int: Backport C23's _WIDTH macros

1 files changed, 54 insertions, 0 deletions

diff --git a/tests/int.c b/tests/int.c
new file mode 100644
index 0000000..db59e90
--- /dev/null
+++ b/tests/int.c
@@ -0,0 +1,54 @@
+// Copyright © Tavian Barnes <tavianator@tavianator.com>
+// SPDX-License-Identifier: 0BSD
+
+#include "../src/int.h"
+#include "../src/diag.h"
+#include <limits.h>
+#include <stdint.h>
+
+bfs_static_assert(UMAX_WIDTH(0x1) == 1);
+bfs_static_assert(UMAX_WIDTH(0x3) == 2);
+bfs_static_assert(UMAX_WIDTH(0x7) == 3);
+bfs_static_assert(UMAX_WIDTH(0xF) == 4);
+bfs_static_assert(UMAX_WIDTH(0xFF) == 8);
+bfs_static_assert(UMAX_WIDTH(0xFFF) == 12);
+bfs_static_assert(UMAX_WIDTH(0xFFFF) == 16);
+
+#define UWIDTH_MAX(n) (2 * ((UINTMAX_C(1) << ((n) - 1)) - 1) + 1)
+#define IWIDTH_MAX(n) UWIDTH_MAX((n) - 1)
+#define IWIDTH_MIN(n) (-(intmax_t)IWIDTH_MAX(n) - 1)
+
+bfs_static_assert(UCHAR_MAX == UWIDTH_MAX(UCHAR_WIDTH));
+bfs_static_assert(SCHAR_MIN == IWIDTH_MIN(SCHAR_WIDTH));
+bfs_static_assert(SCHAR_MAX == IWIDTH_MAX(SCHAR_WIDTH));
+
+bfs_static_assert(USHRT_MAX == UWIDTH_MAX(USHRT_WIDTH));
+bfs_static_assert(SHRT_MIN == IWIDTH_MIN(SHRT_WIDTH));
+bfs_static_assert(SHRT_MAX == IWIDTH_MAX(SHRT_WIDTH));
+
+bfs_static_assert(UINT_MAX == UWIDTH_MAX(UINT_WIDTH));
+bfs_static_assert(INT_MIN == IWIDTH_MIN(INT_WIDTH));
+bfs_static_assert(INT_MAX == IWIDTH_MAX(INT_WIDTH));
+
+bfs_static_assert(ULONG_MAX == UWIDTH_MAX(ULONG_WIDTH));
+bfs_static_assert(LONG_MIN == IWIDTH_MIN(LONG_WIDTH));
+bfs_static_assert(LONG_MAX == IWIDTH_MAX(LONG_WIDTH));
+
+bfs_static_assert(ULLONG_MAX == UWIDTH_MAX(ULLONG_WIDTH));
+bfs_static_assert(LLONG_MIN == IWIDTH_MIN(LLONG_WIDTH));
+bfs_static_assert(LLONG_MAX == IWIDTH_MAX(LLONG_WIDTH));
+
+bfs_static_assert(SIZE_MAX == UWIDTH_MAX(SIZE_WIDTH));
+bfs_static_assert(PTRDIFF_MIN == IWIDTH_MIN(PTRDIFF_WIDTH));
+bfs_static_assert(PTRDIFF_MAX == IWIDTH_MAX(PTRDIFF_WIDTH));
+
+bfs_static_assert(UINTPTR_MAX == UWIDTH_MAX(UINTPTR_WIDTH));
+bfs_static_assert(INTPTR_MIN == IWIDTH_MIN(INTPTR_WIDTH));
+bfs_static_assert(INTPTR_MAX == IWIDTH_MAX(INTPTR_WIDTH));
+
+bfs_static_assert(UINTMAX_MAX == UWIDTH_MAX(UINTMAX_WIDTH));
+bfs_static_assert(INTMAX_MIN == IWIDTH_MIN(INTMAX_WIDTH));
+bfs_static_assert(INTMAX_MAX == IWIDTH_MAX(INTMAX_WIDTH));
+
+int main(void) {
+}