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.\" Copyright (c) 2011,2012 Joseph Koshy. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" This software is provided by Joseph Koshy ``as is'' and
.\" any express or implied warranties, including, but not limited to, the
.\" implied warranties of merchantability and fitness for a particular purpose
.\" are disclaimed. in no event shall Joseph Koshy be liable
.\" for any direct, indirect, incidental, special, exemplary, or consequential
.\" damages (including, but not limited to, procurement of substitute goods
.\" or services; loss of use, data, or profits; or business interruption)
.\" however caused and on any theory of liability, whether in contract, strict
.\" liability, or tort (including negligence or otherwise) arising in any way
.\" out of the use of this software, even if advised of the possibility of
.\" such damage.
.\"
.\" $Id: elftc_version.3 2828 2012-12-30 04:41:27Z jkoshy $
.\"
.Dd December 30, 2012
.Os
.Dt ELFTC_VERSION 3
.Sh NAME
.Nm elftc_version
.Nd return a project-wide version identifier string
.Sh LIBRARY
.Lb libelftc
.Sh SYNOPSIS
.In libelftc.h
.Ft const char *
.Fn elftc_version void
.Sh DESCRIPTION
Function
.Fn elftc_version
returns a project-wide identifier string that encodes the source
revision of the project source tree.
.Pp
The returned identifier has four space-separated fields:
.Bl -tag -width ".Em Project Branch"
.It Em "Project-Name"
This is always
.Dq elftoolchain .
.It Em "Project-Branch"
The branch name for the project source tree.
.It Em "Build-OS"
The operating system that the tool chain was compiled for.
.It Em "Version-Number"
A tree-wide version number extracted from the version control
system in use.
.El
.Sh RETURN VALUE
Function
.Fn elftc_program_version
returns a pointer to an internal character buffer.
.Sh EXAMPLES
To retrieve and print the current toolchain version identifier, use:
.Bd -literal -offset indent
#include <sys/types.h>
#include <libelftc.h>
(void) printf("%s\en", elftc_version());
.Ed
.Pp
On the HEAD branch of the project's sources, when checked out using
Subversion and compiled on a NetBSD host, this would print:
.D1 Dq elftoolchain HEAD NetBSD svn: Ns Em REVINFO
where
.Em REVINFO
would be the current revision information for the project source tree.
.Sh ERRORS
Function
.Fn elftc_program_version
always succeeds.
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