ccan: update ccan to fe99a8e0

diff --git a/ccan/README b/ccan/README
index 8d518c24..80a88ad4 100644
--- a/ccan/README
+++ b/ccan/README
@@ -1,3 +1,3 @@
 CCAN imported from https://github.com/rustyrussell/ccan.
 
-CCAN version: efd48386
+CCAN version: fe99a8e0
diff --git a/ccan/ccan/asort/asort.c b/ccan/ccan/asort/asort.c
index e7eaf2c2..b90891ea 100644
--- a/ccan/ccan/asort/asort.c
+++ b/ccan/ccan/asort/asort.c
@@ -5,9 +5,8 @@
 
 /* Steal glibc's code. */
 
-/* Copyright (C) 1991,1992,1996,1997,1999,2004 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2026 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
-   Written by Douglas C. Schmidt (schmidt@ics.uci.edu).
 
    The GNU C Library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
@@ -20,240 +19,437 @@
    Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, write to the Free
-   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-   02111-1307 USA.  */
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
 
 /* If you consider tuning this algorithm, you should consult first:
    Engineering a sort function; Jon Bentley and M. Douglas McIlroy;
    Software - Practice and Experience; Vol. 23 (11), 1249-1265, 1993.  */
 
+#include <assert.h>
+#include <errno.h>
 #include <limits.h>
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
+#include <stdbool.h>
 
-/* Byte-wise swap two items of size SIZE. */
-#define SWAP(a, b, size)						      \
-  do									      \
-    {									      \
-      register size_t __size = (size);					      \
-      register char *__a = (a), *__b = (b);				      \
-      do								      \
-	{								      \
-	  char __tmp = *__a;						      \
-	  *__a++ = *__b;						      \
-	  *__b++ = __tmp;						      \
-	} while (--__size > 0);						      \
-    } while (0)
-
-/* Discontinue quicksort algorithm when partition gets below this size.
-   This particular magic number was chosen to work best on a Sun 4/260. */
-#define MAX_THRESH 4
-
-/* Stack node declarations used to store unfulfilled partition obligations. */
-typedef struct
+/* glibc-internal type, mapped to ccan's equivalent. */
+typedef _total_order_cb __compar_d_fn_t;
+
+/* glibc-internal helpers, not available outside glibc. */
+static inline void *__mempcpy(void *dst, const void *src, size_t n)
+{
+  return (char *) memcpy (dst, src, n) + n;
+}
+
+/* glibc-internal helpers, not available outside glibc. */
+static inline void
+__memswap (void *__restrict p1, void *__restrict p2, size_t n)
+{
+  /* Use multiple small memcpys with constant size to enable inlining on most
+     targets.  */
+  enum { SWAP_GENERIC_SIZE = 32 };
+  unsigned char tmp[SWAP_GENERIC_SIZE];
+  while (n > SWAP_GENERIC_SIZE)
+    {
+      memcpy (tmp, p1, SWAP_GENERIC_SIZE);
+      p1 = __mempcpy (p1, p2, SWAP_GENERIC_SIZE);
+      p2 = __mempcpy (p2, tmp, SWAP_GENERIC_SIZE);
+      n -= SWAP_GENERIC_SIZE;
+    }
+  while (n > 0)
+    {
+      unsigned char t = ((unsigned char *)p1)[--n];
+      ((unsigned char *)p1)[n] = ((unsigned char *)p2)[n];
+      ((unsigned char *)p2)[n] = t;
+    }
+}
+
+/* Swap SIZE bytes between addresses A and B.  These helpers are provided
+   along the generic one as an optimization.  */
+
+enum swap_type_t
   {
-    char *lo;
-    char *hi;
-  } stack_node;
-
-/* The next 4 #defines implement a very fast in-line stack abstraction. */
-/* The stack needs log (total_elements) entries (we could even subtract
-   log(MAX_THRESH)).  Since total_elements has type size_t, we get as
-   upper bound for log (total_elements):
-   bits per byte (CHAR_BIT) * sizeof(size_t).  */
-#define STACK_SIZE	(CHAR_BIT * sizeof(size_t))
-#define PUSH(low, high)	((void) ((top->lo = (low)), (top->hi = (high)), ++top))
-#define	POP(low, high)	((void) (--top, (low = top->lo), (high = top->hi)))
-#define	STACK_NOT_EMPTY	(stack < top)
-
-
-/* Order size using quicksort.  This implementation incorporates
-   four optimizations discussed in Sedgewick:
-
-   1. Non-recursive, using an explicit stack of pointer that store the
-      next array partition to sort.  To save time, this maximum amount
-      of space required to store an array of SIZE_MAX is allocated on the
-      stack.  Assuming a 32-bit (64 bit) integer for size_t, this needs
-      only 32 * sizeof(stack_node) == 256 bytes (for 64 bit: 1024 bytes).
-      Pretty cheap, actually.
-
-   2. Chose the pivot element using a median-of-three decision tree.
-      This reduces the probability of selecting a bad pivot value and
-      eliminates certain extraneous comparisons.
-
-   3. Only quicksorts TOTAL_ELEMS / MAX_THRESH partitions, leaving
-      insertion sort to order the MAX_THRESH items within each partition.
-      This is a big win, since insertion sort is faster for small, mostly
-      sorted array segments.
-
-   4. The larger of the two sub-partitions is always pushed onto the
-      stack first, with the algorithm then concentrating on the
-      smaller partition.  This *guarantees* no more than log (total_elems)
-      stack size is needed (actually O(1) in this case)!  */
+    SWAP_WORDS_64,
+    SWAP_WORDS_32,
+    SWAP_VOID_ARG,
+    SWAP_BYTES
+  };
 
