Rename hush to cli_hush

Hush is a command-line interpreter, so rename it to make that clearer.

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 3687 insertions, 0 deletions

diff --git a/common/cli_hush.c b/common/cli_hush.c
new file mode 100644
index 0000000..012004a
--- /dev/null
+++ b/common/cli_hush.c
@@ -0,0 +1,3687 @@
+/*
+ * sh.c -- a prototype Bourne shell grammar parser
+ *      Intended to follow the original Thompson and Ritchie
+ *      "small and simple is beautiful" philosophy, which
+ *      incidentally is a good match to today's BusyBox.
+ *
+ * Copyright (C) 2000,2001  Larry Doolittle  <larry@doolittle.boa.org>
+ *
+ * Credits:
+ *      The parser routines proper are all original material, first
+ *      written Dec 2000 and Jan 2001 by Larry Doolittle.
+ *      The execution engine, the builtins, and much of the underlying
+ *      support has been adapted from busybox-0.49pre's lash,
+ *      which is Copyright (C) 2000 by Lineo, Inc., and
+ *      written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>.
+ *      That, in turn, is based in part on ladsh.c, by Michael K. Johnson and
+ *      Erik W. Troan, which they placed in the public domain.  I don't know
+ *      how much of the Johnson/Troan code has survived the repeated rewrites.
+ * Other credits:
+ *      b_addchr() derived from similar w_addchar function in glibc-2.2
+ *      setup_redirect(), redirect_opt_num(), and big chunks of main()
+ *        and many builtins derived from contributions by Erik Andersen
+ *      miscellaneous bugfixes from Matt Kraai
+ *
+ * There are two big (and related) architecture differences between
+ * this parser and the lash parser.  One is that this version is
+ * actually designed from the ground up to understand nearly all
+ * of the Bourne grammar.  The second, consequential change is that
+ * the parser and input reader have been turned inside out.  Now,
+ * the parser is in control, and asks for input as needed.  The old
+ * way had the input reader in control, and it asked for parsing to
+ * take place as needed.  The new way makes it much easier to properly
+ * handle the recursion implicit in the various substitutions, especially
+ * across continuation lines.
+ *
+ * Bash grammar not implemented: (how many of these were in original sh?)
+ *      $@ (those sure look like weird quoting rules)
+ *      $_
+ *      ! negation operator for pipes
+ *      &> and >& redirection of stdout+stderr
+ *      Brace Expansion
+ *      Tilde Expansion
+ *      fancy forms of Parameter Expansion
+ *      aliases
+ *      Arithmetic Expansion
+ *      <(list) and >(list) Process Substitution
+ *      reserved words: case, esac, select, function
+ *      Here Documents ( << word )
+ *      Functions
+ * Major bugs:
+ *      job handling woefully incomplete and buggy
+ *      reserved word execution woefully incomplete and buggy
+ * to-do:
+ *      port selected bugfixes from post-0.49 busybox lash - done?
+ *      finish implementing reserved words: for, while, until, do, done
+ *      change { and } from special chars to reserved words
+ *      builtins: break, continue, eval, return, set, trap, ulimit
+ *      test magic exec
+ *      handle children going into background
+ *      clean up recognition of null pipes
+ *      check setting of global_argc and global_argv
+ *      control-C handling, probably with longjmp
+ *      follow IFS rules more precisely, including update semantics
+ *      figure out what to do with backslash-newline
+ *      explain why we use signal instead of sigaction
+ *      propagate syntax errors, die on resource errors?
+ *      continuation lines, both explicit and implicit - done?
+ *      memory leak finding and plugging - done?
+ *      more testing, especially quoting rules and redirection
+ *      document how quoting rules not precisely followed for variable assignments
+ *      maybe change map[] to use 2-bit entries
+ *      (eventually) remove all the printf's
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#define __U_BOOT__
+#ifdef __U_BOOT__
+#include <malloc.h>         /* malloc, free, realloc*/
+#include <linux/ctype.h>    /* isalpha, isdigit */
+#include <common.h>        /* readline */
+#include <cli_hush.h>
+#include <command.h>        /* find_cmd */
+#ifndef CONFIG_SYS_PROMPT_HUSH_PS2
+#define CONFIG_SYS_PROMPT_HUSH_PS2	"> "
+#endif
+#endif
+#ifndef __U_BOOT__
+#include <ctype.h>     /* isalpha, isdigit */
+#include <unistd.h>    /* getpid */
+#include <stdlib.h>    /* getenv, atoi */
+#include <string.h>    /* strchr */
+#include <stdio.h>     /* popen etc. */
+#include <glob.h>      /* glob, of course */
+#include <stdarg.h>    /* va_list */
+#include <errno.h>
+#include <fcntl.h>
+#include <getopt.h>    /* should be pretty obvious */
+
+#include <sys/stat.h>  /* ulimit */
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <signal.h>
+
+/* #include <dmalloc.h> */
+
+#if 1
+#include "busybox.h"
+#include "cmdedit.h"
+#else
+#define applet_name "hush"
+#include "standalone.h"
+#define hush_main main
+#undef CONFIG_FEATURE_SH_FANCY_PROMPT
+#define BB_BANNER
+#endif
+#endif
+#define SPECIAL_VAR_SYMBOL 03
+#define SUBSTED_VAR_SYMBOL 04
+#ifndef __U_BOOT__
+#define FLAG_EXIT_FROM_LOOP 1
+#define FLAG_PARSE_SEMICOLON (1 << 1)		/* symbol ';' is special for parser */
+#define FLAG_REPARSING       (1 << 2)		/* >= 2nd pass */
+
+#endif
+
+#ifdef __U_BOOT__
+DECLARE_GLOBAL_DATA_PTR;
+
+#define EXIT_SUCCESS 0
+#define EOF -1
+#define syntax() syntax_err()
+#define xstrdup strdup
+#define error_msg printf
+#else
+typedef enum {
+	REDIRECT_INPUT     = 1,
+	REDIRECT_OVERWRITE = 2,
+	REDIRECT_APPEND    = 3,
+	REDIRECT_HEREIS    = 4,
+	REDIRECT_IO        = 5
+} redir_type;
+
+/* The descrip member of this structure is only used to make debugging
+ * output pretty */
+struct {int mode; int default_fd; char *descrip;} redir_table[] = {
+	{ 0,                         0, "()" },
+	{ O_RDONLY,                  0, "<"  },
+	{ O_CREAT|O_TRUNC|O_WRONLY,  1, ">"  },
+	{ O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
+	{ O_RDONLY,                 -1, "<<" },
+	{ O_RDWR,                    1, "<>" }
+};
+#endif
+
+typedef enum {
+	PIPE_SEQ = 1,
+	PIPE_AND = 2,
+	PIPE_OR  = 3,
+	PIPE_BG  = 4,
+} pipe_style;
+
+/* might eventually control execution */
+typedef enum {
+	RES_NONE  = 0,
+	RES_IF    = 1,
+	RES_THEN  = 2,
+	RES_ELIF  = 3,
+	RES_ELSE  = 4,
+	RES_FI    = 5,
+	RES_FOR   = 6,
+	RES_WHILE = 7,
+	RES_UNTIL = 8,
+	RES_DO    = 9,
+	RES_DONE  = 10,
+	RES_XXXX  = 11,
+	RES_IN    = 12,
+	RES_SNTX  = 13
+} reserved_style;
+#define FLAG_END   (1<<RES_NONE)
+#define FLAG_IF    (1<<RES_IF)
+#define FLAG_THEN  (1<<RES_THEN)
+#define FLAG_ELIF  (1<<RES_ELIF)
+#define FLAG_ELSE  (1<<RES_ELSE)
+#define FLAG_FI    (1<<RES_FI)
+#define FLAG_FOR   (1<<RES_FOR)
+#define FLAG_WHILE (1<<RES_WHILE)
+#define FLAG_UNTIL (1<<RES_UNTIL)
+#define FLAG_DO    (1<<RES_DO)
+#define FLAG_DONE  (1<<RES_DONE)
+#define FLAG_IN    (1<<RES_IN)
+#define FLAG_START (1<<RES_XXXX)
+
+/* This holds pointers to the various results of parsing */
+struct p_context {
+	struct child_prog *child;
+	struct pipe *list_head;
+	struct pipe *pipe;
+#ifndef __U_BOOT__
+	struct redir_struct *pending_redirect;
+#endif
+	reserved_style w;
+	int old_flag;				/* for figuring out valid reserved words */
+	struct p_context *stack;
+	int type;			/* define type of parser : ";$" common or special symbol */
+	/* How about quoting status? */
+};
+
+#ifndef __U_BOOT__
+struct redir_struct {
+	redir_type type;			/* type of redirection */
+	int fd;						/* file descriptor being redirected */
+	int dup;					/* -1, or file descriptor being duplicated */
+	struct redir_struct *next;	/* pointer to the next redirect in the list */
+	glob_t word;				/* *word.gl_pathv is the filename */
+};
+#endif
+
+struct child_prog {
+#ifndef __U_BOOT__
+	pid_t pid;					/* 0 if exited */
+#endif
+	char **argv;				/* program name and arguments */
+	/* was quoted when parsed; copy of struct o_string.nonnull field */
+	int *argv_nonnull;
+#ifdef __U_BOOT__
+	int    argc;                            /* number of program arguments */
+#endif
+	struct pipe *group;			/* if non-NULL, first in group or subshell */
+#ifndef __U_BOOT__
+	int subshell;				/* flag, non-zero if group must be forked */
+	struct redir_struct *redirects;	/* I/O redirections */
+	glob_t glob_result;			/* result of parameter globbing */
+	int is_stopped;				/* is the program currently running? */
+	struct pipe *family;		/* pointer back to the child's parent pipe */
+#endif
+	int sp;				/* number of SPECIAL_VAR_SYMBOL */
+	int type;
+};
+
+struct pipe {
+#ifndef __U_BOOT__
+	int jobid;					/* job number */
+#endif
+	int num_progs;				/* total number of programs in job */
+#ifndef __U_BOOT__
+	int running_progs;			/* 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 */
+#endif
+	struct child_prog *progs;	/* array of commands in pipe */
+	struct pipe *next;			/* to track background commands */
+#ifndef __U_BOOT__
+	int stopped_progs;			/* number of programs alive, but stopped */
+	int job_context;			/* bitmask defining current context */
+#endif
+	pipe_style followup;		/* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
+	reserved_style r_mode;		/* supports if, for, while, until */
+};
+
+#ifndef __U_BOOT__
+struct close_me {
+	int fd;
+	struct close_me *next;
+};
+#endif
+
+struct variables {
+	char *name;
+	char *value;
+	int flg_export;
+	int flg_read_only;
+	struct variables *next;
+};
+
+/* globals, connect us to the outside world
+ * the first three support $?, $#, and $1 */
+#ifndef __U_BOOT__
+char **global_argv;
+unsigned int global_argc;
+#endif
+static unsigned int last_return_code;
+#ifndef __U_BOOT__
+extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
+#endif
+
+/* "globals" within this file */
+static uchar *ifs;
+static char map[256];
+#ifndef __U_BOOT__
+static int fake_mode;
+static int interactive;
+static struct close_me *close_me_head;
+static const char *cwd;
+static struct pipe *job_list;
+static unsigned int last_bg_pid;
+static unsigned int last_jobid;
+static unsigned int shell_terminal;
+static char *PS1;
+static char *PS2;
+struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
+struct variables *top_vars = &shell_ver;
+#else
+static int flag_repeat = 0;
+static int do_repeat = 0;
+static struct variables *top_vars = NULL ;
+#endif /*__U_BOOT__ */
+
+#define B_CHUNK (100)
+#define B_NOSPAC 1
+
+typedef struct {
+	char *data;
+	int length;
+	int maxlen;
+	int quote;
+	int nonnull;
+} o_string;
+#define NULL_O_STRING {NULL,0,0,0,0}
+/* used for initialization:
+	o_string foo = NULL_O_STRING; */
+
+/* I can almost use ordinary FILE *.  Is open_memstream() universally
+ * available?  Where is it documented? */
+struct in_str {
+	const char *p;
+#ifndef __U_BOOT__
+	char peek_buf[2];
+#endif
+	int __promptme;
+	int promptmode;
+#ifndef __U_BOOT__
+	FILE *file;
+#endif
+	int (*get) (struct in_str *);
+	int (*peek) (struct in_str *);
+};
+#define b_getch(input) ((input)->get(input))
+#define b_peek(input) ((input)->peek(input))
+
+#ifndef __U_BOOT__
+#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
+
+struct built_in_command {
+	char *cmd;					/* name */
+	char *descr;				/* description */
+	int (*function) (struct child_prog *);	/* function ptr */
+};
+#endif
+
+/* define DEBUG_SHELL for debugging output (obviously ;-)) */
+#if 0
+#define DEBUG_SHELL
+#endif
+
+/* This should be in utility.c */
+#ifdef DEBUG_SHELL
+#ifndef __U_BOOT__
+static void debug_printf(const char *format, ...)
