be very careful in case of signed chars

1 files changed, 2 insertions, 2 deletions

diff --git a/src/lib/libc/stdlib/strtoq.c b/src/lib/libc/stdlib/strtoq.c
index 003c020d71..0532f9f228 100644
--- a/src/lib/libc/stdlib/strtoq.c
+++ b/src/lib/libc/stdlib/strtoq.c
@@ -66,7 +66,7 @@ strtoq(nptr, endptr, base)
          */
         s = nptr;
         do {
-                c = *s++;
+                c = (unsigned char) *s++;
         } while (isspace(c));
         if (c == '-') {
                 neg = 1;
@@ -113,7 +113,7 @@ strtoq(nptr, endptr, base)
                 }
                 cutlim = -cutlim;
         }
-        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))