From 485680a5bfeb952fd652a59efcce35636d6aec00 Mon Sep 17 00:00:00 2001
From: Jeremy Kerr <jk@ozlabs.org>
Date: Tue, 10 Dec 2013 14:12:48 +0800
Subject: lib/fold: Add text fold utility

We want to fold help text into the ncurses UI, so add a little module to
split text into lines.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
---
 lib/fold/fold.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 lib/fold/fold.h | 27 +++++++++++++++++++++++++++
 2 files changed, 71 insertions(+)
 create mode 100644 lib/fold/fold.c
 create mode 100644 lib/fold/fold.h

(limited to 'lib/fold')

diff --git a/lib/fold/fold.c b/lib/fold/fold.c
new file mode 100644
index 0000000..ec10c8c
--- /dev/null
+++ b/lib/fold/fold.c
@@ -0,0 +1,44 @@
+
+#include "fold/fold.h"
+
+void fold_text(const char *text,
+		int linelen,
+		int line_cb(void *arg, const char *start, int len),
+		void *arg)
+{
+	const char *start, *end, *sep;
+	int rc = 0;
+
+	start = end = sep = text;
+
+	while (!rc) {
+
+		if (*end == '\n') {
+			rc = line_cb(arg, start, end - start);
+			start = sep = ++end;
+
+		} else if (*end == '\0') {
+			line_cb(arg, start, end - start);
+			rc = 1;
+
+		} else if (end - start >= linelen - 1) {
+			if (sep != start) {
+				/* split on a previous word boundary, if
+				 * possible */
+				rc = line_cb(arg, start, sep - start);
+				start = end = ++sep;
+			} else {
+				/* otherwise, break the word */
+				end++;
+				rc = line_cb(arg, start, end - start);
+				start = sep = end;
+			}
+
+		} else {
+			end++;
+			/* record our last separator */
+			if (*end == ' ')
+				sep = end;
+		}
+	}
+}
diff --git a/lib/fold/fold.h b/lib/fold/fold.h
new file mode 100644
index 0000000..834fcf2
--- /dev/null
+++ b/lib/fold/fold.h
@@ -0,0 +1,27 @@
+/*
+ *  Copyright (C) 2013 IBM Corporation
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; version 2 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef FOLD_H
+#define FOLD_H
+
+void fold_text(const char *text,
+		int linelen,
+		int line_cb(void *arg, const char *start, int len),
+		void *arg);
+
+#endif /* FOLD_H */
+
-- 
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