diff --git a/test/dump_window.c b/test/dump_window.c
new file mode 100644
index 0000000..eed4dbc
--- /dev/null
+++ b/test/dump_window.c
@@ -0,0 +1,179 @@
+/****************************************************************************
+ * Copyright 2018-2020,2023 Thomas E. Dickey                                *
+ *                                                                          *
+ * Permission is hereby granted, free of charge, to any person obtaining a  *
+ * copy of this software and associated documentation files (the            *
+ * "Software"), to deal in the Software without restriction, including      *
+ * without limitation the rights to use, copy, modify, merge, publish,      *
+ * distribute, distribute with modifications, sublicense, and/or sell       *
+ * copies of the Software, and to permit persons to whom the Software is    *
+ * furnished to do so, subject to the following conditions:                 *
+ *                                                                          *
+ * The above copyright notice and this permission notice shall be included  *
+ * in all copies or substantial portions of the Software.                   *
+ *                                                                          *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
+ * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
+ * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
+ *                                                                          *
+ * Except as contained in this notice, the name(s) of the above copyright   *
+ * holders shall not be used in advertising or otherwise to promote the     *
+ * sale, use or other dealings in this Software without prior written       *
+ * authorization.                                                           *
+ ****************************************************************************/
+/*
+ * $Id: dump_window.c,v 1.5 2023/11/11 00:30:50 tom Exp $
+ */
+#include <dump_window.h>
+
+static FILE *dumpfp;
+
+int
+open_dump(const char *fn)
+{
+    int result = 0;
+    close_dump();
+    if ((dumpfp = fopen(fn, "a")) != 0)
+	result = 1;
+    return result;
+}
+
+void
+close_dump(void)
+{
+    if (dumpfp != 0) {
+	fclose(dumpfp);
+	dumpfp = 0;
+    }
+}
+
+void
+dump_window(WINDOW *w)
+{
+    wgetch(w);
+    if (dumpfp != 0) {
+	int y, x;
+	int oldy, oldx;
+	int maxy, maxx;
+	int pass;
+	char *cvec = 0;
+	char *avec = 0;
+	char *pvec = 0;
+	int ccnt = 0;
+	int acnt = 0;
+	int pcnt = 0;
+	int endy = -1;
+	int endx = -1;
+
+	fprintf(dumpfp, "Window %p\n", (void *) w);
+
+	getyx(w, oldy, oldx);
+	getmaxyx(w, maxy, maxx);
+	fprintf(dumpfp, "size     (%dx%d)\n", maxy, maxx);
+	getbegyx(w, y, x);
+	fprintf(dumpfp, "begin    (%dx%d)\n", maxy, maxx);
+	getyx(w, y, x);
+	fprintf(dumpfp, "position (%d,%d)\n", y, x);
+
+	if (maxy > 0 && maxx > 0) {
+	    for (pass = 0; pass < 2; ++pass) {
+		for (y = 0; y < maxy; ++y) {
+
+		    if (cvec)
+			memset(cvec, 0, (size_t) maxx + 1);
+		    if (avec)
+			memset(avec, 0, (size_t) maxx + 1);
+		    if (pvec)
+			memset(pvec, 0, (size_t) maxx + 1);
+
+		    for (x = 0; x < maxx; ++x) {
+			chtype data = mvwinch(w, y, x);
+			chtype temp;
+			char cc = (char) ((data & 0xff) ? (data & 0xff) : ' ');
+			char aa;
+			char pp;
+
+			temp = ((data & A_ATTRIBUTES) & (chtype) (~A_COLOR));
+			if (temp) {
+			    if (temp & A_ALTCHARSET) {
+				aa = (temp & A_BOLD) ? 'A' : 'a';
+			    } else if (temp & A_STANDOUT) {
+				aa = (temp & A_BOLD) ? 'S' : 's';
+			    } else if (temp & A_REVERSE) {
+				aa = (temp & A_BOLD) ? 'R' : 'r';
+			    } else if (temp & A_UNDERLINE) {
+				aa = (temp & A_BOLD) ? 'U' : 'u';
+			    } else {
+				aa = (temp & A_BOLD) ? 'b' : '?';
+			    }
+			} else {
+			    aa = ' ';
+			}
+			if (data & A_COLOR) {
+			    if (PAIR_NUMBER((int) data) < 8) {
+				pp = (char) ('0' + PAIR_NUMBER((int) data));
+			    } else {
+				pp = '*';
+			    }
+			} else {
+			    pp = ' ';
+			}
+
+			if (pass) {
+			    if (cvec)
+				cvec[x] = cc;
+			    if (avec)
+				avec[x] = aa;
+			    if (pvec)
+				pvec[x] = pp;
+			} else {
+			    if (cc != ' ' || aa != ' ' || pp != ' ') {
+				if (endx < x)
+				    endx = x;
+				if (endy < y)
+				    endy = y;
+			    }
+			    ccnt += (cc != ' ');
+			    acnt += (aa != ' ');
+			    pcnt += (pp != ' ');
+			}
+		    }
+		    if (pass) {
+			fprintf(dumpfp, "%3d", y + 1);
+			if (cvec)
+			    fprintf(dumpfp, "\tc|%.*s|\n", maxx, cvec);
+			if (avec)
+			    fprintf(dumpfp, "\ta|%.*s|\n", maxx, avec);
+			if (pvec)
+			    fprintf(dumpfp, "\tp|%.*s|\n", maxx, pvec);
+		    }
+		}
+		if (pass) {
+		    free(cvec);
+		    free(avec);
+		    free(pvec);
+		} else {
+		    fprintf(dumpfp, "%d cells with characters\n", ccnt);
+		    fprintf(dumpfp, "%d cells with video-attributes\n", acnt);
+		    fprintf(dumpfp, "%d cells with color-attributes\n", pcnt);
+		    if (endy < 0 || endx < 0)
+			break;
+		    /* reduce the dump a little, ignore really blank cells */
+		    maxx = endx + 1;
+		    maxy = endy + 1;
+		    if (ccnt)
+			cvec = malloc((size_t) maxx + 1);
+		    if (acnt)
+			avec = malloc((size_t) maxx + 1);
+		    if (pcnt)
+			pvec = malloc((size_t) maxx + 1);
+		}
+	    }
+	}
+	wmove(w, oldy, oldx);
+    }
+}