Mingw32 Alternate C Runtime Library Implementation Details

• Implement using Win32 APIs
• Accept the forward-slash instead of the standard backslash in the filename parameter in any call requiring the filename
• Accept UNC pathnames in all filename parameters
• Treat the case of input-filenames using Win32 conventions
• Use backslashes in all filenames returned from a call or written in any buffers passed to that call within that call
• Conversion between Win32 (returned by GetLastError() call) and ANSI/POSIX (set in errno variable) error codes
• Also support errno variable where otherwise required by ANSI standard
• Make library 100% ANSI/ISO compliant, including wide-character/Unicode functions, locale functions, and ISO C99 functions
• Implement malloc, calloc, free, and realloc using Win32 memory fuctions
• Make library compatible with both console and GUI applications
• If an application implements WinMain and/or wWinMain, it is an GUI application
• If an application implements main and/or wmain, it is an console application
• Implement the appropriate CRT startup code (mainCRTStartup, wmainCRTStartup, WinMainCRTStartup, wWinMainCRTStartup, DllMainCRTStartup) for console applications, GUI applications, and Dynamic Link Libraries (DLLs).
• Make all functions in this C Runtime Library multi-thread safe
• Support multiple locales
• Make source compatible with GCC, Binutils, GNU Make, GNU gzip, GNU tar, and bzip2
• Ensure compatibility with existing Mingw32 applications, including C++ applications
• Ensure compatibility with GNU C++ library, including dynamic versions
• Write an exception handler and install it in the exception handler list at fs:[0]. Click here to view exception handling details.
• In the default custom exception handler, translate exceptions to the corresponding ANSI signals
• Support the SIGINT signal using the following:
• Add a default custom SetConsoleCtrlHandler routine in the CRT startup code of console applications
• In the default custom SetConsoleCtrlHandler routine, raise a SIGINT signal if necessary
• Support all other signals required by the current ANSI/ISO standard
• Support all math functions required by the ANSI/ISO standard, the ISO C99 standard, or the POSIX standard, including complex number operations
• Fully support the FPU in any IA-32 or AMD x86-64 version
• Fully support the floating-point capabilities of the processor in all other processor versions
• Support Windows 95, Windows 98, Windows Me, Windows XP Home Edition, Windows NT 4.0, Windows 2000, Windows XP Professional, and Windows .NET Server
• NEVER MAKE ANY FUNCTIONS DEPENDENT ON ANY VERSION OF THE MICROSOFT C RUNTIME LIBRARY OR THE CYGWIN DLL
• Support __argc, __argv, __wargv, _environ, and _wenviron in both Console and GUI builds (can be implemented using macros)
• Make all C source files compilable with GCC
• Make all assembly files compilable with GAS
• Use no C++ in source files
• Make DLL and static versions of the runtime library
• Make compatible with the Win32 API header files in the current version of the Microsoft Platform SDK and the Win32 API header files in the current Mingw32 Runtime Library

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