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22a52da1 | 1 | /* Copyright (C) 1995,1996,1997,1998,2000,2001 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 | 41 | |
1bbd0b84 | 42 | |
0f2d19dd | 43 | \f |
a0599745 MD |
44 | #include "libguile/_scm.h" |
45 | #include "libguile/ramap.h" | |
46 | #include "libguile/stackchk.h" | |
47 | #include "libguile/strorder.h" | |
48 | #include "libguile/async.h" | |
49 | #include "libguile/root.h" | |
50 | #include "libguile/smob.h" | |
51 | #include "libguile/unif.h" | |
52 | #include "libguile/vectors.h" | |
0f2d19dd | 53 | |
a0599745 MD |
54 | #include "libguile/validate.h" |
55 | #include "libguile/eq.h" | |
0f2d19dd | 56 | \f |
c3ee7520 | 57 | SCM_DEFINE1 (scm_eq_p, "eq?", scm_tc7_rpsubr, |
1bbd0b84 | 58 | (SCM x, SCM y), |
cdbc7418 NJ |
59 | "Return @code{#t} iff @var{x} references the same object as @var{y}.\n" |
60 | "@code{eq?} is similar to @code{eqv?} except that in some cases it is\n" | |
61 | "capable of discerning distinctions finer than those detectable by\n" | |
62 | "@code{eqv?}.") | |
1bbd0b84 | 63 | #define FUNC_NAME s_scm_eq_p |
0f2d19dd | 64 | { |
fbd485ba | 65 | return SCM_BOOL (SCM_EQ_P (x, y)); |
0f2d19dd | 66 | } |
1bbd0b84 | 67 | #undef FUNC_NAME |
0f2d19dd | 68 | |
96d00047 MV |
69 | /* We compare doubles in a special way for 'eqv?' to be able to |
70 | distinguish plus and minus zero and to identify NaNs. | |
71 | */ | |
72 | ||
73 | static int | |
74 | real_eqv (double x, double y) | |
75 | { | |
76 | return !memcmp (&x, &y, sizeof(double)); | |
77 | } | |
0f2d19dd | 78 | |
c3ee7520 | 79 | SCM_DEFINE1 (scm_eqv_p, "eqv?", scm_tc7_rpsubr, |
1bbd0b84 | 80 | (SCM x, SCM y), |
cdbc7418 NJ |
81 | "The @code{eqv?} procedure defines a useful equivalence relation on objects.\n" |
82 | "Briefly, it returns @code{#t} if @var{x} and @var{y} should normally be\n" | |
83 | "regarded as the same object. This relation is left slightly open to\n" | |
84 | "interpretation, but works for comparing immediate integers, characters,\n" | |
85 | "and inexact numbers.") | |
1bbd0b84 | 86 | #define FUNC_NAME s_scm_eqv_p |
0f2d19dd | 87 | { |
fbd485ba | 88 | if (SCM_EQ_P (x, y)) |
950cc72b MD |
89 | return SCM_BOOL_T; |
90 | if (SCM_IMP (x)) | |
91 | return SCM_BOOL_F; | |
92 | if (SCM_IMP (y)) | |
93 | return SCM_BOOL_F; | |
0f2d19dd | 94 | /* this ensures that types and scm_length are the same. */ |
fbd485ba | 95 | if (SCM_CELL_TYPE (x) != SCM_CELL_TYPE (y)) |
950cc72b MD |
96 | { |
97 | /* treat mixes of real and complex types specially */ | |
98 | if (SCM_SLOPPY_INEXACTP (x)) | |
99 | { | |
100 | if (SCM_SLOPPY_REALP (x)) | |
101 | return SCM_BOOL (SCM_SLOPPY_COMPLEXP (y) | |
96d00047 MV |
102 | && real_eqv (SCM_REAL_VALUE (x), |
103 | SCM_COMPLEX_REAL (y)) | |
950cc72b MD |
104 | && 0.0 == SCM_COMPLEX_IMAG (y)); |
105 | else | |
106 | return SCM_BOOL (SCM_SLOPPY_REALP (y) | |
96d00047 MV |
107 | && real_eqv (SCM_COMPLEX_REAL (x), |
108 | SCM_REAL_VALUE (y)) | |
950cc72b MD |
109 | && SCM_COMPLEX_IMAG (x) == 0.0); |
110 | } | |
111 | return SCM_BOOL_F; | |
112 | } | |
113 | if (SCM_NUMP (x)) | |
114 | { | |
eb42e2f0 | 115 | if (SCM_BIGP (x)) { |
950cc72b | 116 | return SCM_BOOL (0 == scm_bigcomp (x, y)); |
eb42e2f0 | 117 | } else if (SCM_SLOPPY_REALP (x)) { |
96d00047 | 118 | return SCM_BOOL (real_eqv (SCM_REAL_VALUE (x), SCM_REAL_VALUE (y))); |
eb42e2f0 | 119 | } else { /* complex */ |
96d00047 MV |
120 | return SCM_BOOL (real_eqv (SCM_COMPLEX_REAL (x), |
121 | SCM_COMPLEX_REAL (y)) | |
122 | && real_eqv (SCM_COMPLEX_IMAG (x), | |
123 | SCM_COMPLEX_IMAG (y))); | |
eb42e2f0 | 124 | } |
950cc72b | 125 | } |
