timeit command

timeit.c

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

int main(int argc, char *argv[]){

    clock_t start, end;
    FILETIME creationTime, exitTime;
    FILETIME kernelTime, userTime;
    SYSTEMTIME ek, eu;
    PROCESS_INFORMATION pi;
    STARTUPINFO si;
    int i;
    int flag = 1;
    char arg[255] = "";

    if(argc < 2){
        printf("Usage: timeit \"program name\"\n");
        return 1;
    }
    else{
        for(i = 1; i < argc; i++){
            strcat(arg, argv[i]);
            strcat(arg, " ");
        }
    }

    ZeroMemory(&si,sizeof(si));
    si.cb=sizeof(si);

    printf("--------------------------------------------------\n\n");
    start = clock();

    //実行ファイルのみできる。内部コマンド、ファイル名単体は駄目ぽい。
    flag = CreateProcess(NULL,(LPSTR)arg,NULL,NULL,FALSE,
                            NORMAL_PRIORITY_CLASS,
                            NULL,NULL,&si,&pi);

    WaitForSingleObject(pi.hProcess, INFINITE);
    end = clock();
    GetProcessTimes(pi.hProcess,&creationTime,&exitTime,
                    &kernelTime,&userTime);

    printf("\n--------------------------------------------------\n");

    if(flag == 0){
        printf("Usage: timeit \"program name\"\n");
        return 1;
    }

    long long int* uTime = (long long int*)&userTime;
    long long int* kTime = (long long int*)&kernelTime;
    double uSec = *uTime / 10000000.0;
    double kSec = *kTime / 10000000.0;
    printf("real:    %f sec.\n", ((float)(end-start))/1000.0);
    printf("user:    %f sec.\n",uSec);
    printf("kernel:  %f sec.\n",kSec);
    printf("flag:    %d\n", flag);
    return 0;
}