27 lines
894 B
Plaintext
27 lines
894 B
Plaintext
// BufAlloc.init returns the state BY VALUE: the caller's local is the
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// allocator state and the FULL buffer is usable. Regression: init used
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// to carve its own struct off the buffer's head (returning *BufAlloc
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// into the buffer), so a 128-byte buffer could only serve 104 bytes —
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// the second 64-byte allocation below failed with null.
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#import "modules/std.sx";
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#import "modules/std/mem.sx";
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main :: () {
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stack_buf : [128]u8 = ---;
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buf := BufAlloc.init(@stack_buf[0], 128);
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a : Allocator = xx buf;
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b1 := a.alloc_bytes(64);
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b2 := a.alloc_bytes(64); // fills the buffer EXACTLY
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b1_ok := b1 != null;
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b2_ok := b2 != null;
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print("full capacity: {} {} pos={}\n", b1_ok, b2_ok, buf.pos);
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b3 := a.alloc_bytes(1); // one byte over — must fail
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print("over: {}\n", b3 == null);
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buf.reset();
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print("reset: {}\n", buf.pos);
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}
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