- added cat command

newlib/examples/mshell.c

@@ -38,10 +38,11 @@ void showlogo() {
 
 void help() {
 	printf("shell builtin commands: \n");
-	printf("cd <path>:\t change current working directory to path\n");
+	printf("cd <path> :\t change current working directory to path\n");
-	printf("pwd      :\t show current working directory\n");
+	printf("pwd       :\t show current working directory\n");
-	printf("help     :\t this short help\n");
+	printf("cat <path>:\t print files\n");
-	printf("exit     :\t exit the shell \n");
+	printf("help      :\t this short help\n");
+	printf("exit      :\t exit the shell \n");
 }
 
 #define MAXARGS    16
@@ -128,6 +129,27 @@ void ms_setcwd(char* path) {
 	setenv("PWD", newpath, 1);
 }
 
+
+int ms_cat(char* filename)
+{
+	int fd, r = 0;
+	char* buffer = malloc(1024*sizeof(char));
+
+	fd = open(filename, 0, "wr");
+
+	if ((!filename) || (fd < 0))
+		printf("cat: No such file or directory");		
+
+	do {
+		r = read(fd, buffer, 1024);
+		write(1, buffer, r);	
+	} while (r > 0);
+
+	printf("\n");
+	close(fd);
+	return 0;
+}
+
 int main(int argc, char** argv)
 {
 	char  commandline[MAXCMDLINE];
@@ -158,6 +180,8 @@ int main(int argc, char** argv)
 			printf("%s\n", ms_getcwd());
 		} else if (!strcmp(command, "cd")) {
 			ms_setcwd(newargv[1]);
+		} else if (!strcmp(command, "cat")) {
+			ms_cat(newargv[1]);
 		} else {
 			char path[MAXPATH];
 			sprintf(path, "/bin/%s", command);