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Synopsis:
    #include <stdio.h>
    #include <stdarg.h>
    int vprintf( const char *format, va_list arg );

Description:
    The vprintf function writes output to the file  stdout under control of
    the argument format.  The format string is described under the
    description of the  printf function.  The vprintf function is equivalent
    to the  printf function, with the variable argument list replaced with
    arg, which has been initialized by the  va_start macro.

Returns:
    The vprintf function returns the number of characters written, or a
    negative value if an output error occurred.  When an error has occurred,
     errno contains a value indicating the type of error that has been
    detected.

See Also:
    _bprintf, cprintf, fprintf, printf, sprintf, va_arg, va_end, va_start,
    _vbprintf, vcprintf, vfprintf, vsprintf

Example:
    The following shows the use of vprintf in a general error message
    routine.

    #include <stdio.h>
    #include <stdarg.h>

    void errmsg( char *format, ... )
      {
        va_list arglist;

        printf( "Error: " );
        va_start( arglist, format );
        vprintf( format, arglist );
        va_end( arglist );
      }

    void main()
      {
        errmsg( "%s %d %s", "Failed", 100, "times" );
      }

Classification:
    ANSI

Systems:
    All