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950cc72b | 1 | /* Copyright (C) 1995,1996,1997, 2000 Free Software Foundation, Inc. |
0f2d19dd JB |
2 | * |
3 | * This program is free software; you can redistribute it and/or modify | |
4 | * it under the terms of the GNU General Public License as published by | |
5 | * the Free Software Foundation; either version 2, or (at your option) | |
6 | * any later version. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this software; see the file COPYING. If not, write to | |
82892bed JB |
15 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
16 | * Boston, MA 02111-1307 USA | |
0f2d19dd JB |
17 | * |
18 | * As a special exception, the Free Software Foundation gives permission | |
19 | * for additional uses of the text contained in its release of GUILE. | |
20 | * | |
21 | * The exception is that, if you link the GUILE library with other files | |
22 | * to produce an executable, this does not by itself cause the | |
23 | * resulting executable to be covered by the GNU General Public License. | |
24 | * Your use of that executable is in no way restricted on account of | |
25 | * linking the GUILE library code into it. | |
26 | * | |
27 | * This exception does not however invalidate any other reasons why | |
28 | * the executable file might be covered by the GNU General Public License. | |
29 | * | |
30 | * This exception applies only to the code released by the | |
31 | * Free Software Foundation under the name GUILE. If you copy | |
32 | * code from other Free Software Foundation releases into a copy of | |
33 | * GUILE, as the General Public License permits, the exception does | |
34 | * not apply to the code that you add in this way. To avoid misleading | |
35 | * anyone as to the status of such modified files, you must delete | |
36 | * this exception notice from them. | |
37 | * | |
38 | * If you write modifications of your own for GUILE, it is your choice | |
39 | * whether to permit this exception to apply to your modifications. | |
82892bed | 40 | * If you do not wish that, delete this exception notice. */ |
1bbd0b84 GB |
41 | |
42 | /* Software engineering face-lift by Greg J. Badros, 11-Dec-1999, | |
43 | gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */ | |
44 | ||
0f2d19dd JB |
45 | \f |
46 | ||
47 | #include <stdio.h> | |
a0599745 MD |
48 | #include "libguile/_scm.h" |
49 | #include "libguile/chars.h" | |
50 | #include "libguile/ports.h" | |
51 | #include "libguile/vectors.h" | |
0f2d19dd | 52 | |
a0599745 MD |
53 | #include "libguile/validate.h" |
54 | #include "libguile/hash.h" | |
0f2d19dd JB |
55 | \f |
56 | ||
57 | #ifndef floor | |
58 | extern double floor(); | |
59 | #endif | |
60 | ||
1cc91f1b | 61 | |
dba97178 DH |
62 | /* Dirk:FIXME:: why downcase for characters? (2x: scm_hasher, scm_ihashv) */ |
63 | /* Dirk:FIXME:: scm_hasher could be made static. */ | |
64 | ||
65 | ||
0f2d19dd | 66 | unsigned long |
1bbd0b84 | 67 | scm_hasher(SCM obj, unsigned long n, scm_sizet d) |
0f2d19dd | 68 | { |
dba97178 DH |
69 | switch (SCM_ITAG3 (obj)) { |
70 | case scm_tc3_int_1: | |
71 | case scm_tc3_int_2: | |
94a5efac | 72 | return SCM_INUM(obj) % n; /* SCM_INUMP(obj) */ |
dba97178 DH |
73 | case scm_tc3_imm24: |
74 | if (SCM_CHARP(obj)) | |
7866a09b | 75 | return (unsigned)(scm_downcase(SCM_CHAR(obj))) % n; |
dba97178 | 76 | switch (SCM_UNPACK (obj)) { |
