fastfetch/src/common/impl/path.c at dev · fastfetch-cli/fastfetch · GitHub

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#include "common/path.h"

#include "common/io.h"

#include "common/arrutil.h"

#if !_WIN32

const char* ffFindExecutableInPath(const char* name, FFstrbuf* result) {

char* path = getenv("PATH");

if (!path) {

return "$PATH not set";

}

#ifdef _WIN32

const bool appendExe = !ffStrEndsWithIgnCase(name, ".exe");

#endif

for (char* token = path; *token; path = token + 1) {

token = strchr(path,

#ifdef _WIN32

';'

#else

':'

#endif

);

if (!token) {

token = path + strlen(path);

}

ffStrbufSetNS(result, (uint32_t) (token - path), path);

ffStrbufEnsureEndsWithC(result,

#ifdef _WIN32

'\\'

#else

'/'

#endif

);

ffStrbufAppendS(result, name);

#ifdef _WIN32

if (appendExe) {

ffStrbufAppendS(result, ".exe");

}

if (!ffPathExists(result->chars, FF_PATHTYPE_FILE)) {

continue;

}

#else

if (access(result->chars, X_OK) != 0) {

continue;

}

#endif

return nullptr;

}

ffStrbufClear(result);

return "Executable not found";

}

#else

#include <windows.h>

#include <winioctl.h>

#include <errno.h>

#include <stdalign.h>

const char* ffFindExecutableInPath(const char* name, FFstrbuf* result) {

char buffer[MAX_PATH + 1];

DWORD length = SearchPathA(nullptr, name, ".exe", sizeof(buffer), buffer, nullptr);

if (length == 0) {

ffStrbufClear(result);

return "Executable not found";

}

ffStrbufSetS(result, buffer);

return nullptr;

}

static inline int winerr2Errno(DWORD err) {

switch (err) {

case ERROR_FILE_NOT_FOUND:

case ERROR_PATH_NOT_FOUND:

case ERROR_INVALID_NAME:

return ENOENT;

case ERROR_ACCESS_DENIED:

case ERROR_SHARING_VIOLATION:

case ERROR_LOCK_VIOLATION:

return EACCES;

case ERROR_BUFFER_OVERFLOW:

case ERROR_INSUFFICIENT_BUFFER:

return ENAMETOOLONG;

case ERROR_INVALID_PARAMETER:

case ERROR_NOT_A_REPARSE_POINT:

return EINVAL;

default:

return EIO;

}

char* frealpath(HANDLE hFile, char* resolved_name) {

if (__builtin_expect(hFile == INVALID_HANDLE_VALUE || !hFile, false)) {

errno = EINVAL;

return nullptr;

}

wchar_t resolvedNameW[MAX_PATH + 4]; /* +4 for "\\\\?\\" prefix */

DWORD lenW = GetFinalPathNameByHandleW(hFile, resolvedNameW, (DWORD) ARRAY_SIZE(resolvedNameW), FILE_NAME_NORMALIZED);

if (lenW == 0) {

errno = winerr2Errno(GetLastError());

return nullptr;

}

if (lenW >= ARRAY_SIZE(resolvedNameW)) {

errno = E2BIG;

return nullptr;

}

lenW++; // Include null terminator

wchar_t* srcW = resolvedNameW;

DWORD srcLenW = lenW;

if (srcLenW >= 8 && wcsncmp(resolvedNameW, L"\\\\?\\UNC\\", 8) == 0) {

/* Convert "\\?\UNC\server\share" to "\\server\share" */

srcW += 6;

srcLenW -= 6;

*srcW = L'\\';

} else if (srcLenW >= 4 && wcsncmp(resolvedNameW, L"\\\\?\\", 4) == 0) {

srcW += 4;

srcLenW -= 4;

}

if (resolved_name) {

ULONG outBytes = 0;

if (!NT_SUCCESS(RtlUnicodeToUTF8N(resolved_name, MAX_PATH, &outBytes, srcW, (ULONG) (srcLenW * sizeof(wchar_t))))) {

errno = E2BIG;

return nullptr;

}

} else {

/* UTF-8 worst-case: up to 4 bytes per UTF-16 code unit */

char tmp[(MAX_PATH + 4) * 4];

ULONG outBytes = 0;

if (!NT_SUCCESS(RtlUnicodeToUTF8N(tmp, (ULONG) sizeof(tmp), &outBytes, srcW, (ULONG) (srcLenW * sizeof(wchar_t))))) {

errno = E2BIG;

return nullptr;

}

resolved_name = (char*) malloc(outBytes);

if (!resolved_name) {

errno = ENOMEM;

return nullptr;

}

memcpy(resolved_name, tmp, outBytes);

}

return resolved_name;

