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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 ULTRIX

types

types(5)							File Formats Manual							  types(5)

Name
       types - primitive system data types

Syntax
       #include <sys/types.h>

Description
       The data defined in the include file are used in UNIX system code.  Some data of these are accessible to user code:
       #ifndef _TYPES_
       #define _TYPES_

       /* major part of a device */
       #define major(x)        ((int)(((unsigned)(x)>>8)&0377))

       /* minor part of a device */
       #define minor(x)        ((int)((x)&0377))

       /* make a device number */
       #define makedev(x,y)    ((dev_t)(((x)<<8) | (y)))

       typedef unsigned char   u_char;
       typedef unsigned short  u_short;
       typedef unsigned int    u_int;
       typedef unsigned long   u_long;
       typedef unsigned short  ushort;	       /* sys III compat */

       #ifdef mips
       typedef struct  _physadr { int r[1]; } *physadr;
       typedef struct  label_t {
	       int     val[12];
       } label_t;
       #endif
       typedef struct  _quad { long val[2]; } quad;
       typedef long    daddr_t;
       typedef char *  caddr_t;
       typedef u_long  ino_t;
       typedef long    swblk_t;
       typedef int     size_t;
       typedef int     time_t;
       typedef short   dev_t;
       typedef int     off_t;

       typedef struct  fd_set { int fds_bits[1]; } fd_set;
       #endif

       The  form  daddr_t is used for disk addresses except in an i-node on disk.  For further information, see Times are encoded in seconds since
       00:00:00 GMT, January 1, 1970.  The major and minor parts of a device code specify kind and unit number of a device and	are  installation-
       dependent.   Offsets  are measured in bytes from the beginning of a file.  The label_t variables are used to save the processor state while
       another process is running.

See Also
       dbx(1), lseek(2), time(3), fs(5)

								       RISC								  types(5)
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