+{
+	va_list args;
+	va_start(args, format);
+	vfprintf(stderr, format, args);
+	va_end(args);
+}
+#else
+#define debug_printf(fmt,args...)	printf (fmt ,##args)
+#endif
+#else
+static inline void debug_printf(const char *format, ...) { }
+#endif
+#define final_printf debug_printf
+
+#ifdef __U_BOOT__
+static void syntax_err(void) {
+	 printf("syntax error\n");
+}
+#else
+static void __syntax(char *file, int line) {
+	error_msg("syntax error %s:%d", file, line);
+}
+#define syntax() __syntax(__FILE__, __LINE__)
+#endif
+
+#ifdef __U_BOOT__
+static void *xmalloc(size_t size);
+static void *xrealloc(void *ptr, size_t size);
+#else
+/* Index of subroutines: */
+/*   function prototypes for builtins */
+static int builtin_cd(struct child_prog *child);
+static int builtin_env(struct child_prog *child);
+static int builtin_eval(struct child_prog *child);
+static int builtin_exec(struct child_prog *child);
+static int builtin_exit(struct child_prog *child);
+static int builtin_export(struct child_prog *child);
+static int builtin_fg_bg(struct child_prog *child);
+static int builtin_help(struct child_prog *child);
+static int builtin_jobs(struct child_prog *child);
+static int builtin_pwd(struct child_prog *child);
+static int builtin_read(struct child_prog *child);
+static int builtin_set(struct child_prog *child);
+static int builtin_shift(struct child_prog *child);
+static int builtin_source(struct child_prog *child);
+static int builtin_umask(struct child_prog *child);
+static int builtin_unset(struct child_prog *child);
+static int builtin_not_written(struct child_prog *child);
+#endif
+/*   o_string manipulation: */
+static int b_check_space(o_string *o, int len);
+static int b_addchr(o_string *o, int ch);
+static void b_reset(o_string *o);
+static int b_addqchr(o_string *o, int ch, int quote);
+#ifndef __U_BOOT__
+static int b_adduint(o_string *o, unsigned int i);
+#endif
+/*  in_str manipulations: */
+static int static_get(struct in_str *i);
+static int static_peek(struct in_str *i);
+static int file_get(struct in_str *i);
+static int file_peek(struct in_str *i);
+#ifndef __U_BOOT__
+static void setup_file_in_str(struct in_str *i, FILE *f);
+#else
+static void setup_file_in_str(struct in_str *i);
+#endif
+static void setup_string_in_str(struct in_str *i, const char *s);
+#ifndef __U_BOOT__
+/*  close_me manipulations: */
+static void mark_open(int fd);
+static void mark_closed(int fd);
+static void close_all(void);
+#endif
+/*  "run" the final data structures: */
+static char *indenter(int i);
+static int free_pipe_list(struct pipe *head, int indent);
+static int free_pipe(struct pipe *pi, int indent);
+/*  really run the final data structures: */
+#ifndef __U_BOOT__
+static int setup_redirects(struct child_prog *prog, int squirrel[]);
+#endif
+static int run_list_real(struct pipe *pi);
+#ifndef __U_BOOT__
+static void pseudo_exec(struct child_prog *child) __attribute__ ((noreturn));
+#endif
+static int run_pipe_real(struct pipe *pi);
+/*   extended glob support: */
+#ifndef __U_BOOT__
+static int globhack(const char *src, int flags, glob_t *pglob);
+static int glob_needed(const char *s);
+static int xglob(o_string *dest, int flags, glob_t *pglob);
+#endif
+/*   variable assignment: */
+static int is_assignment(const char *s);
+/*   data structure manipulation: */
+#ifndef __U_BOOT__
+static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
+#endif
+static void initialize_context(struct p_context *ctx);
+static int done_word(o_string *dest, struct p_context *ctx);
+static int done_command(struct p_context *ctx);
+static int done_pipe(struct p_context *ctx, pipe_style type);
+/*   primary string parsing: */
+#ifndef __U_BOOT__
+static int redirect_dup_num(struct in_str *input);
+static int redirect_opt_num(o_string *o);
+static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end);
+static int parse_group(o_string *dest, struct p_context *ctx, struct in_str *input, int ch);
+#endif
+static char *lookup_param(char *src);
+static char *make_string(char **inp, int *nonnull);
+static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input);
+#ifndef __U_BOOT__
+static int parse_string(o_string *dest, struct p_context *ctx, const char *src);
+#endif
+static int parse_stream(o_string *dest, struct p_context *ctx, struct in_str *input0, int end_trigger);
+/*   setup: */
+static int parse_stream_outer(struct in_str *inp, int flag);
+#ifndef __U_BOOT__
+static int parse_string_outer(const char *s, int flag);
+static int parse_file_outer(FILE *f);
+#endif
+#ifndef __U_BOOT__
+/*   job management: */
+static int checkjobs(struct pipe* fg_pipe);
+static void insert_bg_job(struct pipe *pi);
+static void remove_bg_job(struct pipe *pi);
+#endif
+/*     local variable support */
+static char **make_list_in(char **inp, char *name);
+static char *insert_var_value(char *inp);
+static char *insert_var_value_sub(char *inp, int tag_subst);
+
+#ifndef __U_BOOT__
+/* Table of built-in functions.  They can be forked or not, depending on
+ * context: within pipes, they fork.  As simple commands, they do not.
+ * When used in non-forking context, they can change global variables
+ * in the parent shell process.  If forked, of course they can not.
+ * For example, 'unset foo | whatever' will parse and run, but foo will
+ * still be set at the end. */
+static struct built_in_command bltins[] = {
+	{"bg", "Resume a job in the background", builtin_fg_bg},
+	{"break", "Exit for, while or until loop", builtin_not_written},
+	{"cd", "Change working directory", builtin_cd},
+	{"continue", "Continue for, while or until loop", builtin_not_written},
+	{"env", "Print all environment variables", builtin_env},
+	{"eval", "Construct and run shell command", builtin_eval},
+	{"exec", "Exec command, replacing this shell with the exec'd process",
+		builtin_exec},
+	{"exit", "Exit from shell()", builtin_exit},
+	{"export", "Set environment variable", builtin_export},
+	{"fg", "Bring job into the foreground", builtin_fg_bg},
+	{"jobs", "Lists the active jobs", builtin_jobs},
+	{"pwd", "Print current directory", builtin_pwd},
+	{"read", "Input environment variable", builtin_read},
+	{"return", "Return from a function", builtin_not_written},
+	{"set", "Set/unset shell local variables", builtin_set},
+	{"shift", "Shift positional parameters", builtin_shift},
+	{"trap", "Trap signals", builtin_not_written},
+	{"ulimit","Controls resource limits", builtin_not_written},
+	{"umask","Sets file creation mask", builtin_umask},
+	{"unset", "Unset environment variable", builtin_unset},
+	{".", "Source-in and run commands in a file", builtin_source},
+	{"help", "List shell built-in commands", builtin_help},
+	{NULL, NULL, NULL}
+};
+
+static const char *set_cwd(void)
+{
+	if(cwd==unknown)
+		cwd = NULL;     /* xgetcwd(arg) called free(arg) */
+	cwd = xgetcwd((char *)cwd);
+	if (!cwd)
+		cwd = unknown;
+	return cwd;
+}
+
+/* built-in 'eval' handler */
+static int builtin_eval(struct child_prog *child)
+{
+	char *str = NULL;
+	int rcode = EXIT_SUCCESS;
+
+	if (child->argv[1]) {
+		str = make_string(child->argv + 1);
+		parse_string_outer(str, FLAG_EXIT_FROM_LOOP |
+					FLAG_PARSE_SEMICOLON);
+		free(str);
+		rcode = last_return_code;
+	}
+	return rcode;
+}
+
+/* built-in 'cd <path>' handler */
+static int builtin_cd(struct child_prog *child)
+{
+	char *newdir;
+	if (child->argv[1] == NULL)
+		newdir = getenv("HOME");
+	else
+		newdir = child->argv[1];
+	if (chdir(newdir)) {
+		printf("cd: %s: %s\n", newdir, strerror(errno));
+		return EXIT_FAILURE;
