1/*	$NetBSD: context.c,v 1.6 2002/06/14 01:06:52 wiz Exp $	*/
2
3/*
4 * Copyright (c) 1983, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Edward Wang at The University of California, Berkeley.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36#ifndef lint
37#if 0
38static char sccsid[] = "@(#)context.c	8.1 (Berkeley) 6/6/93";
39#else
40__RCSID("$NetBSD: context.c,v 1.6 2002/06/14 01:06:52 wiz Exp $");
41#endif
42#endif /* not lint */
43
44#include <fcntl.h>
45#include <stdlib.h>
46#include "defs.h"
47#include "window_string.h"
48#undef EXTERN
49#define EXTERN
50#include "context.h"
51#undef  EXTERN
52
53/*
54 * Context push/pop for nested command files.
55 */
56int	cx_alloc(void);
57void	cx_free(void);
58
59int
60cx_alloc(void)
61{
62	struct context *xp;
63
64	if (cx.x_type != 0) {
65		xp = (struct context *)
66			malloc((unsigned) sizeof (struct context));
67		if (xp == 0)
68			return -1;
69		*xp = cx;
70		cx.x_link = xp;
71		cx.x_type = 0;
72	}
73	cx.x_erred = 0;
74	cx.x_synerred = 0;
75	cx.x_abort = 0;
76	return 0;
77}
78
79void
80cx_free(void)
81{
82	struct context *xp;
83
84	if ((xp = cx.x_link) != 0) {
85		cx = *xp;
86		free((char *)xp);
87	} else
88		cx.x_type = 0;
89}
90
91int
92cx_beginfile(char *filename)
93{
94	if (cx_alloc() < 0)
95		return -1;
96	cx.x_type = X_FILE;
97	if ((cx.x_filename = str_cpy(filename)) == 0)
98		goto bad;
99	cx.x_fp = fopen(filename, "r");
100	if (cx.x_fp == 0)
101		goto bad;
102	(void) fcntl(fileno(cx.x_fp), F_SETFD, 1);
103	cx.x_bol = 1;
104	cx.x_lineno = 0;
105	cx.x_errwin = 0;
106	cx.x_noerr = 0;
107	return 0;
108bad:
109	if (cx.x_filename != 0)
110		str_free(cx.x_filename);
111	cx_free();
112	return -1;
113}
114
115int
116cx_beginbuf(char *buf, struct value *arg, int narg)
117{
118	if (cx_alloc() < 0)
119		return -1;
120	cx.x_type = X_BUF;
121	cx.x_bufp = cx.x_buf = buf;
122	cx.x_arg = arg;
123	cx.x_narg = narg;
124	return 0;
125}
126
127void
128cx_end(void)
129{
130	switch (cx.x_type) {
131	case X_BUF:
132		break;
133	case X_FILE:
134		(void) fclose(cx.x_fp);
135		str_free(cx.x_filename);
136		break;
137	}
138	cx_free();
139}
140