Added argument parser and set all logs to STDERR

main.c

@@ -1,6 +1,8 @@
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdint.h>
+#include <string.h>
+#include <stdlib.h>
 
 #include <errno.h>
 #include <signal.h>
@@ -9,6 +11,7 @@
 
 #include "event_loop.h"
 #include "server.h"
+#include "utils.h"
 
 /*
  * Data
@@ -20,6 +23,54 @@ static int _server_fd = -1;
 /*
  * Private API
  */
+// Parse command line arguments and check if mandatory ones are present.
+// Parameters:
+//  - argc
+//  - argv
+// Returns:
+//  - true on success
+//  - false on failure
+bool parse_cli_args(int argc, char** argv) {
+    if (argc < 2) {
+        return false;
+    }
+    int key_length, value_length;
+    int i = 1;
+    char first_sym;
+    while (i < argc) {
+        key_length = strlen(argv[i] + 1);
+        first_sym = argv[i][0];
+        if (key_length != 1 || (first_sym != '+' && first_sym != '-')) {
+            fprintf(stderr, "[!] Argument '%s' is discarded\n", argv[i]);
+            return false;
+        }
+        // flag
+        if (first_sym == '+') {
+            cli_arg_set(argv[i] + 1, argv[i] + 1);
+            i++;
+            continue;
+        }
+        // argument
+        if (i + 1 >= argc) {
+            fprintf(stderr, "[!] Argument '%s' misses a value\n", argv[i]);
+            return false;
+        }
+        value_length = strlen(argv[i + 1]);
+        if (value_length < 1) {
+            fprintf(stderr, "[!] Argument '%s' has empty value\n", argv[i]);
+            return false;
+        }
+        cli_arg_set(argv[i] + 1, argv[i + 1]);
+        i += 2;
+    }
+    bool required_args_present = true;
+    required_args_present &= cli_arg_get("M") ? true : false;
+    required_args_present &= cli_arg_get("A") ? true : false;
+    required_args_present &= cli_arg_get("P") ? true : false;
+    required_args_present &= cli_arg_get("E") ? true : false;
+    return required_args_present;
+}
+
 // Initialize signals.
 // Returns:
 //  - true on success
@@ -32,7 +83,7 @@ static bool signals_init() {
     sigaddset(&mask, SIGINT);
     sigaddset(&mask, SIGQUIT);
     if (sigprocmask(SIG_BLOCK, &mask, NULL) == -1) {
-        printf("[!] sigprocmask failed: %d\n", errno);
+        fprintf(stderr, "[!] sigprocmask failed: %d\n", errno);
         return false;
     }
     _sig_fd = signalfd(
@@ -41,7 +92,7 @@ static bool signals_init() {
         SFD_NONBLOCK
     );
     if (_sig_fd == -1) {
-        printf("[!] signalfd failed: %d\n", errno);
+        fprintf(stderr, "[!] signalfd failed: %d\n", errno);
         return false;
     }
     struct epoll_event ev;
@@ -54,7 +105,7 @@ static bool signals_init() {
     );
     if (!loop_res) {
         close(_sig_fd);
-        printf("[!] loop_ctl failed\n");
+        fprintf(stderr, "[!] loop_ctl failed\n");
         return false;
     }
     return true;
@@ -69,7 +120,7 @@ static void signals_deinit() {
 // Returns:
 //  - true on success
 static bool server_init() {
-    _server_fd = server_open("0.0.0.0", 20070);
+    _server_fd = server_open(cli_arg_get("A"), atoi(cli_arg_get("P")));
     if (_server_fd == -1) {
         return false;
     }
@@ -83,7 +134,7 @@ static bool server_init() {
     );
     if (!loop_res) {
         server_close();
-        printf("[!] loop_ctl failed\n");
+        fprintf(stderr, "[!] loop_ctl failed\n");
         return false;
     }
     return true;
@@ -106,16 +157,20 @@ static void on_fd_event(int fd, uint32_t events) {
     // Server event
     else if (fd == _server_fd) {
         if (!server_event(_server_fd)) {
-            printf("[!] server_event failed\n");
+            fprintf(stderr, "[!] server_event failed\n");
             _to_work = false;
         }
     }
     else {
-        printf("[!] Event has happened on an unknown file descriptor\n");
+        fprintf(stderr, "[!] Event has happened on an unknown file descriptor\n");
     }
 }
 
 int main(int argc, char **argv) {
+    if (!parse_cli_args(argc, argv)) {
+        print_usage_text();
+        return 1;
+    }
     if (!loop_init(on_fd_event)) {
         return 1;
     }
@@ -131,10 +186,10 @@ int main(int argc, char **argv) {
 
     while (_to_work) {
         if (!loop_wait()) {
-            printf("[!] loop_wait returns false, stopping...\n");
+            fprintf(stderr, "[!] loop_wait returns false, stopping...\n");
             break;
         }
-        printf("--- loop ---\n");
+        fprintf(stderr, "--- loop ---\n");
     }
     
     server_close();