text: /****************************************************************************
   * Copyright (c) 1998-2012,2019 Free Software Foundation, Inc.              *
   *                                                                          *
   * Permission is hereby granted, free of charge, to any person obtaining a  *
   * copy of this software and associated documentation files (the            *
   * "Software"), to deal in the Software without restriction, including      *
   * without limitation the rights to use, copy, modify, merge, publish,      *
   * distribute, distribute with modifications, sublicense, and/or sell       *
   * copies of the Software, and to permit persons to whom the Software is    *
   * furnished to do so, subject to the following conditions:                 *
   *                                                                          *
   * The above copyright notice and this permission notice shall be included  *
   * in all copies or substantial portions of the Software.                   *
   *                                                                          *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
   * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
   * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
   * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
   * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
   * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
   * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
   *                                                                          *
   * Except as contained in this notice, the name(s) of the above copyright   *
   * holders shall not be used in advertising or otherwise to promote the     *
   * sale, use or other dealings in this Software without prior written       *
   * authorization.                                                           *
   ****************************************************************************/
  
  /****************************************************************************
   *  Author: Juergen Pfeifer                                                 *
   *     and: Thomas E. Dickey                                                *
   ****************************************************************************/
  
  /*
   *	lib_slkset.c
   *      Set soft label text.
   */
  #include <curses.priv.h>
  #include <ctype.h>
  
  #if USE_WIDEC_SUPPORT
  #if HAVE_WCTYPE_H
  #include <wctype.h>
  #endif
  #endif
  
  MODULE_ID("$Id: lib_slkset.c,v 1.25 2019/05/04 20:46:24 tom Exp $")
  
  NCURSES_EXPORT(int)
  NCURSES_SP_NAME(slk_set) (NCURSES_SP_DCLx int i, const char *astr, int format)
  {
      SLK *slk;
      int offset = 0;
      int numchrs;
      int numcols;
      int limit;
      const char *str = astr;
      const char *p;
  
      T((T_CALLED("slk_set(%p, %d, \"%s\", %d)"), (void *) SP_PARM, i, str, format));
  
      if (SP_PARM == 0
  	|| (slk = SP_PARM->_slk) == 0
  	|| i < 1
  	|| i > slk->labcnt
  	|| format < 0
  	|| format > 2)
  	returnCode(ERR);
      if (str == 0)
  	str = "";
      --i;			/* Adjust numbering of labels */
  
      limit = MAX_SKEY_LEN(SP_PARM->slk_format);
      while (isspace(UChar(*str)))
  	str++;			/* skip over leading spaces  */
      p = str;
  
  #if USE_WIDEC_SUPPORT
      numcols = 0;
      while (*p != 0) {
  	mbstate_t state;
  	wchar_t wc;
  	size_t need;
  
  	init_mb(state);
  	need = mbrtowc(0, p, strlen(p), &state);
  	if (need == (size_t) -1)
  	    break;
  	mbrtowc(&wc, p, need, &state);
  	if (!iswprint((wint_t) wc))
  	    break;
  	if (_nc_wacs_width(wc) + numcols > limit)
  	    break;
  	numcols += _nc_wacs_width(wc);
  	p += need;
      }
      numchrs = (int) (p - str);
  #else
      while (isprint(UChar(*p)))
  	p++;			/* The first non-print stops */
  
      numcols = (int) (p - str);
      if (numcols > limit)
  	numcols = limit;
      numchrs = numcols;
  #endif
  
      FreeIfNeeded(slk->ent[i].ent_text);
      if ((slk->ent[i].ent_text = strdup(str)) == 0)
  	returnCode(ERR);
      slk->ent[i].ent_text[numchrs] = '\0';
  
      if ((slk->ent[i].form_text = (char *) _nc_doalloc(slk->ent[i].form_text,
  						      (size_t) (limit +
  								numchrs + 1))
  	) == 0)
  	returnCode(ERR);
  
      switch (format) {
      case 0:			/* left-justified */
  	offset = 0;
  	break;
      case 1:			/* centered */
  	offset = (limit - numcols) / 2;
  	break;
      case 2:			/* right-justified */
  	offset = limit - numcols;
  	break;
      }
      if (offset <= 0)
  	offset = 0;
      else
  	memset(slk->ent[i].form_text, ' ', (size_t) offset);
  
      memcpy(slk->ent[i].form_text + offset,
  	   slk->ent[i].ent_text,
  	   (size_t) numchrs);
  
      if (offset < limit) {
  	memset(slk->ent[i].form_text + offset + numchrs,
  	       ' ',
  	       (size_t) (limit - (offset + numcols)));
      }
  
      slk->ent[i].form_text[numchrs - numcols + limit] = 0;
      slk->ent[i].dirty = TRUE;
      returnCode(OK);
  }
  
  #if NCURSES_SP_FUNCS
  NCURSES_EXPORT(int)
  slk_set(int i, const char *astr, int format)
  {
      return NCURSES_SP_NAME(slk_set) (CURRENT_SCREEN, i, astr, format);
  }
  #endif
  