}

char* realpath(const char* __restrict file_name, char* __restrict resolved_name) {

if (!file_name) {

errno = EINVAL;

return nullptr;

}

wchar_t fileNameW[MAX_PATH];

ULONG lenBytes = 0;

if (!NT_SUCCESS(RtlUTF8ToUnicodeN(fileNameW, (ULONG) sizeof(fileNameW), &lenBytes, file_name, (ULONG) strlen(file_name) + 1))) {

errno = EINVAL;

return nullptr;

}

FF_AUTO_CLOSE_FD HANDLE hFile = CreateFileW(

fileNameW,

FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,

nullptr,

OPEN_EXISTING,

FILE_FLAG_BACKUP_SEMANTICS,

nullptr);

if (hFile == INVALID_HANDLE_VALUE) {

errno = winerr2Errno(GetLastError());

return nullptr;

}

return frealpath(hFile, resolved_name);

}

ssize_t freadlink(HANDLE hFile, char* buf, size_t bufsiz) {

if (__builtin_expect(hFile == INVALID_HANDLE_VALUE || !buf || bufsiz == 0, false)) {

errno = EINVAL;

return -1;

}

alignas(REPARSE_DATA_BUFFER) BYTE reparseBuf[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];

DWORD bytesReturned = 0;

if (!DeviceIoControl(hFile, FSCTL_GET_REPARSE_POINT, nullptr, 0, reparseBuf, (DWORD) sizeof(reparseBuf), &bytesReturned, nullptr)) {

errno = winerr2Errno(GetLastError());

return -1;

}

REPARSE_DATA_BUFFER* rp = (REPARSE_DATA_BUFFER*) reparseBuf;

const wchar_t* targetW = nullptr;

USHORT targetBytes = 0;

if (rp->ReparseTag == IO_REPARSE_TAG_SYMLINK) {

if (rp->SymbolicLinkReparseBuffer.PrintNameLength > 0) {

targetW = rp->SymbolicLinkReparseBuffer.PathBuffer +

(rp->SymbolicLinkReparseBuffer.PrintNameOffset / sizeof(wchar_t));

targetBytes = rp->SymbolicLinkReparseBuffer.PrintNameLength;

} else {

targetW = rp->SymbolicLinkReparseBuffer.PathBuffer +

(rp->SymbolicLinkReparseBuffer.SubstituteNameOffset / sizeof(wchar_t));

targetBytes = rp->SymbolicLinkReparseBuffer.SubstituteNameLength;

if (targetBytes >= 8 &&

wcsncmp(targetW, L"\\??\\", 4) == 0) {

targetW += 4;

targetBytes -= 8;

}

} else if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT) {

if (rp->MountPointReparseBuffer.PrintNameLength > 0) {

targetW = rp->MountPointReparseBuffer.PathBuffer +

(rp->MountPointReparseBuffer.PrintNameOffset / sizeof(wchar_t));

targetBytes = rp->MountPointReparseBuffer.PrintNameLength;

} else {

targetW = rp->MountPointReparseBuffer.PathBuffer +

(rp->MountPointReparseBuffer.SubstituteNameOffset / sizeof(wchar_t));

targetBytes = rp->MountPointReparseBuffer.SubstituteNameLength;

if (targetBytes >= 8 &&

wcsncmp(targetW, L"\\??\\", 4) == 0) {

targetW += 4;

targetBytes -= 8;

}

} else {

errno = EINVAL;

return -1;

}

ULONG outBytes = 0;

if (!NT_SUCCESS(RtlUnicodeToUTF8N(buf, (ULONG) bufsiz, &outBytes, targetW, targetBytes))) {

errno = E2BIG;

return -1;

}

// Not null-terminated

return (ssize_t) outBytes;

}

ssize_t readlink(const char* path, char* buf, size_t bufsiz) {

if (!path || !buf || bufsiz == 0) {

errno = EINVAL;

return -1;

}

wchar_t pathW[MAX_PATH];

ULONG pathWBytes = 0;

if (!NT_SUCCESS(RtlUTF8ToUnicodeN(pathW, (ULONG) sizeof(pathW), &pathWBytes, path, (ULONG) strlen(path) + 1))) {

errno = EINVAL;

return -1;

}

FF_AUTO_CLOSE_FD HANDLE hFile = CreateFileW(

pathW,

FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,

nullptr,

OPEN_EXISTING,

FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OPEN_REPARSE_POINT,

nullptr);

if (hFile == INVALID_HANDLE_VALUE) {

errno = winerr2Errno(GetLastError());

return -1;

}

return freadlink(hFile, buf, bufsiz);

}

#endif

fastfetch/src/common/impl/path.c at dev · fastfetch-cli/fastfetch · GitHub

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