1 /*
2 * Copyright (c) 1989 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * James A. Woods.
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) 1989 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[] = "@(#)locate.bigram.c 4.7 (Berkeley) 6/1/90";
45 #endif /* not lint */
46
47 /*
48 * bigram < text > bigrams
49 *
50 * List bigrams for 'updatedb' script.
51 * Use 'code' to encode a file using this output.
52 */
53
54 #include <stdio.h>
55 #include <sys/param.h> /* for PATH_MAX */
56
57 char buf1[PATH_MAX] = " ";
58 char buf2[PATH_MAX];
59
main()60 main ( )
61 {
62 register char *cp;
63 register char *oldpath = buf1, *path = buf2;
64
65 while ( fgets ( path, sizeof(buf2), stdin ) != NULL ) {
66
67 /* skip longest common prefix */
68 for ( cp = path; *cp == *oldpath; cp++, oldpath++ )
69 if ( *oldpath == NULL )
70 break;
71 /*
72 * output post-residue bigrams only
73 */
74 while ( *cp != NULL && *(cp + 1) != NULL ) {
75 putchar ( *cp++ );
76 putchar ( *cp++ );
77 putchar ( '\n' );
78 }
79 if ( path == buf1 ) /* swap pointers */
80 path = buf2, oldpath = buf1;
81 else
82 path = buf1, oldpath = buf2;
83 }
84 }
85