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Asked: 2026-05-16T00:53:03+00:00

I am facing a problem where the C library exposes only an interface that

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I am facing a problem where the C library exposes only an interface that writes the data to a C FILE structure. This means all the data get saved to disk. I want this library to save the data to memory instead.

Is there a way to emulate FILE structure in my code and make it save the data in memory instead? I imagine FILE has various pointers to functions and I could write my own functions and make them allocate memory and on fwrite write the data to memory.

Can this be done?

Thanks, Boda Cydo.

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1 Answer

  1. Editorial Team

    A portable solution would be to use fmemopen or open_memstream if these functions are available (they’ve been part of GNU libc for a long time and they were added to POSIX in 2008) and simply write to a temporary file then read back into memory if they’re not.

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