/* File: util.c
   Author: Xiuwen Liu
   Created on: Sept. 25, 2003
   Description: It includes a set of functions used by the main and other 
                functions..
   Compile:
      See makefile
*/

#define UTIL_SOURCE_C_C
#include "util.h"

int Count_Item_InFile(char *fname)
{
  FILE *fp;
  int nitem, tmp;
  char *temp_buf;
  struct stat stat_buf;
  fp = fopen(fname,"rb");
  if (fp == NULL) {
    fprintf(stderr,"Cannot open file \"%s\" for reading.\n",
	    fname);
    return -1;
  }
  fstat(fileno(fp), &stat_buf);
  /* To be safe, we allocate a large enough buffer */
  temp_buf =(char *)malloc(sizeof(char)*(stat_buf.st_size+1));
  nitem = 0;
  do {
    if (fscanf(fp,"%d%s", &tmp, temp_buf)==2) {
      nitem++;
    }
    else {
      break;
    }
  } while(1);
  fclose(fp);
  free(temp_buf);
  return nitem;
}

int Read_Items_FromFile(char *fname, WORD_INFO *words, int nitem)
{
  FILE *fp;
  int item_read;
  char *temp_buf;
  struct stat stat_buf;
  fp = fopen(fname,"rb");
  if (fp == NULL) {
    fprintf(stderr,"Cannot open file \"%s\" for reading.\n",
	    fname);
    return -1;
  }
  fstat(fileno(fp), &stat_buf);
  /* To be safe, we allocate a large enough buffer */
  temp_buf =(char *)malloc(sizeof(char)*(stat_buf.st_size+1));
  item_read = 0;
  do {
    if (fscanf(fp,"%d%s", &(words[item_read].category),
	       temp_buf)==2) {
      words[item_read].word =
	(char *)malloc(sizeof(char)*(strlen(temp_buf)+1));
      strcpy(words[item_read].word, temp_buf);
      item_read++;
      if (item_read >= nitem) break;
    }
    else {
      break;
    }
  } while(1);
  fclose(fp);
  free(temp_buf);
  return item_read;
}