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/* Functions for dealing with elt unions
Copyright (C) 1993 Free Software Foundation, Inc.
Written by: R. Andrew McCallum <mccallum@cs.rochester.edu>
Dept. of Computer Science, U. of Rochester, Rochester, NY 14627
This file is part of the GNU Objective-C Collection library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <coll/eltfuncs.h>
#include <objc/Object.h>
#include <objc/objc-api.h>
//#include <objc/hash.h>
//#include <coll/collstd.h> /* for -compare: */
/* Is there a better (shorter) way to specify all this junk? */
unsigned int
elt_hash_int (elt key)
{
return (key.int_u);
}
int
elt_compare_ints (elt k1, elt k2)
{
if (k1.int_u == k2.int_u)
return 0;
else if (k1.int_u > k2.int_u)
return 1;
else
return -1;
}
unsigned int
elt_hash_unsigned_int (elt key)
{
return (key.unsigned_int_u);
}
int
elt_compare_unsigned_ints (elt k1, elt k2)
{
if (k1.unsigned_int_u == k2.unsigned_int_u)
return 0;
else if (k1.unsigned_int_u > k2.unsigned_int_u)
return 1;
else
return -1;
}
unsigned int
elt_hash_long_int (elt key)
{
return ((unsigned int)key.long_int_u);
}
int
elt_compare_long_ints (elt k1, elt k2)
{
if (k1.long_int_u == k2.long_int_u)
return 0;
else if (k1.long_int_u > k2.long_int_u)
return 1;
else
return -1;
}
unsigned int
elt_hash_unsigned_long_int (elt key)
{
return ((unsigned int)key.unsigned_long_int_u);
}
int
elt_compare_unsigned_long_ints (elt k1, elt k2)
{
if (k1.unsigned_long_int_u == k2.unsigned_long_int_u)
return 0;
else if (k1.unsigned_long_int_u > k2.unsigned_long_int_u)
return 1;
else
return -1;
}
unsigned int
elt_hash_char (elt key)
{
return ((unsigned int)key.char_u);
}
int
elt_compare_chars (elt k1, elt k2)
{
if (k1.char_u == k2.char_u)
return 0;
else if (k1.char_u > k2.char_u)
return 1;
else
return -1;
}
unsigned int
elt_hash_unsigned_char (elt key)
{
return ((unsigned int)key.unsigned_char_u);
}
int
elt_compare_unsigned_chars (elt k1, elt k2)
{
if (k1.unsigned_char_u == k2.unsigned_char_u)
return 0;
else if (k1.unsigned_char_u > k2.unsigned_char_u)
return 1;
else
return -1;
}
unsigned int
elt_hash_short (elt key)
{
return ((unsigned int)key.short_int_u);
}
int
elt_compare_shorts (elt k1, elt k2)
{
if (k1.short_int_u == k2.short_int_u)
return 0;
else if (k1.short_int_u > k2.short_int_u)
return 1;
else
return -1;
}
unsigned int
elt_hash_unsigned_short (elt key)
{
return ((unsigned int)key.unsigned_short_int_u);
}
int
elt_compare_unsigned_shorts (elt k1, elt k2)
{
if (k1.unsigned_short_int_u == k2.unsigned_short_int_u)
return 0;
else if (k1.unsigned_short_int_u > k2.unsigned_short_int_u)
return 1;
else
return -1;
}
unsigned int
elt_hash_float (elt key)
{
/* There must be a better hash function for floats than this */
return ((unsigned int)key.float_u);
}
int
elt_compare_floats (elt k1, elt k2)
{
float diff = k1.float_u - k2.float_u;
if (diff == 0)
return 0;
else if (diff > 0)
return 1;
else
return -1;
}
#if (ELT_INCLUDES_DOUBLE)
unsigned int
elt_hash_double (elt key)
{
/* There must be a better hash function for doubles than this.
