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
114