diff -r 6456036bbb37 -r edb9f875b7f9 src/printf.c
--- a/src/printf.c	Wed Apr 03 21:22:23 2024 +0200
+++ b/src/printf.c	Fri Apr 12 21:48:12 2024 +0200
@@ -132,7 +132,7 @@
     return s;
 }
 
-int cx_sprintf_a(CxAllocator *alloc, char **str, size_t len, const char *fmt, ... ) {
+int cx_sprintf_a(CxAllocator *alloc, char **str, size_t *len, const char *fmt, ... ) {
     va_list ap;
     va_start(ap, fmt);
     int ret = cx_vsprintf_a(alloc, str, len, fmt, ap);
@@ -140,11 +140,11 @@
     return ret;
 }
 
-int cx_vsprintf_a(CxAllocator *alloc, char **str, size_t len, const char *fmt, va_list ap) {
+int cx_vsprintf_a(CxAllocator *alloc, char **str, size_t *len, const char *fmt, va_list ap) {
     va_list ap2;
     va_copy(ap2, ap);
-    int ret = vsnprintf(*str, len, fmt, ap);
-    if ((unsigned) ret >= len) {
+    int ret = vsnprintf(*str, *len, fmt, ap);
+    if ((unsigned) ret >= *len) {
         unsigned newlen = ret + 1;
         char *ptr = cxRealloc(alloc, *str, newlen);
         if (ptr) {
@@ -152,6 +152,7 @@
             if (newret < 0) {
                 cxFree(alloc, ptr);
             } else {
+                *len = newlen;
                 *str = ptr;
                 ret = newret;
             }
@@ -161,7 +162,7 @@
     return ret;
 }
 
-int cx_sprintf_sa(CxAllocator *alloc, char *buf, size_t len, char **str, const char *fmt, ... ) {
+int cx_sprintf_sa(CxAllocator *alloc, char *buf, size_t *len, char **str, const char *fmt, ... ) {
     va_list ap;
     va_start(ap, fmt);
     int ret = cx_vsprintf_sa(alloc, buf, len, str, fmt, ap);
@@ -169,12 +170,12 @@
     return ret;
 }
 
-int cx_vsprintf_sa(CxAllocator *alloc, char *buf, size_t len, char **str, const char *fmt, va_list ap) {
+int cx_vsprintf_sa(CxAllocator *alloc, char *buf, size_t *len, char **str, const char *fmt, va_list ap) {
     va_list ap2;
     va_copy(ap2, ap);
-    int ret = vsnprintf(buf, len, fmt, ap);
+    int ret = vsnprintf(buf, *len, fmt, ap);
     *str = buf;
-    if ((unsigned) ret >= len) {
+    if ((unsigned) ret >= *len) {
         unsigned newlen = ret + 1;
         char *ptr = cxMalloc(alloc, newlen);
         if (ptr) {
@@ -182,6 +183,7 @@
             if (newret < 0) {
                 cxFree(alloc, ptr);
             } else {
+                *len = newlen;
                 *str = ptr;
                 ret = newret;
             }