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decl.awk

#!/usr/bin/awk -f

# parse a C declaration by recursive descent
# based on a C program in KR ANSI edition
#
# run on a C file it finds the declarations
#
# restrictions: one declaration per line
#               doesn't understand struct {...}
#               makes assumptions about type names
#
#
#  some awks need double escapes on strings used as
#  regular expressions.  If not run on mawk, use gdecl.awk

################################################
#   lexical scanner -- gobble()
#   input : string s -- treated as a regular expression
#   gobble eats SPACE, then eats longest match of s off front
#   of global variable line.
#   Cuts the matched part off of line
#

function gobble(s,  x)  
{
  sub( /^ /, "", line)  # eat SPACE if any

# surround s with parenthesis to make sure ^ acts on the
  # whole thing

match(line, "^" "(" s ")")
  x = substr(line, 1, RLENGTH)
  line = substr(line, RLENGTH+1)
  return x 
}

function ptr_to(n,  x)  # print "pointer to" , n times
{ n = int(n)
  if ( n <= 0 )  return ""
  x = "pointer to" ; n--
  while ( n-- )  x = x " pointer to"
  return x
}

#recursively get a decl
# returns an english description of the declaration or
# "" if not a C declaration.

function  decl(   x, t, ptr_part)
{

x = gobble("[* ]+")   # get list of *** ...
  gsub(/ /, "", x)   # remove all SPACES
  ptr_part = ptr_to( length(x) )

# We expect to see either an identifier or '('
  #

if ( gobble("\(") )
  { 
    # this is the recursive descent part
    # we expect to match a declaration and closing ')'
    # If not return "" to indicate  failure

if ( (x = decl()) == "" || gobble( "\)" ) == "" ) return ""

}
  else  #  expecting an identifier
  {
    if ( (x = gobble(id)) == "" )  return ""
    x = x ":"
  }

# finally look for ()
  # or  [ opt_size ]

while ( 1 )
     if ( gobble( funct_mark ) )  x = x " function returning"
     else
     if ( t = gobble( array_mark ) )
     { gsub(/ /, "", t)
       x = x " array" t " of"
     }
     else  break

x = x " "  ptr_part
   return x
}

BEGIN { id = "[_A-Za-z][_A-Za-z0-9]*" 
        funct_mark = "$[ \t]*$"
	array_mark = "\[[ \t]*[_A-Za-z0-9]*[ \t]*\]"

# I've assumed types are keywords or all CAPS or end in _t
# Other conventions could be added.

types = "(" type0 "|" type1 "|" type2 ")"
}

{

gsub( "/\*([^*]|\*[^/])*(\*/|$)" , " ") # remove comments
    gsub( /[ \t]+/, " ")  # squeeze white space to a single space

line = $0

scope = gobble( "extern|static" )

if ( type = gobble("(struct|union|enum) ") )
    		type = type gobble(id)  #  get the tag
    else
    {

type = gobble("(un)?signed ") gobble( types )

}
    
    if ( ! type )  next
    
    if ( (x = decl()) && gobble( ";") )
    {
      x  =  x " " type
      if ( scope )  x = x " (" scope ")"
      gsub( /  +/, " ", x)  # 
      print x
    }

}

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2021-01-20 01:11:42
..	dir	-	root/root	0755	2021-01-20 01:11:42
ct_length.awk	text/plain	407 B	root/root	0755	2008-09-09 08:52:55
decl.awk	text/x-awk	2.97 KB	root/root	0755	2008-09-09 08:52:55
deps.awk	text/plain	1.28 KB	root/root	0755	2008-09-09 08:52:55
eatc.awk	text/plain	492 B	root/root	0755	2008-09-09 08:52:55
gdecl.awk	text/plain	2.73 KB	root/root	0755	2012-12-09 11:03:11
hcal	text/plain	13.72 KB	root/root	0755	2008-09-09 08:52:55
hical	text/x-shellscript	2.89 KB	root/root	0755	2009-08-21 12:36:34
nocomment.awk	text/plain	590 B	root/root	0755	2008-09-09 08:52:55
primes.awk	text/plain	1.03 KB	root/root	0755	2008-09-09 08:52:55
qsort.awk	text/plain	1.07 KB	root/root	0755	2020-01-20 11:52:31

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