0f2d19dd | 77 | #ifndef SICP |
dba97178 | 78 | case SCM_EOL: |
94a5efac GB |
79 | d = 256; |
80 | break; | |
0f2d19dd | 81 | #endif |
dba97178 | 82 | case SCM_BOOL_T: |
94a5efac GB |
83 | d = 257; |
84 | break; | |
dba97178 | 85 | case SCM_BOOL_F: |
94a5efac GB |
86 | d = 258; |
87 | break; | |
dba97178 | 88 | case SCM_EOF_VAL: |
94a5efac GB |
89 | d = 259; |
90 | break; | |
91 | default: | |
92 | d = 263; /* perhaps should be error */ | |
0f2d19dd JB |
93 | } |
94 | return d % n; | |
94a5efac GB |
95 | default: |
96 | return 263 % n; /* perhaps should be error */ | |
dba97178 | 97 | case scm_tc3_cons: |
0f2d19dd | 98 | switch SCM_TYP7(obj) { |
94a5efac GB |
99 | default: |
100 | return 263 % n; | |
0f2d19dd JB |
101 | case scm_tc7_smob: |
102 | switch SCM_TYP16(obj) { | |
950cc72b | 103 | case scm_tc16_big: |
94a5efac GB |
104 | return SCM_INUM(scm_modulo(obj, SCM_MAKINUM(n))); |
105 | default: | |
106 | return 263 % n; | |
950cc72b MD |
107 | case scm_tc16_real: |
108 | { | |
0f2d19dd JB |
109 | double r = SCM_REALPART(obj); |
110 | if (floor(r)==r) { | |
111 | obj = scm_inexact_to_exact (obj); | |
112 | if SCM_IMP(obj) return SCM_INUM(obj) % n; | |
94a5efac | 113 | return SCM_INUM(scm_modulo(obj, SCM_MAKINUM(n))); |
0f2d19dd JB |
114 | } |
115 | } | |
950cc72b | 116 | case scm_tc16_complex: |
0f2d19dd | 117 | obj = scm_number_to_string(obj, SCM_MAKINUM(10)); |
0f2d19dd JB |
118 | } |
119 | case scm_tcs_symbols: | |
120 | case scm_tc7_string: | |
0f2d19dd | 121 | case scm_tc7_substring: |
0f2d19dd JB |
122 | return scm_strhash(SCM_ROUCHARS(obj), (scm_sizet) SCM_ROLENGTH(obj), n); |
123 | case scm_tc7_wvect: | |
124 | case scm_tc7_vector: | |
125 | { | |
126 | scm_sizet len = SCM_LENGTH(obj); | |
127 | SCM *data = SCM_VELTS(obj); | |
128 | if (len>5) | |
129 | { | |
130 | scm_sizet i = d/2; | |
131 | unsigned long h = 1; | |
132 | while (i--) h = ((h<<8) + (scm_hasher(data[h % len], n, 2))) % n; | |
133 | return h; | |
134 | } | |
135 | else | |
136 | { | |
137 | scm_sizet i = len; | |
138 | unsigned long h = (n)-1; | |
139 | while (i--) h = ((h<<8) + (scm_hasher(data[i], n, d/len))) % n; | |
140 | return h; | |
141 | } | |
142 | } | |
94a5efac GB |
143 | case scm_tcs_cons_imcar: |
144 | case scm_tcs_cons_nimcar: | |
0f2d19dd JB |
145 | if (d) return (scm_hasher(SCM_CAR(obj), n, d/2)+scm_hasher(SCM_CDR(obj), n, d/2)) % n; |
146 | else return 1; | |
147 | case scm_tc7_port: | |
f1267706 | 148 | return ((SCM_RDNG & SCM_UNPACK_CAR(obj)) ? 260 : 261) % n; |
94a5efac GB |
149 | case scm_tcs_closures: |
150 | case scm_tc7_contin: | |
151 | case scm_tcs_subrs: | |
0f2d19dd JB |
152 | return 262 % n; |
153 | } | |
154 | } | |
155 | } | |
156 | ||
157 | ||
158 | \f | |
159 | ||
1cc91f1b | 160 | |
0f2d19dd | 161 | unsigned int |
1bbd0b84 | 162 | scm_ihashq (SCM obj, unsigned int n) |
0f2d19dd | 163 | { |
54778cd3 | 164 | return (SCM_UNPACK (obj) >> 1) % n; |
0f2d19dd JB |
165 | } |
166 | ||
167 | ||
3b3b36dd | 168 | SCM_DEFINE (scm_hashq, "hashq", 2, 0, 0, |
94a5efac GB |
169 | (SCM key, SCM size), |
170 | "Determine a hash value for KEY that is suitable for lookups in\n" | |
171 | "a hashtable of size SIZE, where eq? is used as the equality\n" | |
172 | "predicate. The function returns an integer in the range 0 to\n" | |
173 | "SIZE - 1. NOTE that `hashq' may use internal addresses.\n" | |
174 | "Thus two calls to hashq where the keys are eq? are not\n" | |
