terminology: call them null-terminated strings

Updated terminology in docs, comments and phrases to refer to C strings
as "null-terminated". Done to unify with how most other C oriented docs
refer of them and what users in general seem to prefer (based on a
single highly unscientific poll on twitter).

Reported-by: coinhubs on github
Fixes #5598
Closes #5608

83 files changed, 94 insertions, 94 deletions

diff --git a/docs/libcurl/curl_easy_escape.3 b/docs/libcurl/curl_easy_escape.3
index 2f9192e10..8311622bd 100644
--- a/docs/libcurl/curl_easy_escape.3
+++ b/docs/libcurl/curl_easy_escape.3
@@ -5,7 +5,7 @@
 .\" *                            | (__| |_| |  _ <| |___
 .\" *                             \___|\___/|_| \_\_____|
 .\" *
-.\" * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
 .\" *
 .\" * This software is licensed as described in the file COPYING, which
 .\" * you should have received as part of this distribution. The terms
@@ -51,7 +51,7 @@ to the function is encoded correctly.
 .SH AVAILABILITY
 Added in 7.15.4 and replaces the old \fIcurl_escape(3)\fP function.
 .SH RETURN VALUE
-A pointer to a zero terminated string or NULL if it failed.
+A pointer to a null-terminated string or NULL if it failed.
 .SH EXAMPLE
 .nf
 CURL *curl = curl_easy_init();
diff --git a/docs/libcurl/curl_easy_strerror.3 b/docs/libcurl/curl_easy_strerror.3
index 481dc4f88..b5bb0f2f2 100644
--- a/docs/libcurl/curl_easy_strerror.3
+++ b/docs/libcurl/curl_easy_strerror.3
@@ -35,6 +35,6 @@ specific error descriptions generated at run-time.
 .SH AVAILABILITY
 This function was added in libcurl 7.12.0
 .SH RETURN VALUE
-A pointer to a zero terminated string.
+A pointer to a null-terminated string.
 .SH "SEE ALSO"
 .BR libcurl-errors "(3), " curl_multi_strerror "(3), " curl_share_strerror "(3)"
diff --git a/docs/libcurl/curl_easy_unescape.3 b/docs/libcurl/curl_easy_unescape.3
index 50ce97db7..c5127f27e 100644
--- a/docs/libcurl/curl_easy_unescape.3
+++ b/docs/libcurl/curl_easy_unescape.3
@@ -5,7 +5,7 @@
 .\" *                            | (__| |_| |  _ <| |___
 .\" *                             \___|\___/|_| \_\_____|
 .\" *
-.\" * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
 .\" *
 .\" * This software is licensed as described in the file COPYING, which
 .\" * you should have received as part of this distribution. The terms
@@ -49,6 +49,6 @@ You must \fIcurl_free(3)\fP the returned string when you're done with it.
 .SH AVAILABILITY
 Added in 7.15.4 and replaces the old \fIcurl_unescape(3)\fP function.
 .SH RETURN VALUE
-A pointer to a zero terminated string or NULL if it failed.
+A pointer to a null-terminated string or NULL if it failed.
 .SH "SEE ALSO"
 .BR curl_easy_escape "(3), " curl_free "(3)," RFC 3986
diff --git a/docs/libcurl/curl_escape.3 b/docs/libcurl/curl_escape.3
index 3d7c1440d..ee5040943 100644
--- a/docs/libcurl/curl_escape.3
+++ b/docs/libcurl/curl_escape.3
@@ -43,6 +43,6 @@ You must \fIcurl_free(3)\fP the returned string when you're done with it.
 Since 7.15.4, \fIcurl_easy_escape(3)\fP should be used. This function will
 be removed in a future release.
 .SH RETURN VALUE
-A pointer to a zero terminated string or NULL if it failed.
+A pointer to a null-terminated string or NULL if it failed.
 .SH "SEE ALSO"
 .BR curl_unescape "(3), " curl_free "(3), " RFC 2396
diff --git a/docs/libcurl/curl_getenv.3 b/docs/libcurl/curl_getenv.3
index d488e3f55..d024a6009 100644
--- a/docs/libcurl/curl_getenv.3
+++ b/docs/libcurl/curl_getenv.3
@@ -38,7 +38,7 @@ This function will be removed from the public libcurl API in a near future. It
 will instead be made "available" by source code access only, and then as
 curlx_getenv().
 .SH RETURN VALUE
-A pointer to a zero terminated string or NULL if it failed to find the
+A pointer to a null-terminated string or NULL if it failed to find the
 specified name.
 .SH NOTE
 Under unix operating systems, there isn't any point in returning an allocated
diff --git a/docs/libcurl/curl_mime_data.3 b/docs/libcurl/curl_mime_data.3
index d2112f2d4..428156939 100644
--- a/docs/libcurl/curl_mime_data.3
+++ b/docs/libcurl/curl_mime_data.3
@@ -5,7 +5,7 @@
 .\" *                            | (__| |_| |  _ <| |___
 .\" *                             \___|\___/|_| \_\_____|
 .\" *
-.\" * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
 .\" *
 .\" * This software is licensed as described in the file COPYING, which
 .\" * you should have received as part of this distribution. The terms
@@ -34,7 +34,7 @@ curl_mime_data - set a mime part's body data from memory
 \fIdata\fP points to the data bytes: those are copied to the part and their
 storage may safely be reused after call.
 \fIdatasize\fP is the number of data bytes: it can be set to
-\fICURL_ZERO_TERMINATED\fP to indicate \fIdata\fP is a nul-terminated
+\fICURL_ZERO_TERMINATED\fP to indicate \fIdata\fP is a null-terminated
 character string.
 \fIpart\fP is the part's to assign contents to.
 
diff --git a/docs/libcurl/curl_mime_encoder.3 b/docs/libcurl/curl_mime_encoder.3
index c17cf25b3..0a2282c85 100644
--- a/docs/libcurl/curl_mime_encoder.3
+++ b/docs/libcurl/curl_mime_encoder.3
@@ -5,7 +5,7 @@
 .\" *                            | (__| |_| |  _ <| |___
 .\" *                             \___|\___/|_| \_\_____|
 .\" *
-.\" * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
 .\" *
 .\" * This software is licensed as described in the file COPYING, which
 .\" * you should have received as part of this distribution. The terms
@@ -33,7 +33,7 @@ curl_mime_encoder() requests a mime part's content to be encoded before being
 transmitted.
 
 \fIpart\fP is the part's handle to assign an encoder.
-\fIencoding\fP is a pointer to a zero-terminated encoding scheme. It may be
+\fIencoding\fP is a pointer to a null-terminated encoding scheme. It may be
 set to NULL to disable an encoder previously attached to the part. The encoding
 scheme storage may safely be reused after this function returns.
 
diff --git a/docs/libcurl/curl_mime_filedata.3 b/docs/libcurl/curl_mime_filedata.3
index e22b5810d..d29382fc4 100644
--- a/docs/libcurl/curl_mime_filedata.3
+++ b/docs/libcurl/curl_mime_filedata.3
@@ -5,7 +5,7 @@
 .\" *                            | (__| |_| |  _ <| |___
 .\" *                             \___|\___/|_| \_\_____|
 .\" *
-.\" * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
 .\" *
 .\" * This software is licensed as described in the file COPYING, which
 .\" * you should have received as part of this distribution. The terms
@@ -35,9 +35,9 @@ data to a mime part.
 
 \fIpart\fP is the part's to assign contents to.
 
-\fIfilename\fP points to the nul-terminated file's path name. The pointer can
-be NULL to detach the previous part contents settings.  Filename storage can be
-safely be reused after this call.
+\fIfilename\fP points to the null-terminated file's path name. The pointer can
+be NULL to detach the previous part contents settings.  Filename storage can
+be safely be reused after this call.
 
 As a side effect, the part's remote file name is set to the base name of the
 given \fIfilename\fP if it is a valid named file. This can be undone or
diff --git a/docs/libcurl/curl_mime_filename.3 b/docs/libcurl/curl_mime_filename.3
index 42916e598..20139d256 100644
--- a/docs/libcurl/curl_mime_filename.3
+++ b/docs/libcurl/curl_mime_filename.3
@@ -5,7 +5,7 @@
 .\" *                            | (__| |_| |  _ <| |___
 .\" *                             \___|\___/|_| \_\_____|
 .\" *
-.\" * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
 .\" *
 .\" * This software is licensed as described in the file COPYING, which
 .\" * you should have received as part of this distribution. The terms
@@ -36,8 +36,8 @@ associated Content-Disposition generated header.
 
 \fIpart\fP is the part's handle to assign the remote file name to.
 
-\fIfilename\fP points to the nul-terminated file name string; it may be set to
-NULL to remove a previously attached remote file name.
+\fIfilename\fP points to the null-terminated file name string; it may be set
+to NULL to remove a previously attached remote file name.
 
