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1e598865 | 1 | /* Copyright (C) 1995,1996,1997 Free Software Foundation, Inc. |
ee2a8b9b 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 | |
ee2a8b9b 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. */ |
ee2a8b9b JB |
41 | \f |
42 | ||
43 | /* data initialization and C<->Scheme data conversion */ | |
44 | ||
45 | #include <stdio.h> | |
46 | ||
47 | #include <gh.h> | |
48 | ||
49 | /* data conversion C->scheme */ | |
50 | SCM | |
dbb3005d MG |
51 | gh_int2scmb (int x) /* this is being phased out */ |
52 | { | |
53 | return (x ? SCM_BOOL_T : SCM_BOOL_F); | |
54 | } | |
55 | SCM | |
56 | gh_bool2scm (int x) | |
ee2a8b9b JB |
57 | { |
58 | return (x ? SCM_BOOL_T : SCM_BOOL_F); | |
59 | } | |
60 | SCM | |
61 | gh_int2scm (int x) | |
62 | { | |
63 | return scm_long2num ((long) x); | |
64 | } | |
65 | SCM | |
66 | gh_ulong2scm (unsigned long x) | |
67 | { | |
68 | return scm_ulong2num (x); | |
69 | } | |
70 | SCM | |
71 | gh_long2scm (long x) | |
72 | { | |
73 | return scm_long2num (x); | |
74 | } | |
75 | SCM | |
76 | gh_double2scm (double x) | |
77 | { | |
78 | return scm_makdbl (x, 0.0); | |
79 | } | |
80 | SCM | |
81 | gh_char2scm (char c) | |
82 | { | |
83 | return SCM_MAKICHR (c); | |
84 | } | |
85 | SCM | |
86 | gh_str2scm (char *s, int len) | |
87 | { | |
88 | return scm_makfromstr (s, len, 0); | |
89 | } | |
90 | SCM | |
91 | gh_str02scm (char *s) | |
92 | { | |
93 | return scm_makfrom0str (s); | |
94 | } | |
95 | /* Copy LEN characters at SRC into the *existing* Scheme string DST, | |
96 | starting at START. START is an index into DST; zero means the | |
97 | beginning of the string. | |
98 | ||
99 | If START + LEN is off the end of DST, signal an out-of-range | |
100 | error. */ | |
101 | void | |
102 | gh_set_substr (char *src, SCM dst, int start, int len) | |
103 | { | |
104 | char *dst_ptr, dst_len, effective_length; | |
105 | ||
106 | SCM_ASSERT (SCM_NIMP (dst) && SCM_STRINGP (dst), dst, SCM_ARG3, | |
107 | "gh_set_substr"); | |
108 | scm_protect_object (dst); | |
109 | dst_ptr = SCM_CHARS (dst); | |
110 | dst_len = SCM_LENGTH (dst); | |
111 | effective_length = (len < dst_len) ? len : dst_len; | |
112 | memcpy (dst_ptr + start, src, effective_length); | |
113 | /* FIXME: must signal an error if len > dst_len */ | |
114 | scm_unprotect_object (dst); | |
115 | } | |
116 | ||
117 | /* Return the symbol named SYMBOL_STR. */ | |
118 | SCM | |
119 | gh_symbol2scm (char *symbol_str) | |
120 | { | |
121 | return SCM_CAR (scm_intern (symbol_str, strlen (symbol_str))); | |
122 | } | |
123 | ||
124 | ||
125 | /* data conversion scheme->C */ | |
126 | int | |
127 | gh_scm2bool (SCM obj) | |
128 | { | |
129 | return ((obj) == SCM_BOOL_F) ? 0 : 1; | |
130 | } | |
131 | unsigned long | |
132 | gh_scm2ulong (SCM obj) | |
133 | { | |
134 | return scm_num2ulong (obj, (char *) SCM_ARG1, "gh_scm2ulong"); | |
135 | } | |
136 | long | |
137 | gh_scm2long (SCM obj) | |
138 | { | |
139 | return scm_num2long (obj, (char *) SCM_ARG1, "gh_scm2long"); | |
140 | } | |
141 | int | |
142 | gh_scm2int (SCM obj) | |
143 | { | |
144 | /* NOTE: possible loss of precision here */ | |
145 | return (int) scm_num2long (obj, (char *) SCM_ARG1, "gh_scm2int"); | |
146 | } | |
