136 lines
3.7 KiB
C
136 lines
3.7 KiB
C
/*
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* QEMU Char Device for testsuite control
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*
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* Copyright (c) 2014 Red Hat, Inc.
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*
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* Author: Paolo Bonzini <pbonzini@redhat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu-common.h"
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#include "sysemu/char.h"
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#define BUF_SIZE 32
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typedef struct {
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CharDriverState *chr;
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uint8_t in_buf[32];
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int in_buf_used;
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} TestdevCharState;
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/* Try to interpret a whole incoming packet */
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static int testdev_eat_packet(TestdevCharState *testdev)
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{
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const uint8_t *cur = testdev->in_buf;
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int len = testdev->in_buf_used;
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uint8_t c;
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int arg;
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#define EAT(c) do { \
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if (!len--) { \
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return 0; \
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} \
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c = *cur++; \
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} while (0)
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EAT(c);
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while (isspace(c)) {
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EAT(c);
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}
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arg = 0;
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while (isdigit(c)) {
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arg = arg * 10 + c - '0';
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EAT(c);
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}
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while (isspace(c)) {
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EAT(c);
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}
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switch (c) {
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case 'q':
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exit((arg << 1) | 1);
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break;
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default:
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break;
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}
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return cur - testdev->in_buf;
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}
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/* The other end is writing some data. Store it and try to interpret */
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static int testdev_write(CharDriverState *chr, const uint8_t *buf, int len)
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{
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TestdevCharState *testdev = chr->opaque;
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int tocopy, eaten, orig_len = len;
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while (len) {
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/* Complete our buffer as much as possible */
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tocopy = MIN(len, BUF_SIZE - testdev->in_buf_used);
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memcpy(testdev->in_buf + testdev->in_buf_used, buf, tocopy);
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testdev->in_buf_used += tocopy;
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buf += tocopy;
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len -= tocopy;
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/* Interpret it as much as possible */
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while (testdev->in_buf_used > 0 &&
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(eaten = testdev_eat_packet(testdev)) > 0) {
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memmove(testdev->in_buf, testdev->in_buf + eaten,
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testdev->in_buf_used - eaten);
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testdev->in_buf_used -= eaten;
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}
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}
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return orig_len;
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}
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static void testdev_close(struct CharDriverState *chr)
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{
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TestdevCharState *testdev = chr->opaque;
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g_free(testdev);
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}
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static CharDriverState *chr_testdev_init(const char *id,
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ChardevBackend *backend,
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ChardevReturn *ret,
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Error **errp)
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{
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TestdevCharState *testdev;
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CharDriverState *chr;
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testdev = g_new0(TestdevCharState, 1);
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testdev->chr = chr = g_new0(CharDriverState, 1);
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chr->opaque = testdev;
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chr->chr_write = testdev_write;
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chr->chr_close = testdev_close;
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return chr;
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}
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static void register_types(void)
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{
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register_char_driver("testdev", CHARDEV_BACKEND_KIND_TESTDEV, NULL,
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chr_testdev_init);
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}
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type_init(register_types);
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