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keyvalue.cc
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keyvalue.cc
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/*
* lftp - file transfer program
*
* Copyright (c) 1996-2012 by Alexander V. Lukyanov (lav@yars.free.net)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include "keyvalue.h"
#include <unistd.h>
#include "trio.h"
#include <fcntl.h>
#include <errno.h>
int KeyValueDB::Read(int fd)
{
xstring key;
xstring value;
int c;
FILE *f=fdopen(fd,"r");
for(;;)
{
c=getc(f);
// skip leading space
while(c!=EOF && (c==' ' || c=='\t'))
c=getc(f);
if(c==EOF)
break;
if(c=='\n')
continue; // next line
key.truncate(0);
for(;;)
{
key.append(c);
c=getc(f);
if(c==EOF)
break;
if(c==' ' || c=='\t' || c=='\n')
break;
}
if(c==EOF || c=='\n' || key.length()==0)
break; // invalid line
// skip space in mid
while(c!=EOF && (c==' ' || c=='\t'))
c=getc(f);
if(c==EOF || c=='\n')
break;
value.truncate(0);
for(;;)
{
value.append(c);
c=getc(f);
if(c==EOF)
break;
if(c=='\n')
break;
}
Add(key,value);
if(c==EOF)
break;
}
fclose(f);
return 0;
}
int KeyValueDB::VKeyCompare(const void *a,const void *b)
{
KeyValueDB::Pair *pa=*(KeyValueDB::Pair*const*)a;
KeyValueDB::Pair *pb=*(KeyValueDB::Pair*const*)b;
return KeyValueDB::KeyCompare(pa,pb);
}
void KeyValueDB::Sort()
{
int count=0;
Pair *scan;
for(scan=chain; scan; scan=scan->next)
count++;
if(count==0)
return;
Pair **arr=(Pair**)alloca(count*sizeof(*arr));
count=0;
for(scan=chain; scan; scan=scan->next)
arr[count++]=scan;
qsort(arr,count,sizeof(*arr),&KeyValueDB::VKeyCompare);
chain=0;
while(count--)
{
arr[count]->next=chain;
chain=arr[count];
}
}
char *KeyValueDB::Format(StringMangler value_mangle)
{
Sort();
Pair *p;
int max_key_len=0;
for(p=chain; p; p=p->next)
{
int len=strlen(p->key);
if(len>max_key_len)
max_key_len=len;
}
max_key_len&=~7; // save some bytes
xstring buf("");
for(p=chain; p; p=p->next)
buf.appendf("%-*s\t%s\n",max_key_len,p->key.get(),value_mangle(p->value));
return buf.borrow();
}
int KeyValueDB::Write(int fd)
{
xstring_ca buf(Format());
int res=write(fd,buf,strlen(buf));
close(fd);
return res;
}
void KeyValueDB::Add(const char *key,const char *value)
{
Pair **p=LookupPair(key);
if(!p)
AddPair(NewPair(key,value));
else
p[0]->SetValue(value);
}
void KeyValueDB::Remove(const char *key)
{
Pair **p=LookupPair(key);
if(p)
Purge(p);
}
KeyValueDB::Pair **KeyValueDB::LookupPair(const char *key) const
{
for(const Pair * const*p=&chain; *p; p=&(*p)->next)
{
if((*p)->KeyCompare(key)==0)
return const_cast<KeyValueDB::Pair **>(p);
}
return 0;
}
const char *KeyValueDB::Lookup(const char *key) const
{
const Pair * const*p=LookupPair(key);
return p ? (*p)->value.get() : 0;
}
int KeyValueDB::Lock(int fd,int type)
{
struct flock lk;
lk.l_type=type;
lk.l_whence=0;
lk.l_start=0;
lk.l_len=0;
int res=fcntl(fd,F_SETLK,&lk);
if(res==-1 && E_RETRY(errno))
{
int retries=5;
bool echo=true;
for(int i=0; i<retries; i++)
{
sleep(1);
if(echo && write(2,".",1)==-1)
echo=false;
res=fcntl(fd,F_SETLK,&lk);
if(res==0)
break;
}
if(echo && write(2,"\r",1)==-1)
echo=false;
}
if(res==-1 && E_LOCK_IGNORE(errno))
return 0;
return res;
}