Bug 43367 - RFE: iterator to peek objects in FcPattern

Add various APIs to obtain things in FcPattern through the iterator

https://bugs.freedesktop.org/show_bug.cgi?id=43367

doc/fcpattern.fncs

@@ -57,6 +57,15 @@ Decrement the pattern reference count. If all references are gone, destroys
 the pattern, in the process destroying all related values.
 @@
 
+@RET@		int
+@FUNC@		FcPatternObjectCount
+@TYPE1@		const FcPattern *		@ARG1@		p
+@PURPOSE@	Returns the number of the object
+@DESC@
+Returns the number of the object <parameter>p</parameter> has.
+@SINCE@		2.13.1
+@@
+
 @RET@		FcBool
 @FUNC@		FcPatternEqual
 @TYPE1@ 	const FcPattern *		@ARG1@ 		pa
@@ -383,7 +392,107 @@ whether the property existed or not.
 Removes the value associated with the property `object' at position `id', returning 
 whether the property existed and had a value at that position or not.
 @@
-		
+
+@RET@		void
+@FUNC@		FcPatternIterStart
+@TYPE1@		const FcPattern *		@ARG1@		p
+@TYPE2@		FcPatternIter *			@ARG2@		iter
+@PURPOSE@	Initialize the iterator with the first iterator in the pattern
+@DESC@
+Initialize <parameter>iter</parameter> with the first iterator in <parameter>p</parameter>.
+If there are no objects in <parameter>p</parameter>, <parameter>iter</parameter>
+will not have any valid data.
+@SINCE@		2.13.1
+@@
+
+@RET@		FcBool
+@FUNC@		FcPatternIterNext
+@TYPE1@		const FcPattern *		@ARG1@		p
+@TYPE2@		FcPatternIter *			@ARG2@		iter
+@PURPUSE@	Set the iterator to point to the next object in the pattern
+@DESC@
+Set <parameter>iter</parameter> to point to the next object in <parameter>p</parameter>
+and returns FcTrue if <parameter>iter</parameter> has been changed to the next object.
+returns FcFalse otherwise.
+@SINCE@		2.13.1
+@@
+
+@RET@		FcBool
+@FUNC@		FcPatternIterEqual
+@TYPE1@		const FcPattern *		@ARG1@		p1
+@TYPE2@		FcPatternIter *			@ARG2@		i1
+@TYPE3@		const FcPattern *		@ARG3@		p2
+@TYPE4@		FcPatternIter *			@ARG4@		i2
+@PURPOSE@	Compare iterators
+@DESC@
+Return FcTrue if both <parameter>i1</parameter> and <parameter>i2</parameter>
+point to same object and contains same values. return FcFalse otherwise.
+@SINCE@		2.13.1
+@@
+
+@RET@		FcBool
+@FUNC@		FcPatternFindIter
+@TYPE1@		const FcPattern *		@ARG1@		p
+@TYPE2@		FcPatternIter *			@ARG2@		iter
+@TYPE3@		const char *  			@ARG3@		object
+@PURPOSE@	Set the iterator to point to the object in the pattern
+@DESC@
+Set <parameter>iter</parameter> to point to <parameter>object</parameter> in
+<parameter>p</parameter> if any and returns FcTrue. returns FcFalse otherwise.
+@SINCE@		2.13.1
+@@
+
+@RET@		FcBool
+@FUNC@		FcPatternIterIsValid
+@TYPE1@		const FcPattern *		@ARG1@		p
+@TYPE2@		FcPatternIter :			@ARG2@		iter
+@PURPOSE@	Check whether the iterator is valid or not
+@DESC@
+Returns FcTrue if <parameter>iter</parameter> point to the valid entry
+in <parameter>p</parameter>. returns FcFalse otherwise.
+@SINCE@		2.13.1
+@@
+
+@RET@		const char *
+@FUNC@		FcPatternIterGetObject
+@TYPE1@		const FcPattern *		@ARG1@		p
+@TYPE2@		FcPatternIter *			@ARG2@		iter
+@PURPOSE@	Returns an object name which the iterator point to
+@DESC@
+Returns an object name in <parameter>p</parameter> which
+<parameter>iter</parameter> point to. returns NULL if
+<parameter>iter</parameter> isn't valid.
+@SINCE@		2.13.1
+@@
+
+@RET@		int
+@FUNC@		FcPatternIterValueCount
+@TYPE1@		const FcPattern *		@ARG1@		p
+@TYPE2@		FcPatternIter *			@ARG2@		iter
+@PURPOSE@	Returns the number of the values which the iterator point to
+@DESC@
+Returns the number of the values in the object which <parameter>iter</parameter>
+point to. if <parameter>iter</parameter> isn't valid, returns 0.
+@SINCE@		2.13.1
+@@
+
+@RET@		FcResult
+@FUNC@		FcPatternIterGetValue
+@TYPE1@		const FcPattern *		@ARG1@		p
+@TYPE2@		FcPatternIter *			@ARG2@		iter
+@TYPE3@		int	      			@ARG3@		id
+@TYPE4@		FcValue *			@ARG4@		v
+@TYPE5@		FcValueBinding *		@ARG5@		b
+@PURPOSE@	Returns a value which the iterator point to
+@DESC@
+Returns in <parameter>v</parameter> the <parameter>id</parameter>'th value
+which <parameter>iter</parameter> point to. also binding to <parameter>b</parameter>
+if given.
+The value returned is not a copy, but rather refers to the data stored
+within the pattern directly.  Applications must not free this value.
+@SINCE@		2.13.1
+@@
+
 @RET@		void
 @FUNC@		FcPatternPrint
 @TYPE1@		const FcPattern *		@ARG1@		p 