 The remote file name string is copied into the part, thus the associated
 storage may safely be released or reused after call. Setting a part's file
diff --git a/docs/libcurl/curl_mime_name.3 b/docs/libcurl/curl_mime_name.3
index f821d9082..24163ed1e 100644
--- a/docs/libcurl/curl_mime_name.3
+++ b/docs/libcurl/curl_mime_name.3
@@ -5,7 +5,7 @@
 .\" *                            | (__| |_| |  _ <| |___
 .\" *                             \___|\___/|_| \_\_____|
 .\" *
-.\" * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
 .\" *
 .\" * This software is licensed as described in the file COPYING, which
 .\" * you should have received as part of this distribution. The terms
@@ -33,7 +33,7 @@ fields are named.
 
 \fIpart\fP is the part's handle to assign a name to.
 
-\fIname\fP points to the zero-terminated name string.
+\fIname\fP points to the null-terminated name string.
 
 The name string is copied into the part, thus the associated storage may
 safely be released or reused after call. Setting a part's name twice is valid:
diff --git a/docs/libcurl/curl_mime_type.3 b/docs/libcurl/curl_mime_type.3
index e45922344..9075c36ed 100644
--- a/docs/libcurl/curl_mime_type.3
+++ b/docs/libcurl/curl_mime_type.3
@@ -33,7 +33,7 @@ curl_mime_type - set a mime part's content type
 
 \fIpart\fP is the part's handle to assign the content type to.
 
-\fImimetype\fP points to the nul-terminated file mime type string; it may be
+\fImimetype\fP points to the null-terminated file mime type string; it may be
 set to NULL to remove a previously attached mime type.
 
 The mime type string is copied into the part, thus the associated storage may
diff --git a/docs/libcurl/curl_multi_strerror.3 b/docs/libcurl/curl_multi_strerror.3
index bdcc5d590..fe0b2d7c2 100644
--- a/docs/libcurl/curl_multi_strerror.3
+++ b/docs/libcurl/curl_multi_strerror.3
@@ -32,6 +32,6 @@ error code passed in the argument \fIerrornum\fP.
 .SH AVAILABILITY
 This function was added in libcurl 7.12.0
 .SH RETURN VALUE
-A pointer to a zero terminated string.
+A pointer to a null-terminated string.
 .SH "SEE ALSO"
 .BR libcurl-errors "(3), " curl_easy_strerror "(3), " curl_share_strerror "(3)"
diff --git a/docs/libcurl/curl_share_strerror.3 b/docs/libcurl/curl_share_strerror.3
index eb48adfd1..34568a94b 100644
--- a/docs/libcurl/curl_share_strerror.3
+++ b/docs/libcurl/curl_share_strerror.3
@@ -32,6 +32,6 @@ error code passed in the argument \fIerrornum\fP.
 .SH AVAILABILITY
 This function was added in libcurl 7.12.0
 .SH RETURN VALUE
-A pointer to a zero terminated string.
+A pointer to a null-terminated string.
 .SH "SEE ALSO"
 .BR libcurl-errors "(3), " curl_multi_strerror "(3), " curl_easy_strerror "(3)"
diff --git a/docs/libcurl/curl_unescape.3 b/docs/libcurl/curl_unescape.3
index 7eefc69a3..e28ae1c83 100644
--- a/docs/libcurl/curl_unescape.3
+++ b/docs/libcurl/curl_unescape.3
@@ -43,6 +43,6 @@ You must \fIcurl_free(3)\fP the returned string when you're done with it.
 Since 7.15.4, \fIcurl_easy_unescape(3)\fP should be used. This function will
 be removed in a future release.
 .SH RETURN VALUE
-A pointer to a zero terminated string or NULL if it failed.
+A pointer to a null-terminated string or NULL if it failed.
 .SH "SEE ALSO"
 .br curl_easy_escape "(3)," curl_easy_unescape "(3)," curl_free "(3)," RFC 2396
diff --git a/docs/libcurl/curl_url_set.3 b/docs/libcurl/curl_url_set.3
index 630ab20eb..a0cb1f642 100644
--- a/docs/libcurl/curl_url_set.3
+++ b/docs/libcurl/curl_url_set.3
@@ -35,7 +35,7 @@ Given the \fIurl\fP handle of an already parsed URL, this function lets the
 user set/update individual pieces of it.
 
 The \fIpart\fP argument should identify the particular URL part (see list
-below) to set or change, with \fIcontent\fP pointing to a zero terminated
+below) to set or change, with \fIcontent\fP pointing to a null-terminated
 string with the new contents for that URL part. The contents should be in the
 form and encoding they'd use in a URL: URL encoded.
 
@@ -51,7 +51,7 @@ populated with a URL, the new URL can be relative to the previous.
 When successfully setting a new URL, relative or absolute, the handle contents
 will be replaced with the information of the newly set URL.
 
-Pass a pointer to a zero terminated string to the \fIurl\fP parameter. The
+Pass a pointer to a null-terminated string to the \fIurl\fP parameter. The
 string must point to a correctly formatted "RFC 3986+" URL or be a NULL
 pointer.
 .IP CURLUPART_SCHEME
diff --git a/docs/libcurl/curl_version.3 b/docs/libcurl/curl_version.3
index a40e1aeec..c9b2d4579 100644
--- a/docs/libcurl/curl_version.3
+++ b/docs/libcurl/curl_version.3
@@ -33,7 +33,7 @@ its important components (like OpenSSL version).
 
 We recommend using \fIcurl_version_info(3)\fP instead!
 .SH RETURN VALUE
-A pointer to a zero terminated string. The string resides in a statically
+A pointer to a null-terminated string. The string resides in a statically
 allocated buffer and must not be freed by the caller.
 .SH "SEE ALSO"
 .BR curl_version_info "(3)"
diff --git a/docs/libcurl/opts/CURLINFO_LOCAL_IP.3 b/docs/libcurl/opts/CURLINFO_LOCAL_IP.3
index e342fd2b3..2b44d9ab1 100644
--- a/docs/libcurl/opts/CURLINFO_LOCAL_IP.3
+++ b/docs/libcurl/opts/CURLINFO_LOCAL_IP.3
@@ -28,7 +28,7 @@ CURLINFO_LOCAL_IP \- get local IP address of last connection
 
 CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_LOCAL_IP, char **ip);
 .SH DESCRIPTION
-Pass a pointer to a char pointer to receive the pointer to a zero-terminated
+Pass a pointer to a char pointer to receive the pointer to a null-terminated
 string holding the IP address of the local end of most recent connection done
 with this \fBcurl\fP handle. This string may be IPv6 when that is
 enabled. Note that you get a pointer to a memory area that will be re-used at
diff --git a/docs/libcurl/opts/CURLINFO_PRIMARY_IP.3 b/docs/libcurl/opts/CURLINFO_PRIMARY_IP.3
index ec859d5d5..05256d8ea 100644
--- a/docs/libcurl/opts/CURLINFO_PRIMARY_IP.3
+++ b/docs/libcurl/opts/CURLINFO_PRIMARY_IP.3
@@ -28,7 +28,7 @@ CURLINFO_PRIMARY_IP \- get IP address of last connection
 
 CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_PRIMARY_IP, char **ip);
 .SH DESCRIPTION
-Pass a pointer to a char pointer to receive the pointer to a zero-terminated
+Pass a pointer to a char pointer to receive the pointer to a null-terminated
 string holding the IP address of the most recent connection done with this
 \fBcurl\fP handle. This string may be IPv6 when that is enabled. Note that you
 get a pointer to a memory area that will be re-used at next request so you
diff --git a/docs/libcurl/opts/CURLINFO_SCHEME.3 b/docs/libcurl/opts/CURLINFO_SCHEME.3
index f89b4ae9f..8fe0c781f 100644
--- a/docs/libcurl/opts/CURLINFO_SCHEME.3
+++ b/docs/libcurl/opts/CURLINFO_SCHEME.3
@@ -28,7 +28,7 @@ CURLINFO_SCHEME \- get the URL scheme (sometimes called protocol) used in the co
 
 CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_SCHEME, char **scheme);
 .SH DESCRIPTION
-Pass a pointer to a char pointer to receive the pointer to a zero-terminated
+Pass a pointer to a char pointer to receive the pointer to a null-terminated
 string holding the URL scheme used for the most recent connection done with
 this CURL \fBhandle\fP.
 
diff --git a/docs/libcurl/opts/CURLOPT_ABSTRACT_UNIX_SOCKET.3 b/docs/libcurl/opts/CURLOPT_ABSTRACT_UNIX_SOCKET.3
index 8b61854c0..5b5d52085 100644
--- a/docs/libcurl/opts/CURLOPT_ABSTRACT_UNIX_SOCKET.3
+++ b/docs/libcurl/opts/CURLOPT_ABSTRACT_UNIX_SOCKET.3
@@ -29,7 +29,7 @@ CURLOPT_ABSTRACT_UNIX_SOCKET \- set an abstract Unix domain socket
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_ABSTRACT_UNIX_SOCKET, char *path);
 .SH DESCRIPTION
 Enables the use of an abstract Unix domain socket instead of establishing a TCP
-connection to a host. The parameter should be a char * to a zero terminated string
+connection to a host. The parameter should be a char * to a null-terminated string
 holding the path of the socket. The path will be set to \fIpath\fP prefixed by a
 NULL byte (this is the convention for abstract sockets, however it should be stressed
 that the path passed to this function should not contain a leading NULL).
diff --git a/docs/libcurl/opts/CURLOPT_CAINFO.3 b/docs/libcurl/opts/CURLOPT_CAINFO.3
index e253eb529..2821ded8b 100644
--- a/docs/libcurl/opts/CURLOPT_CAINFO.3
+++ b/docs/libcurl/opts/CURLOPT_CAINFO.3
@@ -28,7 +28,7 @@ CURLOPT_CAINFO \- path to Certificate Authority (CA) bundle
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CAINFO, char *path);
 .SH DESCRIPTION
-Pass a char * to a zero terminated string naming a file holding one or more
+Pass a char * to a null-terminated string naming a file holding one or more
 certificates to verify the peer with.
 
