extern "C"

Цитата(Iron Bug @ 18.3.2014, 8:26)

/** logger.h
 * This file describes the log-functions and variables
**/

#ifndef LOGGER_H_05550
#define LOGGER_H_05550

#include <syslog.h>
#include <sys/types.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdint.h>

#ifdef __cplusplus
  extern "C" {
#endif

#define MAX_APP_NAME_LEN 1024

typedef uint32_t LoggerVerbosityLevel;        ///< in debug each loop level should increment it

typedef enum { LogEmerg = 0, LogAlert, LogCrit, LogErr, LogWarning, LogNotice, LogInfo, LogDebug } LoggerLevel;

#define LOG_OUTPUT_NONE 0
#define LOG_OUTPUT_SYSLOG 1
#define LOG_OUTPUT_TTY 2
/// 3, 7, 15, 31 and etc is not defined, because in binary mode they are consist from units
#define LOG_OUTPUT_FILE 4

#define LOGGER_OUTPUT_MASK 0x7

/// Structure of the log message
typedef struct
{
    LoggerLevel level;        ///< log level of the message
    char* header;            ///< header of the message
    char* text;                ///< text of the message
    FILE* file;                ///< possibility of writing to file
} LMessage;

/**
 * @brief Initialization the logger
 * @param app_name - name of the application
 * @param log_level - level of the log message
 * @param verbosity - type of the log verbosity
 * @param dev - output device (tty, or file, or syslog)
 * @param file_name - name of the file (if the file is exist)
**/
void lmsg_init(const char* app_name, LoggerLevel log_level, LoggerVerbosityLevel
               verbosity, uint32_t dev, char* file_name);

/**
 * @brief Prints the message to an output device
 * @param log_level - level of the log message
 * @param verbosity - type of the log verbosity
 * @param message - outputing message
**/
void lmsg_log(LoggerLevel log_level, LoggerVerbosityLevel verbosity,
              const char* message, ...);

/** @brief Closes the logger output and free memory **/
void lmsg_close();

#ifdef __cplusplus
 };
#endif

#endif //LOGGER_H_05550

#include "logger.h"

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

/// @name Declaration
/**@{*/

/// @name Global variables
/**@{*/

static struct timespec last_time = {};    ///< time of the log writing
static char* application_name = NULL;    ///< name of the application
static LoggerLevel init_level;            ///< level of the messages
static LoggerVerbosityLevel init_verb;    ///< verbosity of the messages
static char* init_fname = NULL;            ///< file name of the output file
static FILE* log_file = NULL;            ///< log-file

static uint32_t output_flags = 0;                ///< flags which determine the output
typedef void(*out_method)(LMessage* message);    ///< callback for the output method
static out_method* output_methods = NULL;        ///< pointer to the current output method

static pthread_mutex_t log_lock;        /// mutex which locks for writing

/**@}*/

/// @name Global functions
/**@{*/

static void to_syslog(LMessage* message);    ///< print the message to syslog
static void to_tty(LMessage* message);        ///< print the message to screen
static void to_file(LMessage* message);        ///< print the message to file

static char* getHeader(LoggerLevel log_level);                ///< get the header of the each message

static const int level2syslog(LoggerLevel log_level);        ///< translation the level to syslog type
static const char* level2str(LoggerLevel log_level);        ///< translation the level to string

/**@}*/
/**@}*/

/// @name Realization
/**@{*/

/// Initialization the logger
void lmsg_init(const char* app_name, LoggerLevel log_level, LoggerVerbosityLevel
               verbosity, uint32_t dev, char* file_name)
{
    init_level = log_level;
    init_verb = verbosity;
    output_flags = (dev & LOGGER_OUTPUT_MASK);
    init_fname = file_name;

    pthread_mutex_init(&log_lock, NULL);

    const char default_app_name[] = "unknown application";

    int sl = strlen(app_name);
    if(sl > MAX_APP_NAME_LEN - 1) sl = MAX_APP_NAME_LEN - 1;
    if(!sl)
    {
        sl = strlen(default_app_name);
        app_name = default_app_name;
    }

    application_name = malloc(sl);
    strcpy(application_name, app_name);

