Replace `iff' in doc-strings and comments.

lisp/gnus/ChangeLog

+2007-08-08  Glenn Morris  <rgm@gnu.org>
+
+	* gmm-utils.el, gnus-async.el, gnus-msg.el, gnus-score.el
+	* gnus-util.el, imap.el, mailcap.el, nnimap.el: Replace `iff' in
+	doc-strings and comments.
+
 2007-07-25  Glenn Morris  <rgm@gnu.org>
 
 	* Relicense all FSF files to GPLv3 or later.

lisp/international/ja-dic-cnv.el

@@ -215,8 +215,8 @@
 ;; Return t if substring of STR (between FROM and TO) can be broken up
 ;; to chunks all of which can be derived from another entry in SKK
 ;; dictionary.  SKKBUF is the buffer where the original SKK dictionary
-;; is visited, KANA is the current entry for STR.  FIRST is t iff this
-;; is called at top level.
+;; is visited, KANA is the current entry for STR.  FIRST is t only if
+;; this is called at top level.
 
 (defun skkdic-breakup-string (skkbuf kana str from to &optional first)
   (let ((len (- to from)))

lisp/international/latin1-disp.el

@@ -777,9 +777,9 @@ use either \\[customize] or the function `latin1-display'."
   "Set up Latin-1/ASCII display for Unicode characters.
 This uses the transliterations of the Lynx browser.
 
-With argument ARG, turn such display on iff ARG is positive, otherwise
+With argument ARG, turn such display on if ARG is positive, otherwise
 turn it off and display Unicode characters literally.  The display
-is't changed if the display can render Unicode characters."
+isn't changed if the display can render Unicode characters."
   (interactive "p")
   (if (> arg 0)
       (unless (char-displayable-p

lisp/international/mule-cmds.el

@@ -445,11 +445,11 @@ non-nil, it is used to sort CODINGS instead."
 		    (let ((base (coding-system-base x)))
 		      ;; We calculate the priority number 0..255 by
 		      ;; using the 8 bits PMMLCEII as this:
-		      ;; P: 1 iff most preferred.
-		      ;; MM: greater than 0 iff mime-charset.
-		      ;; L: 1 iff one of the current lang. env.'s codings.
-		      ;; C: 1 iff one of codings listed in the category list.
-		      ;; E: 1 iff not XXX-with-esc
+		      ;; P: 1 if most preferred.
+		      ;; MM: greater than 0 if mime-charset.
+		      ;; L: 1 if one of the current lang. env.'s codings.
+		      ;; C: 1 if one of codings listed in the category list.
+		      ;; E: 1 if not XXX-with-esc
 		      ;; II: if iso-2022 based, 0..3, else 1.
 		      (logior
 		       (lsh (if (eq base most-preferred) 1 0) 7)

lisp/international/quail.el

@@ -1942,7 +1942,7 @@ Remaining args are for FUNC."
       (overlay-put quail-overlay 'face 'highlight))))
 
 (defun quail-require-guidance-buf ()
-  "Return t iff the current Quail package requires showing guidance buffer."
+  "Return t if the current Quail package requires showing guidance buffer."
   (and input-method-verbose-flag
        (if (eq input-method-verbose-flag 'default)
 	   (not (and (eq (selected-window) (minibuffer-window))

lisp/term/sun-mouse.el

@@ -230,7 +230,7 @@ Handles wrapped and horizontally scrolled lines correctly."
 
 
 (defun minibuffer-window-p (window)
-  "True iff this WINDOW is minibuffer."
+  "True if this WINDOW is minibuffer."
   (= (frame-height)
      (nth 3 (window-edges window))	; The bottom edge.
      ))

lisp/term/tvi970.el

@@ -106,8 +106,8 @@
 
 ;;; Should keypad numbers send ordinary digits or distinct escape sequences?
 (defvar tvi970-keypad-numeric nil
-  "The terminal should be in numeric keypad mode iff this variable is non-nil.
-Do not set this variable!  Call the function ``tvi970-set-keypad-mode''.")
+  "Non-nil means the terminal should be in numeric keypad mode.
+Do not set this variable!  Call the function `tvi970-set-keypad-mode'.")
 