 If \fICURLOPT_SSL_VERIFYPEER(3)\fP is zero and you avoid verifying the
diff --git a/docs/libcurl/opts/CURLOPT_CAPATH.3 b/docs/libcurl/opts/CURLOPT_CAPATH.3
index b648cc771..6fa705bf5 100644
--- a/docs/libcurl/opts/CURLOPT_CAPATH.3
+++ b/docs/libcurl/opts/CURLOPT_CAPATH.3
@@ -28,7 +28,7 @@ CURLOPT_CAPATH \- specify directory holding CA certificates
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CAPATH, char *capath);
 .SH DESCRIPTION
-Pass a char * to a zero terminated string naming a directory holding multiple
+Pass a char * to a null-terminated string naming a directory holding multiple
 CA certificates to verify the peer with. If libcurl is built against OpenSSL,
 the certificate directory must be prepared using the openssl c_rehash utility.
 This makes sense only when used in combination with the
diff --git a/docs/libcurl/opts/CURLOPT_COOKIE.3 b/docs/libcurl/opts/CURLOPT_COOKIE.3
index 5aa8cd58a..19b356d72 100644
--- a/docs/libcurl/opts/CURLOPT_COOKIE.3
+++ b/docs/libcurl/opts/CURLOPT_COOKIE.3
@@ -28,7 +28,7 @@ CURLOPT_COOKIE \- set contents of HTTP Cookie header
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_COOKIE, char *cookie);
 .SH DESCRIPTION
-Pass a pointer to a zero terminated string as parameter. It will be used to
+Pass a pointer to a null-terminated string as parameter. It will be used to
 set a cookie in the HTTP request. The format of the string should be
 NAME=CONTENTS, where NAME is the cookie name and CONTENTS is what the cookie
 should contain.
diff --git a/docs/libcurl/opts/CURLOPT_COOKIEFILE.3 b/docs/libcurl/opts/CURLOPT_COOKIEFILE.3
index f327ec148..37ebb24a8 100644
--- a/docs/libcurl/opts/CURLOPT_COOKIEFILE.3
+++ b/docs/libcurl/opts/CURLOPT_COOKIEFILE.3
@@ -28,7 +28,7 @@ CURLOPT_COOKIEFILE \- file name to read cookies from
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_COOKIEFILE, char *filename);
 .SH DESCRIPTION
-Pass a pointer to a zero terminated string as parameter. It should point to
+Pass a pointer to a null-terminated string as parameter. It should point to
 the file name of your file holding cookie data to read. The cookie data can be
 in either the old Netscape / Mozilla cookie data format or just regular HTTP
 headers (Set-Cookie style) dumped to a file.
diff --git a/docs/libcurl/opts/CURLOPT_COOKIEJAR.3 b/docs/libcurl/opts/CURLOPT_COOKIEJAR.3
index d4f7ccdad..c4fb72cf1 100644
--- a/docs/libcurl/opts/CURLOPT_COOKIEJAR.3
+++ b/docs/libcurl/opts/CURLOPT_COOKIEJAR.3
@@ -28,7 +28,7 @@ CURLOPT_COOKIEJAR \- file name to store cookies to
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_COOKIEJAR, char *filename);
 .SH DESCRIPTION
-Pass a \fIfilename\fP as char *, zero terminated. This will make libcurl write
+Pass a \fIfilename\fP as char *, null-terminated. This will make libcurl write
 all internally known cookies to the specified file when
 \fIcurl_easy_cleanup(3)\fP is called. If no cookies are known, no file will be
 created. Specify "-" as filename to instead have the cookies written to
diff --git a/docs/libcurl/opts/CURLOPT_COPYPOSTFIELDS.3 b/docs/libcurl/opts/CURLOPT_COPYPOSTFIELDS.3
index a2c1b11ec..ddf1eef3c 100644
--- a/docs/libcurl/opts/CURLOPT_COPYPOSTFIELDS.3
+++ b/docs/libcurl/opts/CURLOPT_COPYPOSTFIELDS.3
@@ -36,7 +36,7 @@ to overwrite the original data after setting this option.
 Because data are copied, care must be taken when using this option in
 conjunction with \fICURLOPT_POSTFIELDSIZE(3)\fP or
 \fICURLOPT_POSTFIELDSIZE_LARGE(3)\fP: If the size has not been set prior to
-\fICURLOPT_COPYPOSTFIELDS(3)\fP, the data is assumed to be a zero terminated
+\fICURLOPT_COPYPOSTFIELDS(3)\fP, the data is assumed to be a null-terminated
 string; else the stored size informs the library about the byte count to
 copy. In any case, the size must not be changed after
 \fICURLOPT_COPYPOSTFIELDS(3)\fP, unless another \fICURLOPT_POSTFIELDS(3)\fP or
diff --git a/docs/libcurl/opts/CURLOPT_CRLFILE.3 b/docs/libcurl/opts/CURLOPT_CRLFILE.3
index 648fb61e5..56fc56915 100644
--- a/docs/libcurl/opts/CURLOPT_CRLFILE.3
+++ b/docs/libcurl/opts/CURLOPT_CRLFILE.3
@@ -28,7 +28,7 @@ CURLOPT_CRLFILE \- specify a Certificate Revocation List file
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CRLFILE, char *file);
 .SH DESCRIPTION
-Pass a char * to a zero terminated string naming a \fIfile\fP with the
+Pass a char * to a null-terminated string naming a \fIfile\fP with the
 concatenation of CRL (in PEM format) to use in the certificate validation that
 occurs during the SSL exchange.
 
diff --git a/docs/libcurl/opts/CURLOPT_CUSTOMREQUEST.3 b/docs/libcurl/opts/CURLOPT_CUSTOMREQUEST.3
index 3008dcde6..4d21a7ae0 100644
--- a/docs/libcurl/opts/CURLOPT_CUSTOMREQUEST.3
+++ b/docs/libcurl/opts/CURLOPT_CUSTOMREQUEST.3
@@ -28,7 +28,7 @@ CURLOPT_CUSTOMREQUEST \- custom string for request
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CUSTOMREQUEST, char *request);
 .SH DESCRIPTION
-Pass a pointer to a zero terminated string as parameter.
+Pass a pointer to a null-terminated string as parameter.
 
 When you change the request method by setting \fICURLOPT_CUSTOMREQUEST(3)\fP
 to something, you don't actually change how libcurl behaves or acts in regards
diff --git a/docs/libcurl/opts/CURLOPT_DEBUGFUNCTION.3 b/docs/libcurl/opts/CURLOPT_DEBUGFUNCTION.3
index 2340b9bb6..0930bf8c8 100644
--- a/docs/libcurl/opts/CURLOPT_DEBUGFUNCTION.3
+++ b/docs/libcurl/opts/CURLOPT_DEBUGFUNCTION.3
@@ -54,7 +54,7 @@ shown above.
 \fICURLOPT_VERBOSE(3)\fP is in effect. This callback receives debug
 information, as specified in the \fItype\fP argument. This function must
 return 0. The \fIdata\fP pointed to by the char * passed to this function WILL
-NOT be zero terminated, but will be exactly of the \fIsize\fP as told by the
+NOT be null-terminated, but will be exactly of the \fIsize\fP as told by the
 \fIsize\fP argument.
 
 The \fIuserptr\fP argument is the pointer set with \fICURLOPT_DEBUGDATA(3)\fP.
diff --git a/docs/libcurl/opts/CURLOPT_DOH_URL.3 b/docs/libcurl/opts/CURLOPT_DOH_URL.3
index 407b92e20..b3ac1c5d0 100644
--- a/docs/libcurl/opts/CURLOPT_DOH_URL.3
+++ b/docs/libcurl/opts/CURLOPT_DOH_URL.3
@@ -29,7 +29,7 @@ CURLOPT_DOH_URL \- provide the DNS-over-HTTPS URL
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DOH_URL, char *URL);
 .SH DESCRIPTION
 Pass in a pointer to a \fIURL\fP for the DOH server to use for name
-resolving. The parameter should be a char * to a zero terminated string which
+resolving. The parameter should be a char * to a null-terminated string which
 must be URL-encoded in the following format: "https://host:port/path". It MUST
 specify a HTTPS URL.
 
diff --git a/docs/libcurl/opts/CURLOPT_EGDSOCKET.3 b/docs/libcurl/opts/CURLOPT_EGDSOCKET.3
index 8a2c1a603..0527928f2 100644
--- a/docs/libcurl/opts/CURLOPT_EGDSOCKET.3
+++ b/docs/libcurl/opts/CURLOPT_EGDSOCKET.3
@@ -28,7 +28,7 @@ CURLOPT_EGDSOCKET \- set EGD socket path
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_EGDSOCKET, char *path);
 .SH DESCRIPTION
-Pass a char * to the zero terminated path name to the Entropy Gathering Daemon
+Pass a char * to the null-terminated path name to the Entropy Gathering Daemon
 socket. It will be used to seed the random engine for SSL.
 