+	}
+	set_cwd();
+	return EXIT_SUCCESS;
+}
+
+/* built-in 'env' handler */
+static int builtin_env(struct child_prog *dummy)
+{
+	char **e = environ;
+	if (e == NULL) return EXIT_FAILURE;
+	for (; *e; e++) {
+		puts(*e);
+	}
+	return EXIT_SUCCESS;
+}
+
+/* built-in 'exec' handler */
+static int builtin_exec(struct child_prog *child)
+{
+	if (child->argv[1] == NULL)
+		return EXIT_SUCCESS;   /* Really? */
+	child->argv++;
+	pseudo_exec(child);
+	/* never returns */
+}
+
+/* built-in 'exit' handler */
+static int builtin_exit(struct child_prog *child)
+{
+	if (child->argv[1] == NULL)
+		exit(last_return_code);
+	exit (atoi(child->argv[1]));
+}
+
+/* built-in 'export VAR=value' handler */
+static int builtin_export(struct child_prog *child)
+{
+	int res = 0;
+	char *name = child->argv[1];
+
+	if (name == NULL) {
+		return (builtin_env(child));
+	}
+
+	name = strdup(name);
+
+	if(name) {
+		char *value = strchr(name, '=');
+
+		if (!value) {
+			char *tmp;
+			/* They are exporting something without an =VALUE */
+
+			value = get_local_var(name);
+			if (value) {
+				size_t ln = strlen(name);
+
+				tmp = realloc(name, ln+strlen(value)+2);
+				if(tmp==NULL)
+					res = -1;
+				else {
+					sprintf(tmp+ln, "=%s", value);
+					name = tmp;
+				}
+			} else {
+				/* bash does not return an error when trying to export
+				 * an undefined variable.  Do likewise. */
+				res = 1;
+			}
+		}
+	}
+	if (res<0)
+		perror_msg("export");
+	else if(res==0)
+		res = set_local_var(name, 1);
+	else
+		res = 0;
+	free(name);
+	return res;
+}
+
+/* built-in 'fg' and 'bg' handler */
+static int builtin_fg_bg(struct child_prog *child)
+{
+	int i, jobnum;
+	struct pipe *pi=NULL;
+
+	if (!interactive)
+		return EXIT_FAILURE;
+	/* If they gave us no args, assume they want the last backgrounded task */
+	if (!child->argv[1]) {
+		for (pi = job_list; pi; pi = pi->next) {
+			if (pi->jobid == last_jobid) {
+				break;
+			}
+		}
+		if (!pi) {
+			error_msg("%s: no current job", child->argv[0]);
+			return EXIT_FAILURE;
+		}
+	} else {
+		if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) {
+			error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]);
+			return EXIT_FAILURE;
+		}
+		for (pi = job_list; pi; pi = pi->next) {
+			if (pi->jobid == jobnum) {
+				break;
+			}
+		}
+		if (!pi) {
+			error_msg("%s: %d: no such job", child->argv[0], jobnum);
+			return EXIT_FAILURE;
+		}
+	}
+
+	if (*child->argv[0] == 'f') {
+		/* Put the job into the foreground.  */
+		tcsetpgrp(shell_terminal, pi->pgrp);
+	}
+
+	/* Restart the processes in the job */
+	for (i = 0; i < pi->num_progs; i++)
+		pi->progs[i].is_stopped = 0;
+
+	if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) {
+		if (i == ESRCH) {
+			remove_bg_job(pi);
+		} else {
+			perror_msg("kill (SIGCONT)");
+		}
+	}
+
+	pi->stopped_progs = 0;
+	return EXIT_SUCCESS;
+}
+
+/* built-in 'help' handler */
+static int builtin_help(struct child_prog *dummy)
+{
+	struct built_in_command *x;
+
+	printf("\nBuilt-in commands:\n");
+	printf("-------------------\n");
+	for (x = bltins; x->cmd; x++) {
+		if (x->descr==NULL)
+			continue;
+		printf("%s\t%s\n", x->cmd, x->descr);
+	}
+	printf("\n\n");
+	return EXIT_SUCCESS;
+}
+
+/* built-in 'jobs' handler */
+static int builtin_jobs(struct child_prog *child)
+{
+	struct pipe *job;
+	char *status_string;
+
+	for (job = job_list; job; job = job->next) {
+		if (job->running_progs == job->stopped_progs)
+			status_string = "Stopped";
+		else
+			status_string = "Running";
+
+		printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text);
+	}
+	return EXIT_SUCCESS;
+}
+
+
+/* built-in 'pwd' handler */
+static int builtin_pwd(struct child_prog *dummy)
+{
+	puts(set_cwd());
+	return EXIT_SUCCESS;
+}
+
+/* built-in 'read VAR' handler */
+static int builtin_read(struct child_prog *child)
+{
+	int res;
+
+	if (child->argv[1]) {
+		char string[BUFSIZ];
+		char *var = 0;
+
+		string[0] = 0;  /* In case stdin has only EOF */
+		/* read string */
+		fgets(string, sizeof(string), stdin);
+		chomp(string);
+		var = malloc(strlen(child->argv[1])+strlen(string)+2);
+		if(var) {
+			sprintf(var, "%s=%s", child->argv[1], string);
+			res = set_local_var(var, 0);
+		} else
+			res = -1;
+		if (res)
+			fprintf(stderr, "read: %m\n");
+		free(var);      /* So not move up to avoid breaking errno */
+		return res;
+	} else {
+		do res=getchar(); while(res!='\n' && res!=EOF);
+		return 0;
+	}
+}
+
+/* built-in 'set VAR=value' handler */
+static int builtin_set(struct child_prog *child)
+{
+	char *temp = child->argv[1];
+	struct variables *e;
+
+	if (temp == NULL)
+		for(e = top_vars; e; e=e->next)
+			printf("%s=%s\n", e->name, e->value);
+	else
+		set_local_var(temp, 0);
+
+		return EXIT_SUCCESS;
+}
+
+
+/* Built-in 'shift' handler */
+static int builtin_shift(struct child_prog *child)
+{
+	int n=1;
+	if (child->argv[1]) {
+		n=atoi(child->argv[1]);
+	}
+	if (n>=0 && n<global_argc) {
+		/* XXX This probably breaks $0 */
+		global_argc -= n;
+		global_argv += n;
+		return EXIT_SUCCESS;
+	} else {
+		return EXIT_FAILURE;
+	}
+}
+
+/* Built-in '.' handler (read-in and execute commands from file) */
+static int builtin_source(struct child_prog *child)
+{
+	FILE *input;
+	int status;
+
+	if (child->argv[1] == NULL)
+		return EXIT_FAILURE;
+
+	/* XXX search through $PATH is missing */
+	input = fopen(child->argv[1], "r");
+	if (!input) {
+		error_msg("Couldn't open file '%s'", child->argv[1]);
+		return EXIT_FAILURE;
+	}
+
+	/* Now run the file */
+	/* XXX argv and argc are broken; need to save old global_argv
+	 * (pointer only is OK!) on this stack frame,
+	 * set global_argv=child->argv+1, recurse, and restore. */
+	mark_open(fileno(input));
+	status = parse_file_outer(input);
+	mark_closed(fileno(input));
+	fclose(input);
+	return (status);
+}
+
+static int builtin_umask(struct child_prog *child)
+{
+	mode_t new_umask;
+	const char *arg = child->argv[1];
+	char *end;
+	if (arg) {
+		new_umask=strtoul(arg, &end, 8);
+		if (*end!='\0' || end == arg) {
+			return EXIT_FAILURE;
+		}
+	} else {
+		printf("%.3o\n", (unsigned int) (new_umask=umask(0)));
+	}
+	umask(new_umask);
+	return EXIT_SUCCESS;
+}
+
+/* built-in 'unset VAR' handler */
+static int builtin_unset(struct child_prog *child)
+{
+	/* bash returned already true */
+	unset_local_var(child->argv[1]);
+	return EXIT_SUCCESS;
+}
+
+static int builtin_not_written(struct child_prog *child)
+{
+	printf("builtin_%s not written\n",child->argv[0]);
+	return EXIT_FAILURE;
+}
+#endif
+
+static int b_check_space(o_string *o, int len)
+{
+	/* It would be easy to drop a more restrictive policy
+	 * in here, such as setting a maximum string length */
+	if (o->length + len > o->maxlen) {
+		char *old_data = o->data;
+		/* assert (data == NULL || o->maxlen != 0); */
+		o->maxlen += max(2*len, B_CHUNK);
+		o->data = realloc(o->data, 1 + o->maxlen);
+		if (o->data == NULL) {
+			free(old_data);
+		}
+	}
+	return o->data == NULL;
+}
+
+static int b_addchr(o_string *o, int ch)
+{
+	debug_printf("b_addchr: %c %d %p\n", ch, o->length, o);
+	if (b_check_space(o, 1)) return B_NOSPAC;
+	o->data[o->length] = ch;
+	o->length++;
+	o->data[o->length] = '\0';
+	return 0;
+}
+
+static void b_reset(o_string *o)
+{
+	o->length = 0;
+	o->nonnull = 0;
+	if (o->data != NULL) *o->data = '\0';
+}
+
+static void b_free(o_string *o)
+{
+	b_reset(o);
+	free(o->data);
+	o->data = NULL;
+	o->maxlen = 0;
+}
+
+/* My analysis of quoting semantics tells me that state information
+ * is associated with a destination, not a source.
