fix all cases of strcpy on overlapping strings.

1 files changed, 9 insertions, 0 deletions

diff --git a/libbb/safe_strncpy.c b/libbb/safe_strncpy.c
index 649fa10cf..4acd9766b 100644
--- a/libbb/safe_strncpy.c
+++ b/libbb/safe_strncpy.c
@@ -16,3 +16,12 @@ char* FAST_FUNC safe_strncpy(char *dst, const char *src, size_t size)
         dst[--size] = '\0';
         return strncpy(dst, src, size);
 }
+
+/* Like strcpy but can copy overlapping strings. */
+void FAST_FUNC overlapping_strcpy(char *dst, const char *src)
+{
+        while ((*dst = *src) != '\0') {
+                dst++;
+                src++;
+        }
+}