Add man page:

- Add man1/stc.1
    - Add target in Makefile
    - install target installs man page
    - uninstall target uninstalls man page
    - Reduce number of exit code

Makefile

@@ -4,10 +4,11 @@ LDFLAGS  = -Wl,-z,now,-z,relro,-s,-pie
 
 OBJS = obj/main.o
 BIN  = bin/stc
+MAN  = man1/stc.1.gz
 
 PREFIX = /usr
 
-default: obj bin $(BIN)
+default: obj bin $(BIN) $(MAN)
 
 obj:
 	@mkdir obj
@@ -21,17 +22,25 @@ $(BIN): $(OBJS)
 obj/%.o: src/%.c
 	$(CC) -c -o $@ $^ $(CFLAGS)
 
+man1/%.1.gz: man1/%.1
+	gzip --keep --best -c $^ > $@
+
 clean:
 	@[ -d obj ] && rm -rf obj
 	@[ -d bin ] && rm -rf bin
+	@[ -f $(MAN) ] && rm -f $(MAN)
 
 format:
 	@clang-format -i -style="{BasedOnStyle: mozilla, IndentWidth: 4}" src/*.c
 
 install: default
 	install -Dm755 $(BIN) $(PREFIX)/bin/stc
+	install -Dm644 LICENSE $(PREFIX)/share/licenses/stc/LICENSE
+	install -Dm644 man1/stc.1.gz $(PREFIX)/share//man/man1/stc.1.gz
 
 uninstall:
 	rm -f $(PREFIX)/bin/stc
+	rm -f $(PREFIX)/share/licenses/stc/LICENSE
+	rm -f $(PREFIX)/share/man/man1/stc.1.gz
 
 .PHONY: default clean format install uninstall

README.md

@@ -25,5 +25,5 @@ sudo make uninstall
 ## Usage
 
 ```
-stc address|hostname [port]
+stc address|domainname [port]
 ```

man1/stc.1

@@ -0,0 +1,45 @@
+.TH STC 1 "2020-09-02" 1.0
+.SH NAME
+stc \- Simple Telnet Client
+.SH SYNOPSIS
+.B stc
+address|hostname [port]
+.SH DESCRIPTION
+.B stc
+is a Simple Telnet Client that take at least an IP address or a domain name as a first argument. If a domain name is provided, it will try to resolve it.
+Optionnaly it can take a port number as a second argument. In this case it will be used instead of the default (which is 23).
+.SH EXIT STATUS
+.TP
+0
+if no error uncountered
+.TP
+1
+if the wrong amount of arguments has been given
+.TP
+2
+if it failed to initialize network connection (socket, NS resolution, ...)
+.TP
+3
+if it failed to setup terminal
+.TP
+4
+if it failed to create epoll instance
+.TP
+5
+if it failed to set signal handler (for SIGINT or SIGTERM)
+.TP
+6
+if it failed to add a file descriptor to the epoll instance (for stdin or the socket)
+.TP
+7
+if error happened during epoll_wait
+.TP
+8
+if it failed to receive data
+.TP
+9
+if it failed to send data
+.SH AUTHOR
+Franck STAUFFER
+.I <franck.stauffer@monaco.mc>
+

src/main.c

@@ -135,7 +135,7 @@ int
 main(int argc, char** argv)
 {
     if (argc < 2 || argc > 3) {
-        printf("USAGE: %s, address|hostname [port]\n", argv[0]);
+        printf("USAGE: %s, address|domainname [port]\n", argv[0]);
         return 1;
     }
 
@@ -176,7 +176,7 @@ main(int argc, char** argv)
     ev[1].data.fd = sock;
     if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, sock, &ev[1])) {
         perror("epoll_ctl");
-        return 7;
+        return 6;
     }
 
     uint_fast8_t run = 1;
@@ -186,7 +186,7 @@ main(int argc, char** argv)
         int_fast8_t count = epoll_wait(epoll_fd, events, 2, -1);
         if (count == -1) {
             perror("epoll_wait");
-            return 8;
+            return 7;
         }
 
         for (int_fast8_t i = 0; i < count; ++i) {
@@ -196,7 +196,7 @@ main(int argc, char** argv)
                 int_fast8_t ret = recv(sock, buf, 1, 0);
                 if (ret == -1) {
                     perror("recv");
-                    return 9;
+                    return 8;
                 }
 
                 if (!ret)
@@ -206,7 +206,7 @@ main(int argc, char** argv)
                     ret = recv(sock, buf + 1, 2, 0);
                     if (ret < 0) {
                         perror("recv");
-                        return 10;
+                        return 8;
                     }
 
                     if (!ret)
@@ -226,7 +226,7 @@ main(int argc, char** argv)
 
                 if (send(sock, &chr, 1, 0) != 1) {
                     perror("send");
-                    return 11;
+                    return 9;
                 }
 
                 if (chr == '\n')