diff --git a/test/test_sgr.c b/test/test_sgr.c
new file mode 100644
index 0000000..8763dca
--- /dev/null
+++ b/test/test_sgr.c
@@ -0,0 +1,392 @@
+/****************************************************************************
+ * Copyright 2019-2022,2023 Thomas E. Dickey                                *
+ * Copyright 2015-2016,2017 Free Software Foundation, Inc.                  *
+ *                                                                          *
+ * 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.                                                           *
+ ****************************************************************************/
+
+/*
+ * Author: Thomas E. Dickey
+ *
+ * $Id: test_sgr.c,v 1.22 2023/05/27 20:13:10 tom Exp $
+ *
+ * A simple demo of the sgr/sgr0 terminal capabilities.
+ */
+#define USE_TINFO
+#include <test.priv.h>
+
+#if !HAVE_TIGETSTR
+static GCC_NORETURN void failed(const char *);
+
+static void
+failed(const char *msg)
+{
+    fprintf(stderr, "%s\n", msg);
+    ExitProgram(EXIT_FAILURE);
+}
+#endif
+
+#if HAVE_TIGETSTR
+
+static bool no_init = FALSE;
+static bool q_opt = FALSE;
+
+static char *d_opt;
+static char *e_opt;
+static char **db_list;
+static int db_item;
+
+static long total_values;
+
+static char *
+make_dbitem(const char *const p, const char *const q)
+{
+    size_t need = strlen(e_opt) + 2 + (size_t) (p - q);
+    char *result = malloc(need);
+    _nc_SPRINTF(result, _nc_SLIMIT(need) "%s=%.*s", e_opt, (int) (p - q), q);
+    return result;
+}
+
+static void
+make_dblist(void)
+{
+    if (d_opt && e_opt) {
+	int pass;
+
+	for (pass = 0; pass < 2; ++pass) {
+	    char *p, *q;
+	    size_t count = 0;
+
+	    for (p = q = d_opt; *p != '\0'; ++p) {
+		if (*p == ':') {
+		    if (p != q + 1) {
+			if (pass) {
+			    db_list[count] = make_dbitem(p, q);
+			}
+			count++;
+		    }
+		    q = p + 1;
+		}
+	    }
+	    if (p != q + 1) {
+		if (pass) {
+		    db_list[count] = make_dbitem(p, q);
+		}
+		count++;
+	    }
+	    if (!pass) {
+		db_list = typeCalloc(char *, count + 1);
+	    }
+	}
+    }
+}
+
+static char *
+next_dbitem(void)
+{
+    char *result = 0;
+
+    if (db_list) {
+	if ((result = db_list[db_item]) == 0) {
+	    db_item = 0;
+	    result = db_list[0];
+	} else {
+	    db_item++;
+	}
+    }
+    printf("** %s\n", result ? result : "<null>");
+    return result;
+}
+
+#if NO_LEAKS
+static void
+free_dblist(void)
+{
+    if (db_list) {
+	int n;
+	for (n = 0; db_list[n]; ++n)
+	    free(db_list[n]);
+	free(db_list);
+	db_list = 0;
+    }
+}
+#endif
+
+#define MAXPAR    9
+#define MAXSGR    (1 << MAXPAR)
+#define BITS2P(n) (count & (1 << (n - 1)))
+#define MASK_SMSO (1 << 0)
+#define MASK_BOLD (1 << 5)
+#define MASK_REV  (1 << 2)
+
+static void
+dumpit(unsigned bits, unsigned ignore, const char *sgr, const char *sgr0)
+{
+    static const char sample[] = "abcdefghijklm";
+    static char params[] = "SURBDBIPA";
+    unsigned n;
+
+    printf("%4u ", bits);
+    bits &= ~ignore;
+    for (n = 0; n < MAXPAR; ++n) {
+	putchar((int) ((bits & (unsigned) (1 << n)) ? params[n] : '-'));
+    }
+    putchar(' ');
+    putp(sgr);
+    putp(sample);
+    putp(sgr0);
+    putchar('\n');
+}
+
+static bool
+one_bit(unsigned a, unsigned b)
+{
+    unsigned c = (a ^ b);
+    bool result = FALSE;
+    if (c) {
+	while (!(c & 1)) {
+	    c >>= 1;
+	}
+	result = (c == 1);
+    }
+    return result;
+}
+
+static void
+brute_force(const char *name)
+{
+    unsigned count;
+    char *my_sgr;
+    char *my_sgr0;
+    char *my_bold;
+    char *my_revs;
+    char *my_smso;
+    char *my_name = strdup(name);
+
+    if (db_list) {
+	putenv(next_dbitem());
+    }
+
+    if (!q_opt)
+	printf("Terminal type \"%s\"\n", my_name);
+
+    if (no_init) {
+	START_TRACE();
+    } else {
+	setupterm((NCURSES_CONST char *) my_name, 1, (int *) 0);
+    }
+
+    if (!q_opt) {
+	if (strcmp(my_name, ttytype))
+	    printf("... actual \"%s\"\n", ttytype);
+    }
+
+    my_sgr = tigetstr("sgr");
+    my_sgr0 = tigetstr("sgr0");
+    my_bold = tigetstr("bold");
+    my_revs = tigetstr("rev");
