Step 3 added to the tutorial

Signed-off-by: Martin Sustrik <sustrik@250bpm.com>

.gitignore

@@ -53,3 +53,4 @@ examples/greetserver
 tutorial/.dirstamp
 tutorial/step1
 tutorial/step2
+tutorial/step3

Makefile.am

@@ -109,7 +109,8 @@ noinst_PROGRAMS += \
 
 noinst_PROGRAMS += \
     tutorial/step1 \
-    tutorial/step2
+    tutorial/step2 \
+    tutorial/step3
 
 ################################################################################
 #  additional packaging-related stuff                                          #

tutorial/step2.c

@@ -60,6 +60,3 @@ int main(int argc, char *argv[]) {
     }
 }
 
-
-
-

tutorial/step3.c

@@ -0,0 +1,75 @@
+/*
+
+  Copyright (c) 2015 Martin Sustrik
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"),
+  to deal in the Software without restriction, including without limitation
+  the rights to use, copy, modify, merge, publish, distribute, sublicense,
+  and/or sell copies of the Software, and to permit persons to whom
+  the Software is furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included
+  in all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+  IN THE SOFTWARE.
+
+*/
+
+#include "../libmill.h"
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char *argv[]) {
+
+    int port = 5555;
+    if(argc > 1)
+        port = atoi(argv[1]);
+
+    tcpsock ls = tcplisten(NULL, port);
+    if(!ls) {
+        perror("Can't open listening socket");
+        return 1;
+    }
+
+    while(1) {
+        tcpsock as = tcpaccept(ls, -1);
+        if(!as)
+            continue;
+
+        tcpsend(as, "What's your name?\r\n", 19, -1);
+        if(errno != 0)
+            goto cleanup;
+        tcpflush(as, -1);
+        if(errno != 0)
+            goto cleanup;
+
+        char inbuf[256];
+        size_t sz = tcprecvuntil(as, inbuf, sizeof(inbuf), '\r', -1);
+        if(errno != 0)
+            goto cleanup;
+
+        inbuf[sz - 1] = 0;
+        char outbuf[256];
+        int rc = snprintf(outbuf, sizeof(outbuf), "Hello, %s!\n", inbuf);
+
+        sz = tcpsend(as, outbuf, rc, -1);
+        if(errno != 0)
+            goto cleanup;
+        tcpflush(as, -1);
+        if(errno != 0)
+            goto cleanup;
+
+        cleanup:
+        tcpclose(as);
+    }
+}
+