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// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
// $Id: configuration.cc,v 1.3 1998/07/12 23:58:44 jgg Exp $
/* ######################################################################
Configuration Class
This class provides a configuration file and command line parser
for a tree-oriented configuration environment. All runtime configuration
is stored in here.
##################################################################### */
/*}}}*/
// Include files /*{{{*/
#ifdef __GNUG__
#pragma implementation "apt-pkg/configuration.h"
#endif
#include <apt-pkg/configuration.h>
#include <strutl.h>
#include <stdio.h>
/*}}}*/
Configuration *_config = new Configuration;
// Configuration::Configuration - Constructor /*{{{*/
// ---------------------------------------------------------------------
/* */
Configuration::Configuration()
{
Root = new Item;
}
/*}}}*/
// Configuration::Lookup - Lookup a single item /*{{{*/
// ---------------------------------------------------------------------
/* This will lookup a single item by name below another item. It is a
helper function for the main lookup function */
Configuration::Item *Configuration::Lookup(Item *Head,const char *S,
unsigned long Len,bool Create)
{
int Res = 1;
Item *I = Head->Child;
Item **Last = &Head->Child;
for (; I != 0; Last = &I->Next, I = I->Next)
if ((Res = stringcasecmp(I->Tag.begin(),I->Tag.end(),S,S + Len)) == 0)
break;
if (Res == 0)
return I;
if (Create == false)
return 0;
I = new Item;
I->Tag = string(S,Len);
I->Next = *Last;
I->Parent = Head;
*Last = I;
return I;
}
/*}}}*/
// Configuration::Lookup - Lookup a fully scoped item /*{{{*/
// ---------------------------------------------------------------------
/* This performs a fully scoped lookup of a given name, possibly creating
new items */
Configuration::Item *Configuration::Lookup(const char *Name,bool Create)
{
const char *Start = Name;
const char *End = Start + strlen(Name);
const char *TagEnd = Name;
Item *Itm = Root;
for (; End - TagEnd > 2; TagEnd++)
{
if (TagEnd[0] == ':' && TagEnd[1] == ':')
{
Itm = Lookup(Itm,Start,TagEnd - Start,Create);
if (Itm == 0)
return 0;
TagEnd = Start = TagEnd + 2;
}
}
Itm = Lookup(Itm,Start,End - Start,Create);
return Itm;
}
/*}}}*/
// Configuration::Find - Find a value /*{{{*/
// ---------------------------------------------------------------------
/* */
string Configuration::Find(const char *Name,const char *Default)
{
Item *Itm = Lookup(Name,false);
if (Itm == 0 || Itm->Value.empty() == true)
{
if (Default == 0)
return string();
else
return Default;
}
return Itm->Value;
}
/*}}}*/
// Configuration::FindDir - Find a directory /*{{{*/
// ---------------------------------------------------------------------
/* Directories are stored as the base dir in the Parent node and the
*/
string Configuration::FindDir(const char *Name,const char *Default = 0)
{
Item *Itm = Lookup(Name,false);
if (Itm == 0 || Itm->Value.empty() == true)
{
if (Default == 0)
return string();
else
return Default;
}
if (Itm->Value[0] == '/' || Itm->Parent == 0)
return Itm->Value;
if (Itm->Parent->Value.end()[-1] == '/')
return Itm->Parent->Value + Itm->Value;
else
return Itm->Parent->Value + '/' + Itm->Value;
}
/*}}}*/
// Configuration::FindI - Find an integer value /*{{{*/
// ---------------------------------------------------------------------
/* */
int Configuration::FindI(const char *Name,int Default)
{
Item *Itm = Lookup(Name,false);
if (Itm == 0 || Itm->Value.empty() == true)
return Default;
char *End;
int Res = strtol(Itm->Value.c_str(),&End,0);
if (End == Itm->Value.c_str())
return Default;
return Res;
}
/*}}}*/
// Configuration::Set - Set a value /*{{{*/
// ---------------------------------------------------------------------
/* */
void Configuration::Set(const char *Name,string Value)
{
Item *Itm = Lookup(Name,true);
if (Itm == 0)
return;
Itm->Value = Value;
}
/*}}}*/
// Configuration::Set - Set an integer value /*{{{*/
// ---------------------------------------------------------------------
/* */
void Configuration::Set(const char *Name,int Value)
{
Item *Itm = Lookup(Name,true);
if (Itm == 0)
return;
char S[300];
snprintf(S,sizeof(S),"%i",Value);
Itm->Value = S;
}
/*}}}*/
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