[tracker] libtracker-sparql: Use existing escape_string() in Builder

[Martyn James Russell <mr src gnome org>]

commit ed36d2747692a6f2e437a91fb1d130ebbbf24375
Author: Martyn Russell <martyn lanedo com>
Date:   Sat Oct 19 15:13:33 2013 +0100

    libtracker-sparql: Use existing escape_string() in Builder
    
    the Builder's _object_string() had it's own duplicate version which was less
    comprehensive too.

 src/libtracker-sparql/tracker-builder.vala |   32 +---------------------------
 1 files changed, 1 insertions(+), 31 deletions(-)
---
diff --git a/src/libtracker-sparql/tracker-builder.vala b/src/libtracker-sparql/tracker-builder.vala
index 6d07d1e..37ed03d 100644
--- a/src/libtracker-sparql/tracker-builder.vala
+++ b/src/libtracker-sparql/tracker-builder.vala
@@ -509,37 +509,7 @@ public class Tracker.Sparql.Builder : Object {
                        states.length--;
                }
 
-               str.append (" \"");
-
-               char* p = literal;
-               while (*p != '\0') {
-                       size_t len = Posix.strcspn ((string) p, "\t\n\r\"\\");
-                       str.append_len ((string) p, (long) len);
-                       p += len;
-                       switch (*p) {
-                       case '\t':
-                               str.append ("\\t");
-                               break;
-                       case '\n':
-                               str.append ("\\n");
-                               break;
-                       case '\r':
-                               str.append ("\\r");
-                               break;
-                       case '"':
-                               str.append ("\\\"");
-                               break;
-                       case '\\':
-                               str.append ("\\\\");
-                               break;
-                       default:
-                               continue;
-                       }
-                       p++;
-               }
-
-               str.append ("\"");
-
+               str.append_printf (" \"%s\"", escape_string (literal));
                states += State.OBJECT;
 
                length++;