C语言根据协议分割获取字符串单元

序列号    长度    状态字    数据长度   数据1   数据2    数据3

00001 00007 1   3  34567 26358 32698   
 (1)   (2) (3) (4)  (5)   (6)   (7)

(1)00001就是数字1，即代表序列号为1

(2)00007就是数字7，即代表长度为7

(3)1代表状态字

(4)3代表数字长度

(5)34567代表数据1

(6)26358代表数据2

(7)32698代表数据3

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
//根据空格拆分字符串 
int partition(char *src, char *par, int pos)
{
  int i,j;
  i = pos;
  //取得一个非空字符 
  while(src[i] == ' ')
    ++i;
  if(src[i] != '\0')
  {
    j = 0;
    while((src[i] != '\0') && (src[i] != ' '))
    {
        //判断条件是否满足 
        if((src[i] > '9') || (src[i] < '0') && (src[i] != '-'))
            return -1 ;
      par[j] = src[i];
      ++i;
      ++j;
    }
    par[j]='\0';
    return i;
  }
  else
    return -1;
}

int main(void)
{
    int serial_number ;
    int lenght ;
    int status ;
    int data_length;
    int data1,data2,data3; 

    int position = 0;
    int para_flag = 1 ; 
    int parameter_item = 0;
    char partition_string[20] = {0};
    char *data = "00001 00007 1 3 34567 26358 32698"; 
    while(para_flag)
    {
        if(para_flag == 0)
            break ; 
        if((position = partition(data,partition_string,position)) != -1)
        {
            ++parameter_item ;
            switch(parameter_item)
            {
                case 1:
                    serial_number = atoi(partition_string);
                    break ;
                case 2:
                    lenght = atoi(partition_string);
                    break ;
                case 3:
                    status = atoi(partition_string);    
                    break ;
                case 4:
                    data_length = atoi(partition_string);   
                    break ;
                case 5:
                    data1 = atoi(partition_string); 
                    break ;
                case 6:
                    data2 = atoi(partition_string); 
                    break ;
                case 7: 
                    data3 = atoi(partition_string); 
                    para_flag = 0 ;
                    break ;
            }
        }
    }
    printf("序号:%d\n",serial_number);
    printf("长度:%d\n",lenght);
    printf("状态字:%d\n",status);
    printf("数据长度:%d\n",data_length);
    printf("数据1:%d\n",data1);
    printf("数据2:%d\n",data2);
    printf("数据3:%d\n",data3);
    return 0;   
}