While converting source code from C to C++, I came up with difficulties in converting error handling routines like err_quit(),err_sys(),etc. Are there C++ versions of these functions and where can I find them?
These routines are not defined by the ANSI standard. You have to use a third-party library or implement them yourself. However, if you're already making a transition to C++, you want to consider the use of standard exception handling instead of C-style routines.