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.\"   Copyright (c) 1994-2006 Lars Wirzenius.  All rights reserved.
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.\" part of publib
.\" "@(#)publib-strutil:$Id: memins.3,v 1.2 1994/06/20 20:29:53 liw Exp $"
.\"
.TH MEMINS 3pub "C Programmer's Manual" Publib "C Programmer's Manual"
.SH NAME
memins \- insert bytes at beginning of memory block
.SH SYNOPSIS
.nf
#include <publib.h>
void *\fBmemins\fR(void *\fItgt\fR, size_t \fItgtsize\fR, const void *\fIsrc\fR, size_t \fIsrcsize\fR);
.SH DESCRIPTION
\fImemins\fR inserts \fIsrcsize\fR bytes from \fIsrc\fR at the beginning
of \fItgt\fR, but moves the first \fItgtsize\fR out of the way.  The source
and target memory blocks must not overlap.
.SH "RETURN VALUE"
\fImemins\fR returns its first argument.
.SH EXAMPLE
To insert a new element at the \fIi\fRth position of an array,
one might do the following.
.sp 1
.nf
.in +5
int new, array[10];

memins(array+i, (10-i-1)*sizeof(array[0]), &new, sizeof(new));
.in -5
.sp 1
.fi
Please note that the above code carefully avoids the trap of moving the
last element of the array past the end of the array.
.SH "SEE ALSO"
publib(3), strins(3)
.SH AUTHOR
Lars Wirzenius (lars.wirzenius@helsinki.fi)