字符串复制strncpy

Posted 2020-06-15

1 #include "stdafx.h"
 2 #include "iostream"
 3 #include "assert.h"
 4 
 5 using namespace std;
 6 
 7 char* mystrncpy(char* dest, const char* src, int n)
 8 {
 9     assert(dest!=NULL && src!=NULL);
10     int count = 0;
11     while (*src != ‘\0‘)
12     {
13         if (count >= n)
14         {
15             break;
16         }
17         dest[count++] = *src++;
18     }
19     dest[count] = ‘\0‘;
20     return dest;
21 }
22 
23 int main(int argc, char* argv[])
24 {
25     printf("Hello World!\n");
26     char buf[10] = {0};
27     mystrncpy(buf, "FUCK!", 4);
28     cout << buf << endl;
29     return 0;
30 }

输出：

Hello World!

FUCK!

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