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/*
* $Id$
*
* This file is part of WorkMan, the civilized CD player library
* (c) 1991-1997 by Steven Grimm (original author)
* (c) by Dirk Försterling (current 'author' = maintainer)
* The maintainer can be contacted by his e-mail address:
* milliByte@DeathsDoor.com
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*
* Build a WorkMan database index file from a flat text file. Requires
* 4.4BSD libdb library.
*/
static char buildindex_id[] = "$Id$";
#include <stdio.h>
#include <db.h>
#include <fcntl.h>
#include <errno.h>
#include <netinet/in.h> /* for htonl() */
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <unistd.h>
char *strrchr();
main(argc, argv)
int argc;
char **argv;
{
DB *db;
DBT key, data;
FILE *fp;
int lock = 1, i = 0, locked, frame;
char buf[1000], indname[MAXPATHLEN + 100], framebuf[8], *c;
unsigned long pos;
BTREEINFO bt;
struct stat st;
if (argc > 2 && !strcmp(argv[1], "-n"))
{
lock = 0;
i++;
}
if (argc < i + 2)
{
fprintf(stderr, "Usage: %s [-n] dbfile [dbfile ...]\n",
argv[0]);
exit(1);
}
data.data = &pos;
data.size = sizeof(pos);
key.data = framebuf;
key.size = 7; /* %07d */
while (++i < argc)
{
fprintf(stderr, "Building index for %s\n", argv[i]);
if ((fp = fopen(argv[i], "r")) == NULL)
{
perror(argv[i]);
continue;
}
/*
* Figure out the file's mode, uid, gid, so we can set the
* permissions on the index file to the same thing.
*/
if (fstat(fileno(fp), &st))
{
sprintf(indname, "%s: fstat", argv[i]);
perror(indname);
fclose(fp);
continue;
}
if (lock && lockit(fileno(fp), F_WRLCK))
{
sprintf(indname, "%s: Warning: Couldn't lock", argv[i]);
perror(indname);
locked = 0;
}
else
locked = 1;
/*
* Create a database file.
*/
bt.flags = R_DUP; /* allow duplicate keys */
bt.cachesize = 0;
bt.psize = 0;
bt.lorder = 4321;
bt.minkeypage = 0;
bt.compare = NULL; /* use lexical comparison */
bt.prefix = NULL; /* no prefix comparisons */
/* Index files have ".ind" extensions */
sprintf(indname, "%s.ind", argv[i]);
if ((db = dbopen(indname, O_CREAT | O_RDWR | O_TRUNC,
st.st_mode, DB_BTREE, &bt)) == NULL)
{
perror(indname);
if (locked)
lockit(fileno(fp), F_UNLCK);
fclose(fp);
continue;
}
/*
* Now loop through the text file, inserting a record into
* the index file for each "tracks" line.
*/
while (! feof(fp))
{
pos = ftell(fp);
buf[0] = '\0';
if (fgets(buf, sizeof(buf), fp) == NULL || ! buf[0])
{
/* End of file? */
if (feof(fp))
break;
/* Nope. A read error. Unlink the database. */
perror(argv[i]);
(void) unlink(indname);
break;
}
if (strncmp(buf, "tracks ", 7))
continue;
/*
* Found the start of a record. Figure out the start
* time of the last track and put an entry in the
* index file with that as the key.
*/
c = strrchr(buf, ' '); /* this will always succeed */
*c = '\0';
c = strrchr(buf, ' '); /* this should too, but... */
if (c == NULL)
{
fprintf(stderr,
"%s: Malformed tracks line at %lu\n",
argv[i], pos);
continue;
}
sscanf(c+1, "%d", &frame);
sprintf(framebuf, "%07d", frame);
pos = htonl(pos);
if ((db->put)(db, &key, &data, 0))
{
perror(indname);
unlink(indname);
break;
}
}
/*
* Clean up.
*/
(void) (db->close)(db);
if (locked)
lockit(fileno(fp), F_UNLCK);
}
}
/*
* Lock a file. Time out after a little while if we can't get a lock;
* this usually means the locking system is broken.
*
* Unfortunately, if there are lots of people contending for a lock,
* this can result in the file not getting locked when it probably should.
*/
int
lockit(fd, type)
int fd;
int type;
{
struct flock fl;
int result, timer = 0;
fl.l_type = type;
fl.l_whence = 0;
fl.l_start = 0;
fl.l_len = 0;
while ((result = fcntl(fd, F_SETLK, &fl)) < 0)
{
if (errno != EACCES || errno != EAGAIN)
break;
if (timer++ == 30)
{
errno = ETIMEDOUT;
break;
}
sleep(1);
}
return (result);
}
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