147 | double | |
148 | gh_scm2double (SCM obj) | |
149 | { | |
150 | return scm_num2dbl (obj, "gh_scm2double"); | |
151 | } | |
152 | char | |
153 | gh_scm2char (SCM obj) | |
154 | { | |
155 | return SCM_ICHR (obj); | |
156 | } | |
157 | ||
158 | /* string conversions between C and Scheme */ | |
159 | ||
160 | /* gh_scm2newstr() -- Given a Scheme string STR, return a pointer to a | |
161 | new copy of its contents, followed by a null byte. If lenp is | |
162 | non-null, set *lenp to the string's length. | |
163 | ||
164 | This function uses malloc to obtain storage for the copy; the | |
165 | caller is responsible for freeing it. | |
166 | ||
167 | Note that Scheme strings may contain arbitrary data, including null | |
168 | characters. This means that null termination is not a reliable way | |
169 | to determine the length of the returned value. However, the | |
170 | function always copies the complete contents of STR, and sets | |
171 | *LEN_P to the true length of the string (when LEN_P is non-null). */ | |
172 | char * | |
173 | gh_scm2newstr (SCM str, int *lenp) | |
174 | { | |
175 | char *ret_str; | |
176 | int len; | |
177 | ||
178 | SCM_ASSERT (SCM_NIMP (str) && SCM_STRINGP (str), str, SCM_ARG3, | |
179 | "gh_scm2newstr"); | |
180 | ||
181 | /* protect str from GC while we copy off its data */ | |
182 | scm_protect_object (str); | |
183 | ||
184 | len = SCM_LENGTH (str); | |
185 | ||
9b1b00fe JB |
186 | ret_str = (char *) scm_must_malloc ((len + 1) * sizeof (char), |
187 | "gh_scm2newstr"); | |
ee2a8b9b JB |
188 | /* so we copy tmp_str to ret_str, which is what we will allocate */ |
189 | memcpy (ret_str, SCM_CHARS (str), len); | |
190 | /* now make sure we null-terminate it */ | |
191 | ret_str[len] = '\0'; | |
192 | ||
193 | scm_unprotect_object (str); | |
194 | ||
195 | if (lenp != NULL) | |
196 | { | |
197 | *lenp = len; | |
198 | } | |
199 | ||
200 | return ret_str; | |
201 | } | |
202 | ||
203 | ||
204 | /* Copy LEN characters at START from the Scheme string SRC to memory | |
205 | at DST. START is an index into SRC; zero means the beginning of | |
206 | the string. DST has already been allocated by the caller. | |
207 | ||
208 | If START + LEN is off the end of SRC, silently truncate the source | |
209 | region to fit the string. If truncation occurs, the corresponding | |
210 | area of DST is left unchanged. */ | |
211 | void | |
212 | gh_get_substr (SCM src, char *dst, int start, int len) | |
213 | { | |
214 | int src_len, effective_length; | |
215 | SCM_ASSERT (SCM_NIMP (src) && SCM_STRINGP (src), src, SCM_ARG3, | |
216 | "gh_get_substr"); | |
217 | ||
218 | scm_protect_object (src); | |
219 | src_len = SCM_LENGTH (src); | |
220 | effective_length = (len < src_len) ? len : src_len; | |
221 | memcpy (dst + start, SCM_CHARS (src), effective_length * sizeof (char)); | |
222 | /* FIXME: must signal an error if len > src_len */ | |
223 | scm_unprotect_object (src); | |
224 | } | |
225 | ||
226 | ||
227 | /* gh_scm2newsymbol() -- Given a Scheme symbol 'identifier, return a | |
228 | pointer to a string with the symbol characters "identifier", | |
229 | followed by a null byte. If lenp is non-null, set *lenp to the | |
230 | string's length. | |
231 | ||
232 | This function uses malloc to obtain storage for the copy; the | |
