/*      @(#)context.c   8.1 (Berkeley) 6/6/93   */
/*      $NetBSD: context.c,v 1.7 2003/08/07 11:17:24 agc Exp $  */

/*
 * Copyright (c) 1983, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Edward Wang at The University of California, Berkeley.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <fcntl.h>
#include <stdlib.h>
#include "defs.h"
#include "window_string.h"
#undef EXTERN
#define EXTERN
#include "context.h"
#undef  EXTERN

/*
 * Context push/pop for nested command files.
 */
int     cx_alloc(void);
void    cx_free(void);

int
cx_alloc(void)
{
        struct context *xp;

        if (cx.x_type != 0) {
                xp = (struct context *)
                        malloc((unsigned) sizeof (struct context));
                if (xp == NULL)
                        return -1;
                *xp = cx;
                cx.x_link = xp;
                cx.x_type = 0;
        }
        cx.x_erred = 0;
        cx.x_synerred = 0;
        cx.x_abort = 0;
        return 0;
}

void
cx_free(void)
{
        struct context *xp;

        if ((xp = cx.x_link) != NULL) {
                cx = *xp;
                free((char *)xp);
        } else
                cx.x_type = 0;
}

int
cx_beginfile(char *filename)
{
        if (cx_alloc() < 0)
                return -1;
        cx.x_type = X_FILE;
        if ((cx.x_filename = str_cpy(filename)) == 0)
                goto bad;
        cx.x_fp = fopen(filename, "r");
        if (cx.x_fp == 0)
                goto bad;
        (void) fcntl(fileno(cx.x_fp), F_SETFD, 1);
        cx.x_bol = 1;
        cx.x_lineno = 0;
        cx.x_errwin = 0;
        cx.x_noerr = 0;
        return 0;
bad:
        if (cx.x_filename != 0)
                str_free(cx.x_filename);
        cx_free();
        return -1;
}

int
cx_beginbuf(char *buf, struct value *arg, int narg)
{
        if (cx_alloc() < 0)
                return -1;
        cx.x_type = X_BUF;
        cx.x_bufp = cx.x_buf = buf;
        cx.x_arg = arg;
        cx.x_narg = narg;
        return 0;
}

void
cx_end(void)
{
        switch (cx.x_type) {
        case X_BUF:
                break;
        case X_FILE:
                (void) fclose(cx.x_fp);
                str_free(cx.x_filename);
                break;
        }
        cx_free();
}