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
---
 generic.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 generic.c

(limited to 'generic.c')

diff --git a/generic.c b/generic.c
new file mode 100644
index 0000000..fcfa94d
--- /dev/null
+++ b/generic.c
@@ -0,0 +1,62 @@
+#include "generic.h"
+
+/* "Instantiate" the inline functions of the "generic.h" header. */
+signed (maxs)(signed a, signed b) [[__unsequenced__]];
+unsigned (maxu)(unsigned a, unsigned b) [[__unsequenced__]];
+unsigned (maxus)(unsigned a, signed b) [[__unsequenced__]];
+unsigned (maxsu)(signed a, unsigned b) [[__unsequenced__]];
+signed long (maxsl)(signed long a, signed long b) [[__unsequenced__]];
+unsigned long (maxul)(unsigned long a, unsigned long b) [[__unsequenced__]];
+unsigned long (maxusl)(unsigned long a, signed long b) [[__unsequenced__]];
+unsigned long (maxsul)(signed long a, unsigned long b) [[__unsequenced__]];
+signed long long (maxsll)(signed long long a, signed long long b) [[__unsequenced__]];
+unsigned long long (maxull)(unsigned long long a, unsigned long long b) [[__unsequenced__]];
+unsigned long long (maxusll)(unsigned long long a, signed long long b) [[__unsequenced__]];
+unsigned long long (maxsull)(signed long long a, unsigned long long b) [[__unsequenced__]];
+
+int main(int argc, char* argv[argc+1]){
+  if (argc > 1) {
+    printf("testing strto functions: base 10 = %lu, general base = %llu\n",
+           strtoul10(argv[2]), strtoull(argv[2], nullptr));
+    long double a = strtold(argv[1]);
+    printf("minimum of %Lg and 1.0f is %Lg\n",
+           a, min(a, 1.0F));
+    printf("minimum of %g and argc is %g\n",
+           3.0, min(3.0, argc));
+  }
+  printf("maxof(1) = %d\n", maxof(1));
+  printf("maxof(1.0) = %g\n", maxof(1.0));
+  printf("maxof(long double) = %Lg\n", maxof(long double));
+  printf("minof(1ul) = %lu\n", minof(1ul));
+  printf("minof(1.0) = %g\n", minof(1.0));
+  printf("minof(long double) = %Lg\n", minof(long double));
+  printf("mix(1u, -1l) = %luul\n", mix(1u, -1l));
+  printf("mix(-1, 1ul) = %luul\n", mix(-1, 1ul));
+  printf("mix(-1, 1l) = %ldl\n", mix(-1, 1l));
+  printf("mix(1u, 2ul) = %luul\n", mix(1u, 2ul));
+  puts((memcpy)((char[6]){ 0 }, "hello", 6));
+  // Erroneous target buffer, should not be qualified. diagnostic?
+  puts((memcpy)((char volatile[6]){ 0 }, "he1lo", 6));
+  // Erroneous use of target buffer, using 6 where there are only 5. diagnostic?
+  puts((memcpy)((char[5]){ 0 }, "he2lo", 6));
+  // Erroneous use of source buffer, using 7 where there are only 6. diagnostic?
+  puts((memcpy)((char[7]){ 0 }, "he3lo", 7));
+  puts(memcpy((char[6]){ 0 }, "hello", 6));
+  // Erroneous target buffer, should not be qualified. diagnostic?
+  puts(memcpy((char volatile[6]){ 0 }, "he1lo", 6));
+  // Erroneous use of target buffer, using 6 where there are only 5. diagnostic?
+  puts(memcpy((char[5]){ 0 }, "he2lo", 6));
+  // Erroneous use of source buffer, using 7 where there are only 6. diagnostic?
+  puts(memcpy((char[7]){ 0 }, "he3lo", 7));
+  printf("snprintf(nullptr, 0, \"%%g\", 6.555): %d\n", snprintf(nullptr, 0, "%g", 6.555));
+  printf("snprintf(nullptr, 0, \"hoho\"): %d\n", snprintf(nullptr, 0, "hoho"));
+  // Erroneous use of nullptr when size is not zero. diagnostic?
+  printf("snprintf(nullptr, 0, \"%%g\", 6.555): %d\n", snprintf(nullptr, 20, "%g", 6.555));
+  printf("snprintf(nullptr, 0, \"hoho\"): %d\n", snprintf(nullptr, 20, "hoho"));
+  // Erroneous use of buffer, claiming 20 only providing 16. diagnostic?
+  printf("snprintf(something, 20, \"%%g\", 6.555): %d\n", snprintf((char[16]){ 0 }, 20, "%g", 6.555));
+  // Erroneous use of buffer, claiming 20 only providing 16. diagnostic?
+  printf("snprintf(something, 20, \"hoho\"): %d\n", snprintf((char[16]){ 0 }, 20, "hoho"));
+  return EXIT_SUCCESS;
+  SIZE_WIDTH;
+}
-- 
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