contrib/libevent/log.c

   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
  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
  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
 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
 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
 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
 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
 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
 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
 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
 188 event_set_log_callback(event_log_cb cb)
 189 {
 190         log_fn = cb;
 191 }
 192
 193 static void
 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 }