 (defun tvi970-set-keypad-mode (&optional arg)
   "Set the current mode of the TVI 970 numeric keypad.

lisp/textmodes/artist.el

@@ -1768,7 +1768,7 @@ info-variant-part."
 ;; Macro that won't funcall the function if it is nil.
 ;;
 (defmacro artist-funcall (fn &rest args)
-  "Call function FN with ARGS iff FN is not nil."
+  "Call function FN with ARGS, if FN is not nil."
   (list 'if fn (cons 'funcall (cons fn args))))
 
 (defun artist-uniq (l)

lisp/textmodes/flyspell.el

@@ -457,7 +457,8 @@ See also `flyspell-duplicate-distance'."
 This spawns a single Ispell process and checks each word.
 The default flyspell behavior is to highlight incorrect words.
 With no argument, this command toggles Flyspell mode.
-With a prefix argument ARG, turn Flyspell minor mode on iff ARG is positive.
+With a prefix argument ARG, turn Flyspell minor mode on if ARG is positive,
+otherwise turn it off.
 
 Bindings:
 \\[ispell-word]: correct words (using Ispell).
@@ -1621,7 +1622,7 @@ FLYSPELL-BUFFER."
 ;;*    flyspell-overlay-p ...                                           */
 ;;*---------------------------------------------------------------------*/
 (defun flyspell-overlay-p (o)
-  "A predicate that return true iff O is an overlay used by flyspell."
+  "Return true if O is an overlay used by flyspell."
   (and (overlayp o) (overlay-get o 'flyspell-overlay)))
 
 ;;*---------------------------------------------------------------------*/

lisp/textmodes/ispell.el

@@ -3324,7 +3324,8 @@ available on the net."
 ;;;###autoload
 (defun ispell-minor-mode (&optional arg)
   "Toggle Ispell minor mode.
-With prefix arg, turn Ispell minor mode on iff arg is positive.
+With prefix argument ARG, turn Ispell minor mode on if ARG is positive,
+otherwise turn it off.
 
 In Ispell minor mode, pressing SPC or RET
 warns you if the previous word is incorrectly spelled.

lisp/textmodes/nroff-mode.el

@@ -261,7 +261,7 @@ automatically inserts the matching closing request after point."
 `nroff-electric-newline' forces Emacs to check for an nroff request at the
 beginning of the line, and insert the matching closing request if necessary.
 This command toggles that mode (off->on, on->off), with an argument,
-turns it on iff arg is positive, otherwise off."
+turns it on if arg is positive, otherwise off."
   :lighter " Electric"
   (or (derived-mode-p 'nroff-mode) (error "Must be in nroff mode")))
 

lisp/textmodes/refill.el

@@ -217,7 +217,7 @@ complex processing.")
 ;;;###autoload
 (define-minor-mode refill-mode
   "Toggle Refill minor mode.
-With prefix arg, turn Refill mode on iff arg is positive.
+With prefix arg, turn Refill mode on if arg is positive, otherwise turn it off.
 
 When Refill mode is on, the current paragraph will be formatted when
 changes are made within it.  Self-inserting characters only cause

lisp/textmodes/reftex-global.el

@@ -431,7 +431,7 @@ the current TeX document.
 
