lstr

an stb-style single header lib for length-prefixed strings in C, in ~50 LOC.

from the primary type's definition:

lstr is a length-prefixed string that looks and
behaves like a standard null-terminated string.

It can only be created, modified and freed by
lstr_* functions, but it can be read by standard
null-terminated string readers, like printf.

usage

#define LSTR_IMPLEMENTATION before lstr.h in one source file, and include lstr.h wherever it's used.