Fix this nonsense: */
return ((unsigned int)key.double_u);
}
int
elt_compare_doubles (elt k1, elt k2)
{
double diff = k1.double_u - k2.double_u;
if (diff == 0)
return 0;
else if (diff > 0)
return 1;
else
return -1;
}
#endif
int
elt_compare_strings (elt k1, elt k2)
{
return strcmp (k1.char_ptr_u, k2.char_ptr_u);
}
unsigned int
elt_hash_string (elt key)
{
unsigned int ret = 0;
unsigned int ctr = 0;
while (*key.char_ptr_u) {
ret ^= *key.char_ptr_u++ << ctr;
ctr = (ctr + 1) % sizeof (void *);
}
return ret;
}
int
elt_compare_void_ptrs (elt k1, elt k2)
{
if (k1.void_ptr_u == k2.void_ptr_u)
return 0;
else if (k1.void_ptr_u > k2.void_ptr_u)
return 1;
else
return -1;
}
unsigned int
elt_hash_void_ptr (elt key)
{
return ((unsigned)key.void_ptr_u) / sizeof(void *);
}
unsigned int
elt_hash_object (elt key)
{
return [key.id_u hash];
}
int
elt_compare_objects (elt k1, elt k2)
{
return [k1.id_u compare:k2.id_u];
}
int
(*(elt_get_comparison_function(const char *encoding)))(elt,elt)
{
switch (*encoding)
{
case _C_CHARPTR:
case _C_ATOM:
return elt_compare_strings;
case _C_ID:
case _C_CLASS: /* isEqual: on classes works well? */
return elt_compare_objects;
case _C_PTR:
return elt_compare_void_ptrs;
case _C_INT:
return elt_compare_ints;
case _C_SEL: /* is this where this belongs? */
case _C_UINT:
return elt_compare_unsigned_ints;
case _C_FLT:
return elt_compare_floats;
case _C_LNG:
return elt_compare_long_ints;
case _C_ULNG:
return elt_compare_unsigned_long_ints;
case _C_CHR:
return elt_compare_chars;
case _C_UCHR:
return elt_compare_unsigned_chars;
case _C_SHT:
return elt_compare_shorts;
case _C_USHT:
return elt_compare_unsigned_shorts;
default :
return 0;
}
}
unsigned int
(*(elt_get_hash_function(const char *encoding)))(elt)
{
switch (*encoding)
{
case _C_CHARPTR:
case _C_ATOM:
return elt_hash_string;
case _C_ID:
case _C_CLASS: /* I can send classes isEqual:? */
return elt_hash_object;
case _C_PTR:
return elt_hash_void_ptr;
case _C_INT:
return elt_hash_int;
case _C_SEL: /* is this where this belongs? */
case _C_UINT:
return elt_hash_unsigned_int;
case _C_FLT:
return elt_hash_float;
case _C_LNG:
return elt_hash_long_int;
case _C_ULNG:
return elt_hash_unsigned_long_int;
case _C_CHR:
return elt_hash_char;
case _C_UCHR:
return elt_hash_unsigned_char;
case _C_SHT:
return elt_hash_short;
case _C_USHT:
return elt_hash_unsigned_short;
default :
return 0;
}
}
static cache_ptr __comp_func_hashtable = 0;
#define INIT_COMP_FUNC_HASHTABLE_SIZE 32
static inline void
__init_comp_func_hashtable()
{
__comp_func_hashtable = hash_new(INIT_COMP_FUNC_HASHTABLE_SIZE,
(hash_func_type)hash_ptr,
(compare_func_type)compare_ptrs);
hash_add(&__comp_func_hashtable,
(void*)elt_compare_ints,
@encode(int));
hash_add(&__comp_func_hashtable,
(void*)elt_compare_unsigned_ints,
@encode(unsigned int));
hash_add(&__comp_func_hashtable,
(void*)elt_compare_long_ints,
@encode(long int));
hash_add(&__comp_func_hashtable,
(void*)elt_compare_unsigned_long_ints,
@encode(unsigned long int));
hash_add(&__comp_func_hashtable,
(void*)elt_compare_chars,
@encode(char));
