1 files changed, 7 insertions, 7 deletions

diff --git a/src/lib/libc/net/base64.c b/src/lib/libc/net/base64.c
index d432c48d5c..78ef449a75 100644
--- a/src/lib/libc/net/base64.c
+++ b/src/lib/libc/net/base64.c
@@ -1,4 +1,4 @@
-/*      $OpenBSD: base64.c,v 1.5 2006/10/21 09:55:03 otto Exp $ */
+/*      $OpenBSD: base64.c,v 1.6 2013/11/24 23:51:28 deraadt Exp $      */
 
 /*
  * Copyright (c) 1996 by Internet Software Consortium.
@@ -199,7 +199,7 @@ b64_pton(src, target, targsize)
         state = 0;
         tarindex = 0;
 
-        while ((ch = *src++) != '\0') {
+        while ((ch = (unsigned char)*src++) != '\0') {
                 if (isspace(ch))        /* Skip whitespace anywhere. */
                         continue;
 
@@ -258,8 +258,8 @@ b64_pton(src, target, targsize)
          * on a byte boundary, and/or with erroneous trailing characters.
          */
 
-        if (ch == Pad64) {              /* We got a pad char. */
-                ch = *src++;            /* Skip it, get next. */
+        if (ch == Pad64) {                      /* We got a pad char. */
+                ch = (unsigned char)*src++;     /* Skip it, get next. */
                 switch (state) {
                 case 0:         /* Invalid = in first position */
                 case 1:         /* Invalid = in second position */
@@ -267,13 +267,13 @@ b64_pton(src, target, targsize)
 
                 case 2:         /* Valid, means one byte of info */
                         /* Skip any number of spaces. */
-                        for (; ch != '\0'; ch = *src++)
+                        for (; ch != '\0'; ch = (unsigned char)*src++)
                                 if (!isspace(ch))
                                         break;
                         /* Make sure there is another trailing = sign. */
                         if (ch != Pad64)
                                 return (-1);
-                        ch = *src++;            /* Skip the = */
+                        ch = (unsigned char)*src++;             /* Skip the = */
                         /* Fall through to "single trailing =" case. */
                         /* FALLTHROUGH */
 
@@ -282,7 +282,7 @@ b64_pton(src, target, targsize)
                          * We know this char is an =.  Is there anything but
                          * whitespace after it?
                          */
-                        for (; ch != '\0'; ch = *src++)
+                        for (; ch != '\0'; ch = (unsigned char)*src++)
                                 if (!isspace(ch))
                                         return (-1);