vpfmt(3C)						   Standard C Library Functions 						 vpfmt(3C)

NAME

       vpfmt - display error message in standard format and pass to logging and monitoring services

SYNOPSIS

       #include <pfmt.h>
       #include <stdarg.h>

       int vpfmt(FILE *stream, long flag, const char *format, va_list ap);

DESCRIPTION

       The vpfmt() function is identical to pfmt(3C), except that it is called with an argument list as defined by <stdarg.h>.

       The  <stdarg.h>	header	defines  the type va_list and a set of macros for advancing through a list of arguments whose number and types may
       vary. The ap argument is of type va_list. This argument is used	with  the  <stdarg.h>  macros  va_start(),  va_arg(),  and  va_end().  See
       stdarg(3EXT).  The example in the EXAMPLES section below demonstrates their use with vpfmt().

RETURN VALUES

       Upon  successful  completion,  vpfmt()  returns	the  number of bytes transmitted.  Otherwise, -1 is returned if there was a write error to
       stream.

EXAMPLES

       Example 1: Use of vpfmt() to write an error routine.

       The following example demonstrates how vpfmt() could be used to write an error() routine. The va_alist() macro is  used	as  the  parameter
       list in a function definition. The va_start(ap, ...)  call, where ap is of type va_list, must be invoked before any attempt to traverse and
       access unnamed arguments. Calls to va_arg(ap, atype) traverse the argument list. Each execution of va_arg() expands to an  expression  with
       the  value and type of the next argument in the list ap, which is the same object initialized by va_start(). The atype argument is the type
       that the returned argument is expected to be. The va_end(ap) macro must be invoked when all desired arguments have been accessed. The argu-
       ment  list  in  ap can be traversed again if va_start() is called again after va_end(). In the example below, va_arg() is executed first to
       retrieve the format string passed to error(). The remaining error() arguments (arg1, arg2, ...) are passed to vpfmt() in the argument ap.

       #include <pfmt.h>
       #include <stdarg.h>
       /*
	*   error should be called like
	*	  error(format, arg1, ...);
	*/
       void error(...)
       {
	       va_list ap;
	       char *format;
	       va_start(ap, );
	       format = va_arg(ap, char *);
	       (void) vpfmt(stderr, MM_ERROR, format, ap);
	       va_end(ap);
	       (void) abort();
       }

USAGE

       Since vpfmt() uses gettxt(3C), it is recommended that vpfmt() not be used.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       gettxt(3C), pfmt(3C), attributes(5), stdarg(3EXT)

SunOS 5.10							    29 Dec 1996 							 vpfmt(3C)