1.\" 2.\" Copyright (c) 1997 Shigio Yamaguchi. All rights reserved. 3.\" Copyright (c) 1999 Tama Communications Corporation. All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 14.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24.\" SUCH DAMAGE. 25.\" 26.\" $FreeBSD$ 27.\" 28.Dd Dec 3, 1997" 29.Dt REL2ABS 3 30.Os 31.Sh NAME 32.Nm rel2abs 33.Nd make an absolute path name from a relative path name 34.Sh SYNOPSIS 35.Ft "char *" 36.Fn rel2abs "const char *path" "const char *base" "char *result" "size_t size" 37.Sh DESCRIPTION 38The 39.Fn rel2abs 40function makes an absolute path name from a relative path name 41.Fa path 42based on a directory 43.Fa base 44and copies the resulting path name into the memory referenced by 45.Fa result . 46The 47.Fa result 48argument must refer to a buffer capable of storing at least 49.Fa size 50character 51 52The resulting path name may include symbolic links. 53.Fn abs2rel 54doesn't check whether or not any path exists. 55.Sh "RETURN VALUES" 56The 57.Fn rel2abs 58function returns absolute path name on success. 59If an error occurs, it returns 60.Dv NULL . 61.Sh ERRORS 62The 63.Fn rel2abs 64function may fail and set the external variable 65.Va errno 66to indicate the error. 67.Bl -tag -width Er 68.It Bq Er EINVAL 69The 70.Fa base 71directory isn't an absolute path name or the 72.Fa size 73argument is zero. 74.It Bq Er ERANGE 75The 76.Fa size 77argument is greater than zero but smaller than the length of the pathname plus 1 78.Sh EXAMPLE 79 char result[MAXPATHLEN]; 80 char *path = rel2abs("../../src/sys", "/usr/local/lib", result, MAXPATHLEN); 81 82yields: 83 84 path == "/usr/src/sys" 85 86Similarly, 87 88 path1 = rel2abs("src/sys", "/usr", result, MAXPATHLEN); 89 path2 = rel2abs(".", "/usr/src/sys", result, MAXPATHLEN); 90 91yields: 92 93 path1 == "/usr/src/sys" 94 path2 == "/usr/src/sys" 95.Sh "SEE ALSO" 96.Xr abs2rel 3 97.Sh AUTHORS 98Shigio Yamaguchi (shigio@tamacom.com) 99