【C语言库函数源代码】

【本程序在Dev C++ 4.9.9.2 下编译通过】

/*

   Appends at most count characters of the string back onto the end of front, and ALWAYS terminates with a null character.If count is greater than the length of back, the length of back is used instead.(Unlike strncpy, this routine does not pad out to count characters).

   把src所指字符串的前n个字符添加到dest结尾处(覆盖dest结尾处的'\0')并添加'\0'。

   src和dest所指内存区域不可以重叠且dest必须有足够的空间来容纳src的字符串。

   返回指向dest的指针。

*/

char * my_strncat(char *dest,const char *source,int count)

{

   char *p = dest;

   while (*p) p++;

   while (count-- && (*p++ = *source++));

   *p = '\0';

   return(dest);

}

int main()

{

   char a[20] = "ammana_";

   puts(my_strncat(a,"babi",10));

   system("pause");

   return 0;

}