Update userspace

apps/base/echo/echo.c

@@ -1,15 +1,59 @@
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <getopt.h>
 
 int main(int argc, char *argv[])
 {
-	if (argc == 1)
+	int enableEscapes = 0;
+	int disableNewline = 0;
+
+	int opt;
+	while ((opt = getopt(argc, argv, "neE")) != -1)
 	{
-		printf("Usage: echo [args]\n");
-		return 0;
+		switch (opt)
+		{
+		case 'n':
+			disableNewline = 1;
+			break;
+		case 'e':
+			enableEscapes = 1;
+			break;
+		case 'E':
+			enableEscapes = 0;
+			break;
+		case '?':
+		default:
+			exit(EXIT_FAILURE);
+		}
 	}
 
-	for (int i = 1; i < argc; i++)
-		printf("%s ", argv[i]);
-	printf("\n");
+	(void)enableEscapes;
+
+	size_t totalLength = 0;
+	for (int i = optind; i < argc; ++i)
+		totalLength += strlen(argv[i]) + 1;
+
+	char *result = (char *)malloc(totalLength);
+	if (!result)
+	{
+		perror("Memory allocation error");
+		exit(EXIT_FAILURE);
+	}
+	result[0] = '\0';
+
+	for (int i = optind; i < argc; ++i)
+	{
+		strcat(result, argv[i]);
+		if (i < argc - 1)
+			strcat(result, " ");
+	}
+
+	printf("%s", result);
+
+	if (!disableNewline)
+		printf("\n");
+
+	free(result);
 	return 0;
 }