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, 4 insertions, 4 deletions

diff --git a/src/termcap.c b/src/termcap.c
index 9e081baa62e..7dc0d572888 100644
--- a/src/termcap.c
+++ b/src/termcap.c
@@ -162,7 +162,7 @@ tgetst1 (char *ptr, char **area)
   else
     ret = *area;
 
-  /* Copy the string value, stopping at null or colon.
+  /* Copy the string value, stopping at NUL or colon.
      Also process ^ and \ abbreviations.  */
   p = ptr;
   r = ret;
@@ -424,7 +424,7 @@ tgetent (char *bp, const char *name)
     return -1;
 
   buf.size = BUFSIZE;
-  /* Add 1 to size to ensure room for terminating null.  */
+  /* Add 1 to size to ensure room for terminating NUL.  */
   buf.beg = xmalloc (buf.size + 1);
   term = indirect ? indirect : (char *)name;
 
@@ -480,7 +480,7 @@ tgetent (char *bp, const char *name)
       *bp1 = '\0';
 
       /* Does this entry refer to another terminal type's entry?
-	 If something is found, copy it into heap and null-terminate it.  */
+	 If something is found, copy it into heap and NUL-terminate it.  */
       tc_search_point = find_capability (tc_search_point, "tc");
       term = tgetst1 (tc_search_point, 0);
     }
@@ -618,7 +618,7 @@ gobble_line (int fd, register struct termcap_buffer *bufp, char *append_end)
 	    {
 	      ptrdiff_t ptr_offset = bufp->ptr - buf;
 	      ptrdiff_t append_end_offset = append_end - buf;
-	      /* Add 1 to size to ensure room for terminating null.  */
+	      /* Add 1 to size to ensure room for terminating NUL.  */
 	      ptrdiff_t size = bufp->size + 1;
 	      bufp->beg = buf = xpalloc (buf, &size, 1, -1, 1);
 	      bufp->size = size - 1;