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/* SPDX-License-Identifier: BSD-2-Clause */
/* Copyright 2016 The NASM Authors - All Rights Reserved */
/*
* realpath.c As system-independent as possible implementation of realpath()
*/
#include "compiler.h"
#include <errno.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
#include "nasmlib.h"
#ifdef HAVE_CANONICALIZE_FILE_NAME
/*
* GNU-specific, but avoids the realpath(..., NULL)
* portability problem if it exists.
*/
char *nasm_realpath(const char *rel_path)
{
char *rp = canonicalize_file_name(rel_path);
return rp ? rp : nasm_strdup(rel_path);
}
#elif defined(HAVE_REALPATH)
/*
* POSIX.1-2008 defines realpath(..., NULL); POSIX.1-2001 doesn't guarantee
* that a NULL second argument is supported.
*/
char *nasm_realpath(const char *rel_path)
{
char *rp;
rp = realpath(rel_path, NULL);
/* Not all implementations of realpath() support a NULL second argument */
if (!rp && errno == EINVAL) {
long path_max = -1;
char *rp;
#if defined(HAVE_PATHCONF) && defined(_PC_PATH_MAX)
path_max = pathconf(rel_path, _PC_PATH_MAX); /* POSIX */
#endif
if (path_max < 0) {
#ifdef PATH_MAX
path_max = PATH_MAX; /* SUSv2 */
#elif defined(MAXPATHLEN)
path_max = MAXPATHLEN; /* Solaris */
#else
path_max = 65536; /* Crazily high, we hope */
#endif
}
rp = nasm_malloc(path_max);
if (!realpath(rel_path, rp)) {
nasm_free(rp);
rp = NULL;
} else {
/* On some systems, pathconf() can return a very large value */
rp[path_max - 1] = '\0'; /* Just in case overrun is possible */
rp = nasm_realloc(rp, strlen(rp) + 1);
}
}
return rp ? rp : nasm_strdup(rel_path);
}
#elif defined(HAVE__FULLPATH)
/*
* win32/win64 API
*/
char *nasm_realpath(const char *rel_path)
{
char *rp = _fullpath(NULL, rel_path, 0);
return rp ? rp : nasm_strdup(rel_path);
}
#else
/*
* There is nothing we know how to do here, so hope it just works anyway.
*/
char *nasm_realpath(const char *rel_path)
{
return nasm_strdup(rel_path);
}
#endif
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