 The application does not have to keep the string around after setting this
diff --git a/docs/libcurl/opts/CURLOPT_FTPPORT.3 b/docs/libcurl/opts/CURLOPT_FTPPORT.3
index e150a5b29..0fcbaecd7 100644
--- a/docs/libcurl/opts/CURLOPT_FTPPORT.3
+++ b/docs/libcurl/opts/CURLOPT_FTPPORT.3
@@ -28,7 +28,7 @@ CURLOPT_FTPPORT \- make FTP transfer active
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTPPORT, char *spec);
 .SH DESCRIPTION
-Pass a pointer to a zero terminated string as parameter. It specifies that the
+Pass a pointer to a null-terminated string as parameter. It specifies that the
 FTP transfer will be made actively and the given string will be used to get
 the IP address to use for the FTP PORT instruction.
 
diff --git a/docs/libcurl/opts/CURLOPT_FTP_ACCOUNT.3 b/docs/libcurl/opts/CURLOPT_FTP_ACCOUNT.3
index 8218038a1..70b4c35bc 100644
--- a/docs/libcurl/opts/CURLOPT_FTP_ACCOUNT.3
+++ b/docs/libcurl/opts/CURLOPT_FTP_ACCOUNT.3
@@ -28,7 +28,7 @@ CURLOPT_FTP_ACCOUNT \- set account info for FTP
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTP_ACCOUNT, char *account);
 .SH DESCRIPTION
-Pass a pointer to a zero terminated string (or NULL to disable). When an FTP
+Pass a pointer to a null-terminated string (or NULL to disable). When an FTP
 server asks for "account data" after user name and password has been provided,
 this data is sent off using the ACCT command.
 
diff --git a/docs/libcurl/opts/CURLOPT_HEADERFUNCTION.3 b/docs/libcurl/opts/CURLOPT_HEADERFUNCTION.3
index 1cab96ebd..c800efb67 100644
--- a/docs/libcurl/opts/CURLOPT_HEADERFUNCTION.3
+++ b/docs/libcurl/opts/CURLOPT_HEADERFUNCTION.3
@@ -41,7 +41,7 @@ data. The header callback will be called once for each header and only
 complete header lines are passed on to the callback. Parsing headers is very
 easy using this. \fIbuffer\fP points to the delivered data, and the size of
 that data is \fInitems\fP; \fIsize\fP is always 1. Do not assume that the
-header line is zero terminated!
+header line is null-terminated!
 
 The pointer named \fIuserdata\fP is the one you set with the
 \fICURLOPT_HEADERDATA(3)\fP option.
diff --git a/docs/libcurl/opts/CURLOPT_ISSUERCERT.3 b/docs/libcurl/opts/CURLOPT_ISSUERCERT.3
index 8c5d70faf..0e6eef490 100644
--- a/docs/libcurl/opts/CURLOPT_ISSUERCERT.3
+++ b/docs/libcurl/opts/CURLOPT_ISSUERCERT.3
@@ -28,7 +28,7 @@ CURLOPT_ISSUERCERT \- issuer SSL certificate filename
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_ISSUERCERT, char *file);
 .SH DESCRIPTION
-Pass a char * to a zero terminated string naming a \fIfile\fP holding a CA
+Pass a char * to a null-terminated string naming a \fIfile\fP holding a CA
 certificate in PEM format. If the option is set, an additional check against
 the peer certificate is performed to verify the issuer is indeed the one
 associated with the certificate provided by the option. This additional check
diff --git a/docs/libcurl/opts/CURLOPT_KEYPASSWD.3 b/docs/libcurl/opts/CURLOPT_KEYPASSWD.3
index ea3212144..82427e17d 100644
--- a/docs/libcurl/opts/CURLOPT_KEYPASSWD.3
+++ b/docs/libcurl/opts/CURLOPT_KEYPASSWD.3
@@ -28,7 +28,7 @@ CURLOPT_KEYPASSWD \- set passphrase to private key
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_KEYPASSWD, char *pwd);
 .SH DESCRIPTION
-Pass a pointer to a zero terminated string as parameter. It will be used as
+Pass a pointer to a null-terminated string as parameter. It will be used as
 the password required to use the \fICURLOPT_SSLKEY(3)\fP or
 \fICURLOPT_SSH_PRIVATE_KEYFILE(3)\fP private key.  You never needed a pass
 phrase to load a certificate but you need one to load your private key.
diff --git a/docs/libcurl/opts/CURLOPT_LOGIN_OPTIONS.3 b/docs/libcurl/opts/CURLOPT_LOGIN_OPTIONS.3
index 9b690341c..3081103e0 100644
--- a/docs/libcurl/opts/CURLOPT_LOGIN_OPTIONS.3
+++ b/docs/libcurl/opts/CURLOPT_LOGIN_OPTIONS.3
@@ -28,7 +28,7 @@ CURLOPT_LOGIN_OPTIONS \- set login options
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_LOGIN_OPTIONS, char *options);
 .SH DESCRIPTION
-Pass a char * as parameter, which should be pointing to the zero terminated
+Pass a char * as parameter, which should be pointing to the null-terminated
 \fIoptions\fP string to use for the transfer.
 
 For more information about the login options please see RFC2384, RFC5092 and
diff --git a/docs/libcurl/opts/CURLOPT_MAIL_AUTH.3 b/docs/libcurl/opts/CURLOPT_MAIL_AUTH.3
index 6aa4d604d..71b11be02 100644
--- a/docs/libcurl/opts/CURLOPT_MAIL_AUTH.3
+++ b/docs/libcurl/opts/CURLOPT_MAIL_AUTH.3
@@ -28,7 +28,7 @@ CURLOPT_MAIL_AUTH \- SMTP authentication address
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_MAIL_AUTH, char *auth);
 .SH DESCRIPTION
-Pass a pointer to a zero terminated string as parameter. This will be used to
+Pass a pointer to a null-terminated string as parameter. This will be used to
 specify the authentication address (identity) of a submitted message that is
 being relayed to another server.
 
diff --git a/docs/libcurl/opts/CURLOPT_MAIL_FROM.3 b/docs/libcurl/opts/CURLOPT_MAIL_FROM.3
index 2963c2731..2628505d9 100644
--- a/docs/libcurl/opts/CURLOPT_MAIL_FROM.3
+++ b/docs/libcurl/opts/CURLOPT_MAIL_FROM.3
@@ -28,7 +28,7 @@ CURLOPT_MAIL_FROM \- SMTP sender address
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_MAIL_FROM, char *from);
 .SH DESCRIPTION
-Pass a pointer to a zero terminated string as parameter. This should be used
+Pass a pointer to a null-terminated string as parameter. This should be used
 to specify the sender's email address when sending SMTP mail with libcurl.
 
 An originator email address should be specified with angled brackets (<>)
diff --git a/docs/libcurl/opts/CURLOPT_NETRC_FILE.3 b/docs/libcurl/opts/CURLOPT_NETRC_FILE.3
index 8cb29f534..48dea5dab 100644
--- a/docs/libcurl/opts/CURLOPT_NETRC_FILE.3
+++ b/docs/libcurl/opts/CURLOPT_NETRC_FILE.3
@@ -28,7 +28,7 @@ CURLOPT_NETRC_FILE \- file name to read .netrc info from
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_NETRC_FILE, char *file);
 .SH DESCRIPTION
-Pass a char * as parameter, pointing to a zero terminated string containing
+Pass a char * as parameter, pointing to a null-terminated string containing
 the full path name to the \fIfile\fP you want libcurl to use as .netrc
 file. If this option is omitted, and \fICURLOPT_NETRC(3)\fP is set, libcurl
 will attempt to find a .netrc file in the current user's home
diff --git a/docs/libcurl/opts/CURLOPT_NOPROXY.3 b/docs/libcurl/opts/CURLOPT_NOPROXY.3
index 0d3ce229c..495fad6fd 100644
--- a/docs/libcurl/opts/CURLOPT_NOPROXY.3
+++ b/docs/libcurl/opts/CURLOPT_NOPROXY.3
@@ -28,7 +28,7 @@ CURLOPT_NOPROXY \- disable proxy use for specific hosts
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_NOPROXY, char *noproxy);
 .SH DESCRIPTION
-Pass a pointer to a zero terminated string. The string consists of a comma
+Pass a pointer to a null-terminated string. The string consists of a comma
 separated list of host names that do not require a proxy to get reached, even
 if one is specified.  The only wildcard available is a single * character,
 which matches all hosts, and effectively disables the proxy. Each name in this
diff --git a/docs/libcurl/opts/CURLOPT_PASSWORD.3 b/docs/libcurl/opts/CURLOPT_PASSWORD.3
index b3b09a26b..b1ddcaed5 100644
--- a/docs/libcurl/opts/CURLOPT_PASSWORD.3
+++ b/docs/libcurl/opts/CURLOPT_PASSWORD.3
@@ -28,7 +28,7 @@ CURLOPT_PASSWORD \- password to use in authentication
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PASSWORD, char *pwd);
 .SH DESCRIPTION
-Pass a char * as parameter, which should be pointing to the zero terminated
+Pass a char * as parameter, which should be pointing to the null-terminated
 password to use for the transfer.
 
