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I’ve been enjoying writing libraries in C and being able to use them both from native applications and in web apps via WASM. I personally avoid emscripten and just implement the minimal C/JS glue and utilities myself.

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What library or such if any do you use for string.h/math.h/snprintf and such?

For snprintf I use stb sprintf [1]. For the reasonable functions from string.h (memset, memcpy, memmove), you can just use compiler builtins (__builtin_memset, etc.) as long as you enable the bulk memory extension (-mbulk-memory). I haven’t needed much of math.h for the stuff I’ve made, when I have I just called stuff on the `Math` object in javascript.

[1] https://github.com/nothings/stb/blob/master/stb_sprintf.h

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