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ed3ef339 DE |
1 | /* GDB/Scheme charset interface. |
2 | ||
e2882c85 | 3 | Copyright (C) 2014-2018 Free Software Foundation, Inc. |
ed3ef339 DE |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | /* See README file in this directory for implementation notes, coding | |
21 | conventions, et.al. */ | |
22 | ||
23 | #include "defs.h" | |
ed3ef339 DE |
24 | #include "charset.h" |
25 | #include "guile-internal.h" | |
26 | ||
d2929fdc DE |
27 | /* Convert STRING to an int. |
28 | STRING must be a valid integer. */ | |
29 | ||
30 | int | |
31 | gdbscm_scm_string_to_int (SCM string) | |
32 | { | |
33 | char *s = scm_to_latin1_string (string); | |
34 | int r = atoi (s); | |
35 | ||
36 | free (s); | |
37 | return r; | |
38 | } | |
39 | ||
ed3ef339 DE |
40 | /* Convert a C (latin1) string to an SCM string. |
41 | "latin1" is chosen because Guile won't throw an exception. */ | |
42 | ||
43 | SCM | |
44 | gdbscm_scm_from_c_string (const char *string) | |
45 | { | |
46 | return scm_from_latin1_string (string); | |
47 | } | |
48 | ||
49 | /* Convert an SCM string to a C (latin1) string. | |
50 | "latin1" is chosen because Guile won't throw an exception. | |
51 | Space for the result is allocated with malloc, caller must free. | |
52 | It is an error to call this if STRING is not a string. */ | |
53 | ||
54 | char * | |
55 | gdbscm_scm_to_c_string (SCM string) | |
56 | { | |
57 | return scm_to_latin1_string (string); | |
58 | } | |
59 | ||
60 | /* Use printf to construct a Scheme string. */ | |
61 | ||
62 | SCM | |
63 | gdbscm_scm_from_printf (const char *format, ...) | |
64 | { | |
65 | va_list args; | |
66 | char *string; | |
67 | SCM result; | |
68 | ||
69 | va_start (args, format); | |
70 | string = xstrvprintf (format, args); | |
71 | va_end (args); | |
72 | result = scm_from_latin1_string (string); | |
73 | xfree (string); | |
74 | ||
75 | return result; | |
76 | } | |
77 | ||
78 | /* Struct to pass data from gdbscm_scm_to_string to | |
79 | gdbscm_call_scm_to_stringn. */ | |
80 | ||
81 | struct scm_to_stringn_data | |
82 | { | |
83 | SCM string; | |
84 | size_t *lenp; | |
85 | const char *charset; | |
f486487f | 86 | scm_t_string_failed_conversion_handler conversion_kind; |
ed3ef339 DE |
87 | char *result; |
88 | }; | |
89 | ||
90 | /* Helper for gdbscm_scm_to_string to call scm_to_stringn | |
91 | from within scm_c_catch. */ | |
92 | ||
93 | static SCM | |
94 | gdbscm_call_scm_to_stringn (void *datap) | |
95 | { | |
9a3c8263 | 96 | struct scm_to_stringn_data *data = (struct scm_to_stringn_data *) datap; |
ed3ef339 DE |
97 | |
98 | data->result = scm_to_stringn (data->string, data->lenp, data->charset, | |
99 | data->conversion_kind); | |
100 | return SCM_BOOL_F; | |
101 | } | |
102 | ||
103 | /* Convert an SCM string to a string in charset CHARSET. | |
104 | This function is guaranteed to not throw an exception. | |
06eb1586 DE |
105 | |
106 | If LENP is NULL then the returned string is NUL-terminated, | |
107 | and an exception is thrown if the string contains embedded NULs. | |
108 | Otherwise the string is not guaranteed to be NUL-terminated, but worse | |
109 | there's no space to put a NUL if we wanted to (scm_to_stringn limitation). | |