+    my_smso = tigetstr("smso");
+
+    if (!VALID_STRING(my_sgr)) {
+	fprintf(stderr, "no \"sgr\" capability found\n");
+    } else if (!VALID_STRING(my_sgr0)) {
+	fprintf(stderr, "no \"sgr0\" capability found\n");
+    } else {
+	char *values[MAXSGR + MAXPAR];
+	unsigned j;
+	unsigned ignore = 0;
+	unsigned reason = 0;
+	unsigned repeat = 0;
+	for (count = 0; count < MAXSGR; ++count) {
+	    values[count] = tparm(my_sgr,
+				  BITS2P(1),
+				  BITS2P(2),
+				  BITS2P(3),
+				  BITS2P(4),
+				  BITS2P(5),
+				  BITS2P(6),
+				  BITS2P(7),
+				  BITS2P(8),
+				  BITS2P(9));
+	    if (values[count] != 0) {
+		values[count] = strdup(values[count]);
+	    }
+	}
+	for (count = 0; count < MAXSGR; ++count) {
+	    if (values[count] != 0) {
+		for (j = count + 1; j < MAXSGR; ++j) {
+		    if (values[j] == 0)
+			continue;
+		    if (strcmp(values[count], values[j]))
+			continue;
+		    if (one_bit(count, j)) {
+			free(values[j]);
+			values[j] = 0;
+		    }
+		}
+	    }
+	}
+	for (j = 0; j < MAXPAR; ++j) {
+	    unsigned mask = (unsigned) (1 << j);
+	    for (count = 0; count < MAXSGR; ++count) {
+		if ((count & mask) != 0)
+		    continue;
+		if (values[count] != 0 && values[count + mask] != 0) {
+		    mask = 0;
+		    break;
+		}
+	    }
+	    ignore |= mask;
+	}
+	/* smso is tested first, but often duplicates bold or reverse. */
+	if (VALID_STRING(my_smso)) {
+	    if (VALID_STRING(my_bold) && !strcmp(my_bold, my_smso)) {
+		repeat |= MASK_SMSO;
+		reason = MASK_BOLD;
+	    }
+	    if (VALID_STRING(my_revs) && !strcmp(my_revs, my_smso)) {
+		repeat |= MASK_SMSO;
+		reason = MASK_REV;
+	    }
+	}
+	for (count = 0; count < MAXSGR; ++count) {
+	    if (values[count] != 0) {
+		bool found = FALSE;
+		if ((repeat & MASK_SMSO) != 0
+		    && (count & MASK_SMSO) != 0) {
+		    found = TRUE;
+		} else {
+		    for (j = 0; j < count; ++j) {
+			if (values[j] != 0 && !strcmp(values[j], values[count])) {
+			    if ((repeat & MASK_SMSO) != 0
+				&& (j & MASK_SMSO) != 0
+				&& (count & reason) != 0) {
+				continue;
+			    }
+			    found = TRUE;
+			    break;
+			}
+		    }
+		}
+		if (!found) {
+		    dumpit(count, ignore, values[count], my_sgr0);
+		    ++total_values;
+		}
+	    }
+	}
+	for (count = 0; count < MAXSGR; ++count) {
+	    free(values[count]);
+	}
+    }
+    free(my_name);
+    del_curterm(cur_term);
+}
+
+static void
+usage(int ok)
+{
+    static const char *msg[] =
+    {
+	"Usage: test_sgr [options] [terminal]"
+	,""
+	,"Print all distinct combinations of sgr capability."
+	,""
+	,USAGE_COMMON
+	,"Options:"
+	," -d LIST  colon-separated list of databases to use"
+	," -e NAME  environment variable to set with -d option"
+	," -n       do not initialize terminal, to test error-checking"
+	," -q       quiet (prints only counts)"
+    };
+    unsigned n;
+    for (n = 0; n < SIZEOF(msg); ++n) {
+	fprintf(stderr, "%s\n", msg[n]);
+    }
+    ExitProgram(ok ? EXIT_SUCCESS : EXIT_FAILURE);
+}
+/* *INDENT-OFF* */
+VERSION_COMMON()
+/* *INDENT-ON* */
+
+int
+main(int argc, char *argv[])
+{
+    int ch;
+    char *name;
+
+    while ((ch = getopt(argc, argv, OPTS_COMMON "d:e:nq")) != -1) {
+	switch (ch) {
+	case 'd':
+	    d_opt = optarg;
+	    break;
+	case 'e':
+	    e_opt = optarg;
+	    break;
+	case 'n':
+	    no_init = TRUE;
+	    break;
+	case 'q':
+	    q_opt = TRUE;
+	    break;
+	case OPTS_VERSION:
+	    show_version(argv);
+	    ExitProgram(EXIT_SUCCESS);
+	default:
+	    usage(ch == OPTS_USAGE);
+	    /* NOTREACHED */
+	}
+    }
+
+    make_dblist();
+
+    if (optind < argc) {
+	int n;
+	for (n = optind; n < argc; ++n) {
+	    brute_force(argv[n]);
+	}
+    } else if ((name = getenv("TERM")) != 0) {
+	brute_force(name);
+    } else {
+	static char dumb[] = "dumb";
+	brute_force(dumb);
+    }
+
+    printf("%ld distinct values\n", total_values);
+
+#if NO_LEAKS
+    free_dblist();
+#endif
+
+    ExitProgram(EXIT_SUCCESS);
+}
+
+#else /* !HAVE_TIGETSTR */
+int
+main(void)
+{
+    failed("This program requires the terminfo functions such as tigetstr");
+    ExitProgram(EXIT_FAILURE);
+}
+#endif /* HAVE_TIGETSTR */