feat(compat): Check system and processor compatibility

Signed-off-by: Watson Wheeler <git@tazy.dev>

1 files changed, 43 insertions, 0 deletions

diff --git a/include/tinyff/compat.h b/include/tinyff/compat.h
new file mode 100644
index 0000000..0199513
--- /dev/null
+++ b/include/tinyff/compat.h
@@ -0,0 +1,43 @@
+#ifndef TINYFF_COMPAT_H_
+#define TINYFF_COMPAT_H_
+
+#if defined(__STDC_HOSTED__) && !(__STDC_HOSTED__ == 0)
+#   define COMPAT_HOSTED 1
+#else
+#   define COMPAT_HOSTED 0
+#endif
+
+#if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901L
+#   error "compat: ISO C99 or newer compiler required."
+#endif
+
+#include <limits.h>
+#include <stdint.h>
+
+#if INT_MAX < 32767
+#   error "compat: 8-bit 'int' architectures are not supported."
+#endif
+
+#if INTPTR_MAX == INT32_MAX
+#   define COMPAT_SZ_32 1
+#elif INTPTR_MAX == INT64_MAX
+#   define COMPAT_SZ_64 1
+#endif
+
+// Static assertion fallback for c99
+#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
+    // static_assert already in version
+#   include <assert.h>
+#else
+    // c99 dummy
+#   define COMPAT_STATIC_ASSERT(expr, msg) \
+        typedef char compat_assertion_failed##__LINE__[(expr) ? 1 : -1]
+
+#   undef static_assert
+#   define static_assert(expr, msg) COMPAT_STATIC_ASSERT(expr, msg)
+#endif
+
+static_assert(sizeof(uint8_t)  == 1, "compat: broken uint8_t width");
+static_assert(sizeof(uint32_t) == 4, "compat: broken uint32_t width");
+
+#endif