freebsd-dev/lib/libpathconv/rel2abs.3

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.\"
.\" Copyright (c) 1997 Shigio Yamaguchi. All rights reserved.
.\" Copyright (c) 1999 Tama Communications Corporation. All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
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.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" documentation and/or other materials provided with the distribution.
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" $FreeBSD$
.\"
.Dd Dec 3, 1997"
.Dt REL2ABS 3
.Os
.Sh NAME
.Nm rel2abs
.Nd make an absolute path name from a relative path name
.Sh SYNOPSIS
.Ft "char *"
.Fn rel2abs "const char *path" "const char *base" "char *result" "size_t size"
.Sh DESCRIPTION
The
.Fn rel2abs
function makes an absolute path name from a relative path name
.Fa path
based on a directory
.Fa base
and copies the resulting path name into the memory referenced by
.Fa result .
The
.Fa result
argument must refer to a buffer capable of storing at least
.Fa size
character
The resulting path name may include symbolic links.
.Fn abs2rel
doesn't check whether or not any path exists.
.Sh "RETURN VALUES"
The
.Fn rel2abs
function returns absolute path name on success.
If an error occurs, it returns
.Dv NULL .
.Sh ERRORS
The
.Fn rel2abs
function may fail and set the external variable
.Va errno
to indicate the error.
.Bl -tag -width Er
.It Bq Er EINVAL
The
.Fa base
directory isn't an absolute path name or the
.Fa size
argument is zero.
.It Bq Er ERANGE
The
.Fa size
argument is greater than zero but smaller than the length of the pathname plus 1
.Sh EXAMPLE
char result[MAXPATHLEN];
char *path = rel2abs("../../src/sys", "/usr/local/lib", result, MAXPATHLEN);
yields:
path == "/usr/src/sys"
Similarly,
path1 = rel2abs("src/sys", "/usr", result, MAXPATHLEN);
path2 = rel2abs(".", "/usr/src/sys", result, MAXPATHLEN);
yields:
path1 == "/usr/src/sys"
path2 == "/usr/src/sys"
.Sh "SEE ALSO"
.Xr abs2rel 3
.Sh AUTHORS
Shigio Yamaguchi (shigio@tamacom.com)