1 /* Copyright (C) 1995,1996 Free Software Foundation, Inc.
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)
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.
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
15 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
16 * Boston, MA 02111-1307 USA
18 * As a special exception, the Free Software Foundation gives permission
19 * for additional uses of the text contained in its release of GUILE.
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.
27 * This exception does not however invalidate any other reasons why
28 * the executable file might be covered by the GNU General Public License.
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.
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.
40 * If you do not wish that, delete this exception notice. */
57 /* {Ports - string ports}
62 static int prinstpt
SCM_P ((SCM exp
, SCM port
, scm_print_state
*pstate
));
65 prinstpt (exp
, port
, pstate
)
68 scm_print_state
*pstate
;
70 scm_prinport (exp
, port
, "string");
75 static int stputc
SCM_P ((int c
, SCM p
));
82 scm_sizet ind
= SCM_INUM (SCM_CAR (p
));
84 if (ind
>= SCM_LENGTH (SCM_CDR (p
)))
85 scm_vector_set_length_x (SCM_CDR (p
), SCM_MAKINUM (ind
+ (ind
>> 1)));
87 SCM_CHARS (SCM_CDR (p
))[ind
] = c
;
88 SCM_SETCAR (p
, SCM_MAKINUM (ind
+ 1));
93 static scm_sizet stwrite
SCM_P ((char *str
, scm_sizet siz
, scm_sizet num
, SCM p
));
96 stwrite (str
, siz
, num
, p
)
102 scm_sizet ind
= SCM_INUM (SCM_CAR (p
));
103 scm_sizet len
= siz
* num
;
106 if (ind
+ len
>= SCM_LENGTH (SCM_CDR (p
)))
107 scm_vector_set_length_x (SCM_CDR (p
), SCM_MAKINUM (ind
+ len
+ ((ind
+ len
) >> 1)));
109 dst
= &(SCM_CHARS (SCM_CDR (p
))[ind
]);
112 SCM_SETCAR (p
, SCM_MAKINUM (ind
+ siz
* num
));
117 static int stputs
SCM_P ((char *s
, SCM p
));
124 stwrite (s
, 1, strlen (s
), p
);
129 static int stgetc
SCM_P ((SCM p
));
135 scm_sizet ind
= SCM_INUM (SCM_CAR (p
));
136 if (ind
>= SCM_ROLENGTH (SCM_CDR (p
)))
138 SCM_SETCAR (p
, SCM_MAKINUM (ind
+ 1));
139 return SCM_ROUCHARS (SCM_CDR (p
))[ind
];
144 scm_mkstrport (pos
, str
, modes
, caller
)
152 struct scm_port_table
* pt
;
154 SCM_ASSERT(SCM_INUMP(pos
) && SCM_INUM(pos
) >= 0, pos
, SCM_ARG1
, caller
);
155 SCM_ASSERT(SCM_NIMP(str
) && SCM_ROSTRINGP(str
), str
, SCM_ARG1
, caller
);
156 stream
= scm_cons(pos
, str
);
159 pt
= scm_add_to_port_table (z
);
160 SCM_SETCAR (z
, scm_tc16_strport
| modes
);
161 SCM_SETPTAB_ENTRY (z
, pt
);
162 SCM_SETSTREAM (z
, stream
);
167 SCM_PROC(s_call_with_output_string
, "call-with-output-string", 1, 0, 0, scm_call_with_output_string
);
170 scm_call_with_output_string (proc
)
174 p
= scm_mkstrport(SCM_INUM0
, scm_make_string(SCM_MAKINUM(30), SCM_UNDEFINED
),
176 s_call_with_output_string
);
177 scm_apply (proc
, p
, scm_listofnull
);
181 answer
= scm_makfromstr (SCM_CHARS (SCM_CDR (SCM_STREAM (p
))),
182 SCM_INUM (SCM_CAR (SCM_STREAM (p
))),
191 /* Return a Scheme string obtained by printing a given object.
196 scm_strprint_obj (obj
)
202 str
= scm_makstr (64, 0);
203 port
= scm_mkstrport (SCM_MAKINUM (0), str
, SCM_OPN
| SCM_WRTNG
, "scm_strprint_obj");
204 scm_prin1 (obj
, port
, 1);
208 answer
= scm_makfromstr (SCM_CHARS (SCM_CDR (SCM_STREAM (port
))),
209 SCM_INUM (SCM_CAR (SCM_STREAM (port
))),
219 SCM_PROC(s_call_with_input_string
, "call-with-input-string", 2, 0, 0, scm_call_with_input_string
);
222 scm_call_with_input_string (str
, proc
)
226 SCM p
= scm_mkstrport(SCM_INUM0
, str
, SCM_OPN
| SCM_RDNG
, s_call_with_input_string
);
227 return scm_apply (proc
, p
, scm_listofnull
);
232 /* Given a null-terminated string EXPR containing a Scheme expression
233 read it, and return it as an SCM value. */
238 SCM port
= scm_mkstrport (SCM_MAKINUM (0),
239 scm_makfrom0str (expr
),
244 /* Read expressions from that port; ignore the values. */
245 form
= scm_read (port
);
247 scm_close_port (port
);
251 /* Given a null-terminated string EXPR containing Scheme program text,
252 evaluate it, and return the result of the last expression evaluated. */
257 return scm_eval_string (scm_makfrom0str (expr
));
261 SCM_PROC (s_eval_string
, "eval-string", 1, 0, 0, scm_eval_string
);
264 scm_eval_string (string
)
267 SCM port
= scm_mkstrport (SCM_MAKINUM (0), string
, SCM_OPN
| SCM_RDNG
,
270 SCM ans
= SCM_UNSPECIFIED
;
272 /* Read expressions from that port; ignore the values. */
273 while (!SCM_EOF_OBJECT_P (form
= scm_read (port
)))
274 ans
= scm_eval_x (form
);
276 /* Don't close the port here; if we re-enter this function via a
277 continuation, then the next time we enter it, we'll get an error.
278 It's a string port anyway, so there's no advantage to closing it
286 static int noop0
SCM_P ((SCM stream
));
296 scm_ptobfuns scm_stptob
=
316 #include "strports.x"