strcat字符串拼接函数

摘自linux内核4.11.1源码string.c

linux/lib/string.c

Copyright (C) 1991, 1992  Linus Torvalds

头文件：#include <string.h>

作用：字符串拼接函数，将字符串src拼接至dest目标存储区

参数：

dest：目标存储区

src：源字符串

返回值：

dest 目标存储区的地址

/**
* strcat - Append one %NUL-terminated string to another
* @dest: The string to be appended to
* @src: The string to append to it
*/

char *strcat(char *dest, const char *src)
{
char *tmp = dest;

while (*dest)
dest++;
while ((*dest++ = *src++) != '\0')
;
return tmp;
}