fontconfig/fontconfig.h

@@ -248,6 +248,11 @@ typedef enum _FcValueBinding {
 
 typedef struct _FcPattern   FcPattern;
 
+typedef struct _FcPatternIter {
+    void *dummy1;
+    void *dummy2;
+} FcPatternIter;
+
 typedef struct _FcLangSet   FcLangSet;
 
 typedef struct _FcRange	    FcRange;
@@ -861,6 +866,9 @@ FcValueSave (FcValue v);
 FcPublic void
 FcPatternDestroy (FcPattern *p);
 
+int
+FcPatternObjectCount (const FcPattern *pat);
+
 FcPublic FcBool
 FcPatternEqual (const FcPattern *pa, const FcPattern *pb);
 
@@ -961,6 +969,31 @@ FcRangeCopy (const FcRange *r);
 FcPublic FcBool
 FcRangeGetDouble(const FcRange *range, double *begin, double *end);
 
+FcPublic void
+FcPatternIterStart (const FcPattern *pat, FcPatternIter *iter);
+
+FcPublic FcBool
+FcPatternIterNext (const FcPattern *pat, FcPatternIter *iter);
+
+FcPublic FcBool
+FcPatternIterEqual (const FcPattern *p1, FcPatternIter *i1,
+		    const FcPattern *p2, FcPatternIter *i2);
+
+FcPublic FcBool
+FcPatternFindIter (const FcPattern *pat, FcPatternIter *iter, const char *object);
+
+FcPublic FcBool
+FcPatternIterIsValid (const FcPattern *pat, FcPatternIter *iter);
+
+FcPublic const char *
+FcPatternIterGetObject (const FcPattern *pat, FcPatternIter *iter);
+
+FcPublic int
+FcPatternIterValueCount (const FcPattern *pat, FcPatternIter *iter);
+
+FcPublic FcResult
+FcPatternIterGetValue (const FcPattern *pat, FcPatternIter *iter, int id, FcValue *v, FcValueBinding *b);
+
 /* fcweight.c */
 
