Merge remote-tracking branch 'Userspace/master'

Userspace/apps/base/echo/echo.c

@@ -0,0 +1,59 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <getopt.h>
+
+int main(int argc, char *argv[])
+{
+	int enableEscapes = 0;
+	int disableNewline = 0;
+
+	int opt;
+	while ((opt = getopt(argc, argv, "neE")) != -1)
+	{
+		switch (opt)
+		{
+		case 'n':
+			disableNewline = 1;
+			break;
+		case 'e':
+			enableEscapes = 1;
+			break;
+		case 'E':
+			enableEscapes = 0;
+			break;
+		case '?':
+		default:
+			exit(EXIT_FAILURE);
+		}
+	}
+
+	(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;
+}