# libkcrt

**Repository Path**: mirrors_Chuyu-Team/libkcrt

## Basic Information

- **Project Name**: libkcrt
- **Description**: Provide an easy way to use C Run-time Library from Windows Kernel exported from ntdll.dll in your user-mode applications
- **Primary Language**: Unknown
- **License**: MIT
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2020-09-24
- **Last Updated**: 2026-01-24

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# libkcrt

libkcrt provides an easy way to use C Run-time Library from Windows Kernel 
exported from ntdll.dll in your user-mode applications.

I suggest you use [VC-LTL](https://github.com/Chuyu-Team/VC-LTL) for 
non-special cases, not the libkcrt.

**Under Construction**

## Todo list

- Add basic memory allocation support for C and C++.
- Without defining the entry point manually.
- Add static variable initialization support.

## Known Issues

- Run-Time Error Checks (/RTC) is not supported.
- C++ Exception Handling is not supported.

## Available CRT Functions

| Column 1   | Column 2    | Column 3 | Column 4  | Column 5 | Column 6 |
|------------|-------------|----------|-----------|----------|----------|
| __isascii  | _strnicmp   | atan     | iswdigit  | strchr   | vsprintf |
| __iscsym   | _strupr     | atoi     | iswlower  | strcmp   | wcscat   |
| __iscsymf  | _swprintf   | atol     | iswspace  | strcpy   | wcschr   |
| __toascii  | _ui64toa    | bsearch  | iswxdigit | strcspn  | wcscmp   |
| _atoi64    | _ui64tow    | ceil     | isxdigit  | strlen   | wcscpy   |
| _i64toa    | _ultoa      | cos      | labs      | strncat  | wcscspn  |
| _i64tow    | _ultow      | fabs     | log       | strncmp  | wcslen   |
| _itoa      | _vscwprintf | floor    | mbstowcs  | strncpy  | wcsncat  |
| _itow      | _vsnprintf  | isalnum  | memchr    | strpbrk  | wcsncmp  |
| _lfind     | _vsnwprintf | isalpha  | memcmp    | strrchr  | wcsncpy  |
| _ltoa      | _vswprintf  | iscntrl  | memcpy    | strspn   | wcspbrk  |
| _ltow      | _wcsicmp    | isdigit  | memmove   | strstr   | wcsrchr  |
| _memccpy   | _wcslwr     | isgraph  | memset    | strtol   | wcsspn   |
| _memicmp   | _wcsnicmp   | islower  | pow       | strtoul  | wcsstr   |
| _snprintf  | _wcstoui64  | isprint  | qsort     | swprintf | wcstol   |
| _snwprintf | _wcsupr     | ispunct  | sin       | tan      | wcstombs |
| _splitpath | _wtoi       | isspace  | sprintf   | tolower  | wcstoul  |
| _strcmpi   | _wtoi64     | isupper  | sqrt      | toupper  |          |
| _stricmp   | _wtol       | iswalpha | sscanf    | towlower |          |
| _strlwr    | abs         | iswctype | strcat    | towupper |          |

## License

libkcrt is distributed under the [MIT License](LICENSE).

But the object files in the source directory are extracted from Windows Software
Development Kit (BufferOverflow.lib), Windows Driver Kit (ntdllp.lib) and Visual
Studio (libcmt.lib), you need to comply with their licenses too.

## Chuyu Team