 FcPublic int

src/fcdbg.c

@@ -187,22 +187,21 @@ FcCharSetPrint (const FcCharSet *c)
 void
 FcPatternPrint (const FcPattern *p)
 {
-    int		    i;
-    FcPatternElt   *e;
+    FcPatternIter iter;
 
     if (!p)
     {
 	printf ("Null pattern\n");
 	return;
     }
-    printf ("Pattern has %d elts (size %d)\n", p->num, p->size);
-    for (i = 0; i < p->num; i++)
+    printf ("Pattern has %d elts (size %d)\n", FcPatternObjectCount (p), p->size);
+    FcPatternIterStart (p, &iter);
+    do
     {
-	e = &FcPatternElts(p)[i];
-	printf ("\t%s:", FcObjectName(e->object));
-	FcValueListPrint (FcPatternEltValues(e));
+	printf ("\t%s:", FcPatternIterGetObject (p, &iter));
+	FcValueListPrint (FcPatternIterGetValues (p, &iter));
 	printf ("\n");
-    }
+    } while (FcPatternIterNext (p, &iter));
     printf ("\n");
 }
 

src/fcdefault.c

@@ -238,21 +238,22 @@ FcDefaultFini (void)
 void
 FcDefaultSubstitute (FcPattern *pattern)
 {
+    FcPatternIter iter;
     FcValue v, namelang, v2;
     int	    i;
     double	dpi, size, scale, pixelsize;
 
-    if (FcPatternObjectGet (pattern, FC_WEIGHT_OBJECT, 0, &v) == FcResultNoMatch )
+    if (!FcPatternFindObjectIter (pattern, &iter, FC_WEIGHT_OBJECT))
 	FcPatternObjectAddInteger (pattern, FC_WEIGHT_OBJECT, FC_WEIGHT_NORMAL);
 
-    if (FcPatternObjectGet (pattern, FC_SLANT_OBJECT, 0, &v) == FcResultNoMatch)
+    if (!FcPatternFindObjectIter (pattern, &iter, FC_SLANT_OBJECT))
 	FcPatternObjectAddInteger (pattern, FC_SLANT_OBJECT, FC_SLANT_ROMAN);
 
-    if (FcPatternObjectGet (pattern, FC_WIDTH_OBJECT, 0, &v) == FcResultNoMatch)
+    if (!FcPatternFindObjectIter (pattern, &iter, FC_WIDTH_OBJECT))
 	FcPatternObjectAddInteger (pattern, FC_WIDTH_OBJECT, FC_WIDTH_NORMAL);
 
     for (i = 0; i < NUM_FC_BOOL_DEFAULTS; i++)
-	if (FcPatternObjectGet (pattern, FcBoolDefaults[i].field, 0, &v) == FcResultNoMatch)
+	if (!FcPatternFindObjectIter (pattern, &iter, FcBoolDefaults[i].field))
 	    FcPatternObjectAddBool (pattern, FcBoolDefaults[i].field, FcBoolDefaults[i].value);
 
     if (FcPatternObjectGetDouble (pattern, FC_SIZE_OBJECT, 0, &size) != FcResultMatch)
@@ -269,7 +270,7 @@ FcDefaultSubstitute (FcPattern *pattern)
     if (FcPatternObjectGetDouble (pattern, FC_DPI_OBJECT, 0, &dpi) != FcResultMatch)
 	dpi = 75.0;
 
-    if (FcPatternObjectGet (pattern, FC_PIXEL_SIZE_OBJECT, 0, &v) != FcResultMatch)
+    if (!FcPatternFindObjectIter (pattern, &iter, FC_PIXEL_SIZE_OBJECT))
     {
 	(void) FcPatternObjectDel (pattern, FC_SCALE_OBJECT);
 	FcPatternObjectAddDouble (pattern, FC_SCALE_OBJECT, scale);
@@ -281,25 +282,22 @@ FcDefaultSubstitute (FcPattern *pattern)
     }
     else
     {
+	FcPatternIterGetValue(pattern, &iter, 0, &v, NULL);
 	size = v.u.d;
 	size = size / dpi * 72.0 / scale;
     }
     (void) FcPatternObjectDel (pattern, FC_SIZE_OBJECT);
     FcPatternObjectAddDouble (pattern, FC_SIZE_OBJECT, size);
 
