util.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
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, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright (c) 1996-2001 by Sun Microsystems, Inc.
24 * All rights reserved.
25 */
26
27#pragma ident	"%Z%%M%	%I%	%E% SMI"	/* SMI4.1 1.4 */
28
29#include <stdio.h>
30#include <string.h>
31#include "util.h"
32
33
34
35
36/*
37 * This is just like fgets, but recognizes that "\\n" signals a continuation
38 * of a line
39 */
40char *
41getline(line, maxlen, fp)
42	char *line;
43	int maxlen;
44	FILE *fp;
45{
46	register char *p;
47	register char *start;
48	int c;
49
50	start = line;
51
52nextline:
53	if (fgets(start, maxlen, fp) == NULL) {
54		return (NULL);
55	}
56	for (p = start; *p; p++) {
57		if (*p == '\n') {
58			if (p > start && *(p-1) == '\\') {
59				start = p - 1;
60				maxlen++;
61				goto nextline;
62			} else {
63				return (line);
64			}
65		}
66		maxlen--;
67	}
68
69	/*
70	 * Input line is too long. Rest of the line needs to be discarded.
71	 * Reinsert the last char into the stream. This is done so that
72	 * in case the last char read is '\' and it is followed by a '\n'
73	 * then the next line too can be discarded.
74	 */
75	if (p > start)
76		(void) ungetc(*(p-1), fp);
77
78	/*
79	 * Discard the rest of the line
80	 */
81	while ((c = getc(fp)) != EOF) {
82		if (c == '\n')
83			break;
84		else if (c == '\\') {
85			/*
86			 * Ignore the next character except EOF
87			 */
88			if (getc(fp) == EOF)
89				break;
90		}
91	}
92
93	maxlen = strlen(line) + 1;
94
95	/*
96	 * Certain functions expects a newline in the buffer.
97	 */
98	if (maxlen >= 2)
99		line[maxlen - 2] = '\n';
100	(void) fprintf(stderr, "Following line too long - remaining chars "
101			"ignored\n--- %s", line);
102	return (line);
103}
104
105
106void
107fatal(message)
108	char *message;
109{
110	(void) fprintf(stderr, "fatal error: %s\n", message);
111	exit(1);
112}
113