libgloss/riscv/semihost-sys_write.c

   1 /*
   2  * Copyright (C) 2020 Embecosm Limited
   3  * SPDX-License-Identifier: BSD-2-Clause
   4  */
   5 #include <machine/syscall.h>
   6 #include <sys/types.h>
   7 #include "semihost_syscall.h"
   8 #include "semihost_fdtable.h"
   9
  10 /* Write to a file.  */
  11 ssize_t
  12 _write (int file, const void *ptr, size_t len)
  13 {
  14   struct fdentry *fd =__get_fdentry (file);
  15   long data_block[3];
  16   long res;
  17
  18   if (fd == NULL)
  19     return -1;
  20
  21   data_block[0] = fd->handle;
  22   data_block[1] = (long) ptr;
  23   data_block[2] = len;
  24   res = syscall_errno (SEMIHOST_write, data_block);
  25   if (res >= 0)
  26     {
  27       ssize_t bytes_written = len - res;
  28       fd->pos += bytes_written;
  29       return bytes_written;
  30     }
  31   return -1;
  32 }