3 files changed, 7 insertions, 9 deletions
diff --git a/lib9p/include/lib9p/9p.generated.h b/lib9p/include/lib9p/9p.generated.h
index d34a0f6..a1c9958 100644
--- a/lib9p/include/lib9p/9p.generated.h
+++ b/lib9p/include/lib9p/9p.generated.h
@@ -24,7 +24,7 @@
 	#error config.h must define CONFIG_9P_ENABLE_9P2000_e
 #else
 	#if CONFIG_9P_ENABLE_9P2000_e
-		#ifndef(CONFIG_9P_MAX_9P2000_e_WELEM)
+		#ifndef CONFIG_9P_MAX_9P2000_e_WELEM
 			#error if CONFIG_9P_ENABLE_9P2000_e then config.h must define CONFIG_9P_MAX_9P2000_e_WELEM
 		#endif
 		static_assert(CONFIG_9P_MAX_9P2000_e_WELEM > 0);
diff --git a/lib9p/include/lib9p/9p.h b/lib9p/include/lib9p/9p.h
index 7724fc8..44b5410 100644
--- a/lib9p/include/lib9p/9p.h
+++ b/lib9p/include/lib9p/9p.h
@@ -58,7 +58,7 @@ bool lib9p_ctx_has_error(struct lib9p_ctx *ctx);
 /** Write an static error into ctx, return -1.  */
 int lib9p_error(struct lib9p_ctx *ctx, uint32_t linux_errno, char const *msg);
 /** Write a printf-style error into ctx, return -1.  */
-int lib9p_errorf(struct lib9p_ctx *ctx, uint32_t linux_errno, char const *fmt, ...);
+int lib9p_errorf(struct lib9p_ctx *ctx, uint32_t linux_errno, char const *fmt, ...) [[gnu::format(printf, 3, 4)]];
 
 /* main T-message functions ***************************************************/
 
diff --git a/lib9p/include/lib9p/linux-errno.h.gen b/lib9p/include/lib9p/linux-errno.h.gen
index 8f4e0c8..2c736a2 100755
--- a/lib9p/include/lib9p/linux-errno.h.gen
+++ b/lib9p/include/lib9p/linux-errno.h.gen
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # lib9p/linux-errno.h.gen - Generate a C header from a list of errno numbers
 #
-# Copyright (C) 2024  Luke T. Shumaker <lukeshu@lukeshu.com>
+# Copyright (C) 2024-2025  Luke T. Shumaker <lukeshu@lukeshu.com>
 # SPDX-License-Identifier: AGPL-3.0-or-later
 
 import sys
@@ -13,7 +13,7 @@ def print_errnos() -> None:
     )
     errnos: dict[str, tuple[int, str]] = {}
     for txtlist in sys.argv[1:]:
-        with open(txtlist, "r") as fh:
+        with open(txtlist, "r", encoding="utf-8") as fh:
             for line in fh:
                 if line.startswith("#"):
                     print(f"/* {line[1:].strip()}  */")
@@ -26,12 +26,10 @@ def print_errnos() -> None:
     print("#ifndef _LIB9P_LINUX_ERRNO_H_")
     print("#define _LIB9P_LINUX_ERRNO_H_")
     print()
-    namelen = max(len(name) for name in errnos.keys())
+    namelen = max(len(name) for name in errnos)
     numlen = max(len(str(num)) for (num, desc) in errnos.values())
-    for name in errnos:
-        print(
-            f"#define LINUX_{name.ljust(namelen)}  {str(errnos[name][0]).rjust(numlen)}  /* {errnos[name][1]} */"
-        )
+    for name, [num, msg] in errnos.items():
+        print(f"#define LINUX_{name:<{namelen}}  {num:>{numlen}}  /* {msg} */")
     print()
     print("#endif /* _LIB9P_LINUX_ERRNO_H_ */")