first usable version of kernel and commands

After an year of hard work, this is a first "usable" version of Jehanne.

sys/src/lib/ndb/ndbparse.c

@@ -0,0 +1,67 @@
+/*
+ * This file is part of the UCB release of Plan 9. It is subject to the license
+ * terms in the LICENSE file found in the top-level directory of this
+ * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
+ * part of the UCB release of Plan 9, including this file, may be copied,
+ * modified, propagated, or distributed except according to the terms contained
+ * in the LICENSE file.
+ */
+
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <ctype.h>
+#include <ndb.h>
+#include "ndbhf.h"
+
+/*
+ *  Parse a data base entry.  Entries may span multiple
+ *  lines.  An entry starts on a left margin.  All subsequent
+ *  lines must be indented by white space.  An entry consists
+ *  of tuples of the forms:
+ *	attribute-name
+ *	attribute-name=value
+ *	attribute-name="value with white space"
+ *
+ *  The parsing returns a 2-dimensional structure.  The first
+ *  dimension joins all tuples. All tuples on the same line
+ *  form a ring along the second dimension.
+ */
+
+/*
+ *  parse the next entry in the file
+ */
+Ndbtuple*
+ndbparse(Ndb *db)
+{
+	char *line;
+	Ndbtuple *t;
+	Ndbtuple *first, *last;
+	int len;
+
+	first = last = 0;
+	for(;;){
+		if((line = Brdline(&db->b, '\n')) == 0)
+			break;
+		len = Blinelen(&db->b);
+		if(line[len-1] != '\n')
+			break;
+		if(first && !ISWHITE(*line) && *line != '#'){
+			Bseek(&db->b, -len, 1);
+			break;
+		}
+		t = _ndbparseline(line);
+		if(t == 0)
+			continue;
+		setmalloctag(t, getcallerpc());
+		if(first)
+			last->entry = t;
+		else
+			first = t;
+		last = t;
+		while(last->entry)
+			last = last->entry;
+	}
+	ndbsetmalloctag(first, getcallerpc());
+	return first;
+}