usr/src/lib/libast/common/string/strlcpy.c

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
   5 *                      and is licensed under the                       *
   6 *                  Common Public License, Version 1.0                  *
   7 *                    by AT&T Intellectual Property                     *
   8 *                                                                      *
   9 *                A copy of the License is available at                 *
  10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
  11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
  12 *                                                                      *
  13 *              Information and Software Systems Research               *
  14 *                            AT&T Research                             *
  15 *                           Florham Park NJ                            *
  16 *                                                                      *
  17 *                 Glenn Fowler <gsf@research.att.com>                  *
  18 *                  David Korn <dgk@research.att.com>                   *
  19 *                   Phong Vo <kpv@research.att.com>                    *
  20 *                                                                      *
  21 ***********************************************************************/
  22 #pragma prototyped
  23 /*
  24  * strlcpy implementation
  25  */
  26
  27 #define strlcpy         ______strlcpy
  28
  29 #include <ast.h>
  30
  31 #undef  strlcpy
  32
  33 #undef  _def_map_ast
  34 #include <ast_map.h>
  35
  36 #if _lib_strlcpy
  37
  38 NoN(strlcpy)
  39
  40 #else
  41
  42 /*
  43  * copy at most n chars from t into s
  44  * result 0 terminated if n>0
  45  * strlen(t) returned
  46  */
  47
  48 #if defined(__EXPORT__)
  49 #define extern  __EXPORT__
  50 #endif
  51
  52 extern size_t
  53 strlcpy(register char* s, register const char* t, register size_t n)
  54 {
  55         const char*     o = t;
  56
  57         if (n)
  58                 do
  59                 {
  60                         if (!--n)
  61                         {
  62                                 *s = 0;
  63                                 break;
  64                         }
  65                 } while (*s++ = *t++);
  66         if (!n)
  67                 while (*t++);
  68         return t - o - 1;
  69 }
  70
  71 #endif