New options: --all and --no-main

* NEWS: Document --all and --no-main
* configure.ac: Version 1.5.90
* doc/cflow.texi: Document --all and --no-main
* src/cflow.h (all_functions): New extern.
* src/main.c: New options: -A (--all) and --no-main
* src/output.c (tree_output): Output all graphs if
all_functions is set or no main function is defined.

6 files changed, 72 insertions, 18 deletions

diff --git a/NEWS b/NEWS
index 11d811d..d469db2 100644
--- a/NEWS
+++ b/NEWS
@@ -1,8 +1,27 @@
-GNU cflow NEWS -- history of user-visible changes. 2016-05-17
-Copyright (C) 2005-2007, 2009-2011, 2014-2017 Sergey Poznyakoff
+GNU cflow NEWS -- history of user-visible changes. 2019-02-08
 See the end of file for copying conditions.
 
 Please send cflow bug reports to <bug-cflow@gnu.org>.
+
+Version 1.5.90 (Git)
+
+* New option --all (-A)
+
+Produce graphs for all global functions in the program.  Use this
+option if your program contains functions which are not directly
+reachable from main().
+
+The output consist of separate flow graphs for each global function
+defined in the program.  These graphs will be placed after the graph
+for main() (if it exists), and will be ordered lexicographically by
+the function name.
+
+* New option --no-main
+
+This option has the same effect as '--all', except that the graph for
+main() function (if it exists) is treated same way as all the other
+graphs, i.e. it will not be placed at the top of output, but in its
+place as per the lexicographic ordering of function names.
 
 
 Version 1.5, 2016-05-17
@@ -99,7 +118,7 @@ Initial version restored from 1997 snapshots.
 ----------------------------------------------------------------------
 * Copyright information:
 
-Copyright (C) 2005-2007, 2009, 2010, 2011, 2016 Sergey Poznyakoff
+Copyright (C) 2005-2019 Sergey Poznyakoff
 
    Permission is granted to anyone to make or distribute verbatim copies
    of this document as received, in any medium, provided that the
diff --git a/configure.ac b/configure.ac
index 35f55f8..4aa58aa 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,5 @@
 # This file is part of GNU cflow
-# Copyright (C) 2005, 2007, 2009, 2011, 2014-2016 Free Software
-# Foundation, Inc.
+# Copyright (C) 2005-2019 Free Software Foundation, Inc.
 #
 # Written by Sergey Poznyakoff
 #
@@ -18,7 +17,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 AC_PREREQ(2.61)
-AC_INIT([GNU cflow], [1.5], [bug-cflow@gnu.org])
+AC_INIT([GNU cflow], [1.5.90], [bug-cflow@gnu.org])
 AC_CONFIG_SRCDIR([src/cflow.h])
 AC_CONFIG_AUX_DIR([build-aux])
 AM_INIT_AUTOMAKE([1.11 gnits tar-ustar dist-bzip2 dist-xz std-options
diff --git a/doc/cflow.texi b/doc/cflow.texi
index 643a792..4d613ea 100644
--- a/doc/cflow.texi
+++ b/doc/cflow.texi
@@ -30,7 +30,7 @@ Published by the Free Software Foundation,
 51 Franklin Street, Fifth Floor
 Boston, MA 02110-1301, USA
 
-Copyright @copyright{} 2005, 2010, 2014-2017 Sergey Poznyakoff
+Copyright @copyright{} 2005-2019 Sergey Poznyakoff
 
 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.2 or
@@ -209,8 +209,8 @@ main() <int () at whoami.c:25>:
 the function called @code{main}.  It is convenient when analyzing a set
 of input files comprising an entire @code{C} program.  However, there
 are circumstances where a user would want to see only a part of
-the graph starting on particular function.  @command{Cflow}
-allows to select such function using @option{--main} (@option{-m})
+the graph starting on particular function.  One can instruct @command{cflow}
+to start output from the desiredfunction using @option{--main} (@option{-m})
 command line option.  Thus, running
 
 @example
@@ -231,6 +231,14 @@ who_am_i() <int who_am_i (void) at whoami.c:8>:
 @end group
 @end example
 
+Many programs (such as libraries or interpreters) define functions
+that are not directly reachable from the main function.  To produce
+flow graph for all functions in the program, use the @option{--all}
+(@option{-A}) option.  The output will then include separate flow
+graphs for each global function defined in the program.  These graphs
+will be placed after the graph for @code{main} (if it exists), and
+will be ordered lexicographically by the function name.
+
 @node Direct and Reverse
 @chapter Two Types of Flow Graphs.
 @cindex @option{--reverse}
@@ -1200,6 +1208,14 @@ configuration file.
 with a bullet (@bullet{}).
 
