getopt_long.cpp

#include <getopt.h>                                                                                                                                               
#include <stdio.h>                                                                                                                                                
#include <stdlib.h>                                                                                                                                               
#include <unistd.h>                                                                                                                                               
                                                                                                                                                                  
extern int optind, opterr, optopt;                                                                                                                                
extern char * optarg;                                                                                                                                             
                                                                                                                                                                  
static struct option long_options[]                                                                                                                               
{                                                                                                                                                                 
    {"log", no_argument, NULL, 'l'},                                                                                                                              
    {"file", required_argument, NULL, 'f'},                                                                                                                       
    {"insert", required_argument, NULL, 'i'},                                                                                                                     
    {"update", required_argument, NULL, 'u'},                                                                                                                     
    {"delete", required_argument, NULL, 'd'},                                                                                                                     
    {"get", required_argument, NULL, 'g'}                                                                                                                         
};                                                                                                                                                                     
                                                                                                                                                                  
int insert_num = 0;                                                                                                                                               
int update_num = 0;                                                                                                                                               
int delete_num = 0;                                                                                                                                               
int get_num = 0;                                                                                                                                                  
                                                                                                                                                                  
int thread_num = 1;                                                                                                                                               
                                                                                                                                                                  
bool has_log_option = false;                                                                                                                                      
bool has_file_option = false;                                                                                                                                     
char file_name[1024];

int main(int argc, char * argv[])
{
    int index = 0;
    int c = 0;

    while (EOF != (c = getopt_long(argc, argv, "iudglft:", long_options, &index)))
    {
        switch (c)
        {
            case 'i':
                insert_num = atoi(optarg);
                break;
            case 'u':
                update_num = atoi(optarg);
                break;
            case 'd':
                delete_num = atoi(optarg);
                break;
            case 'g':
                get_num = atoi(optarg);
                break;
            case 'l':
                has_log_option = true;
                break;
            case 'f':
                has_file_option = true;
                sprintf(file_name, "%s", optarg);
                break;
            case 't':
                thread_num = atoi(optarg);
                break;
            default:
                printf("Unknown option: %c\n", optopt);
        }
    }
}