Question

We called a library to read text, this library API only accepts a FILE* pointer. It actually reads file text by fread() call internally.

But we also need to use this library to read text from a char* string rather than a FILE*.

Of course we can write the char* string into a temp file but we’re not allowed to do this for some reasons…

How to do ? Thanks !!

Answer 1

Check out fmemopen

The fmemopen() function shall associate the buffer given by the buf argument with a stream.

#include <stdio.h>

static char buffer[] = "foobar";

int main (void)
{
  FILE *stream;

  stream = fmemopen (buffer, strlen (buffer), "r");

  /* You got a FILE* pointer, you can call your function here :-) */
}