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Sourcecode: fhist version File versions

date.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 dates
 */

#include <ac/time.h>

#include <language.h>
#include <str.h>
#include <sub/date.h>
#include <sub/private.h>
#include <trace.h>
#include <wstr_list.h>


/*
 * NAME
 *    sub_date - the date substitution
 *
 * SYNOPSIS
 *    wstring_ty *sub_date(wstring_list_ty *arg);
 *
 * DESCRIPTION
 *    The sub_date function implements the date substitution.
 *    The date substitution is replaced by the current date.
 *    The optional arguments may construct format string,
 *    similar to the date(1) command.
 *
 * ARGUMENTS
 *    arg   - list of arguments, including the function name as [0]
 *
 * RETURNS
 *    a pointer to a string in dynamic memory;
 *    or NULL on error, setting suberr appropriately.
 */

wstring_ty *
sub_date(sub_context_ty *scp, wstring_list_ty *arg)
{
    wstring_ty      *result;
    time_t          now;

    trace(("sub_date()\n{\n"));
    time(&now);
    if (arg->nitems < 2)
    {
      char            *time_string;

      time_string = ctime(&now);
      result = wstr_n_from_c(time_string, 24);
    }
    else
    {
      struct tm   *tm;
      char        buf[1000];
      size_t            nbytes;
      wstring_ty  *wfmt;
      string_ty   *fmt;

      wfmt = wstring_list_to_wstring(arg, 1, 32767, (char *)0);
      fmt = wstr_to_str(wfmt);
      wstr_free(wfmt);
      tm = localtime(&now);

      /*
       * The strftime is locale dependent.
       */
      language_human();
      nbytes = strftime(buf, sizeof(buf) - 1, fmt->str_text, tm);
      language_C();

      if (!nbytes && fmt->str_length)
      {
          sub_context_error_set(scp, i18n("strftime output too large"));
          result = 0;
      }
      else
          result = wstr_n_from_c(buf, nbytes);
      str_free(fmt);
    }
    trace(("return %8.8lX;\n", (long)result));
    trace(("}\n"));
    return result;
}

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