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I can make a file pointer write to a file with fopen(). But can I make a file pointer that will make it so calling functions such as fputc or fprintf will write to a pointer in memory? An example of this is ByteArrayOutputStream in java. Also: could I run it in reverse, where a library needs a file pointer to read from, so I allocate memory, and make a new file pointer that will read from this memory location but return EOF when the size of the chunk runs out? (like ByteArrayInputStream in Java). Is there a way to do this in C? For example: FILE *p = new_memory_file_pointer(); fprintf(p, "Hello World!\n"); char *data = get_written_stuff(p); printf("%s", data); //will print Hello World! && / || char s[] = "Hello World!\n"; FILE *p = new_memory_file_pointer_read(s, sizeof(s)); char *buffer = (char *)malloc( 1024*sizeof(char) ); fread((void *)buffer, 1, sizeof(s), p); printf("%s", buffer); //prints Hello World! EDIT: To those reading this question years later, in addition to the accepted answer, you should look at open_memstream(3) , which behaves more like these Java classes than fmemopen does.

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