ringbuf: get_{write,read}_vector returns total bytes in both vec elts
This will eliminate unnecessary calls to ringbuf_{read,write}_space git-svn-id: https://svn.musicpd.org/mpd/trunk@7389 09075e82-0dd4-0310-85a5-a0d7c8717e4f
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@ -224,7 +224,7 @@ void ringbuf_write_advance(struct ringbuf * rb, size_t cnt)
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* the readable data is in one segment the second segment has zero
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* length.
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*/
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void ringbuf_get_read_vector(const struct ringbuf * rb, struct iovec * vec)
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size_t ringbuf_get_read_vector(const struct ringbuf * rb, struct iovec * vec)
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{
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size_t free_cnt;
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size_t cnt2;
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@ -247,13 +247,13 @@ void ringbuf_get_read_vector(const struct ringbuf * rb, struct iovec * vec)
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vec[0].iov_len = rb->size - r;
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vec[1].iov_base = rb->buf;
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vec[1].iov_len = cnt2 & rb->size_mask;
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} else {
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/* Single part vector: just the rest of the buffer */
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vec[0].iov_base = rb->buf + r;
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vec[0].iov_len = free_cnt;
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vec[1].iov_len = 0;
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}
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return vec[0].iov_len + vec[1].iov_len;
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}
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/*
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@ -262,7 +262,7 @@ void ringbuf_get_read_vector(const struct ringbuf * rb, struct iovec * vec)
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* the writeable data is in one segment the second segment has zero
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* length.
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*/
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void ringbuf_get_write_vector(const struct ringbuf * rb, struct iovec * vec)
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size_t ringbuf_get_write_vector(const struct ringbuf * rb, struct iovec * vec)
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{
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size_t free_cnt;
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size_t cnt2;
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@ -292,5 +292,6 @@ void ringbuf_get_write_vector(const struct ringbuf * rb, struct iovec * vec)
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vec[0].iov_len = free_cnt;
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vec[1].iov_len = 0;
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}
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return vec[0].iov_len + vec[1].iov_len;
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}
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@ -85,8 +85,9 @@ void ringbuf_free(struct ringbuf * rb);
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* @param rb a pointer to the ringbuffer structure.
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* @param vec a pointer to a 2 element array of struct iovec.
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*
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* @return total number of bytes readable into both vec elements
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*/
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void ringbuf_get_read_vector(const struct ringbuf * rb, struct iovec * vec);
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size_t ringbuf_get_read_vector(const struct ringbuf * rb, struct iovec * vec);
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/**
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* Fill a data structure with a description of the current writable
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@ -106,8 +107,10 @@ void ringbuf_get_read_vector(const struct ringbuf * rb, struct iovec * vec);
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*
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* @param rb a pointer to the ringbuffer structure.
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* @param vec a pointer to a 2 element array of struct iovec.
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*
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* @return total number of bytes writable in both vec elements
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*/
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void ringbuf_get_write_vector(const struct ringbuf * rb, struct iovec * vec);
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size_t ringbuf_get_write_vector(const struct ringbuf * rb, struct iovec * vec);
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/**
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* Read data from the ringbuffer.
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