diff -r 40bf3ffff484 tools/libfsimage/fat/fsys_fat.c
--- a/tools/libfsimage/fat/fsys_fat.c	Thu Sep 20 16:02:22 2007 +0100
+++ b/tools/libfsimage/fat/fsys_fat.c	Fri Sep 21 14:34:10 2007 +0000
@@ -301,7 +301,7 @@ fat_dir (fsi_file_t *ffi, char *dirname)
   /* if we have a real file (and we're not just printing possibilities),
      then this is where we want to exit */
   
-  if (!*dirname || isspace (*dirname))
+  if (!*dirname || isspace ((uint8_t)*dirname))
     {
       if (attrib & FAT_ATTRIB_DIR)
 	{
@@ -325,7 +325,7 @@ fat_dir (fsi_file_t *ffi, char *dirname)
   /* Directories don't have a file size */
   filemax = INT_MAX;
   
-  for (rest = dirname; (ch = *rest) && !isspace (ch) && ch != '/'; rest++);
+  for (rest = dirname; (ch = *rest) && !isspace ((uint8_t)ch) && ch != '/'; rest++);
   
   *rest = 0;
   
@@ -426,13 +426,13 @@ fat_dir (fsi_file_t *ffi, char *dirname)
       {
 	int i, j, c;
 	
-	for (i = 0; i < 8 && (c = filename[i] = tolower (dir_buf[i]))
-	       && !isspace (c); i++);
+	for (i = 0; i < 8 && (c = filename[i] = tolower ((uint8_t)dir_buf[i]))
+	       && !isspace ((uint8_t)c); i++);
 	
 	filename[i++] = '.';
 	
-	for (j = 0; j < 3 && (c = filename[i + j] = tolower (dir_buf[8 + j]))
-	       && !isspace (c); j++);
+	for (j = 0; j < 3 && (c = filename[i + j] = tolower ((uint8_t)dir_buf[8 + j]))
+	       && !isspace ((uint8_t)c); j++);
 	
 	if (j == 0)
 	  i--;
diff -r 40bf3ffff484 tools/libfsimage/iso9660/fsys_iso9660.c
--- a/tools/libfsimage/iso9660/fsys_iso9660.c	Thu Sep 20 16:02:22 2007 +0100
+++ b/tools/libfsimage/iso9660/fsys_iso9660.c	Fri Sep 21 14:34:10 2007 +0000
@@ -164,7 +164,7 @@ iso9660_dir (fsi_file_t *ffi, char *dirn
       /* pathlen = strcspn(dirname, "/\n\t "); */
       for (pathlen = 0 ;
 	   dirname[pathlen]
-	     && !isspace(dirname[pathlen]) && dirname[pathlen] != '/' ;
+	     && !isspace((uint8_t)dirname[pathlen]) && dirname[pathlen] != '/' ;
 	   pathlen++)
 	;
 
diff -r 40bf3ffff484 tools/libfsimage/reiserfs/fsys_reiserfs.c
--- a/tools/libfsimage/reiserfs/fsys_reiserfs.c	Thu Sep 20 16:02:22 2007 +0100
+++ b/tools/libfsimage/reiserfs/fsys_reiserfs.c	Fri Sep 21 14:34:10 2007 +0000
@@ -1029,7 +1029,7 @@ reiserfs_dir (fsi_file_t *ffi, char *dir
 
 	  /* Find out how long our remaining name is. */
 	  len = 0;
-	  while (dirname[len] && !isspace (dirname[len]))
+	  while (dirname[len] && !isspace ((uint8_t)dirname[len]))
 	    len++;
 
 	  if (filemax + len > sizeof (linkbuf) - 1)
@@ -1078,7 +1078,7 @@ reiserfs_dir (fsi_file_t *ffi, char *dir
       /* if we have a real file (and we're not just printing possibilities),
 	 then this is where we want to exit */
       
-      if (! *dirname || isspace (*dirname))
+      if (! *dirname || isspace ((uint8_t)*dirname))
 	{
 	  if (! S_ISREG (mode))
 	    {
@@ -1102,14 +1102,14 @@ reiserfs_dir (fsi_file_t *ffi, char *dir
 	}
       
       /* continue with the file/directory name interpretation */
-      while (*dirname == '/')
+      while ((uint8_t)*dirname == '/')
 	dirname++;
       if (! S_ISDIR (mode))
 	{
 	  errnum = ERR_BAD_FILETYPE;
 	  return 0;
 	}
-      for (rest = dirname; (ch = *rest) && ! isspace (ch) && ch != '/'; rest++);
+      for (rest = dirname; (ch = *rest) && ! isspace ((uint8_t)ch) && ch != '/'; rest++);
       *rest = 0;
       
 # ifndef STAGE1_5
diff -r 40bf3ffff484 tools/libfsimage/ufs/fsys_ufs.c
--- a/tools/libfsimage/ufs/fsys_ufs.c	Thu Sep 20 16:02:22 2007 +0100
+++ b/tools/libfsimage/ufs/fsys_ufs.c	Fri Sep 21 14:34:10 2007 +0000
@@ -72,13 +72,13 @@ ufs_dir(fsi_file_t *ffi, char *dirname)
 	while (*dirname == '/')
 		dirname++;
 
-	while (inode && *dirname && !isspace(*dirname)) {
+	while (inode && *dirname && !isspace((uint8_t)*dirname)) {
 		if (!openi(ffi, inode))
 			return 0;
 
 		/* parse for next path component */
 		fname = dirname;
-		while (*dirname && !isspace(*dirname) && *dirname != '/')
+		while (*dirname && !isspace((uint8_t)*dirname) && *dirname != '/')
 			dirname++;
 		ch = *dirname;
 		*dirname = 0;	/* ensure null termination */