diff -r bc8b7c5f55fb -r cd418898af5c src/string.c
--- a/src/string.c	Thu Oct 31 14:39:05 2024 +0100
+++ b/src/string.c	Thu Oct 31 14:54:44 2024 +0100
@@ -27,7 +27,6 @@
  */
 
 #include "cx/string.h"
-#include "cx/utils.h"
 
 #include <string.h>
 #include <stdarg.h>
@@ -89,7 +88,7 @@
     va_list ap;
     va_start(ap, count);
     size_t size = 0;
-    cx_for_n(i, count) {
+    for (size_t i = 0; i < count; i++) {
         cxstring str = va_arg(ap, cxstring);
         size += str.length;
     }
@@ -114,7 +113,7 @@
 
     // get all args and overall length
     size_t slen = str.length;
-    cx_for_n(i, count) {
+    for (size_t i = 0; i < count; i++) {
         cxstring s = va_arg (ap, cxstring);
         strings[i] = s;
         slen += s.length;
@@ -132,7 +131,7 @@
     // concatenate strings
     size_t pos = str.length;
     str.length = slen;
-    cx_for_n(i, count) {
+    for (size_t i = 0; i < count; i++) {
         cxstring s = strings[i];
         memcpy(str.ptr + pos, s.ptr, s.length);
         pos += s.length;
@@ -193,7 +192,7 @@
 ) {
     chr = 0xFF & chr;
     // TODO: improve by comparing multiple bytes at once
-    cx_for_n(i, string.length) {
+    for (size_t i = 0; i < string.length; i++) {
         if (string.ptr[i] == chr) {
             return cx_strsubs(string, i);
         }
@@ -556,13 +555,13 @@
 }
 
 void cx_strlower(cxmutstr string) {
-    cx_for_n(i, string.length) {
+    for (size_t i = 0; i < string.length; i++) {
         string.ptr[i] = (char) tolower(string.ptr[i]);
     }
 }
 
 void cx_strupper(cxmutstr string) {
-    cx_for_n(i, string.length) {
+    for (size_t i = 0; i < string.length; i++) {
         string.ptr[i] = (char) toupper(string.ptr[i]);
     }
 }
@@ -748,7 +747,7 @@
 
     // if more delimiters are specified, check them now
     if (ctx->delim_more_count > 0) {
-        cx_for_n(i, ctx->delim_more_count) {
+        for (size_t i = 0; i < ctx->delim_more_count; i++) {
             cxstring d = cx_strstr(haystack, ctx->delim_more[i]);
             if (d.length > 0 && (delim.length == 0 || d.ptr < delim.ptr)) {
                 delim.ptr = d.ptr;