new modules unistr/u{8,16,32}-mbsnlen

[Bruno Haible]

This creates three variants of mbsnlen function for Unicode strings (rather
than multibyte character strings in the locale encoding). They are needed
for Unicode-enabled *printf functions.

2007-06-10  Bruno Haible  <address@hidden>

        * modules/unistr/u32-mbsnlen: New file.
        * lib/unistr/u32-mbsnlen.c: New file.

        * modules/unistr/u16-mbsnlen: New file.
        * lib/unistr/u16-mbsnlen.c: New file.

        * modules/unistr/u8-mbsnlen: New file.
        * lib/unistr/u8-mbsnlen.c: New file.

        * lib/unistr.h (u8_mbsnlen, u16_mbsnlen, u32_mbsnlen): New
        declarations.

*** lib/unistr.h        28 Mar 2007 21:37:36 -0000      1.9
--- lib/unistr.h        11 Jun 2007 00:30:15 -0000
***************
*** 411,416 ****
--- 411,425 ----
  extern uint32_t *
         u32_chr (const uint32_t *s, size_t n, ucs4_t uc);
  
+ /* Count the number of Unicode characters in the N units from S.  */
+ /* Similar to mbsnlen().  */
+ extern size_t
+        u8_mbsnlen (const uint8_t *s, size_t n);
+ extern size_t
+        u16_mbsnlen (const uint16_t *s, size_t n);
+ extern size_t
+        u32_mbsnlen (const uint32_t *s, size_t n);
+ 
  /* Elementary string functions with memory allocation.  */
  
  /* Make a freshly allocated copy of S, of length N.  */

============================= lib/unistr/u8-mbsnlen.c ========================
/* Count characters in UTF-8 string.
   Copyright (C) 2007 Free Software Foundation, Inc.
   Written by Bruno Haible <address@hidden>, 2007.

   This program is free software; you can redistribute it and/or modify it
   under the terms of the GNU Library General Public License as published
   by the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
   USA.  */

#include <config.h>

/* Specification.  */
#include "unistr.h"

size_t
u8_mbsnlen (const uint8_t *s, size_t n)
{
  size_t characters;

  characters = 0;
  while (n > 0)
    {
      int count = u8_mblen (s, n);
      if (count <= 0)
        count = 1;
      s += count;
      n -= count;
      characters++;
    }
  return characters;
}
============================= lib/unistr/u16-mbsnlen.c ========================
/* Count characters in UTF-16 string.
   Copyright (C) 2007 Free Software Foundation, Inc.
   Written by Bruno Haible <address@hidden>, 2007.

   This program is free software; you can redistribute it and/or modify it
   under the terms of the GNU Library General Public License as published
   by the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
   USA.  */

#include <config.h>

/* Specification.  */
#include "unistr.h"

size_t
u16_mbsnlen (const uint16_t *s, size_t n)
{
  size_t characters;

  characters = 0;
  while (n > 0)
    {
      int count = u16_mblen (s, n);
      if (count <= 0)
        count = 1;
      s += count;
      n -= count;
      characters++;
    }
  return characters;
}
============================= lib/unistr/u32-mbsnlen.c ========================
/* Count characters in UTF-32 string.
   Copyright (C) 2007 Free Software Foundation, Inc.
   Written by Bruno Haible <address@hidden>, 2007.

   This program is free software; you can redistribute it and/or modify it
   under the terms of the GNU Library General Public License as published
   by the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
   USA.  */

#include <config.h>

/* Specification.  */
#include "unistr.h"

size_t
u32_mbsnlen (const uint32_t *s, size_t n)
{
  return n;
}
============================= modules/unistr/u8-mbsnlen =======================
Description:
Count characters in UTF-8 string.

Files:
lib/unistr/u8-mbsnlen.c

Depends-on:
unistr/base
unistr/u8-mblen

configure.ac:

Makefile.am:
lib_SOURCES += unistr/u8-mbsnlen.c

Include:
"unistr.h"

License:
LGPL

Maintainer:
Bruno Haible

============================= modules/unistr/u16-mbsnlen =======================
Description:
Count characters in UTF-16 string.

Files:
lib/unistr/u16-mbsnlen.c

Depends-on:
unistr/base
unistr/u16-mblen

configure.ac:

Makefile.am:
lib_SOURCES += unistr/u16-mbsnlen.c

Include:
"unistr.h"

License:
LGPL

Maintainer:
Bruno Haible

============================= modules/unistr/u32-mbsnlen =======================
Description:
Count characters in UTF-32 string.

Files:
lib/unistr/u32-mbsnlen.c

Depends-on:
unistr/base

configure.ac:

Makefile.am:
lib_SOURCES += unistr/u32-mbsnlen.c

Include:
"unistr.h"

License:
LGPL

Maintainer:
Bruno Haible