[libglnx] dirfd,xattrs: Port mostly to new code style

[Colin Walters <walters src gnome org>]

commit 66d162873c6f23d4628af80aa1f46fdf2d9e5e07
Author: Colin Walters <walters verbum org>
Date:   Fri May 26 16:01:29 2017 -0400

    dirfd,xattrs: Port mostly to new code style
    
    Not everything, but a good chunk of the remaining bits.

 glnx-dirfd.c  |   39 ++++-------------
 glnx-xattrs.c |  129 ++++++++++++++-------------------------------------------
 2 files changed, 42 insertions(+), 126 deletions(-)
---
diff --git a/glnx-dirfd.c b/glnx-dirfd.c
index 12b983c..388f2a3 100644
--- a/glnx-dirfd.c
+++ b/glnx-dirfd.c
@@ -99,19 +99,14 @@ glnx_dirfd_iterator_init_at (int                     dfd,
                              GLnxDirFdIterator      *out_dfd_iter,
                              GError                **error)
 {
-  gboolean ret = FALSE;
   glnx_fd_close int fd = -1;
-  
   if (!glnx_opendirat (dfd, path, follow, &fd, error))
-    goto out;
+    return FALSE;
 
-  if (!glnx_dirfd_iterator_init_take_fd (fd, out_dfd_iter, error))
-    goto out;
-  fd = -1; /* Transfer ownership */
+  if (!glnx_dirfd_iterator_init_take_fd (glnx_steal_fd (&fd), out_dfd_iter, error))
+    return FALSE;
 
-  ret = TRUE;
- out:
-  return ret;
+  return TRUE;
 }
 
 /**
@@ -128,24 +123,16 @@ glnx_dirfd_iterator_init_take_fd (int                dfd,
                                   GLnxDirFdIterator *dfd_iter,
                                   GError           **error)
 {
-  gboolean ret = FALSE;
   GLnxRealDirfdIterator *real_dfd_iter = (GLnxRealDirfdIterator*) dfd_iter;
-  DIR *d = NULL;
-
-  d = fdopendir (dfd);
+  DIR *d = fdopendir (dfd);
   if (!d)
-    {
-      glnx_set_prefix_error_from_errno (error, "%s", "fdopendir");
-      goto out;
-    }
+    return glnx_throw_errno_prefix (error, "fdopendir");
 
   real_dfd_iter->fd = dfd;
   real_dfd_iter->d = d;
   real_dfd_iter->initialized = TRUE;
 
-  ret = TRUE;
- out:
-  return ret;
+  return TRUE;
 }
 
 /**
@@ -165,31 +152,25 @@ glnx_dirfd_iterator_next_dent (GLnxDirFdIterator  *dfd_iter,
                                GCancellable       *cancellable,
                                GError             **error)
 {
-  gboolean ret = FALSE;
   GLnxRealDirfdIterator *real_dfd_iter = (GLnxRealDirfdIterator*) dfd_iter;
 
   g_return_val_if_fail (out_dent, FALSE);
   g_return_val_if_fail (dfd_iter->initialized, FALSE);
 
   if (g_cancellable_set_error_if_cancelled (cancellable, error))
-    goto out;
+    return FALSE;
 
   do
     {
       errno = 0;
       *out_dent = readdir (real_dfd_iter->d);
       if (*out_dent == NULL && errno != 0)
-        {
-          glnx_set_prefix_error_from_errno (error, "%s", "fdopendir");
-          goto out;
-        }
+        return glnx_throw_errno_prefix (error, "readdir");
     } while (*out_dent &&
              (strcmp ((*out_dent)->d_name, ".") == 0 ||
               strcmp ((*out_dent)->d_name, "..") == 0));
 
-  ret = TRUE;
- out:
-  return ret;
+  return TRUE;
 }
 
 /**
diff --git a/glnx-xattrs.c b/glnx-xattrs.c
index eadb6b1..3c1a9c5 100644
--- a/glnx-xattrs.c
+++ b/glnx-xattrs.c
@@ -270,31 +270,22 @@ set_all_xattrs_for_path (const char    *path,
                          GCancellable  *cancellable,
                          GError       **error)
 {
-  gboolean ret = FALSE;
-  int i, n;
-
-  n = g_variant_n_children (xattrs);
-  for (i = 0; i < n; i++)
+  const guint n = g_variant_n_children (xattrs);
+  for (guint i = 0; i < n; i++)
     {
       const guint8* name;
       g_autoptr(GVariant) value = NULL;
-      const guint8* value_data;
-      gsize value_len;
-
       g_variant_get_child (xattrs, i, "(^&ay@ay)",
                            &name, &value);
-      value_data = g_variant_get_fixed_array (value, &value_len, 1);
-      
+
+      gsize value_len;
+      const guint8* value_data = g_variant_get_fixed_array (value, &value_len, 1);
+
       if (lsetxattr (path, (char*)name, (char*)value_data, value_len, 0) < 0)
-        {
-          glnx_set_prefix_error_from_errno (error, "%s", "lsetxattr");
-          goto out;
-        }
+        return glnx_throw_errno_prefix (error, "lsetxattr");
     }
 
