From a46a864eb3927ac58d5d8f18d2ac8cc8ebc04eed Mon Sep 17 00:00:00 2001
From: Assar Westerlund <assar@sics.se>
Date: Sat, 21 Oct 1995 11:53:14 +0000
Subject: [PATCH] Initial revision

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@166 ec53bebd-3082-4978-b11e-865c3cabbd6b
---
 appl/popper/popper.c | 102 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 appl/popper/popper.c

diff --git a/appl/popper/popper.c b/appl/popper/popper.c
new file mode 100644
index 000000000..e4d54e694
--- /dev/null
+++ b/appl/popper/popper.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 1989 Regents of the University of California.
+ * All rights reserved.  The Berkeley software License Agreement
+ * specifies the terms and conditions for redistribution.
+ */
+
+#ifndef lint
+static char copyright[] = "Copyright (c) 1990 Regents of the University of California.\nAll rights reserved.\n";
+static char SccsId[] = "@(#)@(#)popper.c	2.1  2.1 3/18/91";
+#endif not lint
+
+#include <stdio.h>
+#include <sys/types.h>
+#include "popper.h"
+
+extern  state_table *   pop_get_command();
+
+/* 
+ *  popper: Handle a Post Office Protocol version 3 session
+ */
+main (argc, argv)
+int         argc;
+char    **  argv;
+{
+    POP                 p;
+    state_table     *   s;
+    char                message[MAXLINELEN];
+
+    /*  Start things rolling */
+    pop_init(&p,argc,argv);
+
+    /*  Tell the user that we are listenting */
+    pop_msg(&p,POP_SUCCESS,
+        "UCB Pop server (version %s) at %s starting.",VERSION,p.myhost);
+
+    /*  State loop.  The POP server is always in a particular state in 
+        which a specific suite of commands can be executed.  The following 
+        loop reads a line from the client, gets the command, and processes 
+        it in the current context (if allowed) or rejects it.  This continues 
+        until the client quits or an error occurs. */
+
+    for (p.CurrentState=auth1;p.CurrentState!=halt&&p.CurrentState!=error;) {
+
+        /*  Obtain a line from the client */
+        if (fgets(message,MAXLINELEN,p.input) == NULL) {
+            p.CurrentState = error;
+            pop_msg(&p,POP_FAILURE,"POP server at %s signing off.",p.myhost);
+        }
+        else {
+            /*  Search for the command in the command/state table */
+            if ((s = pop_get_command(&p,message)) == NULL) continue;
+
+            /*  Call the function associated with this command in 
+                the current state */
+            if (s->function) p.CurrentState = s->result[(*s->function)(&p)];
+
+            /*  Otherwise assume NOOP and send an OK message to the client */
+            else {
+                p.CurrentState = s->success_state;
+                pop_msg(&p,POP_SUCCESS,NULL);
+            }
+        }       
+    }
+
+    /*  Say goodbye to the client */
+    pop_msg(&p,POP_SUCCESS,"Pop server at %s signing off.",p.myhost);
+
+    /*  Log the end of activity */
+    pop_log(&p,POP_PRIORITY,
+        "(v%s) Ending request from \"%s\" at %s\n",VERSION,p.client,p.ipaddr);
+
+    /*  Stop logging */
+    closelog();
+
+    return(0);
+}
+
+#ifdef STRNCASECMP
+/*
+ *  Perform a case-insensitive string comparision
+ */
+#include <ctype.h>
+strncasecmp(str1,str2,len)
+register char   *   str1;
+register char   *   str2;
+register int        len;
+{
+    register int    i;
+    char            a,
+                    b;
+
+    for (i=len-1;i>=0;i--){
+        a = str1[i];
+        b = str2[i];
+        if (isupper(a)) a = tolower(str1[i]);
+        if (isupper(b)) b = tolower(str2[i]);
+        if (a > b) return (1);
+        if (a < b) return(-1);
+    }
+    return(0);
+}
+#endif STRNCASECMP