1 /* @(#)context.c 8.1 (Berkeley) 6/6/93 */
2 /* $NetBSD: context.c,v 1.7 2003/08/07 11:17:24 agc Exp $ */
3
4 /*
5 * Copyright (c) 1983, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Edward Wang at The University of California, Berkeley.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include <fcntl.h>
37 #include <stdlib.h>
38 #include "defs.h"
39 #include "window_string.h"
40 #undef EXTERN
41 #define EXTERN
42 #include "context.h"
43 #undef EXTERN
44
45 /*
46 * Context push/pop for nested command files.
47 */
48 int cx_alloc(void);
49 void cx_free(void);
50
51 int
cx_alloc(void)52 cx_alloc(void)
53 {
54 struct context *xp;
55
56 if (cx.x_type != 0) {
57 xp = (struct context *)
58 malloc((unsigned) sizeof (struct context));
59 if (xp == NULL)
60 return -1;
61 *xp = cx;
62 cx.x_link = xp;
63 cx.x_type = 0;
64 }
65 cx.x_erred = 0;
66 cx.x_synerred = 0;
67 cx.x_abort = 0;
68 return 0;
69 }
70
71 void
cx_free(void)72 cx_free(void)
73 {
74 struct context *xp;
75
76 if ((xp = cx.x_link) != NULL) {
77 cx = *xp;
78 free((char *)xp);
79 } else
80 cx.x_type = 0;
81 }
82
83 int
cx_beginfile(char * filename)84 cx_beginfile(char *filename)
85 {
86 if (cx_alloc() < 0)
87 return -1;
88 cx.x_type = X_FILE;
89 if ((cx.x_filename = str_cpy(filename)) == 0)
90 goto bad;
91 cx.x_fp = fopen(filename, "r");
92 if (cx.x_fp == 0)
93 goto bad;
94 (void) fcntl(fileno(cx.x_fp), F_SETFD, 1);
95 cx.x_bol = 1;
96 cx.x_lineno = 0;
97 cx.x_errwin = 0;
98 cx.x_noerr = 0;
99 return 0;
100 bad:
101 if (cx.x_filename != 0)
102 str_free(cx.x_filename);
103 cx_free();
104 return -1;
105 }
106
107 int
cx_beginbuf(char * buf,struct value * arg,int narg)108 cx_beginbuf(char *buf, struct value *arg, int narg)
109 {
110 if (cx_alloc() < 0)
111 return -1;
112 cx.x_type = X_BUF;
113 cx.x_bufp = cx.x_buf = buf;
114 cx.x_arg = arg;
115 cx.x_narg = narg;
116 return 0;
117 }
118
119 void
cx_end(void)120 cx_end(void)
121 {
122 switch (cx.x_type) {
123 case X_BUF:
124 break;
125 case X_FILE:
126 (void) fclose(cx.x_fp);
127 str_free(cx.x_filename);
128 break;
129 }
130 cx_free();
131 }
132