-void
-_asort (void *const pbase, size_t total_elems, size_t size,
-	int(*cmp)(const void *, const void *, void *arg),
-	void *arg)
+typedef uint32_t __attribute__ ((__may_alias__)) u32_alias_t;
+typedef uint64_t __attribute__ ((__may_alias__)) u64_alias_t;
+
+static inline void
+swap_words_64 (void * restrict a, void * restrict b, size_t n)
+{
+  assert(n && n % 8 == 0);
+  do
+   {
+     n -= 8;
+     u64_alias_t t = *(u64_alias_t *)(a + n);
+     *(u64_alias_t *)(a + n) = *(u64_alias_t *)(b + n);
+     *(u64_alias_t *)(b + n) = t;
+   } while (n);
+}
+
+static inline void
+swap_words_32 (void * restrict a, void * restrict b, size_t n)
+{
+  assert(n && n % 4 == 0);
+  do
+   {
+     n -= 4;
+     u32_alias_t t = *(u32_alias_t *)(a + n);
+     *(u32_alias_t *)(a + n) = *(u32_alias_t *)(b + n);
+     *(u32_alias_t *)(b + n) = t;
+   } while (n);
+}
+
+/* Replace the indirect call with a serie of if statements.  It should help
+   the branch predictor.  */
+static void
+do_swap (void * restrict a, void * restrict b, size_t size,
+	 enum swap_type_t swap_type)
+{
+  if (swap_type == SWAP_WORDS_64)
+    swap_words_64 (a, b, size);
+  else if (swap_type == SWAP_WORDS_32)
+    swap_words_32 (a, b, size);
+  else
+    __memswap (a, b, size);
+}
+
+/* Establish the heap condition at index K, that is, the key at K will
+   not be less than either of its children, at 2 * K + 1 and 2 * K + 2
+   (if they exist).  N is the last valid index. */
+static inline void
+siftdown (void *base, size_t size, size_t k, size_t n,
+	  enum swap_type_t swap_type, __compar_d_fn_t cmp, void *arg)
+{
+  /* There can only be a heap condition violation if there are
+     children.  */
+  while (2 * k + 1 <= n)
+    {
+      /* Left child.  */
+      size_t j = 2 * k + 1;
+      /* If the right child is larger, use it.  */
+      if (j < n && cmp (base + (j * size), base + ((j + 1) * size), arg) < 0)
+	j++;
+
+      /* If k is already >= to its children, we are done.  */
+      if (j == k || cmp (base + (k * size), base + (j * size), arg) >= 0)
+	break;
+
+      /* Heal the violation.  */
+      do_swap (base + (size * j), base + (k * size), size, swap_type);
+
+      /* Swapping with j may have introduced a violation at j.  Fix
+	 it in the next loop iteration.  */
+      k = j;
+    }
+}
+
+/* Establish the heap condition for the indices 0 to N (inclusive).  */
+static inline void
+heapify (void *base, size_t size, size_t n, enum swap_type_t swap_type,
+	 __compar_d_fn_t cmp, void *arg)
 {
-  register char *base_ptr = (char *) pbase;
+  /* If n is odd, k = n / 2 has a left child at n, so this is the
+     largest index that can have a heap condition violation regarding
+     its children.  */
+  size_t k = n / 2;
+  while (1)
+    {
+      siftdown (base, size, k, n, swap_type, cmp, arg);
+      if (k-- == 0)
+	break;
+    }
+}
+
+static enum swap_type_t
+get_swap_type (void *const pbase, size_t size)
+{
+  if ((size & (sizeof (uint32_t) - 1)) == 0
+      && ((uintptr_t) pbase) % __alignof__ (uint32_t) == 0)
+    {
+      if (size == sizeof (uint32_t))
+	return SWAP_WORDS_32;
+      else if (size == sizeof (uint64_t)
+	       && ((uintptr_t) pbase) % __alignof__ (uint64_t) == 0)
+	return SWAP_WORDS_64;
+    }
+  return SWAP_BYTES;
+}
+
 
