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23ce05f906
SPDX is an international standard for documenting software license requirements. Remove the existing headers and replace with a brief SPDX preamble. See: https://spdx.dev/use/specifications/ The script used to convert the files is added to "tools", and the file header templates in headers/ are updated. Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
104 lines
2.2 KiB
C
104 lines
2.2 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/* Copyright 2016 The NASM Authors - All Rights Reserved */
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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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