wcsmbs/mbsncat.c

   1 /* Copyright (C) 1995 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <mbstr.h>
  20 #include <stdlib.h>
  21
  22
  23 /* Append no more than N multi-byte characters from SRC onto DEST.  */
  24 char *
  25 mbsncat (dest, src, n)
  26     char *dest;
  27     const char *src;
  28     size_t n;
  29 {
  30   const char * const d = dest;
  31   const char * const s = src;
  32   size_t len = 0;
  33   int clen = 0;
  34
  35   if (n == 0)
  36     return (char *) d;
  37
  38   /* Reset multibyte characters to their initial state.  */
  39   (void) mblen ((char *) NULL, 0);
  40
  41   do
  42     {
  43       dest += clen;
  44       clen = mblen (dest, MB_CUR_MAX);
  45     }
  46   while (clen > 0);
  47
  48   clen = 0;
  49   do
  50     {
  51       src += clen;
  52       clen = mblen (src, MB_CUR_MAX);
  53     }
  54   while (clen > 0 && ++len < n);
  55
  56   (void) memcpy ((void *) dest, (void *) s, src - s);
  57   dest[src - s] = '\0';     /* '\0' is the multibyte representation of L'\0' */
  58
  59   return (char *) d;
  60 }
  61