-  ret = TRUE;
- out:
-  return ret;
+  return TRUE;
 }
 
 /**
@@ -347,35 +338,22 @@ glnx_fd_set_all_xattrs (int            fd,
                         GCancellable  *cancellable,
                         GError       **error)
 {
-  gboolean ret = FALSE;
-  int i, n;
-
-  n = g_variant_n_children (xattrs);
-  for (i = 0; i < n; i++)
+  const guint n = g_variant_n_children (xattrs);
+  for (guint i = 0; i < n; i++)
     {
       const guint8* name;
-      const guint8* value_data;
       g_autoptr(GVariant) value = NULL;
-      gsize value_len;
-      int res;
-
       g_variant_get_child (xattrs, i, "(^&ay@ay)",
                            &name, &value);
-      value_data = g_variant_get_fixed_array (value, &value_len, 1);
-      
-      do
-        res = fsetxattr (fd, (char*)name, (char*)value_data, value_len, 0);
-      while (G_UNLIKELY (res == -1 && errno == EINTR));
-      if (G_UNLIKELY (res == -1))
-        {
-          glnx_set_prefix_error_from_errno (error, "%s", "fsetxattr");
-          goto out;
-        }
+
+      gsize value_len;
+      const guint8* value_data = g_variant_get_fixed_array (value, &value_len, 1);
+
+      if (TEMP_FAILURE_RETRY (fsetxattr (fd, (char*)name, (char*)value_data, value_len, 0)) < 0)
+        return glnx_throw_errno_prefix (error, "fsetxattr");
     }
 
-  ret = TRUE;
- out:
-  return ret;
+  return TRUE;
 }
 
 /**
@@ -395,35 +373,17 @@ glnx_lgetxattrat (int            dfd,
                   GError       **error)
 {
   char pathbuf[PATH_MAX];
-  GBytes *bytes = NULL;
-  ssize_t bytes_read, real_size;
-  guint8 *buf;
-
   snprintf (pathbuf, sizeof (pathbuf), "/proc/self/fd/%d/%s", dfd, subpath);
 
-  do
-    bytes_read = lgetxattr (pathbuf, attribute, NULL, 0);
-  while (G_UNLIKELY (bytes_read < 0 && errno == EINTR));
-  if (G_UNLIKELY (bytes_read < 0))
-    {
-      glnx_set_error_from_errno (error);
-      goto out;
-    }
+  ssize_t bytes_read, real_size;
+  if (TEMP_FAILURE_RETRY (bytes_read = lgetxattr (pathbuf, attribute, NULL, 0)) < 0)
+    return glnx_null_throw_errno_prefix (error, "lgetxattr");
 
-  buf = g_malloc (bytes_read);
-  do
-    real_size = lgetxattr (pathbuf, attribute, buf, bytes_read);
-  while (G_UNLIKELY (real_size < 0 && errno == EINTR));
-  if (G_UNLIKELY (real_size < 0))
-    {
-      glnx_set_error_from_errno (error);
-      g_free (buf);
-      goto out;
-    }
+  g_autofree guint8 *buf = g_malloc (bytes_read);
+  if (TEMP_FAILURE_RETRY (real_size = lgetxattr (pathbuf, attribute, buf, bytes_read)) < 0)
+    return glnx_null_throw_errno_prefix (error, "lgetxattr");
 
-  bytes = g_bytes_new_take (buf, real_size);
- out:
-  return bytes;
+  return g_bytes_new_take (g_steal_pointer (&buf), real_size);
 }
 
 /**
@@ -439,33 +399,16 @@ glnx_fgetxattr_bytes (int            fd,
                       const char    *attribute,
                       GError       **error)
 {
-  GBytes *bytes = NULL;
   ssize_t bytes_read, real_size;
-  guint8 *buf;
 
-  do
-    bytes_read = fgetxattr (fd, attribute, NULL, 0);
-  while (G_UNLIKELY (bytes_read < 0 && errno == EINTR));
-  if (G_UNLIKELY (bytes_read < 0))
-    {
-      glnx_set_error_from_errno (error);
-      goto out;
-    }
+  if (TEMP_FAILURE_RETRY (bytes_read = fgetxattr (fd, attribute, NULL, 0)) < 0)
+    return glnx_null_throw_errno_prefix (error, "fgetxattr");
 
-  buf = g_malloc (bytes_read);
-  do
-    real_size = fgetxattr (fd, attribute, buf, bytes_read);
-  while (G_UNLIKELY (real_size < 0 && errno == EINTR));
-  if (G_UNLIKELY (real_size < 0))
-    {
-      glnx_set_error_from_errno (error);
-      g_free (buf);
-      goto out;
-    }
+  g_autofree guint8 *buf = g_malloc (bytes_read);
+  if (TEMP_FAILURE_RETRY (real_size = fgetxattr (fd, attribute, buf, bytes_read)) < 0)
+    return glnx_null_throw_errno_prefix (error, "fgetxattr");
 
-  bytes = g_bytes_new_take (buf, real_size);
- out:
-  return bytes;
+  return g_bytes_new_take (g_steal_pointer (&buf), real_size);
 }
 
 /**
@@ -490,18 +433,10 @@ glnx_lsetxattrat (int            dfd,
                   GError       **error)
 {
   char pathbuf[PATH_MAX];
-  int res;
-
   snprintf (pathbuf, sizeof (pathbuf), "/proc/self/fd/%d/%s", dfd, subpath);
 
-  do
-    res = lsetxattr (subpath, attribute, value, len, flags);
-  while (G_UNLIKELY (res == -1 && errno == EINTR));
-  if (G_UNLIKELY (res == -1))
-    {
-      glnx_set_error_from_errno (error);
-      return FALSE;
-    }
+  if (TEMP_FAILURE_RETRY (lsetxattr (subpath, attribute, value, len, flags)) < 0)
+    return glnx_throw_errno_prefix (error, "lsetxattr");
 
   return TRUE;
 }