vprintf(3S)															       vprintf(3S)

NAME

       vprintf(), vfprintf(), vsprintf(), vsnprintf() - print formatted output of a varargs argument list

SYNOPSIS


DESCRIPTION

       and  are  the  same  as	and respectively, except that instead of being called with a variable number of arguments, they are called with an
       argument list as defined by

RETURN VALUE

       Each function returns the number of bytes transmitted (excluding the null byte character in the case of or a negative value  if	an  output
       error was encountered.

       By default, returns a negative value if maxsize is smaller than the number of characters formatted.  In the UNIX 2003 standards environment
       (see standards(5)) it returns the number of bytes that would have been written to buffer s, excluding the terminating null byte, if maxsize
       had been sufficiently large.

EXAMPLES

       The following demonstrates how could be used to write an error routine:

	      #include <stdarg.h>
	      #include <stdio.h>
		  .
		  .
		  .
	      /*
	       *  error should be called using the form:
	       *      error(function_name, format, arg1, arg2...);
	       */

	      /*VARARGS0*/
	      void
	      error(va_alist)
	      va_dcl
	      {
		  va_list args;
		  char *fmt;

		  va_start(args);

		  /* print out name of function causing error */
		  (void)fprintf(stderr, "ERROR in %s: ", va_arg(args, char *));
		  fmt = va_arg(args, char *);

		  /* print out remainder of message */
		  (void)vfprintf(stderr, fmt, args);
		  va_end(args);
		  (void)abort( );
	      }

SEE ALSO

       setlocale(3C), printf(3S), standards(5), thread_safety(5), varargs(5), glossary(9).

STANDARDS CONFORMANCE

																       vprintf(3S)