1 /* $NetBSD: uniq.c,v 1.4 2008/04/28 20:24:17 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 2007 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christos Zoulas. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 #include <sys/cdefs.h> 32 __RCSID("$NetBSD: uniq.c,v 1.4 2008/04/28 20:24:17 martin Exp $"); 33 34 #include <stdio.h> 35 #include <string.h> 36 #include <stdlib.h> 37 #include <db.h> 38 #include <err.h> 39 #include <util.h> 40 #include <ctype.h> 41 #include <fcntl.h> 42 43 extern const HASHINFO hinfo; 44 45 void uniq(const char *); 46 static int comp(const char *, char **, size_t *); 47 48 /* 49 * Preserve only unique content lines in a file. Input lines that have 50 * content [alphanumeric characters before a comment] are white-space 51 * normalized and have their comments removed. Then they are placed 52 * in a hash table, and only the first instance of them is printed. 53 * Comment lines without any alphanumeric content are always printed 54 * since they are there to make the file "pretty". Comment lines with 55 * alphanumeric content are also placed into the hash table and only 56 * printed once. 57 */ 58 void 59 uniq(const char *fname) 60 { 61 DB *db; 62 DBT key; 63 static const DBT data = { NULL, 0 }; 64 FILE *fp; 65 char *line; 66 size_t len; 67 68 if ((db = dbopen(NULL, O_RDWR, 0, DB_HASH, &hinfo)) == NULL) 69 err(1, "Cannot create in memory database"); 70 71 fp = efopen(fname, "r"); 72 while ((line = fgetln(fp, &len)) != NULL) { 73 size_t complen = len; 74 char *compline; 75 if (!comp(line, &compline, &complen)) { 76 (void)fprintf(stdout, "%*.*s", (int)len, (int)len, 77 line); 78 continue; 79 } 80 key.data = compline; 81 key.size = complen; 82 switch ((db->put)(db, &key, &data, R_NOOVERWRITE)) { 83 case 0: 84 (void)fprintf(stdout, "%*.*s", (int)len, (int)len, 85 line); 86 break; 87 case 1: 88 break; 89 case -1: 90 err(1, "put"); 91 default: 92 abort(); 93 break; 94 } 95 } 96 (void)fflush(stdout); 97 exit(0); 98 } 99 100 /* 101 * normalize whitespace in the original line and place a new string 102 * with whitespace converted to a single space in compline. If the line 103 * contains just comments, we preserve them. If it contains data and 104 * comments, we kill the comments. Return 1 if the line had actual 105 * contents, or 0 if it was just a comment without alphanumeric characters. 106 */ 107 static int 108 comp(const char *origline, char **compline, size_t *len) 109 { 110 const unsigned char *p; 111 unsigned char *q; 112 char *cline; 113 size_t l = *len, complen; 114 int hasalnum, iscomment; 115 116 /* Eat leading space */ 117 for (p = (const unsigned char *)origline; l && *p && isspace(*p); 118 p++, l--) 119 continue; 120 cline = emalloc(l + 1); 121 (void)memcpy(cline, p, l); 122 cline[l] = '\0'; 123 if (*cline == '\0') 124 return 0; 125 126 complen = 0; 127 hasalnum = 0; 128 iscomment = 0; 129 130 for (q = (unsigned char *)cline; l && *p; p++, l--) { 131 if (isspace(*p)) { 132 if (complen && isspace(q[-1])) 133 continue; 134 *q++ = ' '; 135 complen++; 136 } else { 137 if (!iscomment && *p == '#') { 138 if (hasalnum) 139 break; 140 iscomment = 1; 141 } else 142 hasalnum |= isalnum(*p); 143 *q++ = *p; 144 complen++; 145 } 146 } 147 148 /* Eat trailing space */ 149 while (complen && isspace(q[-1])) { 150 --q; 151 --complen; 152 } 153 *q = '\0'; 154 *compline = cline; 155 *len = complen; 156 return hasalnum; 157 } 158