Makefiles define a set of rules that specify which files need to be compiled first, which files need to be compiled later, which files need to be recompiled, and even more complex functional operations, because makefiles are like Shell scripts that also execute operating system commands. One of the benefits of Makefiles is that they are “automatically compiled”. The entire project is automatically compiled, greatly improving the efficiency of software development.

Hyperscan is a high-performance regular expression matching library from Intel. It is based on the X86 platform based on PCRE prototype development. While supporting most of the syntax of PCRE, Hyperscan adds specific syntax and working modes to ensure its usefulness in real-world network scenarios.

Getline ()/get()/read() will read one more line. The cause may be a problem with the file itself or the getline() function. You can judge getLine ()/get()/read() while checking, and then process the data if you get it.

MXML (Minimal XML) is a small, fast and versatile library that reads a whole XML file and puts it in a DOM tree.

Hash table is a very important data structure, which is useful in many application scenarios. This paper will simply analyze the principle of hash table, and use C language to achieve a complete HashMap.