feat: (common) next_pow_of_two, min, max

lib/debug.c

@@ -96,7 +96,7 @@ debug_free (void *ptr, const char *file, size_t line)
  *          automatically inserts filename and line.
  */
 void *
-debug_malloc (size_t size, const char *file, size_t line)
+debug_smalloc (size_t size, const char *file, size_t line)
 {
     void *ptr;
 
@@ -117,13 +117,11 @@ debug_malloc (size_t size, const char *file, size_t line)
  *
  * @return  the pointer to the reallocated memory, or NULL in case of error
  *
- * @errno   see realloc(3)
- *
- * @usage   the header `debug.h` defines a macro `realloc(ptr, size)` that
+ * @usage   the header `debug.h` defines a macro `srealloc(ptr, size)` that
  *          automatically inserts filename and line.
  */
 void *
-debug_realloc (void *ptr, size_t size, const char *file, size_t line)
+debug_srealloc (void *ptr, size_t size, const char *file, size_t line)
 {
     void *new_ptr;
     uintptr_t old_ptr;

lib/inc/common.h

@@ -1,6 +1,20 @@
 #ifndef CUTILS_COMMON_H_
 #define CUTILS_COMMON_H_
 
+#include <stddef.h>
+#include <stdint.h>
+
+#define max(a, b) ((a) > (b) ? (a) : (b))
+#define min(a, b) ((a) < (b) ? (a) : (b))
+
+#if UINTPTR_MAX == 0xffffffffffffffff
+# define next_pow_of_two(n) (((size_t) 1) << (64 - __builtin_clzll (n)))
+#elif UINTPTR_MAX == 0xffffffff
+# define next_pow_of_two(n) (((size_t) 1) << (64 - __builtin_clz (n)))
+#else
+# error unsupported architecture: size_t expected to be 64-bit or 32-bit.
+#endif
+
 void *smalloc (size_t size);
 void *srealloc (void *ptr, size_t size);