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-rw-r--r--libguile/srfi-13.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/libguile/srfi-13.c b/libguile/srfi-13.c
index 4e5d5725f..5c30dfe20 100644
--- a/libguile/srfi-13.c
+++ b/libguile/srfi-13.c
@@ -546,10 +546,17 @@ SCM_DEFINE (scm_string_copy_x, "string-copy!", 3, 2, 0,
SCM_ASSERT_RANGE (3, s, len <= scm_i_string_length (target) - ctstart);
target = scm_i_string_start_writing (target);
- for (i = 0; i < cend - cstart; i++)
+ if (ctstart < cstart)
{
- scm_i_string_set_x (target, ctstart + i,
- scm_i_string_ref (s, cstart + i));
+ for (i = 0; i < len; i++)
+ scm_i_string_set_x (target, ctstart + i,
+ scm_i_string_ref (s, cstart + i));
+ }
+ else
+ {
+ for (i = len; i--;)
+ scm_i_string_set_x (target, ctstart + i,
+ scm_i_string_ref (s, cstart + i));
}
scm_i_string_stop_writing ();
scm_remember_upto_here_1 (target);