Re: [PATCH] Allow build without dirent.d_type, fix "ls (host)" crash

[Christian Franke]

Second version of the patch.

It fixes another bug: missing fseek() in grub_hostfs_read().

Christian

2007-11-02  Christian Franke  <address@hidden>

        * util/hostfs.c (is_dir): New function.
        (grub_hostfs_dir):  Handle missing dirent.d_type case.
        (grub_hostfs_read): Add missing fseek().
        (grub_hostfs_label): Clear label pointer. This fixes a crash
        of grub-emu on "ls (host)".



--- grub2.orig/util/hostfs.c    2007-08-02 19:24:06.000000000 +0200
+++ grub2/util/hostfs.c 2007-11-02 21:31:37.703125000 +0100
@@ -25,6 +25,29 @@
 #include <dirent.h>
 #include <stdio.h>
 
+
+#ifndef DT_DIR
+/* dirent.d_type is a BSD extension, not part of POSIX */
+#include <sys/stat.h>
+#include <string.h>
+
+static int
+is_dir(const char *path, const char *name)
+{
+  int len1 = strlen(path), len2 = strlen(name);
+  char pathname[len1+1+len2+1+13];
+  struct stat st;
+  strcpy (pathname, path);
+  /* Avoid UNC-path "//name" on Cygwin */
+  if (len1 > 0 && pathname[len1-1] != '/')
+    strcat (pathname, "/");
+  strcat (pathname, name);
+  if (stat (pathname, &st))
+    return 0;
+  return S_ISDIR(st.st_mode);
+}
+#endif
+
 static grub_err_t
 grub_hostfs_dir (grub_device_t device, const char *path, 
                 int (*hook) (const char *filename, int dir))
@@ -48,7 +71,11 @@ grub_hostfs_dir (grub_device_t device, c
       if (! de)
        break;
 
+#ifdef DT_DIR
       hook (de->d_name, de->d_type == DT_DIR);
+#else
+      hook (de->d_name, is_dir(path, de->d_name));
+#endif
     }
 
   closedir (dir);
@@ -81,6 +108,7 @@ grub_hostfs_read (grub_file_t file, char
   FILE *f;
 
   f = (FILE *) file->data;
+  fseek (f, file->offset, SEEK_SET);
   int s= fread (buf, 1, len, f);
 
   return s;
@@ -101,6 +129,7 @@ static grub_err_t
 grub_hostfs_label (grub_device_t device __attribute ((unused)),
                   char **label __attribute ((unused)))
 {
+  *label = 0;
   return GRUB_ERR_NONE;
 }