-    if (FcPatternObjectGet (pattern, FC_FONTVERSION_OBJECT, 0, &v) == FcResultNoMatch)
-    {
+    if (!FcPatternFindObjectIter (pattern, &iter, FC_FONTVERSION_OBJECT))
 	FcPatternObjectAddInteger (pattern, FC_FONTVERSION_OBJECT, 0x7fffffff);
-    }
 
-    if (FcPatternObjectGet (pattern, FC_HINT_STYLE_OBJECT, 0, &v) == FcResultNoMatch)
-    {
+    if (!FcPatternFindObjectIter (pattern, &iter, FC_HINT_STYLE_OBJECT))
 	FcPatternObjectAddInteger (pattern, FC_HINT_STYLE_OBJECT, FC_HINT_FULL);
-    }
-    if (FcPatternObjectGet (pattern, FC_NAMELANG_OBJECT, 0, &v) == FcResultNoMatch)
-    {
+
+    if (!FcPatternFindObjectIter (pattern, &iter, FC_NAMELANG_OBJECT))
 	FcPatternObjectAddString (pattern, FC_NAMELANG_OBJECT, FcGetDefaultLang ());
-    }
+
     /* shouldn't be failed. */
     FcPatternObjectGet (pattern, FC_NAMELANG_OBJECT, 0, &namelang);
     /* Add a fallback to ensure the english name when the requested language
@@ -315,17 +313,17 @@ FcDefaultSubstitute (FcPattern *pattern)
      */
     v2.type = FcTypeString;
     v2.u.s = (FcChar8 *) "en-us";
-    if (FcPatternObjectGet (pattern, FC_FAMILYLANG_OBJECT, 0, &v) == FcResultNoMatch)
+    if (!FcPatternFindObjectIter (pattern, &iter, FC_FAMILYLANG_OBJECT))
     {
 	FcPatternObjectAdd (pattern, FC_FAMILYLANG_OBJECT, namelang, FcTrue);
 	FcPatternObjectAddWithBinding (pattern, FC_FAMILYLANG_OBJECT, v2, FcValueBindingWeak, FcTrue);
     }
-    if (FcPatternObjectGet (pattern, FC_STYLELANG_OBJECT, 0, &v) == FcResultNoMatch)
+    if (!FcPatternFindObjectIter (pattern, &iter, FC_STYLELANG_OBJECT))
     {
 	FcPatternObjectAdd (pattern, FC_STYLELANG_OBJECT, namelang, FcTrue);
 	FcPatternObjectAddWithBinding (pattern, FC_STYLELANG_OBJECT, v2, FcValueBindingWeak, FcTrue);
     }
-    if (FcPatternObjectGet (pattern, FC_FULLNAMELANG_OBJECT, 0, &v) == FcResultNoMatch)
+    if (!FcPatternFindObjectIter (pattern, &iter, FC_FULLNAMELANG_OBJECT))
     {
 	FcPatternObjectAdd (pattern, FC_FULLNAMELANG_OBJECT, namelang, FcTrue);
 	FcPatternObjectAddWithBinding (pattern, FC_FULLNAMELANG_OBJECT, v2, FcValueBindingWeak, FcTrue);

src/fcformat.c

@@ -544,7 +544,7 @@ interpret_count (FcFormatContext *c,
 		 FcStrBuf        *buf)
 {
     int count;
-    FcPatternElt *e;
+    FcPatternIter iter;
     FcChar8 buf_static[64];
 
     if (!expect_char (c, '#'))
@@ -554,16 +554,9 @@ interpret_count (FcFormatContext *c,
 	return FcFalse;
 
     count = 0;
-    e = FcPatternObjectFindElt (pat,
-				FcObjectFromName ((const char *) c->word));
-    if (e)
+    if (FcPatternFindIter (pat, &iter, (const char *) c->word))
     {
-	FcValueListPtr l;
-	count++;
-	for (l = FcPatternEltValues(e);
-	     l->next;
-	     l = l->next)
-	    count++;
+	count = FcPatternIterValueCount (pat, &iter);
     }
 