110 | ||
ed3ef339 DE |
111 | If STRICT is non-zero, and there's a conversion error, then a |
112 | <gdb:exception> object is stored in *EXCEPT_SCMP, and NULL is returned. | |
113 | If STRICT is zero, then escape sequences are used for characters that | |
114 | can't be converted, and EXCEPT_SCMP may be passed as NULL. | |
06eb1586 | 115 | |
ed3ef339 DE |
116 | Space for the result is allocated with malloc, caller must free. |
117 | It is an error to call this if STRING is not a string. */ | |
118 | ||
119 | char * | |
120 | gdbscm_scm_to_string (SCM string, size_t *lenp, | |
121 | const char *charset, int strict, SCM *except_scmp) | |
122 | { | |
123 | struct scm_to_stringn_data data; | |
124 | SCM scm_result; | |
125 | ||
126 | data.string = string; | |
127 | data.lenp = lenp; | |
128 | data.charset = charset; | |
129 | data.conversion_kind = (strict | |
130 | ? SCM_FAILED_CONVERSION_ERROR | |
131 | : SCM_FAILED_CONVERSION_ESCAPE_SEQUENCE); | |
132 | data.result = NULL; | |
133 | ||
134 | scm_result = gdbscm_call_guile (gdbscm_call_scm_to_stringn, &data, NULL); | |
135 | ||
136 | if (gdbscm_is_false (scm_result)) | |
137 | { | |
138 | gdb_assert (data.result != NULL); | |
139 | return data.result; | |
140 | } | |
141 | gdb_assert (gdbscm_is_exception (scm_result)); | |
142 | *except_scmp = scm_result; | |
143 | return NULL; | |
144 | } | |
145 | ||
146 | /* Struct to pass data from gdbscm_scm_from_string to | |
147 | gdbscm_call_scm_from_stringn. */ | |
148 | ||
149 | struct scm_from_stringn_data | |
150 | { | |
151 | const char *string; | |
152 | size_t len; | |
153 | const char *charset; | |
f486487f | 154 | scm_t_string_failed_conversion_handler conversion_kind; |
ed3ef339 DE |
155 | SCM result; |
156 | }; | |
157 | ||
158 | /* Helper for gdbscm_scm_from_string to call scm_from_stringn | |
159 | from within scm_c_catch. */ | |
160 | ||
161 | static SCM | |
162 | gdbscm_call_scm_from_stringn (void *datap) | |
163 | { | |
9a3c8263 | 164 | struct scm_from_stringn_data *data = (struct scm_from_stringn_data *) datap; |
ed3ef339 DE |
165 | |
166 | data->result = scm_from_stringn (data->string, data->len, data->charset, | |
167 | data->conversion_kind); | |
168 | return SCM_BOOL_F; | |
169 | } | |
170 | ||
171 | /* Convert STRING to a Scheme string in charset CHARSET. | |
172 | This function is guaranteed to not throw an exception. | |
06eb1586 | 173 | |
ed3ef339 DE |
174 | If STRICT is non-zero, and there's a conversion error, then a |
175 | <gdb:exception> object is returned. | |
176 | If STRICT is zero, then question marks are used for characters that | |
177 | can't be converted (limitation of underlying Guile conversion support). */ | |
178 | ||
179 | SCM | |
180 | gdbscm_scm_from_string (const char *string, size_t len, | |
181 | const char *charset, int strict) | |
182 | { | |
183 | struct scm_from_stringn_data data; | |
184 | SCM scm_result; | |
185 | ||
186 | data.string = string; | |
187 | data.len = len; | |
188 | data.charset = charset; | |
189 | /* The use of SCM_FAILED_CONVERSION_QUESTION_MARK is specified by Guile. */ | |
190 | data.conversion_kind = (strict | |
191 | ? SCM_FAILED_CONVERSION_ERROR | |
192 | : SCM_FAILED_CONVERSION_QUESTION_MARK); | |
193 | data.result = SCM_UNDEFINED; | |
