mem_alloc

SFL
Version 2.10

`mem_alloc_`

#include "sflmem.h"
void *
mem_alloc_ (
    MEMTRN     *trn,                    /*  Associated transaction           */
    size_t      size,                   /*  Desired size of memory block     */
    const char *filename,               /*  Name of source file making call  */
    size_t      lineno                  /*  Line number in calling source    */
)

Synopsis

Allocates a memory block. Use the mem_alloc() macro to call this function! Use mem free () to free blocks allocated with this function. Returns a pointer to the allocated memory block, or NULL if there was not enough memory available. The supplied source file name is assumed to be in a static area. The requested block size must be greater than zero bytes.

Source Code - (sflmem.c)

{
    MEMHDR
       *ptr;                            /*  Allocated memory block           */

    /*  Allocate block with extra space for the header                       */
    ASSERT (size > 0);                  /*  Cannot allocate zero bytes!      */

    ptr = malloc (RESERVE_SIZE + size);
    if (ptr == NULL)                    /*  If nothing free, do a hunt       */
      {                                 /*    and try again...               */
        mem_scavenge ();
        ptr = malloc (RESERVE_SIZE + size);
        if (ptr == NULL)
            return (NULL);              /*  Really in trouble now!           */
      }
#   if (defined (MEM_TRACE))
    trace ("%s (%d): alloc %d bytes->%p",
            filename? filename: "-", lineno, size, ptr);
#   endif

    ptr-> tag  = MEMTAG;                /*  Initialise block header          */
    ptr-> size = size;                  /*  Size of block                    */
    ptr-> file = filename;              /*  Who allocated it                 */
    ptr-> line = lineno;                /*    and where                      */

    if (!trn)                           /*  If no transaction then use the   */
        trn = &mem_list;                /*  main block list                  */

    list_reset (ptr);                   /*  Set up new block as list         */
    list_relink_before (ptr,            /*  Add to list of blocks            */
                        &trn-> memhdr);

    mem_total += size;                  /*  Keep count of space used         */
    mem_alloc_count += 1;               /*    and number of allocations      */

    return (HDR_2_CLIENT (ptr));        /*   and return client address       */
}

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