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strlcat.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2007 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped
/*
 * strlcat implementation
 */

#define strlcat         ______strlcat

#include <ast.h>

#undef      strlcat

#undef      _def_map_ast
#include <ast_map.h>

#if _lib_strlcat

NoN(strlcat)

#else

/*
 * append at t onto s limiting total size of s to n
 * s 0 terminated if n>0
 * min(n,strlen(s))+strlen(t) returned
 */

#if defined(__EXPORT__)
#define extern    __EXPORT__
#endif

extern size_t
strlcat(register char* s, register const char* t, register size_t n)
{
      const char* o = t;

      if (n)
      {
            while (--n && *s)
                  s++;
            if (n)
                  do
                  {
                        if (!--n)
                        {
                              *s = 0;
                              break;
                        }
                  } while (*s++ = *t++);
            else
                  *s = 0;
      }
      if (!n)
            while (*t++);
      return t - o - 1;
}

#endif

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