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mem: BufAlloc.init returns the state by value — full buffer usable, no header carve

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agra
2026-06-11 17:31:20 +03:00
parent a47ea1416e
commit 51194a26d8
42 changed files with 158 additions and 129 deletions
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16
library/modules/std/mem.sx
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@@ -220,9 +220,13 @@ impl Allocator for Arena {
// --- BufAlloc: bump allocator backed by a user-provided slice ---
//
// `init` returns the BufAlloc by value (the caller's local IS the
// state, like every allocator); the FULL buffer is usable — no bytes
// are carved off its head for the state struct.
//
// Usage:
// stack_buf : [128]u8 = ---;
// buf := BufAlloc.init(@stack_buf[0], 128); // *BufAlloc
// buf := BufAlloc.init(@stack_buf[0], 128); // BufAlloc
// push Context.{ allocator = xx buf, data = null } { ... }
// buf.reset();
@@ -231,14 +235,8 @@ BufAlloc :: struct {
len: s64;
pos: s64;
init :: (buf: [*]u8, len: s64) -> *BufAlloc {
self_size :: size_of(BufAlloc);
if len < self_size { return null; }
b : *BufAlloc = xx buf;
b.buf = @buf[self_size];
b.len = len - self_size;
b.pos = 0;
b
init :: (buf: [*]u8, len: s64) -> BufAlloc {
BufAlloc.{ buf = buf, len = len, pos = 0 }
}
reset :: (b: *BufAlloc) {