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swab函数 (#53)

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* swab函数

Signed-off-by: Yuqia <15287042733@163.com>

* 修正格式

Signed-off-by: Yuqia <15287042733@163.com>
Co-authored-by: fslongjin <longjin@RinGoTek.cn>
This commit is contained in:
DaJiYuQia
2022-10-07 15:45:49 +08:00
committed by GitHub
parent 9300757779
commit e62bbf13e5
5 changed files with 95 additions and 9 deletions
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10
kernel/common/unistd.h
View File

@ -25,4 +25,12 @@ pid_t fork(void);
*
* @return pid_t
*/
pid_t vfork(void);
pid_t vfork(void);
/**
* @brief 交换n字节
* @param src 源地址
* @param dest 目的地址
* @param nbytes 交换字节数
*/
void swab(void *restrict src, void *restrict dest, ssize_t nbytes);

18
kernel/lib/unistd.c
View File

@ -1,4 +1,5 @@
#include <common/unistd.h>
#include <common/glib.h>
/**
* @brief fork当前进程
@ -18,4 +19,21 @@ pid_t fork(void)
pid_t vfork(void)
{
return (pid_t)enter_syscall_int(SYS_VFORK, 0, 0, 0, 0, 0, 0, 0, 0);
}
void swab(void *restrict src, void *restrict dest, ssize_t nbytes)
{
unsigned char buf[32];
char *_src = src;
char *_dest = dest;
uint32_t transfer;
for (; nbytes > 0; nbytes -= transfer)
{
transfer = (nbytes > 32) ? 32 : nbytes;
memcpy(buf, _src, transfer);
memcpy(_src, _dest, transfer);
memcpy(_dest, buf, transfer);
_src += transfer;
_dest += transfer;
}
}