在 Forth 中，'expect' 读了多少个字符？

Question

Forth-83 spec定义单词expect如下：

      EXPECT       addr +n --                    M,83                 
           Receive characters and store each into memory.  The transfer
           begins at addr proceeding towards higher addresses one byte
           per character until either a "return" is received or until
           +n characters have been transferred.  No more than +n
           characters will be stored.  The "return" is not stored into
           memory.  No characters are received or transferred if +n is
           zero.  All characters actually received and stored into
           memory will be displayed, with the "return" displaying as a
           space.

因此，它最多读取但不包括 RETURN 或 EOL。

但是没有终止符，也没有 return读取的字符数，我怎么知道字符串在哪里结束？

Leo Brodie 引用了一个词 accept，它的作用非常相似，具有签名 ( addr +n -- +m )。这确实 return 读取的字符数，这是我所期望的。但这不在规范中...

Answer 1

standard还定义了SPAN，它告诉你读取的字符数。

另请注意，在新标准中此功能已过时，请改用 ACCEPT。

在 Forth 中，'expect' 读了多少个字符？

In Forth, how many characters does 'expect' read?

forth