explain_vsnprintf_or_die - formatted output conversion and report errors

       libexplain version 1.4
       Copyright (C) 2010 Peter Miller

                                                                                     explain_vsnprintf_or_die(3)

       The  explain_vsnprintf_or_die  function  is  used  to  call  the  vsnprintf(3) system call. On failure an
       explanation will be printed to stderr, obtained from the  explain_vsnprintf(3)  function,  and  then  the
       process terminates by calling exit(EXIT_FAILURE).

       The  explain_vsnprintf_on_error  function  is  used  to  call the vsnprintf(3) system call. On failure an
       explanation will be printed to stderr, obtained from the explain_vsnprintf(3) function, but still returns
       to the caller.

       data    The data, exactly as to be passed to the vsnprintf(3) system call.

       data_size
               The data_size, exactly as to be passed to the vsnprintf(3) system call.

       format  The format, exactly as to be passed to the vsnprintf(3) system call.

       ap      The ap, exactly as to be passed to the vsnprintf(3) system call.

       The explain_vsnprintf_or_die function is intended to be used  in  a  fashion  similar  to  the  following
       example:
              int result = explain_vsnprintf_or_die(data, data_size, format, ap);

       explain_vsnprintf_or_die - formatted output conversion and report errors

       The explain_vsnprintf_or_die function only returns on success, see vsnprintf(3) for more information.  On
       failure, prints an explanation and exits, it does not return.

       The  explain_vsnprintf_on_error  function  always  returns  the  value return by the wrapped vsnprintf(3)
       system call.

vsnprintf(3)
               formatted output conversion

       explain_vsnprintf(3)
               explain vsnprintf(3) errors

       exit(2) terminate the calling process

       #include <libexplain/vsnprintf.h>
       int explain_vsnprintf_or_die(char *data, size_t data_size, const char *format, va_list ap);
       int explain_vsnprintf_on_error(char *data, size_t data_size, const char *format, va_list ap);