Replace unsafe string operations (strcpy, strcat,
sprintf, vsprintf) with safe equivalents:
1. The one use of strcpy into an allocated buffer was
replaced with strdup.
2. The one use of strcat was replaced with a call to
memmove and explicitly setting the NUL terminating
byte.
3. sprintf()/vsprintf() calls were replaced with calls
to snprintf()/vsnprintf(), respectively.
Added a Makefile to build the library as, er, a library
and run the test suite.
Signed-off-by: Dan Cross <patchdev@fat-dragon.org>
