mirror of
https://sourceware.org/git/binutils-gdb.git
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fd67aa1129
Adds two new external authors to etc/update-copyright.py to cover bfd/ax_tls.m4, and adds gprofng to dirs handled automatically, then updates copyright messages as follows: 1) Update cgen/utils.scm emitted copyrights. 2) Run "etc/update-copyright.py --this-year" with an extra external author I haven't committed, 'Kalray SA.', to cover gas testsuite files (which should have their copyright message removed). 3) Build with --enable-maintainer-mode --enable-cgen-maint=yes. 4) Check out */po/*.pot which we don't update frequently.
307 lines
8.1 KiB
C
307 lines
8.1 KiB
C
/* Libiberty realpath. Like realpath, but more consistent behavior.
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Based on gdb_realpath from GDB.
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Copyright (C) 2003-2024 Free Software Foundation, Inc.
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This file is part of the libiberty library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor,
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Boston, MA 02110-1301, USA. */
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/*
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@deftypefn Replacement {const char*} lrealpath (const char *@var{name})
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Given a pointer to a string containing a pathname, returns a canonical
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version of the filename. Symlinks will be resolved, and ``.'' and ``..''
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components will be simplified. The returned value will be allocated using
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@code{malloc}, or @code{NULL} will be returned on a memory allocation error.
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@end deftypefn
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*/
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#include "config.h"
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#include "ansidecl.h"
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#include "libiberty.h"
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#ifdef HAVE_LIMITS_H
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#include <limits.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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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_STRING_H
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#include <string.h>
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#endif
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/* On GNU libc systems the declaration is only visible with _GNU_SOURCE. */
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#if defined(HAVE_CANONICALIZE_FILE_NAME) \
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&& defined(NEED_DECLARATION_CANONICALIZE_FILE_NAME)
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extern char *canonicalize_file_name (const char *);
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#endif
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#if defined(HAVE_REALPATH)
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# if defined (PATH_MAX)
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# define REALPATH_LIMIT PATH_MAX
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# else
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# if defined (MAXPATHLEN)
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# define REALPATH_LIMIT MAXPATHLEN
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# endif
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# endif
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#else
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/* cygwin has realpath, so it won't get here. */
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# if defined (_WIN32)
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# define WIN32_LEAN_AND_MEAN
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# include <windows.h> /* for GetFullPathName/GetFinalPathNameByHandle/
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CreateFile/CloseHandle */
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# define WIN32_REPLACE_SLASHES(_ptr, _len) \
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for (unsigned i = 0; i != (_len); ++i) \
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if ((_ptr)[i] == '\\') (_ptr)[i] = '/';
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# define WIN32_UNC_PREFIX "//?/UNC/"
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# define WIN32_UNC_PREFIX_LEN (sizeof(WIN32_UNC_PREFIX)-1)
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# define WIN32_IS_UNC_PREFIX(ptr) \
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(0 == memcmp(ptr, WIN32_UNC_PREFIX, WIN32_UNC_PREFIX_LEN))
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# define WIN32_NON_UNC_PREFIX "//?/"
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# define WIN32_NON_UNC_PREFIX_LEN (sizeof(WIN32_NON_UNC_PREFIX)-1)
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# define WIN32_IS_NON_UNC_PREFIX(ptr) \
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(0 == memcmp(ptr, WIN32_NON_UNC_PREFIX, WIN32_NON_UNC_PREFIX_LEN))
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/* Get full path name without symlinks resolution.
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It also converts all forward slashes to back slashes.
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*/
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char* get_full_path_name(const char *filename) {
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DWORD len;
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char *buf, *ptr, *res;
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/* determining the required buffer size.
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from the man: `If the lpBuffer buffer is too small to contain
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the path, the return value is the size, in TCHARs, of the buffer
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that is required to hold the path _and_the_terminating_null_character_`
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*/
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len = GetFullPathName(filename, 0, NULL, NULL);
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if ( len == 0 )
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return strdup(filename);
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buf = (char *)malloc(len);
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/* no point to check the result again */
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len = GetFullPathName(filename, len, buf, NULL);
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buf[len] = 0;
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/* replace slashes */
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WIN32_REPLACE_SLASHES(buf, len);
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/* calculate offset based on prefix type */
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len = WIN32_IS_UNC_PREFIX(buf)
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? (WIN32_UNC_PREFIX_LEN - 2)
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: WIN32_IS_NON_UNC_PREFIX(buf)
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? WIN32_NON_UNC_PREFIX_LEN
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: 0
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;
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ptr = buf + len;
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if ( WIN32_IS_UNC_PREFIX(buf) ) {
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ptr[0] = '/';
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ptr[1] = '/';
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}
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res = strdup(ptr);
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free(buf);
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return res;
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}
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# if _WIN32_WINNT >= 0x0600
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/* Get full path name WITH symlinks resolution.
