[Fun things in the C standard library] glibc implementation of strlen

辛昕

[Fun things in the C standard library] glibc implementation of strlen [Copy link]

Source insight is a paid service after all. It is indeed useful, but sometimes I can't find a completely cracked version, and it is really annoying to be reminded once every 30 days. In addition, my company's computer cannot upload code normally, so online tools have become my first choice. I have already chosen an online C/C++ compiler before, and that compiler is simple enough. Now I will choose another online editor to view code. In particular, the corresponding post to be viewed is glibc's strlen.c As usual, since it is a company computer, I can't upload the code - next time I go home, I will slowly tinker with it and then post the source code. Now, I will post a few pictures to let everyone feel it. A small strlen has many tricks. It seems that writing a C standard library is really not a fun thing. First of all, I recommend you to use SourceInsight. I guess everyone likes to use such a famous tool. First, search for the implementation of strlen. I was intimidated by this. 5 implementations, 3 functions, and 2 macro definitions. However, after a closer look, there is a name with i386, which means it is probably related to the machine type. I am a little relieved. Although I still look at it carefully, but, have you noticed that it seems that none of them are similar to our implementation? There are always some strange and unfamiliar function calls.

辛昕

Frankly speaking, I didn't understand any of it. There are also some grammatical blind spots in it, which I believe most people don't encounter normally. ——In the past, I have always wondered how to read a code or a library seriously. If Linux is too large and too far away from us, then perhaps reading an open source implementation of the C standard library is the most meaningful. However, I didn't know where to start at the time. Now, I found that I was suddenly very interested in strlen, so I thought that maybe in this way, starting with one or two functions, I might be able to make a breakthrough in reading the C standard library little by little. Stay tuned.

littleshrimp

Playing at such a low level

人民币的幻想

Can the leader not dig a hole? If you have dug one, fill it up quickly, otherwise you will be beaten

大道明德

Awesome, I don't know how awesome it is. Let's code it and see

辛昕

The Fantasy of RMB was published on 2017-11-2 09:08 Can the leader not dig a hole? If you have dug it, fill it up quickly, otherwise you will be beaten

Isn’t this starting to fill it up?......

青城山下

The writing style inside is somewhat unconventional

okhxyyo

Xin Xin, you didn't say anything.

辛昕

okhxyyo posted on 2017-12-6 15:37 Xin Xin, you didn't say anything

I forgot to update for a long time, Sao Rui

辛昕

okhxyyo posted on 2017-12-6 15:37 Xin Xin, you didn't say anything

Since you mentioned it, let's start from here.