vprintf(3S)                DG/UX 4.30                 vprintf(3S)



     NAME
          vprintf, vfprintf, vsprintf - print formatted output of a
          varargs argument list

     SYNOPSIS
          #include <stdio.h>
          #include <varargs.h>

          int vprintf (format, ap)
          char *format;
          valist ap;

          int vfprintf (stream, format, ap)
          FILE *stream;
          char *format;
          valist ap;

          int vsprintf (s, format, ap)
          char *s, *format;
          valist ap;

     DESCRIPTION
          vprintf, vfprintf, and vsprintf are the same as printf,
          fprintf, and sprintf respectively, except that instead of
          being called with a variable number of arguments, they are
          called with an argument list as defined by varargs(5).

     EXAMPLE
          The following demonstrates the use of vfprintf to write an
          error routine.

          #include <stdio.h>
          #include <varargs.h>
               .
               .
               .
          /*
           *   error should be called like
           *      error(function_name, format, arg1, arg2...);  */
          /*VARARGS*/
          void
          error(va_alist)
          /* Note that the function_name and format arguments cannot be
           *    separately declared because of the definition of varargs.  */
          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 *));



     Licensed material--property of copyright holder(s)         Page 1

     vprintf(3S)                DG/UX 4.30                 vprintf(3S)



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

     SEE ALSO
          printf(3S), varargs(5).














































     Licensed material--property of copyright holder(s)         Page 2