update halloc, fix compile on gcc 5, avoid warning

Makefile

@@ -24,7 +24,7 @@ all: ${PROG}
 
 
 ${PROG}: ${SRC}
-	${CC} ${FLAGS} ${INCLUDEFLAGS} -o ${PROG} ${SRC} ${LINKFLAGS}
+	${CC} -std=c99 ${FLAGS} ${INCLUDEFLAGS} -o ${PROG} ${SRC} ${LINKFLAGS}
 
 clean:
 	-@rm -f ${PROG} *~ core *.core src/*.o src/halloc/src/*.o

src/halloc/align.h

@@ -15,6 +15,15 @@
 #ifndef _LIBP_ALIGN_H_
 #define _LIBP_ALIGN_H_
 
+#ifdef _MSC_VER
+
+/*
+ * MSVC defines max_align_t as a double.
+ */
+typedef double max_align_t;
+
+#else
+
 /*
  *	a type with the most strict alignment requirements
  */
@@ -34,3 +43,5 @@ typedef union max_align max_align_t;
 
 #endif
 
+#endif
+

src/halloc/halloc.c

@@ -46,7 +46,7 @@ realloc_t halloc_allocator = NULL;
 /*
  *	static methods
  */
-static void _set_allocator(void);
+int halloc_set_allocator(realloc_t realloc_func);
 static void * _realloc(void * ptr, size_t n);
 
 static int  _relate(hblock_t * b, hblock_t * p);
@@ -62,7 +62,10 @@ void * halloc(void * ptr, size_t len)
 	/* set up default allocator */
 	if (! allocator)
 	{
-		_set_allocator();
+		if (halloc_set_allocator(realloc) == 0)
+		{
+			halloc_set_allocator(_realloc);
+		}
 		assert(allocator);
 	}
 
@@ -172,7 +175,7 @@ char * h_strdup(const char * str)
 /*
  *	static stuff
  */
-static void _set_allocator(void)
+int halloc_set_allocator(realloc_t realloc_func)
 {
 	void * p;
 	assert(! allocator);
@@ -187,17 +190,17 @@ static void _set_allocator(void)
 	 *
 	 *	Thanks to Stan Tobias for pointing this tricky part out.
 	 */
-	allocator = realloc;
-	if (! (p = malloc(1)))
+	if (! (p = realloc_func(NULL, 1)))
 		/* hmm */
-		return;
+		return -1;
 		
-	if ((p = realloc(p, 0)))
+	if ((p = realloc_func(p, 0)))
 	{
-		/* realloc cannot be used as free() */
-		allocator = _realloc;
-		free(p);
+		/* realloc_func cannot be used as free() */
+		return 0;
 	}
+	allocator = realloc_func;
+	return 1;
 }
 
 static void * _realloc(void * ptr, size_t n)

src/halloc/macros.h

@@ -20,7 +20,7 @@
 /*
  	restore pointer to the structure by a pointer to its field
  */
-#define structof(p,t,f) ((t*)(- offsetof(t,f) + (char*)(p)))
+#define structof(p,t,f) ((t*)(- (ptrdiff_t) offsetof(t,f) + (char*)(p)))
 
 /*
  *	redefine for the target compiler

src/nestegg.c

@@ -985,7 +985,7 @@ static int
 ne_read_simple(nestegg * ctx, struct ebml_element_desc * desc, size_t length)
 {
   struct ebml_type * storage;
-  int r;
+  int r = 0;
 
   storage = (struct ebml_type *) (ctx->ancestor->data + desc->offset);