Use quotefmtinstall(); and %q when printing values in
ndb/query and ndb/ipquery.

Added quote parsing in libndb allowing strings quoted with " or ' and
embedded "" or '' inserts a single " or ' in the usual style; double quotes
don't feel like the plan9 way, but I kept support for backward compatability.

This useful for txt='' and hinfo='' strings.

-Steve

Reference: /n/sources/patch/maybe/ndb-quotefmt
Date: Fri Jan 22 13:35:32 CET 2010
Signed-off-by: steve@quintile.net

--- /sys/src/cmd/ndb/ipquery.c	Fri Jan 22 13:19:29 2010
+++ /sys/src/cmd/ndb/ipquery.c	Fri Jan 22 13:19:27 2010
@@ -22,7 +22,7 @@
 
 	tt = ndbipinfo(db, attr, val, rattr, nrattr);
 	for(t = tt; t; t = t->entry)
-		print("%s=%s ", t->attr, t->val);
+		print("%s=%q ", t->attr, t->val);
 	print("\n");
 	ndbfree(tt);
 }
@@ -42,6 +42,7 @@
 	if(argc < 3)
 		usage();
 
+	quotefmtinstall();
 	db = ndbopen(dbfile);
 	if(db == 0){
 		fprint(2, "no db files\n");
--- /sys/src/cmd/ndb/query.c	Fri Jan 22 13:19:33 2010
+++ /sys/src/cmd/ndb/query.c	Fri Jan 22 13:19:31 2010
@@ -58,7 +58,7 @@
 	/* all entries */
 	for(t = ndbsearch(db, &s, attr, val); t; t = ndbsnext(&s, attr, val)){
 		for(nt = t; nt; nt = nt->entry)
-			Bprint(&bout, "%s=%s ", nt->attr, nt->val);
+			Bprint(&bout, "%s=%q ", nt->attr, nt->val);
 		Bprint(&bout, "\n");
 		ndbfree(t);
 	}
@@ -99,6 +99,7 @@
 		usage();
 	}
 
+	quotefmtinstall();
 	if(Binit(&bout, 1, OWRITE) == -1)
 		sysfatal("Binit: %r");
 	db = ndbopen(dbfile);
--- /sys/src/libndb/ndbaux.c	Fri Jan 22 13:19:36 2010
+++ /sys/src/libndb/ndbaux.c	Fri Jan 22 13:19:34 2010
@@ -5,6 +5,31 @@
 #include <ndb.h>
 #include "ndbhf.h"
 
+/*
+ * strip quotes, deals with adjacent quotes
+ * implies a single quote.
+ * beware: modifies the source string
+ */
+static int
+unquote(char **buf)
+{
+	char q, *base, *w, *r;
+
+	base = *buf;
+	q = *base++;
+	r = w = base;
+	while(*r && *r != '\n'){
+		if(r[0] == q)
+			if(r[1] == q)
+				r++;
+			else
+				break;
+		*w++ = *r++;
+	}
+	*buf = r;
+	return w - base;
+}
+
 
 /*
  *  parse a single tuple
@@ -38,13 +63,9 @@
 	EATWHITE(cp);
 	if(*cp == '='){
 		cp++;
-		if(*cp == '"'){
-			p = ++cp;
-			while(*cp != '\n' && *cp != '"')
-				cp++;
-			len = cp - p;
-			if(*cp == '"')
-				cp++;
+		if(*cp == '"' || *cp == '\''){
+			p = cp+1;
+			len = unquote(&cp);
 		} else if(*cp == '#'){
 			len = 0;
 		} else {