// File:	namevalu.cpp
// Author:	Tyler Devore
// Description:	This file contains the NameValueList class methods.
// change: added fill(). -Dave Hershberger

#include "namevalu.h"
#include <stdio.h>
#include <string.h>

// function: fill
// fills a NameValueList with name-value pairs from a file
int NameValueList::read(char *filename)
{
  FILE *file_ptr;		// pointer to configuration file
  char value[BUF];		// value string read from file
  char string[BUF];		// name string read from file
  // a subsystem.
  
  file_ptr = fopen(filename, "r");
  if (!file_ptr)
    return 0;
  
  while(!feof(file_ptr)) {
    string[0] = '\0';
    if(fscanf(file_ptr, "%s", string) == EOF) // get first string
      continue;

    if(string[0] == '*' || string[0] == '#'){ // * or # marks a comment.
      fgets(string, BUF, file_ptr); // therefore, grab a
      continue;			      // line and ignore it.
    }
    value[0] = '\0';
    fscanf(file_ptr, "%s", value); // get next string.
    // add the pair to the current list
    add(string, value);
  }
  fclose(file_ptr);
  return 1;
}

// function:	add
// description: adds a name value pair to the list
void NameValueList::add(char str[], char val[])
{
  NameValueListeLem* temp = new NameValueListeLem; // create a new element
  
  temp->next = first();	     // link to list
  strcpy(temp->string, str);
  strcpy(temp->value, val);
  h = temp;			// update head of list
}

// function:	print
// description:	used for testing NameValueList.  prints values in list.
void NameValueList::print()
{
  NameValueListeLem* temp = first();
  
  while(temp!=0)		// detect end of NameValueList
    {
      printf("%s -> %s\n", temp->string, temp->value);
      temp = temp->next;
    }
}

// function:	release
// description:	returns memory in NameValueList to free store
void NameValueList::release()	// elements are returned to free store
{
  while(first() != 0)
    del();
}