    if(init_fname) log_file = fopen(init_fname, "a");
    uint32_t tmp_m = output_flags;
    int c = 0;
    while(tmp_m)
    {
        if(tmp_m & 0x1)
            ++c;
        tmp_m = (tmp_m >> 1);
    }

    output_methods = (out_method*)malloc(c + 1);

    output_methods[c] = NULL;
    c = 0;
    if(output_flags & LOG_OUTPUT_SYSLOG)
    {
        openlog(application_name, 0, LOG_DAEMON);
        output_methods[c] = &to_syslog;
        ++c;
    }
    if(output_flags & LOG_OUTPUT_TTY)
    {
        output_methods[c] = &to_tty;
        ++c;
    }
    if(output_flags & LOG_OUTPUT_FILE)
    {
        output_methods[c] = &to_file;
        ++c;
    }
}

/// Print the message to an output device
void lmsg_log(LoggerLevel log_level, LoggerVerbosityLevel verbosity,
              const char* message, ...)
{
    if(init_level < log_level || init_verb < verbosity) return;

    static char buffer[4 * MAX_APP_NAME_LEN] = {};
    static LMessage msg_struct;

    pthread_mutex_lock(&log_lock);

        va_list args;
        va_start(args, message);
        vsprintf(buffer, message, args);
        va_end(args);

        msg_struct.level = log_level;
        msg_struct.header = getHeader(log_level);
        msg_struct.text = buffer;
        msg_struct.file = log_file;

        int i = -111111;
        for(i=0; output_methods[i]; ++i)
            output_methods[i](&msg_struct);

    pthread_mutex_unlock(&log_lock);
}

/// Print the message to syslog
static void to_syslog(LMessage* message)
{ syslog(level2syslog(message -> level), "%s", message -> text); }

/// Print the message to screen
static void to_tty(LMessage* message)
{
    printf("%s %s\n", message -> header, message -> text);
    fflush(stdout);
}

/// Print the message to file
static void to_file(LMessage* message)
{
    FILE* thf = message -> file;
    if(!thf) return;

    fputs(message -> header, thf);
    fputs(message -> text, thf);
    fputs("\n", thf);
    fflush(thf);
}

/// Get the header of the each message
static char* getHeader(LoggerLevel log_level)
{
    static char header_str[MAX_APP_NAME_LEN];
    static struct timespec rawtime = {};
    static struct tm* timeinfo = NULL;

    memset(header_str, 0, MAX_APP_NAME_LEN);
    if(clock_gettime(CLOCK_REALTIME, &rawtime) != -1)
    {
        timeinfo = localtime(&rawtime.tv_sec);
        static char tmp_t[21] = {}, tmp_t1[11] = {};
        if((!timeinfo -> tm_hour && !timeinfo -> tm_min && !timeinfo -> tm_sec) ||
           (!last_time.tv_sec && !last_time.tv_nsec))
        {
            strftime(tmp_t, sizeof(tmp_t), "%d.%m.%Y %A", timeinfo);
            strftime(tmp_t1, sizeof(tmp_t1), "%T", timeinfo);
            sprintf(header_str, "%s %s\n%s%s: ", tmp_t, application_name, level2str(log_level), tmp_t1);
        }
        else
        {
            strftime(tmp_t, sizeof(tmp_t), "%T", timeinfo);
            sprintf(header_str, "%s%s: ", level2str(log_level), tmp_t);
        }
        last_time = rawtime;
    }

    return header_str;
}

/// Translation the level to syslog type
static const int level2syslog(LoggerLevel log_level)
{
    static const int translation[] = { LOG_EMERG, LOG_ALERT, LOG_CRIT, LOG_ERR, LOG_WARNING, LOG_NOTICE,
                                        LOG_INFO, LOG_DEBUG };
    return translation[log_level];
}

/// Translation the level to string
static const char* level2str(LoggerLevel log_level)
{
    static const char* translation[] = { "EMERG  ", "ALERT  ", "CRIT  ", "ERROR  ", "WARNING  ",
                                            "NOTICE  ", "INFO  ",  "DEBUG  " };
    return translation[log_level];
}

