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805e021f CE |
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 | ||
51 | static void | |
52 | simple_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 | ||
61 | ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL | |
62 | vsyslog(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 |