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Fix rotbuf_advance(), add rotbuf_remain()

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This commit is contained in:
Andrew Bettison 2013-04-30 17:28:32 +09:30
parent ba57855160
commit 74c82648f2
1 changed files with 23 additions and 5 deletions
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26
rotbuf.h
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@ -109,6 +109,20 @@ __ROTBUF_INLINE size_t rotbuf_position(struct rotbuf *rb)
return (rb->cursor - rb->buf) + (rb->ebuf - rb->start);
}
/* Return the total number of bytes remaining to be advanced to reach the end
* of the given rotated buffer. If the buffer has overrun, this will be zero.
*
* @author Andrew Bettison <andrew@servalproject.com>
*/
__ROTBUF_INLINE size_t rotbuf_remain(struct rotbuf *rb)
{
if (rb->wrap)
return 0;
if (rb->cursor < rb->start)
return rb->start - rb->cursor;
return (rb->ebuf - rb->cursor) + (rb->start - rb->buf);
}
/* Return the total number of bytes advanced through the given rotated buffer, including any
* overrun.
*
@ -132,14 +146,18 @@ __ROTBUF_INLINE void rotbuf_advance(struct rotbuf *rb, size_t len)
if (rb->wrap)
rb->wrap += len;
else if (len) {
rb->cursor += len;
if (rb->cursor >= rb->ebuf) {
rb->cursor -= rb->buf - rb->ebuf;
if (rb->cursor >= rb->start) {
rb->wrap = 1 + rb->cursor - rb->start;
if ((rb->cursor += len) >= rb->ebuf) {
rb->cursor -= rb->ebuf - rb->buf;
if (rb->cursor >= rb->start) {
rb->wrap = 1 + (rb->cursor - rb->start);
rb->cursor = rb->start;
}
}
} else if ((rb->cursor += len) >= rb->start) {
rb->wrap = 1 + (rb->cursor - rb->start);
rb->cursor = rb->start;
}
}
}