-  const size_t max_thresh = MAX_THRESH * size;
+/* A non-recursive heapsort with worst-case performance of O(nlog n) and
+   worst-case space complexity of O(1).  It sorts the array starting at
+   BASE with n + 1 elements of SIZE bytes.  The SWAP_TYPE is the callback
+   function used to swap elements, and CMP is the function used to compare
+   elements.  */
+static void
+heapsort_r (void *base, size_t n, size_t size, __compar_d_fn_t cmp, void *arg)
+{
+  if (n == 0)
+    return;
+
+  enum swap_type_t swap_type = get_swap_type (base, size);
+
+  /* Build the binary heap, largest value at the base[0].  */
+  heapify (base, size, n, swap_type, cmp, arg);
+
+  while (true)
+    {
+      /* Indices 0 .. n contain the binary heap.  Extract the largest
+	 element put it into the final position in the array.  */
+      do_swap (base, base + (n * size), size, swap_type);
+
+      /* The heap is now one element shorter.  */
+      n--;
+      if (n == 0)
+	break;
+
+      /* By swapping in elements 0 and the previous value of n (now at
+	 n + 1), we likely introduced a heap condition violation.  Fix
+	 it for the reduced heap.  */
+      siftdown (base, size, 0, n, swap_type, cmp, arg);
+    }
+}
+
+/* The maximum size in bytes required by mergesort that will be provided
+   through a buffer allocated in the stack.  */
+#define QSORT_STACK_SIZE  1024
+
+/* Elements larger than this value will be sorted through indirect sorting
+   to minimize the need to memory swap calls.  */
+#define INDIRECT_SORT_SIZE_THRES  32
+
+struct msort_param
+{
+  size_t s;
+  enum swap_type_t var;
+  __compar_d_fn_t cmp;
+  void *arg;
+  char *t;
+};
+
+static void
+msort_with_tmp (const struct msort_param *p, void *b, size_t n)
+{
+  char *b1, *b2;
+  size_t n1, n2;
 
-  if (total_elems == 0)
-    /* Avoid lossage with unsigned arithmetic below.  */
+  if (n <= 1)
     return;
 
