Fix fg bug

 -Erik

1 files changed, 676 insertions, 670 deletions

diff --git a/lash.c b/lash.c
index 498f437..e143cfe 100644
--- a/lash.c
+++ b/lash.c
@@ -47,46 +47,47 @@
 
 
 enum redirectionType { REDIRECT_INPUT, REDIRECT_OVERWRITE,
-	REDIRECT_APPEND };
+	REDIRECT_APPEND
+};
 
 struct jobSet {
-    struct job *head;		/* head of list of running jobs */
-    struct job *fg;		/* current foreground job */
+	struct job *head;			/* head of list of running jobs */
+	struct job *fg;				/* current foreground job */
 };
 
 struct redirectionSpecifier {
-    enum redirectionType type;	/* type of redirection */
-    int fd;			/* file descriptor being redirected */
-    char *filename;		/* file to redirect fd to */
+	enum redirectionType type;	/* type of redirection */
+	int fd;						/* file descriptor being redirected */
+	char *filename;				/* file to redirect fd to */
 };
 
 struct childProgram {
-    pid_t pid;			/* 0 if exited */
-    char **argv;		/* program name and arguments */
-    int numRedirections;	/* elements in redirection array */
-    struct redirectionSpecifier *redirections;	/* I/O redirections */
-    glob_t globResult;		/* result of parameter globbing */
-    int freeGlob;		/* should we globfree(&globResult)? */
-    int isStopped;		/* is the program currently running? */
+	pid_t pid;					/* 0 if exited */
+	char **argv;				/* program name and arguments */
+	int numRedirections;		/* elements in redirection array */
+	struct redirectionSpecifier *redirections;	/* I/O redirections */
+	glob_t globResult;			/* result of parameter globbing */
+	int freeGlob;				/* should we globfree(&globResult)? */
+	int isStopped;				/* is the program currently running? */
 };
 
 struct job {
-    int jobId;			/* job number */
-    int numProgs;		/* total number of programs in job */
-    int runningProgs;		/* number of programs running */
-    char *text;			/* name of job */
-    char *cmdBuf;		/* buffer various argv's point into */
-    pid_t pgrp;			/* process group ID for the job */
-    struct childProgram *progs;	/* array of programs in job */
-    struct job *next;		/* to track background commands */
-    int stoppedProgs;		/* number of programs alive, but stopped */
+	int jobId;					/* job number */
+	int numProgs;				/* total number of programs in job */
+	int runningProgs;			/* number of programs running */
+	char *text;					/* name of job */
+	char *cmdBuf;				/* buffer various argv's point into */
+	pid_t pgrp;					/* process group ID for the job */
+	struct childProgram *progs;	/* array of programs in job */
+	struct job *next;			/* to track background commands */
+	int stoppedProgs;			/* number of programs alive, but stopped */
 };
 
 struct builtInCommand {
-    char *cmd;			/* name */
-    char *descr;		/* description */
-    char *usage;		/* usage */
-    int (*function) (struct job *, struct jobSet * jobList);	/* function ptr */
+	char *cmd;					/* name */
+	char *descr;				/* description */
+	char *usage;				/* usage */
+	int (*function) (struct job *, struct jobSet * jobList);	/* function ptr */
 };
 
 /* Some function prototypes */
@@ -111,24 +112,26 @@ static int busy_loop(FILE * input);
 
 /* Table of built-in functions */
 static struct builtInCommand bltins[] = {
-    {"bg", "Resume a job in the background", "bg [%%job]", shell_fg_bg},
-    {"cd", "Change working directory", "cd [dir]", shell_cd},
-    //{"echo", "Echo arguments on stdout", "echo arg1 [...]", shell_echo},
-    {"env", "Print all environment variables", "env", shell_env},
-    {"exit", "Exit from shell()", "exit", shell_exit},
-    {"fg", "Bring job into the foreground", "fg [%%job]", shell_fg_bg},
-    {"jobs", "Lists the active jobs", "jobs", shell_jobs},
-    {"pwd", "Print current directory", "pwd", shell_pwd},
-    {"set", "Set environment variable", "set [VAR=value]", shell_set},
-    {"unset", "Unset environment variable", "unset VAR", shell_unset},
-	{".", "Source-in and run commands in a file", ". filename",
-     shell_source},
-    {"help", "List shell built-in commands", "help", shell_help},
-    {NULL, NULL, NULL, NULL}
+	{"bg", "Resume a job in the background", "bg [%%job]", shell_fg_bg},
+	{"cd", "Change working directory", "cd [dir]", shell_cd},
+	//{"echo", "Echo arguments on stdout", "echo arg1 [...]", shell_echo},
+	{"env", "Print all environment variables", "env", shell_env},
+	{"exit", "Exit from shell()", "exit", shell_exit},
+	{"fg", "Bring job into the foreground", "fg [%%job]", shell_fg_bg},
+	{"jobs", "Lists the active jobs", "jobs", shell_jobs},
+	{"pwd", "Print current directory", "pwd", shell_pwd},
+	{"set", "Set environment variable", "set [VAR=value]", shell_set},
+	{"unset", "Unset environment variable", "unset VAR", shell_unset},
+	
+		{".", "Source-in and run commands in a file", ". filename",
+	 shell_source},
+	{"help", "List shell built-in commands", "help", shell_help},
+	{NULL, NULL, NULL, NULL}
 };
 
 static const char shell_usage[] =
-    "sh [FILE]...\n\n" "The BusyBox command interpreter (shell).\n\n";
+
+	"sh [FILE]...\n\n" "The BusyBox command interpreter (shell).\n\n";
 
 
 static char cwd[1024];
@@ -139,323 +142,326 @@ static char *prompt = "# ";
 /* built-in 'cd <path>' handler */
 static int shell_cd(struct job *cmd, struct jobSet *junk)
 {
-    char *newdir;
-    if (!cmd->progs[0].argv[1] == 1)
-	newdir = getenv("HOME");
-    else
-	newdir = cmd->progs[0].argv[1];
-    if (chdir(newdir)) {
-	printf("cd: %s: %s\n", newdir, strerror(errno));
-	return FALSE;
-    }
-    getcwd(cwd, sizeof(cwd));
-
-    return TRUE;
+	char *newdir;
+
+	if (!cmd->progs[0].argv[1] == 1)
+		newdir = getenv("HOME");
+	else
+		newdir = cmd->progs[0].argv[1];
+	if (chdir(newdir)) {
+		printf("cd: %s: %s\n", newdir, strerror(errno));
+		return FALSE;
+	}
+	getcwd(cwd, sizeof(cwd));
+
+	return TRUE;
 }
 
