Permission is granted to use, modify, and / or redistribute at will.
*/
-/* This is an example implementation of _PDCLIB_allocpages() (declared in
- _PDCLIB_config.h), fit for use with POSIX kernels.
+/* This is a stub implementation of _PDCLIB_allocpages
*/
#include <stdint.h>
#include <stddef.h>
-
-int brk( void * );
-void * sbrk( intptr_t );
-
-#ifndef _PDCLIB_GLUE_H
-#define _PDCLIB_GLUE_H _PDCLIB_GLUE_H
#include <_PDCLIB_glue.h>
-#endif
+#include <errno.h>
static void * membreak = NULL;
-void * _PDCLIB_allocpages( int const n )
+void * _PDCLIB_allocpages( size_t n )
{
- if ( membreak == NULL )
- {
- /* first call, make sure end-of-heap is page-aligned */
- intptr_t unaligned = 0;
- membreak = sbrk( 0 );
- unaligned = _PDCLIB_PAGESIZE - (intptr_t)membreak % _PDCLIB_PAGESIZE;
- if ( unaligned < _PDCLIB_PAGESIZE )
- {
- /* end-of-heap not page-aligned - adjust */
- if ( sbrk( unaligned ) != membreak )
- {
- /* error */
- return NULL;
- }
- membreak = (char *)membreak + unaligned;
- }
- }
- /* increasing or decreasing heap - standard operation */
- void * oldbreak = membreak;
- membreak = (void *)( (char *)membreak + ( n * _PDCLIB_PAGESIZE ) );
- if ( brk( membreak ) == 0 )
- {
- /* successful */
- return oldbreak;
- }
- else
- {
- /* out of memory */
- membreak = oldbreak;
- return NULL;
- }
+ errno = ENOTSUP;
+ return NULL;
}
#ifdef TEST
int main( void )
{
-#ifndef REGTEST
- {
- char * startbreak = sbrk( 0 );
- TESTCASE( _PDCLIB_allocpages( 0 ) );
- TESTCASE( ( (char *)sbrk( 0 ) - startbreak ) <= _PDCLIB_PAGESIZE );
- startbreak = sbrk( 0 );
- TESTCASE( _PDCLIB_allocpages( 1 ) );
- TESTCASE( sbrk( 0 ) == startbreak + ( 1 * _PDCLIB_PAGESIZE ) );
- TESTCASE( _PDCLIB_allocpages( 5 ) );
- TESTCASE( sbrk( 0 ) == startbreak + ( 6 * _PDCLIB_PAGESIZE ) );
- TESTCASE( _PDCLIB_allocpages( -3 ) );
- TESTCASE( sbrk( 0 ) == startbreak + ( 3 * _PDCLIB_PAGESIZE ) );
- }
-#endif
return TEST_RESULTS;
}