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= nng_msg_header_trim(3)
//
// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
// Copyright 2018 Capitar IT Group BV <info@capitar.com>
//
// This document is supplied under the terms of the MIT License, a
// copy of which should be located in the distribution where this
// file was obtained (LICENSE.txt). A copy of the license may also be
// found online at https://opensource.org/licenses/MIT.
//
== NAME
nng_msg_header_trim, nng_msg_header_trim_u32 - remove data from start of message header
== SYNOPSIS
[source, c]
-----------
#include <nng/nng.h>
int nng_msg_header_trim(nng_msg *msg, size_t size);
int nng_msg_header_trim_u32(nng_msg *msg, uint32_t *val32);
-----------
== DESCRIPTION
The `nng_msg_header_trim()` and `nng_msg_header_trim_u32()` functions remove
data from the start of the header of message _msg_.
The first function removes _size_ bytes.
The second function removes 4 bytes, and stores them in the value _val32_,
after converting them from network-byte order (big-endian) to native
byte order.
== RETURN VALUES
This function returns 0 on success, and non-zero otherwise.
== ERRORS
`NNG_EINVAL`:: The message header is too short to remove the requested data.
== SEE ALSO
<<nng_msg_alloc#,nng_msg_alloc(3)>>,
<<nng_msg_header#,nng_msg_header(3)>>,
<<nng_msg_header_append#,nng_msg_header_append(3)>>,
<<nng_msg_header_chop#,nng_msg_header_chop(3)>>,
<<nng_msg_header_insert#,nng_msg_header_insert(3)>>,
<<nng_msg_header_len#,nng_msg_header_len(3)>>,
<<nng_msg_free#,nng_msg_free(3)>>,
<<nng_strerror#,nng_strerror(3)>>,
<<nng#,nng(7)>>
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