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67476f08fc
git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@909 72102866-910b-0410-8b05-ffd578937521
129 lines
3.1 KiB
C
129 lines
3.1 KiB
C
/* Callbacks for strings of `char'.
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* Copyright (C) 1996 Free Software Foundation, Inc.
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*
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* Author: Albin L. Jones <Albin.L.Jones@Dartmouth.EDU>
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* Created: Sat Feb 10 22:04:38 EST 1996
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* Updated: Sun Feb 11 01:40:09 EST 1996
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* Serial: 96.02.11.05
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*
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* This file is part of the GNU Objective C Class Library.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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/**** Included Headers *******************************************************/
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#include <stdlib.h>
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#include <objects/callbacks.h>
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/**** Type, Constant, and Macro Definitions **********************************/
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objects_callbacks_t objects_callbacks_for_char_p =
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{
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(objects_hash_func_t) objects_char_p_hash,
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(objects_compare_func_t) objects_char_p_compare,
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(objects_is_equal_func_t) objects_char_p_is_equal,
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(objects_retain_func_t) objects_char_p_retain,
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(objects_release_func_t) objects_char_p_release,
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(objects_describe_func_t) objects_char_p_describe,
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0
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};
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/**** Function Implementations ***********************************************/
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size_t
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objects_char_p_hash(void *cptr)
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{
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register char *s = (char *) cptr;
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register size_t h = 0;
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register size_t c = 0;
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while (*s != '\0')
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h ^= *(s++) << (c++);
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return h;
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}
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int
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objects_char_p_compare(void *cptr, void *dptr)
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{
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register char *s = (char *) cptr;
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register char *t = (char *) dptr;
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if (s == t)
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{
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return 0;
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}
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else
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{
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register char c;
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register char d;
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while ((c = *(s++)) == (d = *(s++)))
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if (c == '\0')
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return 0;
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return (c - d);
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}
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}
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/* Determines whether or not CPTR is the same (`NUL'-terminated)
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* character string as DPTR. Returns true if CPTR and DPTR are the same,
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* and false otherwise. Note that we are performing no
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* internationalization here. CPTR and DPTR are taken to be C strings
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* in the default (seven or) eight bit character encoding. */
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int
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objects_char_p_is_equal(register void *cptr, register void *dptr)
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{
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register char *s = (char *) cptr;
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register char *t = (char *) dptr;
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if (s == t)
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{
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return 1;
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}
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else
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{
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register char c;
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register char d;
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while ((c = *(s++)) == (d = *(t++)))
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if (c == '\0')
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return 1;
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return 0;
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}
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}
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void *
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objects_char_p_retain(void *cptr)
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{
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return cptr;
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}
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void
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objects_char_p_release(void *cptr)
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{
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return;
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}
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void *
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objects_char_p_describe(void *cptr)
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{
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/* FIXME: Code this. But first, figure out what it should do, OK? */
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return 0;
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}
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