 The \fICURLOPT_PASSWORD(3)\fP option should be used in conjunction with the
diff --git a/docs/libcurl/opts/CURLOPT_PINNEDPUBLICKEY.3 b/docs/libcurl/opts/CURLOPT_PINNEDPUBLICKEY.3
index fb9698c24..56171408e 100644
--- a/docs/libcurl/opts/CURLOPT_PINNEDPUBLICKEY.3
+++ b/docs/libcurl/opts/CURLOPT_PINNEDPUBLICKEY.3
@@ -28,7 +28,7 @@ CURLOPT_PINNEDPUBLICKEY \- set pinned public key
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PINNEDPUBLICKEY, char *pinnedpubkey);
 .SH DESCRIPTION
-Pass a pointer to a zero terminated string as parameter. The string can be the
+Pass a pointer to a null-terminated string as parameter. The string can be the
 file name of your pinned public key. The file format expected is "PEM" or "DER".
 The string can also be any number of base64 encoded sha256 hashes preceded by
 "sha256//" and separated by ";"
diff --git a/docs/libcurl/opts/CURLOPT_PRE_PROXY.3 b/docs/libcurl/opts/CURLOPT_PRE_PROXY.3
index 4f1fe4ddf..92ca524bb 100644
--- a/docs/libcurl/opts/CURLOPT_PRE_PROXY.3
+++ b/docs/libcurl/opts/CURLOPT_PRE_PROXY.3
@@ -29,7 +29,7 @@ CURLOPT_PRE_PROXY \- set pre-proxy to use
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PRE_PROXY, char *preproxy);
 .SH DESCRIPTION
 Set the \fIpreproxy\fP to use for the upcoming request. The parameter
-should be a char * to a zero terminated string holding the host name or dotted
+should be a char * to a null-terminated string holding the host name or dotted
 numerical IP address. A numerical IPv6 address must be written within
 [brackets].
 
diff --git a/docs/libcurl/opts/CURLOPT_PROXY.3 b/docs/libcurl/opts/CURLOPT_PROXY.3
index 97818e920..d64aebda0 100644
--- a/docs/libcurl/opts/CURLOPT_PROXY.3
+++ b/docs/libcurl/opts/CURLOPT_PROXY.3
@@ -29,7 +29,7 @@ CURLOPT_PROXY \- set proxy to use
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY, char *proxy);
 .SH DESCRIPTION
 Set the \fIproxy\fP to use for the upcoming request. The parameter should be a
-char * to a zero terminated string holding the host name or dotted numerical
+char * to a null-terminated string holding the host name or dotted numerical
 IP address. A numerical IPv6 address must be written within [brackets].
 
 To specify port number in this string, append :[port] to the end of the host
diff --git a/docs/libcurl/opts/CURLOPT_PROXYPASSWORD.3 b/docs/libcurl/opts/CURLOPT_PROXYPASSWORD.3
index 75b2b7df3..c164170dd 100644
--- a/docs/libcurl/opts/CURLOPT_PROXYPASSWORD.3
+++ b/docs/libcurl/opts/CURLOPT_PROXYPASSWORD.3
@@ -28,7 +28,7 @@ CURLOPT_PROXYPASSWORD \- password to use with proxy authentication
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXYPASSWORD, char *pwd);
 .SH DESCRIPTION
-Pass a char * as parameter, which should be pointing to the zero terminated
+Pass a char * as parameter, which should be pointing to the null-terminated
 password to use for authentication with the proxy.
 
 The \fICURLOPT_PROXYPASSWORD(3)\fP option should be used in conjunction with
diff --git a/docs/libcurl/opts/CURLOPT_PROXYUSERNAME.3 b/docs/libcurl/opts/CURLOPT_PROXYUSERNAME.3
index 54981b124..e4262e6db 100644
--- a/docs/libcurl/opts/CURLOPT_PROXYUSERNAME.3
+++ b/docs/libcurl/opts/CURLOPT_PROXYUSERNAME.3
@@ -30,7 +30,7 @@ CURLOPT_PROXYUSERNAME \- user name to use for proxy authentication
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXYUSERNAME,
                           char *username);
 .SH DESCRIPTION
-Pass a char * as parameter, which should be pointing to the zero terminated
+Pass a char * as parameter, which should be pointing to the null-terminated
 user name to use for the transfer.
 
 \fICURLOPT_PROXYUSERNAME(3)\fP sets the user name to be used in protocol
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_CAINFO.3 b/docs/libcurl/opts/CURLOPT_PROXY_CAINFO.3
index 3f866cb00..131da634b 100644
--- a/docs/libcurl/opts/CURLOPT_PROXY_CAINFO.3
+++ b/docs/libcurl/opts/CURLOPT_PROXY_CAINFO.3
@@ -30,7 +30,7 @@ CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_CAINFO, char *path);
 .SH DESCRIPTION
 This option is for connecting to an HTTPS proxy, not an HTTPS server.
 
-Pass a char * to a zero terminated string naming a file holding one or more
+Pass a char * to a null-terminated string naming a file holding one or more
 certificates to verify the HTTPS proxy with.
 
 If \fICURLOPT_PROXY_SSL_VERIFYPEER(3)\fP is zero and you avoid verifying the
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_CAPATH.3 b/docs/libcurl/opts/CURLOPT_PROXY_CAPATH.3
index e679409c9..6acec6bdb 100644
--- a/docs/libcurl/opts/CURLOPT_PROXY_CAPATH.3
+++ b/docs/libcurl/opts/CURLOPT_PROXY_CAPATH.3
@@ -28,7 +28,7 @@ CURLOPT_PROXY_CAPATH \- specify directory holding proxy CA certificates
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_CAPATH, char *capath);
 .SH DESCRIPTION
-Pass a char * to a zero terminated string naming a directory holding multiple
+Pass a char * to a null-terminated string naming a directory holding multiple
 CA certificates to verify the HTTPS proxy with. If libcurl is built against
 OpenSSL, the certificate directory must be prepared using the openssl c_rehash
 utility. This makes sense only when \fICURLOPT_PROXY_SSL_VERIFYPEER(3)\fP is
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_CRLFILE.3 b/docs/libcurl/opts/CURLOPT_PROXY_CRLFILE.3
index c959a696c..0333bf79f 100644
--- a/docs/libcurl/opts/CURLOPT_PROXY_CRLFILE.3
+++ b/docs/libcurl/opts/CURLOPT_PROXY_CRLFILE.3
@@ -30,7 +30,7 @@ CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_CRLFILE, char *file);
 .SH DESCRIPTION
 This option is for connecting to an HTTPS proxy, not an HTTPS server.
 
-Pass a char * to a zero terminated string naming a \fIfile\fP with the
+Pass a char * to a null-terminated string naming a \fIfile\fP with the
 concatenation of CRL (in PEM format) to use in the certificate validation that
 occurs during the SSL exchange.
 
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_ISSUERCERT.3 b/docs/libcurl/opts/CURLOPT_PROXY_ISSUERCERT.3
index 7e9402f08..f2add8163 100644
--- a/docs/libcurl/opts/CURLOPT_PROXY_ISSUERCERT.3
+++ b/docs/libcurl/opts/CURLOPT_PROXY_ISSUERCERT.3
@@ -28,7 +28,7 @@ CURLOPT_PROXY_ISSUERCERT \- proxy issuer SSL certificate filename
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_ISSUERCERT, char *file);
 .SH DESCRIPTION
-Pass a char * to a zero terminated string naming a \fIfile\fP holding a CA
+Pass a char * to a null-terminated string naming a \fIfile\fP holding a CA
 certificate in PEM format. If the option is set, an additional check against
 the peer certificate is performed to verify the issuer of the the HTTPS proxy
 is indeed the one associated with the certificate provided by the option.
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_KEYPASSWD.3 b/docs/libcurl/opts/CURLOPT_PROXY_KEYPASSWD.3
index 1c99f46e1..22c36a3bc 100644
--- a/docs/libcurl/opts/CURLOPT_PROXY_KEYPASSWD.3
+++ b/docs/libcurl/opts/CURLOPT_PROXY_KEYPASSWD.3
@@ -30,7 +30,7 @@ CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_KEYPASSWD, char *pwd);
 .SH DESCRIPTION
 This option is for connecting to an HTTPS proxy, not an HTTPS server.
 
