lib/log.c

   1 /*****************************************************************************
   2  * log.c: libvlc new API log functions
   3  *****************************************************************************
   4  * Copyright (C) 2005 VLC authors and VideoLAN
   5  *
   6  * $Id$
   7  *
   8  * Authors: Damien Fouilleul <damienf@videolan.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU Lesser General Public License as published by
  12  * the Free Software Foundation; either version 2.1 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18  * GNU Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with this program; if not, write to the Free Software Foundation,
  22  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 #ifdef HAVE_CONFIG_H
  26 # include "config.h"
  27 #endif
  28
  29 #include <assert.h>
  30 #include <vlc/vlc.h>
  31 #include "libvlc_internal.h"
  32 #include <vlc_common.h>
  33 #include <vlc_interface.h>
  34
  35 /*** Logging core dispatcher ***/
  36
  37 void libvlc_log_get_context(const libvlc_log_t *ctx,
  38                             const char **restrict module,
  39                             const char **restrict file,
  40                             unsigned *restrict line)
  41 {
  42     if (module != NULL)
  43         *module = ctx->psz_module;
  44     if (file != NULL)
  45         *file = ctx->file;
  46     if (line != NULL)
  47         *line = ctx->line;
  48 }
  49
  50 void libvlc_log_get_object(const libvlc_log_t *ctx,
  51                            const char **restrict name,
  52                            const char **restrict header,
  53                            uintptr_t *restrict id)
  54 {
  55     if (name != NULL)
  56         *name = (ctx->psz_object_type != NULL)
  57                 ? ctx->psz_object_type : "generic";
  58     if (header != NULL)
  59         *header = ctx->psz_header;
  60     if (id != NULL)
  61         *id = ctx->i_object_id;
  62 }
  63
  64 static void libvlc_logf (void *data, int level, const vlc_log_t *item,
  65                          const char *fmt, va_list ap)
  66 {
  67     libvlc_instance_t *inst = data;
  68
  69     switch (level)
  70     {
  71         case VLC_MSG_INFO: level = LIBVLC_NOTICE;  break;
  72         case VLC_MSG_ERR:  level = LIBVLC_ERROR;   break;
  73         case VLC_MSG_WARN: level = LIBVLC_WARNING; break;
  74         case VLC_MSG_DBG:  level = LIBVLC_DEBUG;   break;
  75     }
  76
  77     inst->log.cb (inst->log.data, level, item, fmt, ap);
  78 }
  79
  80 static const struct vlc_logger_operations libvlc_log_ops = {
  81     libvlc_logf, NULL
  82 };
  83
  84 void libvlc_log_unset (libvlc_instance_t *inst)
  85 {
  86     vlc_LogSet (inst->p_libvlc_int, NULL, NULL);
  87 }
  88
  89 void libvlc_log_set (libvlc_instance_t *inst, libvlc_log_cb cb, void *data)
  90 {
  91     libvlc_log_unset (inst); /* <- Barrier before modifying the callback */
  92     inst->log.cb = cb;
  93     inst->log.data = data;
  94     vlc_LogSet(inst->p_libvlc_int, &libvlc_log_ops, inst);
  95 }
  96
  97 /*** Helpers for logging to files ***/
  98 static void libvlc_log_file (void *data, int level, const libvlc_log_t *log,
  99                              const char *fmt, va_list ap)
 100 {
 101     FILE *stream = data;
 102
 103     flockfile (stream);
 104     vfprintf (stream, fmt, ap);
 105     fputc ('\n', stream);
 106     funlockfile (stream);
 107     (void) level; (void) log;
 108 }
 109
 110 void libvlc_log_set_file (libvlc_instance_t *inst, FILE *stream)
 111 {
 112     libvlc_log_set (inst, libvlc_log_file, stream);
 113 }