explain_vsprintf_or_die - formatted output conversion and report errors

       libexplain version 1.4
       Copyright (C) 2010 Peter Miller

                                                                                      explain_vsprintf_or_die(3)

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

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

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

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

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

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

       explain_vsprintf_or_die - formatted output conversion and report errors

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

       The explain_vsprintf_on_error function always returns the value return by the wrapped vsprintf(3)  system
       call.

vsprintf(3)
               formatted output conversion

       explain_vsprintf(3)
               explain vsprintf(3) errors

       exit(2) terminate the calling process

       #include <libexplain/vsprintf.h>
       int explain_vsprintf_or_die(char *data, const char *format, va_list ap);
       int explain_vsprintf_on_error(char *data, const char *format, va_list ap);