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vfprintf
========

Syntax
------

     #include <stdio.h>
     #include <stdarg.h>
     
     int vfprintf(FILE *file, const char *format, va_list arguments);

Description
-----------

Sends formatted output from the ARGUMENTS to the FILE.  printf:.   

Return Value
------------

The number of characters written.

Example
-------

     void my_errmsg(char *format, ...)
     {
       va_list arg;
     
       va_start(arg, format);
       fprintf(stderr, "my_errmsg: ");
       vfprintf(stderr, format, arg);
       va_end(arg);
     }