-Pass a pointer to a zero terminated string as parameter. It will be used as
+Pass a pointer to a null-terminated string as parameter. It will be used as
 the password required to use the \fICURLOPT_PROXY_SSLKEY(3)\fP private key.
 You never needed a pass phrase to load a certificate but you need one to load
 your private key.
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_PINNEDPUBLICKEY.3 b/docs/libcurl/opts/CURLOPT_PROXY_PINNEDPUBLICKEY.3
index fbfb1509e..365c1ad4f 100644
--- a/docs/libcurl/opts/CURLOPT_PROXY_PINNEDPUBLICKEY.3
+++ b/docs/libcurl/opts/CURLOPT_PROXY_PINNEDPUBLICKEY.3
@@ -28,7 +28,7 @@ CURLOPT_PROXY_PINNEDPUBLICKEY \- set pinned public key for https proxy
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_PINNEDPUBLICKEY, char *pinnedpubkey);
 .SH DESCRIPTION
-Pass a pointer to a zero terminated string as parameter. The string can be the
+Pass a pointer to a null-terminated string as parameter. The string can be the
 file name of your pinned public key. The file format expected is "PEM" or "DER".
 The string can also be any number of base64 encoded sha256 hashes preceded by
 "sha256//" and separated by ";"
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_SSLCERT.3 b/docs/libcurl/opts/CURLOPT_PROXY_SSLCERT.3
index 912d83e32..5a4427018 100644
--- a/docs/libcurl/opts/CURLOPT_PROXY_SSLCERT.3
+++ b/docs/libcurl/opts/CURLOPT_PROXY_SSLCERT.3
@@ -30,7 +30,7 @@ CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSLCERT, char *cert);
 .SH DESCRIPTION
 This option is for connecting to an HTTPS proxy, not an HTTPS server.
 
-Pass a pointer to a zero terminated string as parameter. The string should be
+Pass a pointer to a null-terminated string as parameter. The string should be
 the file name of your client certificate used to connect to the HTTPS proxy.
 The default format is "P12" on Secure Transport and "PEM" on other engines,
 and can be changed with \fICURLOPT_PROXY_SSLCERTTYPE(3)\fP.
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_SSLCERTTYPE.3 b/docs/libcurl/opts/CURLOPT_PROXY_SSLCERTTYPE.3
index 9035ec1cc..2e26b27de 100644
--- a/docs/libcurl/opts/CURLOPT_PROXY_SSLCERTTYPE.3
+++ b/docs/libcurl/opts/CURLOPT_PROXY_SSLCERTTYPE.3
@@ -28,7 +28,7 @@ CURLOPT_PROXY_SSLCERTTYPE \- specify type of the proxy client SSL certificate
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSLCERTTYPE, char *type);
 .SH DESCRIPTION
-Pass a pointer to a zero terminated string as parameter. The string should be
+Pass a pointer to a null-terminated string as parameter. The string should be
 the format of your client certificate used when connecting to an HTTPS proxy.
 
 Supported formats are "PEM" and "DER", except with Secure Transport. OpenSSL
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_SSLKEY.3 b/docs/libcurl/opts/CURLOPT_PROXY_SSLKEY.3
index 8df1c1ee6..71023acc4 100644
--- a/docs/libcurl/opts/CURLOPT_PROXY_SSLKEY.3
+++ b/docs/libcurl/opts/CURLOPT_PROXY_SSLKEY.3
@@ -28,7 +28,7 @@ CURLOPT_PROXY_SSLKEY \- specify private keyfile for TLS and SSL proxy client cer
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSLKEY, char *keyfile);
 .SH DESCRIPTION
-Pass a pointer to a zero terminated string as parameter. The string should be
+Pass a pointer to a null-terminated string as parameter. The string should be
 the file name of your private key used for connecting to the HTTPS proxy. The
 default format is "PEM" and can be changed with
 \fICURLOPT_PROXY_SSLKEYTYPE(3)\fP.
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_SSLKEYTYPE.3 b/docs/libcurl/opts/CURLOPT_PROXY_SSLKEYTYPE.3
index d79ed9fcf..949a7bd7a 100644
--- a/docs/libcurl/opts/CURLOPT_PROXY_SSLKEYTYPE.3
+++ b/docs/libcurl/opts/CURLOPT_PROXY_SSLKEYTYPE.3
@@ -30,7 +30,7 @@ CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSLKEYTYPE, char *type);
 .SH DESCRIPTION
 This option is for connecting to an HTTPS proxy, not an HTTPS server.
 
-Pass a pointer to a zero terminated string as parameter. The string should be
+Pass a pointer to a null-terminated string as parameter. The string should be
 the format of your private key. Supported formats are "PEM", "DER" and "ENG".
 
 The application does not have to keep the string around after setting this
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_SSL_CIPHER_LIST.3 b/docs/libcurl/opts/CURLOPT_PROXY_SSL_CIPHER_LIST.3
index 86543a856..aed2a8ff5 100644
--- a/docs/libcurl/opts/CURLOPT_PROXY_SSL_CIPHER_LIST.3
+++ b/docs/libcurl/opts/CURLOPT_PROXY_SSL_CIPHER_LIST.3
@@ -28,7 +28,7 @@ CURLOPT_PROXY_SSL_CIPHER_LIST \- specify ciphers to use for proxy TLS
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_SSL_CIPHER_LIST, char *list);
 .SH DESCRIPTION
-Pass a char *, pointing to a zero terminated string holding the list of
+Pass a char *, pointing to a null-terminated string holding the list of
 ciphers to use for the connection to the HTTPS proxy. The list must be
 syntactically correct, it consists of one or more cipher strings separated by
 colons. Commas or spaces are also acceptable separators but colons are
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_TLS13_CIPHERS.3 b/docs/libcurl/opts/CURLOPT_PROXY_TLS13_CIPHERS.3
index db8349d8f..0346b6623 100644
--- a/docs/libcurl/opts/CURLOPT_PROXY_TLS13_CIPHERS.3
+++ b/docs/libcurl/opts/CURLOPT_PROXY_TLS13_CIPHERS.3
@@ -28,7 +28,7 @@ CURLOPT_PROXY_TLS13_CIPHERS \- ciphers suites for proxy TLS 1.3
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_TLS13_CIPHERS, char *list);
 .SH DESCRIPTION
-Pass a char *, pointing to a zero terminated string holding the list of cipher
+Pass a char *, pointing to a null-terminated string holding the list of cipher
 suites to use for the TLS 1.3 connection to a proxy. The list must be
 syntactically correct, it consists of one or more cipher suite strings
 separated by colons.
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_TLSAUTH_PASSWORD.3 b/docs/libcurl/opts/CURLOPT_PROXY_TLSAUTH_PASSWORD.3
index db3a3d1bb..0d3f24778 100644
--- a/docs/libcurl/opts/CURLOPT_PROXY_TLSAUTH_PASSWORD.3
+++ b/docs/libcurl/opts/CURLOPT_PROXY_TLSAUTH_PASSWORD.3
@@ -28,7 +28,7 @@ CURLOPT_PROXY_TLSAUTH_PASSWORD \- password to use for proxy TLS authentication
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_TLSAUTH_PASSWORD, char *pwd);
 .SH DESCRIPTION
-Pass a char * as parameter, which should point to the zero terminated password
+Pass a char * as parameter, which should point to the null-terminated password
 to use for the TLS authentication method specified with the
 \fICURLOPT_PROXY_TLSAUTH_TYPE(3)\fP option. Requires that the
 \fICURLOPT_PROXY_TLSAUTH_USERNAME(3)\fP option also be set.
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_TLSAUTH_TYPE.3 b/docs/libcurl/opts/CURLOPT_PROXY_TLSAUTH_TYPE.3
index 47f4dae4a..321ed5fce 100644
--- a/docs/libcurl/opts/CURLOPT_PROXY_TLSAUTH_TYPE.3
+++ b/docs/libcurl/opts/CURLOPT_PROXY_TLSAUTH_TYPE.3
@@ -28,7 +28,7 @@ CURLOPT_PROXY_TLSAUTH_TYPE \- set proxy TLS authentication methods
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_TLSAUTH_TYPE, char *type);
 .SH DESCRIPTION
-Pass a pointer to a zero terminated string as parameter. The string should be
+Pass a pointer to a null-terminated string as parameter. The string should be
 the method of the TLS authentication used for the HTTPS connection. Supported
 method is "SRP".
 
diff --git a/docs/libcurl/opts/CURLOPT_PROXY_TLSAUTH_USERNAME.3 b/docs/libcurl/opts/CURLOPT_PROXY_TLSAUTH_USERNAME.3
index 6a2c4388d..1fa4cce75 100644
--- a/docs/libcurl/opts/CURLOPT_PROXY_TLSAUTH_USERNAME.3
+++ b/docs/libcurl/opts/CURLOPT_PROXY_TLSAUTH_USERNAME.3
@@ -28,7 +28,7 @@ CURLOPT_PROXY_TLSAUTH_USERNAME \- user name to use for proxy TLS authentication
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_TLSAUTH_USERNAME, char *user);
 .SH DESCRIPTION
-Pass a char * as parameter, which should point to the zero terminated username
+Pass a char * as parameter, which should point to the null-terminated username
 to use for the HTTPS proxy TLS authentication method specified with the
 \fICURLOPT_PROXY_TLSAUTH_TYPE(3)\fP option. Requires that the
 \fICURLOPT_PROXY_TLSAUTH_PASSWORD(3)\fP option also be set.
diff --git a/docs/libcurl/opts/CURLOPT_RANDOM_FILE.3 b/docs/libcurl/opts/CURLOPT_RANDOM_FILE.3
index 9f3e3876d..ddbbd4502 100644
--- a/docs/libcurl/opts/CURLOPT_RANDOM_FILE.3
+++ b/docs/libcurl/opts/CURLOPT_RANDOM_FILE.3
@@ -28,7 +28,7 @@ CURLOPT_RANDOM_FILE \- specify a source for random data
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_RANDOM_FILE, char *path);
 .SH DESCRIPTION
-Pass a char * to a zero terminated file name. The file might be used to read
+Pass a char * to a null-terminated file name. The file might be used to read
 from to seed the random engine for SSL and more.
 