 /* built-in 'env' handler */
 static int shell_env(struct job *dummy, struct jobSet *junk)
 {
-    char **e;
+	char **e;
 
-    for (e = environ; *e; e++) {
-	fprintf(stdout, "%s\n", *e);
-    }
-    return (0);
+	for (e = environ; *e; e++) {
+		fprintf(stdout, "%s\n", *e);
+	}
+	return (0);
 }
 
 /* built-in 'exit' handler */
 static int shell_exit(struct job *cmd, struct jobSet *junk)
 {
-    if (!cmd->progs[0].argv[1] == 1)
-	exit TRUE;
-    else
-	exit(atoi(cmd->progs[0].argv[1]));
+	if (!cmd->progs[0].argv[1] == 1)
+		exit TRUE;
+
+	else
+		exit(atoi(cmd->progs[0].argv[1]));
 }
 
 /* built-in 'fg' and 'bg' handler */
 static int shell_fg_bg(struct job *cmd, struct jobSet *jobList)
 {
-    int i, jobNum;
-    struct job *job;
-
-    if (!jobList->head) {
-	if (!cmd->progs[0].argv[1] || cmd->progs[0].argv[2]) {
-	    fprintf(stderr, "%s: exactly one argument is expected\n",
-		    cmd->progs[0].argv[0]);
-	    return FALSE;
-	}
-	if (sscanf(cmd->progs[0].argv[1], "%%%d", &jobNum) != 1) {
-	    fprintf(stderr, "%s: bad argument '%s'\n",
-		    cmd->progs[0].argv[0], cmd->progs[0].argv[1]);
-	    return FALSE;
+	int i, jobNum;
+	struct job *job;
+
+	if (!jobList->head) {
+		if (!cmd->progs[0].argv[1] || cmd->progs[0].argv[2]) {
+			fprintf(stderr, "%s: exactly one argument is expected\n",
+					cmd->progs[0].argv[0]);
+			return FALSE;
+		}
+		if (sscanf(cmd->progs[0].argv[1], "%%%d", &jobNum) != 1) {
+			fprintf(stderr, "%s: bad argument '%s'\n",
+					cmd->progs[0].argv[0], cmd->progs[0].argv[1]);
+			return FALSE;
+			for (job = jobList->head; job; job = job->next) {
+				if (job->jobId == jobNum) {
+					break;
+				}
+			}
+		}
+	} else {
+		job = jobList->head;
 	}
-    } else {
-	job = jobList->head;
-    }
-
-    for (job = jobList->head; job; job = job->next)
-	if (job->jobId == jobNum)
-	    break;
-
-    if (!job) {
-	fprintf(stderr, "%s: unknown job %d\n",
-		cmd->progs[0].argv[0], jobNum);
-	return FALSE;
-    }
 
-    if (*cmd->progs[0].argv[0] == 'f') {
-	/* Make this job the foreground job */
+	if (!job) {
+		fprintf(stderr, "%s: unknown job %d\n",
+				cmd->progs[0].argv[0], jobNum);
+		return FALSE;
+	}
 
-	if (tcsetpgrp(0, job->pgrp))
-	    perror("tcsetpgrp");
-	jobList->fg = job;
-    }
+	if (*cmd->progs[0].argv[0] == 'f') {
+		/* Make this job the foreground job */
+		if (tcsetpgrp(0, job->pgrp))
+			perror("tcsetpgrp");
+		jobList->fg = job;
+	}
 
-    /* Restart the processes in the job */
-    for (i = 0; i < job->numProgs; i++)
-	job->progs[i].isStopped = 0;
+	/* Restart the processes in the job */
+	for (i = 0; i < job->numProgs; i++)
+		job->progs[i].isStopped = 0;
 
-    kill(-job->pgrp, SIGCONT);
+	kill(-job->pgrp, SIGCONT);
 
-    job->stoppedProgs = 0;
+	job->stoppedProgs = 0;
 
-    return TRUE;
+	return TRUE;
 }
 
 /* built-in 'help' handler */
 static int shell_help(struct job *cmd, struct jobSet *junk)
 {
-    struct builtInCommand *x;
-
-    fprintf(stdout, "\nBuilt-in commands:\n");
-    fprintf(stdout, "-------------------\n");
-    for (x = bltins; x->cmd; x++) {
-	fprintf(stdout, "%s\t%s\n", x->cmd, x->descr);
-    }
-    fprintf(stdout, "\n\n");
-    return TRUE;
+	struct builtInCommand *x;
+
+	fprintf(stdout, "\nBuilt-in commands:\n");
+	fprintf(stdout, "-------------------\n");
+	for (x = bltins; x->cmd; x++) {
+		fprintf(stdout, "%s\t%s\n", x->cmd, x->descr);
+	}
+	fprintf(stdout, "\n\n");
+	return TRUE;
 }
 
 /* built-in 'jobs' handler */
 static int shell_jobs(struct job *dummy, struct jobSet *jobList)
 {
-    struct job *job;
-    char *statusString;
-    for (job = jobList->head; job; job = job->next) {
-	if (job->runningProgs == job->stoppedProgs)
-	    statusString = "Stopped";
-	else
-	    statusString = "Running";
+	struct job *job;
+	char *statusString;
+
+	for (job = jobList->head; job; job = job->next) {
+		if (job->runningProgs == job->stoppedProgs)
+			statusString = "Stopped";
+		else
+			statusString = "Running";
 
-	printf(JOB_STATUS_FORMAT, job->jobId, statusString, job->text);
-    }
-    return TRUE;
+		printf(JOB_STATUS_FORMAT, job->jobId, statusString, job->text);
+	}
+	return TRUE;
 }
 
 
 /* built-in 'pwd' handler */
 static int shell_pwd(struct job *dummy, struct jobSet *junk)
 {
-    getcwd(cwd, sizeof(cwd));
-    fprintf(stdout, "%s\n", cwd);
-    return TRUE;
+	getcwd(cwd, sizeof(cwd));
+	fprintf(stdout, "%s\n", cwd);
+	return TRUE;
 }
 
 /* built-in 'set VAR=value' handler */
 static int shell_set(struct job *cmd, struct jobSet *junk)
 {
-    int res;
-
-    if (!cmd->progs[0].argv[1] == 1) {
-	return (shell_env(cmd, junk));
-    }
-    res = putenv(cmd->progs[0].argv[1]);
-    if (res)
-	fprintf(stdout, "set: %s\n", strerror(errno));
-    return (res);
+	int res;
+
+	if (!cmd->progs[0].argv[1] == 1) {
+		return (shell_env(cmd, junk));
+	}
+	res = putenv(cmd->progs[0].argv[1]);
+	if (res)
+		fprintf(stdout, "set: %s\n", strerror(errno));
+	return (res);
 }
 
