summaryrefslogtreecommitdiff
blob: 203adcfa4182d7d45a3578b94b0ab623c1e554c2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
/* Copyright (C) 2001-2019 Artifex Software, Inc.
   All Rights Reserved.

   This software is provided AS-IS with no warranty, either express or
   implied.

   This software is distributed under license and may not be copied,
   modified or distributed except as expressly authorized under the terms
   of the license contained in the file LICENSE in this distribution.

   Refer to licensing information at http://www.artifex.com or contact
   Artifex Software, Inc.,  1305 Grant Avenue - Suite 200, Novato,
   CA 94945, U.S.A., +1(415)492-9861, for further information.
*/


/* %stdxxx IODevice implementation using callouts for PostScript interpreter */
#include "stdio_.h"
#include "ghost.h"
#include "gpcheck.h"
#include "gp.h"
#include "oper.h"
#include "stream.h"
#include "gxiodev.h"		/* must come after stream.h */
                                /* and before files.h */
#include "istream.h"
#include "files.h"
#include "ifilter.h"
#include "store.h"

/* Define the special devices. */
const char iodev_dtype_stdio[] = "Special";
#define iodev_special(dname, init, finit, open) {\
    dname, iodev_dtype_stdio,\
        { init, finit, open, iodev_no_open_file, iodev_no_fopen, iodev_no_fclose,\
          iodev_no_delete_file, iodev_no_rename_file, iodev_no_file_status,\
          iodev_no_enumerate_files, NULL, NULL,\
          iodev_no_get_params, iodev_no_put_params\
        }, \
        NULL, \
        NULL \
}

/*
 * We need the current context pointer for accessing / opening the %std
 * IODevices.  However, this is not available to the open routine.
 * Therefore, we use the hack of storing this pointer in the IODevice state
 * pointer just before calling the open routines.  We clear the pointer
 * immediately afterwards so as not to wind up with dangling references.
 */

#define STDIN_BUF_SIZE 1024
static iodev_proc_init(stdin_init);
static iodev_proc_finit(stdin_finit);
static iodev_proc_open_device(stdin_open);
const gx_io_device gs_iodev_stdin =
    iodev_special("%stdin%", stdin_init, stdin_finit, stdin_open);

#define STDOUT_BUF_SIZE 128
static iodev_proc_open_device(stdout_open);
const gx_io_device gs_iodev_stdout =
    iodev_special("%stdout%", iodev_no_init, iodev_no_finit, stdout_open);

#define STDERR_BUF_SIZE 128
static iodev_proc_open_device(stderr_open);
const gx_io_device gs_iodev_stderr =
    iodev_special("%stderr%", iodev_no_init, iodev_no_finit, stderr_open);

/* ------- %stdin, %stdout, and %stderr ------ */

/*
 * According to Adobe, it is legal to close the %std... files and then
 * re-open them later.  However, the re-opened file object is not 'eq' to
 * the original file object (in our implementation, it has a different
 * read_id or write_id). This is performed in 'file_close_file' by the
 * call to file_close_disable.
 */

static int
stdin_init(gx_io_device * iodev, gs_memory_t * mem)
{
    mem->gs_lib_ctx->core->stdin_is_interactive = true;
    return 0;
}

static void
stdin_finit(gx_io_device * iodev, gs_memory_t * mem)
{
    mem->gs_lib_ctx->core->stdin_is_interactive = false;
    return;
}

/* Read from stdin into the buffer. */
/* If interactive, only read one character. */
static int
s_stdin_read_process(stream_state * st, stream_cursor_read * ignore_pr,
                     stream_cursor_write * pw, bool last)
{
    int wcount = (int)(pw->limit - pw->ptr);
    int count;
    gs_memory_t *mem = st->memory;
    gs_lib_ctx_core_t *core = mem->gs_lib_ctx->core;

    if (wcount <= 0)
        return 0;

    /* do the callout */
    if (core->stdin_fn)
        count = (*core->stdin_fn)
            (core->caller_handle, (char *)pw->ptr + 1,
             core->stdin_is_interactive ? 1 : wcount);
    else
        count = gp_stdin_read((char *)pw->ptr + 1, wcount,
                      core->stdin_is_interactive,
                      core->fstdin);

    pw->ptr += (count < 0) ? 0 : count;
    return ((count < 0) ? ERRC : (count == 0) ? EOFC : count);
}

static int
stdin_open(gx_io_device * iodev, const char *access, stream ** ps,
           gs_memory_t * mem)
{
    i_ctx_t *i_ctx_p = (i_ctx_t *)iodev->state;	/* see above */
    stream *s;

    if (!streq1(access, 'r'))
        return_error(gs_error_invalidfileaccess);
    if (file_is_invalid(s, &ref_stdin)) {
        /****** stdin SHOULD NOT LINE-BUFFER ******/
        gs_memory_t *sysmem = imemory_system;
        byte *buf;
        static const stream_procs p = {
            s_std_noavailable, s_std_noseek, s_std_read_reset,
            s_std_read_flush, file_close_file, s_stdin_read_process
        };

        s = file_alloc_stream(sysmem, "stdin_open(stream)");

