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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 CENTOS

locale::codes::langext

Locale::Codes::LangExt(3)				User Contributed Perl Documentation				 Locale::Codes::LangExt(3)

NAME

       Locale::Codes::LangExt - standard codes for language extension identification

SYNOPSIS

	  use Locale::Codes::LangExt;

	  $lext = code2langext('acm');		       # $lext gets 'Mesopotamian Arabic'
	  $code = langext2code('Mesopotamian Arabic'); # $code gets 'acm'

	  @codes   = all_langext_codes();
	  @names   = all_langext_names();

DESCRIPTION

       The "Locale::Codes::LangExt" module provides access to standard codes used for identifying language extensions, such as those as defined in
       the IANA language registry.

       Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default IANA language
       registry codes will be used.

SUPPORTED CODE SETS

       There are several different code sets you can use for identifying language extensions. A code set may be specified using either a name, or
       a constant that is automatically exported by this module.

       For example, the two are equivalent:

	  $lext = code2langext('acm','alpha');
	  $lext = code2langext('acm',LOCALE_LANGEXT_ALPHA);

       The codesets currently supported are:

       alpha
	   This is the set of three-letter (lowercase) codes from the IANA language registry, such as 'acm' for Mesopotamian Arabic.

	   This is the default code set.

ROUTINES

       code2langext ( CODE [,CODESET] )
       langext2code ( NAME [,CODESET] )
       langext_code2code ( CODE ,CODESET ,CODESET2 )
       all_langext_codes ( [CODESET] )
       all_langext_names ( [CODESET] )
       Locale::Codes::LangExt::rename_langext  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Codes::LangExt::add_langext  ( CODE ,NAME [,CODESET] )
       Locale::Codes::LangExt::delete_langext  ( CODE [,CODESET] )
       Locale::Codes::LangExt::add_langext_alias  ( NAME ,NEW_NAME )
       Locale::Codes::LangExt::delete_langext_alias  ( NAME )
       Locale::Codes::LangExt::rename_langext_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangExt::add_langext_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangExt::delete_langext_code_alias  ( CODE [,CODESET] )
	   These routines are all documented in the Locale::Codes::API man page.

SEE ALSO

       Locale::Codes
	   The Locale-Codes distribution.

       Locale::Codes::API
	   The list of functions supported by this module.

       http://www.iana.org/assignments/language-subtag-registry
	   The IANA language subtag registry.

AUTHOR

       See Locale::Codes for full author history.

       Currently maintained by Sullivan Beck (sbeck@cpan.org).

COPYRIGHT

	  Copyright (c) 2011-2013 Sullivan Beck

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.16.3							    2013-02-27						 Locale::Codes::LangExt(3)
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