Commit | Line | Data |
---|---|---|
7dc6e754 | 1 | /* Copyright (C) 1995,1996,1997 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> | |
48 | #include "_scm.h" | |
20e6290e | 49 | #include "chars.h" |
0f2d19dd | 50 | |
1bbd0b84 | 51 | #include "scm_validate.h" |
20e6290e | 52 | #include "hash.h" |
0f2d19dd JB |
53 | \f |
54 | ||
55 | #ifndef floor | |
56 | extern double floor(); | |
57 | #endif | |
58 | ||
1cc91f1b | 59 | |
0f2d19dd | 60 | unsigned long |
1bbd0b84 | 61 | scm_hasher(SCM obj, unsigned long n, scm_sizet d) |
0f2d19dd JB |
62 | { |
63 | switch (7 & (int) obj) { | |
64 | case 2: case 6: /* SCM_INUMP(obj) */ | |
65 | return SCM_INUM(obj) % n; | |
66 | case 4: | |
67 | if SCM_ICHRP(obj) | |
68 | return (unsigned)(scm_downcase(SCM_ICHR(obj))) % n; | |
69 | switch ((int) obj) { | |
70 | #ifndef SICP | |
71 | case (int) SCM_EOL: d = 256; break; | |
72 | #endif | |
73 | case (int) SCM_BOOL_T: d = 257; break; | |
74 | case (int) SCM_BOOL_F: d = 258; break; | |
75 | case (int) SCM_EOF_VAL: d = 259; break; | |
76 | default: d = 263; /* perhaps should be error */ | |
77 | } | |
78 | return d % n; | |
79 | default: return 263 % n; /* perhaps should be error */ | |
80 | case 0: | |
81 | switch SCM_TYP7(obj) { | |
82 | default: return 263 % n; | |
83 | case scm_tc7_smob: | |
84 | switch SCM_TYP16(obj) { | |
85 | case scm_tcs_bignums: | |
86 | bighash: return SCM_INUM(scm_modulo(obj, SCM_MAKINUM(n))); | |
87 | default: return 263 % n; | |
88 | #ifdef SCM_FLOATS | |
89 | case scm_tc16_flo: | |
90 | if SCM_REALP(obj) { | |
91 | double r = SCM_REALPART(obj); | |
92 | if (floor(r)==r) { | |
93 | obj = scm_inexact_to_exact (obj); | |
94 | if SCM_IMP(obj) return SCM_INUM(obj) % n; | |
95 | goto bighash; | |
96 | } | |
97 | } | |
98 | obj = scm_number_to_string(obj, SCM_MAKINUM(10)); | |
99 | #endif | |
100 | } | |
101 | case scm_tcs_symbols: | |
102 | case scm_tc7_string: | |
0f2d19dd | 103 | case scm_tc7_substring: |
0f2d19dd JB |
104 | return scm_strhash(SCM_ROUCHARS(obj), (scm_sizet) SCM_ROLENGTH(obj), n); |
105 | case scm_tc7_wvect: | |
106 | case scm_tc7_vector: | |
107 | { | |
108 | scm_sizet len = SCM_LENGTH(obj); | |
109 | SCM *data = SCM_VELTS(obj); | |
110 | if (len>5) | |
111 | { | |
112 | scm_sizet i = d/2; | |
113 | unsigned long h = 1; | |
114 | while (i--) h = ((h<<8) + (scm_hasher(data[h % len], n, 2))) % n; | |
115 | return h; | |
116 | } | |
117 | else | |
118 | { | |
119 | scm_sizet i = len; | |
120 | unsigned long h = (n)-1; | |
121 | while (i--) h = ((h<<8) + (scm_hasher(data[i], n, d/len))) % n; | |
122 | return h; | |
123 | } | |
124 | } | |
125 | case scm_tcs_cons_imcar: case scm_tcs_cons_nimcar: | |
126 | if (d) return (scm_hasher(SCM_CAR(obj), n, d/2)+scm_hasher(SCM_CDR(obj), n, d/2)) % n; | |
127 | else return 1; | |