+ */
+static int b_addqchr(o_string *o, int ch, int quote)
+{
+	if (quote && strchr("*?[\\",ch)) {
+		int rc;
+		rc = b_addchr(o, '\\');
+		if (rc) return rc;
+	}
+	return b_addchr(o, ch);
+}
+
+#ifndef __U_BOOT__
+static int b_adduint(o_string *o, unsigned int i)
+{
+	int r;
+	char *p = simple_itoa(i);
+	/* no escape checking necessary */
+	do r=b_addchr(o, *p++); while (r==0 && *p);
+	return r;
+}
+#endif
+
+static int static_get(struct in_str *i)
+{
+	int ch = *i->p++;
+	if (ch=='\0') return EOF;
+	return ch;
+}
+
+static int static_peek(struct in_str *i)
+{
+	return *i->p;
+}
+
+#ifndef __U_BOOT__
+static inline void cmdedit_set_initial_prompt(void)
+{
+#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
+	PS1 = NULL;
+#else
+	PS1 = getenv("PS1");
+	if(PS1==0)
+		PS1 = "\\w \\$ ";
+#endif
+}
+
+static inline void setup_prompt_string(int promptmode, char **prompt_str)
+{
+	debug_printf("setup_prompt_string %d ",promptmode);
+#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
+	/* Set up the prompt */
+	if (promptmode == 1) {
+		free(PS1);
+		PS1=xmalloc(strlen(cwd)+4);
+		sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ?  "$ ":"# ");
+		*prompt_str = PS1;
+	} else {
+		*prompt_str = PS2;
+	}
+#else
+	*prompt_str = (promptmode==1)? PS1 : PS2;
+#endif
+	debug_printf("result %s\n",*prompt_str);
+}
+#endif
+
+static void get_user_input(struct in_str *i)
+{
+#ifndef __U_BOOT__
+	char *prompt_str;
+	static char the_command[BUFSIZ];
+
+	setup_prompt_string(i->promptmode, &prompt_str);
+#ifdef CONFIG_FEATURE_COMMAND_EDITING
+	/*
+	 ** enable command line editing only while a command line
+	 ** is actually being read; otherwise, we'll end up bequeathing
+	 ** atexit() handlers and other unwanted stuff to our
+	 ** child processes (rob@sysgo.de)
+	 */
+	cmdedit_read_input(prompt_str, the_command);
+#else
+	fputs(prompt_str, stdout);
+	fflush(stdout);
+	the_command[0]=fgetc(i->file);
+	the_command[1]='\0';
+#endif
+	fflush(stdout);
+	i->p = the_command;
+#else
+	int n;
+	static char the_command[CONFIG_SYS_CBSIZE + 1];
+
+#ifdef CONFIG_BOOT_RETRY_TIME
+#  ifndef CONFIG_RESET_TO_RETRY
+#	error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
+#  endif
+	reset_cmd_timeout();
+#endif
+	i->__promptme = 1;
+	if (i->promptmode == 1) {
+		n = readline(CONFIG_SYS_PROMPT);
+	} else {
+		n = readline(CONFIG_SYS_PROMPT_HUSH_PS2);
+	}
+#ifdef CONFIG_BOOT_RETRY_TIME
+	if (n == -2) {
+	  puts("\nTimeout waiting for command\n");
+#  ifdef CONFIG_RESET_TO_RETRY
+	  do_reset(NULL, 0, 0, NULL);
+#  else
+#	error "This currently only works with CONFIG_RESET_TO_RETRY enabled"
+#  endif
+	}
+#endif
+	if (n == -1 ) {
+		flag_repeat = 0;
+		i->__promptme = 0;
+	}
+	n = strlen(console_buffer);
+	console_buffer[n] = '\n';
+	console_buffer[n+1]= '\0';
+	if (had_ctrlc()) flag_repeat = 0;
+	clear_ctrlc();
+	do_repeat = 0;
+	if (i->promptmode == 1) {
+		if (console_buffer[0] == '\n'&& flag_repeat == 0) {
+			strcpy(the_command,console_buffer);
+		}
+		else {
+			if (console_buffer[0] != '\n') {
+				strcpy(the_command,console_buffer);
+				flag_repeat = 1;
+			}
+			else {
+				do_repeat = 1;
+			}
+		}
+		i->p = the_command;
+	}
+	else {
+		if (console_buffer[0] != '\n') {
+			if (strlen(the_command) + strlen(console_buffer)
+			    < CONFIG_SYS_CBSIZE) {
+				n = strlen(the_command);
+				the_command[n-1] = ' ';
+				strcpy(&the_command[n],console_buffer);
+			}
+			else {
+				the_command[0] = '\n';
+				the_command[1] = '\0';
+				flag_repeat = 0;
+			}
+		}
+		if (i->__promptme == 0) {
+			the_command[0] = '\n';
+			the_command[1] = '\0';
+		}
+		i->p = console_buffer;
+	}
+#endif
+}
+
+/* This is the magic location that prints prompts
+ * and gets data back from the user */
+static int file_get(struct in_str *i)
+{
+	int ch;
+
+	ch = 0;
+	/* If there is data waiting, eat it up */
+	if (i->p && *i->p) {
+		ch = *i->p++;
+	} else {
+		/* need to double check i->file because we might be doing something
+		 * more complicated by now, like sourcing or substituting. */
+#ifndef __U_BOOT__
+		if (i->__promptme && interactive && i->file == stdin) {
+			while(! i->p || (interactive && strlen(i->p)==0) ) {
+#else
+			while(! i->p  || strlen(i->p)==0 ) {
+#endif
+				get_user_input(i);
+			}
+			i->promptmode=2;
+#ifndef __U_BOOT__
+			i->__promptme = 0;
+#endif
+			if (i->p && *i->p) {
+				ch = *i->p++;
+			}
+#ifndef __U_BOOT__
+		} else {
+			ch = fgetc(i->file);
+		}
+
+#endif
+		debug_printf("b_getch: got a %d\n", ch);
+	}
+#ifndef __U_BOOT__
+	if (ch == '\n') i->__promptme=1;
+#endif
+	return ch;
+}
+
+/* All the callers guarantee this routine will never be
+ * used right after a newline, so prompting is not needed.
+ */
+static int file_peek(struct in_str *i)
+{
+#ifndef __U_BOOT__
+	if (i->p && *i->p) {
+#endif
+		return *i->p;
+#ifndef __U_BOOT__
+	} else {
+		i->peek_buf[0] = fgetc(i->file);
+		i->peek_buf[1] = '\0';
+		i->p = i->peek_buf;
+		debug_printf("b_peek: got a %d\n", *i->p);
+		return *i->p;
+	}
+#endif
+}
+
+#ifndef __U_BOOT__
+static void setup_file_in_str(struct in_str *i, FILE *f)
+#else
+static void setup_file_in_str(struct in_str *i)
+#endif
+{
+	i->peek = file_peek;
+	i->get = file_get;
+	i->__promptme=1;
+	i->promptmode=1;
+#ifndef __U_BOOT__
+	i->file = f;
+#endif
+	i->p = NULL;
+}
+
+static void setup_string_in_str(struct in_str *i, const char *s)
+{
+	i->peek = static_peek;
+	i->get = static_get;
+	i->__promptme=1;
+	i->promptmode=1;
+	i->p = s;
+}
+
+#ifndef __U_BOOT__
+static void mark_open(int fd)
+{
+	struct close_me *new = xmalloc(sizeof(struct close_me));
+	new->fd = fd;
+	new->next = close_me_head;
+	close_me_head = new;
+}
+
+static void mark_closed(int fd)
+{
+	struct close_me *tmp;
+	if (close_me_head == NULL || close_me_head->fd != fd)
+		error_msg_and_die("corrupt close_me");
+	tmp = close_me_head;
+	close_me_head = close_me_head->next;
+	free(tmp);
+}
+
+static void close_all(void)
+{
+	struct close_me *c;
+	for (c=close_me_head; c; c=c->next) {
+		close(c->fd);
+	}
+	close_me_head = NULL;
+}
+
+/* squirrel != NULL means we squirrel away copies of stdin, stdout,
+ * and stderr if they are redirected. */
+static int setup_redirects(struct child_prog *prog, int squirrel[])
+{
+	int openfd, mode;
+	struct redir_struct *redir;
+
+	for (redir=prog->redirects; redir; redir=redir->next) {
+		if (redir->dup == -1 && redir->word.gl_pathv == NULL) {
+			/* something went wrong in the parse.  Pretend it didn't happen */
+			continue;
+		}
+		if (redir->dup == -1) {
+			mode=redir_table[redir->type].mode;
+			openfd = open(redir->word.gl_pathv[0], 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!) */
+				perror_msg("error opening %s", redir->word.gl_pathv[0]);
+				return 1;
+			}
+		} else {
+			openfd = redir->dup;
+		}
+
+		if (openfd != redir->fd) {
+			if (squirrel && redir->fd < 3) {
+				squirrel[redir->fd] = dup(redir->fd);
+			}
+			if (openfd == -3) {
+				close(openfd);
+			} else {
+				dup2(openfd, redir->fd);
+				if (redir->dup == -1)
+					close (openfd);
+			}
+		}
+	}
+	return 0;
+}
+
+static void restore_redirects(int squirrel[])
+{
+	int i, fd;
+	for (i=0; i<3; i++) {
+		fd = squirrel[i];
+		if (fd != -1) {
+			/* No error checking.  I sure wouldn't know what
+			 * to do with an error if I found one! */
+			dup2(fd, i);
+			close(fd);
+		}
+	}
+}
+
+/* never returns */
+/* XXX no exit() here.  If you don't exec, use _exit instead.
+ * The at_exit handlers apparently confuse the calling process,
+ * in particular stdin handling.  Not sure why? */
+static void pseudo_exec(struct child_prog *child)
+{
+	int i, rcode;
+	char *p;
+	struct built_in_command *x;
+	if (child->argv) {
+		for (i=0; is_assignment(child->argv[i]); i++) {
+			debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]);
+			p = insert_var_value(child->argv[i]);
+			putenv(strdup(p));
+			if (p != child->argv[i]) free(p);
+		}
+		child->argv+=i;  /* XXX this hack isn't so horrible, since we are about
+					to exit, and therefore don't need to keep data
+					structures consistent for free() use. */
+		/* If a variable is assigned in a forest, and nobody listens,
+		 * was it ever really set?
+		 */
+		if (child->argv[0] == NULL) {
+			_exit(EXIT_SUCCESS);
+		}
+
+		/*
+		 * Check if the command matches any of the builtins.
+		 * Depending on context, this might be redundant.  But it's
+		 * easier to waste a few CPU cycles than it is to figure out
+		 * if this is one of those cases.
+		 */
+		for (x = bltins; x->cmd; x++) {
+			if (strcmp(child->argv[0], x->cmd) == 0 ) {
+				debug_printf("builtin exec %s\n", child->argv[0]);
+				rcode = x->function(child);
+				fflush(stdout);
+				_exit(rcode);
+			}
+		}
+
+		/* Check if the command matches any busybox internal commands
+		 * ("applets") here.
+		 * FIXME: This feature is not 100% safe, since
+		 * BusyBox is not fully reentrant, so we have no guarantee the things
+		 * from the .bss are still zeroed, or that things from .data are still
+		 * at their defaults.  We could exec ourself from /proc/self/exe, but I
+		 * really dislike relying on /proc for things.  We could exec ourself
+		 * from global_argv[0], but if we are in a chroot, we may not be able
+		 * to find ourself... */
+#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
+		{
+			int argc_l;
+			char** argv_l=child->argv;
+			char *name = child->argv[0];
+
+#ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
+			/* Following discussions from November 2000 on the busybox mailing
+			 * list, the default configuration, (without
+			 * get_last_path_component()) lets the user force use of an
+			 * external command by specifying the full (with slashes) filename.
