strsep使用范例

最新推荐文章于 2024-03-21 17:25:23 发布

dumb_man

最新推荐文章于 2024-03-21 17:25:23 发布

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分类专栏： c语言基本概念

本文链接：https://blog.youkuaiyun.com/dahailantian1/article/details/78584710

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本文介绍了一个使用C语言实现的字符串解析程序。通过strsep函数，该程序能够将字符串分割成多个令牌。示例代码展示了如何从字符串中提取令牌并更新指针指向下一个令牌的位置。

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extract tokens from string in a loop return

program.c copy

?

         #include <stdio.h>
        

         #include <string.h>
        

         int 
         main()
        

{

             
         char 
         string[] = 
         "A B C"
         ;
        

             
         char 
         *stringp = string;

             
         char 
         *token;

             
         while 
         (stringp != NULL) {

                 
         token = strsep(&stringp, delim);
        

                 
         puts
         (token);

}

             
         return 
         0;

}

Output

?

1

2

3

A

B

C

         extract tokens from string   return
program.c   copy
             ?
            
                 1
                
                 2
                
                 3
                
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                 40
                
                  #include <stdio.h>
                 
                  #include <string.h>
                 
                  void 
                  dump_stringp(
                  char 
                  *string, 
                  char 
                  *stringp)
                 
                  {
                 
                  }
                 
                  int 
                  main()
                 
                  {
                 
                  char 
                  string[] = 
                  "A B C"
                  ;
                 
                  char 
                  *stringp = string;
                 
                  const 
                  char 
                  *delim = 
                  " "
                  ;
                 
                  char 
                  *token;
                 
                  // stringp is updated to point to the next token 'B'
                 
                  token = strsep(&stringp, delim); 
                 
                  printf
                  (
                  "token = '%s', "
                  , token);
                 
                  if 
                  (stringp == NULL)
                 
                  printf
                  (
                  "stringp == NULL\n"
                  );
                 
                  else
                 
                  printf
                  (
                  "stringp - string = %d\n"
                  , stringp - string);
                 
                  // stringp is updated to point to the next token 'C'
                 
                  token = strsep(&stringp, delim); 
                 
                  printf
                  (
                  "token = '%s', "
                  , token);
                 
                  if 
                  (stringp == NULL)
                 
                  printf
                  (
                  "stringp == NULL\n"
                  );
                 
                  else
                 
                  printf
                  (
                  "stringp - string = %d\n"
                  , stringp - string);
                 
                  // In case no delimiter was found, stringp is made NULL.
                 
                  token = strsep(&stringp, delim); 
                 
                  printf
                  (
                  "token = '%s', "
                  , token);
                 
                  if 
                  (stringp == NULL)
                 
                  printf
                  (
                  "stringp = NULL\n"
                  );
                 
                  else
                 
                  printf
                  (
                  "stringp - string = %d\n"
                  , stringp - string);
                 
                  return 
                  0;
                 
                  }
                 
Output
             ?
            
                 1
                
                 2
                
                 3
                
                  token = 
                  'A'
                  , stringp - string = 2
                 
                  token = 
                  'B'
                  , stringp - string = 4
                 
                  token = 
                  'C'
                  , stringp = NULL