old-c-code/demos/alloc_perm.h
2021-10-24 16:13:48 -07:00

39 lines
743 B
C

#define MAX_PERM_BLOCK 131072
/*
* Allocate some permanent memory.
* Permanent memory is never freed,
* pointers into it may be copied safely.
*/
void *alloc_perm( int sMem )
{
static char *pMemPerm;
static int iMemPerm;
void *pMem;
while ( sMem % sizeof(long) != 0 )
sMem++;
if ( sMem > MAX_PERM_BLOCK )
{
printf("\n\rAlloc_perm: %d too large.", sMem );
exit( 1 );
}
if ( pMemPerm == NULL || iMemPerm + sMem > MAX_PERM_BLOCK )
{
iMemPerm = 0;
if ( ( pMemPerm = calloc( 1, MAX_PERM_BLOCK ) ) == NULL )
{
perror( "Alloc_perm" );
exit( 1 );
}
}
pMem = pMemPerm + iMemPerm;
iMemPerm += sMem;
// nAllocPerm += 1;
// sAllocPerm += sMem;
return pMem;
}