* malloc/malloc.c (bin_at): Rewrite to be more clear and to not

	waste bins[0..1].
	(malloc_state): Reduce bins size by 2.
	(_int_malloc): Fix test for large enough buffer for early termination.
	When no unsorted block matches perfectly and an exiting block has
	to be split, use full list insert and not shortcut which assumes
	the list is empty.

1 files changed, 14 insertions, 5 deletions

diff --git a/malloc/malloc.c b/malloc/malloc.c
index 6de1409..5813b41 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -2061,7 +2061,9 @@ nextchunk-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 typedef struct malloc_chunk* mbinptr;
 
 /* addressing -- note that bin_at(0) does not exist */
-#define bin_at(m, i) ((mbinptr)((char*)&((m)->bins[(i)<<1]) - (SIZE_SZ<<1)))
+#define bin_at(m, i) \
+  (mbinptr) (((char *) &((m)->bins[((i) - 1) * 2]))			      \
+	     - offsetof (struct malloc_chunk, fd))
 
 /* analog of ++bin */
 #define next_bin(b)  ((mbinptr)((char*)(b) + (sizeof(mchunkptr)<<1)))
@@ -2301,7 +2303,7 @@ struct malloc_state {
   mchunkptr        last_remainder;
 
   /* Normal bins packed as described above */
-  mchunkptr        bins[NBINS * 2];
+  mchunkptr        bins[NBINS * 2 - 2];
 
   /* Bitmap of bins */
   unsigned int     binmap[BINMAPSIZE];
@@ -4168,7 +4170,7 @@ _int_malloc(mstate av, size_t bytes)
       fwd->bk = victim;
       bck->fd = victim;
 
-      if (size >= nb)
+      if (size >= nb + MINSIZE)
 	any_larger = true;
 #define MAX_ITERS	10000
       if (++iters >= MAX_ITERS)
@@ -4291,8 +4293,15 @@ _int_malloc(mstate av, size_t bytes)
         else {
           remainder = chunk_at_offset(victim, nb);
 
-          unsorted_chunks(av)->bk = unsorted_chunks(av)->fd = remainder;
-          remainder->bk = remainder->fd = unsorted_chunks(av);
+	  /* We cannot assume the unsorted list is empty and therefore
+	     have to perform a complete insert here.  */
+	  bck = unsorted_chunks(av);
+	  fwd = bck->fd;
+	  remainder->bk = bck;
+	  remainder->fd = fwd;
+	  bck->fd = remainder;
+	  fwd->bk = remainder;
+
           /* advertise as last remainder */
           if (in_smallbin_range(nb))
             av->last_remainder = remainder;