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 2005 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #include <stddef.h>
28 #include <stdlib.h>
29 #include <stdio.h>
30 #include <stdarg.h>
31 #include <string.h>
32 #include <locale.h>
33 #include <sys/param.h>
34 #include <config_admin.h>
35 #include "mema_util.h"
36
37 /*
38 * The libmemadm routines can return arbitrary error strings. As the
39 * calling program does not know how long these errors might be,
40 * the library routines must allocate the required space and the
41 * calling program must deallocate it.
42 *
43 * This routine povides a printf-like interface for creating the
44 * error strings.
45 */
46
47 #define FMT_STR_SLOP (16)
48
49 void
__fmt_errstring(char ** errstring,size_t extra_length_hint,const char * fmt,...)50 __fmt_errstring(
51 char **errstring,
52 size_t extra_length_hint,
53 const char *fmt,
54 ...)
55 {
56 char *ebuf;
57 size_t elen;
58 va_list ap;
59
60 /*
61 * If no errors required or error already set, return.
62 */
63 if ((errstring == NULL) || (*errstring != NULL))
64 return;
65
66 elen = strlen(fmt) + extra_length_hint + FMT_STR_SLOP;
67
68 if ((ebuf = (char *)malloc(elen + 1)) == NULL)
69 return;
70
71 va_start(ap, fmt);
72 (void) vsprintf(ebuf, fmt, ap);
73 va_end(ap);
74
75 if (strlen(ebuf) > elen)
76 abort();
77
78 *errstring = ebuf;
79 }
80