build-sys: import build system from darvaza.org/core

Signed-off-by: Alejandro Mery <amery@jpi.io>
2023-08-28 19:44:01 +00:00
1 changed files with 0 additions and 68 deletions
@@ -1,68 +0,0 @@
 package core
 import (
 	"bytes"
 	"io"
 	"io/fs"
 	"strings"
 )
 var (
 	_ io.Reader = (*ReadCloser)(nil)
 	_ io.Closer = (*ReadCloser)(nil)
 )
 // ReadCloser adds a Close() to Readers without one
 type ReadCloser struct {
 	r io.Reader
 }
 // Read passes the Read() call to the underlying [io.Reader]
 // and fail if it was Closed()
 func (rc *ReadCloser) Read(b []byte) (int, error) {
 	switch {
 	case rc.r != nil:
 		return rc.r.Read(b)
 	default:
 		return 0, fs.ErrClosed
 	}
 }
 // Close attempts to Close the underlying [io.Reader], or
 // remove it if it doesn't support Close() and fail
 // if closed twice
 func (rc *ReadCloser) Close() error {
 	switch p := rc.r.(type) {
 	case io.Closer:
 		return p.Close()
 	case nil:
 		return fs.ErrClosed
 	default:
 		rc.r = nil
 		return nil
 	}
 }
 // NewReadCloser wraps a [io.Reader] to satisfy
 // [io.ReadCloser]
 func NewReadCloser(r io.Reader) *ReadCloser {
 	if r == nil {
 		return nil
 	}
 	return &ReadCloser{
 		r: r,
 	}
 }
 // NewReadCloserBytes wraps a bytes slice to implement
 // a [io.ReadCloser]
 func NewReadCloserBytes(b []byte) *ReadCloser {
 	return NewReadCloser(bytes.NewReader(b))
 }
 // NewReadCloserString wraps a string to implement
 // a [io.ReadCloser]
 func NewReadCloserString(s string) *ReadCloser {
 	return NewReadCloser(strings.NewReader(s))
 }