libfmemopen.c

#include <windows.h>
#include <share.h>
#include <io.h>
#include <fcntl.h>
#include <sys/stat.h>
#include "libfmemopen.h"
/* https://github.com/Arryboom/fmemopen_windows  */

FILE *fmemopen(void *buf, size_t len, const char *type)
{
	int fd;
	FILE *fp;
	char tp[MAX_PATH - 13];
	char fn[MAX_PATH + 1];
	int * pfd = &fd;
	int retner = -1;
	char tfname[] = "MemTF_";
	if (!GetTempPathA(sizeof(tp), tp))
		return NULL;
	if (!GetTempFileNameA(tp, tfname, 0, fn))
		return NULL;
	retner = _sopen_s(pfd, fn, _O_CREAT | _O_SHORT_LIVED | _O_TEMPORARY | _O_RDWR | _O_BINARY | _O_NOINHERIT, _SH_DENYRW, _S_IREAD | _S_IWRITE);
	if (retner != 0)
		return NULL;
	if (fd == -1)
		return NULL;
	fp = _fdopen(fd, "wb+");
	if (!fp) {
		_close(fd);
		return NULL;
	}
	/*File descriptors passed into _fdopen are owned by the returned FILE * stream.If _fdopen is successful, do not call _close on the file descriptor.Calling fclose on the returned FILE * also closes the file descriptor.*/
	fwrite(buf, len, 1, fp);
	rewind(fp);
	return fp;
}