 /* Built-in '.' handler (read-in and execute commands from file) */
 static int shell_source(struct job *cmd, struct jobSet *junk)
 {
-    FILE *input;
-    int status;
-
-    if (!cmd->progs[0].argv[1] == 1)
-	return FALSE;
-
-    input = fopen(cmd->progs[0].argv[1], "r");
-    if (!input) {
-	fprintf(stdout, "Couldn't open file '%s'\n",
-		cmd->progs[0].argv[1]);
-	return FALSE;
-    }
-
-    /* Now run the file */
-    status = busy_loop(input);
-    return (status);
+	FILE *input;
+	int status;
+
+	if (!cmd->progs[0].argv[1] == 1)
+		return FALSE;
+
+	input = fopen(cmd->progs[0].argv[1], "r");
+	if (!input) {
+		fprintf(stdout, "Couldn't open file '%s'\n",
+				cmd->progs[0].argv[1]);
+		return FALSE;
+	}
+
+	/* Now run the file */
+	status = busy_loop(input);
+	return (status);
 }
 
 /* built-in 'unset VAR' handler */
 static int shell_unset(struct job *cmd, struct jobSet *junk)
 {
-    if (!cmd->progs[0].argv[1] == 1) {
-	fprintf(stdout, "unset: parameter required.\n");
-	return FALSE;
-    }
-    unsetenv(cmd->progs[0].argv[1]);
-    return TRUE;
+	if (!cmd->progs[0].argv[1] == 1) {
+		fprintf(stdout, "unset: parameter required.\n");
+		return FALSE;
+	}
+	unsetenv(cmd->progs[0].argv[1]);
+	return TRUE;
 }
 
 /* free up all memory from a job */
 static void freeJob(struct job *cmd)
 {
-    int i;
-
-    for (i = 0; i < cmd->numProgs; i++) {
-	free(cmd->progs[i].argv);
-	if (cmd->progs[i].redirections)
-	    free(cmd->progs[i].redirections);
-	if (cmd->progs[i].freeGlob)
-	    globfree(&cmd->progs[i].globResult);
-    }
-    free(cmd->progs);
-    if (cmd->text)
-	free(cmd->text);
-    free(cmd->cmdBuf);
+	int i;
+
+	for (i = 0; i < cmd->numProgs; i++) {
+		free(cmd->progs[i].argv);
+		if (cmd->progs[i].redirections)
+			free(cmd->progs[i].redirections);
+		if (cmd->progs[i].freeGlob)
+			globfree(&cmd->progs[i].globResult);
+	}
+	free(cmd->progs);
+	if (cmd->text)
+		free(cmd->text);
+	free(cmd->cmdBuf);
 }
 
 /* remove a job from the jobList */
 static void removeJob(struct jobSet *jobList, struct job *job)
 {
-    struct job *prevJob;
-
-    freeJob(job);
-    if (job == jobList->head) {
-	jobList->head = job->next;
-    } else {
-	prevJob = jobList->head;
-	while (prevJob->next != job)
-	    prevJob = prevJob->next;
-	prevJob->next = job->next;
-    }
-
-    free(job);
+	struct job *prevJob;
+
+	freeJob(job);
+	if (job == jobList->head) {
+		jobList->head = job->next;
+	} else {
+		prevJob = jobList->head;
+		while (prevJob->next != job)
+			prevJob = prevJob->next;
+		prevJob->next = job->next;
+	}
+
+	free(job);
 }
 
 /* Checks to see if any background processes have exited -- if they 
    have, figure out why and see if a job has completed */
 static void checkJobs(struct jobSet *jobList)
 {
-    struct job *job;
-    pid_t childpid;
-    int status;
-    int progNum = 0;
+	struct job *job;
+	pid_t childpid;
+	int status;
+	int progNum = 0;
+
+	while ((childpid = waitpid(-1, &status, WNOHANG | WUNTRACED)) > 0) {
+		for (job = jobList->head; job; job = job->next) {
+			progNum = 0;
+			while (progNum < job->numProgs &&
+				   job->progs[progNum].pid != childpid) progNum++;
+			if (progNum < job->numProgs)
+				break;
+		}
 
-    while ((childpid = waitpid(-1, &status, WNOHANG | WUNTRACED)) > 0) {
-	for (job = jobList->head; job; job = job->next) {
-	    progNum = 0;
-	    while (progNum < job->numProgs &&
-		   job->progs[progNum].pid != childpid) progNum++;
-	    if (progNum < job->numProgs)
-		break;
-	}
+		if (WIFEXITED(status) || WIFSIGNALED(status)) {
+			/* child exited */
+			job->runningProgs--;
+			job->progs[progNum].pid = 0;
 
-	if (WIFEXITED(status) || WIFSIGNALED(status)) {
-	    /* child exited */
-	    job->runningProgs--;
-	    job->progs[progNum].pid = 0;
+			if (!job->runningProgs) {
+				printf(JOB_STATUS_FORMAT, job->jobId, "Done", job->text);
+				removeJob(jobList, job);
+			}
+		} else {
+			/* child stopped */
+			job->stoppedProgs++;
+			job->progs[progNum].isStopped = 1;
 
-	    if (!job->runningProgs) {
-		printf(JOB_STATUS_FORMAT, job->jobId, "Done", job->text);
-		removeJob(jobList, job);
-	    }
-	} else {
-	    /* child stopped */
-	    job->stoppedProgs++;
-	    job->progs[progNum].isStopped = 1;
-
-	    if (job->stoppedProgs == job->numProgs) {
-		printf(JOB_STATUS_FORMAT, job->jobId, "Stopped",
-		       job->text);
-	    }
+			if (job->stoppedProgs == job->numProgs) {
+				printf(JOB_STATUS_FORMAT, job->jobId, "Stopped",
+					   job->text);
+			}
+		}
 	}
-    }
 
-    if (childpid == -1 && errno != ECHILD)
-	perror("waitpid");
+	if (childpid == -1 && errno != ECHILD)
+		perror("waitpid");
 }
 
 static int getCommand(FILE * source, char *command)
 {
-    if (source == stdin) {
-	fprintf(stdout, "BBSHELL %s %s", cwd, prompt);
-	fflush(stdout);
+	if (source == stdin) {
+		fprintf(stdout, "BBSHELL %s %s", cwd, prompt);
+		fflush(stdout);
 #ifdef BB_FEATURE_SH_COMMAND_EDITING
-	cmdedit_read_input(fileno(stdin), fileno(stdout), command);
-	return 0;
+		cmdedit_read_input(fileno(stdin), fileno(stdout), command);
+		return 0;
 #endif
-    }
+	}
 
