2 * QEMU Char Device for testsuite control
4 * Copyright (c) 2014 Red Hat, Inc.
6 * Author: Paolo Bonzini <pbonzini@redhat.com>
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
27 #include "qemu/osdep.h"
28 #include "qemu/module.h"
29 #include "chardev/char.h"
40 #define TYPE_CHARDEV_TESTDEV "chardev-testdev"
41 #define TESTDEV_CHARDEV(obj) \
42 OBJECT_CHECK(TestdevChardev, (obj), TYPE_CHARDEV_TESTDEV)
44 /* Try to interpret a whole incoming packet */
45 static int testdev_eat_packet(TestdevChardev
*testdev
)
47 const uint8_t *cur
= testdev
->in_buf
;
48 int len
= testdev
->in_buf_used
;
67 arg
= arg
* 10 + c
- '0';
82 return cur
- testdev
->in_buf
;
85 /* The other end is writing some data. Store it and try to interpret */
86 static int testdev_chr_write(Chardev
*chr
, const uint8_t *buf
, int len
)
88 TestdevChardev
*testdev
= TESTDEV_CHARDEV(chr
);
89 int tocopy
, eaten
, orig_len
= len
;
92 /* Complete our buffer as much as possible */
93 tocopy
= MIN(len
, BUF_SIZE
- testdev
->in_buf_used
);
95 memcpy(testdev
->in_buf
+ testdev
->in_buf_used
, buf
, tocopy
);
96 testdev
->in_buf_used
+= tocopy
;
100 /* Interpret it as much as possible */
101 while (testdev
->in_buf_used
> 0 &&
102 (eaten
= testdev_eat_packet(testdev
)) > 0) {
103 memmove(testdev
->in_buf
, testdev
->in_buf
+ eaten
,
104 testdev
->in_buf_used
- eaten
);
105 testdev
->in_buf_used
-= eaten
;
111 static void char_testdev_class_init(ObjectClass
*oc
, void *data
)
113 ChardevClass
*cc
= CHARDEV_CLASS(oc
);
115 cc
->chr_write
= testdev_chr_write
;
118 static const TypeInfo char_testdev_type_info
= {
119 .name
= TYPE_CHARDEV_TESTDEV
,
120 .parent
= TYPE_CHARDEV
,
121 .instance_size
= sizeof(TestdevChardev
),
122 .class_init
= char_testdev_class_init
,
125 static void register_types(void)
127 type_register_static(&char_testdev_type_info
);
130 type_init(register_types
);