From d414170754dc3d6016cb12268d3eab08ed2d3650 Mon Sep 17 00:00:00 2001
From: morioka <morioka>
Date: Thu, 9 Apr 1998 00:21:36 +0000
Subject: [PATCH] (char-next-index): New macro.

---
 emu-e19.el    |   31 ++++++++++++++++++-------------
 emu-e20.el    |   14 ++++++++++----
 emu-mule.el   |    9 ++++++++-
 emu-nemacs.el |   24 ++++++++++++++++--------
 emu-x20.el    |    4 ++++
 5 files changed, 56 insertions(+), 26 deletions(-)

diff --git a/emu-e19.el b/emu-e19.el
index af1a841..f4f22ab 100644
--- a/emu-e19.el
+++ b/emu-e19.el
@@ -243,32 +243,37 @@ find-file-hooks, etc.
 ;;; @ character
 ;;;
 
-(defun char-charset (chr)
-  "Return the character set of char CHR.
-\[emu-e19.el; XEmacs 20 emulating function]"
+(defun char-charset (char)
+  "Return the character set of char CHAR."
   (if (< chr 128)
       charset-ascii
     charset-latin-iso8859-1))
 
 (defun char-bytes (char)
-  "Return number of bytes a character in CHAR occupies in a buffer.
-\[emu-e19.el; MULE emulating function]"
+  "Return number of bytes a character in CHAR occupies in a buffer."
   1)
 
-(defalias 'char-length 'char-bytes)
-
-(defun char-columns (character)
-  "Return number of columns a CHARACTER occupies when displayed.
-\[emu-e19.el]"
+(defun char-width (char)
+  "Return number of columns a CHAR occupies when displayed."
   1)
 
-;;; @@ for old MULE emulation
-;;;
+(defmacro char-next-index (char index)
+  "Return index of character succeeding CHAR whose index is INDEX."
+  (` (1+ index)))
 
-(defalias 'char-width 'char-columns)
+;;; @@ Mule emulating aliases
+;;;
+;;; You should not use them.
 
 (defalias 'char-leading-char 'char-charset)
 
+;;; @@ obsoleted aliases
+;;;
+;;; You should not use them.
+
+(defalias 'char-length 'char-bytes)
+(defalias 'char-columns 'char-width)
+
 
 ;;; @ string
 ;;;
diff --git a/emu-e20.el b/emu-e20.el
index 5eaafcf..6f51347 100644
--- a/emu-e20.el
+++ b/emu-e20.el
@@ -174,10 +174,9 @@ code conversion will not take place."
 ;;; @ character
 ;;;
 
-(defalias 'char-length 'char-bytes)
-
-(defalias 'char-columns 'char-width)
-
+(defmacro char-next-index (char index)
+  "Return index of character succeeding CHAR whose index is INDEX."
+  `(+ index (char-bytes char)))
 
 ;;; @@ Mule emulating aliases
 ;;;
@@ -190,6 +189,13 @@ TABLE defaults to the current buffer's category table."
   (category-set-mnemonics (char-category-set character))
   )
 
+;;; @@ obsoleted aliases
+;;;
+;;; You should not use them.
+
+(defalias 'char-length 'char-bytes)
+(defalias 'char-columns 'char-width)
+
 
 ;;; @ string
 ;;;
diff --git a/emu-mule.el b/emu-mule.el
index c726ab9..eed2bd7 100644
--- a/emu-mule.el
+++ b/emu-mule.el
@@ -317,8 +317,15 @@ It must be symbol.")
 
 (defalias 'char-charset 'char-leading-char)
 
-(defalias 'char-length 'char-bytes)
+(defmacro char-next-index (char index)
+  "Return index of character succeeding CHAR whose index is INDEX."
+  (` (+ index (char-bytes char))))
+
+;;; @@ obsoleted aliases
+;;;
+;;; You should not use them.
 
+(defalias 'char-length 'char-bytes)
 (defalias 'char-columns 'char-width)
 
 
diff --git a/emu-nemacs.el b/emu-nemacs.el
index 0ded890..62826c8 100644
--- a/emu-nemacs.el
+++ b/emu-nemacs.el
@@ -314,7 +314,7 @@ find-file-hooks, etc.
 
 (defun char-charset (chr)
   "Return the character set of char CHR.
-\[emu-nemacs.el; XEmacs 20 emulating function]"
+\[emu-nemacs.el; MULE emulating function]"
   (if (< chr 128)
       charset-ascii
     charset-jisx0208))
@@ -324,21 +324,29 @@ find-file-hooks, etc.
 \[emu-nemacs.el; Mule emulating function]"
   (if (< chr 128) 1 2))
 
-(defalias 'char-length 'char-bytes)
-
-(defun char-columns (character)
-  "Return number of columns a CHARACTER occupies when displayed.
+(defun char-width (char)
+  "Return number of columns a CHAR occupies when displayed.
 \[emu-nemacs.el]"
-  (if (< character 128)
+  (if (< char 128)
       1
     2))
 
-;;; @@ for Mule emulation
+(defmacro char-next-index (char index)
+  "Return index of character succeeding CHAR whose index is INDEX."
+  (` (1+ index)))
+
+;;; @@ Old Mule emulating aliases
 ;;;
+;;; You should not use them.
 
 (defalias 'char-leading-char 'char-charset)
 
-(defalias 'char-width 'char-columns)
+;;; @@ obsoleted aliases
+;;;
+;;; You should not use them.
+
+(defalias 'char-length 'char-bytes)
+(defalias 'char-columns 'char-width)
 
 
 ;;; @ string
diff --git a/emu-x20.el b/emu-x20.el
index 32a0618..873bdc7 100644
--- a/emu-x20.el
+++ b/emu-x20.el
@@ -144,6 +144,10 @@ find-file-hooks, etc.
 ;;; @ character
 ;;;
 
+(defmacro char-next-index (char index)
+  "Return index of character succeeding CHAR whose index is INDEX."
+  `(1+ index))
+
 ;;; @@ Mule emulating aliases
 ;;;
 ;;; You should not use them.
-- 
1.7.10.4