-    if (!fgets(command, BUFSIZ - 2, source)) {
-	if (source == stdin)
-	    printf("\n");
-	return 1;
-    }
+	if (!fgets(command, BUFSIZ - 2, source)) {
+		if (source == stdin)
+			printf("\n");
+		return 1;
+	}
 
-    /* remove trailing newline */
-    command[strlen(command) - 1] = '\0';
+	/* remove trailing newline */
+	command[strlen(command) - 1] = '\0';
 
-    return 0;
+	return 0;
 }
 
 static void globLastArgument(struct childProgram *prog, int *argcPtr,
-			     int *argcAllocedPtr)
+							 int *argcAllocedPtr)
 {
-    int argc = *argcPtr;
-    int argcAlloced = *argcAllocedPtr;
-    int rc;
-    int flags;
-    int i;
-    char *src, *dst;
-
-    if (argc > 1) {		/* cmd->globResult is already initialized */
-	flags = GLOB_APPEND;
-	i = prog->globResult.gl_pathc;
-    } else {
-	prog->freeGlob = 1;
-	flags = 0;
-	i = 0;
-    }
-
-    rc = glob(prog->argv[argc - 1], flags, NULL, &prog->globResult);
-    if (rc == GLOB_NOSPACE) {
-	fprintf(stderr, "out of space during glob operation\n");
-	return;
-    } else if (rc == GLOB_NOMATCH ||
-	       (!rc && (prog->globResult.gl_pathc - i) == 1 &&
-		!strcmp(prog->argv[argc - 1],
-			prog->globResult.gl_pathv[i]))) {
-	/* we need to remove whatever \ quoting is still present */
-	src = dst = prog->argv[argc - 1];
-	while (*src) {
-	    if (*src != '\\')
-		*dst++ = *src;
-	    src++;
+	int argc = *argcPtr;
+	int argcAlloced = *argcAllocedPtr;
+	int rc;
+	int flags;
+	int i;
+	char *src, *dst;
+
+	if (argc > 1) {				/* cmd->globResult is already initialized */
+		flags = GLOB_APPEND;
+		i = prog->globResult.gl_pathc;
+	} else {
+		prog->freeGlob = 1;
+		flags = 0;
+		i = 0;
+	}
+
+	rc = glob(prog->argv[argc - 1], flags, NULL, &prog->globResult);
+	if (rc == GLOB_NOSPACE) {
+		fprintf(stderr, "out of space during glob operation\n");
+		return;
+	} else if (rc == GLOB_NOMATCH ||
+			   (!rc && (prog->globResult.gl_pathc - i) == 1 &&
+				!strcmp(prog->argv[argc - 1],
+						prog->globResult.gl_pathv[i]))) {
+		/* we need to remove whatever \ quoting is still present */
+		src = dst = prog->argv[argc - 1];
+		while (*src) {
+			if (*src != '\\')
+				*dst++ = *src;
+			src++;
+		}
+		*dst = '\0';
+	} else if (!rc) {
+		argcAlloced += (prog->globResult.gl_pathc - i);
+		prog->argv =
+			realloc(prog->argv, argcAlloced * sizeof(*prog->argv));
+		memcpy(prog->argv + (argc - 1), prog->globResult.gl_pathv + i,
+			   sizeof(*(prog->argv)) * (prog->globResult.gl_pathc - i));
+		argc += (prog->globResult.gl_pathc - i - 1);
 	}
-	*dst = '\0';
-    } else if (!rc) {
-	argcAlloced += (prog->globResult.gl_pathc - i);
-	prog->argv =
-	    realloc(prog->argv, argcAlloced * sizeof(*prog->argv));
-	memcpy(prog->argv + (argc - 1), prog->globResult.gl_pathv + i,
-	       sizeof(*(prog->argv)) * (prog->globResult.gl_pathc - i));
-	argc += (prog->globResult.gl_pathc - i - 1);
-    }
-
-    *argcAllocedPtr = argcAlloced;
-    *argcPtr = argc;
+
+	*argcAllocedPtr = argcAlloced;
+	*argcPtr = argc;
 }
 
 /* Return cmd->numProgs as 0 if no command is present (e.g. an empty
@@ -465,396 +471,396 @@ static void globLastArgument(struct childProgram *prog, int *argcPtr,
    present. */
 static int parseCommand(char **commandPtr, struct job *job, int *isBg)
 {
-    char *command;
-    char *returnCommand = NULL;
-    char *src, *buf, *chptr;
-    int argc = 0;
-    int done = 0;
-    int argvAlloced;
-    int i;
-    char quote = '\0';
-    int count;
-    struct childProgram *prog;
-
-    /* skip leading white space */
-    while (**commandPtr && isspace(**commandPtr))
-	(*commandPtr)++;
-
-    /* this handles empty lines or leading '#' characters */
-    if (!**commandPtr || (**commandPtr == '#')) {
-	job->numProgs = 0;
-	*commandPtr = NULL;
-	return 0;
-    }
-
-    *isBg = 0;
-    job->numProgs = 1;
-    job->progs = malloc(sizeof(*job->progs));
-
-    /* We set the argv elements to point inside of this string. The 
-       memory is freed by freeJob(). 
-
-       Getting clean memory relieves us of the task of NULL 
-       terminating things and makes the rest of this look a bit 
-       cleaner (though it is, admittedly, a tad less efficient) */
-    job->cmdBuf = command = calloc(1, strlen(*commandPtr) + 1);
-    job->text = NULL;
-
-    prog = job->progs;
-    prog->numRedirections = 0;
-    prog->redirections = NULL;
-    prog->freeGlob = 0;
-    prog->isStopped = 0;
-
-    argvAlloced = 5;
-    prog->argv = malloc(sizeof(*prog->argv) * argvAlloced);
-    prog->argv[0] = job->cmdBuf;
-
-    buf = command;
-    src = *commandPtr;
-    while (*src && !done) {
-	if (quote == *src) {
-	    quote = '\0';
-	} else if (quote) {
-	    if (*src == '\\') {
-		src++;
-		if (!*src) {
-		    fprintf(stderr, "character expected after \\\n");
-		    freeJob(job);
-		    return 1;
-		}
+	char *command;
+	char *returnCommand = NULL;
+	char *src, *buf, *chptr;
+	int argc = 0;
+	int done = 0;
+	int argvAlloced;
+	int i;
+	char quote = '\0';
+	int count;
+	struct childProgram *prog;
+
+	/* skip leading white space */
+	while (**commandPtr && isspace(**commandPtr))
+		(*commandPtr)++;
+
+	/* this handles empty lines or leading '#' characters */
+	if (!**commandPtr || (**commandPtr == '#')) {
+		job->numProgs = 0;
+		*commandPtr = NULL;
+		return 0;
+	}
 
