getopt/getopt_long小试

     今天早早地起床，看了一下最近一直想看的c命令行解析，之前在《c和指针》上已经将argc和argv了解了，今天主要的目标是getopt() getopt_long这两个库函数，以下是根据网上一哥们的笔记写的两个小程序

[root@bjxdurs235 20091122]# jobs
[1]-  Stopped                 vim my_getopt.c
[2]+  Stopped                 vim my_getopt_long.c
[root@bjxdurs235 20091122]# cat -n my_getopt.c
     1  #include
     2  #include
     3
     4  int main(int argc , char **argv)
     5  {
     6
     7          int op;
     8          char *my_optarg;
     9
    10          opterr = 0;
    11          while( ( op = getopt( argc, argv, "ngl:" ) ) != -1 ){
    12                  switch(op){
    13                          case 'n':
    14                                  printf("my name is : liufeng\n");
    15                                  break;
    16                          case 'g':
    17                                  printf("my girlfriend name is : zhangning\n");
    18                                  break;
    19                          case 'l':
    20                                  my_optarg = optarg;
    21                                  printf("Our love is : %s\n",my_optarg);
    22                                  break;
    23                          case '?':
    24                                  fputs("argumnet error !\n",stderr);
    25                                  break;
    26
    27                  }
    28
    29          }
    30          printf("optind:%d\n",optind);
    31
    32          return 0;
    33
    34  }
[root@bjxdurs235 20091122]# cat -n my_getopt_long.c
     1  #include
     2  #include
     3
     4  int do_name, do_gf_name;
     5  char *l_opt_arg;
     6
     7  struct option longopts[] = {
     8          { "name", no_argument, &do_name, 1 },
     9          { "gf_name", no_argument, &do_gf_name, 1 },
    10          { "love", required_argument, NULL, 'l' },
    11          { 0, 0, 0, 0},
    12  };
    13
    14  int main(int argc, char *argv[])
    15  {
    16          int c;
    17          opterr = 0;
    18          while((c = getopt_long(argc, argv, "l:", longopts, NULL)) != -1){
    19                  switch (c){
    20                          case 'l':
    21                                  l_opt_arg = optarg;
    22                                  printf("Our love is %s!\n", l_opt_arg);
    23                                  break;
    24                          case 0:
    25                                  printf("getopt_long() set env :do_name = %d\n", do_name);
    26                                  printf("getopt_long() set env :do_gf_name = %d\n", do_gf_name);
    27                                  break;
    28                          case '?':
    29                                  fputs("argumnet error!\n",stderr);
    30                                  break;
    31                  }
    32          }
    33          return 0;
    34  }
    35

程序主体转载自：http://blog.chinaunix.net/u2/82009/showart_1888571.html

    自己写完后，虽然比较简单，但是比纯粹地看别人的代码，还是加深了理解，看的时候更容易理解了