src/logging.c

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2017 Olaf Wintermann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "ucx/logging.h"

#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <time.h>

UcxLogger *ucx_logger_new(void *stream, unsigned int level, unsigned int mask) {
    UcxLogger *logger = (UcxLogger*) malloc(sizeof(UcxLogger));
    if (logger != NULL) {
        logger->stream = stream;
        logger->writer = (write_func)fwrite;
        logger->dateformat = (char*) "%F %T %z ";
        logger->level = level;
        logger->mask = mask;
        logger->levels = ucx_map_new(8);
        
        unsigned int l;
        l = UCX_LOGGER_ERROR;
        ucx_map_int_put(logger->levels, l, (void*) "[ERROR]");
        l = UCX_LOGGER_WARN;
        ucx_map_int_put(logger->levels, l, (void*) "[WARNING]");
        l = UCX_LOGGER_INFO;
        ucx_map_int_put(logger->levels, l, (void*) "[INFO]");
        l = UCX_LOGGER_TRACE;
        ucx_map_int_put(logger->levels, l, (void*) "[TRACE]");
    }

    return logger;
}

void ucx_logger_free(UcxLogger *logger) {
    ucx_map_free(logger->levels);
    free(logger);
}

// estimated max. message length (documented)
#define UCX_LOGGER_MSGMAX 4096

void ucx_logger_logf(UcxLogger *logger, unsigned int level, const char* file,
        const unsigned int line, const char *format, ...) {
    if (level <= logger->level) {
        char msg[UCX_LOGGER_MSGMAX];
        char *text;
        size_t k = 0;
        size_t n;
        
        if ((logger->mask & UCX_LOGGER_LEVEL) > 0) {
            text = (char*) ucx_map_int_get(logger->levels, level);
            n = strlen(text);
            n = n > 256 ? 256 : n;
            memcpy(msg+k, text, n);
            k += n;
            msg[k++] = ' ';
        }
        if ((logger->mask & UCX_LOGGER_TIMESTAMP) > 0) {
            time_t now = time(NULL);
            k += strftime(msg+k, 128, logger->dateformat, localtime(&now));
        }
        if ((logger->mask & UCX_LOGGER_SOURCE) > 0) {
            n = strlen(file);
            memcpy(msg+k, file, n);
            k += n;
            k += sprintf(msg+k, ":%u ", line);
        }
        
        msg[k++] = '-'; msg[k++] = ' ';
        
        va_list args;
        va_start (args, format);
        k += vsnprintf(msg+k, UCX_LOGGER_MSGMAX-k-1, format, args);
        va_end (args);        
        
        msg[k++] = '\n';
        
        logger->writer(msg, 1, k, logger->stream);
    }
}