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zero_pad.c

/*
 *    fhist - file history and comparison tools
 *    Copyright (C) 1998, 2002 Peter Miller;
 *    All rights reserved.
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 *
 * MANIFEST: functions to manipulate zero_pads
 */

#include <mem.h>
#include <str.h>
#include <sub/private.h>
#include <sub/zero_pad.h>
#include <trace.h>
#include <wstr_list.h>


wstring_ty *
sub_zero_pad(sub_context_ty *scp, wstring_list_ty *arg)
{
    wstring_ty      *result;
    string_ty       *s;
    long            n;

    trace(("sub_zero_pad()\n{\n"));
    if (arg->nitems != 3)
    {
      sub_context_error_set(scp, i18n("requires two arguments"));
      trace(("return NULL;\n"));
      trace(("}\n"));
      return 0;
    }
    s = wstr_to_str(arg->item[2]);
    n = atol(s->str_text);
    trace(("n = %ld;\n", n));
    str_free(s);

    if (n <= arg->item[1]->wstr_length)
      result = wstr_copy(arg->item[1]);
    else
    {
      size_t            len;
      char        *buffer;
      string_ty   *s2;
      size_t            j;

      len = n - arg->item[1]->wstr_length;
      s = wstr_to_str(arg->item[1]);
      buffer = mem_alloc(len + 1);
      for (j = 0; j < len; ++j)
          buffer[j] = '0';
      buffer[len] = 0;
      s2 = str_format("%s%S", buffer, s);
      trace(("result = \"%s\";\n", s2->str_text));
      mem_free(buffer);
      str_free(s);
      result = str_to_wstr(s2);
      str_free(s2);
    }
    trace(("return %8.8lX;\n", (long)result));
    trace(("}\n"));
    return result;
}

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