misc: null-terminate

Make use of this term consistently.

Closes #9527

docs/BUFREF.md

@@ -59,8 +59,8 @@ Releases the previously referenced buffer, then duplicates the `length`-byte
 `data` into a buffer allocated via `malloc()` and references the latter
 associated with destructor `curl_free()`.
 
-An additional trailing byte is allocated and set to zero as a possible
-string zero-terminator; it is not counted in the stored length.
+An additional trailing byte is allocated and set to zero as a possible string
+null-terminator; it is not counted in the stored length.
 
 Returns `CURLE_OK` if successful, else `CURLE_OUT_OF_MEMORY`.
 

docs/CODE_REVIEW.md

@@ -151,12 +151,12 @@ Maybe use of `realloc()` should rather use the dynbuf functions?
 Do not allow new code that grows buffers without using dynbuf.
 
 Use of C functions that rely on a terminating zero must only be used on data
-that really do have a zero terminating zero.
+that really do have a null-terminating zero.
 
 ## Dangerous "data styles"
 
 Make extra precautions and verify that memory buffers that need a terminating
-zero always have exactly that. Buffers *without* a zero terminator must not be
+zero always have exactly that. Buffers *without* a null-terminator must not be
 used as input to string functions.
 
 # Commit messages

docs/libcurl/curl_easy_header.3

@@ -37,7 +37,7 @@ CURLHcode curl_easy_header(CURL *easy,
 .SH DESCRIPTION
 \fIcurl_easy_header(3)\fP returns a pointer to a "curl_header" struct in
 \fBhout\fP with data for the HTTP response header \fIname\fP. The case
-insensitive nul-terminated header name should be specified without colon.
+insensitive null-terminated header name should be specified without colon.
 
 \fIindex\fP 0 means asking for the first instance of the header. If the
 returned header struct has \fBamount\fP set larger than 1, it means there are
@@ -94,7 +94,7 @@ but it might have a different case.
 
 The data \fBvalue\fP field points to, comes exactly as delivered over the
 network but with leading and trailing whitespace and newlines stripped
-off. The `value` data is nul-terminated. For legacy HTTP/1 "folded headers",
+off. The `value` data is null-terminated. For legacy HTTP/1 "folded headers",
 this API provides the full single value in an unfolded manner with a single
 whitespace between the lines.
 

docs/libcurl/curl_easy_option_next.3

@@ -33,7 +33,7 @@ typedef enum {
   CURLOT_VALUES,  /*      (a defined set or bitmask) */
   CURLOT_OFF_T,   /* curl_off_t (a range of values) */
   CURLOT_OBJECT,  /* pointer (void *) */
-  CURLOT_STRING,  /*         (char * to zero terminated buffer) */
+  CURLOT_STRING,  /*         (char * to null-terminated buffer) */
   CURLOT_SLIST,   /*         (struct curl_slist *) */
   CURLOT_CBPTR,   /*         (void * passed as-is to a callback) */
   CURLOT_BLOB,    /* blob (struct curl_blob *) */

docs/libcurl/opts/CURLOPT_POSTFIELDS.3

@@ -56,7 +56,7 @@ the POST data from the read callback. If you want to send a zero-byte POST set
 \fICURLOPT_POSTFIELDS(3)\fP to an empty string, or set \fICURLOPT_POST(3)\fP to
 1 and \fICURLOPT_POSTFIELDSIZE(3)\fP to 0.
 
-libcurl will use assume this option points to a nul-terminated string unless
+libcurl will use assume this option points to a null-terminated string unless
 you also set \fICURLOPT_POSTFIELDSIZE(3)\fP to specify the length of the
 provided data, which then is strictly required if you want to send off nul
 bytes included in the data.

docs/libcurl/opts/CURLOPT_PREREQFUNCTION.3

@@ -59,12 +59,12 @@ The callback function must return \fICURL_PREREQFUNC_OK\fP on success, or
 
 This function is passed the following arguments:
 .IP conn_primary_ip
-A nul-terminated pointer to a C string containing the primary IP of the remote
-server established with this connection. For FTP, this is the IP for the
-control connection. IPv6 addresses are represented without surrounding
+A null-terminated pointer to a C string containing the primary IP of the
+remote server established with this connection. For FTP, this is the IP for
+the control connection. IPv6 addresses are represented without surrounding
 brackets.
 .IP conn_local_ip
-A nul-terminated pointer to a C string containing the originating IP for this
+A null-terminated pointer to a C string containing the originating IP for this
 connection. IPv6 addresses are represented without surrounding brackets.
 .IP conn_primary_port
 The primary port number on the remote server established with this connection.