usr/src/lib/libcurses/screen/vwprintw.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1988 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 /*
  31  * University Copyright- Copyright (c) 1982, 1986, 1988
  32  * The Regents of the University of California
  33  * All Rights Reserved
  34  *
  35  * University Acknowledgment- Portions of this document are derived from
  36  * software developed by the University of California, Berkeley, and its
  37  * contributors.
  38  */
  39
  40 #pragma ident   "%Z%%M% %I%     %E% SMI"
  41
  42 /*LINTLIBRARY*/
  43
  44 /*
  45  * printw and friends
  46  *
  47  */
  48
  49 #include        <sys/types.h>
  50 #include        <stdlib.h>
  51 #include        "curses_inc.h"
  52 #include        <stdarg.h>
  53
  54 /*
  55  *      This routine actually executes the printf and adds it to the window
  56  *
  57  *      This code now uses the vsprintf routine, which portably digs
  58  *      into stdio.  We provide a vsprintf for older systems that don't
  59  *      have one.
  60  */
  61
  62 /*VARARGS2*/
  63 int
  64 vwprintw(WINDOW *win, char *fmt, va_list ap)
  65 {
  66         int size = BUFSIZ;
  67         char *buffer;
  68         int n, rv;
  69
  70         buffer = (char *) malloc(size);
  71         if (buffer == NULL)
  72                 return (ERR);
  73         /*CONSTCOND*/
  74         while (1) {
  75                 n = vsnprintf(buffer, size, fmt, ap);
  76                 if (n < size)
  77                         break;
  78                 size *= 2;
  79                 buffer = (char *) realloc(buffer, size);
  80                 if (buffer == NULL)
  81                         return (ERR);
  82         }
  83         va_end(ap);
  84         rv = waddstr(win, buffer);
  85         free(buffer);
  86         return (rv);
  87 }