lib/log.c

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