Description: Patch to allow usernames longer than 20 characters.
Source: http://www.mail-archive.com/screen-devel@gnu.org/msg00186.html
Author: Steve Kemp
Upstream-Bug: http://savannah.gnu.org/bugs/?21653
Debian-Bug: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=560231
Ubuntu-Bug: https://bugs.launchpad.net/ubuntu/+source/screen/+bug/582153

Index: screen/acconfig.h
===================================================================
--- screen.orig/acconfig.h	2011-10-08 21:20:48.000000000 +0200
+++ screen/acconfig.h	2011-10-08 21:20:57.000000000 +0200
@@ -39,6 +39,13 @@
 #endif
 
 /*
+ * Length of longest username.
+ */
+#ifndef MAX_USERNAME_LEN
+# define MAX_USERNAME_LEN 50
+#endif
+
+/*
  * Define SOCKDIR to be the directory to contain the named sockets
  * screen creates. This should be in a common subdirectory, such as
  * /usr/local or /tmp. It makes things a little more secure if you
Index: screen/acls.c
===================================================================
--- screen.orig/acls.c	2011-10-08 21:20:48.000000000 +0200
+++ screen/acls.c	2011-10-08 21:20:57.000000000 +0200
@@ -182,7 +182,7 @@
 #endif
   (*up)->u_Esc = DefaultEsc;
   (*up)->u_MetaEsc = DefaultMetaEsc;
-  strncpy((*up)->u_name, name, 20);
+  strncpy((*up)->u_name, name, MAX_USERNAME_LEN);
   (*up)->u_password = NULL;
   if (pass)
     (*up)->u_password = SaveStr(pass);
@@ -318,8 +318,8 @@
     return UserAdd(name, pass, up);
   if (!strcmp(name, "nobody"))		/* he remains without password */
     return -1;
-  strncpy((*up)->u_password, pass ? pass : "", 20);
-  (*up)->u_password[20] = '\0';
+  strncpy((*up)->u_password, pass ? pass : "", MAX_USERNAME_LEN);
+  (*up)->u_password[MAX_USERNAME_LEN] = '\0';
   return 0;
 }
 #endif
Index: screen/acls.h
===================================================================
--- screen.orig/acls.h	2011-10-08 21:20:48.000000000 +0200
+++ screen/acls.h	2011-10-08 21:20:57.000000000 +0200
@@ -78,7 +78,7 @@
 typedef struct acluser
 {
   struct acluser *u_next;		/* continue the main user list */
-  char u_name[20+1];		/* login name how he showed up */
+  char u_name[MAX_USERNAME_LEN+1];	/* login name how he showed up */
   char *u_password;		/* his password (may be NullStr). */
   int  u_checkpassword;		/* nonzero if this u_password is valid */
   int  u_detachwin;		/* the window where he last detached */
Index: screen/screen.c
===================================================================
--- screen.orig/screen.c	2011-10-08 21:20:56.000000000 +0200
+++ screen/screen.c	2011-10-08 21:20:57.000000000 +0200
@@ -997,7 +997,7 @@
 
   if (home == 0 || *home == '\0')
     home = ppp->pw_dir;
-  if (strlen(LoginName) > 20)
+  if (strlen(LoginName) > MAX_USERNAME_LEN)
     Panic(0, "LoginName too long - sorry.");
 #ifdef MULTIUSER
   if (multi && strlen(multi) > 20)
Index: screen/screen.h
===================================================================
--- screen.orig/screen.h	2011-10-08 21:20:48.000000000 +0200
+++ screen/screen.h	2011-10-08 21:20:57.000000000 +0200
@@ -207,7 +207,7 @@
       create;
       struct
 	{
-	  char auser[20 + 1];	/* username */
+	  char auser[MAX_USERNAME_LEN + 1];	/* username */
 	  int apid;		/* pid of frontend */
 	  int adaptflag;	/* adapt window size? */
 	  int lines, columns;	/* display size */
@@ -221,13 +221,13 @@
       attach;
       struct 
 	{
-	  char duser[20 + 1];	/* username */
+	  char duser[MAX_USERNAME_LEN + 1];	/* username */
 	  int dpid;		/* pid of frontend */
 	}
       detach;
       struct 
 	{
-	  char auser[20 + 1];	/* username */
+	  char auser[MAX_USERNAME_LEN + 1];	/* username */
 	  int nargs;
 	  char cmd[MAXPATHLEN];	/* command */
 	  int apid;		/* pid of frontend */