be very careful in case of signed chars

1 files changed, 2 insertions, 2 deletions

diff --git a/src/lib/libc/stdlib/strtouq.c b/src/lib/libc/stdlib/strtouq.c
index 3ab2c232dd..b872cf56f7 100644
--- a/src/lib/libc/stdlib/strtouq.c
+++ b/src/lib/libc/stdlib/strtouq.c
@@ -64,7 +64,7 @@ strtouq(nptr, endptr, base)
          */
         s = nptr;
         do {
-                c = *s++;
+                c = (unsigned char) *s++;
         } while (isspace(c));
         if (c == '-') {
                 neg = 1;
@@ -85,7 +85,7 @@ strtouq(nptr, endptr, base)
 
         cutoff = UQUAD_MAX / (u_quad_t)base;
         cutlim = UQUAD_MAX % (u_quad_t)base;
-        for (acc = 0, any = 0;; c = *s++) {
+        for (acc = 0, any = 0;; c = (unsigned char) *s++) {
                 if (isdigit(c))
                         c -= '0';
                 else if (isalpha(c))