31715bd251
92/92 regression tests pass (+ffi-05-string-args).
Covers the four shapes that actually appear at the sx ↔ C boundary
today:
1. [:0]u8 string literal -> const char* (ffi_strlen, ffi_first_byte)
2. sx `string` value via .ptr (slice-decay branch in
coerceArg pulls the pointer)
3. [*]u8 raw buffer + length (ffi_sum_bytes, mutated via
ffi_write_byte and read back)
4. C-returned const char* (round-trips back as [*]u8)
The mutate-via-C path catches any pointer-aliasing regression — sx
allocates the fixed array `bytes : [4]u8`, passes `.ptr` to C which
writes index 1, and the sx side reads `bytes[1]` to confirm the
mutation took effect through the same memory.
15 lines
645 B
C
15 lines
645 B
C
// String / byte-pointer FFI baselines. Covers the three shapes
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// callers actually use at the sx ↔ C boundary:
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// - null-terminated `[:0]u8` (C-style string)
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// - raw byte pointer `[*]u8` + length (slice-style)
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// - sx `string` decayed to `ptr` (the slice-decay branch
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// in coerceArg pulls .ptr)
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#include <stddef.h>
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int ffi_strlen (const char *s);
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int ffi_first_byte (const char *s);
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int ffi_sum_bytes (const unsigned char *buf, int len);
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void ffi_write_byte (unsigned char *buf, int idx, unsigned char val);
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const char* ffi_static_greeting(void);
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