+			 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets
+			 * _aways_ override external commands, so if you want to run
+			 * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the
+			 * filesystem and is _not_ busybox.  Some systems may want this,
+			 * most do not.  */
+			name = get_last_path_component(name);
+#endif
+			/* Count argc for use in a second... */
+			for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++);
+			optind = 1;
+			debug_printf("running applet %s\n", name);
+			run_applet_by_name(name, argc_l, child->argv);
+		}
+#endif
+		debug_printf("exec of %s\n",child->argv[0]);
+		execvp(child->argv[0],child->argv);
+		perror_msg("couldn't exec: %s",child->argv[0]);
+		_exit(1);
+	} else if (child->group) {
+		debug_printf("runtime nesting to group\n");
+		interactive=0;    /* crucial!!!! */
+		rcode = run_list_real(child->group);
+		/* OK to leak memory by not calling free_pipe_list,
+		 * since this process is about to exit */
+		_exit(rcode);
+	} else {
+		/* Can happen.  See what bash does with ">foo" by itself. */
+		debug_printf("trying to pseudo_exec null command\n");
+		_exit(EXIT_SUCCESS);
+	}
+}
+
+static void insert_bg_job(struct pipe *pi)
+{
+	struct pipe *thejob;
+
+	/* Linear search for the ID of the job to use */
+	pi->jobid = 1;
+	for (thejob = job_list; thejob; thejob = thejob->next)
+		if (thejob->jobid >= pi->jobid)
+			pi->jobid = thejob->jobid + 1;
+
+	/* add thejob to the list of running jobs */
+	if (!job_list) {
+		thejob = job_list = xmalloc(sizeof(*thejob));
+	} else {
+		for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */;
+		thejob->next = xmalloc(sizeof(*thejob));
+		thejob = thejob->next;
+	}
+
+	/* physically copy the struct job */
+	memcpy(thejob, pi, sizeof(struct pipe));
+	thejob->next = NULL;
+	thejob->running_progs = thejob->num_progs;
+	thejob->stopped_progs = 0;
+	thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */
+
+	/*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */
+	{
+		char *bar=thejob->text;
+		char **foo=pi->progs[0].argv;
+		while(foo && *foo) {
+			bar += sprintf(bar, "%s ", *foo++);
+		}
+	}
+
+	/* we don't wait for background thejobs to return -- append it
+	   to the list of backgrounded thejobs and leave it alone */
+	printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid);
+	last_bg_pid = thejob->progs[0].pid;
+	last_jobid = thejob->jobid;
+}
+
+/* remove a backgrounded job */
+static void remove_bg_job(struct pipe *pi)
+{
+	struct pipe *prev_pipe;
+
+	if (pi == job_list) {
+		job_list = pi->next;
+	} else {
+		prev_pipe = job_list;
+		while (prev_pipe->next != pi)
+			prev_pipe = prev_pipe->next;
+		prev_pipe->next = pi->next;
+	}
+	if (job_list)
+		last_jobid = job_list->jobid;
+	else
+		last_jobid = 0;
+
+	pi->stopped_progs = 0;
+	free_pipe(pi, 0);
+	free(pi);
+}
+
+/* Checks to see if any processes have exited -- if they
+   have, figure out why and see if a job has completed */
+static int checkjobs(struct pipe* fg_pipe)
+{
+	int attributes;
+	int status;
+	int prognum = 0;
+	struct pipe *pi;
+	pid_t childpid;
+
+	attributes = WUNTRACED;
+	if (fg_pipe==NULL) {
+		attributes |= WNOHANG;
+	}
+
+	while ((childpid = waitpid(-1, &status, attributes)) > 0) {
+		if (fg_pipe) {
+			int i, rcode = 0;
+			for (i=0; i < fg_pipe->num_progs; i++) {
+				if (fg_pipe->progs[i].pid == childpid) {
+					if (i==fg_pipe->num_progs-1)
+						rcode=WEXITSTATUS(status);
+					(fg_pipe->num_progs)--;
+					return(rcode);
+				}
+			}
+		}
+
+		for (pi = job_list; pi; pi = pi->next) {
+			prognum = 0;
+			while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) {
+				prognum++;
+			}
+			if (prognum < pi->num_progs)
+				break;
+		}
+
+		if(pi==NULL) {
+			debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
+			continue;
+		}
+
+		if (WIFEXITED(status) || WIFSIGNALED(status)) {
+			/* child exited */
+			pi->running_progs--;
+			pi->progs[prognum].pid = 0;
+
+			if (!pi->running_progs) {
+				printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text);
+				remove_bg_job(pi);
+			}
+		} else {
+			/* child stopped */
+			pi->stopped_progs++;
+			pi->progs[prognum].is_stopped = 1;
+
+#if 0
+			/* Printing this stuff is a pain, since it tends to
+			 * overwrite the prompt an inconveinient moments.  So
+			 * don't do that.  */
+			if (pi->stopped_progs == pi->num_progs) {
+				printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text);
+			}
+#endif
+		}
+	}
+
+	if (childpid == -1 && errno != ECHILD)
+		perror_msg("waitpid");
+
+	/* move the shell to the foreground */
+	/*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */
+	/*	perror_msg("tcsetpgrp-2"); */
+	return -1;
+}
+
+/* Figure out our controlling tty, checking in order stderr,
+ * stdin, and stdout.  If check_pgrp is set, also check that
+ * we belong to the foreground process group associated with
+ * that tty.  The value of shell_terminal is needed in order to call
+ * tcsetpgrp(shell_terminal, ...); */
+void controlling_tty(int check_pgrp)
+{
+	pid_t curpgrp;
+
+	if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0
+			&& (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0
+			&& (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0)
+		goto shell_terminal_error;
+
+	if (check_pgrp && curpgrp != getpgid(0))
+		goto shell_terminal_error;
+
+	return;
+
+shell_terminal_error:
+		shell_terminal = -1;
+		return;
+}
+#endif
+
+/* run_pipe_real() starts all the jobs, but doesn't wait for anything
+ * to finish.  See checkjobs().
+ *
+ * return code is normally -1, when the caller has to wait for children
+ * to finish to determine the exit status of the pipe.  If the pipe
+ * is a simple builtin command, however, the action is done by the
+ * time run_pipe_real returns, and the exit code is provided as the
+ * return value.
+ *
+ * The input of the pipe is always stdin, the output is always
+ * stdout.  The outpipe[] mechanism in BusyBox-0.48 lash is bogus,
+ * because it tries to avoid running the command substitution in
+ * subshell, when that is in fact necessary.  The subshell process
+ * now has its stdout directed to the input of the appropriate pipe,
+ * so this routine is noticeably simpler.
+ */
+static int run_pipe_real(struct pipe *pi)
+{
+	int i;
+#ifndef __U_BOOT__
+	int nextin, nextout;
+	int pipefds[2];				/* pipefds[0] is for reading */
+	struct child_prog *child;
+	struct built_in_command *x;
+	char *p;
+# if __GNUC__
+	/* Avoid longjmp clobbering */
+	(void) &i;
+	(void) &nextin;
+	(void) &nextout;
+	(void) &child;
+# endif
+#else
+	int nextin;
+	int flag = do_repeat ? CMD_FLAG_REPEAT : 0;
+	struct child_prog *child;
+	char *p;
+# if __GNUC__
+	/* Avoid longjmp clobbering */
+	(void) &i;
+	(void) &nextin;
+	(void) &child;
+# endif
+#endif	/* __U_BOOT__ */
+
+	nextin = 0;
+#ifndef __U_BOOT__
+	pi->pgrp = -1;
+#endif
+
+	/* Check if this is a simple builtin (not part of a pipe).
+	 * Builtins within pipes have to fork anyway, and are handled in
+	 * pseudo_exec.  "echo foo | read bar" doesn't work on bash, either.
+	 */
+	if (pi->num_progs == 1) child = & (pi->progs[0]);
+#ifndef __U_BOOT__
+	if (pi->num_progs == 1 && child->group && child->subshell == 0) {
+		int squirrel[] = {-1, -1, -1};
+		int rcode;
+		debug_printf("non-subshell grouping\n");
+		setup_redirects(child, squirrel);
+		/* XXX could we merge code with following builtin case,
+		 * by creating a pseudo builtin that calls run_list_real? */
+		rcode = run_list_real(child->group);
+		restore_redirects(squirrel);
+#else
+		if (pi->num_progs == 1 && child->group) {
+		int rcode;
+		debug_printf("non-subshell grouping\n");
+		rcode = run_list_real(child->group);
+#endif
+		return rcode;
+	} else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) {
+		for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ }
+		if (i!=0 && child->argv[i]==NULL) {
+			/* assignments, but no command: set the local environment */
+			for (i=0; child->argv[i]!=NULL; i++) {
+
+				/* Ok, this case is tricky.  We have to decide if this is a
+				 * local variable, or an already exported variable.  If it is
+				 * already exported, we have to export the new value.  If it is
+				 * not exported, we need only set this as a local variable.
+				 * This junk is all to decide whether or not to export this
+				 * variable. */
+				int export_me=0;
+				char *name, *value;
+				name = xstrdup(child->argv[i]);
+				debug_printf("Local environment set: %s\n", name);
+				value = strchr(name, '=');
+				if (value)
+					*value=0;
+#ifndef __U_BOOT__
+				if ( get_local_var(name)) {
+					export_me=1;
+				}
+#endif
+				free(name);
+				p = insert_var_value(child->argv[i]);
+				set_local_var(p, export_me);
+				if (p != child->argv[i]) free(p);
+			}
+			return EXIT_SUCCESS;   /* don't worry about errors in set_local_var() yet */
+		}
+		for (i = 0; is_assignment(child->argv[i]); i++) {
+			p = insert_var_value(child->argv[i]);
+#ifndef __U_BOOT__
+			putenv(strdup(p));
+#else
+			set_local_var(p, 0);
+#endif
+			if (p != child->argv[i]) {
+				child->sp--;
+				free(p);
+			}
+		}
+		if (child->sp) {
+			char * str = NULL;
+
+			str = make_string(child->argv + i,
+					  child->argv_nonnull + i);
+			parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING);
+			free(str);
+			return last_return_code;
+		}
+#ifndef __U_BOOT__
+		for (x = bltins; x->cmd; x++) {
+			if (strcmp(child->argv[i], x->cmd) == 0 ) {
+				int squirrel[] = {-1, -1, -1};
+				int rcode;
+				if (x->function == builtin_exec && child->argv[i+1]==NULL) {
+					debug_printf("magic exec\n");
+					setup_redirects(child,NULL);
+					return EXIT_SUCCESS;
+				}
+				debug_printf("builtin inline %s\n", child->argv[0]);
+				/* XXX setup_redirects acts on file descriptors, not FILEs.
+				 * This is perfect for work that comes after exec().
