Bridge_FileLogger.c

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#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
 
#include "Bridge_LogHelper.h"
#include "Bridge_FileLogger.h"
 
static void _WriteLine(const char* loglevel, const char* message, FILE* fp)
{
    char buffer[512] = { 0 };
 
    if (fp != NULL)
    {
        if (LogHelper_FormatLogLine(loglevel, message, buffer, sizeof(buffer)))
        {
            size_t numElementsToWrite = strlen(buffer);
            size_t numElementsWritten = fwrite(buffer, sizeof(char), numElementsToWrite, fp);
            if (numElementsWritten != numElementsToWrite)
            {
                int errorcode = errno;
                char *errmessage = strerror(errorcode);
                printf("  Error (%d) writing log file: %s\n", errorcode, errmessage);
                printf("%s", buffer);
            }
        }
    }
}
 
static void _File_LogTrace(const char* message, void* data)
{
    FILE* fp = NULL;
    if (data != NULL)
    {
        fp = (FILE*)data;
    }
    _WriteLine("TRACE", message, fp);
}
 
 
static void _File_LogInfo(const char* message, void* data)
{
    FILE* fp = NULL;
    if (data != NULL)
    {
        fp = (FILE*)data;
    }
    _WriteLine("INFO ", message, fp);
}
 
 
static void _File_LogError(const char* message, void* data)
{
    FILE* fp = NULL;
    if (data != NULL)
    {
        fp = (FILE*)data;
    }
    _WriteLine("ERROR", message, fp);
}
 
 
// CreateFileLogger()
ILogger* CreateFileLogger(const char* filename)
{
    ILogger* logger = calloc(1, sizeof(ILogger));
    if (logger != NULL && filename != NULL)
    {
        FILE *fp = NULL;
        logger->LogTrace = _File_LogTrace;
        logger->LogInfo = _File_LogInfo;
        logger->LogError = _File_LogError;
        logger->data = NULL;
        fp = fopen(filename, "w");
        if (fp != NULL)
        {
            logger->data = fp;
        }
        else
        {
            int errorcode = errno;
            char *errmessage = strerror(errorcode);
            printf("  Error (%d) opening log file '%s': %s\n", errorcode, filename, errmessage);
            free(logger);
            logger = NULL;
        }
    }
 
    return logger;
}
 
// DestroyFileLogger()
void DestroyFileLogger(ILogger* logger)
{
    if (logger != NULL)
    {
        if (logger->data != NULL)
        {
            FILE* fp = (FILE*)logger->data;
            fclose(fp);
        }
        free(logger);
    }
}