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 __FBSDID("$FreeBSD$"); 33 34 #include <stdio.h> 35 #include <string.h> 36 #include <stdlib.h> 37 #include <db.h> 38 #include <err.h> 39 #include <libutil.h> 40 #include <ctype.h> 41 #include <fcntl.h> 42 43 #include "extern.h" 44 45 static int comp(const char *, char **, size_t *); 46 47 /* 48 * Preserve only unique content lines in a file. Input lines that have 49 * content [alphanumeric characters before a comment] are white-space 50 * normalized and have their comments removed. Then they are placed 51 * in a hash table, and only the first instance of them is printed. 52 * Comment lines without any alphanumeric content are always printed 53 * since they are there to make the file "pretty". Comment lines with 54 * alphanumeric content are also placed into the hash table and only 55 * printed once. 56 */ 57 void 58 uniq(const char *fname) 59 { 60 DB *db; 61 DBT key; 62 static const DBT data = { NULL, 0 }; 63 FILE *fp; 64 char *line; 65 size_t len; 66 67 if ((db = dbopen(NULL, O_RDWR, 0, DB_HASH, &hinfo)) == NULL) 68 err(1, "Cannot create in memory database"); 69 70 if ((fp = fopen(fname, "r")) == NULL) 71 err(1, "Cannot open `%s'", fname); 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 if ((cline = malloc(l + 1)) == NULL) 121 err(1, "Cannot allocate %zu bytes", l + 1); 122 (void)memcpy(cline, p, l); 123 cline[l] = '\0'; 124 if (*cline == '\0') 125 return 0; 126 127 complen = 0; 128 hasalnum = 0; 129 iscomment = 0; 130 131 for (q = (unsigned char *)cline; l && *p; p++, l--) { 132 if (isspace(*p)) { 133 if (complen && isspace(q[-1])) 134 continue; 135 *q++ = ' '; 136 complen++; 137 } else { 138 if (!iscomment && *p == '#') { 139 if (hasalnum) 140 break; 141 iscomment = 1; 142 } else 143 hasalnum |= isalnum(*p); 144 *q++ = *p; 145 complen++; 146 } 147 } 148 149 /* Eat trailing space */ 150 while (complen && isspace(q[-1])) { 151 --q; 152 --complen; 153 } 154 *q = '\0'; 155 *compline = cline; 156 *len = complen; 157 return hasalnum; 158 } 159