Task 6

Code/main.c

@@ -0,0 +1,86 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "utils/userinput.h"
+#include "utils/history.h"
+#include "utils/commands.h"
+
+char original_path[1024];
+
+/** @brief Setup the initial values for the shell */
+void setupShell(void) {
+    char *path = getenv("PATH");
+
+    if(path != NULL) {
+        strcpy(original_path, path);
+    }
+
+    char *home = getenv("HOME");
+
+    if(home != NULL) {
+        if(chdir(home) != 0) {
+            printf("Error: Could not change to HOME directory\n");
+        }
+    }
+
+    char cwd[1024];
+
+    if(getcwd(cwd, sizeof(cwd)) != NULL) {
+        printf("Current working directory: %s\n", cwd);
+    }
+
+    // TASK 6 GOES HERE
+    // Read saved history from file
+    // History is loaded using getCommandHistory() in main    
+}
+
+// MAIN LOOP
+
+/** @brief Display the shell prompt & process user input */
+int main(void) {
+    // Set PATH initially
+    setupShell();
+
+    // Get command history
+    history = getCommandHistory(); // Makes use of history global variable
+
+    char input[1024];
+    char *tokens[512];
+
+    while(1) {
+        // Print prompt
+        printf("> ");
+
+        // Get & check user input for NULL
+        if(fgets(input, sizeof(input), stdin) == NULL) {
+            break; // EOF (Ctrl + D OR Ctrl + D)
+        }
+
+        // Input validation
+        if(strlen(input) > 512 || input[0] == '\n') {
+            printf("Error occurred with the input\n");
+            break;
+        }
+
+        // Duplicate input as tokenizeInput irreversibly changes input when used
+        char *dupe_input = malloc(strlen(input) + 1);
+        strcpy(dupe_input, input); 
+
+        // Tokenize input String into tokens
+        tokenizeInput(input, tokens);
+
+        // Check for NULL command name
+        if(tokens[0] == NULL) {
+            printf("Command is NULL");
+            break;
+        }
+
+        // Check the tokens against known commands
+        checkForCommands(tokens, history, dupe_input);
+        free(dupe_input); // Free duplicated input upon completion
+    }
+
+    return 0;
+}