lib/roken/get_window_size.c

   1 /*
   2  * Copyright (c) 1995, 1996, 1997, 1998 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include <config.h>
  35
  36 #include <stdlib.h>
  37 #ifdef HAVE_UNISTD_H
  38 #include <unistd.h>
  39 #endif
  40 #ifdef HAVE_SYS_TYPES_H
  41 #include <sys/types.h>
  42 #endif
  43
  44 #if 0 /* Where were those needed? /confused */
  45 #ifdef HAVE_SYS_PROC_H
  46 #include <sys/proc.h>
  47 #endif
  48
  49 #ifdef HAVE_SYS_TTY_H
  50 #include <sys/tty.h>
  51 #endif
  52 #endif
  53
  54 #ifdef HAVE_TERMIOS_H
  55 #include <termios.h>
  56 #endif
  57
  58 #include "roken.h"
  59
  60 int ROKEN_LIB_FUNCTION
  61 get_window_size(int fd, struct winsize *wp)
  62 {
  63     int ret = -1;
  64
  65     memset(wp, 0, sizeof(*wp));
  66
  67 #if defined(TIOCGWINSZ)
  68     ret = ioctl(fd, TIOCGWINSZ, wp);
  69 #elif defined(TIOCGSIZE)
  70     {
  71         struct ttysize ts;
  72
  73         ret = ioctl(fd, TIOCGSIZE, &ts);
  74         if(ret == 0) {
  75             wp->ws_row = ts.ts_lines;
  76             wp->ws_col = ts.ts_cols;
  77         }
  78     }
  79 #elif defined(HAVE__SCRSIZE)
  80     {
  81         int dst[2];
  82
  83         _scrsize(dst);
  84         wp->ws_row = dst[1];
  85         wp->ws_col = dst[0];
  86         ret = 0;
  87     }
  88 #endif
  89     if (ret != 0) {
  90         char *s;
  91         if((s = getenv("COLUMNS")))
  92             wp->ws_col = atoi(s);
  93         if((s = getenv("LINES")))
  94             wp->ws_row = atoi(s);
  95         if(wp->ws_col > 0 && wp->ws_row > 0)
  96             ret = 0;
  97     }
  98     return ret;
  99 }