vasilito
068a1ca63e
Bootloader fork rebase:
- Base changed from 0.1.0 pre-patched archive to upstream 1.0.0 tag (c7eeb9f)
- Applied 0001-redbear-local-forks.patch (Cargo.toml crate path redirects)
- Applied fix-uefi-alloc-panic.patch equivalents (4 panic!() -> graceful
error handling in src/main.rs)
- Applied P5-live-preload-cap-1gib.patch (1 GiB cap on live image preload)
- Skipped: P0 GPT partition scan (requires new module + integration),
P1 timeout/default-resolution, P2 live preload guard (subsumed by
panic fixes + cap), P3 live image safe read, P4 large ISO boot,
redox.patch — to be applied in dedicated rebase session.
firmware-loader/Cargo.toml: version 0.1.0 -> 0.3.0 (sync with other
Red Bear custom crates which are at 0.3.0).
fork-upstream-map.toml: bootloader back from PENDING_REBASE to 1.0.0
since the partial rebase matches upstream 1.0.0 content.
fork-upstream-map.toml: base restored to 'main' tracked (was correctly
tracked by build-redbear.sh).
115 lines
3.4 KiB
C
115 lines
3.4 KiB
C
/* Read the contents of a symbolic link.
|
|
Copyright (C) 2003-2007, 2009-2025 Free Software Foundation, Inc.
|
|
|
|
This file is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as
|
|
published by the Free Software Foundation; either version 2.1 of the
|
|
License, or (at your option) any later version.
|
|
|
|
This file is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with this program. If not, see <https://www.gnu.org/licenses/>. */
|
|
|
|
#include <config.h>
|
|
|
|
/* Specification. */
|
|
#include <unistd.h>
|
|
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <sys/stat.h>
|
|
|
|
#if !HAVE_READLINK
|
|
|
|
/* readlink() substitute for systems that don't have a readlink() function,
|
|
such as DJGPP 2.03 and mingw32. */
|
|
|
|
ssize_t
|
|
readlink (char const *file, _GL_UNUSED char *buf,
|
|
_GL_UNUSED size_t bufsize)
|
|
{
|
|
struct stat statbuf;
|
|
|
|
/* In general we should use lstat() here, not stat(). But on platforms
|
|
without symbolic links, lstat() - if it exists - would be equivalent to
|
|
stat(), therefore we can use stat(). This saves us a configure check. */
|
|
if (stat (file, &statbuf) >= 0)
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
#else /* HAVE_READLINK */
|
|
|
|
# undef readlink
|
|
|
|
/* readlink() wrapper that uses correct types, for systems like cygwin
|
|
1.5.x where readlink returns int, and which rejects trailing slash,
|
|
for Solaris 9. */
|
|
|
|
ssize_t
|
|
rpl_readlink (char const *file, char *buf, size_t bufsize)
|
|
{
|
|
# if READLINK_TRAILING_SLASH_BUG
|
|
size_t file_len = strlen (file);
|
|
if (file_len && file[file_len - 1] == '/')
|
|
{
|
|
/* Even if FILE without the slash is a symlink to a directory,
|
|
both lstat() and stat() must resolve the trailing slash to
|
|
the directory rather than the symlink. We can therefore
|
|
safely use stat() to distinguish between EINVAL and
|
|
ENOTDIR/ENOENT, avoiding extra overhead of rpl_lstat(). */
|
|
struct stat st;
|
|
if (stat (file, &st) == 0 || errno == EOVERFLOW)
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
# endif /* READLINK_TRAILING_SLASH_BUG */
|
|
|
|
ssize_t r = readlink (file, buf, bufsize);
|
|
|
|
# if READLINK_TRUNCATE_BUG
|
|
if (r < 0 && errno == ERANGE)
|
|
{
|
|
/* Try again with a bigger buffer. This is just for test cases;
|
|
real code invariably discards short reads. */
|
|
char stackbuf[4032];
|
|
r = readlink (file, stackbuf, sizeof stackbuf);
|
|
if (r < 0)
|
|
{
|
|
if (errno == ERANGE)
|
|
{
|
|
/* Clear the buffer, which is good enough for real code.
|
|
Thankfully, no test cases try short reads of enormous
|
|
symlinks and what would be the point anyway? */
|
|
r = bufsize;
|
|
memset (buf, 0, r);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (bufsize < r)
|
|
r = bufsize;
|
|
memcpy (buf, stackbuf, r);
|
|
}
|
|
}
|
|
# endif
|
|
|
|
# if defined __CYGWIN__
|
|
/* On Cygwin 3.3.6, readlink("/dev/null") returns "\\Device\\Null", which
|
|
is unusable. Better fail with EINVAL. */
|
|
if (r > 0 && strncmp (file, "/dev/", 5) == 0 && buf[0] == '\\')
|
|
{
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
# endif
|
|
|
|
return r;
|
|
}
|
|
|
|
#endif /* HAVE_READLINK */
|