 @table @option
+@cindex @option{-A}
+@cindex @option{--all}
+@item -A
+@itemx --all
+     Produce graphs for all global functions in the program.  Use this
+option if your program contains functions, which are not directly
+reachable from @code{main} (@pxref{start symbol}).
+
 @cindex @option{-a}
 @cindex @option{--ansi}
 @cindex @option{--no-ansi}
@@ -1313,6 +1329,12 @@ For more information, @xref{Symbols}.
 @itemx --main=@var{name}
      Assume main function to be called @var{name}.  @xref{start symbol}.
 
+@cindex @option{--no-main}
+@item --no-main
+     There's no main function in the program.  This option has the
+same effect as @option{--all}, except that, if the program defines
+the @code{main} function, it will be treated as any other functions.
+
 @cindex @option{-n}
 @cindex @option{--number}
 @cindex @option{--no-number}
diff --git a/src/cflow.h b/src/cflow.h
index 1a5ec76..8779a68 100644
--- a/src/cflow.h
+++ b/src/cflow.h
@@ -1,6 +1,5 @@
 /* This file is part of GNU cflow
-   Copyright (C) 1997, 2005, 2007, 2009-2010, 2014-2017 Sergey
-   Poznyakoff
+   Copyright (C) 1997-2019 Sergey Poznyakoff
  
    GNU cflow is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -162,6 +161,7 @@ extern int brief_listing;
 extern int reverse_tree;
 extern int out_line;
 extern char *start_name;
+extern int all_functions;
 extern int max_depth;
 extern int emacs_option;
 extern int debug;
diff --git a/src/main.c b/src/main.c
index e67b3e0..a5535c7 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,6 +1,5 @@
 /* This file is part of GNU cflow
-   Copyright (C) 1997, 2005, 2007, 2009-2011, 2014-2017 Sergey
-   Poznyakoff
+   Copyright (C) 1997-2019 Sergey Poznyakoff
  
    GNU cflow is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -44,6 +43,7 @@ enum option_code {
      OPT_NO_TREE,
      OPT_NO_BRIEF,
      OPT_NO_EMACS,
+     OPT_NO_MAIN,
      OPT_NO_VERBOSE,
      OPT_NO_NUMBER,
      OPT_NO_PRINT_LEVEL,
@@ -105,6 +105,8 @@ static struct argp_option options[] = {
        N_("Register SYMBOL with given TYPE, or define an alias (if := is used). Valid types are: keyword (or kw), modifier, qualifier, identifier, type, wrapper. Any unambiguous abbreviation of the above is also accepted"), GROUP_ID+1 },
      { "main", 'm', N_("NAME"), 0,
        N_("Assume main function to be called NAME"), GROUP_ID+1 },
+     { "no-main", OPT_NO_MAIN, NULL, 0,
+       N_("There's no main function; print graphs for all functions in the program") },
      { "define", 'D', N_("NAME[=DEFN]"), 0,
        N_("Predefine NAME as a macro"), GROUP_ID+1 },
      { "undefine", 'U', N_("NAME"), 0,
@@ -121,6 +123,9 @@ static struct argp_option options[] = {
 #define GROUP_ID 20          
      { NULL, 0, NULL, 0,
        N_("Output control:"), GROUP_ID },
+     { "all", 'A', NULL, 0,
+       N_("Show all functions, not only those reachable from main"),
+       GROUP_ID+1 },
      { "number", 'n', NULL, 0,
        N_("* Print line numbers"), GROUP_ID+1 },
      { "no-number", OPT_NO_NUMBER, NULL, OPTION_HIDDEN,
@@ -216,7 +221,7 @@ char *level_begin = "";
 int preprocess_option = 0; /* Do they want to preprocess sources? */
 
 char *start_name = "main"; /* Name of start symbol */
-
+int all_functions;  
 struct linked_list *arglist;        /* List of command line arguments */
 
 /* Given the option_type array and (possibly abbreviated) option argument
@@ -512,6 +517,9 @@ parse_opt (int key, char *arg, struct argp_state *state)
      int num;
      
      switch (key) {
+     case 'A':
+          all_functions = 1;
+          break;
      case 'a':