3855f2351e
vendors/ is a third-party namespace (stb_image, kb_text_shape, etc.);
test fixtures don't belong there. The .c/.h companion files for the
Phase-0 FFI baselines now sit alongside the .sx that drives them in
examples/, with matching basenames:
examples/ffi-01-primitives.{sx,c,h} <- was vendors/ffi_primitives/
examples/ffi-02-small-struct.{sx,c,h} <- was vendors/ffi_structs/
examples/ffi-03-large-struct.{sx,c,h} <- was vendors/ffi_large_struct/
examples/ffi-04-fp-struct.{sx,c,h} <- was vendors/ffi_fp_struct/
examples/ffi-05-string-args.{sx,c,h} <- was vendors/ffi_strings/
examples/ffi-06-callback.{sx,c,h} <- was vendors/ffi_callback/
examples/101-ffi-medium-struct.{sx,c} <- was vendors/ffi_medium_struct/
`#source` / `#include` paths in the .sx files become bare filenames
(no prefix) since imports.zig's base_dir resolution finds them
relative to the importing .sx file's directory.
`library/vendors/sx_ffi_resolve_test/` stays put — that one's the
whole point: regression coverage for the stdlib-search branch of
the resolution chain, so it must live where ONLY that branch can
find it.
94/94 regression tests pass.
50 lines
2.2 KiB
Plaintext
50 lines
2.2 KiB
Plaintext
// Phase 0 baseline (PLAN-FFI.md step 0.5): the three shapes that
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// actually appear at the sx ↔ C boundary today:
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//
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// 1. Null-terminated `[:0]u8` — passed by `.ptr` to a `const char *`.
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// 2. Raw byte buffer `[*]u8` — pointer + explicit length.
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// 3. sx `string` value — coerceArg's "fat-pointer decay" branch
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// pulls `.ptr` automatically for `*u8`/
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// `[:0]u8` params (string is `{ptr, len}`).
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// 4. Pointer return from C — round-trips back as `[*]u8` / `*u8`.
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#import "modules/std.sx";
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#import c {
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#source "ffi-05-string-args.c";
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};
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ffi_strlen :: (s: [:0]u8) -> s32 #foreign;
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ffi_first_byte :: (s: [:0]u8) -> s32 #foreign;
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ffi_sum_bytes :: (buf: [*]u8, len: s32) -> s32 #foreign;
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ffi_write_byte :: (buf: [*]u8, idx: s32, v: u8) -> void #foreign;
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ffi_static_greeting :: () -> [*]u8 #foreign;
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main :: () -> s32 {
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// ── [:0]u8 null-terminated literal ─────────────────────────────
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msg : [:0]u8 = "hello";
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print("strlen(\"hello\") = {}\n", ffi_strlen(msg));
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print("first_byte = {}\n", ffi_first_byte(msg));
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// ── sx `string` → C `const char *` (slice-decay through coerceArg) ─
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s : string = "sx string here";
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print("strlen(sx string) = {}\n", ffi_strlen(xx s.ptr));
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// ── [*]u8 raw buffer + length ──────────────────────────────────
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bytes : [4]u8 = .[10, 20, 30, 40];
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bp : [*]u8 = xx @bytes[0];
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print("sum_bytes([10,20,30,40]) = {}\n", ffi_sum_bytes(bp, 4));
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// ── Mutate buffer via C, read back from sx ─────────────────────
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ffi_write_byte(bp, 1, 99);
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print("bytes[1] after write = {}\n", bytes[1]);
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// ── C returns a static string pointer; read it byte-by-byte ────
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g := ffi_static_greeting();
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n := ffi_strlen(xx g);
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print("static greeting len = {}\n", n);
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print("static greeting [0] = {}\n", g[0]);
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0;
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}
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