什么是\ 363 \ 353 \ 377 \ 377 \ 377 \ 177? [英] What is \363\353\377\377\377\177?

问题描述

(gdb) p (char*)0x7fffffffe9c8
$16 = 0x7fffffffe9c8 "\363\353\377\377\377\177"

它看起来既不是ascii也不是多字节，那是什么?

It doesn't look like ascii nor multibyte,what's that?

推荐答案

这些是八进制字符逃脱.它们通常用于将没有字节含义的字节插入字符串或需要具有特定的二进制值.例如，\377是十六进制值ff或十进制255，它是ASCII中的ÿ，但是在这种情况下很可能具有非常不同的含义.

These are octal character escapes. They are usually used to insert bytes into a string that don't have a meaning as text or need to have a certain binary value. \377 for instance is the hexadecimal value ff or decimal 255 which would be this ÿ in ASCII but most likely has a very different meaning in this context.

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