Import official C23 code examples for Modern C (Jens Gustedt, 2024)HEADupstream-importmain

- Add official C source files, Makefile, c23-fallback.h, and LICENSE
- Update README.md with study mirror notice

1 files changed, 40 insertions, 0 deletions

diff --git a/macro_trace.c b/macro_trace.c
new file mode 100644
index 0000000..1ecda7a
--- /dev/null
+++ b/macro_trace.c
@@ -0,0 +1,40 @@
+#include "macro_trace.h"
+#include <tgmath.h>
+#include <stdlib.h>
+
+char const* trace_skip(char const expr[static 1]);
+
+void trace_values(FILE* s,
+                  char const func[static 1],
+                  char const line[static 1],
+                  char const expr[static 1],
+                  char const head[static 1],
+                  size_t len, long double const arr[len]);
+
+
+int main(int argc, char* argv[]) {
+  double sum = argc > 1 ? strtod(argv[1], 0) : 0x1P-1;
+  TRACE_PRINT0("my favorite variable: %g\n", sum);
+  TRACE_PRINT1("my favorite variable: %g", sum);
+  TRACE_PRINT2("my favorite variable: %g", sum);
+  TRACE_VALUE0("my favorite value:", sum);
+  TRACE_PTR0("my favorite pointer:", argv);
+  TRACE_PTR1("my favorite pointer:", argv);
+  TRACE_PRINT3("my favorite variable: %g", sum);
+  TRACE_PRINT4("my favorite variable: %g", sum);
+  TRACE_PRINT5("my favorite variable: %g", sum);
+  TRACE_PRINT5("a good expression: %g", sum*argc);
+  TRACE_PRINT6("a collection: %g, %i", sum, argc);
+  TRACE_PRINT7("a string");
+  TRACE_PRINT8("a collection: %g, %i", sum, argc);
+  TRACE_PRINT8("another string");
+  TRACE_PRINT9("a collection: %g, %i", sum*acos(0), argc);
+  TRACE_VALUES("an untyped collection:", sum, argc, acos(0)*2);
+  TRACE_VALUES("an untyped \"collection\":", sum, argc, acos(0)*2);
+  TRACE_VALUES("just one element:", acos(0)*2);
+  TRACE_VALUES("empty");
+  TRACE_VALUES("\"empty\"");
+  TRACE_VALUE1("my favorite value:", sum);
+  TRACE_VALUE1("another value:", 0x1111111111111);
+  TRACE_VALUE1("my favorite pointer:", argv);
+}