Posixfio is a C++ library that wraps around POSIX functions for reading files, in addition to a few utility functions (such as readAll, readLeast, writeAll, writeLeast) and I/O buffers (both array-based and dynamically allocated).

Posixfio is written with Linux in mind, but it does have an incomplete and non-identical MSVC implementation that works for simple applications
(like, for example, open -> read -> write -> close chains).

The main advantages over STL streams are the smaller overhead and the greater control over file operations (and the buffers themselves).
The biggest disadvantages are:

• input needs type-agnostic parsing, due to ::read, ::write and ::mmap using void*;
• formatted output requires some labor;
• ::open takes a C-style string for file names, requiring a null-character terminator (which is less of a big disadvantage and more of a massive, seemingly avoidable inconvenience).