/// Close the logger output and free memory
void lmsg_close()
{
    if(log_file)
        fclose(log_file);

    if(output_flags & LOG_OUTPUT_SYSLOG)
        closelog();

    if(output_methods)
        free(output_methods);

    free(application_name);
}

/**@}*/

#include <stdio.h>

#include "bit_operations.h"
#include "logger.h"

int main(int argc, char* argv[])
{
    char* fl_name = (char*)("/ram/logger_log.txt");
    lmsg_init("kc-logger", LogDebug, 11, LOG_OUTPUT_FILE, fl_name);
    printf("Welcome to the application kc-logger\n");

    int a = 1;
    printf("Before bit setting a = %i\n", a);
    int a_new = setBit4(a, 3);
    printf("After bit setting a = %i\n", a_new);

    lmsg_log(LogDebug, 9, "tttttt");
    lmsg_log(LogDebug, 9, "1111");
    lmsg_close();

    return 0;
}

/** bit_operations.h
 * This file describes the functions set/clear/check bit in byte
**/

#ifndef BIT_OPERATIONS_H_05550
#define BIT_OPERATIONS_H_05550

#include <stdbool.h>

/**
 * @brief Sets a bit into 1 of the arg argument according to specified bit number num_bit
 * @param arg - source argument
 * @param num_bit - bit number
 * @return New value of the argument arg
**/
unsigned char setBit1(unsigned char arg, unsigned int num_bit);
unsigned int setBit4(unsigned int arg, unsigned int num_bit);

/**
 * @brief Sets a bit into 0 of the arg argument according to specified bit number num_bit
 * @param arg - source argument
 * @param num_bit - bit number
 * @return New value of the argument arg
**/
unsigned char clearBit1(unsigned char arg, unsigned int num_bit);
unsigned int clearBit4(unsigned int arg, unsigned int num_bit);

/**
 * @brief Checks a bit of the arg argument according to specified bit number num_bit
 * @param arg - source argument
 * @param num_bit - bit number
 * @return True if the bit in argument arg is equal 1, false - otherwise
**/
bool checkBit1(unsigned char arg, unsigned int num_bit);
bool checkBit4(unsigned int arg, unsigned int num_bit);

/**
 * @brief Extracts bits from bit number num_bit1 by bit number num_bit2
 * @param arg - source argument
 * @param num_bit1 - first bit number
 * @param num_bit2 - second bit number
 * @return Result of the extracting bits
**/
unsigned char extractBits1(unsigned char arg, unsigned int num_bit1, unsigned int num_bit2);
unsigned int extractBits4(unsigned int arg, unsigned int num_bit1, unsigned int num_bit2);

#endif // BIT_OPERATIONS_H_05550

#include "bit_operations.h"

/// Sets a bit into 1 of the arg argument according to specified bit number num_bit
unsigned char setBit1(unsigned char arg, unsigned int num_bit)
{ arg |= (1 << num_bit); return arg; }
unsigned int setBit4(unsigned int arg, unsigned int num_bit)
{ arg |= (1L << num_bit); return arg; }

/// Sets a bit into 0 of the arg argument according to specified bit number num_bit
unsigned char clearBit1(unsigned char arg, unsigned int num_bit)
{ arg &= ~(1 << num_bit); return arg; }
unsigned int clearBit4(unsigned int arg, unsigned int num_bit)
{ arg &= ~(1L << num_bit); return arg; }

/// Checks a bit of the arg argument according to specified bit number num_bit
bool checkBit1(unsigned char arg, unsigned int num_bit)
{ return (arg & (1 << num_bit)); }
bool checkBit4(unsigned int arg, unsigned int num_bit)
{ return (arg & (1L << num_bit)); }

/// Extracts bits from bit number num_bit1 by bit number num_bit2
unsigned char extractBits1(unsigned char arg, unsigned int num_bit1, unsigned int num_bit2)
{ return (((arg & (((1 << (num_bit2 - num_bit1 + 1)) - 1) << num_bit1)) >> num_bit1)); }
unsigned int extractBits4(unsigned int arg, unsigned int num_bit1, unsigned int num_bit2)
{ return (((arg & (((1L << (num_bit2 - num_bit1 + 1)) - 1) << num_bit1)) >> num_bit1)); }