From b3e9e62599532050fc776c5e8f076915b56c2235 Mon Sep 17 00:00:00 2001
From: David Faulkner <d@davo.co>
Date: Fri, 7 Aug 2026 23:40:47 -0500
Subject: Import official C23 code examples for Modern C (Jens Gustedt, 2024)

- Add official C source files, Makefile, c23-fallback.h, and LICENSE
- Update README.md with study mirror notice
---
 enum.c | 93 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 enum.c

(limited to 'enum.c')

diff --git a/enum.c b/enum.c
new file mode 100644
index 0000000..73c21a4
--- /dev/null
+++ b/enum.c
@@ -0,0 +1,93 @@
+#include "c23-fallback.h"
+#include <stdio.h>
+
+typedef enum echar echar;
+enum echar {
+  mchar = UCHAR_MAX,
+};
+
+typedef enum eshort eshort;
+enum eshort {
+  mshort = USHRT_MAX,
+};
+
+typedef enum eint eint;
+enum eint {
+  mint = UINT_MAX,
+};
+
+typedef enum elong elong;
+enum elong {
+  mlong = ULONG_MAX,
+};
+
+typedef enum ellong ellong;
+enum ellong {
+  mllong = ULLONG_MAX,
+};
+
+#ifdef UINT128_MAX
+typedef enum e128 e128;
+enum e128 {
+  m128 = UINT128_MAX,
+};
+#endif
+
+#if __has_feature(c_fixed_enum) || (__clang_major__ > 7)
+
+enum fchar : unsigned char {
+  nchar = UCHAR_MAX,
+};
+typedef enum fchar fchar;
+
+enum fshort : unsigned short {
+  nshort = USHRT_MAX,
+};
+typedef enum fshort fshort;
+
+enum fint : unsigned {
+  nint = UINT_MAX,
+};
+typedef enum fint fint;
+
+enum flong : unsigned long {
+  nlong = ULONG_MAX,
+};
+typedef enum flong flong;
+
+enum fllong : unsigned long long {
+  nllong = ULLONG_MAX,
+};
+typedef enum fllong fllong;
+
+#ifdef UINT128_MAX
+enum f128 : uint128_t {
+  n128 = UINT128_MAX,
+};
+typedef enum f128 f128;
+#endif
+#else
+# warning "test for fixed underlying integer type skipped"
+#endif
+
+int main(void) {
+  printf("echar:\t%zu\t%zu\n", sizeof(echar), sizeof(mchar));
+  printf("eshort:\t%zu\t%zu\n", sizeof(eshort), sizeof(mshort));
+  printf("eint:\t%zu\t%zu\n", sizeof(eint), sizeof(mint));
+  printf("elong:\t%zu\t%zu\n", sizeof(elong), sizeof(mlong));
+  printf("ellong:\t%zu\t%zu\n", sizeof(ellong), sizeof(mllong));
+#ifdef UINT128_MAX
+  printf("e128:\t%zu\t%zu\n", sizeof(e128), sizeof(m128));
+#endif
+
+#if __has_feature(c_fixed_enum) || (__clang_major__ > 7)
+  printf("fchar:\t%zu\t%zu\n", sizeof(fchar), sizeof(nchar));
+  printf("fshort:\t%zu\t%zu\n", sizeof(fshort), sizeof(nshort));
+  printf("fint:\t%zu\t%zu\n", sizeof(fint), sizeof(nint));
+  printf("flong:\t%zu\t%zu\n", sizeof(flong), sizeof(nlong));
+  printf("fllong:\t%zu\t%zu\n", sizeof(fllong), sizeof(nllong));
+# ifdef UINT128_MAX
+  printf("f128:\t%zu\t%zu\n", sizeof(f128), sizeof(n128));
+# endif
+#endif
+}
-- 
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