     snprintf ((char *) buf_static, sizeof (buf_static), "%d", count);
@@ -695,7 +688,7 @@ interpret_simple (FcFormatContext *c,
 		  FcPattern       *pat,
 		  FcStrBuf        *buf)
 {
-    FcPatternElt *e;
+    FcPatternIter iter;
     FcBool        add_colon = FcFalse;
     FcBool        add_elt_name = FcFalse;
     int           idx;
@@ -743,9 +736,7 @@ interpret_simple (FcFormatContext *c,
 	c->word = orig;
     }
 
-    e = FcPatternObjectFindElt (pat,
-				FcObjectFromName ((const char *) c->word));
-    if (e || else_string)
+    if (FcPatternFindIter (pat, &iter, (const char *) c->word) || else_string)
     {
 	FcValueListPtr l = NULL;
 
@@ -757,8 +748,7 @@ interpret_simple (FcFormatContext *c,
 	    FcStrBufChar (buf, '=');
 	}
 
-	if (e)
-	    l = FcPatternEltValues(e);
+	l = FcPatternIterGetValues (pat, &iter);
 
 	if (idx != -1)
 	{

src/fcint.h

@@ -1150,6 +1150,15 @@ FcPatternAppend (FcPattern *p, FcPattern *s);
 FcPrivate int
 FcPatternPosition (const FcPattern *p, const char *object);
 
+FcPrivate FcBool
+FcPatternFindObjectIter (const FcPattern *pat, FcPatternIter *iter, FcObject object);
+
+FcPrivate FcObject
+FcPatternIterGetObjectId (const FcPattern *pat, FcPatternIter *iter);
+
+FcPrivate FcValueListPtr
+FcPatternIterGetValues (const FcPattern *pat, FcPatternIter *iter);
+
 FcPrivate FcChar32
 FcStringHash (const FcChar8 *s);
 

src/fcpat.c

@@ -392,13 +392,23 @@ FcPatternDestroy (FcPattern *p)
 	return;
 
     elts = FcPatternElts (p);
-    for (i = 0; i < p->num; i++)
+    for (i = 0; i < FcPatternObjectCount (p); i++)
 	FcValueListDestroy (FcPatternEltValues(&elts[i]));
 
     free (elts);
     free (p);
 }
 
+int
+FcPatternObjectCount (const FcPattern *pat)
+{
+    if (pat)
+	return pat->num;
+
+    return 0;
+}
+
+
 static int
 FcPatternObjectPosition (const FcPattern *p, FcObject object)
 {
@@ -406,7 +416,7 @@ FcPatternObjectPosition (const FcPattern *p, FcObject object)
     FcPatternElt    *elts = FcPatternElts(p);
 
     low = 0;
-    high = p->num - 1;
+    high = FcPatternObjectCount (p) - 1;
     c = 1;
     mid = 0;
     while (low <= high)
@@ -452,7 +462,7 @@ FcPatternObjectInsertElt (FcPattern *p, FcObject object)
 	i = -i - 1;
 
 	/* reallocate array */
-	if (p->num + 1 >= p->size)
+	if (FcPatternObjectCount (p) + 1 >= p->size)
 	{
 	    int s = p->size + 16;
 	    if (p->size)
@@ -463,7 +473,7 @@ FcPatternObjectInsertElt (FcPattern *p, FcObject object)
 		{
 		    e = malloc(s * sizeof (FcPatternElt));
 		    if (e)
-			memcpy(e, e0, p->num * sizeof (FcPatternElt));
+			memcpy(e, e0, FcPatternObjectCount (p) * sizeof (FcPatternElt));
 		}
 	    }
 	    else
@@ -484,7 +494,7 @@ FcPatternObjectInsertElt (FcPattern *p, FcObject object)
 	memmove (e + i + 1,
 		 e + i,
 		 sizeof (FcPatternElt) *
-		 (p->num - i));
+		 (FcPatternObjectCount (p) - i));
 		
