mdp_prompt.h

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const char STD_INPUT[] = "";
const char STD_INPUT_FILE[] = "<stdin>";

double val(string s) {
  return atof(s.c_str());
}


string prompt(string filename, 
              string variable, 
              string def_val="0.0", 
              int p=0) {
  FILE *fp=0;
  static char tmp[1024];
  int active, length;
  char c,d;
  char response[1024];

#ifdef PARALLEL
  mpi.barrier();
#endif

  if(ME==p) {
    if(filename==STD_INPUT) {
      printf("Input value of %s (default is `%s'): ", 
             variable.c_str(), def_val.c_str());
      cin >> response;
    } else {
      if(filename==STD_INPUT_FILE) { 
        fp=stdin;
        printf("Input variable (default is `%s %s')...\n", 
               variable.c_str(), def_val.c_str());
      } else {
        fp=fopen(filename.c_str(),"r");
      }
      fseek(fp, 0, 0);
      active=1;
      length=0;
      d=0;
      tmp[0]='\0';
      response[0]='\0';
      do {
        c=fgetc(fp);    
        switch(active) {
        case 0: if(c=='\n') {active=1; length=0;} break;
        case 1: if(c=='#') { 
          active=0;
        } else if((length>0) && ((c==' ') || (c=='\t'))) {
          active=2; length=0;
        } else if((length>0) && (c=='\n')) {
          active=1; length=0;
          if(variable==tmp) c=EOF;
        } else if((c!=' ') && (c!='\t') && (c!='\n')) {
          tmp[length]=c; tmp[length+1]='\0'; length++; 
        } break;        
        case 2: if(c=='#') { 
          active=0;
        } else if((c=='\n') || (c==EOF)) {
          active=1;
          length=0;
          if(variable==tmp) d=1;
        } else if((length==0) && ((c==' ') || (c=='\t') || (c=='='))) {
          // do nothing
        } else if((c==' ') || (c=='\t')) {
          active=0;
          if(variable==tmp) d=1;
        } else { 
          response[length]=c; response[length+1]='\0'; length++; 
        } break;
        }
        // printf("%i %c %s %s\n", active, c, tmp, response);
      } while ((c!=EOF) && (d!=1));

      if((d==0) || (strcmp(response,"")==0)) 
        strcpy(response, def_val.c_str());
      
      if(fp!=stdin && fp!=0) 
        fclose(fp);
    }
    printf("... Adopting %s equal to \"%s\"\n\n", variable.c_str(), response);
  }

#ifdef PARALLEL
  mpi.broadcast(response, 1024, p);
#endif
  string s(response);
  return s;
}

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