feat(libkernel): implement lstat

core/libs/prx/libkernel/File/include/NativeStat.hpp

@@ -9,6 +9,7 @@ namespace File {
 void FillFileStat(const std::filesystem::path& nativePath, FileStat* sb);
 void FillFileStat(int nativeDescriptor, FileStat* sb);
 bool FillFileStatFromDescriptor(int fd, FileStat* sb);
+bool FillLinkStat(const std::filesystem::path& nativePath, FileStat* sb);
 
 }
 

core/libs/prx/libkernel/File/src/NativeStat.cpp

@@ -1,5 +1,6 @@
 #include "prx/libkernel/File/include/NativeStat.hpp"
 #include "prx/libkernel/File/include/DirectoryDescriptor.hpp"
+#include "prx/libc/include/General.hpp"
 
 #include <stdexcept>
 #include <string>
@@ -15,6 +16,11 @@ static int DoFstat(int fd, NativeStat* st) {
     if (const auto directory = File::DirectoryDescriptorPath(fd)) return DoStat(*directory, st);
     return _fstat64(fd, st);
 }
+static int DoLstat(const std::filesystem::path& p, NativeStat* st) {
+    std::error_code error;
+    if (std::filesystem::is_symlink(std::filesystem::symlink_status(p, error))) NotImplemented_nid_no_patch("lstat of a Windows symbolic link");
+    return DoStat(p, st);
+}
 #else
 #include <sys/stat.h>
 using NativeStat = struct stat;
@@ -24,6 +30,9 @@ static int DoStat(const std::filesystem::path& p, NativeStat* st) {
 static int DoFstat(int fd, NativeStat* st) {
     return ::fstat(fd, st);
 }
+static int DoLstat(const std::filesystem::path& p, NativeStat* st) {
+    return ::lstat(p.c_str(), st);
+}
 #endif
 
 static void CopyNativeStat(const NativeStat& st, FileStat* sb) {
@@ -99,4 +108,11 @@ bool FillFileStatFromDescriptor(int fd, FileStat* sb) {
     return true;
 }
 
+bool FillLinkStat(const std::filesystem::path& nativePath, FileStat* sb) {
+    NativeStat st{};
+    if (DoLstat(nativePath, &st) != 0) return false;
+    CopyNativeStat(st, sb);
+    return true;
+}
+
 }

core/libs/prx/libkernel/File/src/Stdio.cpp

@@ -400,6 +400,13 @@ int APS5_VABI stat_nid_postfix(const char* path, FileStat* sb) {
     return PosixResult(sceKernelStat(path, sb));
 }
 
+int APS5_VABI lstat_nid_postfix(const char* path, FileStat* sb) {
+    if (sb == nullptr) return PosixFailure(GUEST_EFAULT);
+    if (const int error = PathError(path)) return PosixFailure(error);
+    if (!File::FillLinkStat(ResolvePath_nid_no_patch(path), sb)) return PosixResult(SceErrorFromErrno(errno));
+    return 0;
+}
+
 int APS5_VABI unlink_nid_postfix(const char* path) {
     if (const int error = PathError(path)) return PosixFailure(error);
     return PosixResult(sceKernelUnlink(path));

core/libs/tests/GuestFilesystem.cpp

@@ -28,6 +28,7 @@ int APS5_VABI open_nid_postfix(const char*, int, int);
 int APS5_VABI _open_nid_postfix(const char*, int, ...);
 int APS5_VABI close_nid_postfix(int);
 int APS5_VABI stat_nid_postfix(const char*, FileStat*);
+int APS5_VABI lstat_nid_postfix(const char*, FileStat*);
 int APS5_VABI unlink_nid_postfix(const char*);
 int APS5_VABI rmdir_nid_postfix(const char*);
 int APS5_VABI mkdir_nid_postfix(const char*, unsigned short);
@@ -175,6 +176,27 @@ int main() {
     Require(stat_nid_postfix("", &status) == -1 && *__error_nid_postfix() == 2);
     Require(stat_nid_postfix(nullptr, &status) == -1 && *__error_nid_postfix() == 14);
     Require(stat_nid_postfix(presentName.c_str(), nullptr) == -1 && *__error_nid_postfix() == 14);
+    FileStat linkStatus{};
+    Require(lstat_nid_postfix(presentName.c_str(), &linkStatus) == 0 && linkStatus.st_size == 5);
+    Require((linkStatus.st_mode & 0170000) == 0100000 && linkStatus.st_ino == status.st_ino);
+    Require(lstat_nid_postfix(rootName.c_str(), &linkStatus) == 0 && (linkStatus.st_mode & 0170000) == 0040000);
+    Require(lstat_nid_postfix(missingName.c_str(), &linkStatus) == -1 && *__error_nid_postfix() == 2);
+    Require(lstat_nid_postfix("", &linkStatus) == -1 && *__error_nid_postfix() == 2);
+    Require(lstat_nid_postfix(nullptr, &linkStatus) == -1 && *__error_nid_postfix() == 14);
+    Require(lstat_nid_postfix(presentName.c_str(), nullptr) == -1 && *__error_nid_postfix() == 14);
+#ifndef _WIN32
+    const auto link = root / "link";
+    std::filesystem::create_symlink("present.txt", link);
+    Require(lstat_nid_postfix(link.string().c_str(), &linkStatus) == 0);
+    Require((linkStatus.st_mode & 0170000) == 0120000 && linkStatus.st_size == 11);
+    Require(stat_nid_postfix(link.string().c_str(), &status) == 0 && (status.st_mode & 0170000) == 0100000);
+    const auto dangling = root / "dangling";
+    std::filesystem::create_symlink("missing.txt", dangling);
+    Require(lstat_nid_postfix(dangling.string().c_str(), &linkStatus) == 0 && (linkStatus.st_mode & 0170000) == 0120000);
+    Require(stat_nid_postfix(dangling.string().c_str(), &status) == -1 && *__error_nid_postfix() == 2);
+    Require(lstat_nid_postfix((root / "present.txt" / "child").string().c_str(), &linkStatus) == -1 && *__error_nid_postfix() == 20);
+    Require(unlink_nid_postfix(link.string().c_str()) == 0 && unlink_nid_postfix(dangling.string().c_str()) == 0);
+#endif
     const int opened = open_nid_postfix(presentName.c_str(), 0, 0);
     Require(opened >= 0 && close_nid_postfix(opened) == 0);
     const int reopened = _open_nid_postfix(presentName.c_str(), 0);