icecast-common/log/log.c

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

#ifndef _WIN32
#include <pthread.h>
#else
#include <windows.h>
#endif

#include "log.h"

#define LOG_MAXLOGS 25
#define LOG_MAXLINELEN 1024

#ifdef _WIN32
#define mutex_t CRITICAL_SECTION
#define snprintf _snprintf
#define vsnprintf _vsnprintf
#else
#define mutex_t pthread_mutex_t
#endif

static mutex_t _logger_mutex;
static int _initialized = 0;

typedef struct log_tag
{
    int in_use;

    int level;

    char *filename;
    FILE *logfile;
    
    char *buffer;
} log_t;

log_t loglist[LOG_MAXLOGS];

int _get_log_id();
void _release_log_id(int log_id);
static void _lock_logger();
static void _unlock_logger();

void log_initialize()
{
    int i;

    if (_initialized) return;

    for (i = 0; i < LOG_MAXLOGS; i++) {
        loglist[i].in_use = 0;
        loglist[i].level = 2;
        loglist[i].filename = NULL;
        loglist[i].logfile = NULL;
        loglist[i].buffer = NULL;
    }

    /* initialize mutexes */
#ifndef _WIN32
    pthread_mutex_init(&_logger_mutex, NULL);
#else
    InitializeCriticalSection(&_logger_mutex);
#endif

    _initialized = 1;
}

int log_open_file(FILE *file)
{
    int log_id;

    if(file == NULL) return LOG_EINSANE;

    log_id = _get_log_id();
    if (log_id < 0) return LOG_ENOMORELOGS;

    loglist[log_id].logfile = file;
    if (loglist[log_id].logfile != NULL) {
        loglist[log_id].filename = NULL;
    } else {
        _release_log_id(log_id);
        return LOG_ECANTOPEN;
    }

    return log_id;
}


int log_open(const char *filename)
{
    int ret;
    FILE *file;

    if (filename == NULL) return LOG_EINSANE;
    if (strcmp(filename, "") == 0) return LOG_EINSANE;
    
    file = fopen(filename, "a");

    ret = log_open_file(file);

    if(ret >= 0)
        setvbuf(file, NULL, IO_BUFFER_TYPE, 0);

    return ret;
}

int log_open_with_buffer(const char *filename, int size)
{
    /* not implemented */
    return LOG_ENOTIMPL;
}

void log_set_level(int log_id, int level)
{
    if (log_id < 0 || log_id >= LOG_MAXLOGS) return;
    if (loglist[log_id].in_use == 0) return;

    loglist[log_id].level = level;
}

void log_flush(int log_id)
{
    if (log_id < 0 || log_id >= LOG_MAXLOGS) return;
    if (loglist[log_id].in_use == 0) return;

    fflush(loglist[log_id].logfile);
}

void log_reopen(int log_id)
{
    /* not implemented yet */
}

void log_close(int log_id)
{
    if (log_id < 0 || log_id >= LOG_MAXLOGS) return;
    if (loglist[log_id].in_use == 0) return;

    loglist[log_id].in_use = 0;
    loglist[log_id].level = 2;
    if (loglist[log_id].filename) free(loglist[log_id].filename);
    if (loglist[log_id].buffer) free(loglist[log_id].buffer);
    fclose(loglist[log_id].logfile);
    loglist[log_id].logfile = NULL;
}

void log_shutdown()
{
    /* destroy mutexes */
#ifndef _WIN32
    pthread_mutex_destroy(&_logger_mutex);
#else
    DeleteCriticalSection(&_logger_mutex);
#endif 

    _initialized = 0;
}

void log_write(int log_id, int priority, const char *cat, const char *func, 
        const char *fmt, ...)
{
        static char prior[4][5] = { "EROR\0", "WARN\0", "INFO\0", "DBUG\0" };
    char tyme[128];
    char pre[256];
    char line[LOG_MAXLINELEN];
    time_t now;
    va_list ap;

    if (log_id < 0) return;
    if (log_id > LOG_MAXLOGS) return; /* Bad log number */
    if (loglist[log_id].level < priority) return;
    if (priority > 4) return; /* Bad priority */


    va_start(ap, fmt);
    vsnprintf(line, LOG_MAXLINELEN, fmt, ap);

    now = time(NULL);

    /* localtime() isn't threadsafe, localtime_r isn't portable enough... */
    _lock_logger();
    strftime(tyme, 128, "[%Y-%m-%d  %H:%M:%S]", localtime(&now)); 
    _unlock_logger();

    snprintf(pre, 256, "%s %s%s", prior[priority-1], cat, func);

    fprintf(loglist[log_id].logfile, "%s %s %s\n", tyme, pre, line); 

    va_end(ap);
}

void log_write_direct(int log_id, const char *fmt, ...)
{
    char line[LOG_MAXLINELEN];
    va_list ap;

    if (log_id < 0) return;
    
    va_start(ap, fmt);
    vsnprintf(line, LOG_MAXLINELEN, fmt, ap);
    fprintf(loglist[log_id].logfile, "%s\n", line);
    va_end(ap);

    fflush(loglist[log_id].logfile);
}

int _get_log_id()
{
    int i;
    int id = -1;

    /* lock mutex */
    _lock_logger();

    for (i = 0; i < LOG_MAXLOGS; i++)
        if (loglist[i].in_use == 0) {
            loglist[i].in_use = 1;
            id = i;
            break;
        }

    /* unlock mutex */
    _unlock_logger();

    return id;
}

void _release_log_id(int log_id)
{
    /* lock mutex */
    _lock_logger();

    loglist[log_id].in_use = 0;

    /* unlock mutex */
    _unlock_logger();
}

static void _lock_logger()
{
#ifndef _WIN32
    pthread_mutex_lock(&_logger_mutex);
#else
    EnterCriticalSection(&_logger_mutex);
#endif
}

static void _unlock_logger()
{
#ifndef _WIN32
    pthread_mutex_unlock(&_logger_mutex);
#else
    LeaveCriticalSection(&_logger_mutex);
#endif    
}