-  if (total_elems > MAX_THRESH)
+  n1 = n / 2;
+  n2 = n - n1;
+  b1 = b;
+  b2 = (char *) b + (n1 * p->s);
+
+  msort_with_tmp (p, b1, n1);
+  msort_with_tmp (p, b2, n2);
+
+  char *tmp = p->t;
+  const size_t s = p->s;
+  __compar_d_fn_t cmp = p->cmp;
+  void *arg = p->arg;
+  switch (p->var)
     {
-      char *lo = base_ptr;
-      char *hi = &lo[size * (total_elems - 1)];
-      stack_node stack[STACK_SIZE];
-      stack_node *top = stack;
-
-      PUSH (NULL, NULL);
-
-      while (STACK_NOT_EMPTY)
-        {
-          char *left_ptr;
-          char *right_ptr;
-
-	  /* Select median value from among LO, MID, and HI. Rearrange
-	     LO and HI so the three values are sorted. This lowers the
-	     probability of picking a pathological pivot value and
-	     skips a comparison for both the LEFT_PTR and RIGHT_PTR in
-	     the while loops. */
-
-	  char *mid = lo + size * ((hi - lo) / size >> 1);
-
-	  if ((*cmp) ((void *) mid, (void *) lo, arg) < 0)
-	    SWAP (mid, lo, size);
-	  if ((*cmp) ((void *) hi, (void *) mid, arg) < 0)
-	    SWAP (mid, hi, size);
+    case SWAP_WORDS_32:
+      while (n1 > 0 && n2 > 0)
+	{
+	  if (cmp (b1, b2, arg) <= 0)
+	    {
+	      *(u32_alias_t *) tmp = *(u32_alias_t *) b1;
+	      b1 += sizeof (u32_alias_t);
+	      --n1;
+	    }
 	  else
-	    goto jump_over;
-	  if ((*cmp) ((void *) mid, (void *) lo, arg) < 0)
-	    SWAP (mid, lo, size);
-	jump_over:;
-
-	  left_ptr  = lo + size;
-	  right_ptr = hi - size;
-
-	  /* Here's the famous ``collapse the walls'' section of quicksort.
-	     Gotta like those tight inner loops!  They are the main reason
-	     that this algorithm runs much faster than others. */
-	  do
 	    {
-	      while ((*cmp) ((void *) left_ptr, (void *) mid, arg) < 0)
-		left_ptr += size;
-
-	      while ((*cmp) ((void *) mid, (void *) right_ptr, arg) < 0)
-		right_ptr -= size;
-
-	      if (left_ptr < right_ptr)
-		{
-		  SWAP (left_ptr, right_ptr, size);
-		  if (mid == left_ptr)
-		    mid = right_ptr;
-		  else if (mid == right_ptr)
-		    mid = left_ptr;
-		  left_ptr += size;
-		  right_ptr -= size;
-		}
-	      else if (left_ptr == right_ptr)
-		{
-		  left_ptr += size;
-		  right_ptr -= size;
-		  break;
-		}
+	      *(u32_alias_t *) tmp = *(u32_alias_t *) b2;
+	      b2 += sizeof (u32_alias_t);
+	      --n2;
+	    }
+	  tmp += sizeof (u32_alias_t);
+	}
+      break;
+    case SWAP_WORDS_64:
+      while (n1 > 0 && n2 > 0)
+	{
+	  if (cmp (b1, b2, arg) <= 0)
+	    {
+	      *(u64_alias_t *) tmp = *(u64_alias_t *) b1;
+	      b1 += sizeof (u64_alias_t);
+	      --n1;
 	    }
-	  while (left_ptr <= right_ptr);
-
-          /* Set up pointers for next iteration.  First determine whether
-             left and right partitions are below the threshold size.  If so,
-             ignore one or both.  Otherwise, push the larger partition's
-             bounds on the stack and continue sorting the smaller one. */
-
-          if ((size_t) (right_ptr - lo) <= max_thresh)
-            {
-              if ((size_t) (hi - left_ptr) <= max_thresh)
-		/* Ignore both small partitions. */
-                POP (lo, hi);
-              else
-		/* Ignore small left partition. */
-                lo = left_ptr;
-            }
-          else if ((size_t) (hi - left_ptr) <= max_thresh)
-	    /* Ignore small right partition. */
-            hi = right_ptr;
-          else if ((right_ptr - lo) > (hi - left_ptr))
-            {
-	      /* Push larger left partition indices. */
-              PUSH (lo, right_ptr);
-              lo = left_ptr;
-            }
-          else
-            {
-	      /* Push larger right partition indices. */
-              PUSH (left_ptr, hi);
-              hi = right_ptr;
-            }
-        }
+	  else
+	    {
+	      *(u64_alias_t *) tmp = *(u64_alias_t *) b2;
+	      b2 += sizeof (u64_alias_t);
+	      --n2;
+	    }
+	  tmp += sizeof (u64_alias_t);
+	}
+      break;
+    case SWAP_VOID_ARG:
+      while (n1 > 0 && n2 > 0)
+	{
+	  if ((*cmp) (*(const void **) b1, *(const void **) b2, arg) <= 0)
+	    {
+	      *(void **) tmp = *(void **) b1;
+	      b1 += sizeof (void *);
+	      --n1;
+	    }
+	  else
+	    {
+	      *(void **) tmp = *(void **) b2;
+	      b2 += sizeof (void *);
+	      --n2;
+	    }
+	  tmp += sizeof (void *);
+	}
+      break;
+    default:
+      while (n1 > 0 && n2 > 0)
+	{
+	  if (cmp (b1, b2, arg) <= 0)
+	    {
+	      tmp = (char *) __mempcpy (tmp, b1, s);
+	      b1 += s;
+	      --n1;
+	    }
+	  else
+	    {
+	      tmp = (char *) __mempcpy (tmp, b2, s);
+	      b2 += s;
+	      --n2;
+	    }
+	}
+      break;
     }
 
