source: heimdal/trunk/lib/roken/vsyslog.c@ 4

Last change on this file since 4 was 1, checked in by Paul Smedley, 10 years ago

Initial commit of Heimdal 1.5.3
File size: 3.1 KB
Line 
1/*
2 * Copyright (c) 1995 - 2000 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <config.h>
35
36#ifndef HAVE_VSYSLOG
37
38#include <stdio.h>
39#include <syslog.h>
40#include <stdarg.h>
41
42#include "roken.h"
43
44/*
45 * the theory behind this is that we might be trying to call vsyslog
46 * when there's no memory left, and we should try to be as useful as
47 * possible. And the format string should say something about what's
48 * failing.
49 */
50
51static void
52simple_vsyslog(int pri, const char *fmt, va_list ap)
53{
54 syslog (pri, "%s", fmt);
55}
56
57/*
58 * do like syslog but with a `va_list'
59 */
60
61ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
62vsyslog(int pri, const char *fmt, va_list ap)
63{
64 char *fmt2;
65 const char *p;
66 char *p2;
67 int ret;
68 int saved_errno = errno;
69 int fmt_len = strlen (fmt);
70 int fmt2_len = fmt_len;
71 char *buf;
72
73 fmt2 = malloc (fmt_len + 1);
74 if (fmt2 == NULL) {
75 simple_vsyslog (pri, fmt, ap);
76 return;
77 }
78
79 for (p = fmt, p2 = fmt2; *p != '\0'; ++p) {
80 if (p[0] == '%' && p[1] == 'm') {
81 const char *e = strerror (saved_errno);
82 int e_len = strlen (e);
83 char *tmp;
84 int pos;
85
86 pos = p2 - fmt2;
87 fmt2_len += e_len - 2;
88 tmp = realloc (fmt2, fmt2_len + 1);
89 if (tmp == NULL) {
90 free (fmt2);
91 simple_vsyslog (pri, fmt, ap);
92 return;
93 }
94 fmt2 = tmp;
95 p2 = fmt2 + pos;
96 memmove (p2, e, e_len);
97 p2 += e_len;
98 ++p;
99 } else
100 *p2++ = *p;
101 }
102 *p2 = '\0';
103
104 ret = vasprintf (&buf, fmt2, ap);
105 free (fmt2);
106 if (ret < 0 || buf == NULL) {
107 simple_vsyslog (pri, fmt, ap);
108 return;
109 }
110 syslog (pri, "%s", buf);
111 free (buf);
112}
113#endif
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