Commit | Line | Data |
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b9ad392e | 1 | /* Copyright (C) 1995,1996,1998,1999,2000,2001, 2002, 2003 Free Software Foundation, Inc. |
0f2d19dd | 2 | * |
73be1d9e MV |
3 | * This library is free software; you can redistribute it and/or |
4 | * modify it under the terms of the GNU Lesser General Public | |
5 | * License as published by the Free Software Foundation; either | |
6 | * version 2.1 of the License, or (at your option) any later version. | |
0f2d19dd | 7 | * |
73be1d9e MV |
8 | * This library 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 GNU | |
11 | * Lesser General Public License for more details. | |
0f2d19dd | 12 | * |
73be1d9e MV |
13 | * You should have received a copy of the GNU Lesser General Public |
14 | * License along with this library; if not, write to the Free Software | |
15 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
16 | */ | |
1bbd0b84 | 17 | |
1bbd0b84 | 18 | |
0f2d19dd | 19 | \f |
fed43b8f RB |
20 | #if HAVE_CONFIG_H |
21 | # include <config.h> | |
22 | #endif | |
0f2d19dd JB |
23 | |
24 | #include <stdio.h> | |
e6e2e95a MD |
25 | #include <errno.h> |
26 | ||
a0599745 MD |
27 | #include "libguile/_scm.h" |
28 | #include "libguile/eval.h" | |
29 | #include "libguile/chars.h" | |
30 | #include "libguile/fports.h" | |
31 | #include "libguile/root.h" | |
32 | #include "libguile/strings.h" | |
33 | #include "libguile/vectors.h" | |
20e6290e | 34 | |
a0599745 MD |
35 | #include "libguile/validate.h" |
36 | #include "libguile/vports.h" | |
0f2d19dd | 37 | |
95b88819 GH |
38 | #ifdef HAVE_STRING_H |
39 | #include <string.h> | |
40 | #endif | |
41 | ||
0f2d19dd JB |
42 | \f |
43 | ||
44 | /* {Ports - soft ports} | |
45 | * | |
46 | */ | |
47 | ||
48 | ||
92c2555f | 49 | static scm_t_bits scm_tc16_sfport; |
a98bddfd DH |
50 | |
51 | ||
ee149d03 | 52 | static void |
affc96b5 | 53 | sf_flush (SCM port) |
0f2d19dd | 54 | { |
92c2555f | 55 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
74a16888 | 56 | SCM stream = SCM_PACK (pt->stream); |
ee149d03 JB |
57 | |
58 | if (pt->write_pos > pt->write_buf) | |
59 | { | |
840ae05d | 60 | /* write the byte. */ |
fdc28395 | 61 | scm_call_1 (SCM_VELTS (stream)[0], SCM_MAKE_CHAR (*pt->write_buf)); |
ee149d03 JB |
62 | pt->write_pos = pt->write_buf; |
63 | ||
64 | /* flush the output. */ | |
65 | { | |
66 | SCM f = SCM_VELTS (stream)[2]; | |
67 | ||
7888309b | 68 | if (scm_is_true (f)) |
fdc28395 | 69 | scm_call_0 (f); |
ee149d03 JB |
70 | } |
71 | } | |
0f2d19dd JB |
72 | } |
73 | ||
31703ab8 | 74 | static void |
8aa011a1 | 75 | sf_write (SCM port, const void *data, size_t size) |
31703ab8 | 76 | { |
74a16888 | 77 | SCM p = SCM_PACK (SCM_STREAM (port)); |
31703ab8 | 78 | |
cc95e00a | 79 | scm_call_1 (SCM_VELTS (p)[1], scm_from_locale_stringn ((char *) data, size)); |
31703ab8 | 80 | } |
1cc91f1b | 81 | |
ee149d03 JB |
82 | /* calling the flush proc (element 2) is in case old code needs it, |
