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.Dd August 7, 2022 27.Dt REL2ABS 3 28.Os 29.Sh NAME 30.Nm rel2abs 31.Nd make an absolute path name from a relative path name 32.Sh SYNOPSIS 33.Ft "char *" 34.Fn rel2abs "const char *path" "const char *base" "char *result" "size_t size" 35.Sh DESCRIPTION 36The 37.Fn rel2abs 38function makes an absolute path name from a relative path name 39.Fa path 40based on a directory 41.Fa base 42and copies the resulting path name into the memory referenced by 43.Fa result . 44The 45.Fa result 46argument must refer to a buffer capable of storing at least 47.Fa size 48character 49 50The resulting path name may include symbolic links. 51.Fn abs2rel 52doesn't check whether or not any path exists. 53.Sh "RETURN VALUES" 54The 55.Fn rel2abs 56function returns absolute path name on success. 57If an error occurs, it returns 58.Dv NULL . 59.Sh EXAMPLES 60 char result[MAXPATHLEN]; 61 char *path = rel2abs("../../src/sys", "/usr/local/lib", result, MAXPATHLEN); 62 63yields: 64 65 path == "/usr/src/sys" 66 67Similarly, 68 69 path1 = rel2abs("src/sys", "/usr", result, MAXPATHLEN); 70 path2 = rel2abs(".", "/usr/src/sys", result, MAXPATHLEN); 71 72yields: 73 74 path1 == "/usr/src/sys" 75 path2 == "/usr/src/sys" 76.Sh ERRORS 77The 78.Fn rel2abs 79function may fail and set the external variable 80.Va errno 81to indicate the error. 82.Bl -tag -width Er 83.It Bq Er EINVAL 84The 85.Fa base 86directory isn't an absolute path name or the 87.Fa size 88argument is zero. 89.It Bq Er ERANGE 90The 91.Fa size 92argument is greater than zero but smaller than the length of the pathname plus 1 93.El 94.Sh SEE ALSO 95.Xr abs2rel 3 96.Sh AUTHORS 97.An Shigio Yamaguchi (shigio@tamacom.com) 98