strdup.c

来自「压缩包中包含LINUX下多个命令的源码」· C语言 代码 · 共 48 行

/* Duplicate a string

   Copyright (C) 1996, 2000 Free Software Foundation, Inc.

   Written by Miles Bader <[e-mail]>

   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 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
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_MALLOC_H
#include <malloc.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif

char *
strdup (const char *str)
{
  if (str)
    {
      char *dup = malloc (strlen (str) + 1);
      if (dup)
	strcpy (dup, str);
      return dup;
    }
  else
    return 0;
}