mirror of
https://github.com/DragonOS-Community/DragonOS.git
synced 2025-06-20 05:56:32 +00:00
new: string.h
This commit is contained in:
@ -1,31 +1,3 @@
|
||||
#include "glib.h"
|
||||
#include "string.h"
|
||||
|
||||
/**
|
||||
* @brief 测量来自用户空间的字符串的长度,会检验地址空间是否属于用户空间
|
||||
* @param src
|
||||
* @param maxlen
|
||||
* @return long
|
||||
*/
|
||||
long strnlen_user(const char *src, unsigned long maxlen)
|
||||
{
|
||||
|
||||
unsigned long size = strlen(src);
|
||||
// 地址不合法
|
||||
if (!verify_area((uint64_t)src, size))
|
||||
return 0;
|
||||
|
||||
return size <= maxlen ? size : maxlen;
|
||||
}
|
||||
|
||||
long strnlen(const char *src, unsigned long maxlen)
|
||||
{
|
||||
|
||||
if (src == NULL)
|
||||
return 0;
|
||||
register int __res = 0;
|
||||
while (src[__res] != '\0' && __res < maxlen)
|
||||
{
|
||||
++__res;
|
||||
}
|
||||
return __res;
|
||||
}
|
Reference in New Issue
Block a user