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- Subject: Re: Proposal: Virtualization of Filesystem Operations for Lua 5.2.
- From: Sean Conner <sean@...>
- Date: Thu, 3 Nov 2011 14:37:08 -0400
It was thus said that the Great Luiz Henrique de Figueiredo once stated:
> > then I found out about the various extentions that the GNU C library provides
> For the lazy among us, could you please summarize those extensions or
> point to a document? Thanks.
I found out about them by going through stdio.h under Linux, and doing a
man on the functions found therein. For instance:
fmemopen, open_memstream, open_wmemstream - open memory as stream
FILE *fmemopen(void *buf, size_t size, const char *mode);
FILE *open_memstream(char **ptr, size_t *sizeloc);
FILE *open_wmemstream(wchar_t **ptr, size_t *sizeloc);
The fmemopen() function opens a stream that permits the access speci‐
fied by mode. The stream allows I/O to be performed on the string or
memory buffer pointed to by buf. This buffer must be at least size
fopencookie - opening a custom stream
FILE *fopencookie(void *cookie, const char *mode,
The fopencookie() function allows the programmer to create a custom
implementation for a standard I/O stream. This implementation can
store the stream's data at a location of its own choosing; for example,
fopencookie() is used to implement fmemopen(3), which provides a stream
interface to data that is stored in a buffer in memory.
There's more at
http://www.gnu.org/software/libc/manual/html_mono/libc.html (warning: huge
file) but it does describe not only the standard functions, but other
functions than the GNU C library provides (including the above).
-spc (And that covers the library calls---the GNU C compiler has any
number of extentions as well ... )