1 /* $NetBSD: uniq.c,v 1.4 2008/04/28 20:24:17 martin Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-2-Clause 5 * 6 * Copyright (c) 2007 The NetBSD Foundation, Inc. 7 * All rights reserved. 8 * 9 * This code is derived from software contributed to The NetBSD Foundation 10 * by Christos Zoulas. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 23 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 * POSSIBILITY OF SUCH DAMAGE. 32 */ 33 #include <sys/cdefs.h> 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 /* NOTREACHED */ 92 default: 93 abort(); 94 break; 95 } 96 } 97 (void)fflush(stdout); 98 exit(0); 99 } 100 101 /* 102 * normalize whitespace in the original line and place a new string 103 * with whitespace converted to a single space in compline. If the line 104 * contains just comments, we preserve them. If it contains data and 105 * comments, we kill the comments. Return 1 if the line had actual 106 * contents, or 0 if it was just a comment without alphanumeric characters. 107 */ 108 static int 109 comp(const char *origline, char **compline, size_t *len) 110 { 111 const unsigned char *p; 112 unsigned char *q; 113 char *cline; 114 size_t l = *len, complen; 115 int hasalnum, iscomment; 116 117 /* Eat leading space */ 118 for (p = (const unsigned char *)origline; l && *p && isspace(*p); 119 p++, l--) 120 continue; 121 if (*p == '\0' || l == 0) 122 return 0; 123 124 if ((cline = malloc(l + 1)) == NULL) 125 err(1, "Cannot allocate %zu bytes", l + 1); 126 (void)memcpy(cline, p, l); 127 cline[l] = '\0'; 128 129 complen = 0; 130 hasalnum = 0; 131 iscomment = 0; 132 133 for (q = (unsigned char *)cline; l && *p; p++, l--) { 134 if (isspace(*p)) { 135 if (complen && isspace(q[-1])) 136 continue; 137 *q++ = ' '; 138 complen++; 139 } else { 140 if (!iscomment && *p == '#') { 141 if (hasalnum) 142 break; 143 iscomment = 1; 144 } else 145 hasalnum |= isalnum(*p); 146 *q++ = *p; 147 complen++; 148 } 149 } 150 151 /* Eat trailing space */ 152 while (complen && isspace(q[-1])) { 153 --q; 154 --complen; 155 } 156 *q = '\0'; 157 if (!hasalnum) { 158 free(cline); 159 cline = NULL; 160 complen = 0; 161 } 162 *compline = cline; 163 *len = complen; 164 return hasalnum; 165 } 166