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 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
  61 get_window_size(int fd, int *lines, int *columns)
  62 {
  63     char *s;
  64
  65 #if defined(TIOCGWINSZ)
  66     {
  67         struct winsize ws;
  68         int ret;
  69         ret = ioctl(fd, TIOCGWINSZ, &ws);
  70         if (ret != -1) {
  71             if (lines)
  72                 *lines = ws.ws_row;
  73             if (columns)
  74                 *columns = ws.ws_col;
  75             return 0;
  76         }
  77     }
  78 #elif defined(TIOCGSIZE)
  79     {
  80         struct ttysize ts;
  81         int ret;
  82         ret = ioctl(fd, TIOCGSIZE, &ts);
  83         if (ret != -1) {
  84             if (lines)
  85                 *lines = ts.ws_lines;
  86             if (columns)
  87                 *columns = ts.ts_cols;
  88             return 0;
  89         }
  90     }
  91 #elif defined(HAVE__SCRSIZE)
  92     {
  93         int dst[2];
  94
  95         _scrsize(dst);
  96         if (lines)
  97             *lines = dst[1];
  98         if (columns)
  99             *columns = dst[0];
 100         return 0;
 101     }
 102 #elif defined(_WIN32)
 103     {
 104         intptr_t fh = 0;
 105         CONSOLE_SCREEN_BUFFER_INFO sb_info;
 106
 107         fh = _get_osfhandle(fd);
 108         if (fh != (intptr_t) INVALID_HANDLE_VALUE &&
 109             GetConsoleScreenBufferInfo((HANDLE) fh, &sb_info)) {
 110             if (lines)
 111                 *lines = 1 + sb_info.srWindow.Bottom - sb_info.srWindow.Top;
 112             if (columns)
 113                 *columns = 1 + sb_info.srWindow.Right - sb_info.srWindow.Left;
 114
 115             return 0;
 116         }
 117     }
 118 #endif
 119     if (columns) {
 120         if ((s = getenv("COLUMNS")))
 121             *columns = atoi(s);
 122         else
 123             return -1;
 124     }
 125     if (lines) {
 126         if ((s = getenv("LINES")))
 127             *lines = atoi(s);
 128         else
 129             return -1;
 130     }
 131     return 0;
 132 }