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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [libgloss/] [mips/] [syscalls.c] - Blame information for rev 258

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Line No. Rev Author Line
1 207 jeremybenn
#include <_ansi.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "regs.S"
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extern char _end[];
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/* FIXME: This is not ideal, since we do a get_mem_info() call for
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   every sbrk() call. */
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char *
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sbrk (nbytes)
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     int nbytes;
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{
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  static char *heap_ptr = _end;
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  static char *heap_start = _end;
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  char        *base;
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  struct s_mem {
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    unsigned int size;
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    unsigned int icsize;
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    unsigned int dcsize;
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  } mem;
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  unsigned int avail = 0;
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  /* The sizeof (s_mem.size) must be 4 bytes.  The compiler should be
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     able to eliminate this check */
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  if (sizeof (unsigned int) != 4)
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    return (char *)-1;
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  get_mem_info(&mem);
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  /* NOTE: The value returned from the get_mem_info call is the amount
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     of memory, and not the address of the (last byte + 1) */
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  if (((size_t)heap_ptr >= heap_start) && ((size_t)heap_ptr < (heap_start + mem.size))) {
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    avail = (heap_start + mem.size) - (size_t)heap_ptr;
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    base = heap_ptr;
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  } /* else will fail since "nbytes" will be greater than zeroed "avail" value */
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  if ((nbytes > avail) || (heap_ptr + nbytes < _end))
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   base = (char *)-1;
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  else
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   heap_ptr += nbytes;
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  return base;
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}

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