+				 * Is it really safe for inline use?  Experimentally,
+				 * things seem to work with glibc. */
+				setup_redirects(child, squirrel);
+
+				child->argv += i;  /* XXX horrible hack */
+				rcode = x->function(child);
+				/* XXX restore hack so free() can work right */
+				child->argv -= i;
+				restore_redirects(squirrel);
+			}
+			return rcode;
+		}
+#else
+		/* check ";", because ,example , argv consist from
+		 * "help;flinfo" must not execute
+		 */
+		if (strchr(child->argv[i], ';')) {
+			printf("Unknown command '%s' - try 'help' or use "
+					"'run' command\n", child->argv[i]);
+			return -1;
+		}
+		/* Process the command */
+		return cmd_process(flag, child->argc, child->argv,
+				   &flag_repeat, NULL);
+#endif
+	}
+#ifndef __U_BOOT__
+
+	for (i = 0; i < pi->num_progs; i++) {
+		child = & (pi->progs[i]);
+
+		/* pipes are inserted between pairs of commands */
+		if ((i + 1) < pi->num_progs) {
+			if (pipe(pipefds)<0) perror_msg_and_die("pipe");
+			nextout = pipefds[1];
+		} else {
+			nextout=1;
+			pipefds[0] = -1;
+		}
+
+		/* XXX test for failed fork()? */
+		if (!(child->pid = fork())) {
+			/* Set the handling for job control signals back to the default.  */
+			signal(SIGINT, SIG_DFL);
+			signal(SIGQUIT, SIG_DFL);
+			signal(SIGTERM, SIG_DFL);
+			signal(SIGTSTP, SIG_DFL);
+			signal(SIGTTIN, SIG_DFL);
+			signal(SIGTTOU, SIG_DFL);
+			signal(SIGCHLD, SIG_DFL);
+
+			close_all();
+
+			if (nextin != 0) {
+				dup2(nextin, 0);
+				close(nextin);
+			}
+			if (nextout != 1) {
+				dup2(nextout, 1);
+				close(nextout);
+			}
+			if (pipefds[0]!=-1) {
+				close(pipefds[0]);  /* opposite end of our output pipe */
+			}
+
+			/* Like bash, explicit redirects override pipes,
+			 * and the pipe fd is available for dup'ing. */
+			setup_redirects(child,NULL);
+
+			if (interactive && pi->followup!=PIPE_BG) {
+				/* If we (the child) win the race, put ourselves in the process
+				 * group whose leader is the first process in this pipe. */
+				if (pi->pgrp < 0) {
+					pi->pgrp = getpid();
+				}
+				if (setpgid(0, pi->pgrp) == 0) {
+					tcsetpgrp(2, pi->pgrp);
+				}
+			}
+
+			pseudo_exec(child);
+		}
+
+
+		/* put our child in the process group whose leader is the
+		   first process in this pipe */
+		if (pi->pgrp < 0) {
+			pi->pgrp = child->pid;
+		}
+		/* Don't check for errors.  The child may be dead already,
+		 * in which case setpgid returns error code EACCES. */
+		setpgid(child->pid, pi->pgrp);
+
+		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];
+	}
+#endif
+	return -1;
+}
+
+static int run_list_real(struct pipe *pi)
+{
+	char *save_name = NULL;
+	char **list = NULL;
+	char **save_list = NULL;
+	struct pipe *rpipe;
+	int flag_rep = 0;
+#ifndef __U_BOOT__
+	int save_num_progs;
+#endif
+	int rcode=0, flag_skip=1;
+	int flag_restore = 0;
+	int if_code=0, next_if_code=0;  /* need double-buffer to handle elif */
+	reserved_style rmode, skip_more_in_this_rmode=RES_XXXX;
+	/* check syntax for "for" */
+	for (rpipe = pi; rpipe; rpipe = rpipe->next) {
+		if ((rpipe->r_mode == RES_IN ||
+		    rpipe->r_mode == RES_FOR) &&
+		    (rpipe->next == NULL)) {
+				syntax();
+#ifdef __U_BOOT__
+				flag_repeat = 0;
+#endif
+				return 1;
+		}
+		if ((rpipe->r_mode == RES_IN &&
+			(rpipe->next->r_mode == RES_IN &&
+			rpipe->next->progs->argv != NULL))||
+			(rpipe->r_mode == RES_FOR &&
+			rpipe->next->r_mode != RES_IN)) {
+				syntax();
+#ifdef __U_BOOT__
+				flag_repeat = 0;
+#endif
+				return 1;
+		}
+	}
+	for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) {
+		if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL ||
+			pi->r_mode == RES_FOR) {
+#ifdef __U_BOOT__
+				/* check Ctrl-C */
+				ctrlc();
+				if ((had_ctrlc())) {
+					return 1;
+				}
+#endif
+				flag_restore = 0;
+				if (!rpipe) {
+					flag_rep = 0;
+					rpipe = pi;
+				}
+		}
+		rmode = pi->r_mode;
+		debug_printf("rmode=%d  if_code=%d  next_if_code=%d skip_more=%d\n", rmode, if_code, next_if_code, skip_more_in_this_rmode);
+		if (rmode == skip_more_in_this_rmode && flag_skip) {
+			if (pi->followup == PIPE_SEQ) flag_skip=0;
+			continue;
+		}
+		flag_skip = 1;
+		skip_more_in_this_rmode = RES_XXXX;
+		if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code;
+		if (rmode == RES_THEN &&  if_code) continue;
+		if (rmode == RES_ELSE && !if_code) continue;
+		if (rmode == RES_ELIF && !if_code) break;
+		if (rmode == RES_FOR && pi->num_progs) {
+			if (!list) {
+				/* if no variable values after "in" we skip "for" */
+				if (!pi->next->progs->argv) continue;
+				/* create list of variable values */
+				list = make_list_in(pi->next->progs->argv,
+					pi->progs->argv[0]);
+				save_list = list;
+				save_name = pi->progs->argv[0];
+				pi->progs->argv[0] = NULL;
+				flag_rep = 1;
+			}
+			if (!(*list)) {
+				free(pi->progs->argv[0]);
+				free(save_list);
+				list = NULL;
+				flag_rep = 0;
+				pi->progs->argv[0] = save_name;
+#ifndef __U_BOOT__
+				pi->progs->glob_result.gl_pathv[0] =
+					pi->progs->argv[0];
+#endif
+				continue;
+			} else {
+				/* insert new value from list for variable */
+				if (pi->progs->argv[0])
+					free(pi->progs->argv[0]);
+				pi->progs->argv[0] = *list++;
+#ifndef __U_BOOT__
+				pi->progs->glob_result.gl_pathv[0] =
+					pi->progs->argv[0];
+#endif
+			}
+		}
+		if (rmode == RES_IN) continue;
+		if (rmode == RES_DO) {
+			if (!flag_rep) continue;
+		}
+		if ((rmode == RES_DONE)) {
+			if (flag_rep) {
+				flag_restore = 1;
+			} else {
+				rpipe = NULL;
+			}
+		}
+		if (pi->num_progs == 0) continue;
+#ifndef __U_BOOT__
+		save_num_progs = pi->num_progs; /* save number of programs */
+#endif
+		rcode = run_pipe_real(pi);
+		debug_printf("run_pipe_real returned %d\n",rcode);
+#ifndef __U_BOOT__
+		if (rcode!=-1) {
+			/* We only ran a builtin: rcode was set by the return value
+			 * of run_pipe_real(), and we don't need to wait for anything. */
+		} else if (pi->followup==PIPE_BG) {
+			/* XXX check bash's behavior with nontrivial pipes */
+			/* XXX compute jobid */
+			/* XXX what does bash do with attempts to background builtins? */
+			insert_bg_job(pi);
+			rcode = EXIT_SUCCESS;
+		} else {
+			if (interactive) {
+				/* move the new process group into the foreground */
+				if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY)
+					perror_msg("tcsetpgrp-3");
+				rcode = checkjobs(pi);
+				/* move the shell to the foreground */
+				if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY)
+					perror_msg("tcsetpgrp-4");
+			} else {
+				rcode = checkjobs(pi);
+			}
+			debug_printf("checkjobs returned %d\n",rcode);
+		}
+		last_return_code=rcode;
+#else
+		if (rcode < -1) {
+			last_return_code = -rcode - 2;
+			return -2;	/* exit */
+		}
+		last_return_code=(rcode == 0) ? 0 : 1;
+#endif
+#ifndef __U_BOOT__
+		pi->num_progs = save_num_progs; /* restore number of programs */
+#endif
+		if ( rmode == RES_IF || rmode == RES_ELIF )
+			next_if_code=rcode;  /* can be overwritten a number of times */
+		if (rmode == RES_WHILE)
+			flag_rep = !last_return_code;
+		if (rmode == RES_UNTIL)
+			flag_rep = last_return_code;
+		if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) ||
+		     (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) )
+			skip_more_in_this_rmode=rmode;
+#ifndef __U_BOOT__
+		checkjobs(NULL);
+#endif
+	}
+	return rcode;
+}
+
+/* broken, of course, but OK for testing */
+static char *indenter(int i)
+{
+	static char blanks[]="                                    ";
+	return &blanks[sizeof(blanks)-i-1];
+}
+
+/* return code is the exit status of the pipe */
+static int free_pipe(struct pipe *pi, int indent)
+{
+	char **p;
+	struct child_prog *child;
+#ifndef __U_BOOT__
+	struct redir_struct *r, *rnext;
+#endif
+	int a, i, ret_code=0;
+	char *ind = indenter(indent);
+
+#ifndef __U_BOOT__
+	if (pi->stopped_progs > 0)
+		return ret_code;
+	final_printf("%s run pipe: (pid %d)\n",ind,getpid());
+#endif
+	for (i=0; i<pi->num_progs; i++) {
+		child = &pi->progs[i];
+		final_printf("%s  command %d:\n",ind,i);
+		if (child->argv) {
+			for (a=0,p=child->argv; *p; a++,p++) {
+				final_printf("%s   argv[%d] = %s\n",ind,a,*p);
+			}
+#ifndef __U_BOOT__
+			globfree(&child->glob_result);
+#else
+			for (a = 0; a < child->argc; a++) {
+				free(child->argv[a]);
+			}
+			free(child->argv);
+			free(child->argv_nonnull);
+			child->argc = 0;
+#endif
+			child->argv=NULL;
+		} else if (child->group) {
+#ifndef __U_BOOT__
+			final_printf("%s   begin group (subshell:%d)\n",ind, child->subshell);
+#endif
+			ret_code = free_pipe_list(child->group,indent+3);
+			final_printf("%s   end group\n",ind);
+		} else {
+			final_printf("%s   (nil)\n",ind);
+		}
+#ifndef __U_BOOT__
+		for (r=child->redirects; r; r=rnext) {
+			final_printf("%s   redirect %d%s", ind, r->fd, redir_table[r->type].descrip);
+			if (r->dup == -1) {
+				/* guard against the case >$FOO, where foo is unset or blank */
+				if (r->word.gl_pathv) {
+					final_printf(" %s\n", *r->word.gl_pathv);
+					globfree(&r->word);
+				}
+			} else {
+				final_printf("&%d\n", r->dup);
+			}
+			rnext=r->next;
+			free(r);
+		}
+		child->redirects=NULL;
+#endif
+	}
+	free(pi->progs);   /* children are an array, they get freed all at once */
+	pi->progs=NULL;
+	return ret_code;
+}
+
+static int free_pipe_list(struct pipe *head, int indent)
+{
+	int rcode=0;   /* if list has no members */
+	struct pipe *pi, *next;
+	char *ind = indenter(indent);
+	for (pi=head; pi; pi=next) {
+		final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode);
+		rcode = free_pipe(pi, indent);
+		final_printf("%s pipe followup code %d\n", ind, pi->followup);
+		next=pi->next;
+		pi->next=NULL;
+		free(pi);
+	}
+	return rcode;
+}
+
+/* Select which version we will use */
+static int run_list(struct pipe *pi)
+{
+	int rcode=0;
+#ifndef __U_BOOT__
+	if (fake_mode==0) {
+#endif
+		rcode = run_list_real(pi);
+#ifndef __U_BOOT__
+	}
+#endif
+	/* free_pipe_list has the side effect of clearing memory
+	 * In the long run that function can be merged with run_list_real,
+	 * but doing that now would hobble the debugging effort. */
+	free_pipe_list(pi,0);
+	return rcode;
+}
+
+/* The API for glob is arguably broken.  This routine pushes a non-matching
+ * string into the output structure, removing non-backslashed backslashes.
+ * If someone can prove me wrong, by performing this function within the
+ * original glob(3) api, feel free to rewrite this routine into oblivion.
+ * Return code (0 vs. GLOB_NOSPACE) matches glob(3).
+ * XXX broken if the last character is '\\', check that before calling.
