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  • [linux]getopt_long

    linux下的命令行参数函数的使用

    struct option 成员的解析

    //{选项名,是否需要参数,如果是NULL,则getopt_long返回val(通常设定为short option)
        //如果非NULL,则getopt_long返回0,flag 指向val 
        //{"get",no_argument,&method,METHOD_GET}, ==》 匹配到get选项时,getopt_long返回0,method=METHOD_GET
        //}

    getopt_long 参数的解析

    //912Vfr ?h==> -9 -1 -2 -V -f -r
        //t: p: c:==>-t 100  选项后面要带一个参数
        //如果是字母后面带两个冒号表示选项后面的参数可有可无
    #include <stdio.h>
    #include <stdlib.h>
    #include <unistd.h>
    #include <getopt.h>
    static void usage(void)
    {
        fprintf(stderr,
                "webbench [option]... URL\n"
                "  -f|--force               Don't wait for reply from server.\n"
                "  -r|--reload              Send reload request - Pragma: no-cache.\n"
                "  -t|--time <sec>          Run benchmark for <sec> seconds. Default 30.\n"
                "  -p|--proxy <server:port> Use proxy server for request.\n"
                "  -c|--clients <n>         Run <n> HTTP clients at once. Default one.\n"
                "  -9|--http09              Use HTTP/0.9 style requests.\n"
                "  -1|--http10              Use HTTP/1.0 protocol.\n"
                "  -2|--http11              Use HTTP/1.1 protocol.\n"
                "  --get                    Use GET request method.\n"
                "  --head                   Use HEAD request method.\n"
                "  --options                Use OPTIONS request method.\n"
                "  --trace                  Use TRACE request method.\n"
                "  -?|-h|--help             This information.\n"
                "  -V|--version             Display program version.\n"
               );
    }
    /* values */
    volatile int timerexpired=0;
    int speed=0;
    int failed=0;
    int bytes=0;
    
    /* globals */
    int http10=1; /* 0 - http/0.9, 1 - http/1.0, 2 - http/1.1 */
    /* Allow: GET, HEAD, OPTIONS, TRACE */
    #define METHOD_GET 0
    #define METHOD_HEAD 1
    #define METHOD_OPTIONS 2
    #define METHOD_TRACE 3
    #define PROGRAM_VERSION "1.5"
    int method=METHOD_GET;
    int clients=1;
    int force=0;
    int force_reload=0;
    int proxyport=80;
    char *proxyhost=NULL;
    int benchtime=30;
    static const struct option long_options[]=
    {
        {"force",no_argument,&force,1},
        {"reload",no_argument,&force_reload,1},
        {"time",required_argument,NULL,'t'},
        {"help",no_argument,NULL,'?'},
        {"http09",no_argument,NULL,'9'},
        {"http10",no_argument,NULL,'1'},
        {"http11",no_argument,NULL,'2'},
        {"get",no_argument,&method,METHOD_GET},
        {"head",no_argument,&method,METHOD_HEAD},
        {"options",no_argument,&method,METHOD_OPTIONS},
        {"trace",no_argument,&method,METHOD_TRACE},
        {"version",no_argument,NULL,'V'},
        {"proxy",required_argument,NULL,'p'},
        {"clients",required_argument,NULL,'c'},
        {NULL,0,NULL,0}
    };
    int main(int argc,char *argv[])
    {
    
    
        if(argc==1)//没有带参数
        {
            usage();
            return 2;
        } 
        int opt;
        int options_index=0;
       
        while((opt=getopt_long(argc,argv,"912Vfrt:p:c:?h",long_options,&options_index))!=EOF )
        {
            switch(opt)
            {
                case  0 : break;
                case 'f': printf("f\n");break;
                case 'r': printf("r\n");break; 
                case '9': printf("9\n");break;
                case '1': printf("1\n");break;
                case '2': printf("2\n");break;
                case 'V': printf("V\n");exit(0);
                case 't': printf("t\n");break;       
                case 'p': 
                printf("p\n");break;
                case ':':
                case 'h':
                case '?': usage();return 2;break;
                case 'c': printf("c\n");break;
            }
        }
    
    
        return 0;
    }

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