1 /* stdio on a Mach device port.
2 Translates \n to \r\n on output, echos and translates \r to \n on input.
3 Copyright (C) 1992-2013 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
22 #include <device/device.h>
28 devstream_write (void *cookie, const char *buffer, size_t n)
30 const device_t dev = (device_t) cookie;
32 int write_some (const char *p, size_t to_write)
41 if (thiswrite > IO_INBAND_MAX)
42 thiswrite = IO_INBAND_MAX;
44 if (err = device_write_inband (dev, 0, 0, p, thiswrite, &wrote))
56 static const char crlf[] = "\r\n";
57 return write_some (crlf, 2);
60 /* Search for newlines (LFs) in the buffer. */
62 const char *start = buffer, *p;
63 while ((p = memchr (start, '\n', n)) != NULL)
65 /* Found one. Write out through the preceding character,
66 and then write a CR/LF pair. */
68 if ((p > start && !write_some (start, p - start))
70 return (start - buffer) ?: -1;
76 /* Write the remainder of the buffer. */
77 if (write_some (start, n))
79 return (start - buffer) ?: -1;
83 devstream_read (void *cookie, char *buffer, size_t to_read)
85 const device_t dev = (device_t) cookie;
88 mach_msg_type_number_t nread = to_read;
90 err = device_read_inband (dev, 0, 0, to_read, buffer, &nread);
97 /* Translate CR to LF. */
100 for (p = memchr (buffer, '\r', nread); p;
101 p = memchr (p + 1, '\r', (buffer + nread) - (p + 1)))
105 /* Echo back what we read. */
106 (void) devstream_write (cookie, buffer, nread);
112 dealloc_ref (void *cookie)
114 if (mach_port_deallocate (mach_task_self (), (mach_port_t) cookie))
123 mach_open_devstream (mach_port_t dev, const char *mode)
127 if (mach_port_mod_refs (mach_task_self (), dev, MACH_PORT_RIGHT_SEND, 1))
133 stream = fopencookie ((void *) dev, mode,
134 (cookie_io_functions_t) { write: devstream_write,
135 read: devstream_read,
136 close: dealloc_ref });
139 mach_port_deallocate (mach_task_self (), dev);