home *** CD-ROM | disk | FTP | other *** search
- /* Copyright (C) 2000 Aladdin Enterprises. All rights reserved.
-
- This file is part of AFPL Ghostscript.
-
- AFPL Ghostscript is distributed with NO WARRANTY OF ANY KIND. No author or
- distributor accepts any responsibility for the consequences of using it, or
- for whether it serves any particular purpose or works at all, unless he or
- she says so in writing. Refer to the Aladdin Free Public License (the
- "License") for full details.
-
- Every copy of AFPL Ghostscript must include a copy of the License, normally
- in a plain ASCII text file named PUBLIC. The License grants you the right
- to copy, modify and redistribute AFPL Ghostscript, but only under certain
- conditions described in the License. Among other things, the License
- requires that the copyright notice and this notice be preserved on all
- copies.
- */
-
- /*$Id: ziodevs.c,v 1.2 2000/09/19 19:00:54 lpd Exp $ */
- /* %stdxxx IODevice implementation for PostScript interpreter */
- #include "stdio_.h"
- #include "ghost.h"
- #include "gpcheck.h"
- #include "oper.h"
- #include "stream.h"
- #include "gxiodev.h" /* must come after stream.h */
- /* and before files.h */
- #include "files.h"
- #include "store.h"
-
- /* Define the special devices. */
- const char iodev_dtype_stdio[] = "Special";
- #define iodev_special(dname, init, open) {\
- dname, iodev_dtype_stdio,\
- { init, 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\
- }\
- }
-
- /*
- * 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 128
- /*#define ref_stdin ref_stdio[0] *//* in files.h */
- bool gs_stdin_is_interactive; /* exported for command line only */
- private iodev_proc_init(stdin_init);
- private iodev_proc_open_device(stdin_open);
- const gx_io_device gs_iodev_stdin =
- iodev_special("%stdin%", stdin_init, stdin_open);
-
- #define STDOUT_BUF_SIZE 128
- /*#define ref_stdout ref_stdio[1] *//* in files.h */
- private iodev_proc_open_device(stdout_open);
- const gx_io_device gs_iodev_stdout =
- iodev_special("%stdout%", iodev_no_init, stdout_open);
-
- #define STDERR_BUF_SIZE 128
- /*#define ref_stderr ref_stdio[2] *//* in files.h */
- private iodev_proc_open_device(stderr_open);
- const gx_io_device gs_iodev_stderr =
- iodev_special("%stderr%", iodev_no_init, 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).
- */
-
- private int
- s_stdin_read_process(P4(stream_state *, stream_cursor_read *,
- stream_cursor_write *, bool));
-
- private int
- stdin_init(gx_io_device * iodev, gs_memory_t * mem)
- {
- gs_stdin_is_interactive = true;
- return 0;
- }
-
- /* Read from stdin into the buffer. */
- /* If interactive, only read one character. */
- private int
- s_stdin_read_process(stream_state * st, stream_cursor_read * ignore_pr,
- stream_cursor_write * pw, bool last)
- {
- FILE *file = ((stream *) st)->file; /* hack for file streams */
- int wcount = (int)(pw->limit - pw->ptr);
- int count;
-
- if (wcount > 0) {
- if (gs_stdin_is_interactive)
- wcount = 1;
- count = fread(pw->ptr + 1, 1, wcount, file);
- if (count < 0)
- count = 0;
- pw->ptr += count;
- } else
- count = 0; /* return 1 if no error/EOF */
- process_interrupts();
- return (ferror(file) ? ERRC : feof(file) ? EOFC : count == wcount ? 1 : 0);
- }
-
- private 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(e_invalidfileaccess);
- if (file_is_invalid(s, &ref_stdin)) {
- /****** stdin SHOULD NOT LINE-BUFFER ******/
- gs_memory_t *mem = imemory_system;
- byte *buf;
-
- s = file_alloc_stream(mem, "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(mem, STDIN_BUF_SIZE, "stdin_open(buffer)");
- if (s == 0 || buf == 0)
- return_error(e_VMerror);
- sread_file(s, gs_stdin, buf, STDIN_BUF_SIZE);
- s->procs.process = s_stdin_read_process;
- s->save_close = s_std_null;
- s->procs.close = file_close_file;
- 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((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);
- }
-
- private 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(e_invalidfileaccess);
- if (file_is_invalid(s, &ref_stdout)) {
- gs_memory_t *mem = imemory_system;
- byte *buf;
-
- s = file_alloc_stream(mem, "stdout_open(stream)");
- buf = gs_alloc_bytes(mem, STDOUT_BUF_SIZE, "stdout_open(buffer)");
- if (s == 0 || buf == 0)
- return_error(e_VMerror);
- swrite_file(s, gs_stdout, buf, STDOUT_BUF_SIZE);
- s->save_close = s->procs.flush;
- s->procs.close = file_close_file;
- 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((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);
- }
-
- private 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(e_invalidfileaccess);
- if (file_is_invalid(s, &ref_stderr)) {
- gs_memory_t *mem = imemory_system;
- byte *buf;
-
- s = file_alloc_stream(mem, "stderr_open(stream)");
- buf = gs_alloc_bytes(mem, STDERR_BUF_SIZE, "stderr_open(buffer)");
- if (s == 0 || buf == 0)
- return_error(e_VMerror);
- swrite_file(s, gs_stderr, buf, STDERR_BUF_SIZE);
- s->save_close = s->procs.flush;
- s->procs.close = file_close_file;
- 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((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);
- }
-