.\"-
.\" Copyright (c) 2015 Universitetet i Oslo
.\" Copyright (c) 2016 Dag-Erling Smørgrav
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.Dd Septmber 17, 2016
.Dt cryb_strlcat 3
.Os
.Sh NAME
.Nm cryb_strlcat
.Nd safely append a string to a buffer
.Sh LIBRARY
.Lb libcryb
.Sh SYNOPSIS
.In stddef.h
.In cryb/strlcat.h
.Ft size_t
.Fn cryb_strlcat "char *dst" "const char *src" "size_t size"
.Sh DESCRIPTION
The
.Nm cryb_strlcat
function appends the NUL-terminated string pointed to by
.Va src
to the NUL-terminated string stored in the buffer pointed to by
.Va dst .
The
.Va size
argument specifies the total size of the buffer including the space
occupied by the existing string and space for the terminating NUL
character.
If the sum of the lengths of both strings exceeds the available space,
the result is truncated.
In all cases, the destination buffer is properly NUL-terminated.
.Sh RETURN VALUES
The
.Fn cryb_strlcat
function returns the sum of the lengths of the original strings.
If this number is equal to or greater than the value of the
.Va size
argument, the string was too long to fit in the buffer.
.Sh IMPLEMENTATION NOTES
If the
.Dv HAVE_STRLCAT
preprocessor macro is defined to 0 or undefined, the
.In cryb/strlcat.h
header provides a
.Fn strlcat
macro as an alias to
.Fn cryb_strlcat .
.Sh SEE ALSO
.Xr cryb_strlcpy 3
.Sh AUTHORS
The
.Fn cryb_strlcat
function and this manual page were written for the University of Oslo
by
.An Dag-Erling Sm\(/orgrav Aq Mt d.e.smorgrav@usit.uio.no .