-  /* Once the BASE_PTR array is partially sorted by quicksort the rest
-     is completely sorted using insertion sort, since this is efficient
-     for partitions below MAX_THRESH size. BASE_PTR points to the beginning
-     of the array to sort, and END_PTR points at the very last element in
-     the array (*not* one beyond it!). */
+  if (n1 > 0)
+    memcpy (tmp, b1, n1 * s);
+  memcpy (b, p->t, (n - n2) * s);
+}
 
-#define min(x, y) ((x) < (y) ? (x) : (y))
+static void
+indirect_msort_with_tmp (const struct msort_param *p, void *b, size_t n,
+			 size_t s)
+{
+  /* Indirect sorting.  */
+  char *ip = (char *) b;
+  void **tp = (void **) (p->t + n * sizeof (void *));
+  void **t = tp;
+  void *tmp_storage = (void *) (tp + n);
 
-  {
-    char *const end_ptr = &base_ptr[size * (total_elems - 1)];
-    char *tmp_ptr = base_ptr;
-    char *thresh = min(end_ptr, base_ptr + max_thresh);
-    register char *run_ptr;
+  while ((void *) t < tmp_storage)
+    {
+      *t++ = ip;
+      ip += s;
+    }
+  msort_with_tmp (p, p->t + n * sizeof (void *), n);
+
+  /* tp[0] .. tp[n - 1] is now sorted, copy around entries of
+     the original array.  Knuth vol. 3 (2nd ed.) exercise 5.2-10.  */
+  char *kp;
+  size_t i;
+  for (i = 0, ip = (char *) b; i < n; i++, ip += s)
+    if ((kp = tp[i]) != ip)
+      {
+	size_t j = i;
+	char *jp = ip;
+	memcpy (tmp_storage, ip, s);
+
+	do
+	  {
+	    size_t k = (kp - (char *) b) / s;
+	    tp[j] = jp;
+	    memcpy (jp, kp, s);
+	    j = k;
+	    jp = kp;
+	    kp = tp[k];
+	  }
+	while (kp != ip);
+
+	tp[j] = jp;
+	memcpy (jp, tmp_storage, s);
+      }
+}
 
-    /* Find smallest element in first threshold and place it at the
-       array's beginning.  This is the smallest array element,
-       and the operation speeds up insertion sort's inner loop. */
+static void
+qsort_r_mergesort (void *const pbase, size_t total_elems, size_t size,
+		   __compar_d_fn_t cmp, void *arg, void *buf)
+{
+  if (size > INDIRECT_SORT_SIZE_THRES)
+    {
+      const struct msort_param msort_param =
+	{
+	  .s = sizeof (void *),
+	  .cmp = cmp,
+	  .arg = arg,
+	  .var = SWAP_VOID_ARG,
+	  .t = buf,
+	};
+      indirect_msort_with_tmp (&msort_param, pbase, total_elems, size);
+    }
+  else
+    {
+      const struct msort_param msort_param =
+	{
+	  .s = size,
+	  .cmp = cmp,
+	  .arg = arg,
+	  .var = get_swap_type (pbase, size),
+	  .t = buf,
+	};
+      msort_with_tmp (&msort_param, pbase, total_elems);
+    }
+}
 
-    for (run_ptr = tmp_ptr + size; run_ptr <= thresh; run_ptr += size)
-      if ((*cmp) ((void *) run_ptr, (void *) tmp_ptr, arg) < 0)
-        tmp_ptr = run_ptr;
+static bool
+qsort_r_malloc (void *const pbase, size_t total_elems, size_t size,
+		__compar_d_fn_t cmp, void *arg, size_t total_size)
+{
+  int save = errno;
+  char *buf = malloc (total_size);
+  errno = save;
+  if (buf == NULL)
+    return false;
 
-    if (tmp_ptr != base_ptr)
-      SWAP (tmp_ptr, base_ptr, size);
+  qsort_r_mergesort (pbase, total_elems, size, cmp, arg, buf);
 
-    /* Insertion sort, running from left-hand-side up to right-hand-side.  */
+  free (buf);
 