 	/* bump count */
 	p->num++;
@@ -499,24 +509,26 @@ FcPatternObjectInsertElt (FcPattern *p, FcObject object)
 FcBool
 FcPatternEqual (const FcPattern *pa, const FcPattern *pb)
 {
-    int	i;
-    FcPatternElt   *pae, *pbe;
+    FcPatternIter ia, ib;
 
     if (pa == pb)
 	return FcTrue;
 
-    if (pa->num != pb->num)
+    if (FcPatternObjectCount (pa) != FcPatternObjectCount (pb))
 	return FcFalse;
-    pae = FcPatternElts(pa);
-    pbe = FcPatternElts(pb);
-    for (i = 0; i < pa->num; i++)
-    {
-	if (pae[i].object != pbe[i].object)
-	    return FcFalse;
-	if (!FcValueListEqual (FcPatternEltValues(&pae[i]),
-			       FcPatternEltValues(&pbe[i])))
+    FcPatternIterStart (pa, &ia);
+    FcPatternIterStart (pb, &ib);
+    do {
+	FcBool ra, rb;
+
+	if (!FcPatternIterEqual (pa, &ia, pb, &ib))
 	    return FcFalse;
-    }
+	ra = FcPatternIterNext (pa, &ia);
+	rb = FcPatternIterNext (pb, &ib);
+	if (!ra && !rb)
+	    break;
+    } while (1);
+
     return FcTrue;
 }
 
@@ -527,7 +539,7 @@ FcPatternHash (const FcPattern *p)
     FcChar32	h = 0;
     FcPatternElt    *pe = FcPatternElts(p);
 
-    for (i = 0; i < p->num; i++)
+    for (i = 0; i < FcPatternObjectCount (p); i++)
     {
 	h = (((h << 1) | (h >> 31)) ^
 	     pe[i].object ^
@@ -713,10 +725,10 @@ FcPatternObjectDel (FcPattern *p, FcObject object)
 
     /* shuffle existing ones down */
     memmove (e, e+1,
-	     (FcPatternElts(p) + p->num - (e + 1)) *
+	     (FcPatternElts(p) + FcPatternObjectCount (p) - (e + 1)) *
 	     sizeof (FcPatternElt));
     p->num--;
-    e = FcPatternElts(p) + p->num;
+    e = FcPatternElts(p) + FcPatternObjectCount (p);
     e->object = 0;
     e->values = NULL;
     return FcTrue;
@@ -1115,8 +1127,7 @@ FcPattern *
 FcPatternDuplicate (const FcPattern *orig)
 {
     FcPattern	    *new;
-    FcPatternElt    *e;
-    int		    i;
+    FcPatternIter   iter;
     FcValueListPtr  l;
 
     if (!orig)
@@ -1126,20 +1137,18 @@ FcPatternDuplicate (const FcPattern *orig)
     if (!new)
 	goto bail0;
 
-    e = FcPatternElts(orig);
-
-    for (i = 0; i < orig->num; i++)
+    FcPatternIterStart (orig, &iter);
+    do
     {
-	for (l = FcPatternEltValues(e + i); l; l = FcValueListNext(l))
+	for (l = FcPatternIterGetValues (orig, &iter); l; l = FcValueListNext (l))
 	{
-	    if (!FcPatternObjectAddWithBinding (new, e[i].object,
+	    if (!FcPatternObjectAddWithBinding (new, FcPatternIterGetObjectId (orig, &iter),
 						FcValueCanonicalize(&l->value),
 						l->binding,
 						FcTrue))
 		goto bail1;
-	
 	}
-    }
+    } while (FcPatternIterNext (orig, &iter));
 
     return new;
 
@@ -1184,21 +1193,21 @@ FcPatternBuild (FcPattern *p, ...)
 FcBool
 FcPatternAppend (FcPattern *p, FcPattern *s)
 {
-    int		    i;
-    FcPatternElt    *e;
-    FcValueListPtr  v;
+    FcPatternIter  iter;
+    FcValueListPtr v;
 
