diff options
| -rw-r--r-- | include/qemu/iov.h | 34 | ||||
| -rw-r--r-- | util/iov.c | 8 |
2 files changed, 34 insertions, 8 deletions
diff --git a/include/qemu/iov.h b/include/qemu/iov.h index 569b2c2a23..28475516eb 100644 --- a/include/qemu/iov.h +++ b/include/qemu/iov.h @@ -39,10 +39,36 @@ size_t iov_size(const struct iovec *iov, const unsigned int iov_cnt); * such "large" value is -1 (sinice size_t is unsigned), * so specifying `-1' as `bytes' means 'up to the end of iovec'. */ -size_t iov_from_buf(const struct iovec *iov, unsigned int iov_cnt, - size_t offset, const void *buf, size_t bytes); -size_t iov_to_buf(const struct iovec *iov, const unsigned int iov_cnt, - size_t offset, void *buf, size_t bytes); +size_t iov_from_buf_full(const struct iovec *iov, unsigned int iov_cnt, + size_t offset, const void *buf, size_t bytes); +size_t iov_to_buf_full(const struct iovec *iov, const unsigned int iov_cnt, + size_t offset, void *buf, size_t bytes); + +static inline size_t +iov_from_buf(const struct iovec *iov, unsigned int iov_cnt, + size_t offset, const void *buf, size_t bytes) +{ + if (__builtin_constant_p(bytes) && iov_cnt && + offset <= iov[0].iov_len && bytes <= iov[0].iov_len - offset) { + memcpy(iov[0].iov_base + offset, buf, bytes); + return bytes; + } else { + return iov_from_buf_full(iov, iov_cnt, offset, buf, bytes); + } +} + +static inline size_t +iov_to_buf(const struct iovec *iov, const unsigned int iov_cnt, + size_t offset, void *buf, size_t bytes) +{ + if (__builtin_constant_p(bytes) && iov_cnt && + offset <= iov[0].iov_len && bytes <= iov[0].iov_len - offset) { + memcpy(buf, iov[0].iov_base + offset, bytes); + return bytes; + } else { + return iov_to_buf_full(iov, iov_cnt, offset, buf, bytes); + } +} /** * Set data bytes pointed out by iovec `iov' of size `iov_cnt' elements, diff --git a/util/iov.c b/util/iov.c index e802ee15bc..062f4e50c3 100644 --- a/util/iov.c +++ b/util/iov.c @@ -20,8 +20,8 @@ #include "qemu/iov.h" #include "qemu/sockets.h" -size_t iov_from_buf(const struct iovec *iov, unsigned int iov_cnt, - size_t offset, const void *buf, size_t bytes) +size_t iov_from_buf_full(const struct iovec *iov, unsigned int iov_cnt, + size_t offset, const void *buf, size_t bytes) { size_t done; unsigned int i; @@ -39,8 +39,8 @@ size_t iov_from_buf(const struct iovec *iov, unsigned int iov_cnt, return done; } -size_t iov_to_buf(const struct iovec *iov, const unsigned int iov_cnt, - size_t offset, void *buf, size_t bytes) +size_t iov_to_buf_full(const struct iovec *iov, const unsigned int iov_cnt, + size_t offset, void *buf, size_t bytes) { size_t done; unsigned int i; |