136 lines
3.8 KiB
Groff
136 lines
3.8 KiB
Groff
.\" Copyright (c) 1998 John D. Polstra
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd September 7, 1998
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.Dt GETOBJFORMAT 3
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.Os
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.Sh NAME
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.Nm getobjformat
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.Nd get preferred object file format
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In objformat.h
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.Ft int
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.Fn getobjformat "char *buf" "size_t bufsize" "int *argcp" "char **argv"
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.Sh DESCRIPTION
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The
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.Fn getobjformat
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function
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queries several sources to determine the preferred object file
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format, and copies its name into a buffer provided by the caller.
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.Pp
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The object file format is determined as follows.
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If
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.Va argv
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is
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.No non- Ns Ev NULL
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and an explicit command line argument such as
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.Fl aout
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or
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.Fl elf
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is present, then that determines the object file format.
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.Pp
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Otherwise, if the variable
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.Ev OBJFORMAT
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is set in the environment, the object file format is taken from its
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value.
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.Pp
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Otherwise, if the file
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.Pa /etc/objformat
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is readable and contains a line of the form
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.Ql OBJFORMAT=xxx ,
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the object file format is taken from there.
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.Pp
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Otherwise, a built-in system default object file format is returned.
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.Pp
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.Va buf
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points to a user-supplied buffer into which the name of the object
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file format is copied.
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.Va bufsize
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gives the size of the buffer in bytes.
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The string placed in
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.Va buf
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is always null-terminated.
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It is an error if the buffer is too
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small to hold the null-terminated name.
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.Pp
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.Va argv
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points to a
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.Dv NULL Ns -terminated
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argument vector to be scanned for object
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format options.
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.Va argv
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may be
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.Dv NULL ,
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in which case the argument vector is not scanned.
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.Pp
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If
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.Va argcp
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is non-NULL, any object format options are deleted from the
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argument vector, and the updated argument count is stored into
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the integer referenced by
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.Va argcp .
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If
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.Va argcp
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is
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.Dv NULL ,
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the argument vector is left unchanged.
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.Sh RETURN VALUES
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On success,
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.Fn getobjformat
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returns the length of the object file format name, not counting the
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null terminator.
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If the supplied buffer is too small to hold the object file format
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and its null terminator,
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.Fn getobjformat
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returns -1.
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In that case, the contents of the buffer and argument
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vector supplied by the caller are indeterminate.
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.Sh ENVIRONMENT
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.Bl -tag -width OBJFORMAT
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.It Ev OBJFORMAT
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If the environment variable
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.Ev OBJFORMAT
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is set, it overrides the default object file format.
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.Ev OBJFORMAT takes precedence over
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.Pa /etc/objformat .
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.El
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.Sh FILES
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.Bl -tag -width /etc/objformat -compact
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.It Pa /etc/objformat
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If present, specifies the object file format to use.
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Syntax is
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.Ql OBJFORMAT=xxx .
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.El
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.Sh SEE ALSO
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.Xr objformat 1
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.Sh HISTORY
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The
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.Fn getobjformat
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function first appeared in
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.Fx 3.0 .
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