 With no argument, this command toggles
 `reftex-isearch-minor-mode'.  With a prefix argument ARG, turn
-`reftex-isearch-minor-mode' on iff ARG is positive."
+`reftex-isearch-minor-mode' on if ARG is positive, otherwise turn it off."
   (interactive "P")
   (let ((old-reftex-isearch-minor-mode reftex-isearch-minor-mode))
     (setq reftex-isearch-minor-mode 

lisp/textmodes/sgml-mode.el

@@ -757,7 +757,7 @@ With prefix argument ARG, repeat this ARG times."
 (defun sgml-skip-tag-forward (arg)
   "Skip to end of tag or matching closing tag if present.
 With prefix argument ARG, repeat this ARG times.
-Return t iff after a closing tag."
+Return t if after a closing tag."
   (interactive "p")
   ;; FIXME: Use sgml-get-context or something similar.
   ;; It currently might jump to an unrelated </P> if the <P>

lisp/textmodes/two-column.el

@@ -561,8 +561,10 @@ off trailing spaces with \\[delete-trailing-whitespace]."
   (newline arg))
 
 (defun 2C-toggle-autoscroll (arg)
-  "Toggle autoscrolling, or set it iff prefix ARG is non-nil and positive.
-When autoscrolling is turned on, this also realigns the two buffers."
+  "Toggle autoscrolling.
+With prefix argument ARG, turn on autoscrolling if ARG is
+positive, otherwise turn it off.  When autoscrolling is turned
+on, this also realigns the two buffers."
   (interactive "P")
   ;(sit-for 0)
   (setq 2C-autoscroll-start (window-start))

lisp/url/url-auth.el

@@ -310,7 +310,7 @@ RATING   a rating between 1 and 10 of the strength of the authentication.
 		  url-registered-auth-schemes)))))
 
 (defun url-auth-registered (scheme)
-  ;; Return non-nil iff SCHEME is registered as an auth type
+  "Return non-nil if SCHEME is registered as an auth type."
   (assoc scheme url-registered-auth-schemes))
 
 (provide 'url-auth)

lisp/url/url-cache.el

@@ -186,7 +186,7 @@ Very fast if you have an `md5' primitive function, suitably fast otherwise."
 
 ;;;###autoload
 (defun url-cache-expired (url mod)
-  "Return t iff a cached file has expired."
+  "Return t if a cached file has expired."
   (let* ((urlobj (if (vectorp url) url (url-generic-parse-url url)))
 	 (type (url-type urlobj)))
     (cond

lisp/url/url-dav.el

@@ -562,7 +562,7 @@ FAILURE-RESULTS is a list of (URL STATUS)."
 
 (defun url-dav-unlock-resource (url lock-token)
   "Release the lock on URL represented by LOCK-TOKEN.
-Returns t iff the lock was successfully released."
+Returns t if the lock was successfully released."
   (declare (special url-http-response-status))
   (let* ((url-request-extra-headers (list (cons "Lock-Token"
 						(concat "<" lock-token ">"))))
@@ -654,13 +654,13 @@ Returns t iff the lock was successfully released."
          (or (plist-get properties 'DAV:getcontentlength) 0)
 
          ;; file modes as a string like `ls -l'
-         ;; 
+         ;;
          ;; Should be able to build this up from the
          ;; DAV:supportedlock attribute pretty easily.  Getting
          ;; the group info could be impossible though.
          (url-dav-file-attributes-mode-string properties)
 
-         ;; t iff file's gid would change if it were deleted &
+         ;; t if file's gid would change if it were deleted &
          ;; recreated.  No way for us to know that thru DAV.
          nil
 

lisp/url/url-file.el

@@ -52,7 +52,7 @@ to them."
     found))
 
 (defun url-file-host-is-local-p (host)
-  "Return t iff HOST references our local machine."
+  "Return t if HOST references our local machine."
   (let ((case-fold-search t))
     (or
      (null host)

lisp/url/vc-dav.el

@@ -31,7 +31,7 @@
 
 ;;; Required functions for a vc backend
 (defun vc-dav-registered (url)
-  "Return t iff URL is registered with a DAV aware server."
+  "Return t if URL is registered with a DAV aware server."
   (url-dav-vc-registered url))
 
 (defun vc-dav-state (url)