1 files changed, 2 insertions, 2 deletions
diff --git a/byte.c b/byte.c
index 1ef014f..457d878 100644
--- a/byte.c
+++ b/byte.c
@@ -119,7 +119,7 @@ SCM scm_bytes_reverse(str)
   ASRTER(NIMP(str) && STRINGP(str), str, ARG1, s_bt_reverse);
   len = LENGTH(str);
   dst = CHARS(str);
-  for(k = len/2;k >= 0;k--) {
+  for(k = (len - 1)/2;k >= 0;k--) {
     int tmp = dst[k];
     dst[k] = dst[len - k - 1];
     dst[len - k - 1] = tmp;
@@ -187,7 +187,7 @@ SCM scm_substring_read(sstr, start, args)
   }
   else {
     long idx = start;
-    while (end <= idx) {
+    while (end < idx) {
       int chr = lgetc(port);
       if (EOF==chr) return MAKINUM(start - idx);
       CHARS(sstr)[--idx] = chr;