Makefile

@@ -2,7 +2,7 @@ CC=clang
 CFLAGS=-Wall -Isrc/include -DDEBUG -g -std=c17
 LDFLAGS=
 FILENAME=myshellin
-SRC=src/myshellin.c src/loop.c
+SRC=src/myshellin.c src/loop.c src/user.c
 OBJ=$(SRC:.c=.o)
 
 all: myshellin

src/include/loop.h

@@ -1,2 +1,3 @@
+void remove_new_line(char *line);
 void print_input_line();
 void loop();

src/include/user.h

@@ -0,0 +1 @@
+char *get_user();

src/loop.c

@@ -1,10 +1,18 @@
 #define _GNU_SOURCE
+#include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <sys/types.h>
+#include "user.h"
+
+void remove_new_line(char* line) {
+    line[strcspn(line, "\n")] = 0;
+}
 
 void print_input_line() {
-    printf("$ ");
+    char *name = get_user();
+    printf("%s $ ", name);
 }
 
 void loop() {
@@ -13,6 +21,23 @@ void loop() {
 
     while (1) {
         print_input_line();
-        getline(&line, &buffer_size, stdin);
+        if (getline(&line, &buffer_size, stdin) == -1) {
+            if (feof(stdin)) {
+                // the stdin was closed, this usually happens for CTRL-D
+                printf("\n");
+                exit(EXIT_SUCCESS);
+            }
+            else  {
+                perror("Error: ");
+                printf("\n");
+                exit(EXIT_FAILURE);
+            }
+        }
+
+        remove_new_line(line);
+
+        if (strcmp(line, "quit") == 0) {
+            break;
+        }
     }
 }

src/user.c

@@ -0,0 +1,9 @@
+#include <pwd.h>
+#include <stdio.h>
+#include <unistd.h>
+
+char *get_user() {
+    struct passwd *pass;
+    pass = getpwuid(getuid());
+    return pass->pw_name;
+}