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wc.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*                  Copyright (c) 1985-2005 AT&T Corp.                  *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                            by AT&T Corp.                             *
*                                                                      *
*                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

/*
 * NOTE: mbs* and wcs* are provided to avoid link errors only
 */

#include <ast.h>
#include <wchar.h>

#if !_lib_mbtowc
size_t
mbtowc(wchar_t* t, const char* s, size_t n)
{
      if (t && n > 0)
            *t = *s;
      return 1;
}
#endif

#if !_lib_mbrtowc
size_t
mbrtowc(wchar_t* t, const char* s, size_t n, mbstate_t* q)
{
#if _lib_mbtowc
      memset(q, 0, sizeof(*q));
      return mbtowc(t, s, n);
#else
      *q = 0;
      if (t && n > 0)
            *t = *s;
      return 1;
#endif
}
#endif

#if !_lib_mbstowcs
size_t
mbstowcs(wchar_t* t, const char* s, size_t n)
{
      register wchar_t* p = t;
      register wchar_t* e = t + n;
      register unsigned char* u = (unsigned char*)s;

      if (t)
            while (p < e && (*p++ = *u++));
      else
            while (p++, *u++);
      return p - t;
}
#endif

#if !_lib_wctomb
int
wctomb(char* s, wchar_t c)
{
      if (s)
            *s = c;
      return 1;
}
#endif

#if !_lib_wcrtomb
size_t
wcrtomb(char* s, wchar_t c, mbstate_t* q)
{
#if _lib_wctomb
      memset(q, 0, sizeof(*q));
      return wctomb(s, c);
#else
      if (s)
            *s = c;
      *q = 0;
      return 1;
#endif
}
#endif

#if !_lib_wcslen
size_t
wcslen(const wchar_t* s)
{
      register const wchar_t* p = s;

      while (*p)
            p++;
      return p - s;
}
#endif

#if !_lib_wcstombs
size_t
wcstombs(char* t, register const wchar_t* s, size_t n)
{
      register char*          p = t;
      register char*          e = t + n;

      if (t)
            while (p < e && (*p++ = *s++));
      else
            while (p++, *s++);
      return p - t;
}
#endif

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