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
---
 test-c8.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 test-c8.c

(limited to 'test-c8.c')

diff --git a/test-c8.c b/test-c8.c
new file mode 100644
index 0000000..204841b
--- /dev/null
+++ b/test-c8.c
@@ -0,0 +1,54 @@
+#include <uchar.h>
+#include <stdio.h>
+#include <string.h>
+#include <locale.h>
+
+void print_string(char const*s) {
+  char const*str = s;
+  size_t n = strlen(str)+1;
+  char8_t buffer[n+1];
+  printf("mb→utf8, source: '%s', sliced: ", str);
+  mbstate_t mb = { 0 };
+  for (char8_t *p = buffer; ; p++) {
+    size_t res = mbrtoc8(p, str, n, &mb);
+    if (res > -3) {
+      printf("!error:%zu!\n", -res);
+      return;
+    } else if (res == -3) {
+      printf(",%hhx", *p);
+    } else if (res) {
+      printf("|%hhx", *p);
+      str += res;
+    } else {
+      printf("(%hhx)", *p);
+      str++;
+      break;
+    }
+  }
+  printf("; target: %s\n", buffer);
+  memset(buffer, 0, sizeof buffer);
+  char *p = (char*)buffer;
+  printf("utf8→mb, source: '%s', ", s);
+  for (char const *q = s; ; q++) {
+    size_t res = c8rtomb(p, *q, &mb);
+    if (res) {
+      switch (res) {
+      default: printf("∞"); res = -1; break;
+      case 4: printf("<-->"); break;
+      case 3: printf("<->"); break;
+      case 2: printf("<>"); break;
+      case 1: printf("x"); break;
+      }
+      if (!*p || (res == -1)) break;
+      else p += res;
+    }
+  }
+  printf("; target: %s\n", buffer);
+}
+
+int main(int argc, char* argv[static argc+1]) {
+  if (argc > 1)
+    setlocale(LC_ALL, "");
+  print_string(u8"abcdäα⌫");
+  print_string(u8"→😇");
+}
-- 
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