/*  smmoutfl.cpp  by K.Tsuru  */
// function ID = 004    DRADIX
/************************
SNManager class
Change the output stream.
*************************/
#ifndef SN_H
#include "sn.h"
#endif
static FILE* openStream = NULL;
static int open = -1;

void SNManager::CloseFile(){
    if(open > 0) SNManager::OutPutFile(NULL);
}
// function ID = 004
// a static function of SNManager class
FILE* SNManager::OutPutFile(const char* fname, bool ovw){
    if(fname == NULL){
        if(stream == openStream) fclose(openStream);
        stream = stdout;    open = 0;
        return stream;
    }
    if( (ovw == false) && (openStream = fopen(fname,"rt")) != NULL){
        fprintf(stderr, "\aFile \"%s\" already exists. Over write ?(y/n) ", fname);
        if( YesOrNo() == 0){
            fclose(openStream);
                stream = stdout;    open = 0;
            fprintf(stderr, "Do you continue ?(y/n) ");
            if(YesOrNo() == 0) exit(EXIT_FAILURE);
            return stream;
        }
    }
    openStream = fopen(fname,"wt");
    if(openStream == NULL){
        fprintf(stderr, "Cannot open output file %s.\n", fname);
        exit(EXIT_FAILURE);
    } else {
        open = 1;
    }
    stream = openStream;
    return stream;
}