Question

Is there a way for ctags to handle multiline function prototypes in C?

I ve searched around and the --fields=+S is supposed to do multiline prototypes, but I can t get it to work:

ctags -x --c-kinds=pf --fields=+S file

file:

int 
foo(int
    x, int y
    );

ctags only returns:

foo(int

(Note that the return type is also missing)

Ultimately I would like to get an output similar to

int foo(int x, int y);

or

int foo(int x, int y

is --fields=+S not the correct way? Are there part of the ctags fields that I am missing? Any pointers in general?

If there is not a way to do it in ctags, any recommended programs? (I m currently looking at uncrustify)

Answer 1

I was unable to find anything with ctags so I wrote a python script to re-arrange my file so that ctags could capture the prototypes.

Note: my code had comments and so much of this takes care with removing them (otherwise they would get in the way of ctags).

Manipulations were done in this order:

# concat to one line
file_str =   
for line in read_from.readlines():
    file_str += line

# remove all /* */ comments
file_str = re.sub( /*(.|[
])*?*/ ,   , file_str)

# remove  //  comments
file_str = re.sub( //.* ,   , file_str)

# split on  
 
file_as_list = file_str.splitlines(True)

# strip everything
for index in range(len(file_as_list)):
    file_as_list[index] = file_as_list[index].strip()

# add in newlines where appropriate
for line in file_as_list:
    # if the line ends in  ;  or  } 
    if line.endswith( ; ) or line.endswith( } ):
        # append a newline to the stripped line
        write_to.write(line.strip() +  
 )
    else:
        # append a space to the stripped line
        write_to.write(line.strip() +    )

Answer 2

I had the same issue with my code but I couldn t modify it. When I use the --fields=+S parameter, it seem to work because I get an additional line in the tag file. The signature: part contains all the parameters of the function.

CopyToTX26 D:BiseLMy DropboxWork_BSWPKG_CMDMemory.c /^void CopyToTX26( uint16 memory_ID, uint32 ** pt_data_address, uint32 nb_recover, $/;" f signature:( uint16 memory_ID, uint32 ** pt_data_address, uint32 nb_recover, uint32 * nb_copied, uint32 max_length )

Answer 3

--_xformat option may help you.

[jet@localhost ~]$ cat /tmp/foo.h
int 
foo(int
    x, int y
    );
[jet@localhost ~]$ ~/var/ctags/ctags -x --c-kinds=pf --_xformat="%-16N %4n %-16F %C %S" /tmp/foo.h
foo                 2 /tmp/foo.h       foo(int (int x,int y)

Answer 4

You can remove unneeded line breaks with a simple filter, e.g.

 tr  
       | sed  s/([{};])/1
/g

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