miniCRT

Lightweight Windows CRT replacement focused on reverse-engineering tools and minimal GUI usage.
This project implements a small C runtime layer, a minimal math stack, and fast string/memory routines without linking against the default CRT.

Overview

• Custom memory allocation and new/delete
• Minimal libc string/memory utilities
• Lightweight printf/snprintf formatting
• Math functions backed by fdlibm (subset)
• Windows-only build, optimized for small runtime dependencies

Project Layout

miniCRT/
  CMakeLists.txt
  src/
    CMakeLists.txt
    minicrt_alloc.c
    minicrt_errno.c
    minicrt_fltused.c
    minicrt_math_support.c
    minicrt_math_wrappers.c
    minicrt_mem.c
    minicrt_new.cpp
    minicrt_printf.c
    minicrt_string.c
    test_main.c
    vendor/
      fdlibm/
      musl/
      stb/

Build & Test

cmake -S C:\Users\YourPCName\Desktop\miniCRT -B C:\Users\YourPCName\Desktop\miniCRT\build
cmake --build C:\Users\YourPCName\Desktop\miniCRT\build --config Release --target minicrt_test

Run the test executable:

C:\Users\YourPCName\Desktop\miniCRT\build\src\Release\minicrt_test.exe

It shows a MessageBox with OK/FAIL and returns 0 on success.

Third-Party Code (Copied In-Tree)

• stb_sprintf (formatting): src/vendor/stb/stb_sprintf.h
• fdlibm (math subset): src/vendor/fdlibm/
• musl (memcpy/memmove/memset/memcmp): src/vendor/musl/

Licenses are included in the original upstream repositories; keep notice blocks in the copied files.