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pxt-common-packages/cpptests/queue.cpp at master · microsoft/pxt-common-packages · GitHub
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#
include
<
stdint.h
>
#
include
<
stdio.h
>
#
include
<
string.h
>
#
include
<
stdlib.h
>
#
define
LOG_QUEUE_SIZE
256
class
LogQueue
{
void
writeCore
(
const
char
*buf,
int
len);
public:
int
ptr;
char
buffer[
LOG_QUEUE_SIZE
];
int
rdPtr;
int
numWrap;
LogQueue
();
int
write
(
const
char
*buf,
int
len);
int
read
(
char
*buf,
int
len);
};
LogQueue::LogQueue
() {
ptr =
0
;
rdPtr =
0
;
numWrap =
0
;
memset
(buffer,
0
,
sizeof
(buffer));
}
void
LogQueue::writeCore
(
const
char
*buf,
int
len) {
memcpy
(buffer + ptr, buf, len);
//
did we pass it?
if
(ptr < rdPtr && rdPtr <= ptr + len)
rdPtr = -
1
;
ptr += len;
}
int
LogQueue::read
(
char
*buf,
int
len) {
if
(rdPtr <
0
) {
if
(numWrap ==
0
) {
rdPtr =
0
;
}
else
{
rdPtr = ptr +
1
;
}
}
if
(rdPtr <= ptr) {
int
av = ptr - rdPtr;
if
(len > av)
len = av;
memcpy
(buf, buffer + rdPtr, len);
rdPtr += len;
}
else
{
int
latter =
sizeof
(buffer) - rdPtr;
if
(latter >= len) {
memcpy
(buf, buffer + rdPtr, len);
rdPtr += len;
}
else
{
memcpy
(buf, buffer + rdPtr, latter);
buf += latter;
int
len2 = len - latter;
if
(len2 > ptr)
len2 = ptr;
memcpy
(buf, buffer, len2);
rdPtr = len2;
len = latter + len2;
}
}
if
(rdPtr >= (
int
)
sizeof
(buffer))
rdPtr =
0
;
return
len;
}
int
LogQueue::write
(
const
char
*buf,
int
len) {
if
(len > (
int
)
sizeof
(buffer) /
2
)
return
-
1
;
int
left =
sizeof
(buffer) - ptr;
if
(left < len +
1
) {
writeCore
(buf, left);
buf += left;
len -= left;
ptr =
0
;
numWrap++;
if
(rdPtr ==
0
)
rdPtr = -
1
;
}
writeCore
(buf, len);
buffer[ptr] =
0
;
//
printf("write %d -> ptr=%d rd=%d\n", len, ptr, rdPtr);
return
0
;
}
static
uint32_t
getrand
(
int
max) {
//
see https://en.wikipedia.org/wiki/Xorshift
static
uint32_t
x =
0xf01ba80
;
x ^= x <<
13
;
x ^= x >>
17
;
x ^= x <<
5
;
return
x % max;
}
void
testQ
() {
LogQueue *q =
new
LogQueue
();
char
cache[
10
*
LOG_QUEUE_SIZE
];
char
buf[
LOG_QUEUE_SIZE
];
for
(
int
i =
0
; i <
1000000
; ++i) {
int
wrSize =
0
;
int
numWr =
getrand
(
LOG_QUEUE_SIZE
/
3
);
for
(
int
j =
0
; j < numWr; ++j) {
int
sz =
getrand
(
10
) +
1
;
if
(wrSize + sz > (
int
)
sizeof
(cache) -
10
)
break
;
for
(
int
k =
0
; k < sz; ++k)
cache[wrSize + k] =
getrand
(
32
) +
'
a
'
;
q->
write
(cache + wrSize, sz);
wrSize += sz;
}
int
off = wrSize - (
LOG_QUEUE_SIZE
-
1
);
if
(off <
0
) {
off =
0
;
}
else
{
wrSize -= off;
}
//
printf("test %d + %d p=%d rdPtr=%d\n", wrSize, off, q->ptr, q->rdPtr);
int
n =
0
;
if
(
getrand
(
2
) ==
0
) {
n = q->
read
(buf,
LOG_QUEUE_SIZE
);
}
else
{
for
(;;) {
int
k = q->
read
(buf + n,
getrand
(
10
) +
1
);
n += k;
if
(!k)
break
;
}
}
if
(n != wrSize) {
printf
(
"
size %d != %d
"
, n, wrSize);
exit
(
1
);
}
for
(
int
j =
0
; j < wrSize; ++j)
if
(cache[off + j] != buf[j]) {
printf
(
"
at %d %d != %d
"
, j, cache[off + j], buf[j]);
exit
(
1
);
}
}
}
int
main
() {
testQ
();
printf
(
"
OK
\n
"
);
}
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