-		/* in shell, "\'" should yield \' */
-		if (*src != quote)
-		    *buf++ = '\\';
-	    } else if (*src == '*' || *src == '?' || *src == '[' ||
-		       *src == ']') *buf++ = '\\';
-	    *buf++ = *src;
-	} else if (isspace(*src)) {
-	    if (*prog->argv[argc]) {
-		buf++, argc++;
-		/* +1 here leaves room for the NULL which ends argv */
-		if ((argc + 1) == argvAlloced) {
-		    argvAlloced += 5;
-		    prog->argv = realloc(prog->argv,
-					 sizeof(*prog->argv) *
-					 argvAlloced);
-		}
-		prog->argv[argc] = buf;
+	*isBg = 0;
+	job->numProgs = 1;
+	job->progs = malloc(sizeof(*job->progs));
+
+	/* We set the argv elements to point inside of this string. The 
+	   memory is freed by freeJob(). 
+
+	   Getting clean memory relieves us of the task of NULL 
+	   terminating things and makes the rest of this look a bit 
+	   cleaner (though it is, admittedly, a tad less efficient) */
+	job->cmdBuf = command = calloc(1, strlen(*commandPtr) + 1);
+	job->text = NULL;
+
+	prog = job->progs;
+	prog->numRedirections = 0;
+	prog->redirections = NULL;
+	prog->freeGlob = 0;
+	prog->isStopped = 0;
+
+	argvAlloced = 5;
+	prog->argv = malloc(sizeof(*prog->argv) * argvAlloced);
+	prog->argv[0] = job->cmdBuf;
+
+	buf = command;
+	src = *commandPtr;
+	while (*src && !done) {
+		if (quote == *src) {
+			quote = '\0';
+		} else if (quote) {
+			if (*src == '\\') {
+				src++;
+				if (!*src) {
+					fprintf(stderr, "character expected after \\\n");
+					freeJob(job);
+					return 1;
+				}
+
+				/* in shell, "\'" should yield \' */
+				if (*src != quote)
+					*buf++ = '\\';
+			} else if (*src == '*' || *src == '?' || *src == '[' ||
+					   *src == ']') *buf++ = '\\';
+			*buf++ = *src;
+		} else if (isspace(*src)) {
+			if (*prog->argv[argc]) {
+				buf++, argc++;
+				/* +1 here leaves room for the NULL which ends argv */
+				if ((argc + 1) == argvAlloced) {
+					argvAlloced += 5;
+					prog->argv = realloc(prog->argv,
+										 sizeof(*prog->argv) *
+										 argvAlloced);
+				}
+				prog->argv[argc] = buf;
+
+				globLastArgument(prog, &argc, &argvAlloced);
+			}
+		} else
+			switch (*src) {
+			case '"':
+			case '\'':
+				quote = *src;
+				break;
+
+			case '#':			/* comment */
+				done = 1;
+				break;
+
+			case '>':			/* redirections */
+			case '<':
+				i = prog->numRedirections++;
+				prog->redirections = realloc(prog->redirections,
+											 sizeof(*prog->redirections) *
+											 (i + 1));
+
+				prog->redirections[i].fd = -1;
+				if (buf != prog->argv[argc]) {
+					/* the stuff before this character may be the file number 
+					   being redirected */
+					prog->redirections[i].fd =
+						strtol(prog->argv[argc], &chptr, 10);
+
+					if (*chptr && *prog->argv[argc]) {
+						buf++, argc++;
+						globLastArgument(prog, &argc, &argvAlloced);
+					}
+				}
+
+				if (prog->redirections[i].fd == -1) {
+					if (*src == '>')
+						prog->redirections[i].fd = 1;
+					else
+						prog->redirections[i].fd = 0;
+				}
+
+				if (*src++ == '>') {
+					if (*src == '>')
+						prog->redirections[i].type =
+							REDIRECT_APPEND, src++;
+					else
+						prog->redirections[i].type = REDIRECT_OVERWRITE;
+				} else {
+					prog->redirections[i].type = REDIRECT_INPUT;
+				}
+
+				/* This isn't POSIX sh compliant. Oh well. */
+				chptr = src;
+				while (isspace(*chptr))
+					chptr++;
+
+				if (!*chptr) {
+					fprintf(stderr, "file name expected after %c\n", *src);
+					freeJob(job);
+					return 1;
+				}
+
+				prog->redirections[i].filename = buf;
+				while (*chptr && !isspace(*chptr))
+					*buf++ = *chptr++;
+
+				src = chptr - 1;	/* we src++ later */
+				prog->argv[argc] = ++buf;
+				break;
+
+			case '|':			/* pipe */
+				/* finish this command */
+				if (*prog->argv[argc])
+					argc++;
+				if (!argc) {
+					fprintf(stderr, "empty command in pipe\n");
+					freeJob(job);
+					return 1;
+				}
+				prog->argv[argc] = NULL;
+
+				/* and start the next */
+				job->numProgs++;
+				job->progs = realloc(job->progs,
+									 sizeof(*job->progs) * job->numProgs);
+				prog = job->progs + (job->numProgs - 1);
+				prog->numRedirections = 0;
+				prog->redirections = NULL;
+				prog->freeGlob = 0;
+				argc = 0;
+
+				argvAlloced = 5;
+				prog->argv = malloc(sizeof(*prog->argv) * argvAlloced);
+				prog->argv[0] = ++buf;
+
+				src++;
+				while (*src && isspace(*src))
+					src++;
+
+				if (!*src) {
+					fprintf(stderr, "empty command in pipe\n");
+					return 1;
+				}
+				src--;			/* we'll ++ it at the end of the loop */
+
+				break;
+
+			case '&':			/* background */
+				*isBg = 1;
+			case ';':			/* multiple commands */
+				done = 1;
+				returnCommand = *commandPtr + (src - *commandPtr) + 1;
+				break;
 
