StdLib: Revise the meaning of several feature macros.

[mirror_edk2.git] / StdLib / LibC / String / strlcpy.c

/*  $NetBSD: strlcpy.c,v 1.3 2007/06/04 18:19:27 christos Exp $ */\r
/*  $OpenBSD: strlcpy.c,v 1.7 2003/04/12 21:56:39 millert Exp $ */\r
\r
/*\r
 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>\r
 *\r
 * Permission to use, copy, modify, and distribute this software for any\r
 * purpose with or without fee is hereby granted, provided that the above\r
 * copyright notice and this permission notice appear in all copies.\r
 *\r
 * THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL\r
 * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES\r
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE\r
 * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES\r
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION\r
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN\r
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.\r
 */\r
#include  <LibConfig.h>\r
\r
#if !defined(_KERNEL) && !defined(_STANDALONE)\r
#if HAVE_NBTOOL_CONFIG_H\r
#include "nbtool_config.h"\r
#endif\r
\r
#include <sys/cdefs.h>\r
#if defined(LIBC_SCCS) && !defined(lint)\r
__RCSID("$NetBSD: strlcpy.c,v 1.3 2007/06/04 18:19:27 christos Exp $");\r
#endif /* LIBC_SCCS and not lint */\r
\r
#ifdef _LIBC\r
#include "namespace.h"\r
#endif\r
#include <sys/types.h>\r
#include <assert.h>\r
#include <string.h>\r
\r
#ifdef _LIBC\r
# ifdef __weak_alias\r
__weak_alias(strlcpy, _strlcpy)\r
# endif\r
#endif\r
#else\r
#include <lib/libkern/libkern.h>\r
#endif /* !_KERNEL && !_STANDALONE */\r
\r
\r
#if !HAVE_STRLCPY\r
/*\r
 * Copy src to string dst of size siz.  At most siz-1 characters\r
 * will be copied.  Always NUL terminates (unless siz == 0).\r
 * Returns strlen(src); if retval >= siz, truncation occurred.\r
 */\r
size_t\r
strlcpy(char *dst, const char *src, size_t siz)\r
{\r
  char *d = dst;\r
  const char *s = src;\r
  size_t n = siz;\r
\r
  _DIAGASSERT(dst != NULL);\r
  _DIAGASSERT(src != NULL);\r
\r
  /* Copy as many bytes as will fit */\r
  if (n != 0 && --n != 0) {\r
    do {\r
      if ((*d++ = *s++) == 0)\r
        break;\r
    } while (--n != 0);\r
  }\r
\r
  /* Not enough room in dst, add NUL and traverse rest of src */\r
  if (n == 0) {\r
    if (siz != 0)\r
      *d = '\0';    /* NUL-terminate dst */\r
    while (*s++)\r
      ;\r
  }\r
\r
  return(s - src - 1);  /* count does not include NUL */\r
}\r
#endif\r