Add dm_split_words() and dm_split_lvm_name() to libdevmapper.

1 files changed, 101 insertions, 0 deletions

diff --git a/libdm/libdm-string.c b/libdm/libdm-string.c
new file mode 100644
index 000000000..4ce660807
--- /dev/null
+++ b/libdm/libdm-string.c
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
+ *
+ * This file is part of the device-mapper userspace tools.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License v.2.
+ *
+ * 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
+ */
+
+#include "lib.h"
+#include "libdevmapper.h"
+
+#include <ctype.h>
+
+/*
+ * consume characters while they match the predicate function.
+ */
+static char *_consume(char *buffer, int (*fn) (int))
+{
+	while (*buffer && fn(*buffer))
+		buffer++;
+
+	return buffer;
+}
+
+static int _isword(int c)
+{
+	return !isspace(c);
+}
+
+/*
+ * Split buffer into NULL-separated words in argv.
+ * Returns number of words.
+ */
+int dm_split_words(char *buffer, unsigned max, unsigned ignore_comments,
+		   char **argv)
+{
+	unsigned arg;
+
+	for (arg = 0; arg < max; arg++) {
+		buffer = _consume(buffer, isspace);
+		if (!*buffer)
+			break;
+
+		argv[arg] = buffer;
+		buffer = _consume(buffer, _isword);
+
+		if (*buffer) {
+			*buffer = '\0';
+			buffer++;
+		}
+	}
+
+	return arg;
+}
+
+/*
+ * Remove hyphen quoting from a component of a name.
+ * NULL-terminates the component and returns start of next component.
+ */
+static char *_unquote(char *component)
+{
+	char *c = component;
+	char *o = c;
+	char *r;
+
+	while (*c) {
+		if (*(c + 1)) {
+			if (*c == '-') {
+				if (*(c + 1) == '-')
+					c++;
+				else
+					break;
+			}
+		}
+		*o = *c;
+		o++;
+		c++;
+	}
+
+	r = (*c) ? c + 1 : c;
+	*o = '\0';
+
+	return r;
+}
+
+int dm_split_lvm_name(struct dm_pool *mem, const char *dmname,
+		      char **vgname, char **lvname, char **layer)
+{
+	if (!(*vgname = dm_pool_strdup(mem, dmname)))
+		return 0;
+
+	_unquote(*layer = _unquote(*lvname = _unquote(*vgname)));
+
+	return 1;
+}