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deb-goldedplus/goldlib/gall/gftnnlfu.cpp

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2000-02-25 10:15:17 +00:00
// This may look like C code, but it is really -*- C++ -*-
// ------------------------------------------------------------------
// The Goldware Library
// Copyright (C) 1990-1999 Odinn Sorensen
// Copyright (C) 1999-2000 Alexander S. Aganichev
// ------------------------------------------------------------------
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this program; if not, write to the Free
// Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
// MA 02111-1307, USA
// ------------------------------------------------------------------
// $Id$
// ------------------------------------------------------------------
// FIDOUSER.LST Indexing.
// ------------------------------------------------------------------
#include <gfilutil.h>
#include <gstrall.h>
#include <gftnnlfu.h>
// ------------------------------------------------------------------
bool ftn_fidouser_nodelist_index::getnode() {
#ifdef DEBUG
printf("<%05ld> ", node);
#endif
lseekset(fh, (node-1L)*62L);
if(read(fh, nodebuf, 62) == 62) {
nodebuf[60] = NUL;
char* ptr = strrchr(nodebuf, ' ');
if(ptr) {
data.addr.reset(ptr+1);
data.addr.make_string(data.address);
*ptr = NUL;
strtrim(nodebuf);
strunrevname(data.name, nodebuf);
*data.status = NUL;
*data.system = NUL;
*data.location = NUL;
*data.phone = NUL;
*data.baud = NUL;
*data.flags = NUL;
return true;
}
}
return false;
}
// ------------------------------------------------------------------
int ftn_fidouser_nodelist_index::namecmp() const {
#ifdef DEBUG
printf("[%s] [%s] ", searchname, nodebuf);
#endif
const char* a = searchname;
const char* b = nodebuf;
int n = 1;
int d;
while(1) {
d = tolower(*a) - tolower(*b);
if((d != 0) or (*a == NUL) or (*b == NUL))
break;
a++;
b++;
n++;
}
return d != 0 ? (d > 0 ? n : -n) : 0;
}
// ------------------------------------------------------------------
bool ftn_fidouser_nodelist_index::search() {
if(maxnode) {
long mid;
long left = 0;
long right = maxnode;
int diff = 0;
int prevdiff;
do {
mid = (left+right)/2;
node = mid + 1;
getnode();
prevdiff = diff;
diff = namecmp();
#ifdef DEBUG
printf("(%d)\n", diff);
#endif
if(diff < 0)
right = mid - 1;
else if(diff > 0)
left = mid + 1;
else {
exactmatch = true;
return true;
}
} while(left < right);
if(left < maxnode) {
node = left + 1;
getnode();
prevdiff = diff;
diff = namecmp();
#ifdef DEBUG
printf("(%d)\n", diff);
#endif
if(diff == 0) {
exactmatch = true;
return true;
}
}
if(absolute(prevdiff) > absolute(diff))
previous();
else {
prevdiff = diff;
if(next()) {
diff = namecmp();
#ifdef DEBUG
printf("(%d)\n", diff);
#endif
if(absolute(prevdiff) >= absolute(diff))
previous();
}
}
}
exactmatch = false;
return false;
}
// ------------------------------------------------------------------
ftn_fidouser_nodelist_index::ftn_fidouser_nodelist_index() {
fh = -1;
isopen = false;
nodebuf[62] = NUL;
node = 1;
namebrowse = true;
}
// ------------------------------------------------------------------
ftn_fidouser_nodelist_index::~ftn_fidouser_nodelist_index() {
if(isopen)
close();
}
// ------------------------------------------------------------------
bool ftn_fidouser_nodelist_index::open() {
if(isopen)
close();
// Open the list file
fh = ::sopen(nlpath, O_RDONLY|O_BINARY, SH_DENYNO, S_STDRD);
if(fh == -1) {
close();
return false;
}
maxnode = filelength(fh) / 62L;
getnode();
isopen = true;
return true;
}
// ------------------------------------------------------------------
void ftn_fidouser_nodelist_index::close() {
if(fh != -1) ::close(fh); fh = -1;
isopen = false;
}
// ------------------------------------------------------------------
bool ftn_fidouser_nodelist_index::find(const char* lookup_name) {
namebrowse = true;
struplow(strrevname(searchname, lookup_name));
return search();
}
// ------------------------------------------------------------------
bool ftn_fidouser_nodelist_index::previous() {
if(node > 1) {
node--;
bool retval = getnode();
compare();
return retval;
}
return false;
}
// ------------------------------------------------------------------
bool ftn_fidouser_nodelist_index::next() {
if(node < maxnode) {
node++;
bool retval = getnode();
compare();
return retval;
}
return false;
}
// ------------------------------------------------------------------
void ftn_fidouser_nodelist_index::first() {
node = 1;
getnode();
compare();
}
// ------------------------------------------------------------------
void ftn_fidouser_nodelist_index::last() {
node = maxnode;
getnode();
compare();
}
// ------------------------------------------------------------------
void ftn_fidouser_nodelist_index::push_state() {
statenode = node;
}
// ------------------------------------------------------------------
void ftn_fidouser_nodelist_index::pop_state() {
node = statenode;
getnode();
compare();
}
// ------------------------------------------------------------------
const char* ftn_fidouser_nodelist_index::index_name() const {
const char* ptr = strrchr(nlpath, '\\');
return ptr ? ptr+1 : nlpath;
}
// ------------------------------------------------------------------
const char* ftn_fidouser_nodelist_index::nodelist_name() const {
return NULL;
}
// ------------------------------------------------------------------