new

src/libndb/ndblookval.c

@@ -0,0 +1,44 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <ip.h>
+#include <ndb.h>
+
+/*
+ *  Look for a pair with the given attribute.  look first on the same line,
+ *  then in the whole entry.
+ */
+Ndbtuple*
+ndbfindattr(Ndbtuple *entry, Ndbtuple *line, char *attr)
+{
+	Ndbtuple *nt;
+
+	/* first look on same line (closer binding) */
+	for(nt = line; nt;){
+		if(strcmp(attr, nt->attr) == 0)
+			return nt;
+		nt = nt->line;
+		if(nt == line)
+			break;
+	}
+
+	/* search whole tuple */
+	for(nt = entry; nt; nt = nt->entry)
+		if(strcmp(attr, nt->attr) == 0)
+			return nt;
+
+	return nil;
+}
+
+Ndbtuple*
+ndblookval(Ndbtuple *entry, Ndbtuple *line, char *attr, char *to)
+{
+	Ndbtuple *t;
+
+	t = ndbfindattr(entry, line, attr);
+	if(t != nil){
+		strncpy(to, t->val, Ndbvlen-1);
+		to[Ndbvlen-1] = 0;
+	}
+	return t;
+}