-    for (i = 0; i < s->num; i++)
+    FcPatternIterStart (s, &iter);
+    do
     {
-	e = FcPatternElts(s)+i;
-	for (v = FcPatternEltValues(e); v; v = FcValueListNext(v))
+	for (v = FcPatternIterGetValues (s, &iter); v; v = FcValueListNext (v))
 	{
-	    if (!FcPatternObjectAddWithBinding (p, e->object,
+	    if (!FcPatternObjectAddWithBinding (p, FcPatternIterGetObjectId (s, &iter),
 						FcValueCanonicalize(&v->value),
 						v->binding, FcTrue))
 		return FcFalse;
 	}
-    }
+    } while (FcPatternIterNext (s, &iter));
+
     return FcTrue;
 }
 
@@ -1239,6 +1248,148 @@ bail0:
     return NULL;
 }
 
+typedef struct _FcPatternPrivateIter {
+    FcPatternElt *elt;
+    int           pos;
+} FcPatternPrivateIter;
+
+static void
+FcPatternIterSet (const FcPattern *pat, FcPatternPrivateIter *iter)
+{
+    iter->elt = FcPatternObjectCount (pat) > 0 && iter->pos < FcPatternObjectCount (pat) ? &FcPatternElts (pat)[iter->pos] : NULL;
+}
+
+void
+FcPatternIterStart (const FcPattern *pat, FcPatternIter *iter)
+{
+    FcPatternPrivateIter *priv = (FcPatternPrivateIter *) iter;
+
+    priv->pos = 0;
+    FcPatternIterSet (pat, priv);
+}
+
+FcBool
+FcPatternIterNext (const FcPattern *pat, FcPatternIter *iter)
+{
+    FcPatternPrivateIter *priv = (FcPatternPrivateIter *) iter;
+
+    priv->pos++;
+    if (priv->pos >= FcPatternObjectCount (pat))
+	return FcFalse;
+    FcPatternIterSet (pat, priv);
+
+    return FcTrue;
+}
+
+FcBool
+FcPatternIterEqual (const FcPattern *p1, FcPatternIter *i1,
+		    const FcPattern *p2, FcPatternIter *i2)
+{
+    FcBool b1 = FcPatternIterIsValid (p1, i1);
+    FcBool b2 = FcPatternIterIsValid (p2, i2);
+
+    if (!i1 && !i2)
+	return FcTrue;
+    if (!b1 || !b2)
+	return FcFalse;
+    if (FcPatternIterGetObjectId (p1, i1) != FcPatternIterGetObjectId (p2, i2))
+	return FcFalse;
+
+    return FcValueListEqual (FcPatternIterGetValues (p1, i1),
+			     FcPatternIterGetValues (p2, i2));
+}
+
+FcBool
+FcPatternFindObjectIter (const FcPattern *pat, FcPatternIter *iter, FcObject object)
+{
+    FcPatternPrivateIter *priv = (FcPatternPrivateIter *) iter;
+    int i = FcPatternObjectPosition (pat, object);
+
+    priv->elt = NULL;
+    if (i < 0)
+	return FcFalse;
+
+    priv->pos = i;
+    FcPatternIterSet (pat, priv);
+
+    return FcTrue;
+}
+
+FcBool
+FcPatternFindIter (const FcPattern *pat, FcPatternIter *iter, const char *object)
+{
+    return FcPatternFindObjectIter (pat, iter, FcObjectFromName (object));
+}
+
+FcBool
+FcPatternIterIsValid (const FcPattern *pat, FcPatternIter *iter)
+{
+    FcPatternPrivateIter *priv = (FcPatternPrivateIter *)iter;
+
+    if (priv && priv->elt)
+	return FcTrue;
+
+    return FcFalse;
+}
+
+FcObject
+FcPatternIterGetObjectId (const FcPattern *pat, FcPatternIter *iter)
+{
+    FcPatternPrivateIter *priv = (FcPatternPrivateIter *) iter;
+