mirror of
https://gitlab.com/sortix/sortix.git
synced 2023-02-13 20:55:38 -05:00
57 lines
1.9 KiB
C++
57 lines
1.9 KiB
C++
/*******************************************************************************
|
|
|
|
Copyright(C) Jonas 'Sortie' Termansen 2013.
|
|
|
|
This file is part of the Sortix C Library.
|
|
|
|
The Sortix C Library is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or (at your
|
|
option) any later version.
|
|
|
|
The Sortix C Library is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
|
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
realpath.cpp
|
|
Return the canonicalized filename.
|
|
|
|
*******************************************************************************/
|
|
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <limits.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
char* realpath(const char* restrict path, char* restrict resolved_path)
|
|
{
|
|
char* ret_path = canonicalize_file_name(path);
|
|
if ( !ret_path )
|
|
return NULL;
|
|
if ( !resolved_path )
|
|
return ret_path;
|
|
#ifdef PATH_MAX
|
|
if ( PATH_MAX < strlen(ret_path) + 1 )
|
|
return errno = ENAMETOOLONG, (char*) NULL;
|
|
strcpy(resolved_path, ret_path);
|
|
free(ret_path);
|
|
return resolved_path;
|
|
#else
|
|
if ( !isatty(2) )
|
|
dup2(open("/dev/tty", O_WRONLY), 2);
|
|
fprintf(stderr, "%s:%u: %s(\"%s\", %p) = \"%s\": "
|
|
"This platform doesn't have PATH_MAX and the second argument "
|
|
"wasn't NULL - You cannot reliably allocate a sufficiently large "
|
|
"buffer and the POSIX standard specifies this as undefined "
|
|
"behavior, aborting.\n", __FILE__, __LINE__, __func__, path,
|
|
resolved_path, ret_path);
|
|
abort();
|
|
#endif
|
|
}
|