From 3e5e15a4923c752be703d7afb1214d5e5a767fad Mon Sep 17 00:00:00 2001
From: aura <nw@moneybot.cc>
Date: Wed, 25 Feb 2026 08:58:39 +0100
Subject: finish wall collisions (clipvelocity), some utils

---
 src/util/string.h | 30 ++++++++++++++++++++++++++++--
 1 file changed, 28 insertions(+), 2 deletions(-)

(limited to 'src/util/string.h')

diff --git a/src/util/string.h b/src/util/string.h
index b261e76..47da1a0 100644
--- a/src/util/string.h
+++ b/src/util/string.h
@@ -3,9 +3,15 @@
 
 #include "typedef.h"
 
+constexpr U32 strlen_ct( const char* str ) {
+  U32 len = 0;
+  for( ; !!str[len]; ++len );
+  return len;
+}
+
 template <U32 N>
 struct STR {
-  char data[N];
+  char data[N]{ 0 };
   enum {
     size = N
   };
@@ -13,11 +19,31 @@ struct STR {
     memset( data, 0, N );
   }
   STR( const char* str ) {
-    memcpy( data, str, N );
+    memcpy( data, str, strlen_ct( str ) );
   }
   STR( const STR<N>& str ) {
     memcpy( data, str.data, N );
   }
 
+  template <U32 other>
+  auto operator+( const STR<other>& rhs ) {
+    constexpr U32 l1 = strlen_ct( data );
+    constexpr U32 l2 = strlen_ct( rhs.data );
+
+    constexpr U32 high = N > other ? N : other;
+    constexpr U32 max = (l1 + l2 > high) ? l1 + l2 + 1 : high;
+
+    STR<max> result;
+    memcpy( result.data, data, l1 );
+    memcpy( result.data + l1, rhs.data, l2 );
+    result.data[l1 + l2] = '\0';
+    return result;
+  }
+
+  template <U32 other>
+  auto concat( const STR<other>& str ) {
+    return *this + str;
+  }
+
   operator char*() { return data; }
 };
-- 
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