194 | ||
195 | scm_result = gdbscm_call_guile (gdbscm_call_scm_from_stringn, &data, NULL); | |
196 | ||
197 | if (gdbscm_is_false (scm_result)) | |
198 | { | |
199 | gdb_assert (!SCM_UNBNDP (data.result)); | |
200 | return data.result; | |
201 | } | |
202 | gdb_assert (gdbscm_is_exception (scm_result)); | |
203 | return scm_result; | |
204 | } | |
205 | ||
06eb1586 DE |
206 | /* Convert an SCM string to a host string. |
207 | This function is guaranteed to not throw an exception. | |
208 | ||
209 | If LENP is NULL then the returned string is NUL-terminated, | |
210 | and if the string contains embedded NULs then NULL is returned with | |
211 | an exception object stored in *EXCEPT_SCMP. | |
212 | Otherwise the string is not guaranteed to be NUL-terminated, but worse | |
213 | there's no space to put a NUL if we wanted to (scm_to_stringn limitation). | |
214 | ||
215 | Returns NULL if there is a conversion error, with the exception object | |
216 | stored in *EXCEPT_SCMP. | |
217 | Space for the result is allocated with malloc, caller must free. | |
218 | It is an error to call this if STRING is not a string. */ | |
219 | ||
220 | char * | |
221 | gdbscm_scm_to_host_string (SCM string, size_t *lenp, SCM *except_scmp) | |
222 | { | |
223 | return gdbscm_scm_to_string (string, lenp, host_charset (), 1, except_scmp); | |
224 | } | |
225 | ||
226 | /* Convert a host string to an SCM string. | |
227 | This function is guaranteed to not throw an exception. | |
228 | Returns a <gdb:exception> object if there's a conversion error. */ | |
229 | ||
230 | SCM | |
231 | gdbscm_scm_from_host_string (const char *string, size_t len) | |
232 | { | |
233 | return gdbscm_scm_from_string (string, len, host_charset (), 1); | |
234 | } | |
235 | ||
ed3ef339 DE |
236 | /* (string->argv string) -> list |
237 | Return list of strings split up according to GDB's argv parsing rules. | |
238 | This is useful when writing GDB commands in Scheme. */ | |
239 | ||
240 | static SCM | |
241 | gdbscm_string_to_argv (SCM string_scm) | |
242 | { | |
243 | char *string; | |
ed3ef339 DE |
244 | SCM result = SCM_EOL; |
245 | ||
246 | gdbscm_parse_function_args (FUNC_NAME, SCM_ARG1, NULL, "s", | |
247 | string_scm, &string); | |
248 | ||
249 | if (string == NULL || *string == '\0') | |
250 | { | |
251 | xfree (string); | |
252 | return SCM_EOL; | |
253 | } | |
254 | ||
773a1edc TT |
255 | gdb_argv c_argv (string); |
256 | for (char *arg : c_argv) | |
257 | result = scm_cons (gdbscm_scm_from_c_string (arg), result); | |
ed3ef339 | 258 | |
ed3ef339 DE |
259 | xfree (string); |
260 | ||
261 | return scm_reverse_x (result, SCM_EOL); | |
262 | } | |
263 | \f | |
264 | /* Initialize the Scheme charset interface to GDB. */ | |
265 | ||
266 | static const scheme_function string_functions[] = | |
267 | { | |
72e02483 | 268 | { "string->argv", 1, 0, 0, as_a_scm_t_subr (gdbscm_string_to_argv), |
ed3ef339 DE |
269 | "\ |
270 | Convert a string to a list of strings split up according to\n\ | |
271 | gdb's argv parsing rules." }, | |
272 | ||
273 | END_FUNCTIONS | |
274 | }; | |
275 | ||
276 | void | |
277 | gdbscm_initialize_strings (void) | |
278 | { | |
279 | gdbscm_define_functions (string_functions, 1); | |
280 | } |