hash_add(&__comp_func_hashtable,
(void*)elt_compare_unsigned_chars,
@encode(unsigned char));
hash_add(&__comp_func_hashtable,
(void*)elt_compare_shorts,
@encode(short));
hash_add(&__comp_func_hashtable,
(void*)elt_compare_unsigned_shorts,
@encode(unsigned short));
hash_add(&__comp_func_hashtable,
(void*)elt_compare_floats,
@encode(float));
#if (ELT_INCLUDES_DOUBLE)
hash_add(&__comp_func_hashtable,
(void*)elt_compare_doubles,
@encode(double));
#endif
hash_add(&__comp_func_hashtable,
(void*)elt_compare_strings,
@encode(char*));
hash_add(&__comp_func_hashtable,
(void*)elt_compare_void_ptrs,
@encode(void*));
hash_add(&__comp_func_hashtable,
(void*)elt_compare_objects,
@encode(id));
}
const char *
elt_get_encoding(int(*comparison_function)(elt,elt))
{
if (!__comp_func_hashtable)
__init_comp_func_hashtable();
return (const char *)
hash_value_for_key(__comp_func_hashtable,
(void*)comparison_function);
}
/* Is this really necessary? Can I count on element members always
starting at the beginning? */
extern void *elt_get_ptr_to_member(const char *encoding, elt *anElement)
{
switch (*encoding)
{
case _C_CHARPTR:
case _C_ATOM:
return &(anElement->char_ptr_u);
case _C_ID:
case _C_CLASS:
return &(anElement->id_u);
case _C_PTR:
return &(anElement->void_ptr_u);
case _C_SEL:
return &(anElement->SEL_u);
case _C_CHR:
return &(anElement->char_u);
case _C_UCHR:
return &(anElement->unsigned_char_u);
case _C_SHT:
return &(anElement->short_int_u);
case _C_USHT:
return &(anElement->unsigned_short_int_u);
break;
case _C_INT:
return &(anElement->int_u);
case _C_UINT:
return &(anElement->unsigned_int_u);
case _C_LNG:
return &(anElement->long_int_u);
case _C_ULNG:
return &(anElement->unsigned_long_int_u);
case _C_FLT:
return &(anElement->float_u);
#if (ELT_INCLUDES_DOUBLE)
case _C_DBL:
return &(anElement->double_u);
#endif
default :
return 0;
}
}
// This printing stuff will change when we get Stream objects;
void
elt_fprintf_elt(FILE *fp, const char *encoding, elt anElement)
{
switch (*encoding)
{
case _C_CHARPTR:
case _C_ATOM:
fprintf(fp, "\"%s\"", anElement.char_ptr_u);
break;
case _C_ID:
case _C_CLASS:
fprintf(fp, "%s:0x%x", [anElement.id_u name], anElement.unsigned_int_u);
break;
case _C_PTR:
fprintf(fp, "0x%x", anElement.unsigned_int_u);
break;
case _C_SEL:
fprintf(fp, "%s", sel_get_name(anElement.SEL_u));
break;
case _C_CHR:
fprintf(fp, "%c", anElement.char_u);
break;
case _C_UCHR:
fprintf(fp, "%c", anElement.unsigned_char_u);
break;
case _C_SHT:
fprintf(fp, "%d", anElement.short_int_u);
break;
case _C_USHT:
fprintf(fp, "%d", anElement.unsigned_short_int_u);
break;
case _C_INT:
fprintf(fp, "%d", anElement.int_u);
break;
case _C_UINT:
fprintf(fp, "%d", anElement.unsigned_int_u);
break;
case _C_LNG:
fprintf(fp, "%d", anElement.long_int_u);
break;
case _C_ULNG:
fprintf(fp, "%d", anElement.unsigned_long_int_u);
break;
case _C_FLT:
fprintf(fp, "%f", anElement.float_u);
break;
#if (ELT_INCLUDES_DOUBLE)
case _C_DBL:
fprintf(fp, "%lf", anElement.double_u);
break;
#endif
default :
fprintf(fp, "unknown?");
}
}
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