#ifndef REGTEST
+#include <inttypes.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <_PDCLIB_glue.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+extern struct _PDCLIB_file_t * _PDCLIB_filelist;
+
+/* This is an example implementation of tmpfile() fit for use with POSIX
+ POSIX kernels.
+*/
struct _PDCLIB_file_t * tmpfile( void )
{
- /* TODO: Implement */
- return NULL;
+ FILE * rc;
+ /* This is the chosen way to get high-quality randomness. Replace as
+ appropriate.
+ */
+ FILE * randomsource = fopen( "/dev/urandom", "rb" );
+ char filename[ L_tmpnam ];
+ _PDCLIB_fd_t fd;
+ if ( randomsource == NULL )
+ {
+ return NULL;
+ }
+ for ( ;; )
+ {
+ /* Get a filename candidate. What constitutes a valid filename and
+ where temporary files are usually located is platform-dependent,
+ which is one reason why this function is located in the platform
+ overlay. The other reason is that a *good* implementation should
+ use high-quality randomness instead of a pseudo-random sequence to
+ generate the filename candidate, which is *also* platform-dependent.
+ */
+ uint32_t random;
+ fscanf( randomsource, "%" SCNu32, &random );
+ sprintf( filename, "/tmp/%010" PRNu32 ".tmp", random );
+ /* Check if file of this name exists. Note that fopen() is a very weak
+ check, which does not take e.g. access permissions into account
+ (file might exist but not readable). Replace with something more
+ appropriate.
+ */
+ fd = open( filename, O_CREAT | O_EXCL | O_RDWR, S_IRUSR | S_IWUSR );
+ if ( fd != -1 )
+ {
+ break;
+ }
+ close( fd );
+ }
+ fclose( randomsource );
+ /* See fopen(). */
+ if ( ( rc = calloc( 1, sizeof( struct _PDCLIB_file_t ) + _PDCLIB_UNGETCBUFSIZE + L_tmpnam + BUFSIZ ) ) == NULL )
+ {
+ /* No memory to set up FILE structure */
+ close( fd );
+ return NULL;
+ }
+ rc->status = _PDCLIB_filemode( "wb+" ) | _PDCLIB_LIBBUFFER | _IOLBF | _PDCLIB_DELONCLOSE;
+ rc->handle = fd;
+ rc->ungetbuf = (unsigned char *)rc + sizeof( struct _PDCLIB_file_t );
+ rc->filename = (char *)rc->ungetbuf + _PDCLIB_UNGETCBUFSIZE;
+ rc->buffer = rc->filename + L_tmpnam;
+ strcpy( rc->filename, filename );
+ rc->bufsize = BUFSIZ;
+ rc->bufidx = 0;
+ rc->ungetidx = 0;
+ rc->next = _PDCLIB_filelist;
+ _PDCLIB_filelist = rc;
+ return rc;
}
#endif
}
#endif
+