diff options
| -rw-r--r-- | src/fileio.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/fileio.c b/src/fileio.c index a26e8010f7f..0e6f8b3aff0 100644 --- a/src/fileio.c +++ b/src/fileio.c @@ -2607,6 +2607,8 @@ and (2) it puts less data in the undo list.") char buffer[1 << 14]; int same_at_start = BEGV; int same_at_end = ZV; + int overlap; + immediate_quit = 1; QUIT; /* Count how many chars at the start of the file @@ -2678,9 +2680,16 @@ and (2) it puts less data in the undo list.") break; } immediate_quit = 0; + + /* Don't try to reuse the same piece of text twice. */ + overlap = same_at_start - BEGV - (same_at_end + st.st_size - ZV); + if (overlap > 0) + same_at_end += overlap; + /* Arrange to read only the nonmatching middle part of the file. */ XFASTINT (beg) = same_at_start - BEGV; XFASTINT (end) = st.st_size - (ZV - same_at_end); + del_range_1 (same_at_start, same_at_end, 0); /* Insert from the file at the proper position. */ SET_PT (same_at_start); |