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/* Support for using a string as a hash key.
Copyright (C) 2006-2025 Free Software Foundation, Inc.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
This file is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "hashkey-string.h"
#include <limits.h>
#include <string.h>
bool
hashkey_string_equals (const void *x1, const void *x2)
{
const char *s1 = (const char *) x1;
const char *s2 = (const char *) x2;
return strcmp (s1, s2) == 0;
}
#define SIZE_BITS (sizeof (size_t) * CHAR_BIT)
/* A hash function for NUL-terminated 'const char *' strings using
the method described by Bruno Haible.
See https://www.haible.de/bruno/hashfunc.html. */
size_t
hashkey_string_hash (const void *x)
{
const char *s = (const char *) x;
size_t h = 0;
for (; *s; s++)
h = *s + ((h << 9) | (h >> (SIZE_BITS - 9)));
return h;
}
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