exrewind.c revision 3f54fd611f536639ec30dd53c48e5ec1897cc7d9
/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1989-2011 AT&T Intellectual Property *
* and is licensed under the *
* Eclipse Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.eclipse.org/org/documents/epl-v10.html *
* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
* *
* 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);
}