View the number of usb in linux

In linux, view the number of usb-Linux Enterprise Application-Linux server application information. For more information, see. Hanging out in the library at noon, I saw a dictionary of linux command syntax. I flipped through it, and my eyes fell onto lsusb, listing all the usb devices. Then I suddenly shouted out. So I came back and tried:

[Lbxwz @ localhost ~] $ Lsusb
Bus 005 Device 001: ID :0000
Bus 004 Device 001: ID :0000
Bus 003 Device 001: ID :0000
Bus 002 Device 002: ID 046d: c018 Logitech, Inc.
Bus 002 Device 001: ID :0000
Bus 001 Device 001: ID :0000

It's hard to read/proc/bus/usb/device files.

It turns out that the world is so big.

Haha

I have attached a statistical program about the number of usb, which is used to read the/proc/bus/usb/device file.

# Include "include. h"

# Ifdef USBPATH
# Define USBPATH "/proc/bus/usb/devices"
# Else
# Define USBPATH "/proc/bus/usb/devices"
# Endif

# Define BUFSIZE 512
# Define EXTENDSIZE 256

Int IfExistUSBInterface (char ** USBInterfacesName)
{
FILE * FileStream;
Char * FileArr;
Char * ArrFlag;
Char * HostUsbFlag;
Char * UsbNameFlag;
Char ArrFound [] = "Product ";
Char UsbName [32] = {0}; // used to store the USB name
Int UsbNum = 0; // count the number of USB
Int FileNum = 0; // count the number of characters in the Read File
Int BufSize;
Int I;

BufSize = BUFSIZE;
FileArr = (char *) malloc (BufSize * sizeof (char ));
ArrFlag = FileArr;

If (FileStream = fopen (USBPATH, "r") = NULL)
{
Printf ("File open error! \ N ");
Exit (0 );
}

While (! Feof (FileStream ))
{
* ArrFlag ++ = fgetc (FileStream );
FileNum ++;
If (FileNum> BufSize) // if the number of characters overflows, the space is allocated separately.
{
BufSize + = EXTENDSIZE;
FileArr = (char *) realloc (FileArr, BufSize * sizeof (char ));
If (FileArr = NULL)
{
Printf ("alloc error! \ N ");
Exit (0 );
}
ArrFlag = FileArr + FileNum;
}
}
* (ArrFlag-1) = '\ 0 ';
Fclose (FileStream );

ArrFlag = FileArr;
While (HostUsbFlag = strstr (ArrFlag, "B :"))! = NULL) // filter out the usb information on the non-master> board in the file Array
{
UsbNum ++;
HostUsbFlag = strstr (HostUsbFlag, ArrFound); // use HostUsbFlag to indicate the first address to access USB> information.
I = 0;
While (* HostUsbFlag! = '\ N ')
{
UsbName [I ++] = * (HostUsbFlag ++ );
}
UsbName = '\ 0 ';
UsbNameFlag = strtok (UsbName, "= ");
UsbNameFlag = strtok (NULL, "= ");
ArrFlag = HostUsbFlag;
Strncpy (* (USBInterfacesName-1 + UsbNum), UsbNameFlag, strlen (UsbNameFlag) + 1 );
}
Free (FileArr );
Return (UsbNum); // return the number of USB Interfaces
}