C applet - key-value pair string

4. Key-value pair string

• Requirement 1: Ask yourself to define an interface to obtain the value according to the key
• Requirement 2: Write test cases
• Requirement 3: There may be more than n spaces in the middle of the key-value pair, remove the spaces

Such as:

"key1= value1";
"key2=      value2    ";
"key3=value3    ";
"key4=      value4";...

• 1
• 2
• 3
• 4
• 5

code

#define  _CRT_SECURE_NO_WARNINGS 
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
/*=====================================
    键值对字符串在开发中经常使用
    要求1：求自己定义一个接口，实现根据key获取value
    要求2：编写测试用例
    要求3： 键值对中间可能有n多个空格，求去除空格
===========================================*/

//去掉字符串前后空格
int trimSpace1(char *str, char *newstr)
{
    char *p = str;
    int ncount = 0;
    int i, j = 0;

    if (str == NULL || newstr == NULL)
    {
        printf("func trimSpace() \n");
        return -1;
    }

    i = 0;
    j = strlen(p) - 1;


    while (isspace(p[i]) && p[i] != '\0')
    {
        i++;
    }

    while (isspace(p[j]) && p[j] != '\0')
    {
        j--;
    }
    ncount = j - i + 1;

    strncpy(newstr, str + i, ncount);

    newstr[ncount] = '\0';

    return 0;
}

//根据key获取value
int getValueByKey(char *keyvaluebuf,char *keybuf,char *valuebuf)
{
    char *p = NULL;
    int ret = 0;
    if (keyvaluebuf == NULL || keybuf == NULL || valuebuf == NULL)
    {
        return -1;
    }

    //1.查找key是不是在母串中
    p = keyvaluebuf;
    p = strstr(p, keybuf);
    if (p == NULL)
    {
        return -1;
    }
    //让辅助指针变量 重新达到下一次检索的条件
    p = p + strlen(keybuf);

    //2.看有没有=号
    p = strstr(p, "=");
    if (p == NULL)
    {
        return -1;
    }
    //让辅助指针变量 重新达到下一次检索的条件
    p = p + strlen("=");

    //3.在等号后面 去除空格
    ret = trimSpace1(p, valuebuf);
    if (ret != 0)
    {
        printf("func trimSpace1() err:%d \n",ret);
        return ret;
    }

    return 0;
}
int main()
{
    int ret = 0;
    int buf[1024];
    char *keyandvalue = "key2=      value2    ";
    char *key = "key2";
    ret = getValueByKey(keyandvalue,key,buf);
    if (ret != 0)
    {
        printf("func getKeyByValue() err:%d \n",ret);
        return ret;
    }
    printf("buf:%s\n",buf);
    system("pause");

    return ret;
}

• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• 23
• 24
• 25
• 26
• 27
• 28
• 29
• 30
• 31
• 32
• 33
• 34
• 35
• 36
• 37
• 38
• 39
• 40
• 41
• 42
• 43
• 44
• 45
• 46
• 47
• 48
• 49
• 50
• 51
• 52
• 53
• 54
• 55
• 56
• 57
• 58
• 59
• 60
• 61
• 62
• 63
• 64
• 65
• 66
• 67
• 68
• 69
• 70
• 71
• 72
• 73
• 74
• 75
• 76
• 77
• 78
• 79
• 80
• 81
• 82
• 83
• 84
• 85
• 86
• 87
• 88
• 89
• 90
• 91
• 92
• 93
• 94
• 95
• 96
• 97
• 98
• 99
• 100
• 101
• 102
• 103

operation result