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It also converts all forward slashes to back slashes.
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*/
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char* get_final_path_name(HANDLE fh) {
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DWORD len;
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char *buf, *ptr, *res;
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/* determining the required buffer size.
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from the man: `If the function fails because lpszFilePath is too
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small to hold the string plus the terminating null character,
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the return value is the required buffer size, in TCHARs. This
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value _includes_the_size_of_the_terminating_null_character_`.
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but in my testcase I have path with 26 chars, the function
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returns 26 also, ie without the trailing zero-char...
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*/
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len = GetFinalPathNameByHandle(
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fh
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,NULL
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,0
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,FILE_NAME_NORMALIZED | VOLUME_NAME_DOS
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);
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if ( len == 0 )
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return NULL;
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len += 1; /* for zero-char */
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buf = (char *)malloc(len);
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/* no point to check the result again */
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len = GetFinalPathNameByHandle(
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fh
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,buf
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,len
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,FILE_NAME_NORMALIZED | VOLUME_NAME_DOS
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);
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buf[len] = 0;
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/* replace slashes */
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WIN32_REPLACE_SLASHES(buf, len);
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/* calculate offset based on prefix type */
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len = WIN32_IS_UNC_PREFIX(buf)
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? (WIN32_UNC_PREFIX_LEN - 2)
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: WIN32_IS_NON_UNC_PREFIX(buf)
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? WIN32_NON_UNC_PREFIX_LEN
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: 0
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;
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ptr = buf + len;
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if ( WIN32_IS_UNC_PREFIX(buf) ) {
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ptr[0] = '/';
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ptr[1] = '/';
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}
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res = strdup(ptr);
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free(buf);
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return res;
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}
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# endif // _WIN32_WINNT >= 0x0600
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# endif // _WIN32
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#endif
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char *
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lrealpath (const char *filename)
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{
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/* Method 1: The system has a compile time upper bound on a filename
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path. Use that and realpath() to canonicalize the name. This is
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the most common case. Note that, if there isn't a compile time
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upper bound, you want to avoid realpath() at all costs. */
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#if defined(REALPATH_LIMIT)
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{
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char buf[REALPATH_LIMIT];
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const char *rp = realpath (filename, buf);
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if (rp == NULL)
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rp = filename;
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return strdup (rp);
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}
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#endif /* REALPATH_LIMIT */
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/* Method 2: The host system (i.e., GNU) has the function
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canonicalize_file_name() which malloc's a chunk of memory and
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returns that, use that. */
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#if defined(HAVE_CANONICALIZE_FILE_NAME)
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{
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char *rp = canonicalize_file_name (filename);
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if (rp == NULL)
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return strdup (filename);
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else
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return rp;
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}
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#endif
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/* Method 3: Now we're getting desperate! The system doesn't have a
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compile time buffer size and no alternative function. Query the
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OS, using pathconf(), for the buffer limit. Care is needed
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though, some systems do not limit PATH_MAX (return -1 for
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pathconf()) making it impossible to pass a correctly sized buffer
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to realpath() (it could always overflow). On those systems, we
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skip this. */
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#if defined (HAVE_REALPATH) && defined (HAVE_UNISTD_H)
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{
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/* Find out the max path size. */
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long path_max = pathconf ("/", _PC_PATH_MAX);
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if (path_max > 0)
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{
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/* PATH_MAX is bounded. */
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char *buf, *rp, *ret;
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buf = (char *) malloc (path_max);
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if (buf == NULL)
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return NULL;
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rp = realpath (filename, buf);
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ret = strdup (rp ? rp : filename);
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free (buf);
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return ret;
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}
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}
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#endif
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/* The MS Windows method */
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#if defined (_WIN32)
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{
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char *res;
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/* For Windows Vista and greater */
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#if _WIN32_WINNT >= 0x0600
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/* For some reason the function receives just empty `filename`, but not NULL.
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What should we do in that case?
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According to `strdup()` implementation
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(https://elixir.bootlin.com/glibc/latest/source/string/strdup.c)
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it will alloc 1 byte even for empty but non NULL string.
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OK, will use `strdup()` for that case.
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*/
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if ( 0 == strlen(filename) )
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return strdup(filename);
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HANDLE fh = CreateFile(
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filename
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,FILE_READ_ATTRIBUTES
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,FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE
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,NULL
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,OPEN_EXISTING
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,FILE_FLAG_BACKUP_SEMANTICS
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,NULL
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);
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if ( fh == INVALID_HANDLE_VALUE ) {
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res = get_full_path_name(filename);
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} else {
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res = get_final_path_name(fh);
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CloseHandle(fh);
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if ( !res )
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res = get_full_path_name(filename);
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}
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#else
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/* For Windows XP */
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res = get_full_path_name(filename);
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#endif // _WIN32_WINNT >= 0x0600
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return res;
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}
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#endif // _WIN32
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}
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