int (char @NotNull [] cbuf, int off, int len) { if (off < 0 || off > cbuf.length || len < 0 || off + len > cbuf.length || off + len < 0) { throw new IndexOutOfBoundsException("cbuf.length="+cbuf.length+"; off="+off+"; len="+len); } if (len == 0) { return 0; } if (myText instanceof CharArrayCharSequence) { // Optimization final int readChars = ((CharArrayCharSequence)myText).readCharsTo(myCurPos, cbuf, off, len); if (readChars < 0) return -1; myCurPos += readChars; return readChars; } int charsToCopy = Math.min(len, myText.length() - myCurPos); if (charsToCopy <= 0) return -1; for (int n = 0; n < charsToCopy; n++) { cbuf[n + off] = myText.charAt(n + myCurPos); } myCurPos += charsToCopy; return charsToCopy; }