src/lib/logger.c

   1 /**
   2  *  Copyright (C) 2011-2012  Juho Vähä-Herttua
   3  *
   4  *  This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Lesser General Public
   6  *  License as published by the Free Software Foundation; either
   7  *  version 2.1 of the License, or (at your option) any later version.
   8  *
   9  *  This library is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  Lesser General Public License for more details.
  13  */
  14
  15 #include <stdlib.h>
  16 #include <stdio.h>
  17 #include <stdarg.h>
  18 #include <assert.h>
  19
  20 #include "logger.h"
  21
  22 void
  23 logger_init(logger_t *logger)
  24 {
  25         assert(logger);
  26
  27         logger->level = LOGGER_INFO;
  28         logger->callback = NULL;
  29 }
  30
  31 void
  32 logger_set_level(logger_t *logger, int level)
  33 {
  34         assert(logger);
  35
  36         logger->level = level;
  37 }
  38
  39 void
  40 logger_set_callback(logger_t *logger, logger_callback_t callback)
  41 {
  42         assert(logger);
  43
  44         logger->callback = callback;
  45 }
  46
  47 static char *
  48 logger_utf8_to_local(const char *str)
  49 {
  50         char *ret = NULL;
  51
  52 /* FIXME: This is only implemented on Windows for now */
  53 #if defined(_WIN32) || defined(_WIN64)
  54         int wclen, mblen;
  55         WCHAR *wcstr;
  56         BOOL failed;
  57
  58         wclen = MultiByteToWideChar(CP_UTF8, 0, str, -1, NULL, 0);
  59         wcstr = malloc(sizeof(WCHAR) * wclen);
  60         MultiByteToWideChar(CP_UTF8, 0, str, -1, wcstr, wclen);
  61
  62         mblen = WideCharToMultiByte(CP_ACP, 0, wcstr, wclen, NULL, 0, NULL, &failed);
  63         if (failed) {
  64                 /* Invalid characters in input, conversion failed */
  65                 free(wcstr);
  66                 return NULL;
  67         }
  68
  69         ret = malloc(sizeof(CHAR) * mblen);
  70         WideCharToMultiByte(CP_ACP, 0, wcstr, wclen, ret, mblen, NULL, NULL);
  71         free(wcstr);
  72 #endif
  73
  74         return ret;
  75 }
  76
  77 void
  78 logger_log(logger_t *logger, int level, const char *fmt, ...)
  79 {
  80         char buffer[4096];
  81         va_list ap;
  82
  83         if (level > logger->level)
  84                 return;
  85
  86         buffer[sizeof(buffer)-1] = '\0';
  87         va_start(ap, fmt);
  88         vsnprintf(buffer, sizeof(buffer)-1, fmt, ap);
  89         va_end(ap);
  90
  91         if (logger->callback) {
  92                 logger->callback(level, buffer);
  93         } else {
  94                 char *local = logger_utf8_to_local(buffer);
  95
  96                 if (local) {
  97                         fprintf(stderr, "%s", local);
  98                         free(local);
  99                 } else {
 100                         fprintf(stderr, "%s", buffer);
 101                 }
 102         }
 103 }
 104