util.c

/*
 * util.c - commonly used utility functions.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "util.h"
void *checked_malloc(int len)
{void *p = malloc(len);
 if (!p) {
    fprintf(stderr,"\nRan out of memory!\n");
    exit(1);
 }
 return p;
}

string String(char *s)
{string p = checked_malloc(strlen(s)+1);
 strcpy(p,s);
 return p;
}

U_boolList U_BoolList(bool head, U_boolList tail)
{ U_boolList list = checked_malloc(sizeof(*list));
  list->head = head;
  list->tail = tail;
  return list;
}
U_boolList U_BoolList_append(U_boolList list,bool append)
{
  if (!list)
    return U_BoolList(append,NULL);
  U_boolList list1 = list;
  while (list->tail){
    list = list->tail;
  }
  list->tail = U_BoolList(append,NULL);
  return list1;
}