-    run_ptr = base_ptr + size;
-    while ((run_ptr += size) <= end_ptr)
-      {
-	tmp_ptr = run_ptr - size;
-	while ((*cmp) ((void *) run_ptr, (void *) tmp_ptr, arg) < 0)
-	  tmp_ptr -= size;
-
-	tmp_ptr += size;
-        if (tmp_ptr != run_ptr)
-          {
-            char *trav;
-
-	    trav = run_ptr + size;
-	    while (--trav >= run_ptr)
-              {
-                char c = *trav;
-                char *hi, *lo;
-
-                for (hi = lo = trav; (lo -= size) >= tmp_ptr; hi = lo)
-                  *hi = *lo;
-                *hi = c;
-              }
-          }
-      }
-  }
+  return true;
+}
+
+void
+_asort (void *const pbase, size_t total_elems, size_t size,
+	_total_order_cb cmp, void *arg)
+{
+  if (total_elems <= 1)
+    return;
+
+  /* Align to the maximum size used by the swap optimization.  */
+  size_t total_size = total_elems * size;
+
+  if (size > INDIRECT_SORT_SIZE_THRES)
+    total_size = 2 * total_elems * sizeof (void *) + size;
+
+  if (total_size <= QSORT_STACK_SIZE)
+    {
+      _Alignas (uint64_t) char tmp[QSORT_STACK_SIZE];
+      qsort_r_mergesort (pbase, total_elems, size, cmp, arg, tmp);
+    }
+  else
+    {
+      if (!qsort_r_malloc (pbase, total_elems, size, cmp, arg, total_size))
+	/* Fallback to heapsort in case of memory failure.  */
+	heapsort_r (pbase, total_elems - 1, size, cmp, arg);
+    }
 }
 
 #endif /* !HAVE_QSORT_R_PRIVATE_LAST */
diff --git a/ccan/ccan/asort/test/run.c b/ccan/ccan/asort/test/run.c
index e07fe283..9d4559c5 100644
--- a/ccan/ccan/asort/test/run.c
+++ b/ccan/ccan/asort/test/run.c
@@ -43,6 +43,20 @@ static void pseudo_random_array(int arr[], unsigned int size)
 		arr[i] = i * (INT_MAX / 4 - 7);
 }
 
+/* Track whether the comparator was ever called with identical pointers. */
+static bool self_compared;
+
+static int test_cmp_self(const int *a, const int *b, void *unused)
+{
+	if (a == b)
+		self_compared = true;
+	if (*a < *b)
+		return -1;
+	if (*a > *b)
+		return 1;
+	return 0;
+}
+
 #define TEST_SIZE 100
 
 int main(void)
@@ -50,7 +64,7 @@ int main(void)
 	int tmparr[TEST_SIZE];
 	int multiplier = 1;
 
-	plan_tests(4);
+	plan_tests(8);
 
 	pseudo_random_array(tmparr, TEST_SIZE);
 	ok1(!is_sorted(tmparr, TEST_SIZE));
@@ -64,5 +78,31 @@ int main(void)
 	asort(tmparr, TEST_SIZE, test_cmp, &multiplier);
 	ok1(is_reverse_sorted(tmparr, TEST_SIZE));
 
+	/* Sorting an array with all equal elements must not crash and must
+	 * produce a sorted result regardless of whether the comparator
+	 * receives identical pointers (self-comparisons are permitted by
+	 * the C standard and done by some qsort implementations). */
+	for (int i = 0; i < TEST_SIZE; i++)
+		tmparr[i] = 42;
+	self_compared = false;
+	asort(tmparr, TEST_SIZE, test_cmp_self, NULL);
+	ok1(is_sorted(tmparr, TEST_SIZE));
+
+	/* Sorting a single element must not crash. */
+	tmparr[0] = 7;
+	asort(tmparr, 1, test_cmp_self, NULL);
+	ok1(tmparr[0] == 7);
+
+	/* Force a self-comparison directly to verify the comparator handles it. */
+	{
+		int val = 42;
+		self_compared = false;
+		ok1(test_cmp_self(&val, &val, NULL) == 0);
+		ok1(self_compared);
+	}
+
+	diag("asort comparator called with identical pointers: %s",
+	     self_compared ? "yes" : "no");
+
 	return exit_status();
 }
diff --git a/ccan/ccan/base64/base64.c b/ccan/ccan/base64/base64.c
index 89e0d38b..212e9b55 100644
--- a/ccan/ccan/base64/base64.c
+++ b/ccan/ccan/base64/base64.c
@@ -212,42 +212,38 @@ ssize_t base64_decode_using_maps(const base64_maps_t *maps,
 const base64_maps_t base64_maps_rfc4648 = {
   "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
 
