sdk/lib/drivers/lwip/src/rosmem.c

   1 #include "lwip/opt.h"
   2
   3 #include "lwip/def.h"
   4 #include "lwip/mem.h"
   5
   6 #ifndef LWIP_TAG
   7     #define LWIP_TAG 'PIwl'
   8 #endif
   9
  10 void *
  11 malloc(mem_size_t size)
  12 {
  13     return ExAllocatePoolWithTag(NonPagedPool, size, LWIP_TAG);
  14 }
  15
  16 void *
  17 calloc(mem_size_t count, mem_size_t size)
  18 {
  19     void *mem = malloc(count * size);
  20
  21     if (!mem) return NULL;
  22
  23     RtlZeroMemory(mem, count * size);
  24
  25     return mem;
  26 }
  27
  28 void
  29 free(void *mem)
  30 {
  31     ExFreePoolWithTag(mem, LWIP_TAG);
  32 }
  33
  34 /* This is only used to trim in lwIP */
  35 void *
  36 realloc(void *mem, size_t size)
  37 {
  38     void* new_mem;
  39
  40     /* realloc() with a NULL mem pointer acts like a call to malloc() */
  41     if (mem == NULL) {
  42         return malloc(size);
  43     }
  44
  45     /* realloc() with a size 0 acts like a call to free() */
  46     if (size == 0) {
  47         free(mem);
  48         return NULL;
  49     }
  50
  51     /* Allocate the new buffer first */
  52     new_mem = malloc(size);
  53     if (new_mem == NULL) {
  54         /* The old buffer is still intact */
  55         return NULL;
  56     }
  57
  58     /* Copy the data over */
  59     RtlCopyMemory(new_mem, mem, size);
  60
  61     /* Deallocate the old buffer */
  62     free(mem);
  63
  64     /* Return the newly allocated block */
  65     return new_mem;
  66 }