git.sur5r.net Git - freertos/blob - Demo/RX200_RX210-RSK_Renesas/RTOSDemo/Renesas-Files/sbrk.c

   1 #include <stddef.h>\r
   2 #include <stdio.h>\r
   3 #define HEAPSIZE        0x400\r
   4 signed char *sbrk( size_t size );\r
   5 union HEAP_TYPE\r
   6 {\r
   7         signed long dummy;\r
   8         signed char heap[HEAPSIZE];\r
   9 };\r
  10 static union HEAP_TYPE  heap_area;\r
  11 \r
  12 /* End address allocated by sbrk */\r
  13 static signed char              *brk = ( signed char * ) &heap_area;\r
  14 signed char *sbrk( size_t size )\r
  15 {\r
  16         signed char *p;\r
  17         if( brk + size > heap_area.heap + HEAPSIZE )\r
  18         {\r
  19                 p = ( signed char * ) - 1;\r
  20         }\r
  21         else\r
  22         {\r
  23                 p = brk;\r
  24                 brk += size;\r
  25         }\r
  26 \r
  27         return p;\r
  28 }\r