+			case '\\':
+				src++;
+				if (!*src) {
+					freeJob(job);
+					fprintf(stderr, "character expected after \\\n");
+					return 1;
+				}
+				if (*src == '*' || *src == '[' || *src == ']'
+					|| *src == '?') *buf++ = '\\';
+				/* fallthrough */
+			default:
+				*buf++ = *src;
+			}
+
+		src++;
+	}
+
+	if (*prog->argv[argc]) {
+		argc++;
 		globLastArgument(prog, &argc, &argvAlloced);
-	    }
-	} else
-	    switch (*src) {
-	    case '"':
-	    case '\'':
-		quote = *src;
-		break;
-
-	    case '#':		/* comment */
-		done = 1;
-		break;
-
-	    case '>':		/* redirections */
-	    case '<':
-		i = prog->numRedirections++;
-		prog->redirections = realloc(prog->redirections,
-					     sizeof(*prog->redirections) *
-					     (i + 1));
-
-		prog->redirections[i].fd = -1;
-		if (buf != prog->argv[argc]) {
-		    /* the stuff before this character may be the file number 
-		       being redirected */
-		    prog->redirections[i].fd =
-			strtol(prog->argv[argc], &chptr, 10);
-
-		    if (*chptr && *prog->argv[argc]) {
-			buf++, argc++;
-			globLastArgument(prog, &argc, &argvAlloced);
-		    }
-		}
+	}
+	if (!argc) {
+		freeJob(job);
+		return 0;
+	}
+	prog->argv[argc] = NULL;
 
-		if (prog->redirections[i].fd == -1) {
-		    if (*src == '>')
-			prog->redirections[i].fd = 1;
-		    else
-			prog->redirections[i].fd = 0;
-		}
+	if (!returnCommand) {
+		job->text = malloc(strlen(*commandPtr) + 1);
+		strcpy(job->text, *commandPtr);
+	} else {
+		/* This leaves any trailing spaces, which is a bit sloppy */
 
-		if (*src++ == '>') {
-		    if (*src == '>')
-			prog->redirections[i].type =
-			    REDIRECT_APPEND, src++;
-		    else
-			prog->redirections[i].type = REDIRECT_OVERWRITE;
-		} else {
-		    prog->redirections[i].type = REDIRECT_INPUT;
-		}
+		count = returnCommand - *commandPtr;
+		job->text = malloc(count + 1);
+		strncpy(job->text, *commandPtr, count);
+		job->text[count] = '\0';
+	}
+
+	*commandPtr = returnCommand;
 
-		/* This isn't POSIX sh compliant. Oh well. */
-		chptr = src;
-		while (isspace(*chptr))
-		    chptr++;
+	return 0;
+}
 
-		if (!*chptr) {
-		    fprintf(stderr, "file name expected after %c\n", *src);
-		    freeJob(job);
-		    return 1;
+static int runCommand(struct job newJob, struct jobSet *jobList, int inBg)
+{
+	struct job *job;
+	int i;
+	int nextin, nextout;
+	int pipefds[2];				/* pipefd[0] is for reading */
+	struct builtInCommand *x;
+
+	/* handle built-ins here -- we don't fork() so we can't background
+	   these very easily */
+	for (x = bltins; x->cmd; x++) {
+		if (!strcmp(newJob.progs[0].argv[0], x->cmd)) {
+			return (x->function(&newJob, jobList));
 		}
+	}
 
-		prog->redirections[i].filename = buf;
-		while (*chptr && !isspace(*chptr))
-		    *buf++ = *chptr++;
-
-		src = chptr - 1;	/* we src++ later */
-		prog->argv[argc] = ++buf;
-		break;
-
-	    case '|':		/* pipe */
-		/* finish this command */
-		if (*prog->argv[argc])
-		    argc++;
-		if (!argc) {
-		    fprintf(stderr, "empty command in pipe\n");
-		    freeJob(job);
-		    return 1;
+	nextin = 0, nextout = 1;
+	for (i = 0; i < newJob.numProgs; i++) {
+		if ((i + 1) < newJob.numProgs) {
+			pipe(pipefds);
+			nextout = pipefds[1];
+		} else {
+			nextout = 1;
 		}
-		prog->argv[argc] = NULL;
-
-		/* and start the next */
-		job->numProgs++;
-		job->progs = realloc(job->progs,
-				     sizeof(*job->progs) * job->numProgs);
-		prog = job->progs + (job->numProgs - 1);
-		prog->numRedirections = 0;
-		prog->redirections = NULL;
-		prog->freeGlob = 0;
-		argc = 0;
-
-		argvAlloced = 5;
-		prog->argv = malloc(sizeof(*prog->argv) * argvAlloced);
-		prog->argv[0] = ++buf;
 
-		src++;
-		while (*src && isspace(*src))
-		    src++;
+		if (!(newJob.progs[i].pid = fork())) {
+			signal(SIGTTOU, SIG_DFL);
 
-		if (!*src) {
-		    fprintf(stderr, "empty command in pipe\n");
-		    return 1;
-		}
-		src--;		/* we'll ++ it at the end of the loop */
+			if (nextin != 0) {
+				dup2(nextin, 0);
+				close(nextin);
+			}
 
-		break;
+			if (nextout != 1) {
+				dup2(nextout, 1);
+				close(nextout);
+			}
 
-	    case '&':		/* background */
-		*isBg = 1;
-	    case ';':		/* multiple commands */
-		done = 1;
-		returnCommand = *commandPtr + (src - *commandPtr) + 1;
-		break;
+			/* explicit redirections override pipes */
+			setupRedirections(newJob.progs + i);
 
-	    case '\\':
-		src++;
-		if (!*src) {
-		    freeJob(job);
-		    fprintf(stderr, "character expected after \\\n");
-		    return 1;
+			execvp(newJob.progs[i].argv[0], newJob.progs[i].argv);
+			fatalError("sh: %s: %s\n", newJob.progs[i].argv[0],
+					   strerror(errno));
 		}
-		if (*src == '*' || *src == '[' || *src == ']'
-		    || *src == '?') *buf++ = '\\';
-		/* fallthrough */
-	    default:
-		*buf++ = *src;
-	    }
-
-	src++;
-    }
-
-    if (*prog->argv[argc]) {
-	argc++;
-	globLastArgument(prog, &argc, &argvAlloced);
-    }
-    if (!argc) {
-	freeJob(job);
-	return 0;
-    }
-    prog->argv[argc] = NULL;
 
-    if (!returnCommand) {
-	job->text = malloc(strlen(*commandPtr) + 1);
-	strcpy(job->text, *commandPtr);
-    } else {
-	/* This leaves any trailing spaces, which is a bit sloppy */
+		/* put our child in the process group whose leader is the
+		   first process in this pipe */
+		setpgid(newJob.progs[i].pid, newJob.progs[0].pid);
 
