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, 26 insertions, 0 deletions

diff --git a/test-strfrom.c b/test-strfrom.c
new file mode 100644
index 0000000..7c5316b
--- /dev/null
+++ b/test-strfrom.c
@@ -0,0 +1,26 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+#define testIt(FUNC, F, V)                      \
+  do {                                          \
+    char buf[256];                              \
+    int ret = FUNC(buf, 256, (F), (V));         \
+    printf("%d: %s\n", ret, buf);               \
+  } while (0)
+
+int main(void) {
+  testIt(strfromd, "%g", 1.0/7);
+  testIt(strfromd, "%.6766g", 1.0/7);
+  testIt(strfromd, "%.0000000000000000000000000000000000000000000006766g", 1.0/7);
+  testIt(strfroml, "%g", 1.0L/7);
+  testIt(strfroml, "%.6766g", 1.0L/7);
+  testIt(strfroml, "%.0000000000000000000000000000000000000000000006766g", 1.0L/7);
+  testIt(strfroml, "%.547996766g", 1.0L/7);
+  testIt(strfromd, "%a", 1.0/7);
+  testIt(strfromd, "%.6766a", 1.0/7);
+  testIt(strfromd, "%.0000000000000000000000000000000000000000000006766a", 1.0/7);
+  testIt(strfroml, "%a", 1.0L/7);
+  testIt(strfroml, "%.6766a", 1.0L/7);
+  testIt(strfroml, "%.0000000000000000000000000000000000000000000006766a", 1.0L/7);
+  testIt(strfroml, "%.547996766a", 1.0L/7);
+}