Do not use curses to get terminal size

libncursesw.so is very difficult to bundle in the binary build and there
are now two major versions of it in use so.5 and so.6

So instead use an IOCTL directly. Should be faster as well :)

src/calibre/test_build.py

@@ -228,10 +228,9 @@ def test_podofo():
     print ('podofo OK!')
 
 def test_terminal():
-    import readline, curses
+    import readline
-    curses.setupterm()
     del readline
-    print ('readline and curses OK!')
+    print ('readline OK!')
 
 def test_markdown():
     from calibre.ebooks.markdown import Markdown

src/calibre/utils/terminal.py

@@ -325,23 +325,48 @@ def windows_terminfo():
         raise Exception('stdout is not a console?')
     return csbi
 
+def get_term_geometry():
+    import fcntl, termios, struct
+
+    def ioctl_GWINSZ(fd):
+        try:
+            return struct.unpack(b'hh', fcntl.ioctl(fd, termios.TIOCGWINSZ, b'1234'))
+        except Exception:
+            return None, None
+
+    for f in (sys.stdin, sys.stdout, sys.stderr):
+        lines, cols = ioctl_GWINSZ(f.fileno())
+        if lines is not None:
+            return lines, cols
+    try:
+        fd = os.open(os.ctermid(), os.O_RDONLY)
+        try:
+            lines, cols = ioctl_GWINSZ(fd)
+            if lines is not None:
+                return lines, cols
+        finally:
+            os.close(fd)
+    except Exception:
+        pass
+    return None, None
+
+
 def geometry():
     if iswindows:
         try:
 
             ti = windows_terminfo()
-            return (ti.dwSize.X or 80, ti.dwSize.Y or 80)
+            return (ti.dwSize.X or 80, ti.dwSize.Y or 25)
         except:
-            return 80, 80
+            return 80, 25
-    try:
-        import curses
-        curses.setupterm()
-    except:
-        return 80, 80
     else:
-        width = curses.tigetnum('cols') or 80
+        try:
-        height = curses.tigetnum('lines') or 80
+            lines, cols = get_term_geometry()
-        return width, height
+            if lines is not None:
+                return cols, lines
+        except Exception:
+            pass
+        return 80, 25
 
 def test():
     s = ANSIStream()