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https://github.com/netwide-assembler/nasm.git
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134 lines
3.7 KiB
C
134 lines
3.7 KiB
C
/* ----------------------------------------------------------------------- *
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*
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* Copyright 2016 The NASM Authors - All Rights Reserved
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* See the file AUTHORS included with the NASM distribution for
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* the specific copyright holders.
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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
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* conditions are met:
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*
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* * 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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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* ----------------------------------------------------------------------- */
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/*
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* realpath.c As system-independent as possible implementation of realpath()
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*/
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#include "compiler.h"
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#include <errno.h>
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#ifdef HAVE_SYS_PARAM_H
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# include <sys/param.h>
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#endif
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#include "nasmlib.h"
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#ifdef HAVE_CANONICALIZE_FILE_NAME
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/*
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* GNU-specific, but avoids the realpath(..., NULL)
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* portability problem if it exists.
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*/
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char *nasm_realpath(const char *rel_path)
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{
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char *rp = canonicalize_file_name(rel_path);
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return rp ? rp : nasm_strdup(rel_path);
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}
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#elif defined(HAVE_REALPATH)
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/*
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* POSIX.1-2008 defines realpath(..., NULL); POSIX.1-2001 doesn't guarantee
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* that a NULL second argument is supported.
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*/
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char *nasm_realpath(const char *rel_path)
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{
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char *rp;
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rp = realpath(rel_path, NULL);
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/* Not all implementations of realpath() support a NULL second argument */
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if (!rp && errno == EINVAL) {
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long path_max = -1;
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char *rp;
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#if defined(HAVE_PATHCONF) && defined(_PC_PATH_MAX)
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path_max = pathconf(rel_path, _PC_PATH_MAX); /* POSIX */
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#endif
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if (path_max < 0) {
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#ifdef PATH_MAX
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path_max = PATH_MAX; /* SUSv2 */
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#elif defined(MAXPATHLEN)
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path_max = MAXPATHLEN; /* Solaris */
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#else
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path_max = 65536; /* Crazily high, we hope */
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#endif
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}
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rp = nasm_malloc(path_max);
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if (!realpath(rel_path, rp)) {
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nasm_free(rp);
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rp = NULL;
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} else {
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/* On some systems, pathconf() can return a very large value */
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rp[path_max - 1] = '\0'; /* Just in case overrun is possible */
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rp = nasm_realloc(rp, strlen(rp) + 1);
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}
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}
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return rp ? rp : nasm_strdup(rel_path);
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}
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#elif defined(HAVE__FULLPATH)
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/*
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* win32/win64 API
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*/
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char *nasm_realpath(const char *rel_path)
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{
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char *rp = _fullpath(NULL, rel_path, 0);
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return rp ? rp : nasm_strdup(rel_path);
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}
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#else
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/*
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* There is nothing we know how to do here, so hope it just works anyway.
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*/
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char *nasm_realpath(const char *rel_path)
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{
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return nasm_strdup(rel_path);
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}
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#endif
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