83 | but perhaps softports could the use port buffer in the same way as | |
84 | fports. */ | |
85 | ||
affc96b5 | 86 | /* places a single char in the input buffer. */ |
0f2d19dd | 87 | static int |
affc96b5 | 88 | sf_fill_input (SCM port) |
0f2d19dd | 89 | { |
74a16888 | 90 | SCM p = SCM_PACK (SCM_STREAM (port)); |
0f2d19dd | 91 | SCM ans; |
ee149d03 | 92 | |
fdc28395 | 93 | ans = scm_call_0 (SCM_VELTS (p)[3]); /* get char. */ |
7888309b | 94 | if (scm_is_false (ans) || SCM_EOF_OBJECT_P (ans)) |
0f2d19dd | 95 | return EOF; |
7866a09b | 96 | SCM_ASSERT (SCM_CHARP (ans), ans, SCM_ARG1, "sf_fill_input"); |
5c070ca7 | 97 | { |
92c2555f | 98 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
5c070ca7 | 99 | |
7866a09b | 100 | *pt->read_buf = SCM_CHAR (ans); |
5c070ca7 GH |
101 | pt->read_pos = pt->read_buf; |
102 | pt->read_end = pt->read_buf + 1; | |
103 | return *pt->read_buf; | |
104 | } | |
0f2d19dd JB |
105 | } |
106 | ||
1cc91f1b | 107 | |
0f2d19dd | 108 | static int |
affc96b5 | 109 | sf_close (SCM port) |
0f2d19dd | 110 | { |
74a16888 | 111 | SCM p = SCM_PACK (SCM_STREAM (port)); |
0f2d19dd | 112 | SCM f = SCM_VELTS (p)[4]; |
7888309b | 113 | if (scm_is_false (f)) |
0f2d19dd | 114 | return 0; |
fdc28395 | 115 | f = scm_call_0 (f); |
0f2d19dd | 116 | errno = 0; |
7888309b | 117 | return scm_is_false (f) ? EOF : 0; |
0f2d19dd JB |
118 | } |
119 | ||
120 | ||
34010f56 NJ |
121 | static int |
122 | sf_input_waiting (SCM port) | |
123 | { | |
124 | SCM p = SCM_PACK (SCM_STREAM (port)); | |
125 | if (SCM_VECTOR_LENGTH (p) >= 6) | |
126 | { | |
127 | SCM f = SCM_VELTS (p)[5]; | |
7888309b | 128 | if (scm_is_true (f)) |
b9bd8526 | 129 | return scm_to_int (scm_call_0 (f)); |
34010f56 NJ |
130 | } |
131 | /* Default is such that char-ready? for soft ports returns #t, as it | |
132 | did before this extension was implemented. */ | |
133 | return 1; | |
134 | } | |
135 | ||
136 | ||
0f2d19dd | 137 | |
3b3b36dd | 138 | SCM_DEFINE (scm_make_soft_port, "make-soft-port", 2, 0, 0, |
1bbd0b84 | 139 | (SCM pv, SCM modes), |
1e6808ea | 140 | "Return a port capable of receiving or delivering characters as\n" |
d3818c29 | 141 | "specified by the @var{modes} string (@pxref{File Ports,\n" |
34010f56 | 142 | "open-file}). @var{pv} must be a vector of length 5 or 6. Its\n" |
1e6808ea MG |
143 | "components are as follows:\n" |
144 | "\n" | |
d3818c29 MD |
145 | "@enumerate 0\n" |
146 | "@item\n" | |
147 | "procedure accepting one character for output\n" | |
148 | "@item\n" | |
149 | "procedure accepting a string for output\n" | |
150 | "@item\n" | |
151 | "thunk for flushing output\n" | |
152 | "@item\n" | |
153 | "thunk for getting one character\n" | |
154 | "@item\n" | |
155 | "thunk for closing port (not by garbage collection)\n" | |
34010f56 NJ |
156 | "@item\n" |
157 | "(if present and not @code{#f}) thunk for computing the number of\n" | |
158 | "characters that can be read from the port without blocking.\n" | |
1e6808ea MG |
159 | "@end enumerate\n" |
