src/helper/log.c

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include "log.h"
  25 #include "configuration.h"
  26
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <stdarg.h>
  31
  32 int debug_level = -1;
  33
  34 static FILE* log_output;
  35
  36
  37 static void *privData;
  38 static logCallback callback;
  39
  40 void log_setCallback(logCallback c, void *p)
  41 {
  42         callback=c;
  43         privData=p;
  44 }
  45
  46 static char *log_strings[4] =
  47 {
  48         "Error:  ",
  49         "Warning:",
  50         "Info:   ",
  51         "Debug:  ",
  52 };
  53
  54 void log_printf(enum log_levels level, const char *file, int line, const char *function, const char *format, ...)
  55 {
  56         va_list args;
  57         char buffer[512];
  58
  59         if (level > debug_level)
  60                 return;
  61
  62         va_start(args, format);
  63         vsnprintf(buffer, 512, format, args);
  64
  65         fprintf(log_output, "%s %s:%d %s(): %s\n", log_strings[level], file, line, function, buffer);
  66         fflush(log_output);
  67
  68         va_end(args);
  69
  70         if (callback)
  71 {
  72         va_start(args, format);
  73
  74                 callback(privData, file, line, function, format, args);
  75
  76         va_end(args);
  77 }
  78
  79 }
  80
  81 /* change the current debug level on the fly
  82  * 0: only ERRORS
  83  * 1: + WARNINGS
  84  * 2: + INFORMATIONAL MSGS
  85  * 3: + DEBUG MSGS
  86  */
  87 int handle_debug_level_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
  88 {
  89         if (argc == 0)
  90                 command_print(cmd_ctx, "debug_level: %i", debug_level);
  91
  92         if (argc > 0)
  93                 debug_level = strtoul(args[0], NULL, 0);
  94
  95         if (debug_level < 0)
  96                 debug_level = 0;
  97
  98         if (debug_level > 3)
  99                 debug_level = 3;
 100
 101         return ERROR_OK;
 102 }
 103
 104 int handle_log_output_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 105 {
 106         if (argc == 1)
 107         {
 108                 FILE* file = fopen(args[0], "w");
 109
 110                 if (file)
 111                 {
 112                         log_output = file;
 113                 }
 114         }
 115
 116         return ERROR_OK;
 117 }
 118
 119 int log_register_commands(struct command_context_s *cmd_ctx)
 120 {
 121         register_command(cmd_ctx, NULL, "log_output", handle_log_output_command,
 122                 COMMAND_ANY, "redirect logging to <file> (default: stderr)");
 123         register_command(cmd_ctx, NULL, "debug_level", handle_debug_level_command,
 124                 COMMAND_ANY, "adjust debug level <0-3>");
 125
 126         return ERROR_OK;
 127 }
 128
 129 int log_init(struct command_context_s *cmd_ctx)
 130 {
 131         /* set defaults for daemon configuration, if not set by cmdline or cfgfile */
 132         if (debug_level == -1)
 133                 debug_level = LOG_INFO;
 134
 135         if (log_output == NULL)
 136         {
 137                 log_output = stderr;
 138         }
 139
 140         return ERROR_OK;
 141 }
 142
 143 int set_log_output(struct command_context_s *cmd_ctx, FILE *output)
 144 {
 145         log_output=output;
 146         return ERROR_OK;
 147 }
 148
 149 /* return allocated string w/printf() result */
 150 char *allocPrintf(const char *fmt, va_list ap)
 151 {
 152         char *string=NULL;
 153         int size=0; // start by 0 to exercise all the code paths. Need minimum 2 bytes to fit 1 char and 0 terminator.
 154         int first=1;
 155         for (;;)
 156         {
 157                 if ((string==NULL)||(!first))
 158                 {
 159                         size=size*2+2;
 160                         char *t=string;
 161                         string=realloc(string, size);
 162                         if (string==NULL)
 163                         {
 164                                 if (t!=NULL)
 165                                         free(t);
 166                                 return NULL;
 167                         }
 168                 }
 169
 170             int ret;
 171             ret = vsnprintf(string, size, fmt, ap);
 172             // NB! The result of the vsnprintf() might be an *EMPTY* string!
 173             if ((ret>=0)&&((ret+1)<size))
 174             {
 175                 return string;
 176             }
 177             // there was just enough or not enough space, allocate more.
 178             first=0;
 179         }
 180 }