/*
* Initialize the internals of an sbuf.
* If buf is non-NULL, it points to a static or already-allocated string
* big enough to hold at least length characters.
*/
static struct sbuf *
sbuf_newbuf(struct sbuf *s, char *buf, int length, int flags)
{
memset(s, 0, sizeof(*s));
s->s_flags = flags;
s->s_size = length;
s->s_buf = buf;
if ((s->s_flags & SBUF_AUTOEXTEND) == 0) {
KASSERT(s->s_size >= 0,
("attempt to create a too small sbuf"));
}
if (s->s_buf != NULL)
return (s);
if ((flags & SBUF_AUTOEXTEND) != 0)
s->s_size = sbuf_extendsize(s->s_size);
s->s_buf = SBMALLOC(s->s_size);
if (s->s_buf == NULL)
return (NULL);
SBUF_SETFLAG(s, SBUF_DYNAMIC);
return (s);
}
/*
* Initialize an sbuf.
* If buf is non-NULL, it points to a static or already-allocated string
* big enough to hold at least length characters.
*/
struct sbuf *
sbuf_new(struct sbuf *s, char *buf, int length, int flags)
{
KASSERT(length >= 0);
KASSERT((flags & ~SBUF_USRFLAGMSK) == 0);
flags &= SBUF_USRFLAGMSK;
if (s == NULL) {
s = (struct sbuf *)SBMALLOC(sizeof *s);
if (s == NULL)
return (NULL);
bzero(s, sizeof *s);
s->s_flags = flags;
SBUF_SETFLAG(s, SBUF_DYNSTRUCT);
} else {
bzero(s, sizeof *s);
s->s_flags = flags;
}
s->s_size = length;
if (buf) {
s->s_buf = buf;
return (s);
}
if (flags & SBUF_AUTOEXTEND)
s->s_size = sbuf_extendsize(s->s_size);
s->s_buf = (char *)SBMALLOC(s->s_size);
if (s->s_buf == NULL) {
if (SBUF_ISDYNSTRUCT(s))
SBFREE(s);
return (NULL);
}
SBUF_SETFLAG(s, SBUF_DYNAMIC);
return (s);
}
/*
* Extend an sbuf.
*/
static int
sbuf_extend(struct sbuf *s, int addlen)
{
char *newbuf;
int newsize;
if (!SBUF_CANEXTEND(s))
return (-1);
newsize = sbuf_extendsize(s->s_size + addlen);
newbuf = SBMALLOC(newsize);
if (newbuf == NULL)
return (-1);
memcpy(newbuf, s->s_buf, s->s_size);
if (SBUF_ISDYNAMIC(s))
SBFREE(s->s_buf);
else
SBUF_SETFLAG(s, SBUF_DYNAMIC);
s->s_buf = newbuf;
s->s_size = newsize;
return (0);
}
/*
* Initialize an sbuf.
* If buf is non-NULL, it points to a static or already-allocated string
* big enough to hold at least length characters.
*/
struct sbuf *
sbuf_new(struct sbuf *s, char *buf, int length, int flags)
{
KASSERT(length >= 0,
("attempt to create an sbuf of negative length (%d)", length));
KASSERT((flags & ~SBUF_USRFLAGMSK) == 0,
("%s called with invalid flags", __func__));
flags &= SBUF_USRFLAGMSK;
if (s == NULL) {
s = SBMALLOC(sizeof(*s));
if (s == NULL)
return (NULL);
bzero(s, sizeof(*s));
s->s_flags = flags;
SBUF_SETFLAG(s, SBUF_DYNSTRUCT);
} else {
bzero(s, sizeof(*s));
s->s_flags = flags;
}
s->s_size = length;
if (buf) {
s->s_buf = buf;
return (s);
}
if (flags & SBUF_AUTOEXTEND)
s->s_size = sbuf_extendsize(s->s_size);
s->s_buf = SBMALLOC(s->s_size);
if (s->s_buf == NULL) {
if (SBUF_ISDYNSTRUCT(s))
SBFREE(s);
return (NULL);
}
SBUF_SETFLAG(s, SBUF_DYNAMIC);
return (s);
}
