diff options
Diffstat (limited to 'src/buffer.h')
| -rw-r--r-- | src/buffer.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/buffer.h b/src/buffer.h index 8c64a24e804..3c91bdfe570 100644 --- a/src/buffer.h +++ b/src/buffer.h @@ -306,6 +306,11 @@ do \ } \ 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)) + /* Return the address of byte position N in current buffer. */ #define BYTE_POS_ADDR(n) \ |