initial import of NetBSD tree

1 files changed, 180 insertions, 0 deletions

diff --git a/usr.bin/vi/ex/ex_z.c b/usr.bin/vi/ex/ex_z.c
new file mode 100644
index 00000000000..d13064621b0
--- /dev/null
+++ b/usr.bin/vi/ex/ex_z.c
@@ -0,0 +1,180 @@
+/*-
+ * Copyright (c) 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[] = "@(#)ex_z.c	8.8 (Berkeley) 8/17/94";
+#endif /* not lint */
+
+#include <sys/types.h>
+#include <sys/queue.h>
+#include <sys/time.h>
+
+#include <bitstring.h>
+#include <limits.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <termios.h>
+
+#include "compat.h"
+#include <db.h>
+#include <regex.h>
+
+#include "vi.h"
+#include "excmd.h"
+
+/*
+ * ex_z -- :[line] z [^-.+=] [count] [flags]
+ *
+ *	Adjust window.
+ */
+int
+ex_z(sp, ep, cmdp)
+	SCR *sp;
+	EXF *ep;
+	EXCMDARG *cmdp;
+{
+	MARK abs;
+	recno_t cnt, equals, lno;
+	int eofcheck;
+
+	/*
+	 * !!!
+	 * If no count specified, use either two times the size of the
+	 * scrolling region, or the size of the window option.  POSIX
+	 * 1003.2 claims that the latter is correct, but historic ex/vi
+	 * documentation and practice appear to use the scrolling region.
+	 * I'm using the window size as it means that the entire screen
+	 * is used instead of losing a line to roundoff.  Note, we drop
+	 * a line from the cnt if using the window size to leave room for
+	 * the next ex prompt.
+	 */
+	if (F_ISSET(cmdp, E_COUNT))
+		cnt = cmdp->count;
+	else
+#ifdef HISTORIC_PRACTICE
+		cnt = O_VAL(sp, O_SCROLL) * 2;
+#else
+		cnt = O_VAL(sp, O_WINDOW) - 1;
+#endif
+
+	equals = 0;
+	eofcheck = 0;
+	lno = cmdp->addr1.lno;
+
+	switch (F_ISSET(cmdp,
+	    E_F_CARAT | E_F_DASH | E_F_DOT | E_F_EQUAL | E_F_PLUS)) {
+	case E_F_CARAT:		/* Display cnt * 2 before the line. */
+		eofcheck = 1;
+		if (lno > cnt * 2)
+			cmdp->addr1.lno = (lno - cnt * 2) + 1;
+		else
+			cmdp->addr1.lno = 1;
+		cmdp->addr2.lno = (cmdp->addr1.lno + cnt) - 1;
+		break;
+	case E_F_DASH:		/* Line goes at the bottom of the screen. */
+		cmdp->addr1.lno = lno > cnt ? (lno - cnt) + 1 : 1;
+		cmdp->addr2.lno = lno;
+		break;
+	case E_F_DOT:		/* Line goes in the middle of the screen. */
+		/*
+		 * !!!
+		 * Historically, the "middleness" of the line overrode the
+		 * count, so that "3z.19" or "3z.20" would display the first
+		 * 12 lines of the file, i.e. (N - 1) / 2 lines before and
+		 * after the specified line.
+		 */
+		eofcheck = 1;
+		cnt = (cnt - 1) / 2;
+		cmdp->addr1.lno = lno > cnt ? lno - cnt : 1;
+		cmdp->addr2.lno = lno + cnt;
+
+		/*
+		 * !!!
+		 * Historically, z. set the absolute cursor mark.
+		 */
+		abs.lno = sp->lno;
+		abs.cno = sp->cno;
+		(void)mark_set(sp, ep, ABSMARK1, &abs, 1);
+		break;
+	case E_F_EQUAL:		/* Center with hyphens. */
+		/*
+		 * !!!
+		 * Strangeness.  The '=' flag is like the '.' flag (see the
+		 * above comment, it applies here as well) but with a special
+		 * little hack.  Print out lines of hyphens before and after
+		 * the specified line.  Additionally, the cursor remains set
+		 * on that line.
+		 */
+		eofcheck = 1;
+		cnt = (cnt - 1) / 2;
+		cmdp->addr1.lno = lno > cnt ? lno - cnt : 1;
+		cmdp->addr2.lno = lno - 1;
+		if (ex_pr(sp, ep, cmdp))
+			return (1);
+		(void)ex_printf(EXCOOKIE,
+		    "%s", "----------------------------------------\n");
+		cmdp->addr2.lno = cmdp->addr1.lno = equals = lno;
+		if (ex_pr(sp, ep, cmdp))
+			return (1);
+		(void)ex_printf(EXCOOKIE,
+		    "%s", "----------------------------------------\n");
+		cmdp->addr1.lno = lno + 1;
+		cmdp->addr2.lno = (lno + cnt) - 1;
+		break;
+	default:
+		/* If no line specified, move to the next one. */
+		if (F_ISSET(cmdp, E_ADDRDEF))
+			++lno;
+		/* FALLTHROUGH */
+	case E_F_PLUS:		/* Line goes at the top of the screen. */
+		eofcheck = 1;
+		cmdp->addr1.lno = lno;
+		cmdp->addr2.lno = (lno + cnt) - 1;
+		break;
+	}
+
+	if (eofcheck) {
+		if (file_lline(sp, ep, &lno))
+			return (1);
+		if (cmdp->addr2.lno > lno)
+			cmdp->addr2.lno = lno;
+	}
+
+	if (ex_pr(sp, ep, cmdp))
+		return (1);
+	if (equals)
+		sp->lno = equals;
+	return (0);
+}