mirror of
https://github.com/jart/cosmopolitan.git
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98 lines
4.5 KiB
C
98 lines
4.5 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/syscall_support-nt.internal.h"
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#include "libc/errno.h"
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#include "libc/nt/enum/fileflagandattributes.h"
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#include "libc/nt/enum/movefileexflags.h"
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#include "libc/nt/errors.h"
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#include "libc/nt/files.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/thunk/msabi.h"
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#include "libc/runtime/stack.h"
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#include "libc/str/str.h"
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#include "libc/sysv/errfuns.h"
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static textwindows bool StripTrailingSlash(char16_t *path) {
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size_t n = strlen16(path);
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bool had_trailing_slash = false;
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if (n > 1 && path[n - 1] == '\\') {
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had_trailing_slash = true;
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path[--n] = 0;
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}
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return had_trailing_slash;
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}
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textwindows int sys_renameat_nt(int olddirfd, const char *oldpath, int newdirfd,
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const char *newpath) {
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// translate unix to windows paths
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#pragma GCC push_options
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#pragma GCC diagnostic ignored "-Wframe-larger-than="
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struct {
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char16_t oldpath16[PATH_MAX];
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char16_t newpath16[PATH_MAX];
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} M;
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CheckLargeStackAllocation(&M, sizeof(M));
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#pragma GCC pop_options
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if (__mkntpathat(olddirfd, oldpath, 0, M.oldpath16) == -1 ||
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__mkntpathat(newdirfd, newpath, 0, M.newpath16) == -1) {
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return -1;
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}
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// strip trailing slash
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// win32 will einval otherwise
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// normally this is handled by __fix_enotdir()
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bool old_must_be_dir = StripTrailingSlash(M.oldpath16);
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bool new_must_be_dir = StripTrailingSlash(M.newpath16);
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// test for some known error conditions ahead of time
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// the enotdir check can't be done reactively
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// ideally we should resolve symlinks first
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uint32_t oldattr = GetFileAttributes(M.oldpath16);
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uint32_t newattr = GetFileAttributes(M.newpath16);
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if ((old_must_be_dir && oldattr != -1u &&
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!(oldattr & kNtFileAttributeDirectory)) ||
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(new_must_be_dir && newattr != -1u &&
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!(newattr & kNtFileAttributeDirectory))) {
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return enotdir();
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}
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if (oldattr != -1u && newattr != -1u) {
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if (!(oldattr & kNtFileAttributeDirectory) &&
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(newattr & kNtFileAttributeDirectory)) {
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return eisdir(); // new is directory, but old isn't a directory
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} else if ((oldattr & kNtFileAttributeDirectory) &&
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!(newattr & kNtFileAttributeDirectory)) {
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return enotdir(); // old is directory, but new isn't a directory
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} else if ((oldattr & kNtFileAttributeDirectory) &&
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(newattr & kNtFileAttributeDirectory)) {
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// both old and new are directories
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if (!RemoveDirectory(M.newpath16) &&
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GetLastError() == kNtErrorDirNotEmpty) {
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return enotempty();
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}
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}
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}
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if (MoveFileEx(M.oldpath16, M.newpath16, kNtMovefileReplaceExisting)) {
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return 0;
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} else {
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return __fix_enotdir3(-1, M.oldpath16, M.newpath16);
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}
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}
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