xref: /illumos-gate/usr/src/cmd/ypcmd/revnetgroup/util.c (revision 6a634c9dca3093f3922e4b7ab826d7bdf17bf78e)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright (c) 1990, 2010, Oracle and/or its affiliates. All rights reserved.
24  */
25 
26 #include <stdio.h>
27 #include <string.h>
28 #include "util.h"
29 
30 
31 
32 
33 /*
34  * This is just like fgets, but recognizes that "\\n" signals a continuation
35  * of a line
36  */
37 char *
getaline(line,maxlen,fp)38 getaline(line, maxlen, fp)
39 	char *line;
40 	int maxlen;
41 	FILE *fp;
42 {
43 	register char *p;
44 	register char *start;
45 	int c;
46 
47 	start = line;
48 
49 nextline:
50 	if (fgets(start, maxlen, fp) == NULL) {
51 		return (NULL);
52 	}
53 	for (p = start; *p; p++) {
54 		if (*p == '\n') {
55 			if (p > start && *(p-1) == '\\') {
56 				start = p - 1;
57 				maxlen++;
58 				goto nextline;
59 			} else {
60 				return (line);
61 			}
62 		}
63 		maxlen--;
64 	}
65 
66 	/*
67 	 * Input line is too long. Rest of the line needs to be discarded.
68 	 * Reinsert the last char into the stream. This is done so that
69 	 * in case the last char read is '\' and it is followed by a '\n'
70 	 * then the next line too can be discarded.
71 	 */
72 	if (p > start)
73 		(void) ungetc(*(p-1), fp);
74 
75 	/*
76 	 * Discard the rest of the line
77 	 */
78 	while ((c = getc(fp)) != EOF) {
79 		if (c == '\n')
80 			break;
81 		else if (c == '\\') {
82 			/*
83 			 * Ignore the next character except EOF
84 			 */
85 			if (getc(fp) == EOF)
86 				break;
87 		}
88 	}
89 
90 	maxlen = strlen(line) + 1;
91 
92 	/*
93 	 * Certain functions expects a newline in the buffer.
94 	 */
95 	if (maxlen >= 2)
96 		line[maxlen - 2] = '\n';
97 	(void) fprintf(stderr, "Following line too long - remaining chars "
98 			"ignored\n--- %s", line);
99 	return (line);
100 }
101 
102 
103 void
fatal(message)104 fatal(message)
105 	char *message;
106 {
107 	(void) fprintf(stderr, "fatal error: %s\n", message);
108 	exit(1);
109 }
110