Errors.h

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/* -*- C++ -*- */
#ifndef _ERRORS_H_
#define _ERRORS_H_

#include <string.h>

// a collection of exceptions that can be thrown

class Exception {};

class IOException : public Exception {
public:
    IOException(const char* msg = NULL) : message(NULL) {
        setMessage(msg);
    }
    ~IOException() {
        if(message) {
            delete message;
            message = NULL;
        }
    }
    void setMessage(const char* msg=NULL) {
        if(!msg) {
            if(message) {
                if(message[0] != 0) {
                    delete message;
                    message = new char[1];
                    message[0] = 0;
                }
            } else {
                message = new char[1];
                message[0] = 0;
            }
            return;
        }
        int len = strlen(msg);
        if(!len) setMessage(NULL);
        message = new char[len+1];
        strcpy(message, msg);
    }
    const char* getMessage() const { return message; }
protected:
    char *message;
};

class SyntaxErrorException : public IOException {};

#endif