YMLib - LinuxC - 時刻とメッセージの表示

時刻とメッセージの表示

2013/10/15

任意のメッセージに時刻をつけて表示する関数を作ります。

◆環境

OS	Linux obsax3 3.0.6 #1 SMP Fri Nov 16 11:53:45 JST 2012 armv7l GNU/Linux
gcc	4.4.5

LC111.c

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/* 2013/10/15 (c) ymlib.com */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <time.h>

void outputLog ( const char* format, ... );

int main( int argc, char** argv )
{
    int iRet = 0;

    outputLog( "START main" );

    outputLog( "E N D main ret=%d", iRet );

    return( 0 );
}

void outputLog( const char* format, ... )
{
    char msg[256];
    va_list list;

    memset( msg, 0x00, sizeof( msg ) );

    va_start( list, format );
    vsprintf( msg, format, list );
    va_end( list );

    time_t timer;
    time_t timeRet;
    timeRet = time( &timer );
    struct tm* nowTM;
    nowTM = localtime( &timer );

    printf( "%d/%02d/%02d %02d:%02d:%02d %s\n"
          , ( nowTM->tm_year + 1900 )
          , ( nowTM->tm_mon+1 )
          , nowTM->tm_mday
          , nowTM->tm_hour
          , nowTM->tm_min
          , nowTM->tm_sec
          , msg
          );
}

makefile

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# 2013/10/15 (c) ymlib.com
TARGET = LC111
OBJS = LC111.o
CC = /usr/bin/gcc

$(TARGET): $(OBJS)
$(CC) -o $@ $(OBJS)
.SUFFIXES: .c.o
.c.o:
$(CC) -Wall -c $< -g

clean:
rm -f $(TARGET) $(OBJS)

◆実行結果

# ./LC111
2013/10/15 14:45:13 START main
2013/10/15 14:45:13 E N D main ret=0

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