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/* $NetBSD: uniq.c,v 1.4 2008/04/28 20:24:17 martin Exp $ */
/*-
* Copyright (c) 2007 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <db.h>
#include <err.h>
#include <libutil.h>
#include <ctype.h>
#include <fcntl.h>
extern const HASHINFO hinfo;
void uniq(const char *);
static int comp(const char *, char **, size_t *);
/*
* Preserve only unique content lines in a file. Input lines that have
* content [alphanumeric characters before a comment] are white-space
* normalized and have their comments removed. Then they are placed
* in a hash table, and only the first instance of them is printed.
* Comment lines without any alphanumeric content are always printed
* since they are there to make the file "pretty". Comment lines with
* alphanumeric content are also placed into the hash table and only
* printed once.
*/
void
uniq(const char *fname)
{
DB *db;
DBT key;
static const DBT data = { NULL, 0 };
FILE *fp;
char *line;
size_t len;
if ((db = dbopen(NULL, O_RDWR, 0, DB_HASH, &hinfo)) == NULL)
err(1, "Cannot create in memory database");
if ((fp = fopen(fname, "r")) == NULL)
err(1, "Cannot open `%s'", fname);
while ((line = fgetln(fp, &len)) != NULL) {
size_t complen = len;
char *compline;
if (!comp(line, &compline, &complen)) {
(void)fprintf(stdout, "%*.*s", (int)len, (int)len,
line);
continue;
}
key.data = compline;
key.size = complen;
switch ((db->put)(db, &key, &data, R_NOOVERWRITE)) {
case 0:
(void)fprintf(stdout, "%*.*s", (int)len, (int)len,
line);
break;
case 1:
break;
case -1:
err(1, "put");
default:
abort();
break;
}
}
(void)fflush(stdout);
exit(0);
}
/*
* normalize whitespace in the original line and place a new string
* with whitespace converted to a single space in compline. If the line
* contains just comments, we preserve them. If it contains data and
* comments, we kill the comments. Return 1 if the line had actual
* contents, or 0 if it was just a comment without alphanumeric characters.
*/
static int
comp(const char *origline, char **compline, size_t *len)
{
const unsigned char *p;
unsigned char *q;
char *cline;
size_t l = *len, complen;
int hasalnum, iscomment;
/* Eat leading space */
for (p = (const unsigned char *)origline; l && *p && isspace(*p);
p++, l--)
continue;
if ((cline = malloc(l + 1)) == NULL)
err(1, "Cannot allocate %zu bytes", l + 1);
(void)memcpy(cline, p, l);
cline[l] = '\0';
if (*cline == '\0')
return 0;
complen = 0;
hasalnum = 0;
iscomment = 0;
for (q = (unsigned char *)cline; l && *p; p++, l--) {
if (isspace(*p)) {
if (complen && isspace(q[-1]))
continue;
*q++ = ' ';
complen++;
} else {
if (!iscomment && *p == '#') {
if (hasalnum)
break;
iscomment = 1;
} else
hasalnum |= isalnum(*p);
*q++ = *p;
complen++;
}
}
/* Eat trailing space */
while (complen && isspace(q[-1])) {
--q;
--complen;
}
*q = '\0';
*compline = cline;
*len = complen;
return hasalnum;
}
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