+ */
+#ifndef __U_BOOT__
+static int globhack(const char *src, int flags, glob_t *pglob)
+{
+	int cnt=0, pathc;
+	const char *s;
+	char *dest;
+	for (cnt=1, s=src; s && *s; s++) {
+		if (*s == '\\') s++;
+		cnt++;
+	}
+	dest = malloc(cnt);
+	if (!dest) return GLOB_NOSPACE;
+	if (!(flags & GLOB_APPEND)) {
+		pglob->gl_pathv=NULL;
+		pglob->gl_pathc=0;
+		pglob->gl_offs=0;
+		pglob->gl_offs=0;
+	}
+	pathc = ++pglob->gl_pathc;
+	pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv));
+	if (pglob->gl_pathv == NULL) return GLOB_NOSPACE;
+	pglob->gl_pathv[pathc-1]=dest;
+	pglob->gl_pathv[pathc]=NULL;
+	for (s=src; s && *s; s++, dest++) {
+		if (*s == '\\') s++;
+		*dest = *s;
+	}
+	*dest='\0';
+	return 0;
+}
+
+/* XXX broken if the last character is '\\', check that before calling */
+static int glob_needed(const char *s)
+{
+	for (; *s; s++) {
+		if (*s == '\\') s++;
+		if (strchr("*[?",*s)) return 1;
+	}
+	return 0;
+}
+
+#if 0
+static void globprint(glob_t *pglob)
+{
+	int i;
+	debug_printf("glob_t at %p:\n", pglob);
+	debug_printf("  gl_pathc=%d  gl_pathv=%p  gl_offs=%d  gl_flags=%d\n",
+		pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags);
+	for (i=0; i<pglob->gl_pathc; i++)
+		debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i,
+			pglob->gl_pathv[i], pglob->gl_pathv[i]);
+}
+#endif
+
+static int xglob(o_string *dest, int flags, glob_t *pglob)
+{
+	int gr;
+
+	/* short-circuit for null word */
+	/* we can code this better when the debug_printf's are gone */
+	if (dest->length == 0) {
+		if (dest->nonnull) {
+			/* bash man page calls this an "explicit" null */
+			gr = globhack(dest->data, flags, pglob);
+			debug_printf("globhack returned %d\n",gr);
+		} else {
+			return 0;
+		}
+	} else if (glob_needed(dest->data)) {
+		gr = glob(dest->data, flags, NULL, pglob);
+		debug_printf("glob returned %d\n",gr);
+		if (gr == GLOB_NOMATCH) {
+			/* quote removal, or more accurately, backslash removal */
+			gr = globhack(dest->data, flags, pglob);
+			debug_printf("globhack returned %d\n",gr);
+		}
+	} else {
+		gr = globhack(dest->data, flags, pglob);
+		debug_printf("globhack returned %d\n",gr);
+	}
+	if (gr == GLOB_NOSPACE)
+		error_msg_and_die("out of memory during glob");
+	if (gr != 0) { /* GLOB_ABORTED ? */
+		error_msg("glob(3) error %d",gr);
+	}
+	/* globprint(glob_target); */
+	return gr;
+}
+#endif
+
+#ifdef __U_BOOT__
+static char *get_dollar_var(char ch);
+#endif
+
+/* This is used to get/check local shell variables */
+char *get_local_var(const char *s)
+{
+	struct variables *cur;
+
+	if (!s)
+		return NULL;
+
+#ifdef __U_BOOT__
+	if (*s == '$')
+		return get_dollar_var(s[1]);
+#endif
+
+	for (cur = top_vars; cur; cur=cur->next)
+		if(strcmp(cur->name, s)==0)
+			return cur->value;
+	return NULL;
+}
+
+/* This is used to set local shell variables
+   flg_export==0 if only local (not exporting) variable
+   flg_export==1 if "new" exporting environ
+   flg_export>1  if current startup environ (not call putenv()) */
+int set_local_var(const char *s, int flg_export)
+{
+	char *name, *value;
+	int result=0;
+	struct variables *cur;
+
+#ifdef __U_BOOT__
+	/* might be possible! */
+	if (!isalpha(*s))
+		return -1;
+#endif
+
+	name=strdup(s);
+
+#ifdef __U_BOOT__
+	if (getenv(name) != NULL) {
+		printf ("ERROR: "
+				"There is a global environment variable with the same name.\n");
+		free(name);
+		return -1;
+	}
+#endif
+	/* Assume when we enter this function that we are already in
+	 * NAME=VALUE format.  So the first order of business is to
+	 * split 's' on the '=' into 'name' and 'value' */
+	value = strchr(name, '=');
+	if (value == NULL && ++value == NULL) {
+		free(name);
+		return -1;
+	}
+	*value++ = 0;
+
+	for(cur = top_vars; cur; cur = cur->next) {
+		if(strcmp(cur->name, name)==0)
+			break;
+	}
+
+	if(cur) {
+		if(strcmp(cur->value, value)==0) {
+			if(flg_export>0 && cur->flg_export==0)
+				cur->flg_export=flg_export;
+			else
+				result++;
+		} else {
+			if(cur->flg_read_only) {
+				error_msg("%s: readonly variable", name);
+				result = -1;
+			} else {
+				if(flg_export>0 || cur->flg_export>1)
+					cur->flg_export=1;
+				free(cur->value);
+
+				cur->value = strdup(value);
+			}
+		}
+	} else {
+		cur = malloc(sizeof(struct variables));
+		if(!cur) {
+			result = -1;
+		} else {
+			cur->name = strdup(name);
+			if (cur->name == NULL) {
+				free(cur);
+				result = -1;
+			} else {
+				struct variables *bottom = top_vars;
+				cur->value = strdup(value);
+				cur->next = NULL;
+				cur->flg_export = flg_export;
+				cur->flg_read_only = 0;
+				while(bottom->next) bottom=bottom->next;
+				bottom->next = cur;
+			}
+		}
+	}
+
+#ifndef __U_BOOT__
+	if(result==0 && cur->flg_export==1) {
+		*(value-1) = '=';
+		result = putenv(name);
+	} else {
+#endif
+		free(name);
+#ifndef __U_BOOT__
+		if(result>0)            /* equivalent to previous set */
+			result = 0;
+	}
+#endif
+	return result;
+}
+
+void unset_local_var(const char *name)
+{
+	struct variables *cur;
+
+	if (name) {
+		for (cur = top_vars; cur; cur=cur->next) {
+			if(strcmp(cur->name, name)==0)
+				break;
+		}
+		if (cur != NULL) {
+			struct variables *next = top_vars;
+			if(cur->flg_read_only) {
+				error_msg("%s: readonly variable", name);
+				return;
+			} else {
+#ifndef __U_BOOT__
+				if(cur->flg_export)
+					unsetenv(cur->name);
+#endif
+				free(cur->name);
+				free(cur->value);
+				while (next->next != cur)
+					next = next->next;
+				next->next = cur->next;
+			}
+			free(cur);
+		}
+	}
+}
+
+static int is_assignment(const char *s)
+{
+	if (s == NULL)
+		return 0;
+
+	if (!isalpha(*s)) return 0;
+	++s;
+	while(isalnum(*s) || *s=='_') ++s;
+	return *s=='=';
+}
+
+#ifndef __U_BOOT__
+/* the src parameter allows us to peek forward to a possible &n syntax
+ * for file descriptor duplication, e.g., "2>&1".
+ * Return code is 0 normally, 1 if a syntax error is detected in src.
+ * Resource errors (in xmalloc) cause the process to exit */
+static int setup_redirect(struct p_context *ctx, int fd, redir_type style,
+	struct in_str *input)
+{
+	struct child_prog *child=ctx->child;
+	struct redir_struct *redir = child->redirects;
+	struct redir_struct *last_redir=NULL;
+
+	/* Create a new redir_struct and drop it onto the end of the linked list */
+	while(redir) {
+		last_redir=redir;
+		redir=redir->next;
+	}
+	redir = xmalloc(sizeof(struct redir_struct));
+	redir->next=NULL;
+	redir->word.gl_pathv=NULL;
+	if (last_redir) {
+		last_redir->next=redir;
+	} else {
+		child->redirects=redir;
+	}
+
+	redir->type=style;
+	redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ;
+
+	debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
+
+	/* Check for a '2>&1' type redirect */
+	redir->dup = redirect_dup_num(input);
+	if (redir->dup == -2) return 1;  /* syntax error */
+	if (redir->dup != -1) {
+		/* Erik had a check here that the file descriptor in question
+		 * is legit; I postpone that to "run time"
+		 * A "-" representation of "close me" shows up as a -3 here */
+		debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
+	} else {
+		/* We do _not_ try to open the file that src points to,
+		 * since we need to return and let src be expanded first.
+		 * Set ctx->pending_redirect, so we know what to do at the
+		 * end of the next parsed word.
+		 */
+		ctx->pending_redirect = redir;
+	}
+	return 0;
+}
+#endif
+
+static struct pipe *new_pipe(void)
+{
+	struct pipe *pi;
+	pi = xmalloc(sizeof(struct pipe));
+	pi->num_progs = 0;
+	pi->progs = NULL;
+	pi->next = NULL;
+	pi->followup = 0;  /* invalid */
+	pi->r_mode = RES_NONE;
+	return pi;
+}
+
+static void initialize_context(struct p_context *ctx)
+{
+	ctx->pipe=NULL;
+#ifndef __U_BOOT__
+	ctx->pending_redirect=NULL;
+#endif
+	ctx->child=NULL;
+	ctx->list_head=new_pipe();
+	ctx->pipe=ctx->list_head;
+	ctx->w=RES_NONE;
+	ctx->stack=NULL;
+#ifdef __U_BOOT__
+	ctx->old_flag=0;
+#endif
+	done_command(ctx);   /* creates the memory for working child */
+}
+
+/* normal return is 0
+ * if a reserved word is found, and processed, return 1
+ * should handle if, then, elif, else, fi, for, while, until, do, done.
+ * case, function, and select are obnoxious, save those for later.
+ */
+struct reserved_combo {
+	char *literal;
+	int code;
+	long flag;
+};
+/* Mostly a list of accepted follow-up reserved words.
+ * FLAG_END means we are done with the sequence, and are ready
+ * to turn the compound list into a command.
+ * FLAG_START means the word must start a new compound list.
+ */
+static struct reserved_combo reserved_list[] = {
+	{ "if",    RES_IF,    FLAG_THEN | FLAG_START },
+	{ "then",  RES_THEN,  FLAG_ELIF | FLAG_ELSE | FLAG_FI },
+	{ "elif",  RES_ELIF,  FLAG_THEN },
+	{ "else",  RES_ELSE,  FLAG_FI   },
+	{ "fi",    RES_FI,    FLAG_END  },
+	{ "for",   RES_FOR,   FLAG_IN   | FLAG_START },
+	{ "while", RES_WHILE, FLAG_DO   | FLAG_START },
+	{ "until", RES_UNTIL, FLAG_DO   | FLAG_START },
+	{ "in",    RES_IN,    FLAG_DO   },
+	{ "do",    RES_DO,    FLAG_DONE },
+	{ "done",  RES_DONE,  FLAG_END  }
+};
+#define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo))
+
+static int reserved_word(o_string *dest, struct p_context *ctx)
+{
+	struct reserved_combo *r;
+	for (r=reserved_list;
+		r<reserved_list+NRES; r++) {
+		if (strcmp(dest->data, r->literal) == 0) {
+			debug_printf("found reserved word %s, code %d\n",r->literal,r->code);
+			if (r->flag & FLAG_START) {
+				struct p_context *new = xmalloc(sizeof(struct p_context));
+				debug_printf("push stack\n");
+				if (ctx->w == RES_IN || ctx->w == RES_FOR) {
+					syntax();
+					free(new);
+					ctx->w = RES_SNTX;
+					b_reset(dest);
+					return 1;
+				}
+				*new = *ctx;   /* physical copy */
+				initialize_context(ctx);
+				ctx->stack=new;
+			} else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) {
+				syntax();
+				ctx->w = RES_SNTX;
+				b_reset(dest);
+				return 1;
+			}
+			ctx->w=r->code;
+			ctx->old_flag = r->flag;
+			if (ctx->old_flag & FLAG_END) {
+				struct p_context *old;
+				debug_printf("pop stack\n");
+				done_pipe(ctx,PIPE_SEQ);
+				old = ctx->stack;
+				old->child->group = ctx->list_head;
+#ifndef __U_BOOT__
+				old->child->subshell = 0;
+#endif
+				*ctx = *old;   /* physical copy */
+				free(old);
+			}
+			b_reset (dest);
+			return 1;
+		}
+	}
+	return 0;
+}
+
+/* normal return is 0.
