mongoose/docs/c-api/mbuf.h/intro.md

title	symbol_kind	decl_name	items
Memory Buffers	intro	mbuf.h	name mbuf_append.md name mbuf_free.md name mbuf_init.md name mbuf_insert.md name mbuf_remove.md name mbuf_resize.md name mbuf_trim.md name struct_mbuf.md

Mbufs are mutable/growing memory buffers, like C++ strings. Mbuf can append data to the end of a buffer or insert data into arbitrary position in the middle of a buffer. The buffer grows automatically when needed.