 The application does not have to keep the string around after setting this
diff --git a/docs/libcurl/opts/CURLOPT_REFERER.3 b/docs/libcurl/opts/CURLOPT_REFERER.3
index e17974696..e02257552 100644
--- a/docs/libcurl/opts/CURLOPT_REFERER.3
+++ b/docs/libcurl/opts/CURLOPT_REFERER.3
@@ -28,7 +28,7 @@ CURLOPT_REFERER \- set the HTTP referer header
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_REFERER, char *where);
 .SH DESCRIPTION
-Pass a pointer to a zero terminated string as parameter. It will be used to
+Pass a pointer to a null-terminated string as parameter. It will be used to
 set the Referer: header in the http request sent to the remote server. This
 can be used to fool servers or scripts. You can also set any custom header
 with \fICURLOPT_HTTPHEADER(3)\fP.
diff --git a/docs/libcurl/opts/CURLOPT_SASL_AUTHZID.3 b/docs/libcurl/opts/CURLOPT_SASL_AUTHZID.3
index 65445475d..272cab060 100644
--- a/docs/libcurl/opts/CURLOPT_SASL_AUTHZID.3
+++ b/docs/libcurl/opts/CURLOPT_SASL_AUTHZID.3
@@ -28,7 +28,7 @@ CURLOPT_SASL_AUTHZID \- authorisation identity (identity to act as)
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SASL_AUTHZID, char *authzid);
 .SH DESCRIPTION
-Pass a char * as parameter, which should be pointing to the zero terminated
+Pass a char * as parameter, which should be pointing to the null-terminated
 authorisation identity (authzid) for the transfer. Only applicable to the PLAIN
 SASL authentication mechanism where it is optional.
 
diff --git a/docs/libcurl/opts/CURLOPT_SSH_KEYFUNCTION.3 b/docs/libcurl/opts/CURLOPT_SSH_KEYFUNCTION.3
index dc025d6ee..895bc3687 100644
--- a/docs/libcurl/opts/CURLOPT_SSH_KEYFUNCTION.3
+++ b/docs/libcurl/opts/CURLOPT_SSH_KEYFUNCTION.3
@@ -44,7 +44,7 @@ enum curl_khmatch {
 };
 
 struct curl_khkey {
-  const char *key; /* points to a zero-terminated string encoded with
+  const char *key; /* points to a null-terminated string encoded with
                       base64 if len is zero, otherwise to the "raw"
                       data */
   size_t len;
diff --git a/docs/libcurl/opts/CURLOPT_SSH_KNOWNHOSTS.3 b/docs/libcurl/opts/CURLOPT_SSH_KNOWNHOSTS.3
index 8da76a9f4..eff7b0e83 100644
--- a/docs/libcurl/opts/CURLOPT_SSH_KNOWNHOSTS.3
+++ b/docs/libcurl/opts/CURLOPT_SSH_KNOWNHOSTS.3
@@ -28,7 +28,7 @@ CURLOPT_SSH_KNOWNHOSTS \- file name holding the SSH known hosts
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSH_KNOWNHOSTS, char *fname);
 .SH DESCRIPTION
-Pass a pointer to a zero terminated string holding the file name of the
+Pass a pointer to a null-terminated string holding the file name of the
 known_host file to use.  The known_hosts file should use the OpenSSH file
 format as supported by libssh2. If this file is specified, libcurl will only
 accept connections with hosts that are known and present in that file, with a
diff --git a/docs/libcurl/opts/CURLOPT_SSLCERT.3 b/docs/libcurl/opts/CURLOPT_SSLCERT.3
index 4a43584c3..278232750 100644
--- a/docs/libcurl/opts/CURLOPT_SSLCERT.3
+++ b/docs/libcurl/opts/CURLOPT_SSLCERT.3
@@ -28,7 +28,7 @@ CURLOPT_SSLCERT \- set SSL client certificate
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSLCERT, char *cert);
 .SH DESCRIPTION
-Pass a pointer to a zero terminated string as parameter. The string should be
+Pass a pointer to a null-terminated string as parameter. The string should be
 the file name of your client certificate. The default format is "P12" on
 Secure Transport and "PEM" on other engines, and can be changed with
 \fICURLOPT_SSLCERTTYPE(3)\fP.
diff --git a/docs/libcurl/opts/CURLOPT_SSLCERTTYPE.3 b/docs/libcurl/opts/CURLOPT_SSLCERTTYPE.3
index 294ceb56f..d249523eb 100644
--- a/docs/libcurl/opts/CURLOPT_SSLCERTTYPE.3
+++ b/docs/libcurl/opts/CURLOPT_SSLCERTTYPE.3
@@ -28,7 +28,7 @@ CURLOPT_SSLCERTTYPE \- specify type of the client SSL certificate
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSLCERTTYPE, char *type);
 .SH DESCRIPTION
-Pass a pointer to a zero terminated string as parameter. The string should be
+Pass a pointer to a null-terminated string as parameter. The string should be
 the format of your certificate. Supported formats are "PEM" and "DER", except
 with Secure Transport. OpenSSL (versions 0.9.3 and later) and Secure Transport
 (on iOS 5 or later, or OS X 10.7 or later) also support "P12" for
diff --git a/docs/libcurl/opts/CURLOPT_SSLENGINE.3 b/docs/libcurl/opts/CURLOPT_SSLENGINE.3
index 179c56839..0244aabd8 100644
--- a/docs/libcurl/opts/CURLOPT_SSLENGINE.3
+++ b/docs/libcurl/opts/CURLOPT_SSLENGINE.3
@@ -28,7 +28,7 @@ CURLOPT_SSLENGINE \- set SSL engine identifier
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSLENGINE, char *id);
 .SH DESCRIPTION
-Pass a pointer to a zero terminated string as parameter. It will be used as
+Pass a pointer to a null-terminated string as parameter. It will be used as
 the identifier for the crypto engine you want to use for your private key.
 
 The application does not have to keep the string around after setting this
diff --git a/docs/libcurl/opts/CURLOPT_SSLKEY.3 b/docs/libcurl/opts/CURLOPT_SSLKEY.3
index e3216992d..ed2ec160e 100644
--- a/docs/libcurl/opts/CURLOPT_SSLKEY.3
+++ b/docs/libcurl/opts/CURLOPT_SSLKEY.3
@@ -28,7 +28,7 @@ CURLOPT_SSLKEY \- specify private keyfile for TLS and SSL client cert
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSLKEY, char *keyfile);
 .SH DESCRIPTION
-Pass a pointer to a zero terminated string as parameter. The string should be
+Pass a pointer to a null-terminated string as parameter. The string should be
 the file name of your private key. The default format is "PEM" and can be
 changed with \fICURLOPT_SSLKEYTYPE(3)\fP.
 
diff --git a/docs/libcurl/opts/CURLOPT_SSLKEYTYPE.3 b/docs/libcurl/opts/CURLOPT_SSLKEYTYPE.3
index 42368fbee..8136b25f6 100644
--- a/docs/libcurl/opts/CURLOPT_SSLKEYTYPE.3
+++ b/docs/libcurl/opts/CURLOPT_SSLKEYTYPE.3
@@ -28,7 +28,7 @@ CURLOPT_SSLKEYTYPE \- set type of the private key file
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSLKEYTYPE, char *type);
 .SH DESCRIPTION
-Pass a pointer to a zero terminated string as parameter. The string should be
+Pass a pointer to a null-terminated string as parameter. The string should be
 the format of your private key. Supported formats are "PEM", "DER" and "ENG".
 
