* ext/io/console/console.c (console_set_winsize): new method to set

  console size.  [EXPERIMENTAL]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@30751 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 59 insertions, 0 deletions

diff --git a/ext/io/console/console.c b/ext/io/console/console.c
index 299a0ccf36..f7f95e933f 100644
--- a/ext/io/console/console.c
+++ b/ext/io/console/console.c
@@ -357,6 +357,7 @@ console_echo_p(VALUE io)
 #if defined TIOCGWINSZ
 typedef struct winsize rb_console_size_t;
 #define getwinsize(fd, buf) (ioctl((fd), TIOCGWINSZ, (buf)) == 0)
+#define setwinsize(fd, buf) (ioctl((fd), TIOCSWINSZ, (buf)) == 0)
 #define winsize_row(buf) (buf)->ws_row
 #define winsize_col(buf) (buf)->ws_col
 #elif defined _WIN32
@@ -391,6 +392,63 @@ console_winsize(VALUE io)
     if (!getwinsize(fd, &ws)) rb_sys_fail(0);
     return rb_assoc_new(INT2NUM(winsize_row(&ws)), INT2NUM(winsize_col(&ws)));
 }
+
+/*
+ * call-seq:
+ *   io.winsize = [rows, columns]
+ *
+ * Tries to set console size.  The effect depends on the platform and
+ * the running environment.
+ */
+static VALUE
+console_set_winsize(VALUE io, VALUE size)
+{
+    rb_io_t *fptr;
+    rb_console_size_t ws;
+#if defined _WIN32
+    HANDLE wh;
+    int newrow, newcol;
+#endif
+    VALUE row, col, xpixel, ypixel;
+    int fd;
+
+    GetOpenFile(io, fptr);
+    size = rb_Array(size);
+    rb_scan_args(RARRAY_LEN(size), RARRAY_PTR(size), "22",
+                &row, &col, &xpixel, &ypixel);
+#if defined TIOCSWINSZ
+    fd = GetWriteFD(fptr);
+    ws.ws_row = ws.ws_col = ws.ws_xpixel = ws.ws_ypixel = 0;
+#define SET(m) ws.ws_##m = NIL_P(m) ? 0 : (unsigned short)NUM2UINT(m)
+    SET(row);
+    SET(col);
+    SET(xpixel);
+    SET(ypixel);
+#undef SET
+    if (!setwinsize(fd, &ws)) rb_sys_fail(0);
+#elif defined _WIN32
+    wh = (HANDLE)rb_w32_get_osfhandle(GetReadFD(fptr));
+    newrow = (SHORT)NUM2UINT(row);
+    newcol = (SHORT)NUM2UINT(col);
+    if (!getwinsize(GetReadFD(fptr), &ws)) {
+	rb_sys_fail("GetConsoleScreenBufferInfo");
+    }
+    if ((ws.dwSize.X < newcol && (ws.dwSize.X = newcol, 1)) ||
+	(ws.dwSize.Y < newrow && (ws.dwSize.Y = newrow, 1))) {
+	if (!(SetConsoleScreenBufferSize(wh, ws.dwSize) || SET_LAST_ERROR)) {
+	    rb_sys_fail("SetConsoleScreenBufferInfo");
+	}
+    }
+    ws.srWindow.Left = 0;
+    ws.srWindow.Top = 0;
+    ws.srWindow.Right = newcol;
+    ws.srWindow.Bottom = newrow;
+    if (!(SetConsoleWindowInfo(wh, FALSE, &ws.srWindow) || SET_LAST_ERROR)) {
+	rb_sys_fail("SetConsoleWindowInfo");
+    }
+#endif
+    return io;
+}
 #endif
 
 /*
@@ -547,6 +605,7 @@ InitVM_console(void)
     rb_define_method(rb_cIO, "echo?", console_echo_p, 0);
     rb_define_method(rb_cIO, "noecho", console_noecho, 0);
     rb_define_method(rb_cIO, "winsize", console_winsize, 0);
+    rb_define_method(rb_cIO, "winsize=", console_set_winsize, 1);
     rb_define_method(rb_cIO, "iflush", console_iflush, 0);
     rb_define_method(rb_cIO, "oflush", console_oflush, 0);
     rb_define_method(rb_cIO, "ioflush", console_ioflush, 0);