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- Polyfill readlink("foo/") dir check on Windows
- Support asynchronous signal delivery on Windows
- Restore Windows Console from execve() daisy chain
- Work around bug in AARCH64 Optimized Routines memcmp()
- Disable unbourne.com shell completion on Windows for now
- Don't always set virtual terminal input state on console
- Remove Musl Libc's unusual preservation of realpath("//")
- Make realpath() strongly link malloc() to pass configure test
- Delete cosh.com shell, now that unbourne.com works on Windows!
This commit is contained in:
Justine Tunney 2023-09-06 22:39:36 -07:00
parent f9c9a323fe
commit 425c055116
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GPG key ID: BE714B4575D6E328
40 changed files with 581 additions and 706 deletions
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60
libc/calls/readlinkat-nt.c
View file

@ -20,8 +20,11 @@
#include "libc/intrin/strace.internal.h"
#include "libc/mem/alloca.h"
#include "libc/nt/createfile.h"
#include "libc/nt/enum/accessmask.h"
#include "libc/nt/enum/creationdisposition.h"
#include "libc/nt/enum/fileflagandattributes.h"
#include "libc/nt/enum/filesharemode.h"
#include "libc/nt/enum/filetype.h"
#include "libc/nt/enum/fsctl.h"
#include "libc/nt/enum/io.h"
#include "libc/nt/files.h"
@ -34,28 +37,45 @@
textwindows ssize_t sys_readlinkat_nt(int dirfd, const char *path, char *buf,
size_t bufsiz) {
char16_t path16[PATH_MAX];
if (__mkntpathat(dirfd, path, 0, path16) == -1) return -1;
size_t len = strlen16(path16);
bool must_be_directory = len > 1 && path16[len - 1] == '\\';
if (must_be_directory) path16[--len] = 0;
int64_t h;
ssize_t rc;
uint64_t w;
wint_t x, y;
volatile char *memory;
uint32_t i, j, n, mem;
char16_t path16[PATH_MAX], *p;
struct NtReparseDataBuffer *rdb;
if (__mkntpathat(dirfd, path, 0, path16) == -1) return -1;
mem = 16384;
memory = alloca(mem);
uint32_t mem = 16384;
volatile char *memory = alloca(mem);
CheckLargeStackAllocation((char *)memory, mem);
rdb = (struct NtReparseDataBuffer *)memory;
if ((h = CreateFile(path16, 0, 0, 0, kNtOpenExisting,
struct NtReparseDataBuffer *rdb = (struct NtReparseDataBuffer *)memory;
if ((h = CreateFile(path16, kNtFileReadAttributes,
kNtFileShareRead | kNtFileShareWrite | kNtFileShareDelete,
0, kNtOpenExisting,
kNtFileFlagOpenReparsePoint | kNtFileFlagBackupSemantics,
0)) != -1) {
if (DeviceIoControl(h, kNtFsctlGetReparsePoint, 0, 0, rdb, mem, &n, 0)) {
// if path had trailing slash, assert last component is directory
if (must_be_directory) {
struct NtByHandleFileInformation wst;
if (GetFileType(h) != kNtFileTypeDisk ||
(GetFileInformationByHandle(h, &wst) &&
!(wst.dwFileAttributes & kNtFileAttributeDirectory))) {
return enotdir();
}
}
uint32_t bc;
if (DeviceIoControl(h, kNtFsctlGetReparsePoint, 0, 0, rdb, mem, &bc, 0)) {
if (rdb->ReparseTag == kNtIoReparseTagSymlink) {
i = 0;
j = 0;
n = rdb->SymbolicLinkReparseBuffer.PrintNameLength / sizeof(char16_t);
p = (char16_t *)((char *)rdb->SymbolicLinkReparseBuffer.PathBuffer +
uint32_t i = 0;
uint32_t j = 0;
uint32_t n =
rdb->SymbolicLinkReparseBuffer.PrintNameLength / sizeof(char16_t);
char16_t *p =
(char16_t *)((char *)rdb->SymbolicLinkReparseBuffer.PathBuffer +
rdb->SymbolicLinkReparseBuffer.PrintNameOffset);
if (n >= 3 && isalpha(p[0]) && p[1] == ':' && p[2] == '\\') {
p[1] = p[0];
@ -63,15 +83,18 @@ textwindows ssize_t sys_readlinkat_nt(int dirfd, const char *path, char *buf,
p[2] = '/';
}
while (i < n) {
x = p[i++] & 0xffff;
wint_t x = p[i++] & 0xffff;
if (!IsUcs2(x)) {
if (i < n) {
y = p[i++] & 0xffff;
wint_t y = p[i++] & 0xffff;
x = MergeUtf16(x, y);
} else {
x = 0xfffd;
}
}
uint64_t w;
if (x < 0200) {
if (x == '\\') {
x = '/';
@ -95,6 +118,7 @@ textwindows ssize_t sys_readlinkat_nt(int dirfd, const char *path, char *buf,
} else {
rc = -1;
}
CloseHandle(h);
} else {
rc = __fix_enotdir(-1, path16);