1 /* $OpenBSD: err.c,v 1.2 2002/06/25 15:50:15 mickey Exp $ */
2
3 /*
4 * log.c
5 *
6 * Based on err.c, which was adapted from OpenBSD libc *err* *warn* code.
7 *
8 * Copyright (c) 2005 Nick Mathewson <nickm@freehaven.net>
9 *
10 * Copyright (c) 2000 Dug Song <dugsong@monkey.org>
11 *
12 * Copyright (c) 1993
13 * The Regents of the University of California. All rights reserved.
14 *
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
17 * are met:
18 * 1. Redistributions of source code must retain the above copyright
19 * notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in the
22 * documentation and/or other materials provided with the distribution.
23 * 3. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 */
39
40 #ifdef HAVE_CONFIG_H
41 #include "config.h"
42 #endif
43
44 #ifdef WIN32
45 #define WIN32_LEAN_AND_MEAN
46 #include <windows.h>
47 #undef WIN32_LEAN_AND_MEAN
48 #include "misc.h"
49 #endif
50 #include <sys/types.h>
51 #include <sys/tree.h>
52 #ifdef HAVE_SYS_TIME_H
53 #include <sys/time.h>
54 #else
55 #include <sys/_time.h>
56 #endif
57 #include <stdio.h>
58 #include <stdlib.h>
59 #include <stdarg.h>
60 #include <string.h>
61 #include <errno.h>
62 #include "event.h"
63
64 #include "log.h"
65
66 static void _warn_helper(int severity, int log_errno, const char *fmt,
67 va_list ap);
68 static void event_log(int severity, const char *msg);
69
70 static int
event_vsnprintf(char * str,size_t size,const char * format,va_list args)71 event_vsnprintf(char *str, size_t size, const char *format, va_list args)
72 {
73 int r;
74 if (size == 0)
75 return -1;
76 #ifdef WIN32
77 r = _vsnprintf(str, size, format, args);
78 #else
79 r = vsnprintf(str, size, format, args);
80 #endif
81 str[size-1] = '\0';
82 if (r < 0 || ((size_t)r) >= size) {
83 /* different platforms behave differently on overflow;
84 * handle both kinds. */
85 return -1;
86 }
87 return r;
88 }
89
90 static int
event_snprintf(char * str,size_t size,const char * format,...)91 event_snprintf(char *str, size_t size, const char *format, ...)
92 {
93 va_list ap;
94 int r;
95 va_start(ap, format);
96 r = event_vsnprintf(str, size, format, ap);
97 va_end(ap);
98 return r;
99 }
100
101 void
event_err(int eval,const char * fmt,...)102 event_err(int eval, const char *fmt, ...)
103 {
104 va_list ap;
105
106 va_start(ap, fmt);
107 _warn_helper(_EVENT_LOG_ERR, errno, fmt, ap);
108 va_end(ap);
109 exit(eval);
110 }
111
112 void
event_warn(const char * fmt,...)113 event_warn(const char *fmt, ...)
114 {
115 va_list ap;
116
117 va_start(ap, fmt);
118 _warn_helper(_EVENT_LOG_WARN, errno, fmt, ap);
119 va_end(ap);
120 }
121
122 void
event_errx(int eval,const char * fmt,...)123 event_errx(int eval, const char *fmt, ...)
124 {
125 va_list ap;
126
127 va_start(ap, fmt);
128 _warn_helper(_EVENT_LOG_ERR, -1, fmt, ap);
129 va_end(ap);
130 exit(eval);
131 }
132
133 void
event_warnx(const char * fmt,...)134 event_warnx(const char *fmt, ...)
135 {
136 va_list ap;
137
138 va_start(ap, fmt);
139 _warn_helper(_EVENT_LOG_WARN, -1, fmt, ap);
140 va_end(ap);
141 }
142
143 void
event_msgx(const char * fmt,...)144 event_msgx(const char *fmt, ...)
145 {
146 va_list ap;
147
148 va_start(ap, fmt);
149 _warn_helper(_EVENT_LOG_MSG, -1, fmt, ap);
150 va_end(ap);
151 }
152
153 void
_event_debugx(const char * fmt,...)154 _event_debugx(const char *fmt, ...)
155 {
156 va_list ap;
157
158 va_start(ap, fmt);
159 _warn_helper(_EVENT_LOG_DEBUG, -1, fmt, ap);
160 va_end(ap);
161 }
162
163 static void
_warn_helper(int severity,int log_errno,const char * fmt,va_list ap)164 _warn_helper(int severity, int log_errno, const char *fmt, va_list ap)
165 {
166 char buf[1024];
167 size_t len;
168
169 if (fmt != NULL)
170 event_vsnprintf(buf, sizeof(buf), fmt, ap);
171 else
172 buf[0] = '\0';
173
174 if (log_errno >= 0) {
175 len = strlen(buf);
176 if (len < sizeof(buf) - 3) {
177 event_snprintf(buf + len, sizeof(buf) - len, ": %s",
178 strerror(log_errno));
179 }
180 }
181
182 event_log(severity, buf);
183 }
184
185 static event_log_cb log_fn = NULL;
186
187 void
event_set_log_callback(event_log_cb cb)188 event_set_log_callback(event_log_cb cb)
189 {
190 log_fn = cb;
191 }
192
193 static void
event_log(int severity,const char * msg)194 event_log(int severity, const char *msg)
195 {
196 if (log_fn)
197 log_fn(severity, msg);
198 else {
199 const char *severity_str;
200 switch (severity) {
201 case _EVENT_LOG_DEBUG:
202 severity_str = "debug";
203 break;
204 case _EVENT_LOG_MSG:
205 severity_str = "msg";
206 break;
207 case _EVENT_LOG_WARN:
208 severity_str = "warn";
209 break;
210 case _EVENT_LOG_ERR:
211 severity_str = "err";
212 break;
213 default:
214 severity_str = "???";
215 break;
216 }
217 (void)fprintf(stderr, "[%s] %s\n", severity_str, msg);
218 }
219 }
220