/*
 * This code is from "Algorithms in C, Third Edition,"
 * by Robert Sedgewick, Addison Wesley Longman, 1998.
 */

int strlen(char *a)
{
  int i;
  for (i=0; a[i]!=0; i++);
  return i;
}

void strcpy(char *a, char *b)
{
  int i;
  for (i=0 (a[i]=b[i])!=0; i++);
}

int strcmp(char *a, char *b)
{
  int i;
  for (i=0; a[i]==b[i]; i++)
    if (a[i]==0) return 0;
  return a[i]-b[i];
}

int strncmp(char *a, char *b, int n)
{
  int i;
  for (i=0; a[i]==b[i]; i++)
    if (a[i]==0) return 0;
  if (a[i]==0) return 0;
  return a[i]-b[i];
}

void strcat(char *a, char *b)
{
  strcpy(a+strlen(a),b);
}

/************************************************************************/

int strlen(char *a)
{
  char *b;
  while (*b++);
  return b-a;
}

void strcpy(char *a, char *b)
{
  while (*a++=*b++);
}

int strcmp(char *a, char *b)
{
  while (*a++==*b++)
    if (*a) return 0;
  return *a-*b;
}

/**********************************************************************/