Add test with the regexp implementation in Go.

function.go

@@ -46,6 +46,12 @@ static int my_value_numeric_type(sqlite3_value** argv, int i) {
 	return sqlite3_value_numeric_type(argv[i]);
 }
 
+extern void goXAuxDataDestroy(void *ad);
+
+static void goSqlite3SetAuxdata(sqlite3_context* ctx, int N, void* ad) {
+	sqlite3_set_auxdata(ctx, N, ad, goXAuxDataDestroy);
+}
+
 extern void goXFunc(sqlite3_context* ctx, int argc, sqlite3_value** argv);
 extern void goXDestroy(void *pApp);
 
@@ -71,6 +77,14 @@ type Context struct {
 	argv    **C.sqlite3_value
 }
 
+func (c *Context) ResultBool(b bool) {
+	if b {
+		c.ResultInt(1)
+	} else {
+		c.ResultInt(0)
+	}
+}
+
 // Set the result of an SQL function
 // Calls sqlite3_result_blob, http://sqlite.org/c3ref/result_blob.html
 func (c *Context) ResultBlob(b []byte) {
@@ -162,15 +176,33 @@ func (c *Context) UserData() interface{} {
 // Function auxiliary data
 // Calls sqlite3_get_auxdata, http://sqlite.org/c3ref/get_auxdata.html
 func (c *Context) GetAuxData(n int) interface{} {
-	return C.sqlite3_get_auxdata(c.context, C.int(n))
+	adp := (*sqliteAuxData)(C.sqlite3_get_auxdata(c.context, C.int(n)))
+	if adp == nil {
+		return nil
+	}
+	return adp.ad
 }
 
 type AuxDataDestructor func(ad interface{})
+type sqliteAuxData struct {
+	ad interface{}
+	d  AuxDataDestructor
+}
+
+//export goXAuxDataDestroy
+func goXAuxDataDestroy(ad unsafe.Pointer) {
+	adp := (*sqliteAuxData)(ad)
+	if adp != nil && adp.d != nil {
+		adp.d(adp.ad)
+	}
+}
 
 // Function auxiliary data
 // Calls sqlite3_set_auxdata, http://sqlite.org/c3ref/get_auxdata.html
-func (c *Context) SetAuxData(n int, ad interface{}, f AuxDataDestructor) {
-	// FIXME C.sqlite3_set_auxdata(c.context, C.int(n), unsafe.Pointer(ad), nil /*void (*)(void*)*/ )
+func (c *Context) SetAuxData(n int, ad interface{}, d AuxDataDestructor) {
+	// How to make sure it is not gced?
+	adp := &sqliteAuxData{ad, d}
+	C.goSqlite3SetAuxdata(c.context, C.int(n), unsafe.Pointer(adp))
 }
 
 // The leftmost value is number 0.

function_test.go

@@ -2,11 +2,17 @@ package sqlite_test
 
 import (
 	. "github.com/gwenn/gosqlite"
+	"regexp"
 	"testing"
 )
 
 func half(ctx *Context, nArg int) {
+	nt := ctx.NumericType(0)
+	if nt == Integer || nt == Float {
 		ctx.ResultDouble(ctx.Double(0) / 2)
+	} else {
+		ctx.ResultNull()
+	}
 }
 
 func TestScalarFunction(t *testing.T) {
@@ -46,3 +52,75 @@ func TestScalarFunction(t *testing.T) {
 		t.Errorf("couldn't destroy function: %s", err)
 	}
 }
+
+func re(ctx *Context, nArg int) {
+	ad := ctx.GetAuxData(0)
+	var re *regexp.Regexp
+	if ad == nil {
+		//println("Compile")
+		var err error
+		re, err = regexp.Compile(ctx.Text(0))
+		if err != nil {
+			ctx.ResultError(err.Error())
+			return
+		}
+		ctx.SetAuxData(0, re, nil)
+	} else {
+		//println("Reuse")
+		var ok bool
+		if re, ok = ad.(*regexp.Regexp); !ok {
+			ctx.ResultError("AuxData not a regexp ")
+			return
+		}
+	}
+	m := re.MatchString(ctx.Text(1))
+	ctx.ResultBool(m)
+}
+
+func TestRegexpFunction(t *testing.T) {
+	db, err := Open("")
+	if err != nil {
+		t.Fatalf("couldn't open database file: %s", err)
+	}
+	defer db.Close()
+	err = db.CreateScalarFunction("regexp", 2, nil, re, nil)
+	if err != nil {
+		t.Fatalf("couldn't create function: %s", err)
+	}
+	s, err := db.Prepare("select regexp('l.s[aeiouy]', name) from (select 'lisa' as name union all select 'bart' as name)")
+	if err != nil {
+		t.Fatalf("couldn't prepare statement: %s", err)
+	}
+	b, err := s.Next()
+	if err != nil {
+		t.Fatalf("couldn't step statement: %s", err)
+	}
+	if !b {
+		t.Fatalf("No result")
+	}
+	i, _, err := s.ScanInt(0)
+	if err != nil {
+		t.Fatalf("couldn't scan result: %s", err)
+	}
+	if i != 1 {
+		t.Errorf("Expected %d but got %d", 1, i)
+	}
+	b, err = s.Next()
+	if err != nil {
+		t.Fatalf("couldn't step statement: %s", err)
+	}
+	if !b {
+		t.Fatalf("No result")
+	}
+	i, _, err = s.ScanInt(0)
+	if err != nil {
+		t.Fatalf("couldn't scan result: %s", err)
+	}
+	if i != 0 {
+		t.Errorf("Expected %d but got %d", 0, i)
+	}
+	err = s.Finalize()
+	if err != nil {
+		t.Fatalf("couldn't finalize statement: %s", err)
+	}
+}