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