129 lines
3.8 KiB
Groff
129 lines
3.8 KiB
Groff
.\" Copyright (c) 1998 John D. Polstra
|
|
.\" 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 THE AUTHOR AND CONTRIBUTORS ``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 THE AUTHOR OR CONTRIBUTORS 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.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd September 7, 1998
|
|
.Dt GETOBJFORMAT 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm getobjformat
|
|
.Nd get preferred object file format
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In objformat.h
|
|
.Ft int
|
|
.Fn getobjformat "char *buf" "size_t bufsize" "int *argcp" "char **argv"
|
|
.Sh DESCRIPTION
|
|
.Fn getobjformat
|
|
queries several sources to determine the preferred object file
|
|
format, and copies its name into a buffer provided by the caller.
|
|
.Pp
|
|
The object file format is determined as follows. If
|
|
.Va argv
|
|
is
|
|
.No non- Ns Ev NULL
|
|
and an explicit command line argument such as
|
|
.Fl aout
|
|
or
|
|
.Fl elf
|
|
is present, then that determines the object file format.
|
|
.Pp
|
|
Otherwise, if the variable
|
|
.Ev OBJFORMAT
|
|
is set in the environment, the object file format is taken from its
|
|
value.
|
|
.Pp
|
|
Otherwise, if the file
|
|
.Pa /etc/objformat
|
|
is readable and contains a line of the form
|
|
.Ql OBJFORMAT=xxx ,
|
|
the object file format is taken from there.
|
|
.Pp
|
|
Otherwise, a built-in system default object file format is returned.
|
|
.Pp
|
|
.Va buf
|
|
points to a user-supplied buffer into which the name of the object
|
|
file format is copied.
|
|
.Va bufsize
|
|
gives the size of the buffer in bytes. The string placed in
|
|
.Va buf
|
|
is always null-terminated. It is an error if the buffer is too
|
|
small to hold the null-terminated name.
|
|
.Pp
|
|
.Va argv
|
|
points to a
|
|
.Dv NULL Ns -terminated
|
|
argument vector to be scanned for object
|
|
format options.
|
|
.Va argv
|
|
may be
|
|
.Dv NULL ,
|
|
in which case the argument vector is not scanned.
|
|
.Pp
|
|
If
|
|
.Va argcp
|
|
is non-NULL, any object format options are deleted from the
|
|
argument vector, and the updated argument count is stored into
|
|
the integer referenced by
|
|
.Va argcp .
|
|
If
|
|
.Va argcp
|
|
is
|
|
.Dv NULL ,
|
|
the argument vector is left unchanged.
|
|
.Sh RETURN VALUES
|
|
On success,
|
|
.Fn getobjformat
|
|
returns the length of the object file format name, not counting the
|
|
null terminator.
|
|
If the supplied buffer is too small to hold the object file format
|
|
and its null terminator,
|
|
.Fn getobjformat
|
|
returns -1. In that case, the contents of the buffer and argument
|
|
vector supplied by the caller are indeterminate.
|
|
.Sh ENVIRONMENT
|
|
.Bl -tag -width OBJFORMAT
|
|
.It Ev OBJFORMAT
|
|
If the environment variable
|
|
.Ev OBJFORMAT
|
|
is set, it overrides the default object file format.
|
|
.Ev OBJFORMAT takes precedence over
|
|
.Pa /etc/objformat .
|
|
.El
|
|
.Sh FILES
|
|
.Bl -tag -width /etc/objformat -compact
|
|
.It Pa /etc/objformat
|
|
If present, specifies the object file format to use. Syntax is
|
|
.Ql OBJFORMAT=xxx .
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr objformat 1
|
|
.Sh HISTORY
|
|
The
|
|
.Fn getobjformat
|
|
function first appeared in
|
|
.Fx 3.0 .
|