1 files changed, 8 insertions, 9 deletions

diff --git a/shell/msh.c b/shell/msh.c
index 41f4cc60d..d9dd3efb2 100644
--- a/shell/msh.c
+++ b/shell/msh.c
@@ -1191,23 +1191,22 @@ static int isassign(const char *s)
         unsigned char c;
         DBGPRINTF7(("ISASSIGN: enter, s=%s\n", s));
 
-        /* no isalpha() - we shouldn't use locale */
         c = *s;
-        if (c != '_'
-         && (unsigned)((c|0x20) - 'a') > 25 /* not letter */
-        ) {
+        /* no isalpha() - we shouldn't use locale */
+        /* c | 0x20 - lowercase (Latin) letters */
+        if (c != '_' && (unsigned)((c|0x20) - 'a') > 25)
+                /* not letter */
                 return 0;
-        }
+
         while (1) {
                 c = *++s;
-                if (c == '\0')
-                        return 0;
                 if (c == '=')
                         return 1;
-                c |= 0x20; /* lowercase letters, doesn't affect numbers */
+                if (c == '\0')
+                        return 0;
                 if (c != '_'
                  && (unsigned)(c - '0') > 9  /* not number */
-                 && (unsigned)(c - 'a') > 25 /* not letter */
+                 && (unsigned)((c|0x20) - 'a') > 25 /* not letter */
                 ) {
                         return 0;
                 }