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config.cpp

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/********************************************************************
Description: class for managing simple config files
part of the 3Dsia project
created: StonedBones, 16.2.2000

History:
    date,   name,       changes,                    in funtion
    160200  StonedBones created source
    260200  StonedBones made minor bugfixes         setVariable (char*, int)
                                                    setVariable (char*, char*)

********************************************************************/

#include "config.h"

#include "intToChar.h"

#include <fstream>

void Config::readConfigFile () {
    ifstream in(confFile.c_str ());
    string   str, str2;
    
    try {
    if (!in) return;
    
    while (!in.eof ()) {
        in >> str;
    
        if (str.find ("[") == 0) {
        str2 = str.substr (1, str.length () - 2);
        cerr << "Found tag: " << str2 << "\n";
        } else if (str2.length () > 0) {
        string tmp;
        in >> tmp;
        
        if (tmp == "=") {
            in >> confMap[str2][str];
        };
        
        cerr << str << " = " << confMap[str2][str] << "\n";
        };
    };
    } catch (...) {
    cerr << "Exception in Config::readConfigFile !\n";
    };
    
};

/*...................................................................
Description: Constructor
Args: <none>
Returns: <none>
Created: StonedBones, 16.2.2000
[ToDo:]
[Comments:]
Changes:
-------------------------------------------------------------------*/

Config::Config () {
    confFile = "";
    actTag = "";
};

/*...................................................................
Description: Destructor
Args: <none>
Returns: <none>
Created: StonedBones, 16.2.2000
[ToDo:]
[Comments:]
Changes:
-------------------------------------------------------------------*/

Config::~Config () {
};

/*...................................................................
Description: opens a config file, creates it if not existant
Args: char* filename: filename of config file
Returns: true on success
Created: StonedBones, 16.2.2000
[ToDo:]
[Comments:]
Changes:
-------------------------------------------------------------------*/

bool Config::openConfig (char* filename) {
    confFile = filename;
    
    ifstream in(confFile.c_str ());
    if (!in) {
    ofstream out (confFile.c_str ());
    if (!out) return false;
    out.close ();
    
    in.open (confFile.c_str ());
    if (!in) return false;
    };
    
    readConfigFile ();
    
    return true;
};
    
/*...................................................................
Description: searches a tag ("[example_tag]")
Args: char* tag: tag-name
Returns: true if found
Created: StonedBones, 16.2.2000
[ToDo:]
[Comments:]
- positions the cursor right after the tag (use 'searchTag (actTag)' for
  resetting file cursor to actual tag)
Changes:
-------------------------------------------------------------------*/

bool Config::searchTag (char* tag) {
    if (confMap.find (tag) != confMap.end ()) {
    actTag = tag;
    return true;
    } else {
    return false;
    };
};
    
/*...................................................................
Description: creates a tag if it doesn't exist
Args: char* tag: tag-name
Returns: true on success
Created: StonedBones, 16.2.2000
[ToDo:]
[Comments:]
Changes:
-------------------------------------------------------------------*/

bool Config::createTag (char* tag) {
    ofstream out (confFile.c_str (), ofstream::app);
    
    if (!out) return false;
    
    actTag = tag;
    out << "[" << tag << "]\n";
    
    out.close ();
    
    return true;
};
    
/*...................................................................
Description: returns integer value of variable
Args: char* var: variable name
Returns: -111 on error (because -1 should be a legal number)
Created: StonedBones, 16.2.2000
[ToDo:]
[Comments:]
Changes:
-------------------------------------------------------------------*/

int Config::getIntVariable (char* var) {
    if (confFile.length () > 0) {
    return charToInt (const_cast<char*> (confMap[actTag][var].c_str ()));
    };

    return -111;
};

/*...................................................................
Description: returns string of a variable
Args: char* var: variable name
Returns: NULL on error, pointer to string on success
Created: StonedBones, 16.2.2000
[ToDo:]
[Comments:]
Changes:
-------------------------------------------------------------------*/

char* Config::getCharVariable (char* var) {
    if (confFile.length () > 0) {
    return const_cast<char*> (confMap[actTag][var].c_str ());
    };
    
    return NULL;
};

/*...................................................................
Description: sets value of a variable and creates it if it doesn't exist
Args: char* var: variable-name; int val: value
Returns: true on success
Created: StonedBones, 16.2.2000
[ToDo:]
[Comments:]
Changes:
-------------------------------------------------------------------*/

bool Config::setVariable (char* var, int val) {
    return setVariable (var, intToChar (val));
};

/*...................................................................
Description: sets string of a variable and creates it if it doesn't exist
Args: char* var: variable name; char* str: string
Returns: true on succes
Created: StonedBones, 16.2.2000
[ToDo:]
[Comments:]
Changes:
-------------------------------------------------------------------*/

bool Config::setVariable (char* var, char* str) {
    if (confFile.length () < 1) return false;
    
    try {
    ifstream in(confFile.c_str ());
    string   st, strTag, buffer1, buffer2;
    char     ch;
    
    strTag = "[";
    strTag += actTag;
    strTag += "]";
    
    
    buffer1 = buffer2 = "";
    
    while ((buffer1.find (strTag.c_str ()) != 0) && (!in.eof ())) {
        in.get (ch);
        if (!in.eof ()) buffer1 += ch;
    };

    while (!in.eof ()) {
        in.get (ch);
        if (!in.eof ()) buffer2 += ch;
    };
    
    in.close ();
    
    ofstream out (confFile.c_str ());
    
    out << buffer1;
    out << "\n";
    out << var;
    out << " = ";
    out << str;
    out << buffer2;

    out.close ();   
    
    readConfigFile ();
    
    return true;
    } catch (...) {
    cerr << "Exception in Config::setVariable (char*, char*)\n";
    return false;
    };

    return false;
};

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