有用的代码小片段3-linux终端进度条

int progressBar(unsigned int current, unsigned int total, double speed)
{
    double prcnt;
    int num_of_dots;
    char buffer[80] = {0};
    int width;
    /* get term width */
    FILE *fp;
    prcnt=1.0*current/total;
    fp = popen("stty size | cut -d" " -f2","r");
    fgets(buffer, sizeof(buffer),fp);
    pclose(fp);
    width = atoi(buffer);
 
    if ( width < 32)
    {
        printf("e[1A%0.2f%s  %3d%% completed.n",speed, "Mb/s",(int)(prcnt*100));
    }
    else
    {
        num_of_dots = width - 20;
 
        char *pline_to_print = (char *)malloc( sizeof(char)*width );
        int dots = (int)(num_of_dots*prcnt);
 
        memset(pline_to_print,0,width);
        memset(pline_to_print,'>',dots);
        memset(pline_to_print+dots, ' ', num_of_dots - dots);
        printf("e[1A %0.2fMb/s [%s] %3d%% n",speed,pline_to_print,(int)(prcnt*100));
        free(pline_to_print);
    }
    return 0;
}

main()
{
	int i;
	for(i=0;i<100;i++)
	{
		progressBar(i,99,8.55);
		usleep(800);
	}
}