diff --git a/bantam.hpp b/bantam.hpp
index 5cf672e..30952a1 100644
--- a/bantam.hpp
+++ b/bantam.hpp
@@ -20,6 +20,7 @@
 #define BANTAM_HPP
 
 #include <cstdarg>
+#include <cstdio>
 #include <cstddef>
 #include <cstdint>
 #include <map>
@@ -171,8 +172,26 @@ std::string_view utf8_truncate(std::string_view s, size_t max_bytes);
 
 std::string filter_text(std::string_view s);
 int color_enabled(const Cfg &cfg);
-std::string cstr(std::string_view text, std::span<const int> codes);
-void cprint(std::string_view text, std::span<const int> codes);
+template<class R>
+inline std::string cstr(std::string_view text, const R& codes) {
+  if (!g_col || codes.empty() || text.empty()) return std::string(text);
+  std::string s;
+  s.reserve(text.size() + 16);
+  s += "\033[";
+  for (size_t i = 0; i < codes.size(); i++) {
+    if (i) s += ';';
+    s += sfmt("%d", (int)codes[i]);
+  }
+  s += "m";
+  s += text;
+  s += "\033[0m";
+  return s;
+}
+template<class R>
+inline void cprint(std::string_view text, const R& codes) {
+  std::string w = cstr(text, codes);
+  std::fputs(w.c_str(), stdout);
+}
 int visible_len(std::string_view s);
 int rune_width(int cp);
 
diff --git a/render.cpp b/render.cpp
index b8a669a..d8cab80 100644
--- a/render.cpp
+++ b/render.cpp
@@ -59,8 +59,9 @@ static bool is_word_byte(unsigned char c) {
   return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'z') ||
          (c >= 'A' && c <= 'Z') || c == '_';
 }
+template<class R>
 static void wrap_pairs(std::string &dst, std::string_view src, std::string_view open,
-                       std::string_view close, std::span<const int> codes,
+                       std::string_view close, const R& codes,
                        bool boundary = false) {
   size_t olen = open.size(), clen = close.size();
   size_t p = 0;
diff --git a/util.cpp b/util.cpp
index 512c5f5..c7bf5e8 100644
--- a/util.cpp
+++ b/util.cpp
@@ -115,25 +115,6 @@ std::string filter_text(std::string_view s) {
 int g_col = 0;
 volatile int g_interrupted = 0;
 
-std::string cstr(std::string_view text, std::span<const int> codes) {
-  if (!g_col || codes.empty() || text.empty()) return std::string(text);
-  std::string s;
-  s.reserve(text.size() + 16);
-  s += "\033[";
-  for (size_t i = 0; i < codes.size(); i++) {
-    if (i) s += ';';
-    s += sfmt("%d", codes[i]);
-  }
-  s += "m";
-  s += text;
-  s += "\033[0m";
-  return s;
-}
-void cprint(std::string_view text, std::span<const int> codes) {
-  std::string w = cstr(text, codes);
-  std::fputs(w.c_str(), stdout);
-}
-
 int visible_len(std::string_view s) {
   int n = 0;
   const unsigned char *p = (const unsigned char *)s.data();