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97 lines
2.9 KiB
Groff
97 lines
2.9 KiB
Groff
.\"
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.\" Copyright (c) 1997 Shigio Yamaguchi. All rights reserved.
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.\" Copyright (c) 1999 Tama Communications Corporation. 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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.Dd August 7, 2022
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.Dt REL2ABS 3
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.Os
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.Sh NAME
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.Nm rel2abs
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.Nd make an absolute path name from a relative path name
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.Sh SYNOPSIS
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.Ft "char *"
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.Fn rel2abs "const char *path" "const char *base" "char *result" "size_t size"
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.Sh DESCRIPTION
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The
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.Fn rel2abs
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function makes an absolute path name from a relative path name
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.Fa path
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based on a directory
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.Fa base
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and copies the resulting path name into the memory referenced by
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.Fa result .
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The
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.Fa result
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argument must refer to a buffer capable of storing at least
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.Fa size
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character
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The resulting path name may include symbolic links.
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.Fn abs2rel
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doesn't check whether or not any path exists.
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.Sh "RETURN VALUES"
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The
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.Fn rel2abs
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function returns absolute path name on success.
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If an error occurs, it returns
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.Dv NULL .
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.Sh EXAMPLES
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char result[MAXPATHLEN];
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char *path = rel2abs("../../src/sys", "/usr/local/lib", result, MAXPATHLEN);
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yields:
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path == "/usr/src/sys"
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Similarly,
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path1 = rel2abs("src/sys", "/usr", result, MAXPATHLEN);
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path2 = rel2abs(".", "/usr/src/sys", result, MAXPATHLEN);
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yields:
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path1 == "/usr/src/sys"
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path2 == "/usr/src/sys"
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.Sh ERRORS
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The
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.Fn rel2abs
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function may fail and set the external variable
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.Va errno
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to indicate the error.
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.Bl -tag -width Er
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.It Bq Er EINVAL
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The
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.Fa base
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directory isn't an absolute path name or the
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.Fa size
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argument is zero.
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.It Bq Er ERANGE
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The
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.Fa size
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argument is greater than zero but smaller than the length of the pathname plus 1
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.Sh SEE ALSO
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.Xr abs2rel 3
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.Sh AUTHORS
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.An Shigio Yamaguchi (shigio@tamacom.com)
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