added function abstractName from the API

src/runtime/c/text.cxx

@@ -17,3 +17,39 @@ int textcmp(PgfText &t1, PgfText &t2)
         i++;
     }
 }
+
+PGF_INTERNAL
+PgfText* textdup(PgfText *t1)
+{
+    PgfText *t2 = (PgfText *) malloc(sizeof(PgfText) + t1->size + 1);
+    t2->size = t1->size;
+    memcpy(t2->text, t1->text, t1->size+1);
+    return t2;
+}
+
+PGF_API uint32_t
+pgf_utf8_decode(const uint8_t** src_inout)
+{
+	const uint8_t* src = *src_inout;
+	uint8_t c = src[0];
+	if (c < 0x80) {
+		*src_inout = src + 1;
+		return c;
+	}
+	size_t len = (c < 0xe0 ? 1 :
+	              c < 0xf0 ? 2 :
+	              c < 0xf8 ? 3 :
+	              c < 0xfc ? 4 :
+	                         5
+	             );
+	uint64_t mask = 0x0103070F1f7f;
+	uint32_t u = c & (mask >> (len * 8));
+	for (size_t i = 1; i <= len; i++) {
+		c = src[i];
+		u = u << 6 | (c & 0x3f);
+	}
+	*src_inout = &src[len + 1];
+	return u;
+}
+
+