turned passwd.c into group.c; fixed error message wording; added group/gid abstractions

svn path=/trunk/externals/hcs/; revision=5202

1 files changed, 263 insertions, 0 deletions

diff --git a/group.c b/group.c
new file mode 100644
index 0000000..3d9bf17
--- /dev/null
+++ b/group.c
@@ -0,0 +1,263 @@
+/* --------------------------------------------------------------------------*/
+/*                                                                           */
+/* converts a GID number to a user name symbol                               */
+/* Written by Hans-Christoph Steiner <hans@at.or.at>                         */
+/*                                                                           */
+/* Copyright (c) 2006 Hans-Christoph Steiner                                 */
+/*                                                                           */
+/* This program is free software; you can redistribute it and/or             */
+/* modify it under the terms of the GNU General Public License               */
+/* as published by the Free Software Foundation; either version 2            */
+/* of the License, or (at your option) any later version.                    */
+/*                                                                           */
+/* See file LICENSE for further informations on licensing terms.             */
+/*                                                                           */
+/* This program is distributed in the hope that it will be useful,           */
+/* but WITHOUT ANY WARRANTY; without even the implied warranty of            */
+/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             */
+/* GNU General Public License for more details.                              */
+/*                                                                           */
+/* You should have received a copy of the GNU General Public License         */
+/* along with this program; if not, write to the Free Software Foundation,   */
+/* Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.           */
+/*                                                                           */
+/* --------------------------------------------------------------------------*/
+
+#ifndef _WIN32 // this doesn't work on Windows (yet?)
+
+#include <m_pd.h>
+
+#ifdef _WIN32
+#define _WIN32_WINNT 0x0400
+#include <windows.h>
+#include <stdio.h>
+#include <lm.h>
+#else
+#include <stdlib.h>
+#include <grp.h>
+#endif
+
+#include <string.h>
+
+static char *version = "$Revision: 1.1 $";
+
+t_int group_instance_count;
+
+#define DEBUG(x)
+//#define DEBUG(x) x 
+
+/*------------------------------------------------------------------------------
+ *  CLASS DEF
+ */
+static t_class *group_class;
+
+typedef struct _group {
+	t_object            x_obj;
+	t_float             x_gid;  
+/* output */
+	t_atom              *output; // holder for a list of atoms to be outputted
+	t_int               output_count;  // number of atoms in in x->output 
+	t_outlet            *x_data_outlet;
+	t_outlet            *x_status_outlet;
+} t_group;
+
+/*------------------------------------------------------------------------------
+ * SUPPORT FUNCTIONS
+ */
+
+/* add one new atom to the list to be outputted */
+static void add_atom_to_output(t_group *x, t_atom *new_atom)
+{
+    t_atom *new_atom_list;
+
+	new_atom_list = (t_atom *)getbytes((x->output_count + 1) * sizeof(t_atom));
+	memcpy(new_atom_list, x->output, x->output_count * sizeof(t_atom));
+	freebytes(x->output, x->output_count * sizeof(t_atom));
+	x->output = new_atom_list;
+	memcpy(x->output + x->output_count, new_atom, sizeof(t_atom));
+	++(x->output_count);
+}
+
+static void add_symbol_to_output(t_group *x, t_symbol *s)
+{
+	t_atom *temp_atom = getbytes(sizeof(t_atom));
+	SETSYMBOL(temp_atom, s); 
+	add_atom_to_output(x,temp_atom);
+	freebytes(temp_atom,sizeof(t_atom));
+}
+		
