Check for buffer and string overflow more precisely.

* buffer.h (BUF_BYTES_MAX): New macro.
* lisp.h (STRING_BYTES_MAX): New macro.
* alloc.c (Fmake_string):
* character.c (string_escape_byte8):
* coding.c (coding_alloc_by_realloc):
* doprnt.c (doprnt):
* editfns.c (Fformat):
* eval.c (verror):
Use STRING_BYTES_MAX, not MOST_POSITIVE_FIXNUM,
since they may not be the same number.
* editfns.c (Finsert_char):
* fileio.c (Finsert_file_contents):
Likewise for BUF_BYTES_MAX.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/fileio.c b/src/fileio.c
index 2f7716d5b54..d9bc28d8c37 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -3248,7 +3248,7 @@ variable `last-coding-system-used' to the coding system actually used.  */)
   /* Check whether the size is too large or negative, which can happen on a
      platform that allows file sizes greater than the maximum off_t value.  */
   if (! not_regular
-      && ! (0 <= st.st_size && st.st_size <= MOST_POSITIVE_FIXNUM))
+      && ! (0 <= st.st_size && st.st_size <= BUF_BYTES_MAX))
     error ("Maximum buffer size exceeded");
 
   /* Prevent redisplay optimizations.  */