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568caa0501
The goal of util_log is to provide a facility for a multi-level message logging on stderr. This allows to selectively enable/disable log messages via a log level which can be adjusted at runtime. Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com> Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com> Reviewed-by: Philipp Rudo <prudo@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
71 lines
1.5 KiB
C
71 lines
1.5 KiB
C
/*
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* Multi-level message logging
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*
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* Copyright IBM Corp. 2021
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*
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* s390-tools is free software; you can redistribute it and/or modify
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* it under the terms of the MIT license. See LICENSE for details.
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*/
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#include <stdio.h>
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#include <stdarg.h>
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#include "lib/util_log.h"
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static int current_log_level = UTIL_LOG_INFO;
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static const char *log_level_to_str(int log_level)
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{
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switch (log_level) {
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case UTIL_LOG_ERROR:
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return "ERROR";
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case UTIL_LOG_WARN:
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return "WARN";
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case UTIL_LOG_INFO:
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return "INFO";
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case UTIL_LOG_DEBUG:
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return "DEBUG";
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case UTIL_LOG_TRACE:
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return "TRACE";
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default:
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return "UNKNW";
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}
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}
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static void log_helper(FILE *fp, int log_level, const char *fmt, va_list args)
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{
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if (current_log_level < log_level)
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return;
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fprintf(fp, "%5s: ", log_level_to_str(log_level));
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vfprintf(fp, fmt, args);
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}
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/**
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* Changes the current log level
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*
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* @param[in] log_level A new log level to be set as the current one
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*/
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void util_log_set_level(int log_level)
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{
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current_log_level = log_level;
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}
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/**
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* Outputs the given message on stderr
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*
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* The given message is printed only if the current log level is >= than the given one.
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*
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* @param[in] log_level Log level starting from which the given message shall be printed
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* @param[in] fmt Format string for generation of the log message
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* @param[in] ... Parameters for format string
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*/
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void util_log_print(int log_level, const char *fmt, ...)
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{
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va_list args;
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va_start(args, fmt);
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log_helper(stderr, log_level, fmt, args);
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va_end(args);
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}
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