exrewind.c   [plain text]

#pragma prototyped
/*
 * Glenn Fowler
 * AT&T Research
 *
 * expression library
 */

#include "exlib.h"
#include <string.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)))
	{
		exerror("out of space [rewind]");
		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);
}