[unix-history] / usr / src / games / fortune / unstr / unstr.c

/*
* Copyright (c) 1989 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ken Arnold.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley.  The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1989 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)unstr.c     5.6 (Berkeley) %G%";
#endif /* not lint */

/*
*      This program un-does what "strfile" makes, thereby obtaining the
* original file again.  This can be invoked with the name of the output
* file, the input file, or both. If invoked with only a single argument
* ending in ".dat", it is pressumed to be the input file and the output
* file will be the same stripped of the ".dat".  If the single argument
* doesn't end in ".dat", then it is presumed to be the output file, and
* the input file is that name prepended by a ".dat".  If both are given
* they are treated literally as the input and output files.
*
*      Ken Arnold              Aug 13, 1978
*/

# include       <machine/endian.h>
# include       <sys/param.h>
# include       "strfile.h"
# include       <stdio.h>
# include       <ctype.h>

# ifndef MAXPATHLEN
# define        MAXPATHLEN      1024
# endif /* MAXPATHLEN */

char    *Infile,                        /* name of input file */
       Datafile[MAXPATHLEN],           /* name of data file */
       Delimch;                        /* delimiter character */

FILE    *Inf, *Dataf;

char    *strcat(), *strcpy();

/* ARGSUSED */
main(ac, av)
int     ac;
char    **av;
{
       static STRFILE  tbl;            /* description table */

       getargs(av);
       if ((Inf = fopen(Infile, "r")) == NULL) {
               perror(Infile);
               exit(1);
       }
       if ((Dataf = fopen(Datafile, "r")) == NULL) {
               perror(Datafile);
               exit(1);
       }
       (void) fread((char *) &tbl, sizeof tbl, 1, Dataf);
       tbl.str_version = ntohl(tbl.str_version);
       tbl.str_numstr = ntohl(tbl.str_numstr);
       tbl.str_longlen = ntohl(tbl.str_longlen);
       tbl.str_shortlen = ntohl(tbl.str_shortlen);
       tbl.str_flags = ntohl(tbl.str_flags);
       if (!(tbl.str_flags & (STR_ORDERED | STR_RANDOM))) {
               fprintf(stderr, "nothing to do -- table in file order\n");
               exit(1);
       }
       Delimch = tbl.str_delim;
       order_unstr(&tbl);
       (void) fclose(Inf);
       (void) fclose(Dataf);
       exit(0);
}

getargs(av)
register char   *av[];
{
       if (!*++av) {
               (void) fprintf(stderr, "usage: unstr datafile\n");
               exit(1);
       }
       Infile = *av;
       (void) strcpy(Datafile, Infile);
       (void) strcat(Datafile, ".dat");
}

order_unstr(tbl)
register STRFILE        *tbl;
{
       register int    i;
       register char   *sp;
       auto off_t      pos;
       char            buf[BUFSIZ];

       for (i = 0; i < tbl->str_numstr; i++) {
               (void) fread((char *) &pos, 1, sizeof pos, Dataf);
               (void) fseek(Inf, ntohl(pos), 0);
               if (i != 0)
                       (void) printf("%c\n", Delimch);
               for (;;) {
                       sp = fgets(buf, sizeof buf, Inf);
                       if (sp == NULL || STR_ENDSTRING(sp, *tbl))
                               break;
                       else
                               fputs(sp, stdout);
               }
       }
}