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Full Discussion: Get struct definition
Top Forums Programming Get struct definition Post 302934104 by migurus on Wednesday 4th of February 2015 05:18:49 PM
Old 02-04-2015
Get struct definition
I have many headers with huge amount of structures in them, typical one looks like this:

Code:
$ cat a.h
struct Rec1 {
        int     f1;
        int     f2;
};
 struct Rec2 {
        char    r1;
        char    r2;
};
 struct Rec3 {
        int     f1;
        float   k1;
        float   k2;
};

To quickly look at a given definition I do this:
Code:
$ sed -n "/Rec2/,/^$/p" a.h
struct Rec2 {
        char    r1;
        char    r2;
};

I use an alias for the command and it is easy and quick, works in all systems where I need it.

Now I inherited headers with this type of definition:
Code:
$ cat b.h
typedef struct {
        int     f1;
        int     f2;
}Rec1;
typedef struct {
        char    r1;
        char    r2;
}Rec2;
typedef struct {
        int     f1;
        float   k1;
        float   k2;
}Rec3;

so my simple sed does not work anymore. Any idea how to deal with this format?

I thought of awk:
Code:
awk 'BEGIN{ n = 1; }
{
        if($0 ~ "typedef") {
                n=1;
        }
        arr[n]=$0;
        n++;
        if($0 ~ "Rec2") {
                for(i=1;i<=n;i++)
                        print arr[i];
        }
}' b.h

but I don't like it - too complex for a simple alias I can carry with me in different environments I deal with. And I am not sure awk is available everywhere. Any bash/sed based ideas?
 

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LEARN ABOUT X11R4

xquerydevicestate

XQueryDeviceState(3)						    X FUNCTIONS 					      XQueryDeviceState(3)

NAME

       XQueryDeviceState - query the state of an extension input device.

SYNTAX

       int XQueryDeviceState(Display *display, XDevice *device);

ARGUMENTS

       display	   Specifies the connection to the X server.

       device	   Specifies the device whose state is to be queried.

DESCRIPTION

       The  XQueryDeviceState  request	queries  the  state of an input device.  The current state of keys and buttons (up or down), and valuators
       (current value) on the device is reported by this request.  Each key or button is represented by a bit in the XDeviceState  structure  that
       is  returned.   Valuators  on  the  device report 0 if they are reporting relative information, and the current value if they are reporting
       absolute information.

       XQueryDeviceState can generate a BadDevice error.

STRUCTURES

       The XDeviceState structure contains:

       typedef struct {
	    XID device_id;
	    int num_classes;
	    XInputClass *data;
       } XDeviceState;

       The XValuatorState structure contains:

       typedef struct {
	    unsigned char class;
	    unsigned char length;
	    unsigned char num_valuators;
	    unsigned char mode;
	    int *valuators;
       } XValuatorState;

       The XKeyState structure contains:

       typedef struct {
	    unsigned char class;
	    unsigned char length;
	    short	  num_keys;
	    char keys[32];
       } XKeyState;

       The XButtonState structure contains:

       typedef struct {
	    unsigned char class;
	    unsigned char length;
	    short	  num_buttons;
	    char buttons[32];
       } XButtonState;

DIAGNOSTICS

       BadDevice   An invalid device was specified.  The specified device does not exist or has not been opened by this client	via  XOpenInputDe-
		   vice.   This  error	may  also occur if some other client has caused the specified device to become the X keyboard or X pointer
		   device via the XChangeKeyboardDevice or XChangePointerDevice requests.

SEE ALSO

       Programming with Xlib

X Version 11							    libXi 1.2.1 					      XQueryDeviceState(3)
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