lib/strndup.c

   1 /* Copyright (C) 1996, 1997, 1998, 2000 Free Software Foundation, Inc.
   2
   3    NOTE: The canonical source of this file is maintained with the GNU C Library.
   4    Bugs can be reported to bug-glibc@prep.ai.mit.edu.
   5
   6    This program is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published by the
   8    Free Software Foundation; either version 2, or (at your option) any
   9    later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software Foundation,
  18    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 # include "config.h"
  22 #endif
  23
  24 #include <stdio.h>
  25 #include <sys/types.h>
  26
  27 #if defined _LIBC || defined STDC_HEADERS
  28 # include <stdlib.h>
  29 # include <string.h>
  30 #else
  31 char *malloc ();
  32 #endif
  33
  34 #ifndef HAVE_DECL_STRNLEN
  35 "this configure-time declaration test was not run"
  36 #endif
  37 #if !HAVE_DECL_STRNLEN
  38 size_t strnlen ();
  39 #endif
  40
  41 #undef __strndup
  42 #undef strndup
  43
  44 #ifndef weak_alias
  45 # define __strndup strndup
  46 #endif
  47
  48 char *
  49 __strndup (const char *s, size_t n)
  50 {
  51   size_t len = strnlen (s, n);
  52   char *new = malloc (len + 1);
  53
  54   if (new == NULL)
  55     return NULL;
  56
  57   new[len] = '\0';
  58   return (char *) memcpy (new, s, len);
  59 }
  60 #ifdef weak_alias
  61 weak_alias (__strndup, strndup)
  62 #endif