160 | "\n" | |
d3818c29 | 161 | "For an output-only port only elements 0, 1, 2, and 4 need be\n" |
1e6808ea MG |
162 | "procedures. For an input-only port only elements 3 and 4 need\n" |
163 | "be procedures. Thunks 2 and 4 can instead be @code{#f} if\n" | |
164 | "there is no useful operation for them to perform.\n" | |
165 | "\n" | |
166 | "If thunk 3 returns @code{#f} or an @code{eof-object}\n" | |
7a095584 | 167 | "(@pxref{Input, eof-object?, ,r5rs, The Revised^5 Report on\n" |
1e6808ea MG |
168 | "Scheme}) it indicates that the port has reached end-of-file.\n" |
169 | "For example:\n" | |
170 | "\n" | |
171 | "@lisp\n" | |
d3818c29 MD |
172 | "(define stdout (current-output-port))\n" |
173 | "(define p (make-soft-port\n" | |
174 | " (vector\n" | |
175 | " (lambda (c) (write c stdout))\n" | |
176 | " (lambda (s) (display s stdout))\n" | |
177 | " (lambda () (display \".\" stdout))\n" | |
178 | " (lambda () (char-upcase (read-char)))\n" | |
179 | " (lambda () (display \"@@\" stdout)))\n" | |
1e6808ea MG |
180 | " \"rw\"))\n" |
181 | "\n" | |
ee826bae | 182 | "(write p p) @result{} #<input-output: soft 8081e20>\n" |
1e6808ea | 183 | "@end lisp") |
1bbd0b84 | 184 | #define FUNC_NAME s_scm_make_soft_port |
0f2d19dd | 185 | { |
34010f56 | 186 | int vlen; |
92c2555f | 187 | scm_t_port *pt; |
0f2d19dd | 188 | SCM z; |
34010f56 NJ |
189 | |
190 | SCM_VALIDATE_VECTOR (1, pv); | |
191 | vlen = SCM_VECTOR_LENGTH (pv); | |
192 | SCM_ASSERT ((vlen == 5) || (vlen == 6), pv, 1, FUNC_NAME); | |
a6d9e5ab | 193 | SCM_VALIDATE_STRING (2, modes); |
402788a9 | 194 | |
b9ad392e | 195 | scm_mutex_lock (&scm_i_port_table_mutex); |
da220f27 | 196 | z = scm_new_port_table_entry (scm_tc16_sfport); |
f07c886a | 197 | pt = SCM_PTAB_ENTRY (z); |
70df8af6 | 198 | scm_port_non_buffer (pt); |
d617ee18 | 199 | SCM_SET_CELL_TYPE (z, scm_tc16_sfport | scm_i_mode_bits (modes)); |
da220f27 | 200 | |
74a16888 | 201 | SCM_SETSTREAM (z, SCM_UNPACK (pv)); |
b9ad392e | 202 | scm_mutex_unlock (&scm_i_port_table_mutex); |
0f2d19dd JB |
203 | return z; |
204 | } | |
1bbd0b84 | 205 | #undef FUNC_NAME |
0f2d19dd | 206 | |
1cc91f1b | 207 | |
92c2555f | 208 | static scm_t_bits |
10efca5b | 209 | scm_make_sfptob () |
0f2d19dd | 210 | { |
92c2555f | 211 | scm_t_bits tc = scm_make_port_type ("soft", sf_fill_input, sf_write); |
a98bddfd | 212 | |
6c747373 | 213 | scm_set_port_mark (tc, scm_markstream); |
affc96b5 GH |
214 | scm_set_port_flush (tc, sf_flush); |
215 | scm_set_port_close (tc, sf_close); | |
34010f56 | 216 | scm_set_port_input_waiting (tc, sf_input_waiting); |
a98bddfd DH |
217 | |
218 | return tc; | |
10efca5b | 219 | } |
1cc91f1b | 220 | |
0f2d19dd JB |
221 | void |
222 | scm_init_vports () | |
0f2d19dd | 223 | { |
a98bddfd DH |
224 | scm_tc16_sfport = scm_make_sfptob (); |
225 | ||
a0599745 | 226 | #include "libguile/vports.x" |
0f2d19dd | 227 | } |
89e00824 ML |
228 | |
229 | /* | |
230 | Local Variables: | |
231 | c-file-style: "gnu" | |
232 | End: | |
233 | */ |