nbd: Simplify trace of client flags in negotiation
[qemu/ar7.git] / chardev / testdev.c
blob031e9a23e8b4e5d51b41e241a4671cd4fdaa413c
1 /*
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
24 * THE SOFTWARE.
26 #include "qemu/osdep.h"
27 #include "qemu-common.h"
28 #include "chardev/char.h"
30 #define BUF_SIZE 32
32 typedef struct {
33 Chardev parent;
35 uint8_t in_buf[32];
36 int in_buf_used;
37 } TestdevChardev;
39 #define TYPE_CHARDEV_TESTDEV "chardev-testdev"
40 #define TESTDEV_CHARDEV(obj) \
41 OBJECT_CHECK(TestdevChardev, (obj), TYPE_CHARDEV_TESTDEV)
43 /* Try to interpret a whole incoming packet */
44 static int testdev_eat_packet(TestdevChardev *testdev)
46 const uint8_t *cur = testdev->in_buf;
47 int len = testdev->in_buf_used;
48 uint8_t c;
49 int arg;
51 #define EAT(c) do { \
52 if (!len--) { \
53 return 0; \
54 } \
55 c = *cur++; \
56 } while (0)
58 EAT(c);
60 while (isspace(c)) {
61 EAT(c);
64 arg = 0;
65 while (isdigit(c)) {
66 arg = arg * 10 + c - '0';
67 EAT(c);
70 while (isspace(c)) {
71 EAT(c);
74 switch (c) {
75 case 'q':
76 exit((arg << 1) | 1);
77 break;
78 default:
79 break;
81 return cur - testdev->in_buf;
84 /* The other end is writing some data. Store it and try to interpret */
85 static int testdev_chr_write(Chardev *chr, const uint8_t *buf, int len)
87 TestdevChardev *testdev = TESTDEV_CHARDEV(chr);
88 int tocopy, eaten, orig_len = len;
90 while (len) {
91 /* Complete our buffer as much as possible */
92 tocopy = MIN(len, BUF_SIZE - testdev->in_buf_used);
94 memcpy(testdev->in_buf + testdev->in_buf_used, buf, tocopy);
95 testdev->in_buf_used += tocopy;
96 buf += tocopy;
97 len -= tocopy;
99 /* Interpret it as much as possible */
100 while (testdev->in_buf_used > 0 &&
101 (eaten = testdev_eat_packet(testdev)) > 0) {
102 memmove(testdev->in_buf, testdev->in_buf + eaten,
103 testdev->in_buf_used - eaten);
104 testdev->in_buf_used -= eaten;
107 return orig_len;
110 static void char_testdev_class_init(ObjectClass *oc, void *data)
112 ChardevClass *cc = CHARDEV_CLASS(oc);
114 cc->chr_write = testdev_chr_write;
117 static const TypeInfo char_testdev_type_info = {
118 .name = TYPE_CHARDEV_TESTDEV,
119 .parent = TYPE_CHARDEV,
120 .instance_size = sizeof(TestdevChardev),
121 .class_init = char_testdev_class_init,
124 static void register_types(void)
126 type_register_static(&char_testdev_type_info);
129 type_init(register_types);