Fix misuses of NULL when talking about the NUL character

* lisp/subr.el (inhibit-null-byte-detection): Make it an obsolete alias.

* src/coding.c (setup_coding_system): Use new name.
(detect_coding): Rename null_byte_found => nul_byte_found.
(detect_coding_system): Use new name.
Rename null_byte_found => nul_byte_found.
(Fdefine_coding_system_internal): Use new name.
(syms_of_coding): Rename inhibit-null-byte-detection to
inhibit-nul-byte-detection.
* src/w16select.c (get_clipboard_data): null_char => nul_char.
* src/json.c (check_string_without_embedded_nuls): Rename from
check_string_without_embedded_nulls.
(Fjson_parse_string): Adjust accordingly.
* src/coding.h (enum define_coding_undecided_arg_index)
(enum coding_attr_index): ...null_byte... => ...nul_byte....
* lisp/info.el (info-insert-file-contents, Info-insert-dir):
* lisp/international/mule.el (define-coding-system):
* lisp/vc/vc-git.el (vc-git--call):
* doc/lispref/nonascii.texi (Lisp and Coding Systems): Use the new name.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/sysdep.c b/src/sysdep.c
index fe5a44ea2da..57ea8220cac 100644
--- a/src/sysdep.c
+++ b/src/sysdep.c
@@ -257,12 +257,12 @@ get_current_dir_name_or_unreachable (void)
 
   char *pwd;
 
-  /* The maximum size of a directory name, including the terminating null.
+  /* The maximum size of a directory name, including the terminating NUL.
      Leave room so that the caller can append a trailing slash.  */
   ptrdiff_t dirsize_max = min (PTRDIFF_MAX, SIZE_MAX) - 1;
 
   /* The maximum size of a buffer for a file name, including the
-     terminating null.  This is bounded by MAXPATHLEN, if available.  */
+     terminating NUL.  This is bounded by MAXPATHLEN, if available.  */
   ptrdiff_t bufsize_max = dirsize_max;
 #ifdef MAXPATHLEN
   bufsize_max = min (bufsize_max, MAXPATHLEN);
@@ -3435,7 +3435,7 @@ system_process_attributes (Lisp_Object pid)
 
       if (nread)
         {
-          /* We don't want trailing null characters.  */
+          /* We don't want trailing NUL characters.  */
           for (p = cmdline + nread; cmdline < p && !p[-1]; p--)
             continue;