los_strnlen_user.h 文件参考

浏览源代码.

函数
INT32	LOS_StrnlenUser (const CHAR *src, INT32 count)

函数说明

LOS_StrnlenUser()

INT32 LOS_StrnlenUser	(	const CHAR *	src,
		INT32	count
	)

在文件 strnlen_user.c 第 37 行定义.

{
    CHAR character;
    INT32 maxCount;
    INT32 i;
    size_t offset = 0;
 
    if ((!LOS_IsUserAddress((VADDR_T)(UINTPTR)src)) || (count <= 0)) {
        return 0;
    }
 
    maxCount = (LOS_IsUserAddressRange((VADDR_T)(UINTPTR)src, (size_t)count)) ? \
                count : (USER_ASPACE_TOP_MAX - (UINTPTR)src);
 
    for (i = 0; i < maxCount; ++i) {
        if (LOS_GetUser(&character, src + offset) != LOS_OK) {
            return 0;
        }
        ++offset;
        if (character == '\0') {
            return offset;
        }
    }
 
    return count + 1;
}

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