gdbsupport: move fileio_errno_to_host to fileio.{h,cc} and rename

gdb_bfd.c and remote.c contain identical implementations of a
fileio_error -> errno function.  Factor that out to
gdbsupport/fileio.{h,cc}.

Rename it fileio_error_to_host, for symmetry with host_to_fileio_error.

Change-Id: Ib9b8807683de2f809c94a5303e708acc2251a0df

2 files changed, 57 insertions, 0 deletions

diff --git a/gdbsupport/fileio.cc b/gdbsupport/fileio.cc
index db7c1a7c488..60a08f64977 100644
--- a/gdbsupport/fileio.cc
+++ b/gdbsupport/fileio.cc
@@ -78,6 +78,59 @@ host_to_fileio_error (int error)
 /* See fileio.h.  */
 
 int
+fileio_error_to_host (fileio_error errnum)
+{
+  switch (errnum)
+    {
+      case FILEIO_EPERM:
+	return EPERM;
+      case FILEIO_ENOENT:
+	return ENOENT;
+      case FILEIO_EINTR:
+	return EINTR;
+      case FILEIO_EIO:
+	return EIO;
+      case FILEIO_EBADF:
+	return EBADF;
+      case FILEIO_EACCES:
+	return EACCES;
+      case FILEIO_EFAULT:
+	return EFAULT;
+      case FILEIO_EBUSY:
+	return EBUSY;
+      case FILEIO_EEXIST:
+	return EEXIST;
+      case FILEIO_ENODEV:
+	return ENODEV;
+      case FILEIO_ENOTDIR:
+	return ENOTDIR;
+      case FILEIO_EISDIR:
+	return EISDIR;
+      case FILEIO_EINVAL:
+	return EINVAL;
+      case FILEIO_ENFILE:
+	return ENFILE;
+      case FILEIO_EMFILE:
+	return EMFILE;
+      case FILEIO_EFBIG:
+	return EFBIG;
+      case FILEIO_ENOSPC:
+	return ENOSPC;
+      case FILEIO_ESPIPE:
+	return ESPIPE;
+      case FILEIO_EROFS:
+	return EROFS;
+      case FILEIO_ENOSYS:
+	return ENOSYS;
+      case FILEIO_ENAMETOOLONG:
+	return ENAMETOOLONG;
+    }
+  return -1;
+}
+
+/* See fileio.h.  */
+
+int
 fileio_to_host_openflags (int fileio_open_flags, int *open_flags_p)
 {
   int open_flags = 0;
diff --git a/gdbsupport/fileio.h b/gdbsupport/fileio.h
index 6a5297c6433..203e671f3e7 100644
--- a/gdbsupport/fileio.h
+++ b/gdbsupport/fileio.h
@@ -139,6 +139,10 @@ struct fio_timeval
 
 extern fileio_error host_to_fileio_error (int error);
 
+/* Convert a File-I/O error number to a host-format errno value.  */
+
+extern int fileio_error_to_host (fileio_error errnum);
+
 /* Convert File-I/O open flags FFLAGS to host format, storing
    the result in *FLAGS.  Return 0 on success, -1 on error.  */