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//========================================================================

//

//      malloc.cxx

//

//      Implementation of ISO C memory allocation routines

//

//========================================================================

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// or inline functions from this file, or you compile this file and link it

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//========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):     jlarmour

// Contributors:  

// Date:          2000-04-30

// Purpose:       Provides ISO C calloc(), malloc(), realloc() and free()

//                functions

// Description:   Implementation of ISO standard allocation routines as per

//                ISO C section 7.10.3

// Usage:       

//

//####DESCRIPTIONEND####

//

//========================================================================

// CONFIGURATION

#include <pkgconf/memalloc.h>   // Configuration header

// Do we want these functions?

#ifdef CYGPKG_MEMALLOC_MALLOC_ALLOCATORS

// INCLUDES

#include <cyg/infra/cyg_type.h>    // Common type definitions and support

#include <cyg/infra/cyg_trac.h>    // Common tracing support

#include <cyg/infra/cyg_ass.h>     // Common assertion support

#include <string.h>                // For memset() and memmove()

#include <stdlib.h>                // header for this file

#ifdef CYGBLD_MEMALLOC_MALLOC_EXTERNAL_HEAP_H

# include CYGBLD_MEMALLOC_MALLOC_EXTERNAL_HEAP_H

#else

# include <pkgconf/heaps.hxx>       // heap pools information

#endif

#include CYGBLD_MEMALLOC_MALLOC_IMPLEMENTATION_HEADER

// STATIC VARIABLES

// First deal with the worst case, that the memory layout didn't define a

// heap

#if CYGMEM_HEAP_COUNT == 0

// the data space for the memory pool

cyg_uint8 cyg_memalloc_mallocpool_memory[

    CYGNUM_MEMALLOC_FALLBACK_MALLOC_POOL_SIZE ] CYGBLD_ATTRIB_WEAK;

// the memory pool object itself

CYGCLS_MEMALLOC_MALLOC_IMPL cyg_memalloc_mallocpool

   CYGBLD_ATTRIB_INIT_BEFORE( CYG_INIT_LIBC ) =

   CYGCLS_MEMALLOC_MALLOC_IMPL( cyg_memalloc_mallocpool_memory,

                                sizeof( cyg_memalloc_mallocpool_memory ) );

# define POOL cyg_memalloc_mallocpool

#elif CYGMEM_HEAP_COUNT == 1

// one heap, so it's straightforward

# define POOL (*cygmem_memalloc_heaps[0])

#else 

// multiple heaps

# include <cyg/memalloc/memjoin.hxx>

Cyg_Mempool_Joined<CYGCLS_MEMALLOC_MALLOC_IMPL> cyg_memalloc_mallocpool

   CYGBLD_ATTRIB_INIT_BEFORE( CYG_INIT_LIBC ) =

     Cyg_Mempool_Joined<CYGCLS_MEMALLOC_MALLOC_IMPL>(

       CYGMEM_HEAP_COUNT, cygmem_memalloc_heaps

     );

# define POOL cyg_memalloc_mallocpool

#endif

// FUNCTIONS

void *

malloc( size_t size )

{

    void *data_ptr;

    CYG_REPORT_FUNCNAMETYPE( "malloc", "returning pointer %08x" );

    CYG_REPORT_FUNCARG1DV( size );

#ifdef CYGSEM_MEMALLOC_MALLOC_ZERO_RETURNS_NULL

    // first check if size wanted is 0

    if ( 0 == size ) {

        CYG_REPORT_RETVAL( NULL );

        return NULL;

    } // if

#endif

    // ask the pool for the data

    data_ptr = POOL.try_alloc( size );

    // if it isn't NULL is the pointer valid?

    if ( NULL != data_ptr ) {

        CYG_CHECK_DATA_PTR( data_ptr,

                            "allocator returned invalid pointer!" );

        // And just check its alignment

        CYG_ASSERT( !((CYG_ADDRWORD)data_ptr & (sizeof(CYG_ADDRWORD) - 1)),

                    "Allocator has returned badly aligned data!");

