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| author | Volker Lendecke <vl@samba.org> | 2014-12-27 13:16:20 +0000 |
|---|---|---|
| committer | Jeremy Allison <jra@samba.org> | 2014-12-30 00:25:08 +0100 |
| commit | 8855c0332a5ad2996873727074af6974f1238d5f (patch) | |
| tree | 976c31cba5a48a051bd773d6ab79ba60772e6f4a /source3/lib | |
| parent | b4ceef0230a13a66e91f33d831a5e77babaef0ed (diff) | |
| download | samba-8855c0332a5ad2996873727074af6974f1238d5f.tar.gz samba-8855c0332a5ad2996873727074af6974f1238d5f.tar.xz samba-8855c0332a5ad2996873727074af6974f1238d5f.zip | |
lib: Add iov_advance
This chops off n bytes from an iovec array. Used for short writev's
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Diffstat (limited to 'source3/lib')
| -rw-r--r-- | source3/lib/iov_buf.c | 33 | ||||
| -rw-r--r-- | source3/lib/iov_buf.h | 2 |
2 files changed, 35 insertions, 0 deletions
diff --git a/source3/lib/iov_buf.c b/source3/lib/iov_buf.c index e05dfc9524..f0e05a64da 100644 --- a/source3/lib/iov_buf.c +++ b/source3/lib/iov_buf.c @@ -53,3 +53,36 @@ ssize_t iov_buf(const struct iovec *iov, int iovcnt, return needed; } + +bool iov_advance(struct iovec **iov, int *iovcnt, size_t n) +{ + struct iovec *v = *iov; + int cnt = *iovcnt; + + while (n > 0) { + if (cnt == 0) { + return false; + } + if (n < v->iov_len) { + v->iov_base = (char *)v->iov_base + n; + v->iov_len -= n; + break; + } + n -= v->iov_len; + v += 1; + cnt -= 1; + } + + /* + * Skip 0-length iovec's + */ + + while ((cnt > 0) && (v->iov_len == 0)) { + v += 1; + cnt -= 1; + } + + *iov = v; + *iovcnt = cnt; + return true; +} diff --git a/source3/lib/iov_buf.h b/source3/lib/iov_buf.h index 397e906eb4..8f0ca266da 100644 --- a/source3/lib/iov_buf.h +++ b/source3/lib/iov_buf.h @@ -22,9 +22,11 @@ #include <unistd.h> #include <stdint.h> +#include <stdbool.h> ssize_t iov_buflen(const struct iovec *iov, int iovlen); ssize_t iov_buf(const struct iovec *iov, int iovcnt, uint8_t *buf, size_t buflen); +bool iov_advance(struct iovec **iov, int *iovcnt, size_t n); #endif |