CRT functions alternative

Hello I'm developing my tools in Visual C++ When i'm using standard C library functions the MSVCRT will be a dependency on my program, which is not desirable I'm looking for implementions of some C functions (see below) that only use functions from libraries such as kernel32, examples i've already got: malloc: void* malloc(size_t x) { void* a = HeapAlloc(GetProcessHeap(), 0, x); return a; } strstr: const char * strstr(const char *haystack, const char *needle) { unsigned int needle_len = lstrlen(needle); for (;*haystack;++haystack){ if (strncmp(haystack,needle,needle_len) == 0){ return haystack; } } return NULL; } I'm looking for FAST, FAIL-PROOF, LIGHTWEIGHT (NO 150 lines of code implementions of functions) implementions of the following functions: strtol - ([login to view URL]) sprintf (or _snprintf) - ([login to view URL]) sscanf - ([login to view URL])