删除字符串中指定位置字符

#include<stdio.h>
#include<string.h>
#include<stdlib.h>

#define MAX_DATA_LENTH (20)
#define TRUE (0)
#define FALSE (-1)
#define MAX_CHAR_PER_LINE (5) 

typedef struct Ostring_s{
    unsigned char array[MAX_DATA_LENTH];
    unsigned int integer;
}Ostring_t;

void Ostring_delete(Ostring_t *string, int i, int j)
{
    int string_len = sizeof(Ostring_t);
    int len1, len2, len3;
    int k;
    unsigned char *str1 = NULL;
    unsigned char *str2 = NULL;
    unsigned char *str3 = NULL;
    
    /* 字符串分为三段 */
    len1 = i-1;
    len2 = j-i+1;
    len3 = string_len-j;
    
    /* 每一段的首地址 */
    str1 = (unsigned char *)string;
    str2 = str1+len1;
    str3 = str2+len2;
    
    printf("\r\nstring = 0x%x, str1 = 0x%x, str2 = 0x%x, str3 = 0x%x\r\n", string, str1, str2, str3);
    
    /* 删除中间段字符 */
    //memset(str2, 0, len2);
    for(k=0; k<len2; k++)
    {
        *(str2+k) = 0;
    }
    
    /* 复制字符串使连续 */
    //memcpy(str2, str3, len3);
    for(k=0; k<len3; k++)
    {
        *(str2+k) = *(str3+k);
    }
    
    /* 删除尾部字符 */
    //memset(str2+len3, 0, len2); 
    for(k=0; k<len2; k++)
    {
        *(str2+len3+k) = 0;     
    }       
}

void String_print(unsigned char *string, int length)
{
    int l;
    
    for(l = 0; l<length; l++)
    {
        if(0 == (l%MAX_CHAR_PER_LINE))
        {
            printf("\r\n");
        }
        printf("0x%-5x ",*(string+l));
    }
}

int main(void)
{
    /* 初始化 */
    Ostring_t *string;
    int string_len = sizeof(Ostring_t);
    string = (Ostring_t *)malloc(string_len);
    memset(string, 0, sizeof(Ostring_t));
    
    /* 赋值 */
    memcpy(string->array, "abcdefghijklmnopq", sizeof("abcdefghijklmnopq"));
    string->integer = 345;

    /* 完整打印 */ 
    printf("\r\nstring print before:\r\n");
    String_print((unsigned char*)string, string_len);
    
    /* 删除后打印 */
    Ostring_delete(string, 2,8);
    printf("\r\nstring printf after:\r\n");
    String_print((unsigned char*)string, string_len);
    
    free(string);

    return TRUE;
}

好像是这么回事，晚点整理总结