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/timefns.c b/src/timefns.c
index 5beeaf57a25..514fa24f8b9 100644
--- a/src/timefns.c
+++ b/src/timefns.c
@@ -1133,7 +1133,7 @@ or (if you need time as a string) `format-time-string'.  */)
    determine how many bytes would be written, use NULL for S and
    ((size_t) -1) for MAXSIZE.
 
-   This function behaves like nstrftime, except it allows null
+   This function behaves like nstrftime, except it allows NUL
    bytes in FORMAT and it does not support nanoseconds.  */
 static size_t
 emacs_nmemftime (char *s, size_t maxsize, const char *format,
@@ -1141,8 +1141,8 @@ emacs_nmemftime (char *s, size_t maxsize, const char *format,
 {
   size_t total = 0;
 
-  /* Loop through all the null-terminated strings in the format
-     argument.  Normally there's just one null-terminated string, but
+  /* Loop through all the NUL-terminated strings in the format
+     argument.  Normally there's just one NUL-terminated string, but
      there can be arbitrarily many, concatenated together, if the
      format contains '\0' bytes.  nstrftime stops at the first
      '\0' byte so we must invoke it separately for each such string.  */