0f2d19dd JB |
126 | return SCM_BOOL_F; |
127 | } | |
1bbd0b84 | 128 | #undef FUNC_NAME |
0f2d19dd JB |
129 | |
130 | ||
c3ee7520 | 131 | SCM_DEFINE1 (scm_equal_p, "equal?", scm_tc7_rpsubr, |
1bbd0b84 | 132 | (SCM x, SCM y), |
cdbc7418 NJ |
133 | "Return @code{#t} iff @var{x} and @var{y} are recursively @code{eqv?} equivalent.\n" |
134 | "@code{equal?} recursively compares the contents of pairs,\n" | |
135 | "vectors, and strings, applying @code{eqv?} on other objects such as\n" | |
136 | "numbers and symbols. A rule of thumb is that objects are generally\n" | |
137 | "@code{equal?} if they print the same. @code{equal?} may fail to\n" | |
138 | "terminate if its arguments are circular data structures.") | |
1bbd0b84 | 139 | #define FUNC_NAME s_scm_equal_p |
0f2d19dd JB |
140 | { |
141 | SCM_CHECK_STACK; | |
950cc72b MD |
142 | tailrecurse: |
143 | SCM_TICK; | |
fbd485ba | 144 | if (SCM_EQ_P (x, y)) |
950cc72b MD |
145 | return SCM_BOOL_T; |
146 | if (SCM_IMP (x)) | |
147 | return SCM_BOOL_F; | |
148 | if (SCM_IMP (y)) | |
149 | return SCM_BOOL_F; | |
22a52da1 | 150 | if (SCM_CONSP (x) && SCM_CONSP (y)) |
950cc72b MD |
151 | { |
152 | if (SCM_FALSEP (scm_equal_p (SCM_CAR (x), SCM_CAR (y)))) | |
153 | return SCM_BOOL_F; | |
154 | x = SCM_CDR(x); | |
155 | y = SCM_CDR(y); | |
156 | goto tailrecurse; | |
157 | } | |
158 | if (SCM_TYP7S (x) == scm_tc7_string && SCM_TYP7S (y) == scm_tc7_string) | |
159 | return scm_string_equal_p (x, y); | |
160 | /* This ensures that types and scm_length are the same. */ | |
fbd485ba | 161 | if (SCM_CELL_TYPE (x) != SCM_CELL_TYPE (y)) |
950cc72b MD |
162 | { |
163 | /* treat mixes of real and complex types specially */ | |
164 | if (SCM_SLOPPY_INEXACTP (x)) | |
165 | { | |
166 | if (SCM_SLOPPY_REALP (x)) | |
167 | return SCM_BOOL (SCM_SLOPPY_COMPLEXP (y) | |
168 | && SCM_REAL_VALUE (x) == SCM_COMPLEX_REAL (y) | |
169 | && 0.0 == SCM_COMPLEX_IMAG (y)); | |
170 | else | |
171 | return SCM_BOOL (SCM_SLOPPY_REALP (y) | |
172 | && SCM_COMPLEX_REAL (x) == SCM_REAL_VALUE (y) | |
173 | && SCM_COMPLEX_IMAG (x) == 0.0); | |
0f2d19dd | 174 | } |
950cc72b MD |
175 | return SCM_BOOL_F; |
176 | } | |
177 | switch (SCM_TYP7 (x)) | |
178 | { | |
179 | default: | |
180 | return SCM_BOOL_F; | |
181 | case scm_tc7_vector: | |
182 | case scm_tc7_wvect: | |
183 | return scm_vector_equal_p (x, y); | |
184 | case scm_tc7_smob: | |
185 | { | |
186 | int i = SCM_SMOBNUM (x); | |
187 | if (!(i < scm_numsmob)) | |
188 | return SCM_BOOL_F; | |
189 | if (scm_smobs[i].equalp) | |
190 | return (scm_smobs[i].equalp) (x, y); | |
191 | else | |
192 | return SCM_BOOL_F; | |
193 | } | |
afe5177e | 194 | #ifdef HAVE_ARRAYS |
950cc72b MD |
195 | case scm_tc7_bvect: case scm_tc7_uvect: case scm_tc7_ivect: |
196 | case scm_tc7_fvect: case scm_tc7_cvect: case scm_tc7_dvect: | |
197 | case scm_tc7_svect: | |
5c11cc9d | 198 | #ifdef HAVE_LONG_LONGS |
950cc72b | 199 | case scm_tc7_llvect: |
0f2d19dd | 200 | #endif |
950cc72b | 201 | case scm_tc7_byvect: |
7a7f7c53 | 202 | if (scm_tc16_array && scm_smobs[SCM_TC2SMOBNUM (scm_tc16_array)].equalp) |
950cc72b | 203 | return scm_array_equal_p (x, y); |
afe5177e | 204 | #endif |
950cc72b MD |
205 | } |
206 | return SCM_BOOL_F; | |
0f2d19dd | 207 | } |
1bbd0b84 | 208 | #undef FUNC_NAME |
0f2d19dd JB |
209 | |
210 | ||
211 | \f | |
212 | ||
213 | ||
1cc91f1b | 214 | |
0f2d19dd JB |
215 | void |
216 | scm_init_eq () | |
0f2d19dd | 217 | { |
a0599745 | 218 | #include "libguile/eq.x" |
0f2d19dd JB |
219 | } |
220 | ||
89e00824 ML |
221 | |
222 | /* | |
223 | Local Variables: | |
224 | c-file-style: "gnu" | |
225 | End: | |
226 | */ |