1 files changed, 5 insertions, 3 deletions

diff --git a/ui-ssdiff.c b/ui-ssdiff.c
index b6dc5b0..af8bc9e 100644
--- a/ui-ssdiff.c
+++ b/ui-ssdiff.c
@@ -117,7 +117,7 @@ static char *replace_tabs(char *line)
         int n_tabs = 0;
         int i;
         char *result;
-        int result_len;
+        size_t result_len;
 
         if (linelen == 0) {
                 result = xmalloc(1);
@@ -136,10 +136,12 @@ static char *replace_tabs(char *line)
         for (;;) {
                 cur_buf = strchr(prev_buf, '\t');
                 if (!cur_buf) {
-                        strncat(result, prev_buf, result_len);
+                        linelen = strlen(result);
+                        strlcpy(&result[linelen], prev_buf, result_len - linelen + 1);
                         break;
                 } else {
-                        strncat(result, prev_buf, cur_buf - prev_buf);
+                        linelen = strlen(result);
+                        strlcpy(&result[linelen], prev_buf, cur_buf - prev_buf + 1);
                         linelen = strlen(result);
                         memset(&result[linelen], ' ', 8 - (linelen % 8));
                         result[linelen + 8 - (linelen % 8)] = '\0';