[PATCH] Fix -Wchar-subscripts warnings

[Aschref Ben-Thabet]

From: Aschref Ben Thabet <aschref.ben-thabet at embedded-brains.de>

The argument to the ctype functions must be an int and the value of the
character must be representable as an unsigned char or equal to the
value of the macro EOF. If the argument has any other value, the
behavior is undefined.
---
 cpukit/libdl/rtl-archive.c                 | 4 ++--
 cpukit/libmisc/rtems-fdt/rtems-fdt-shell.c | 8 ++++----
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/cpukit/libdl/rtl-archive.c b/cpukit/libdl/rtl-archive.c
index eb7641b034..6eba1585b6 100644
--- a/cpukit/libdl/rtl-archive.c
+++ b/cpukit/libdl/rtl-archive.c
@@ -516,13 +516,13 @@ rtems_rtl_archives_load_config (rtems_rtl_archives* archives)
       {
         size_t ls = strlen (&s[r]);
         size_t b = 0;
-        while (b < ls && isspace (s[r + b]))
+        while (b < ls && isspace ((unsigned char) s[r + b]))
         {
           s[r + b] = '\0';
           ++b;
         }
         b = ls - 1;
-        while (b > 0 && isspace (s[r + b]))
+        while (b > 0 && isspace ((unsigned char) s[r + b]))
         {
           s[r + b] = '\0';
           --b;
diff --git a/cpukit/libmisc/rtems-fdt/rtems-fdt-shell.c b/cpukit/libmisc/rtems-fdt/rtems-fdt-shell.c
index b15103e53d..b0894c1d38 100644
--- a/cpukit/libmisc/rtems-fdt/rtems-fdt-shell.c
+++ b/cpukit/libmisc/rtems-fdt/rtems-fdt-shell.c
@@ -338,7 +338,7 @@ rtems_fdt_shell_set (int argc, char *argv[])
   if (!rtems_fdt_get_value32 (argv[1], "reg", sizeof (uint32_t), &address))
     return 1;
 
-  if (isdigit (argv[mask_arg][0]))
+  if (isdigit ((unsigned char) argv[mask_arg][0]))
     mask = strtoul (argv[mask_arg], 0, 0);
   else
   {
@@ -380,7 +380,7 @@ rtems_fdt_shell_cl (int argc, char *argv[])
   if (!rtems_fdt_get_value32 (argv[1], "reg", sizeof (uint32_t), &address))
     return 1;
 
-  if (isdigit (argv[mask_arg][0]))
+  if (isdigit ((unsigned char) argv[mask_arg][0]))
     mask = strtoul (argv[mask_arg], 0, 0);
   else
   {
@@ -426,7 +426,7 @@ rtems_fdt_shell_up (int argc, char *argv[])
   if (!rtems_fdt_get_value32 (argv[1], "reg", sizeof (uint32_t), &address))
     return 1;
 
-  if (isdigit (argv[mask_arg][0]))
+  if (isdigit ((unsigned char) argv[mask_arg][0]))
     mask = strtoul (argv[mask_arg], 0, 0);
   else
   {
@@ -473,7 +473,7 @@ rtems_fdt_shell_tst (int argc, char *argv[])
   if (!rtems_fdt_get_value32 (argv[1], "reg", sizeof (uint32_t), &address))
     return 1;
 
-  if (isdigit (argv[mask_arg][0]))
+  if (isdigit ((unsigned char) argv[mask_arg][0]))
     mask = strtoul (argv[mask_arg], 0, 0);
   else
   {
-- 
2.26.2