42 lines
539 B
V
42 lines
539 B
V
import io
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struct Buf {
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pub:
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bytes []byte
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mut:
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i int
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}
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struct Writ {
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pub mut:
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bytes []byte
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}
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fn (mut b Buf) read(mut buf []byte) ?int {
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if !(b.i < b.bytes.len) {
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return none
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}
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n := copy(buf, b.bytes[b.i..])
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b.i += n
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return n
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}
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fn (mut w Writ) write(buf []byte) ?int {
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if buf.len <= 0 {
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return none
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}
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w.bytes << buf
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return buf.len
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}
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fn test_copy() {
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src := Buf{
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bytes: 'abcdefghij'.repeat(10).bytes()
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}
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mut dst := Writ{
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bytes: []byte{}
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}
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io.cp(src, mut dst) or { assert false }
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assert dst.bytes == src.bytes
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}
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