From: Bruno Haible <bruno@clisp.org>
Date: Sun, 11 Feb 2007 17:17:09 +0000 (+0000)
Subject: Support for copying multibyte string iterators.
X-Git-Tag: cvs-readonly~1091
X-Git-Url: http://erislabs.org.uk/gitweb/?a=commitdiff_plain;h=35553ad8cc1022a19a677b5634980e822492c83b;p=gnulib.git

Support for copying multibyte string iterators.
Cvs: ----------------------------------------------------------------------
---

diff --git a/ChangeLog b/ChangeLog
index e36c880c5..a763008e5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,15 @@
 2007-02-11  Bruno Haible  <bruno@clisp.org>
 
+	Support for copying multibyte string iterators.
+	* lib/mbiter.h: Include <string.h>.
+	(mbiter_multi_copy): New function.
+	(mbi_copy): New macro.
+	* lib/mbuiter.h: Include <string.h>.
+	(mbuiter_multi_copy): New function.
+	(mbui_copy): New macro.
+
+2007-02-11  Bruno Haible  <bruno@clisp.org>
+
 	New module mbslen.
 	* modules/mbslen: New file.
 	* lib/mbslen.c: New file.
diff --git a/lib/mbiter.h b/lib/mbiter.h
index 92315c56f..5fa8c233f 100644
--- a/lib/mbiter.h
+++ b/lib/mbiter.h
@@ -1,5 +1,5 @@
 /* Iterating through multibyte strings: macros for multi-byte encodings.
-   Copyright (C) 2001, 2005 Free Software Foundation, Inc.
+   Copyright (C) 2001, 2005, 2007 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -65,6 +65,9 @@
    mbi_reloc (iter, ptrdiff)
      relocates iterator when the string is moved by ptrdiff bytes.
 
+   mbi_copy (&destiter, &srciter)
+     copies srciter to destiter.
+
    Here are the function prototypes of the macros.
 
    extern void		mbi_init (mbi_iterator_t iter,
@@ -74,6 +77,7 @@
    extern mbchar_t	mbi_cur (mbi_iterator_t iter);
    extern const char *	mbi_cur_ptr (mbi_iterator_t iter);
    extern void		mbi_reloc (mbi_iterator_t iter, ptrdiff_t ptrdiff);
+   extern void		mbi_copy (mbi_iterator_t *new, const mbi_iterator_t *old);
  */
 
 #ifndef _MBITER_H
@@ -81,6 +85,7 @@
 
 #include <assert.h>
 #include <stdbool.h>
+#include <string.h>
 
 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
    <wchar.h>.
@@ -174,6 +179,18 @@ mbiter_multi_reloc (struct mbiter_multi *iter, ptrdiff_t ptrdiff)
   iter->limit += ptrdiff;
 }
 
+static inline void
+mbiter_multi_copy (struct mbiter_multi *new_iter, const struct mbiter_multi *old_iter)
+{
+  new_iter->limit = old_iter->limit;
+  if ((new_iter->in_shift = old_iter->in_shift))
+    memcpy (&new_iter->state, &old_iter->state, sizeof (mbstate_t));
+  else
+    memset (&new_iter->state, 0, sizeof (mbstate_t));
+  new_iter->next_done = old_iter->next_done;
+  mb_copy (&new_iter->cur, &old_iter->cur);
+}
+
 /* Iteration macros.  */
 typedef struct mbiter_multi mbi_iterator_t;
 #define mbi_init(iter, startptr, length) \
@@ -192,4 +209,7 @@ typedef struct mbiter_multi mbi_iterator_t;
 /* Relocation.  */
 #define mbi_reloc(iter, ptrdiff) mbiter_multi_reloc (&iter, ptrdiff)
 
+/* Copying an iterator.  */
+#define mbi_copy mbiter_multi_copy
+
 #endif /* _MBITER_H */
diff --git a/lib/mbuiter.h b/lib/mbuiter.h
index 9da3a6c79..e6ad4887e 100644
--- a/lib/mbuiter.h
+++ b/lib/mbuiter.h
@@ -1,5 +1,5 @@
 /* Iterating through multibyte strings: macros for multi-byte encodings.
-   Copyright (C) 2001, 2005 Free Software Foundation, Inc.
+   Copyright (C) 2001, 2005, 2007 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -73,6 +73,9 @@
    mbui_reloc (iter, ptrdiff)
      relocates iterator when the string is moved by ptrdiff bytes.
 
+   mbui_copy (&destiter, &srciter)
+     copies srciter to destiter.
+
    Here are the function prototypes of the macros.
 
    extern void		mbui_init (mbui_iterator_t iter, const char *startptr);
@@ -81,6 +84,7 @@
    extern mbchar_t	mbui_cur (mbui_iterator_t iter);
    extern const char *	mbui_cur_ptr (mbui_iterator_t iter);
    extern void		mbui_reloc (mbui_iterator_t iter, ptrdiff_t ptrdiff);
+   extern void		mbui_copy (mbui_iterator_t *new, const mbui_iterator_t *old);
  */
 
 #ifndef _MBUITER_H
@@ -89,6 +93,7 @@
 #include <assert.h>
 #include <stdbool.h>
 #include <stdlib.h>
+#include <string.h>
 
 /* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
    <wchar.h>.
@@ -182,6 +187,17 @@ mbuiter_multi_reloc (struct mbuiter_multi *iter, ptrdiff_t ptrdiff)
   iter->cur.ptr += ptrdiff;
 }
 
+static inline void
+mbuiter_multi_copy (struct mbuiter_multi *new_iter, const struct mbuiter_multi *old_iter)
+{
+  if ((new_iter->in_shift = old_iter->in_shift))
+    memcpy (&new_iter->state, &old_iter->state, sizeof (mbstate_t));
+  else
+    memset (&new_iter->state, 0, sizeof (mbstate_t));
+  new_iter->next_done = old_iter->next_done;
+  mb_copy (&new_iter->cur, &old_iter->cur);
+}
+
 /* Iteration macros.  */
 typedef struct mbuiter_multi mbui_iterator_t;
 #define mbui_init(iter, startptr) \
@@ -200,4 +216,7 @@ typedef struct mbuiter_multi mbui_iterator_t;
 /* Relocation.  */
 #define mbui_reloc(iter, ptrdiff) mbuiter_multi_reloc (&iter, ptrdiff)
 
+/* Copying an iterator.  */
+#define mbui_copy mbuiter_multi_copy
+
 #endif /* _MBUITER_H */