128 | case scm_tc7_port: | |
129 | return ((SCM_RDNG & SCM_CAR(obj)) ? 260 : 261) % n; | |
130 | case scm_tcs_closures: case scm_tc7_contin: case scm_tcs_subrs: | |
131 | return 262 % n; | |
132 | } | |
133 | } | |
134 | } | |
135 | ||
136 | ||
137 | \f | |
138 | ||
1cc91f1b | 139 | |
0f2d19dd | 140 | unsigned int |
1bbd0b84 | 141 | scm_ihashq (SCM obj, unsigned int n) |
0f2d19dd JB |
142 | { |
143 | return (((unsigned int) obj) >> 1) % n; | |
144 | } | |
145 | ||
146 | ||
a1ec6916 | 147 | SCM_DEFINE(scm_hashq, "hashq", 2, 0, 0, |
1bbd0b84 | 148 | (SCM obj, SCM n), |
4079f87e GB |
149 | "@deffnx primitive hashv key size |
150 | @deffnx primitive hash key size | |
151 | Default hash functions for Guile hash tables. @var{key} is the | |
152 | object to be hashed, and @var{size} is the size of the target hash | |
153 | table. Each function returns an integer in the range 0 to | |
154 | @var{size}-1.") | |
1bbd0b84 | 155 | #define FUNC_NAME s_scm_hashq |
0f2d19dd | 156 | { |
47c6b75e | 157 | SCM_VALIDATE_INUM_MIN(2,n,0); |
0f2d19dd JB |
158 | return SCM_MAKINUM(scm_ihashq (obj, SCM_INUM (n))); |
159 | } | |
1bbd0b84 | 160 | #undef FUNC_NAME |
0f2d19dd JB |
161 | |
162 | ||
163 | \f | |
164 | ||
1cc91f1b | 165 | |
0f2d19dd | 166 | unsigned int |
1bbd0b84 | 167 | scm_ihashv (SCM obj, unsigned int n) |
0f2d19dd JB |
168 | { |
169 | if (SCM_ICHRP(obj)) | |
170 | return ((unsigned int)(scm_downcase(SCM_ICHR(obj)))) % n; /* downcase!?!! */ | |
171 | ||
0c95b57d | 172 | if (SCM_NUMP(obj)) |
0f2d19dd JB |
173 | return (unsigned int) scm_hasher(obj, n, 10); |
174 | else | |
175 | return ((unsigned int)obj) % n; | |
176 | } | |
177 | ||
178 | ||
a1ec6916 | 179 | SCM_DEFINE(scm_hashv, "hashv", 2, 0, 0, |
1bbd0b84 GB |
180 | (SCM obj, SCM n), |
181 | "") | |
182 | #define FUNC_NAME s_scm_hashv | |
0f2d19dd | 183 | { |
47c6b75e | 184 | SCM_VALIDATE_INUM_MIN(2,n,0); |
0f2d19dd JB |
185 | return SCM_MAKINUM(scm_ihashv (obj, SCM_INUM (n))); |
186 | } | |
1bbd0b84 | 187 | #undef FUNC_NAME |
0f2d19dd JB |
188 | |
189 | ||
190 | \f | |
191 | ||
1cc91f1b | 192 | |
0f2d19dd | 193 | unsigned int |
1bbd0b84 | 194 | scm_ihash (SCM obj, unsigned int n) |
0f2d19dd JB |
195 | { |
196 | return (unsigned int)scm_hasher (obj, n, 10); | |
197 | } | |
198 | ||
a1ec6916 | 199 | SCM_DEFINE(scm_hash, "hash", 2, 0, 0, |
1bbd0b84 GB |
200 | (SCM obj, SCM n), |
201 | "") | |
202 | #define FUNC_NAME s_scm_hash | |
0f2d19dd | 203 | { |
47c6b75e | 204 | SCM_VALIDATE_INUM_MIN(2,n,0); |
0f2d19dd JB |
205 | return SCM_MAKINUM(scm_ihash(obj, SCM_INUM(n))); |
206 | } | |
1bbd0b84 | 207 | #undef FUNC_NAME |
0f2d19dd JB |
208 | |
209 | ||
210 | \f | |
211 | ||
1cc91f1b | 212 | |
0f2d19dd JB |
213 | void |
214 | scm_init_hash () | |
0f2d19dd JB |
215 | { |
216 | #include "hash.x" | |
217 | } | |
218 |