 The format "ENG" enables you to load the private key from a crypto engine. In
diff --git a/docs/libcurl/opts/CURLOPT_SSL_CIPHER_LIST.3 b/docs/libcurl/opts/CURLOPT_SSL_CIPHER_LIST.3
index cefda8a95..be18470af 100644
--- a/docs/libcurl/opts/CURLOPT_SSL_CIPHER_LIST.3
+++ b/docs/libcurl/opts/CURLOPT_SSL_CIPHER_LIST.3
@@ -28,7 +28,7 @@ CURLOPT_SSL_CIPHER_LIST \- specify ciphers to use for TLS
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSL_CIPHER_LIST, char *list);
 .SH DESCRIPTION
-Pass a char *, pointing to a zero terminated string holding the list of
+Pass a char *, pointing to a null-terminated string holding the list of
 ciphers to use for the SSL connection. The list must be syntactically correct,
 it consists of one or more cipher strings separated by colons. Commas or
 spaces are also acceptable separators but colons are normally used, \&!, \&-
diff --git a/docs/libcurl/opts/CURLOPT_TLS13_CIPHERS.3 b/docs/libcurl/opts/CURLOPT_TLS13_CIPHERS.3
index 795b1642b..0ea8507e6 100644
--- a/docs/libcurl/opts/CURLOPT_TLS13_CIPHERS.3
+++ b/docs/libcurl/opts/CURLOPT_TLS13_CIPHERS.3
@@ -28,7 +28,7 @@ CURLOPT_TLS13_CIPHERS \- specify ciphers suites to use for TLS 1.3
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TLS13_CIPHERS, char *list);
 .SH DESCRIPTION
-Pass a char *, pointing to a zero terminated string holding the list of cipher
+Pass a char *, pointing to a null-terminated string holding the list of cipher
 suites to use for the TLS 1.3 connection. The list must be syntactically
 correct, it consists of one or more cipher suite strings separated by colons.
 
diff --git a/docs/libcurl/opts/CURLOPT_TLSAUTH_PASSWORD.3 b/docs/libcurl/opts/CURLOPT_TLSAUTH_PASSWORD.3
index 044d822e5..081c32e8f 100644
--- a/docs/libcurl/opts/CURLOPT_TLSAUTH_PASSWORD.3
+++ b/docs/libcurl/opts/CURLOPT_TLSAUTH_PASSWORD.3
@@ -28,7 +28,7 @@ CURLOPT_TLSAUTH_PASSWORD \- password to use for TLS authentication
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TLSAUTH_PASSWORD, char *pwd);
 .SH DESCRIPTION
-Pass a char * as parameter, which should point to the zero terminated password
+Pass a char * as parameter, which should point to the null-terminated password
 to use for the TLS authentication method specified with the
 \fICURLOPT_TLSAUTH_TYPE(3)\fP option. Requires that the
 \fICURLOPT_TLSAUTH_USERNAME(3)\fP option also be set.
diff --git a/docs/libcurl/opts/CURLOPT_TLSAUTH_TYPE.3 b/docs/libcurl/opts/CURLOPT_TLSAUTH_TYPE.3
index 744b5e46b..58860db39 100644
--- a/docs/libcurl/opts/CURLOPT_TLSAUTH_TYPE.3
+++ b/docs/libcurl/opts/CURLOPT_TLSAUTH_TYPE.3
@@ -28,7 +28,7 @@ CURLOPT_TLSAUTH_TYPE \- set TLS authentication methods
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TLSAUTH_TYPE, char *type);
 .SH DESCRIPTION
-Pass a pointer to a zero terminated string as parameter. The string should be
+Pass a pointer to a null-terminated string as parameter. The string should be
 the method of the TLS authentication. Supported method is "SRP".
 
 .IP SRP
diff --git a/docs/libcurl/opts/CURLOPT_TLSAUTH_USERNAME.3 b/docs/libcurl/opts/CURLOPT_TLSAUTH_USERNAME.3
index 78f195581..cad8aa644 100644
--- a/docs/libcurl/opts/CURLOPT_TLSAUTH_USERNAME.3
+++ b/docs/libcurl/opts/CURLOPT_TLSAUTH_USERNAME.3
@@ -28,7 +28,7 @@ CURLOPT_TLSAUTH_USERNAME \- user name to use for TLS authentication
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TLSAUTH_USERNAME, char *user);
 .SH DESCRIPTION
-Pass a char * as parameter, which should point to the zero terminated username
+Pass a char * as parameter, which should point to the null-terminated username
 to use for the TLS authentication method specified with the
 \fICURLOPT_TLSAUTH_TYPE(3)\fP option. Requires that the
 \fICURLOPT_TLSAUTH_PASSWORD(3)\fP option also be set.
diff --git a/docs/libcurl/opts/CURLOPT_URL.3 b/docs/libcurl/opts/CURLOPT_URL.3
index a5dcf9167..036818741 100644
--- a/docs/libcurl/opts/CURLOPT_URL.3
+++ b/docs/libcurl/opts/CURLOPT_URL.3
@@ -29,7 +29,7 @@ CURLOPT_URL \- provide the URL to use in the request
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_URL, char *URL);
 .SH DESCRIPTION
 Pass in a pointer to the \fIURL\fP to work with. The parameter should be a
-char * to a zero terminated string which must be URL-encoded in the following
+char * to a null-terminated string which must be URL-encoded in the following
 format:
 
 scheme://host:port/path
diff --git a/docs/libcurl/opts/CURLOPT_USERAGENT.3 b/docs/libcurl/opts/CURLOPT_USERAGENT.3
index 2fd34ec6a..7a16223d9 100644
--- a/docs/libcurl/opts/CURLOPT_USERAGENT.3
+++ b/docs/libcurl/opts/CURLOPT_USERAGENT.3
@@ -28,7 +28,7 @@ CURLOPT_USERAGENT \- set HTTP user-agent header
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_USERAGENT, char *ua);
 .SH DESCRIPTION
-Pass a pointer to a zero terminated string as parameter. It will be used to
+Pass a pointer to a null-terminated string as parameter. It will be used to
 set the User-Agent: header in the HTTP request sent to the remote server. This
 can be used to fool servers or scripts. You can also set any custom header
 with \fICURLOPT_HTTPHEADER(3)\fP.
diff --git a/docs/libcurl/opts/CURLOPT_USERNAME.3 b/docs/libcurl/opts/CURLOPT_USERNAME.3
index 116b205da..c8cb90eec 100644
--- a/docs/libcurl/opts/CURLOPT_USERNAME.3
+++ b/docs/libcurl/opts/CURLOPT_USERNAME.3
@@ -30,7 +30,7 @@ CURLOPT_USERNAME \- user name to use in authentication
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_USERNAME,
                           char *username);
 .SH DESCRIPTION
-Pass a char * as parameter, which should be pointing to the zero terminated
+Pass a char * as parameter, which should be pointing to the null-terminated
 user name to use for the transfer.
 
 \fICURLOPT_USERNAME(3)\fP sets the user name to be used in protocol
diff --git a/docs/libcurl/opts/CURLOPT_USERPWD.3 b/docs/libcurl/opts/CURLOPT_USERPWD.3
index 0dec56bfe..10b674523 100644
--- a/docs/libcurl/opts/CURLOPT_USERPWD.3
+++ b/docs/libcurl/opts/CURLOPT_USERPWD.3
@@ -28,7 +28,7 @@ CURLOPT_USERPWD \- user name and password to use in authentication
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_USERPWD, char *userpwd);
 .SH DESCRIPTION
-Pass a char * as parameter, pointing to a zero terminated login details string
+Pass a char * as parameter, pointing to a null-terminated login details string
 for the connection. The format of which is: [user name]:[password].
 
 When using Kerberos V5 authentication with a Windows based server, you should
diff --git a/docs/libcurl/opts/CURLOPT_WRITEFUNCTION.3 b/docs/libcurl/opts/CURLOPT_WRITEFUNCTION.3
index 254246ec1..cba599e9b 100644
--- a/docs/libcurl/opts/CURLOPT_WRITEFUNCTION.3
+++ b/docs/libcurl/opts/CURLOPT_WRITEFUNCTION.3
@@ -52,7 +52,7 @@ means 100K.
 This function may be called with zero bytes data if the transferred file is
 empty.
 
-The data passed to this function will not be zero terminated!
+The data passed to this function will not be null-terminated!
 
 Set the \fIuserdata\fP argument with the \fICURLOPT_WRITEDATA(3)\fP option.
 
diff --git a/docs/libcurl/opts/CURLOPT_XOAUTH2_BEARER.3 b/docs/libcurl/opts/CURLOPT_XOAUTH2_BEARER.3
index 9ab9726d3..8811e65f8 100644
--- a/docs/libcurl/opts/CURLOPT_XOAUTH2_BEARER.3
+++ b/docs/libcurl/opts/CURLOPT_XOAUTH2_BEARER.3
@@ -28,7 +28,7 @@ CURLOPT_XOAUTH2_BEARER \- specify OAuth 2.0 access token
 
 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_XOAUTH2_BEARER, char *token);
 .SH DESCRIPTION
-Pass a char * as parameter, which should point to the zero terminated OAuth
+Pass a char * as parameter, which should point to the null-terminated OAuth
 2.0 Bearer Access Token for use with HTTP, IMAP, POP3 and SMTP servers
 that support the OAuth 2.0 Authorization Framework.