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exrewind.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1989-2007 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                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>                  *
*                                                                      *
***********************************************************************/
#pragma prototyped
/*
 * Glenn Fowler
 * AT&T Research
 *
 * expression library
 */

#include "exlib.h"

int
exrewind(Expr_t* ex)
{
      register int      n;

      if (ex->linewrap)
      {
            exerror("too much pushback");
            return -1;
      }
      if (!ex->input->pushback && !(ex->input->pushback = oldof(0, char, sizeof(ex->line), 3)))
      {
            exnospace();
            return -1;
      }
      if (n = ex->linep - ex->line)
            memcpy(ex->input->pushback, ex->line, n);
      if (ex->input->peek)
      {
            ex->input->pushback[n++] = ex->input->peek;
            ex->input->peek = 0;
      }
      ex->input->pushback[n++] = ' ';
      ex->input->pushback[n] = 0;
      ex->input->pp = ex->input->pushback;
      ex->input->nesting = ex->nesting;
      setcontext(ex);
      return 0;
}

void
exstatement(Expr_t* ex)
{
      ex->nesting = ex->input->nesting;
      setcontext(ex);
}

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