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Make the msg_size, msg_bufx and msg_bufr memebers of struct msgbuf

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signed, since they describe a ring buffer and signed arithmetic is
performed on them. This avoids some evilish casts.

Since this changes all but two members of this structure, style(9)
those remaining ones, too.

Requested by:	bde
Reviewed by:	bde (earlier version)
This commit is contained in:
Thomas Moestl 2002-11-14 16:11:12 +00:00
parent 443f70e31a
commit 01ee43955c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=106917
3 changed files with 15 additions and 17 deletions
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15
sys/kern/subr_log.c
View File

@ -127,9 +127,7 @@ static int
logread(dev_t dev, struct uio *uio, int flag)
{
struct msgbuf *mbp = msgbufp;
long l;
int s;
int error = 0;
int error = 0, l, s;
s = splhigh();
while (mbp->msg_bufr == mbp->msg_bufx) {
@ -147,14 +145,14 @@ logread(dev_t dev, struct uio *uio, int flag)
logsoftc.sc_state &= ~LOG_RDWAIT;
while (uio->uio_resid > 0) {
l = (long)mbp->msg_bufx - mbp->msg_bufr;
l = mbp->msg_bufx - mbp->msg_bufr;
if (l < 0)
l = mbp->msg_size - mbp->msg_bufr;
l = min(l, uio->uio_resid);
l = imin(l, uio->uio_resid);
if (l == 0)
break;
error = uiomove((caddr_t)msgbufp->msg_ptr + mbp->msg_bufr,
(int)l, uio);
l, uio);
if (error)
break;
mbp->msg_bufr += l;
@ -210,15 +208,14 @@ logtimeout(void *arg)
static int
logioctl(dev_t dev, u_long com, caddr_t data, int flag, struct thread *td)
{
long l;
int s;
int l, s;
switch (com) {
/* return number of characters immediately available */
case FIONREAD:
s = splhigh();
l = (long)msgbufp->msg_bufx - msgbufp->msg_bufr;
l = msgbufp->msg_bufx - msgbufp->msg_bufr;
splx(s);
if (l < 0)
l += msgbufp->msg_size;

5
sys/kern/subr_prf.c
View File

@ -820,7 +820,7 @@ msgbufcopy(struct msgbuf *oldp)
}
void
msgbufinit(void *ptr, size_t size)
msgbufinit(void *ptr, int size)
{
char *cp;
static struct msgbuf *oldp = NULL;
@ -829,7 +829,8 @@ msgbufinit(void *ptr, size_t size)
cp = (char *)ptr;
msgbufp = (struct msgbuf *) (cp + size);
if (msgbufp->msg_magic != MSG_MAGIC || msgbufp->msg_size != size ||
msgbufp->msg_bufx >= size || msgbufp->msg_bufr >= size) {
msgbufp->msg_bufx >= size || msgbufp->msg_bufx < 0 ||
msgbufp->msg_bufr >= size || msgbufp->msg_bufr < 0) {
bzero(cp, size);
bzero(msgbufp, sizeof(*msgbufp));
msgbufp->msg_magic = MSG_MAGIC;

12
sys/sys/msgbuf.h
View File

@ -39,17 +39,17 @@
struct msgbuf {
#define MSG_MAGIC 0x063062
unsigned int msg_magic;
unsigned int msg_size; /* size of buffer area */
unsigned int msg_bufx; /* write pointer */
unsigned int msg_bufr; /* read pointer */
char * msg_ptr; /* pointer to buffer */
u_int msg_magic;
int msg_size; /* size of buffer area */
int msg_bufx; /* write pointer */
int msg_bufr; /* read pointer */
char *msg_ptr; /* pointer to buffer */
};
#ifdef _KERNEL
extern int msgbuftrigger;
extern struct msgbuf *msgbufp;
void msgbufinit(void *ptr, size_t size);
void msgbufinit(void *ptr, int size);
#if !defined(MSGBUF_SIZE)
#define MSGBUF_SIZE 32768