233 | caller is responsible for freeing it. */ | |
234 | char * | |
235 | gh_symbol2newstr (SCM sym, int *lenp) | |
236 | { | |
237 | char *ret_str; | |
238 | int len; | |
239 | ||
240 | SCM_ASSERT (SCM_NIMP (sym) && SCM_SYMBOLP (sym), sym, SCM_ARG3, | |
241 | "gh_scm2newsymbol"); | |
242 | ||
243 | /* protect str from GC while we copy off its data */ | |
244 | scm_protect_object (sym); | |
245 | ||
246 | len = SCM_LENGTH (sym); | |
247 | ||
9b1b00fe JB |
248 | ret_str = (char *) scm_must_malloc ((len + 1) * sizeof (char), |
249 | "gh_symbol2newstr"); | |
ee2a8b9b JB |
250 | /* so we copy tmp_str to ret_str, which is what we will allocate */ |
251 | memcpy (ret_str, SCM_CHARS (sym), len); | |
252 | /* now make sure we null-terminate it */ | |
253 | ret_str[len] = '\0'; | |
254 | ||
255 | scm_unprotect_object (sym); | |
256 | ||
257 | if (lenp != NULL) | |
258 | { | |
259 | *lenp = len; | |
260 | } | |
261 | ||
262 | return ret_str; | |
263 | } | |
264 | ||
265 | ||
266 | /* create a new vector of the given length, all initialized to the | |
267 | given value */ | |
e5eece74 MG |
268 | SCM |
269 | gh_make_vector (SCM len, SCM fill) | |
ee2a8b9b | 270 | { |
e5eece74 MG |
271 | /* scm_make_vector() takes a third boolean argument which should be |
272 | set to SCM_BOOL_T when you are dealing with multi-dimensional | |
273 | arrays; gh_make_vector() does not do multi-dimensional arrays */ | |
274 | return scm_make_vector(len, fill, SCM_BOOL_F); | |
ee2a8b9b JB |
275 | } |
276 | ||
277 | /* set the given element of the given vector to the given value */ | |
278 | SCM | |
e5eece74 | 279 | gh_vector_set (SCM vec, SCM pos, SCM val) |
ee2a8b9b JB |
280 | { |
281 | return scm_vector_set_x (vec, pos, val); | |
282 | } | |
283 | ||
284 | /* retrieve the given element of the given vector */ | |
285 | SCM | |
e5eece74 | 286 | gh_vector_ref (SCM vec, SCM pos) |
ee2a8b9b JB |
287 | { |
288 | return scm_vector_ref (vec, pos); | |
289 | } | |
290 | ||
291 | /* returns the length of the given vector */ | |
292 | unsigned long | |
293 | gh_vector_length (SCM v) | |
294 | { | |
295 | return gh_scm2ulong (scm_vector_length (v)); | |
296 | } | |
35379308 JB |
297 | |
298 | /* Data lookups between C and Scheme | |
299 | ||
300 | Look up a symbol with a given name, and return the object to which | |
301 | it is bound. gh_lookup examines the Guile top level, and | |
302 | gh_module_lookup checks the module namespace specified by the | |
303 | `vec' argument. | |
304 | ||
305 | The return value is the Scheme object to which SNAME is bound, or | |
306 | SCM_UNDEFINED if SNAME is not bound in the given context. [FIXME: | |
307 | should this be SCM_UNSPECIFIED? Can a symbol ever legitimately be | |
308 | bound to SCM_UNDEFINED or SCM_UNSPECIFIED? What is the difference? | |
309 | -twp] */ | |
310 | ||
311 | SCM | |
312 | gh_lookup (char *sname) | |
313 | { | |
314 | return gh_module_lookup (SCM_BOOL_F, sname); | |
315 | } | |
316 | ||
317 | SCM | |
318 | gh_module_lookup (SCM vec, char *sname) | |
319 | { | |
320 | SCM sym = gh_symbol2scm (sname); | |
321 | if ((scm_symbol_bound_p (vec, sym)) == SCM_BOOL_T) | |
322 | return scm_symbol_binding (vec, sym); | |
323 | else | |
324 | return SCM_UNDEFINED; | |
325 | } |