-  "\xff\xff\xff\xff\xff" /* 0 */					\
-  "\xff\xff\xff\xff\xff" /* 5 */					\
-  "\xff\xff\xff\xff\xff" /* 10 */					\
-  "\xff\xff\xff\xff\xff" /* 15 */					\
-  "\xff\xff\xff\xff\xff" /* 20 */					\
-  "\xff\xff\xff\xff\xff" /* 25 */					\
-  "\xff\xff\xff\xff\xff" /* 30 */					\
-  "\xff\xff\xff\xff\xff" /* 35 */					\
-  "\xff\xff\xff\x3e\xff" /* 40 */					\
-  "\xff\xff\x3f\x34\x35" /* 45 */					\
-  "\x36\x37\x38\x39\x3a" /* 50 */					\
-  "\x3b\x3c\x3d\xff\xff" /* 55 */					\
-  "\xff\xff\xff\xff\xff" /* 60 */					\
-  "\x00\x01\x02\x03\x04" /* 65 A */					\
-  "\x05\x06\x07\x08\x09" /* 70 */					\
-  "\x0a\x0b\x0c\x0d\x0e" /* 75 */					\
-  "\x0f\x10\x11\x12\x13" /* 80 */					\
-  "\x14\x15\x16\x17\x18" /* 85 */					\
-  "\x19\xff\xff\xff\xff" /* 90 */					\
-  "\xff\xff\x1a\x1b\x1c" /* 95 */					\
-  "\x1d\x1e\x1f\x20\x21" /* 100 */					\
-  "\x22\x23\x24\x25\x26" /* 105 */					\
-  "\x27\x28\x29\x2a\x2b" /* 110 */					\
-  "\x2c\x2d\x2e\x2f\x30" /* 115 */					\
-  "\x31\x32\x33\xff\xff" /* 120 */					\
-  "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" /* 125 */			\
-  "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"				\
-  "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"				\
-  "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" /* 155 */			\
-  "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"				\
-  "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"				\
-  "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" /* 185 */			\
-  "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"				\
-  "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"				\
-  "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" /* 215 */			\
-  "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"				\
-  "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"				\
-  "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff" /* 245 */
+  /*   0 */ "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"		\
+  /*  10 */ "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"		\
+  /*  20 */ "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"		\
+  /*  30 */ "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"		\
+  /*  40 */ "\xff\xff\xff\x3e\xff"				\
+  /*  45 */ "\xff\xff\x3f\x34\x35"				\
+  /*  50 */ "\x36\x37\x38\x39\x3a"				\
+  /*  55 */ "\x3b\x3c\x3d\xff\xff"				\
+  /*  60 */ "\xff\xff\xff\xff\xff"				\
+  /*  65 */ "\x00\x01\x02\x03\x04" /* A */			\
+  /*  70 */ "\x05\x06\x07\x08\x09"				\
+  /*  75 */ "\x0a\x0b\x0c\x0d\x0e"				\
+  /*  80 */ "\x0f\x10\x11\x12\x13"				\
+  /*  85 */ "\x14\x15\x16\x17\x18"				\
+  /*  90 */ "\x19\xff\xff\xff\xff"				\
+  /*  95 */ "\xff\xff\x1a\x1b\x1c"				\
+  /* 100 */ "\x1d\x1e\x1f\x20\x21"				\
+  /* 105 */ "\x22\x23\x24\x25\x26"				\
+  /* 110 */ "\x27\x28\x29\x2a\x2b"				\
+  /* 115 */ "\x2c\x2d\x2e\x2f\x30"				\
+  /* 120 */ "\x31\x32\x33\xff\xff"				\
+  /* 125 */ "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"		\
+  /* 135 */ "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"		\
+  /* 145 */ "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"		\
+  /* 155 */ "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"		\
+  /* 165 */ "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"		\
+  /* 175 */ "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"		\
+  /* 185 */ "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"		\
+  /* 195 */ "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"		\
+  /* 205 */ "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"		\
+  /* 215 */ "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"		\
+  /* 225 */ "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"		\
+  /* 235 */ "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"		\
+  /* 245 */ "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
 };