Learning Redis source code [dynamic strings]

This section describes how Redis implements its own string sds because there is no string in Standard C. Source File sds. h sds. c analyze the data structure [cpp] // sds type typedef char * sds; // sdshdr structure struct sdshdr {// The length occupied by the buf int len; // The remaining available length of the buf int free; // char buf [];} Where the string data is actually saved; features support new, dump, cat, cpy, printf, trim, range, tolower/toupper, cmp, split, fromlonglong, and hex conversion. Tip: sds is like memory management, but it is a management character. You need to save its length and free space and use pre-allocated space to expand sds to support automatic expansion.