xref: /freebsd/crypto/heimdal/lib/roken/vsyslog.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
1 /*
2  * Copyright (c) 1995 - 2000 Kungliga Tekniska H�gskolan
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 #ifdef HAVE_CONFIG_H
35 #include <config.h>
36 RCSID("$Id: vsyslog.c,v 1.6 2000/05/22 22:09:25 assar Exp $");
37 #endif
38 
39 #ifndef HAVE_VSYSLOG
40 
41 #include <stdio.h>
42 #include <syslog.h>
43 #include <stdarg.h>
44 
45 #include "roken.h"
46 
47 /*
48  * the theory behind this is that we might be trying to call vsyslog
49  * when there's no memory left, and we should try to be as useful as
50  * possible.  And the format string should say something about what's
51  * failing.
52  */
53 
54 static void
55 simple_vsyslog(int pri, const char *fmt, va_list ap)
56 {
57     syslog (pri, "%s", fmt);
58 }
59 
60 /*
61  * do like syslog but with a `va_list'
62  */
63 
64 void
65 vsyslog(int pri, const char *fmt, va_list ap)
66 {
67     char *fmt2;
68     const char *p;
69     char *p2;
70     int saved_errno = errno;
71     int fmt_len  = strlen (fmt);
72     int fmt2_len = fmt_len;
73     char *buf;
74 
75     fmt2 = malloc (fmt_len + 1);
76     if (fmt2 == NULL) {
77 	simple_vsyslog (pri, fmt, ap);
78 	return;
79     }
80 
81     for (p = fmt, p2 = fmt2; *p != '\0'; ++p) {
82 	if (p[0] == '%' && p[1] == 'm') {
83 	    const char *e = strerror (saved_errno);
84 	    int e_len = strlen (e);
85 	    char *tmp;
86 	    int pos;
87 
88 	    pos = p2 - fmt2;
89 	    fmt2_len += e_len - 2;
90 	    tmp = realloc (fmt2, fmt2_len + 1);
91 	    if (tmp == NULL) {
92 		free (fmt2);
93 		simple_vsyslog (pri, fmt, ap);
94 		return;
95 	    }
96 	    fmt2 = tmp;
97 	    p2   = fmt2 + pos;
98 	    memmove (p2, e, e_len);
99 	    p2 += e_len;
100 	    ++p;
101 	} else
102 	    *p2++ = *p;
103     }
104     *p2 = '\0';
105 
106     vasprintf (&buf, fmt2, ap);
107     free (fmt2);
108     if (buf == NULL) {
109 	simple_vsyslog (pri, fmt, ap);
110 	return;
111     }
112     syslog (pri, "%s", buf);
113     free (buf);
114 }
115 #endif
116