+static void add_float_to_output(t_group *x, t_float f)
+{
+	t_atom *temp_atom = getbytes(sizeof(t_atom));
+	SETFLOAT(temp_atom, f);
+	add_atom_to_output(x,temp_atom);
+	freebytes(temp_atom,sizeof(t_atom));
+}
+
+static void reset_output(t_group *x)
+{
+	if(x->output)
+	{
+		freebytes(x->output, x->output_count * sizeof(t_atom));
+		x->output = NULL;
+		x->output_count = 0;
+	}
+}
+
+/*------------------------------------------------------------------------------
+ * IMPLEMENTATION                    
+ */
+
+static void group_output(t_group *x)
+{
+	DEBUG(post("group_output"););
+	struct group *group_pointer;
+	char **members;
+
+#ifdef _WIN32
+	/* TODO: implement for Windows! */
+#else
+	if( x->x_gid < 0 )
+	{
+		post("[group]: ignoring bad username or GID less than zero");
+		outlet_bang(x->x_status_outlet);
+	}
+	else
+	{
+		group_pointer = getgrgid((gid_t)x->x_gid);
+		if( group_pointer != NULL )
+		{
+			reset_output(x);
+			add_symbol_to_output(x, gensym(group_pointer->gr_passwd));
+			add_float_to_output(x, group_pointer->gr_gid);
+			members = group_pointer->gr_mem;
+			while(*members)
+			{
+				add_symbol_to_output(x, gensym( *(members) ));
+				members++;
+			}
+			outlet_anything(x->x_data_outlet, gensym(group_pointer->gr_name), 
+							x->output_count, x->output);
+		}
+		else
+		{
+			outlet_bang(x->x_status_outlet);
+		}
+	}
+#endif /* _WIN32 */
+}
+
+
+static t_float get_gid_from_arguments(int argc, t_atom *argv)
+{
+	t_symbol *first_argument;
+	t_float gid = -1;
+	struct group *group_pointer;
+
+	if(argc == 0) return(0);
+
+	if(argc != 1)
+		post("[group]: too many arguments (%d), ignoring all but the first", 
+			 argc);
+
+	first_argument = atom_getsymbolarg(0,argc,argv);
+	if(first_argument == &s_) 
+	{ // single float arg means GID #
+		gid = atom_getfloatarg(0,argc,argv);
+		if( gid < 0 )
+		{
+			error("[group]: GID less than zero not allowed (%d)", gid);
+			return(-1);
+		}
+	}
+	else
+	{ // single symbol arg means username
+		group_pointer = getgrnam(first_argument->s_name);
+		if( group_pointer != NULL )
+			return((t_float) group_pointer->gr_gid);
+		else
+			return(-1);
+	}
+	return(-1);
+}
+
+
+static void group_set(t_group *x, t_symbol *s, int argc, t_atom *argv)
+{
+    /* get rid of the unused variable warning with the if() statement */
+	if( strcmp(s->s_name, "set") == 0 ) 
+		x->x_gid = get_gid_from_arguments(argc, argv);
+}
+
+
+static void group_float(t_group *x, t_float f) 
+{
+	x->x_gid = f;
+	group_output(x);
+}
+
+static void group_symbol(t_group *x, t_symbol *s) 
+{
+	t_atom argv[1];
+	SETSYMBOL(argv, s);
+	group_set(x, gensym("set"), 1, argv);
+	group_output(x);
+}
+
+
+static void *group_new(t_symbol *s, int argc, t_atom *argv) 
+{
+	DEBUG(post("group_new"););
+
+	t_group *x = (t_group *)pd_new(group_class);
+
+	if(!group_instance_count) 
+	{
+		post("[group] %s",version);  
+		post("\twritten by Hans-Christoph Steiner <hans@at.or.at>");
+		post("\tcompiled on "__DATE__" at "__TIME__ " ");
+	}
+	group_instance_count++;
+
+    floatinlet_new(&x->x_obj, &x->x_gid);
+	x->x_data_outlet = outlet_new(&x->x_obj, 0);
+	x->x_status_outlet = outlet_new(&x->x_obj, 0);
+
+	group_set(x, gensym("set"), argc, argv);
+
+	return (x);
+}
+
+
+void group_free(void) 
+{
+#ifdef _WIN32
+#else
+	endgrent();
+#endif /* _WIN32 */	
+}
+
+
+void group_setup(void) 
+{
+	DEBUG(post("group_setup"););
+	group_class = class_new(gensym("group"), 
+								  (t_newmethod)group_new, 
+								  0,
+								  sizeof(t_group), 
+								  0, 
+								  A_GIMME, 
+								  0);
+	/* add inlet datatype methods */
+	class_addbang(group_class, (t_method) group_output);
+	class_addfloat(group_class, (t_method) group_float);
+	class_addsymbol(group_class, (t_method) group_symbol);
+	/* add inlet message methods */
+	class_addmethod(group_class,
+					(t_method) group_set,
+					gensym("set"), 
+					A_GIMME, 
+					0);
+}
+
+#endif /* NOT _WIN32 */