/*

 * This file is part of libbluray

 * Copyright (C) 2009-2010  Obliter0n

 * Copyright (C) 2009-2010  John Stebbins

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library. If not, see

 * <http://www.gnu.org/licenses/>.

 */

#if HAVE_CONFIG_H

#include "config.h"

#endif

#include "logging.h"

#include "file/file.h"

#include <stdlib.h>

#include <stdio.h>

#include <stdarg.h>

#include <string.h>

uint32_t            debug_mask = (uint32_t)-1; /* set all bits to make sure bd_debug() is called for initialization */

static BD_LOG_FUNC  log_func   = NULL;

void bd_set_debug_handler(BD_LOG_FUNC f)

{

    log_func = f;

}

void bd_set_debug_mask(uint32_t mask)

{

    debug_mask = mask;

}

uint32_t bd_get_debug_mask(void)

{

    return debug_mask;

}

void bd_debug(const char *file, int line, uint32_t mask, const char *format, ...)

{

    static int   debug_init = 0, debug_file = 0;

    static FILE *logfile    = NULL;

    // Only call getenv() once.

    if (!debug_init) {

        debug_init = 1;

        logfile = stderr;

        char *env = NULL;

        if (debug_mask == (uint32_t)-1) {

            /* might be set by application with bd_set_debug_mask() */

            debug_mask = DBG_CRIT;

        }

        if ((env = getenv("BD_DEBUG_MASK")))

            debug_mask = strtol(env, NULL, 0);

        // Send DEBUG to file?

        if ((env = getenv("BD_DEBUG_FILE"))) {

            FILE *fp = fopen(env, "wb");

            if (fp) {

                logfile = fp;

                setvbuf(logfile, NULL, _IONBF, 0);

                debug_file = 1;

            } else {

                fprintf(logfile, "%s:%d: Error opening log file %s\n", __FILE__, __LINE__, env);

            }

        }

    }

    if (mask & debug_mask) {

        const char *f = strrchr(file, DIR_SEP_CHAR);

        char buffer[4096];

        va_list args;

        int len, len2;

        BD_LOG_FUNC lf;

        len = sprintf(buffer, "%s:%d: ", f ? f + 1 : file, line);

        if (len < 0) {

            return;

        }

        va_start(args, format);

        len2 = vsnprintf(buffer + len, sizeof(buffer) - len - 1, format, args);

        va_end(args);

        if (len2 < 0) {

            return;

        }

        lf = log_func;

        if (lf) {

            buffer[sizeof(buffer)-1] = 0;

            lf(buffer);

        }

        if (!lf || debug_file) {

            len += len2;

            if ((size_t)len >= sizeof(buffer)) {

                len = sizeof(buffer);

            }

            fwrite(buffer, len, 1, logfile);

        }

    }

}