From 2bdb2cd10d08a1d9c9a187c7d967fdc64b8e6743 Mon Sep 17 00:00:00 2001
From: Mattias Engdegård <mattiase@acm.org>
Date: Thu, 28 May 2020 16:37:27 +0200
Subject: Document that {en,de}code-coding-string preserve match data
* lisp/international/mule.el (define-coding-system):
Require :pre-write-conversion and :post-read-conversion functions
to leave the match data untouched.
* src/coding.c (Fdecode_coding_string, Fencode_coding_string):
Document functions as match-data-preserving.
Suggested by Stefan Monnier (see bug#41445).
---
src/coding.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
(limited to 'src/coding.c')
diff --git a/src/coding.c b/src/coding.c
index 34f36d5a86a..071124b4ef1 100644
--- a/src/coding.c
+++ b/src/coding.c
@@ -10395,7 +10395,7 @@ representation of the decoded text.
This function sets `last-coding-system-used' to the precise coding system
used (which may be different from CODING-SYSTEM if CODING-SYSTEM is
-not fully specified.) */)
+not fully specified.) The function does not change the match data. */)
(Lisp_Object string, Lisp_Object coding_system, Lisp_Object nocopy, Lisp_Object buffer)
{
return code_convert_string (string, coding_system, buffer,
@@ -10415,7 +10415,7 @@ case, the return value is the length of the encoded text.
This function sets `last-coding-system-used' to the precise coding system
used (which may be different from CODING-SYSTEM if CODING-SYSTEM is
-not fully specified.) */)
+not fully specified.) The function does not change the match data. */)
(Lisp_Object string, Lisp_Object coding_system, Lisp_Object nocopy, Lisp_Object buffer)
{
return code_convert_string (string, coding_system, buffer,
--
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