-	count = returnCommand - *commandPtr;
-	job->text = malloc(count + 1);
-	strncpy(job->text, *commandPtr, count);
-	job->text[count] = '\0';
-    }
+		if (nextin != 0)
+			close(nextin);
+		if (nextout != 1)
+			close(nextout);
 
-    *commandPtr = returnCommand;
+		/* If there isn't another process, nextin is garbage 
+		   but it doesn't matter */
+		nextin = pipefds[0];
+	}
 
-    return 0;
-}
+	newJob.pgrp = newJob.progs[0].pid;
 
-static int runCommand(struct job newJob, struct jobSet *jobList, int inBg)
-{
-    struct job *job;
-    int i;
-    int nextin, nextout;
-    int pipefds[2];		/* pipefd[0] is for reading */
-    struct builtInCommand *x;
-
-    /* handle built-ins here -- we don't fork() so we can't background
-       these very easily */
-    for (x = bltins; x->cmd; x++) {
-	if (!strcmp(newJob.progs[0].argv[0], x->cmd)) {
-	    return (x->function(&newJob, jobList));
-	}
-    }
+	/* find the ID for the job to use */
+	newJob.jobId = 1;
+	for (job = jobList->head; job; job = job->next)
+		if (job->jobId >= newJob.jobId)
+			newJob.jobId = job->jobId + 1;
 
-    nextin = 0, nextout = 1;
-    for (i = 0; i < newJob.numProgs; i++) {
-	if ((i + 1) < newJob.numProgs) {
-	    pipe(pipefds);
-	    nextout = pipefds[1];
+	/* add the job to the list of running jobs */
+	if (!jobList->head) {
+		job = jobList->head = malloc(sizeof(*job));
 	} else {
-	    nextout = 1;
+		for (job = jobList->head; job->next; job = job->next);
+		job->next = malloc(sizeof(*job));
+		job = job->next;
 	}
 
-	if (!(newJob.progs[i].pid = fork())) {
-	    signal(SIGTTOU, SIG_DFL);
+	*job = newJob;
+	job->next = NULL;
+	job->runningProgs = job->numProgs;
+	job->stoppedProgs = 0;
 
-	    if (nextin != 0) {
-		dup2(nextin, 0);
-		close(nextin);
-	    }
+	if (inBg) {
+		/* we don't wait for background jobs to return -- append it 
+		   to the list of backgrounded jobs and leave it alone */
 
-	    if (nextout != 1) {
-		dup2(nextout, 1);
-		close(nextout);
-	    }
+		printf("[%d] %d\n", job->jobId,
+			   newJob.progs[newJob.numProgs - 1].pid);
+	} else {
+		jobList->fg = job;
 
-	    /* explicit redirections override pipes */
-	    setupRedirections(newJob.progs + i);
+		/* move the new process group into the foreground */
 
-	    execvp(newJob.progs[i].argv[0], newJob.progs[i].argv);
-	    fatalError("sh: %s: %s\n", newJob.progs[i].argv[0],
-		       strerror(errno));
+		if (tcsetpgrp(0, newJob.pgrp))
+			perror("tcsetpgrp");
 	}
 
-	/* put our child in the process group whose leader is the
-	   first process in this pipe */
-	setpgid(newJob.progs[i].pid, newJob.progs[0].pid);
-
-	if (nextin != 0)
-	    close(nextin);
-	if (nextout != 1)
-	    close(nextout);
-
-	/* If there isn't another process, nextin is garbage 
-	   but it doesn't matter */
-	nextin = pipefds[0];
-    }
-
-    newJob.pgrp = newJob.progs[0].pid;
-
-    /* find the ID for the job to use */
-    newJob.jobId = 1;
-    for (job = jobList->head; job; job = job->next)
-	if (job->jobId >= newJob.jobId)
-	    newJob.jobId = job->jobId + 1;
-
-    /* add the job to the list of running jobs */
-    if (!jobList->head) {
-	job = jobList->head = malloc(sizeof(*job));
-    } else {
-	for (job = jobList->head; job->next; job = job->next);
-	job->next = malloc(sizeof(*job));
-	job = job->next;
-    }
-
-    *job = newJob;
-    job->next = NULL;
-    job->runningProgs = job->numProgs;
-    job->stoppedProgs = 0;
-
-    if (inBg) {
-	/* we don't wait for background jobs to return -- append it 
-	   to the list of backgrounded jobs and leave it alone */
-
-	printf("[%d] %d\n", job->jobId,
-	       newJob.progs[newJob.numProgs - 1].pid);
-    } else {
-	jobList->fg = job;
-
-	/* move the new process group into the foreground */
-
-	if (tcsetpgrp(0, newJob.pgrp))
-	    perror("tcsetpgrp");
-    }
-
-    return 0;
+	return 0;
 }
 
 static int setupRedirections(struct childProgram *prog)
 {
-    int i;
-    int openfd;
-    int mode = O_RDONLY;
-    struct redirectionSpecifier *redir = prog->redirections;
-
-    for (i = 0; i < prog->numRedirections; i++, redir++) {
-	switch (redir->type) {
-	case REDIRECT_INPUT:
-	    mode = O_RDONLY;
-	    break;
-	case REDIRECT_OVERWRITE:
-	    mode = O_RDWR | O_CREAT | O_TRUNC;
-	    break;
-	case REDIRECT_APPEND:
-	    mode = O_RDWR | O_CREAT | O_APPEND;
-	    break;
-	}
+	int i;
+	int openfd;
+	int mode = O_RDONLY;
+	struct redirectionSpecifier *redir = prog->redirections;
+
+	for (i = 0; i < prog->numRedirections; i++, redir++) {
+		switch (redir->type) {
+		case REDIRECT_INPUT:
+			mode = O_RDONLY;
+			break;
+		case REDIRECT_OVERWRITE:
+			mode = O_RDWR | O_CREAT | O_TRUNC;
+			break;
+		case REDIRECT_APPEND:
+			mode = O_RDWR | O_CREAT | O_APPEND;
+			break;
+		}
 
-	openfd = open(redir->filename, mode, 0666);
-	if (openfd < 0) {
-	    /* this could get lost if stderr has been redirected, but
-	       bash and ash both lose it as well (though zsh doesn't!) */
-	    fprintf(stderr, "error opening %s: %s\n", redir->filename,
-		    strerror(errno));
-	    return 1;
-	}
+		openfd = open(redir->filename, mode, 0666);
+		if (openfd < 0) {
+			/* this could get lost if stderr has been redirected, but
+			   bash and ash both lose it as well (though zsh doesn't!) */
+			fprintf(stderr, "error opening %s: %s\n", redir->filename,
+					strerror(errno));
+			return 1;
+		}
 
