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authorJeremy Kerr <jk@ozlabs.org>2013-12-10 14:12:48 +0800
committerJeremy Kerr <jk@ozlabs.org>2014-01-31 08:46:34 +0800
commit485680a5bfeb952fd652a59efcce35636d6aec00 (patch)
tree8f3f09ede88b8e60eb5a19a5a29de4e83451934e /lib
parent5a271400e9b5396cb90258b7582fe7ac6bcc2230 (diff)
downloadtalos-petitboot-485680a5bfeb952fd652a59efcce35636d6aec00.tar.gz
talos-petitboot-485680a5bfeb952fd652a59efcce35636d6aec00.zip
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>
Diffstat (limited to 'lib')
-rw-r--r--lib/Makefile.am2
-rw-r--r--lib/fold/fold.c44
-rw-r--r--lib/fold/fold.h27
3 files changed, 73 insertions, 0 deletions
diff --git a/lib/Makefile.am b/lib/Makefile.am
index 1c19e11..f6009cf 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -20,6 +20,8 @@ AM_CFLAGS = $(DEFAULT_CFLAGS)
noinst_LTLIBRARIES = libpbcore.la
libpbcore_la_SOURCES = \
+ fold/fold.h \
+ fold/fold.c \
log/log.h \
log/log.c \
list/list.c \
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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