Become a memory accounting amateur

userland/c/malloc.c

@@ -4,22 +4,26 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+/* We do this in a separate function just to illustrate that
+ * this is allows for malloc memory! This is unlike regular stack
+ * variables which may be deallocated when the function returns. */
+void *allocate_bytes(size_t nbytes) {
+    return malloc(nbytes);
+}
+
 int main(int argc, char **argv) {
     int *is;
     size_t nbytes, nints;
 
-    /* Decide how many ints to allocate. */
+    /* Decide how many ints to allocate.
+     * Unlike usual non-VLA arrays, the size is determined dynamically at runtime! */
     if (argc < 2) {
         nints = 2;
     } else {
         nints = strtoull(argv[1], NULL, 0);
     }
     nbytes = nints * sizeof(*is);
-
-    /* Allocate the ints.
-     * Note that unlike traditional stack arrays (non-VLA)
-     * this value does not have to be determined at compile time! */
-    is = malloc(nbytes);
+    is = allocate_bytes(nbytes);
 
     /* This can happen for example if we ask for too much memory. */
     if (is == NULL) {