1 files changed, 138 insertions, 0 deletions

diff --git a/lib/libcurses/tscroll.c b/lib/libcurses/tscroll.c
new file mode 100644
index 000000000000..db7eda957569
--- /dev/null
+++ b/lib/libcurses/tscroll.c
@@ -0,0 +1,138 @@
+/*-
+ * Copyright (c) 1992, 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#)tscroll.c	8.2 (Berkeley) 4/15/94";
+#endif /* not lint */
+
+#include <curses.h>
+
+#define	MAXRETURNSIZE	64
+
+/*
+ * Routine to perform scrolling.  Derived from tgoto.c in tercamp(3)
+ * library.  Cap is a string containing printf type escapes to allow
+ * scrolling.  The following escapes are defined for substituting n:
+ *
+ *	%d	as in printf
+ *	%2	like %2d
+ *	%3	like %3d
+ *	%.	gives %c hacking special case characters
+ *	%+x	like %c but adding x first
+ *
+ *	The codes below affect the state but don't use up a value.
+ *
+ *	%>xy	if value > x add y
+ *	%i	increments n
+ *	%%	gives %
+ *	%B	BCD (2 decimal digits encoded in one byte)
+ *	%D	Delta Data (backwards bcd)
+ *
+ * all other characters are ``self-inserting''.
+ */
+char *
+__tscroll(cap, n)
+	const char *cap;
+	int n;
+{
+	static char result[MAXRETURNSIZE];
+	int c;
+	char *dp;
+
+	if (cap == NULL)
+		goto err;
+	for (dp = result; (c = *cap++) != '\0';) {
+		if (c != '%') {
+			*dp++ = c;
+			continue;
+		}
+		switch (c = *cap++) {
+		case 'n':
+			n ^= 0140;
+			continue;
+		case 'd':
+			if (n < 10)
+				goto one;
+			if (n < 100)
+				goto two;
+			/* FALLTHROUGH */
+		case '3':
+			*dp++ = (n / 100) | '0';
+			n %= 100;
+			/* FALLTHROUGH */
+		case '2':
+two:			*dp++ = n / 10 | '0';
+one:			*dp++ = n % 10 | '0';
+			continue;
+		case '>':
+			if (n > *cap++)
+				n += *cap++;
+			else
+				cap++;
+			continue;
+		case '+':
+			n += *cap++;
+			/* FALLTHROUGH */
+		case '.':
+			*dp++ = n;
+			continue;
+		case 'i':
+			n++;
+			continue;
+		case '%':
+			*dp++ = c;
+			continue;
+		case 'B':
+			n = (n / 10 << 4) + n % 10;
+			continue;
+		case 'D':
+			n = n - 2 * (n % 16);
+			continue;
+		/*
+		 * XXX
+		 * System V terminfo files have lots of extra gunk.
+		 * The only one we've seen in scrolling strings is
+		 * %pN, and it seems to work okay if we ignore it.
+		 */
+		case 'p':
+			++cap;
+			continue;
+		default:
+			goto err;
+		}
+	}
+	*dp = '\0';
+	return (result);
+
+err:	return("curses: __tscroll failed");
+}