Index: aoc2024.c
==================================================================
--- aoc2024.c
+++ aoc2024.c
@@ -5,10 +5,15 @@
 #include <stdlib.h>
 #include <string.h>
 #include "aocdailies.h"
 #include "aocutils.h"
 
+void aoc202404(char *data, size_t len) {
+    (void)data; // unused argument
+    (void)len; // unused argument
+    printf("wip/n");
+}
 static size_t rcmap(unsigned size, unsigned row, unsigned col) {
     return row * (size + 1) + col;
 }
 
 static bool masat(char *data, unsigned size, unsigned row, unsigned col, int drow, int dcol) {

Index: aocdailies.c
==================================================================
--- aocdailies.c
+++ aocdailies.c
@@ -4,10 +4,11 @@
 aocfunc *aocselect(unsigned y, unsigned d) {
     aocfunc *p;
     switch (y * 100 + d) {
         default: p = NULL; break;
 
+        case 202405: p = aoc202405; break;
         case 202404: p = aoc202404; break;
         case 202403: p = aoc202403; break;
         case 202402: p = aoc202402; break;
         case 202401: p = aoc202401; break;
 

Index: aocdailies.h
==================================================================
--- aocdailies.h
+++ aocdailies.h
@@ -4,10 +4,11 @@
 #include <stddef.h>
 
 typedef void aocfunc(char *, size_t);
 aocfunc *aocselect(unsigned, unsigned);
 
+aocfunc aoc202405;
 aocfunc aoc202404;
 aocfunc aoc202403;
 aocfunc aoc202402;
 aocfunc aoc202401;
 

Index: aocutils.c
==================================================================
--- aocutils.c
+++ aocutils.c
@@ -7,11 +7,11 @@
     size_t na = 0, sa = 512;
     char *err;
     unsigned v;
     for (;;) {
         if (na == sa) {
-            // 13/8 is within 0.5% of the golden ratio
+            // grow the array (by golden ratio)
             unsigned *tmp = realloc(a, ((13*sa) / 8) * sizeof *tmp);
             if (!tmp) exit(EXIT_FAILURE);
             a = tmp;
             sa = (13*sa) / 8;
         }
@@ -39,12 +39,11 @@
     char *tmp = malloc(512);
     size_t s = 512;
     size_t r = 0;
     while ((ch = fgetc(h)) != EOF) {
         if (r == s) {
-            //grow tmp
-            // 13/8 is within 0.5% of the golden ratio
+            // grow the array (by golden ratio)
             char *ttmp = realloc(tmp, (13*s) / 8);
             if (ttmp) {
                 tmp = ttmp;
                 s = (13*s) / 8;
             } else {