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C streams as volatile buffers: volatilestreams

what

volatile stream = stdio FILE* stream as a temporary dynamically allocated (and deallocated) memory buffer.

why

Because it is convenient sometimes to see a dynamic temporary buffer as a FILE *.

  • fmemopen(3) uses a fixed size buffer
  • open_memfile(3) "opens a stream for writing to a memory buffer". Posix specifies that it is for output only

volstream_open opens a dynamically allocated, variable sized, R/W stream.

how

Just open the file as follows:

FILE *f = volstream_open();

and then use any f- stdio function on it: fwrite, fseek, fread, fprintf....

The buffer will be automatically freed at:

fclose(f);

where

Examples of usage: https://github.com/virtualsquare/vuos/blob/master/vufs/vufs_getdents.c, https://github.com/virtualsquare/vuos/blob/master/vufuse/vufuseop.c. (fill in a buffer to virtualize getdents(2)).

references:

https://github.com/rd235/libvolatilestream