C++ (Cpp) HASH_ONE_CHAR Beispiele

Beispiel #1

Datei: hash.c Projekt: Distrotech/gnulib

size_t
hash_string (const char *string, size_t n_buckets)
{
# define HASH_ONE_CHAR(Value, Byte) \
  ((Byte) + rotl_sz (Value, 7))

  size_t value = 0;
  unsigned char ch;

  for (; (ch = *string); string++)
    value = HASH_ONE_CHAR (value, ch);
  return value % n_buckets;

# undef HASH_ONE_CHAR
}

Beispiel #2

Datei: hash.c Projekt: aosm/gnutar

size_t
hash_string (const char *string, size_t n_buckets)
{
# define ROTATE_LEFT(Value, Shift) \
  ((Value) << (Shift) | (Value) >> ((sizeof (size_t) * CHAR_BIT) - (Shift)))
# define HASH_ONE_CHAR(Value, Byte) \
  ((Byte) + ROTATE_LEFT (Value, 7))

  size_t value = 0;
  unsigned char ch;

  for (; (ch = *string); string++)
    value = HASH_ONE_CHAR (value, ch);
  return value % n_buckets;

# undef ROTATE_LEFT
# undef HASH_ONE_CHAR
}

Beispiel #3

Datei: hash.c Projekt: redwinner/unxutils

unsigned
hash_string (const char *string, unsigned n_buckets)
{
# ifndef CHAR_BIT
#  define CHAR_BIT 8
# endif
# define ROTATE_LEFT(Value, Shift) \
  ((Value) << (Shift) | (Value) >> ((sizeof (unsigned) * CHAR_BIT) - (Shift)))
# define HASH_ONE_CHAR(Value, Byte) \
  ((Byte) + ROTATE_LEFT (Value, 7))

  unsigned value = 0;

  for (; *string; string++)
    value = HASH_ONE_CHAR (value, *(const unsigned char *) string);
  return value % n_buckets;

# undef ROTATE_LEFT
# undef HASH_ONE_CHAR
}