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/********************************************************************************* * Copyright: (C) 2022 LingYun IoT System Studio * All rights reserved. * * Filename: logger.c * Description: This file * * Version: 1.0.0(15/04/22) * Author: LingYun <[email protected]> * ChangeLog: 1, Release initial version on "15/04/22 10:38:49" * ********************************************************************************/ #include <stdio.h> #include <errno.h> #include <time.h> #include <stdarg.h> #include <string.h> #include "logger.h" /* * Program name variable is provided by the libc */ extern const char* __progname; #define PROGRAM_NAME __progname /* * Logger internal sctructure */ typedef struct logger_s { FILE *fp; int loglevel; int use_stdout; } logger_t; static struct logger_s g_logger; static const char* LOG_LEVELS[] = { LOG_STRING_ERROR, LOG_STRING_WARN, LOG_STRING_INFO, LOG_STRING_DEBUG }; /* * initial logger system */ int logger_init(char *filename, int loglevel) { logger_term(); g_logger.loglevel = loglevel>LOG_LEVEL_MAX ? LOG_LEVEL_MAX : loglevel; /* $filename is NULL or match "stdout" will use standard output */ if( !filename || !strcasecmp(filename, "stdout")) { g_logger.use_stdout = 1; g_logger.fp = stderr; } else { g_logger.use_stdout = 0; g_logger.fp = fopen(filename, "a"); if( !g_logger.fp ) { fprintf(stderr, "Failed to open file '%s': %s", filename, strerror(errno)); return -1; } } return 0; } /* * terminate logger system */ void logger_term(void) { if( !g_logger.fp ) { return ; } if( !g_logger.use_stdout ) { fclose(g_logger.fp); } g_logger.use_stdout = 0; g_logger.fp = NULL; return ; } /* * Logging functions */ void log_generic(const int level, const char* format, va_list args) { char message[256]; struct tm* current_tm; time_t time_now; vsprintf(message, format, args); time(&time_now); current_tm = localtime(&time_now); int res = fprintf(g_logger.fp, "%s : %02i:%02i:%02i [%s] %s\n" , PROGRAM_NAME , current_tm->tm_hour , current_tm->tm_min , current_tm->tm_sec , LOG_LEVELS[level] , message ); fflush(g_logger.fp); } void log_error(char *format, ...) { va_list args; va_start(args, format); log_generic(LOG_LEVEL_ERROR, format, args); va_end(args); } void log_warn(char *format, ...) { if (g_logger.loglevel < LOG_LEVEL_WARN) { return; } va_list args; va_start(args, format); log_generic(LOG_LEVEL_WARN, format, args); va_end(args); } void log_info(char *format, ...) { if (g_logger.loglevel < LOG_LEVEL_INFO) { return; } va_list args; va_start(args, format); log_generic(LOG_LEVEL_INFO, format, args); va_end(args); } void log_debug(char *format, ...) { if (g_logger.loglevel < LOG_LEVEL_DEBUG) { return; } va_list args; va_start(args, format); log_generic(LOG_LEVEL_DEBUG, format, args); va_end(args); }