-	if (openfd != redir->fd) {
-	    dup2(openfd, redir->fd);
-	    close(openfd);
+		if (openfd != redir->fd) {
+			dup2(openfd, redir->fd);
+			close(openfd);
+		}
 	}
-    }
 
-    return 0;
+	return 0;
 }
 
 
 static int busy_loop(FILE * input)
 {
-    char *command;
-    char *nextCommand = NULL;
-    struct jobSet jobList = { NULL, NULL };
-    struct job newJob;
-    int i;
-    int status;
-    int inBg;
+	char *command;
+	char *nextCommand = NULL;
+	struct jobSet jobList = { NULL, NULL };
+	struct job newJob;
+	int i;
+	int status;
+	int inBg;
 
-    command = (char*) calloc(BUFSIZ, sizeof(char));
+	command = (char *) calloc(BUFSIZ, sizeof(char));
 
-    /* don't pay any attention to this signal; it just confuses 
-       things and isn't really meant for shells anyway */
-    signal(SIGTTOU, SIG_IGN);
+	/* don't pay any attention to this signal; it just confuses 
+	   things and isn't really meant for shells anyway */
+	signal(SIGTTOU, SIG_IGN);
 
-    while (1) {
+	while (1) {
 		if (!jobList.fg) {
 			/* no job is in the foreground */
 
@@ -862,97 +868,97 @@ static int busy_loop(FILE * input)
 			checkJobs(&jobList);
 
 			if (!nextCommand) {
-			if (getCommand(input, command))
-				break;
-			nextCommand = command;
+				if (getCommand(input, command))
+					break;
+				nextCommand = command;
 			}
 
 			if (!parseCommand(&nextCommand, &newJob, &inBg) &&
-			newJob.numProgs) {
-			runCommand(newJob, &jobList, inBg);
+				newJob.numProgs) {
+				runCommand(newJob, &jobList, inBg);
 			}
 		} else {
 			/* a job is running in the foreground; wait for it */
 			i = 0;
 			while (!jobList.fg->progs[i].pid ||
-			   jobList.fg->progs[i].isStopped) i++;
+				   jobList.fg->progs[i].isStopped) i++;
 
 			waitpid(jobList.fg->progs[i].pid, &status, WUNTRACED);
 
 			if (WIFEXITED(status) || WIFSIGNALED(status)) {
-			/* the child exited */
-			jobList.fg->runningProgs--;
-			jobList.fg->progs[i].pid = 0;
+				/* the child exited */
+				jobList.fg->runningProgs--;
+				jobList.fg->progs[i].pid = 0;
 
-			if (!jobList.fg->runningProgs) {
-				/* child exited */
+				if (!jobList.fg->runningProgs) {
+					/* child exited */
 
-				removeJob(&jobList, jobList.fg);
-				jobList.fg = NULL;
+					removeJob(&jobList, jobList.fg);
+					jobList.fg = NULL;
 
-				/* move the shell to the foreground */
-				if (tcsetpgrp(0, getpid()))
-				perror("tcsetpgrp");
-			}
+					/* move the shell to the foreground */
+					if (tcsetpgrp(0, getpid()))
+						perror("tcsetpgrp");
+				}
 			} else {
-			/* the child was stopped */
-			jobList.fg->stoppedProgs++;
-			jobList.fg->progs[i].isStopped = 1;
-
-			if (jobList.fg->stoppedProgs == jobList.fg->runningProgs) {
-				printf("\n" JOB_STATUS_FORMAT, jobList.fg->jobId,
-				   "Stopped", jobList.fg->text);
-				jobList.fg = NULL;
-			}
+				/* the child was stopped */
+				jobList.fg->stoppedProgs++;
+				jobList.fg->progs[i].isStopped = 1;
+
+				if (jobList.fg->stoppedProgs == jobList.fg->runningProgs) {
+					printf("\n" JOB_STATUS_FORMAT, jobList.fg->jobId,
+						   "Stopped", jobList.fg->text);
+					jobList.fg = NULL;
+				}
 			}
 
 			if (!jobList.fg) {
-			/* move the shell to the foreground */
-			if (tcsetpgrp(0, getpid()))
-				perror("tcsetpgrp");
+				/* move the shell to the foreground */
+				if (tcsetpgrp(0, getpid()))
+					perror("tcsetpgrp");
 			}
 		}
 	}
-	free( command);
+	free(command);
 
-    return 0;
+	return 0;
 }
 
 
 int shell_main(int argc, char **argv)
 {
-    FILE *input = stdin;
-
-    if (argc > 2) {
-	usage(shell_usage);
-    }
-    /* initialize the cwd */
-    getcwd(cwd, sizeof(cwd));
-
-
-    //if (argv[0] && argv[0][0] == '-') {
-    //      shell_source("/etc/profile");
-    //}
-
-    if (argc < 2) {
-	fprintf(stdout, "\n\nBusyBox v%s (%s) Built-in shell\n", BB_VER,
-		BB_BT);
-	fprintf(stdout,
-		"Enter 'help' for a list of built-in commands.\n\n");
-    } else {
-	input = fopen(argv[1], "r");
-	if (!input)
-	    fatalError("A: Couldn't open file '%s': %s\n", argv[1],
-		       strerror(errno));
+	FILE *input = stdin;
+
+	if (argc > 2) {
+		usage(shell_usage);
+	}
+	/* initialize the cwd */
+	getcwd(cwd, sizeof(cwd));
+
+
+	//if (argv[0] && argv[0][0] == '-') {
+	//      shell_source("/etc/profile");
+	//}
+
+	if (argc < 2) {
+		fprintf(stdout, "\n\nBusyBox v%s (%s) Built-in shell\n", BB_VER,
+				BB_BT);
+		fprintf(stdout,
+				"Enter 'help' for a list of built-in commands.\n\n");
+	} else {
+		input = fopen(argv[1], "r");
+		if (!input)
+			fatalError("A: Couldn't open file '%s': %s\n", argv[1],
+					   strerror(errno));
 //              else
 //                      fatalError("Got it.\n");
-	//exit(shell_source(argv[1]));
+		//exit(shell_source(argv[1]));
 
-	/* Set terminal IO to canonical mode, and save old term settings. */
+		/* Set terminal IO to canonical mode, and save old term settings. */
 #ifdef BB_FEATURE_SH_COMMAND_EDITING
-	cmdedit_init();
+		cmdedit_init();
 #endif
-    }
+	}
 
-    return (busy_loop(input));
+	return (busy_loop(input));
 }