    } // if

    CYG_REPORT_RETVAL( data_ptr );

    return data_ptr;

} // malloc()

void

free( void *ptr )

{

    cyg_bool freeret;

    CYG_REPORT_FUNCNAME( "free");

    CYG_REPORT_FUNCARG1XV( ptr );

    // if null pointer, do nothing as per spec

    if ( NULL==ptr )

        return;

    CYG_CHECK_DATA_PTR( ptr, "Pointer to free isn't even valid!" );

    // get pool to free it

    freeret = POOL.free( (cyg_uint8 *) ptr );

    CYG_ASSERT( freeret , "Couldn't free!" );

    CYG_REPORT_RETURN();

} // free()

void *

calloc( size_t nmemb, size_t size )

{

    void *data_ptr;

    cyg_ucount32 realsize;

    CYG_REPORT_FUNCNAMETYPE( "calloc", "returning pointer %08x" );

    CYG_REPORT_FUNCARG2DV( nmemb, size );

    realsize = nmemb * size;

    data_ptr = malloc( realsize );

    // Fill with 0's if non-NULL

    if ( data_ptr != NULL )

        memset( data_ptr, 0, realsize );

    CYG_REPORT_RETVAL( data_ptr );

    return data_ptr;

} // calloc()

externC void *

realloc( void *ptr, size_t size )

{

    cyg_int32 oldsize;

    CYG_REPORT_FUNCNAMETYPE( "realloc", "returning pointer %08x" );

    CYG_REPORT_FUNCARG2( "ptr=%08x, size=%d", ptr, size );

    // if pointer is NULL, we must malloc it

    if ( ptr == NULL ) {

        ptr = malloc( size );

        CYG_REPORT_RETVAL( ptr );

        return ptr;

    } // if

    CYG_CHECK_DATA_PTR( ptr, "realloc() passed a bogus pointer!" );

    // if size is 0, we must free it

    if (size == 0) {

        free(ptr);

        CYG_REPORT_RETVAL( NULL );

        return NULL;

    } // if

    void *newptr;

    // otherwise try to resize allocation

    newptr = POOL.resize_alloc( (cyg_uint8 *)ptr, size, &oldsize );

    if ( NULL == newptr ) {

        // if resize_alloc doesn't return a pointer, it failed, so we

        // just have to allocate new space instead, and later copy it

        CYG_ASSERT( oldsize != 0,

                    "resize_alloc() couldn't determine allocation size!" );

        newptr = malloc( size );

        if ( NULL != newptr ) {

            memcpy( newptr, ptr, size < (size_t) oldsize ? size

                    : (size_t) oldsize );

            free( ptr );

        }

    }

    CYG_REPORT_RETVAL( newptr );

    return newptr;

} // realloc()

externC struct mallinfo

mallinfo( void )

{

    struct mallinfo ret = { 0 }; // initialize to all zeros

    Cyg_Mempool_Status stat;

    CYG_REPORT_FUNCTION();

    POOL.get_status( CYG_MEMPOOL_STAT_ARENASIZE|

                     CYG_MEMPOOL_STAT_FREEBLOCKS|

                     CYG_MEMPOOL_STAT_TOTALALLOCATED|

                     CYG_MEMPOOL_STAT_TOTALFREE|

                     CYG_MEMPOOL_STAT_MAXFREE, stat );

    if ( stat.arenasize > 0 )

        ret.arena = stat.arenasize;

    if ( stat.freeblocks > 0 )

        ret.ordblks = stat.freeblocks;

    if ( stat.totalallocated > 0 )

        ret.uordblks = stat.totalallocated;

    if ( stat.totalfree > 0 )

        ret.fordblks = stat.totalfree;

    if ( stat.maxfree > 0 )

        ret.maxfree = stat.maxfree;

    CYG_REPORT_RETURN();

    return ret;

} // mallinfo()

#endif // ifdef CYGPKG_MEMALLOC_MALLOC_ALLOCATORS

// EOF malloc.cxx