-/* Copyright (C) 1995,1996,1997 Free Software Foundation, Inc.
+/* Copyright (C) 1995,1996,1997, 2000 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
#include <stdio.h>
#include "_scm.h"
#include "chars.h"
+#include "ports.h"
+#include "vectors.h"
-#include "scm_validate.h"
+#include "validate.h"
#include "hash.h"
\f
scm_hasher(SCM obj, unsigned long n, scm_sizet d)
{
switch (7 & (int) obj) {
- case 2: case 6: /* SCM_INUMP(obj) */
- return SCM_INUM(obj) % n;
+ case 2:
+ case 6:
+ return SCM_INUM(obj) % n; /* SCM_INUMP(obj) */
case 4:
if SCM_CHARP(obj)
return (unsigned)(scm_downcase(SCM_CHAR(obj))) % n;
switch ((int) obj) {
#ifndef SICP
- case (int) SCM_EOL: d = 256; break;
+ case (int) SCM_EOL:
+ d = 256;
+ break;
#endif
- case (int) SCM_BOOL_T: d = 257; break;
- case (int) SCM_BOOL_F: d = 258; break;
- case (int) SCM_EOF_VAL: d = 259; break;
- default: d = 263; /* perhaps should be error */
+ case (int) SCM_BOOL_T:
+ d = 257;
+ break;
+ case (int) SCM_BOOL_F:
+ d = 258;
+ break;
+ case (int) SCM_EOF_VAL:
+ d = 259;
+ break;
+ default:
+ d = 263; /* perhaps should be error */
}
return d % n;
- default: return 263 % n; /* perhaps should be error */
+ default:
+ return 263 % n; /* perhaps should be error */
case 0:
switch SCM_TYP7(obj) {
- default: return 263 % n;
+ default:
+ return 263 % n;
case scm_tc7_smob:
switch SCM_TYP16(obj) {
- case scm_tcs_bignums:
- bighash: return SCM_INUM(scm_modulo(obj, SCM_MAKINUM(n)));
- default: return 263 % n;
-#ifdef SCM_FLOATS
- case scm_tc16_flo:
- if SCM_REALP(obj) {
+ case scm_tc16_big:
+ return SCM_INUM(scm_modulo(obj, SCM_MAKINUM(n)));
+ default:
+ return 263 % n;
+ case scm_tc16_real:
+ {
double r = SCM_REALPART(obj);
if (floor(r)==r) {
obj = scm_inexact_to_exact (obj);
if SCM_IMP(obj) return SCM_INUM(obj) % n;
- goto bighash;
+ return SCM_INUM(scm_modulo(obj, SCM_MAKINUM(n)));
}
}
+ case scm_tc16_complex:
obj = scm_number_to_string(obj, SCM_MAKINUM(10));
-#endif
}
case scm_tcs_symbols:
case scm_tc7_string:
return h;
}
}
- case scm_tcs_cons_imcar: case scm_tcs_cons_nimcar:
+ case scm_tcs_cons_imcar:
+ case scm_tcs_cons_nimcar:
if (d) return (scm_hasher(SCM_CAR(obj), n, d/2)+scm_hasher(SCM_CDR(obj), n, d/2)) % n;
else return 1;
case scm_tc7_port:
- return ((SCM_RDNG & SCM_CAR(obj)) ? 260 : 261) % n;
- case scm_tcs_closures: case scm_tc7_contin: case scm_tcs_subrs:
+ return ((SCM_RDNG & SCM_UNPACK_CAR(obj)) ? 260 : 261) % n;
+ case scm_tcs_closures:
+ case scm_tc7_contin:
+ case scm_tcs_subrs:
return 262 % n;
}
}
SCM_DEFINE (scm_hashq, "hashq", 2, 0, 0,
- (SCM obj, SCM n),
- "@deffnx primitive hashv key size\n"
- "@deffnx primitive hash key size\n"
- "Default hash functions for Guile hash tables. @var{key} is the\n"
- "object to be hashed, and @var{size} is the size of the target hash\n"
- "table. Each function returns an integer in the range 0 to\n"
- "@var{size}-1.")
+ (SCM key, SCM size),
+ "Determine a hash value for KEY that is suitable for lookups in\n"
+ "a hashtable of size SIZE, where eq? is used as the equality\n"
+ "predicate. The function returns an integer in the range 0 to\n"
+ "SIZE - 1. NOTE that `hashq' may use internal addresses.\n"
+ "Thus two calls to hashq where the keys are eq? are not\n"
+ "guaranteed to deliver the same value if the key object gets\n"
+ "garbage collected in between. This can happen, for example\n"
+ "with symbols: (hashq 'foo n) (gc) (hashq 'foo n) may produce two\n"
+ "different values, since 'foo will be garbage collected.")
#define FUNC_NAME s_scm_hashq
{
- SCM_VALIDATE_INUM_MIN (2,n,0);
- return SCM_MAKINUM(scm_ihashq (obj, SCM_INUM (n)));
+ SCM_VALIDATE_INUM_MIN (2, size, 0);
+ return SCM_MAKINUM (scm_ihashq (key, SCM_INUM (size)));
}
#undef FUNC_NAME
SCM_DEFINE (scm_hashv, "hashv", 2, 0, 0,
- (SCM obj, SCM n),
- "")
+ (SCM key, SCM size),
+ "Determine a hash value for KEY that is suitable for lookups in\n"
+ "a hashtable of size SIZE, where eqv? is used as the equality\n"
+ "predicate. The function returns an integer in the range 0 to\n"
+ "SIZE - 1. NOTE that (hashv key) may use internal addresses.\n"
+ "Thus two calls to hashv where the keys are eqv? are not\n"
+ "guaranteed to deliver the same value if the key object gets\n"
+ "garbage collected in between. This can happen, for example\n"
+ "with symbols: (hashv 'foo n) (gc) (hashv 'foo n) may produce two\n"
+ "different values, since 'foo will be garbage collected.")
#define FUNC_NAME s_scm_hashv
{
- SCM_VALIDATE_INUM_MIN (2,n,0);
- return SCM_MAKINUM(scm_ihashv (obj, SCM_INUM (n)));
+ SCM_VALIDATE_INUM_MIN (2, size, 0);
+ return SCM_MAKINUM (scm_ihashv (key, SCM_INUM (size)));
}
#undef FUNC_NAME
}
SCM_DEFINE (scm_hash, "hash", 2, 0, 0,
- (SCM obj, SCM n),
- "")
+ (SCM key, SCM size),
+ "Determine a hash value for KEY that is suitable for lookups in\n"
+ "a hashtable of size SIZE, where equal? is used as the equality\n"
+ "predicate. The function returns an integer in the range 0 to\n"
+ "SIZE - 1.")
#define FUNC_NAME s_scm_hash
{
- SCM_VALIDATE_INUM_MIN (2,n,0);
- return SCM_MAKINUM(scm_ihash(obj, SCM_INUM(n)));
+ SCM_VALIDATE_INUM_MIN (2, size, 0);
+ return SCM_MAKINUM (scm_ihash (key, SCM_INUM (size)));
}
#undef FUNC_NAME
#include "hash.x"
}
+
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/
HCoop / bpt / guile.git / blobdiff