Add dm_split_words() and dm_split_lvm_name() to libdevmapper.

diff --git a/lib/libdm-string.c b/lib/libdm-string.c
new file mode 100644 (file)
index 0000000..4ce6608
--- /dev/null
+++ b/lib/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;
+}