Use a unified bsearch (#1741)

A part of #593

src/hb-aat-layout.cc

@@ -139,7 +139,7 @@ hb_aat_layout_find_feature_mapping (hb_tag_t tag)
   return nullptr;
 #endif
 
-  return (const hb_aat_feature_mapping_t *) bsearch (&tag,
+  return (const hb_aat_feature_mapping_t *) hb_bsearch (&tag,
 							feature_mappings,
 							ARRAY_LENGTH (feature_mappings),
 							sizeof (feature_mappings[0]),

src/hb-algs.hh

@@ -603,40 +603,19 @@ hb_in_ranges (T u, T lo1, T hi1, T lo2, T hi2, T lo3, T hi3)
 /*
  * Sort and search.
  */
-
+template <typename ...Ts>
 static inline void *
 hb_bsearch (const void *key, const void *base,
 	    size_t nmemb, size_t size,
-	    int (*compar)(const void *_key, const void *_item))
+	    int (*compar)(const void *_key, const void *_item, Ts... args),
+	    Ts... args)
 {
   int min = 0, max = (int) nmemb - 1;
   while (min <= max)
   {
     int mid = (min + max) / 2;
     const void *p = (const void *) (((const char *) base) + (mid * size));
-    int c = compar (key, p);
+    int c = compar (key, p, args...);
-    if (c < 0)
-      max = mid - 1;
-    else if (c > 0)
-      min = mid + 1;
-    else
-      return (void *) p;
-  }
-  return nullptr;
-}
-
-static inline void *
-hb_bsearch_r (const void *key, const void *base,
-	      size_t nmemb, size_t size,
-	      int (*compar)(const void *_key, const void *_item, void *_arg),
-	      void *arg)
-{
-  int min = 0, max = (int) nmemb - 1;
-  while (min <= max)
-  {
-    int mid = ((unsigned int) min + (unsigned int) max) / 2;
-    const void *p = (const void *) (((const char *) base) + (mid * size));
-    int c = compar (key, p, arg);
     if (c < 0)
       max = mid - 1;
     else if (c > 0)

src/hb-ot-post-table.hh

@@ -168,7 +168,7 @@ struct post
       }
 
       hb_bytes_t st (name, len);
-      const uint16_t *gid = (const uint16_t *) hb_bsearch_r (hb_addressof (st), gids, count,
+      const uint16_t *gid = (const uint16_t *) hb_bsearch (hb_addressof (st), gids, count,
 							   sizeof (gids[0]), cmp_key, (void *) this);
       if (gid)
       {

src/hb-ot-var-mvar-table.hh

@@ -77,7 +77,7 @@ struct MVAR
 		 const int *coords, unsigned int coord_count) const
   {
     const VariationValueRecord *record;
-    record = (VariationValueRecord *) bsearch (&tag, valuesZ.arrayZ,
+    record = (VariationValueRecord *) hb_bsearch (&tag, valuesZ.arrayZ,
 						  valueRecordCount, valueRecordSize,
 						  tag_compare);
     if (!record)