diff options
Diffstat (limited to 'src/buffer.h')
| -rw-r--r-- | src/buffer.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/src/buffer.h b/src/buffer.h index dc1d62beb00..a13351b5ea6 100644 --- a/src/buffer.h +++ b/src/buffer.h @@ -309,8 +309,10 @@ while (0) /* Maximum number of bytes in a buffer. A buffer cannot contain more bytes than a 1-origin fixnum can represent, - nor can it be so large that C pointer arithmetic stops working. */ -#define BUF_BYTES_MAX min (MOST_POSITIVE_FIXNUM - 1, min (SIZE_MAX, PTRDIFF_MAX)) + nor can it be so large that C pointer arithmetic stops working. + The ptrdiff_t cast ensures that this is signed, not unsigned. */ +#define BUF_BYTES_MAX \ + (ptrdiff_t) min (MOST_POSITIVE_FIXNUM - 1, min (SIZE_MAX, PTRDIFF_MAX)) /* Return the address of byte position N in current buffer. */ |