 {
    115 	if (!*++av) {
    116 		(void) fprintf(stderr, "usage: unstr datafile\n");
    117 		exit(1);
    118 	}
    119 	Infile = *av;
    120 	(void) strcpy(Datafile, Infile);
    121 	(void) strcat(Datafile, ".dat");
    122 }
    123 
    124 order_unstr(tbl)
    125 register STRFILE	*tbl;
    126 {
    127 	register int	i;
    128 	register char	*sp;
    129 	auto off_t	pos;
    130 	char		buf[BUFSIZ];
    131 
    132 	for (i = 0; i < tbl->str_numstr; i++) {
    133 		(void) fread((char *) &pos, 1, sizeof pos, Dataf);
    134 		(void) fseek(Inf, ntohl(pos), 0);
    135 		if (i != 0)
    136 			(void) printf("%c\n", Delimch);
    137 		for (;;) {
    138 			sp = fgets(buf, sizeof buf, Inf);
    139 			if (sp == NULL || STR_ENDSTRING(sp, *tbl))
    140 				break;
    141 			else
    142 				fputs(sp, stdout);
    143 		}
    144 	}
    145 }
    146