        /* We want stdin to read only one character at a time, */
        /* but it must have a substantial buffer, in case it is used */
        /* by a stream that requires more than one input byte */
        /* to make progress. */
        buf = gs_alloc_bytes(sysmem, STDIN_BUF_SIZE, "stdin_open(buffer)");
        if (s == 0 || buf == 0)
            return_error(gs_error_VMerror);

        s_std_init(s, buf, STDIN_BUF_SIZE, &p, s_mode_read);
        s->file = 0;
        s->file_modes = s->modes;
        s->file_offset = 0;
        s->file_limit = S_FILE_LIMIT_MAX;
        s->save_close = s_std_null;
        make_file(&ref_stdin, a_readonly | avm_system, s->read_id, s);
        *ps = s;
        return 1;
    }
    *ps = s;
    return 0;
}
/* This is the public routine for getting the stdin stream. */
int
zget_stdin(i_ctx_t *i_ctx_p, stream ** ps)
{
    stream *s;
    gx_io_device *iodev;
    int code;

    if (file_is_valid(s, &ref_stdin)) {
        *ps = s;
        return 0;
    }
    iodev = gs_findiodevice(imemory, (const byte *)"%stdin", 6);
    iodev->state = i_ctx_p;
    code = (*iodev->procs.open_device)(iodev, "r", ps, imemory_system);
    iodev->state = NULL;
    return min(code, 0);
}

/* Test whether a stream is stdin. */
bool
zis_stdin(const stream *s)
{
    return (s_is_valid(s) && s->procs.process == s_stdin_read_process);
}

/* Write a buffer to stdout, potentially writing to callback */
static int
s_stdout_write_process(stream_state * st, stream_cursor_read *pr,
                     stream_cursor_write *ignore_pw, bool last)
{
    uint count = pr->limit - pr->ptr;
    int written;

    if (count == 0)
        return 0;
    written = outwrite(st->memory, (const char *)pr->ptr + 1, count);
    if (written < count)
        return ERRC;
    pr->ptr += written;
    return 0;
}

static int
stdout_open(gx_io_device * iodev, const char *access, stream ** ps,
            gs_memory_t * mem)
{
    i_ctx_t *i_ctx_p = (i_ctx_t *)iodev->state;	/* see above */
    stream *s;

    if (!streq1(access, 'w'))
        return_error(gs_error_invalidfileaccess);
    if (file_is_invalid(s, &ref_stdout)) {
        gs_memory_t *sysmem = imemory_system;
        byte *buf;
        static const stream_procs p = {
            s_std_noavailable, s_std_noseek, s_std_write_reset,
            s_std_write_flush, file_close_file, s_stdout_write_process
        };

        s = file_alloc_stream(sysmem, "stdout_open(stream)");
        buf = gs_alloc_bytes(sysmem, STDOUT_BUF_SIZE, "stdout_open(buffer)");
        if (s == 0 || buf == 0)
            return_error(gs_error_VMerror);
        s_std_init(s, buf, STDOUT_BUF_SIZE, &p, s_mode_write);
        s->file = 0;
        s->file_modes = s->modes;
        s->file_offset = 0;		/* in case we switch to reading later */
        s->file_limit = S_FILE_LIMIT_MAX;
        s->save_close = s->procs.flush;
        make_file(&ref_stdout, a_write | avm_system, s->write_id, s);
        *ps = s;
        return 1;
    }
    *ps = s;
    return 0;
}

/* This is the public routine for getting the stdout stream. */
int
zget_stdout(i_ctx_t *i_ctx_p, stream ** ps)
{
    stream *s;
    gx_io_device *iodev;
    int code;

    if (file_is_valid(s, &ref_stdout)) {
        *ps = s;
        return 0;
    }
    iodev = gs_findiodevice(imemory, (const byte *)"%stdout", 7);
    iodev->state = i_ctx_p;
    code = (*iodev->procs.open_device)(iodev, "w", ps, imemory_system);
    iodev->state = NULL;
    return min(code, 0);
}

/* Write a buffer to stderr, potentially writing to callback */
static int
s_stderr_write_process(stream_state * st, stream_cursor_read *pr,
                     stream_cursor_write *ignore_pw, bool last)
{
    uint count = pr->limit - pr->ptr;
    int written;

    if (count == 0)
        return 0;
    written = errwrite(st->memory, (const char *)(pr->ptr + 1), count);
    if (written < count)
        return ERRC;
    pr->ptr += written;
    return 0;
}

static int
stderr_open(gx_io_device * iodev, const char *access, stream ** ps,
            gs_memory_t * mem)
{
    i_ctx_t *i_ctx_p = (i_ctx_t *)iodev->state;	/* see above */
    stream *s;

    if (!streq1(access, 'w'))
        return_error(gs_error_invalidfileaccess);
    if (file_is_invalid(s, &ref_stderr)) {
        gs_memory_t *sysmem = imemory_system;
        byte *buf;
        static const stream_procs p = {
            s_std_noavailable, s_std_noseek, s_std_write_reset,
            s_std_write_flush, file_close_file, s_stderr_write_process
        };

        s = file_alloc_stream(sysmem, "stderr_open(stream)");
        buf = gs_alloc_bytes(sysmem, STDERR_BUF_SIZE, "stderr_open(buffer)");
        if (s == 0 || buf == 0)
            return_error(gs_error_VMerror);
        s_std_init(s, buf, STDERR_BUF_SIZE, &p, s_mode_write);
        s->file = 0;
        s->file_modes = s->modes;
        s->file_offset = 0;		/* in case we switch to reading later */
        s->file_limit = S_FILE_LIMIT_MAX;
        s->save_close = s->procs.flush;
        make_file(&ref_stderr, a_write | avm_system, s->write_id, s);
        *ps = s;
        return 1;
    }
    *ps = s;
    return 0;
}

/* This is the public routine for getting the stderr stream. */
int
zget_stderr(i_ctx_t *i_ctx_p, stream ** ps)
{
    stream *s;
    gx_io_device *iodev;
    int code;

    if (file_is_valid(s, &ref_stderr)) {
        *ps = s;
        return 0;
    }
    iodev = gs_findiodevice(imemory, (const byte *)"%stderr", 7);
    iodev->state = i_ctx_p;
    code = (*iodev->procs.open_device)(iodev, "w", ps, imemory_system);
    iodev->state = NULL;
    return min(code, 0);
}