1 /* 2 * SPDX-License-Identifier: BSD-4-Clause 3 * 4 * Copyright (c) 1995 Wolfram Schneider <wosch@FreeBSD.org>. Berlin. 5 * Copyright (c) 1989, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * James A. Woods. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * $FreeBSD: head/usr.bin/locate/bigram/locate.bigram.c 325966 2017-11-18 14:26:50Z pfg $ 40 * 41 * @(#) Copyright (c) 1989, 1993 The Regents of the University of California. All rights reserved. 42 * @(#)locate.bigram.c 8.1 (Berkeley) 6/6/93 43 */ 44 45 /* 46 * bigram < sorted_file_names | sort -nr | 47 * awk 'NR <= 128 { printf $2 }' > bigrams 48 * 49 * List bigrams for 'updatedb' script. 50 * Use 'code' to encode a file using this output. 51 */ 52 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <sys/param.h> /* for MAXPATHLEN */ 56 #include "locate.h" 57 58 static u_char buf1[MAXPATHLEN] = " "; 59 static u_char buf2[MAXPATHLEN]; 60 static u_int bigram[UCHAR_MAX + 1][UCHAR_MAX + 1]; 61 62 int 63 main(void) 64 { 65 u_char *cp; 66 u_char *oldpath = buf1, *path = buf2; 67 u_int i, j; 68 69 while (fgets(path, sizeof(buf2), stdin) != NULL) { 70 71 /* 72 * We don't need remove newline character '\n'. 73 * '\n' is less than ASCII_MIN and will be later 74 * ignored at output. 75 */ 76 77 78 /* skip longest common prefix */ 79 for (cp = path; *cp == *oldpath; cp++, oldpath++) 80 if (*cp == '\0') 81 break; 82 83 while (*cp != '\0' && *(cp + 1) != '\0') { 84 bigram[(u_char)*cp][(u_char)*(cp + 1)]++; 85 cp += 2; 86 } 87 88 /* swap pointers */ 89 if (path == buf1) { 90 path = buf2; 91 oldpath = buf1; 92 } else { 93 path = buf1; 94 oldpath = buf2; 95 } 96 } 97 98 /* output, boundary check */ 99 for (i = ASCII_MIN; i <= ASCII_MAX; i++) 100 for (j = ASCII_MIN; j <= ASCII_MAX; j++) 101 if (bigram[i][j] != 0) 102 (void)printf("%4u %c%c\n", bigram[i][j], i, j); 103 104 exit(0); 105 } 106