Prefer ptrdiff_t to int and avoid integer overflows.

* fileio.c (make_temp_name):
* font.c (font_parse_family_registry): Avoid integer
overflow on string size calculation.
* data.c (Faset): Likewise for byte index.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/data.c b/src/data.c
index 5aeb24b16dc..f02b4588ad0 100644
--- a/src/data.c
+++ b/src/data.c
@@ -2248,7 +2248,7 @@ bool-vector.  IDX starts at 0.  */)
         {
           if (! SINGLE_BYTE_CHAR_P (c))
             {
-              int i;
+              ptrdiff_t i;
 
               for (i = SBYTES (array) - 1; i >= 0; i--)
                 if (SREF (array, i) >= 0x80)