/**
* Print an error message with a detailed description, and optionally exit.
*
* This is a GNU extension.
*
* @etymology Report (error)!
*
* @param status The process will exit, with the function returning, with this
* exit status, unless it is zero. If zero, the process shall not exit.
* @param errnum The value of `errno` when the error occurred, zero if the a textual
* description of the error, further than that of `format`, shall not
* be printed.
* @param format Formatting-string for a detailed description of what happend.
* @param args Formatting-arguments for `format`.
*
* @since Always.
*/
void error(int status, int errnum, const char* format, ...)
{
va_list args;
va_start(args, format);
verror_at_line(status, errnum, NULL, 0, format, args);
va_end(args);
}
/* Print a message with 'vfprintf (stderr, FORMAT, ARGS)';
if ERRNUM is nonzero, follow it with ": " and strerror (ERRNUM).
If STATUS is nonzero, terminate the program with 'exit (STATUS)'.
Use the globals error_print_progname and error_message_count similarly
to error(). */
void
verror (int status, int errnum, const char *format, va_list args)
{
verror_at_line (status, errnum, NULL, 0, format, args);
}