175 | "guaranteed to deliver the same value if the key object gets\n" | |
176 | "garbage collected in between. This can happen, for example\n" | |
3fcc798d | 177 | "with symbols: (hashq 'foo n) (gc) (hashq 'foo n) may produce two\n" |
10d7b665 | 178 | "different values, since 'foo will be garbage collected.") |
1bbd0b84 | 179 | #define FUNC_NAME s_scm_hashq |
0f2d19dd | 180 | { |
94a5efac GB |
181 | SCM_VALIDATE_INUM_MIN (2, size, 0); |
182 | return SCM_MAKINUM (scm_ihashq (key, SCM_INUM (size))); | |
0f2d19dd | 183 | } |
1bbd0b84 | 184 | #undef FUNC_NAME |
0f2d19dd JB |
185 | |
186 | ||
187 | \f | |
188 | ||
1cc91f1b | 189 | |
0f2d19dd | 190 | unsigned int |
1bbd0b84 | 191 | scm_ihashv (SCM obj, unsigned int n) |
0f2d19dd | 192 | { |
7866a09b GB |
193 | if (SCM_CHARP(obj)) |
194 | return ((unsigned int)(scm_downcase(SCM_CHAR(obj)))) % n; /* downcase!?!! */ | |
0f2d19dd | 195 | |
0c95b57d | 196 | if (SCM_NUMP(obj)) |
0f2d19dd JB |
197 | return (unsigned int) scm_hasher(obj, n, 10); |
198 | else | |
54778cd3 | 199 | return SCM_UNPACK (obj) % n; |
0f2d19dd JB |
200 | } |
201 | ||
202 | ||
3b3b36dd | 203 | SCM_DEFINE (scm_hashv, "hashv", 2, 0, 0, |
94a5efac GB |
204 | (SCM key, SCM size), |
205 | "Determine a hash value for KEY that is suitable for lookups in\n" | |
206 | "a hashtable of size SIZE, where eqv? is used as the equality\n" | |
207 | "predicate. The function returns an integer in the range 0 to\n" | |
208 | "SIZE - 1. NOTE that (hashv key) may use internal addresses.\n" | |
209 | "Thus two calls to hashv where the keys are eqv? are not\n" | |
210 | "guaranteed to deliver the same value if the key object gets\n" | |
211 | "garbage collected in between. This can happen, for example\n" | |
3fcc798d | 212 | "with symbols: (hashv 'foo n) (gc) (hashv 'foo n) may produce two\n" |
10d7b665 | 213 | "different values, since 'foo will be garbage collected.") |
1bbd0b84 | 214 | #define FUNC_NAME s_scm_hashv |
0f2d19dd | 215 | { |
94a5efac GB |
216 | SCM_VALIDATE_INUM_MIN (2, size, 0); |
217 | return SCM_MAKINUM (scm_ihashv (key, SCM_INUM (size))); | |
0f2d19dd | 218 | } |
1bbd0b84 | 219 | #undef FUNC_NAME |
0f2d19dd JB |
220 | |
221 | ||
222 | \f | |
223 | ||
1cc91f1b | 224 | |
0f2d19dd | 225 | unsigned int |
1bbd0b84 | 226 | scm_ihash (SCM obj, unsigned int n) |
0f2d19dd JB |
227 | { |
228 | return (unsigned int)scm_hasher (obj, n, 10); | |
229 | } | |
230 | ||
3b3b36dd | 231 | SCM_DEFINE (scm_hash, "hash", 2, 0, 0, |
94a5efac GB |
232 | (SCM key, SCM size), |
233 | "Determine a hash value for KEY that is suitable for lookups in\n" | |
234 | "a hashtable of size SIZE, where equal? is used as the equality\n" | |
235 | "predicate. The function returns an integer in the range 0 to\n" | |
236 | "SIZE - 1.") | |
1bbd0b84 | 237 | #define FUNC_NAME s_scm_hash |
0f2d19dd | 238 | { |
94a5efac GB |
239 | SCM_VALIDATE_INUM_MIN (2, size, 0); |
240 | return SCM_MAKINUM (scm_ihash (key, SCM_INUM (size))); | |
0f2d19dd | 241 | } |
1bbd0b84 | 242 | #undef FUNC_NAME |
0f2d19dd JB |
243 | |
244 | ||
245 | \f | |
246 | ||
1cc91f1b | 247 | |
0f2d19dd JB |
248 | void |
249 | scm_init_hash () | |
0f2d19dd | 250 | { |
a0599745 | 251 | #include "libguile/hash.x" |
0f2d19dd JB |
252 | } |
253 | ||
89e00824 ML |
254 | |
255 | /* | |
256 | Local Variables: | |
257 | c-file-style: "gnu" | |
258 | End: | |
259 | */ |