+ * Syntax or xglob errors return 1. */
+static int done_word(o_string *dest, struct p_context *ctx)
+{
+	struct child_prog *child=ctx->child;
+#ifndef __U_BOOT__
+	glob_t *glob_target;
+	int gr, flags = 0;
+#else
+	char *str, *s;
+	int argc, cnt;
+#endif
+
+	debug_printf("done_word: %s %p\n", dest->data, child);
+	if (dest->length == 0 && !dest->nonnull) {
+		debug_printf("  true null, ignored\n");
+		return 0;
+	}
+#ifndef __U_BOOT__
+	if (ctx->pending_redirect) {
+		glob_target = &ctx->pending_redirect->word;
+	} else {
+#endif
+		if (child->group) {
+			syntax();
+			return 1;  /* syntax error, groups and arglists don't mix */
+		}
+		if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) {
+			debug_printf("checking %s for reserved-ness\n",dest->data);
+			if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX;
+		}
+#ifndef __U_BOOT__
+		glob_target = &child->glob_result;
+		if (child->argv) flags |= GLOB_APPEND;
+#else
+		for (cnt = 1, s = dest->data; s && *s; s++) {
+			if (*s == '\\') s++;
+			cnt++;
+		}
+		str = malloc(cnt);
+		if (!str) return 1;
+		if ( child->argv == NULL) {
+			child->argc=0;
+		}
+		argc = ++child->argc;
+		child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv));
+		if (child->argv == NULL) return 1;
+		child->argv_nonnull = realloc(child->argv_nonnull,
+					(argc+1)*sizeof(*child->argv_nonnull));
+		if (child->argv_nonnull == NULL)
+			return 1;
+		child->argv[argc-1]=str;
+		child->argv_nonnull[argc-1] = dest->nonnull;
+		child->argv[argc]=NULL;
+		child->argv_nonnull[argc] = 0;
+		for (s = dest->data; s && *s; s++,str++) {
+			if (*s == '\\') s++;
+			*str = *s;
+		}
+		*str = '\0';
+#endif
+#ifndef __U_BOOT__
+	}
+	gr = xglob(dest, flags, glob_target);
+	if (gr != 0) return 1;
+#endif
+
+	b_reset(dest);
+#ifndef __U_BOOT__
+	if (ctx->pending_redirect) {
+		ctx->pending_redirect=NULL;
+		if (glob_target->gl_pathc != 1) {
+			error_msg("ambiguous redirect");
+			return 1;
+		}
+	} else {
+		child->argv = glob_target->gl_pathv;
+	}
+#endif
+	if (ctx->w == RES_FOR) {
+		done_word(dest,ctx);
+		done_pipe(ctx,PIPE_SEQ);
+	}
+	return 0;
+}
+
+/* The only possible error here is out of memory, in which case
+ * xmalloc exits. */
+static int done_command(struct p_context *ctx)
+{
+	/* The child is really already in the pipe structure, so
+	 * advance the pipe counter and make a new, null child.
+	 * Only real trickiness here is that the uncommitted
+	 * child structure, to which ctx->child points, is not
+	 * counted in pi->num_progs. */
+	struct pipe *pi=ctx->pipe;
+	struct child_prog *prog=ctx->child;
+
+	if (prog && prog->group == NULL
+		 && prog->argv == NULL
+#ifndef __U_BOOT__
+		 && prog->redirects == NULL) {
+#else
+										) {
+#endif
+		debug_printf("done_command: skipping null command\n");
+		return 0;
+	} else if (prog) {
+		pi->num_progs++;
+		debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs);
+	} else {
+		debug_printf("done_command: initializing\n");
+	}
+	pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1));
+
+	prog = pi->progs + pi->num_progs;
+#ifndef __U_BOOT__
+	prog->redirects = NULL;
+#endif
+	prog->argv = NULL;
+	prog->argv_nonnull = NULL;
+#ifndef __U_BOOT__
+	prog->is_stopped = 0;
+#endif
+	prog->group = NULL;
+#ifndef __U_BOOT__
+	prog->glob_result.gl_pathv = NULL;
+	prog->family = pi;
+#endif
+	prog->sp = 0;
+	ctx->child = prog;
+	prog->type = ctx->type;
+
+	/* but ctx->pipe and ctx->list_head remain unchanged */
+	return 0;
+}
+
+static int done_pipe(struct p_context *ctx, pipe_style type)
+{
+	struct pipe *new_p;
+	done_command(ctx);  /* implicit closure of previous command */
+	debug_printf("done_pipe, type %d\n", type);
+	ctx->pipe->followup = type;
+	ctx->pipe->r_mode = ctx->w;
+	new_p=new_pipe();
+	ctx->pipe->next = new_p;
+	ctx->pipe = new_p;
+	ctx->child = NULL;
+	done_command(ctx);  /* set up new pipe to accept commands */
+	return 0;
+}
+
+#ifndef __U_BOOT__
+/* peek ahead in the in_str to find out if we have a "&n" construct,
+ * as in "2>&1", that represents duplicating a file descriptor.
+ * returns either -2 (syntax error), -1 (no &), or the number found.
+ */
+static int redirect_dup_num(struct in_str *input)
+{
+	int ch, d=0, ok=0;
+	ch = b_peek(input);
+	if (ch != '&') return -1;
+
+	b_getch(input);  /* get the & */
+	ch=b_peek(input);
+	if (ch == '-') {
+		b_getch(input);
+		return -3;  /* "-" represents "close me" */
+	}
+	while (isdigit(ch)) {
+		d = d*10+(ch-'0');
+		ok=1;
+		b_getch(input);
+		ch = b_peek(input);
+	}
+	if (ok) return d;
+
+	error_msg("ambiguous redirect");
+	return -2;
+}
+
+/* If a redirect is immediately preceded by a number, that number is
+ * supposed to tell which file descriptor to redirect.  This routine
+ * looks for such preceding numbers.  In an ideal world this routine
+ * needs to handle all the following classes of redirects...
+ *     echo 2>foo     # redirects fd  2 to file "foo", nothing passed to echo
+ *     echo 49>foo    # redirects fd 49 to file "foo", nothing passed to echo
+ *     echo -2>foo    # redirects fd  1 to file "foo",    "-2" passed to echo
+ *     echo 49x>foo   # redirects fd  1 to file "foo",   "49x" passed to echo
+ * A -1 output from this program means no valid number was found, so the
+ * caller should use the appropriate default for this redirection.
+ */
+static int redirect_opt_num(o_string *o)
+{
+	int num;
+
+	if (o->length==0) return -1;
+	for(num=0; num<o->length; num++) {
+		if (!isdigit(*(o->data+num))) {
+			return -1;
+		}
+	}
+	/* reuse num (and save an int) */
+	num=atoi(o->data);
+	b_reset(o);
+	return num;
+}
+
+FILE *generate_stream_from_list(struct pipe *head)
+{
+	FILE *pf;
+#if 1
+	int pid, channel[2];
+	if (pipe(channel)<0) perror_msg_and_die("pipe");
+	pid=fork();
+	if (pid<0) {
+		perror_msg_and_die("fork");
+	} else if (pid==0) {
+		close(channel[0]);
+		if (channel[1] != 1) {
+			dup2(channel[1],1);
+			close(channel[1]);
+		}
+#if 0
+#define SURROGATE "surrogate response"
+		write(1,SURROGATE,sizeof(SURROGATE));
+		_exit(run_list(head));
+#else
+		_exit(run_list_real(head));   /* leaks memory */
+#endif
+	}
+	debug_printf("forked child %d\n",pid);
+	close(channel[1]);
+	pf = fdopen(channel[0],"r");
+	debug_printf("pipe on FILE *%p\n",pf);
+#else
+	free_pipe_list(head,0);
+	pf=popen("echo surrogate response","r");
+	debug_printf("started fake pipe on FILE *%p\n",pf);
+#endif
+	return pf;
+}
+
+/* this version hacked for testing purposes */
+/* return code is exit status of the process that is run. */
+static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end)
+{
+	int retcode;
+	o_string result=NULL_O_STRING;
+	struct p_context inner;
+	FILE *p;
+	struct in_str pipe_str;
+	initialize_context(&inner);
+
+	/* recursion to generate command */
+	retcode = parse_stream(&result, &inner, input, subst_end);
+	if (retcode != 0) return retcode;  /* syntax error or EOF */
+	done_word(&result, &inner);
+	done_pipe(&inner, PIPE_SEQ);
+	b_free(&result);
+
+	p=generate_stream_from_list(inner.list_head);
+	if (p==NULL) return 1;
+	mark_open(fileno(p));
+	setup_file_in_str(&pipe_str, p);
+
+	/* now send results of command back into original context */
+	retcode = parse_stream(dest, ctx, &pipe_str, '\0');
+	/* XXX In case of a syntax error, should we try to kill the child?
+	 * That would be tough to do right, so just read until EOF. */
+	if (retcode == 1) {
+		while (b_getch(&pipe_str)!=EOF) { /* discard */ };
+	}
+
+	debug_printf("done reading from pipe, pclose()ing\n");
+	/* This is the step that wait()s for the child.  Should be pretty
+	 * safe, since we just read an EOF from its stdout.  We could try
+	 * to better, by using wait(), and keeping track of background jobs
+	 * at the same time.  That would be a lot of work, and contrary
+	 * to the KISS philosophy of this program. */
+	mark_closed(fileno(p));
+	retcode=pclose(p);
+	free_pipe_list(inner.list_head,0);
+	debug_printf("pclosed, retcode=%d\n",retcode);
+	/* XXX this process fails to trim a single trailing newline */
+	return retcode;
+}
+
+static int parse_group(o_string *dest, struct p_context *ctx,
+	struct in_str *input, int ch)
+{
+	int rcode, endch=0;
+	struct p_context sub;
+	struct child_prog *child = ctx->child;
+	if (child->argv) {
+		syntax();
+		return 1;  /* syntax error, groups and arglists don't mix */
+	}
+	initialize_context(&sub);
+	switch(ch) {
+		case '(': endch=')'; child->subshell=1; break;
+		case '{': endch='}'; break;
+		default: syntax();   /* really logic error */
+	}
+	rcode=parse_stream(dest,&sub,input,endch);
+	done_word(dest,&sub); /* finish off the final word in the subcontext */
+	done_pipe(&sub, PIPE_SEQ);  /* and the final command there, too */
+	child->group = sub.list_head;
+	return rcode;
+	/* child remains "open", available for possible redirects */
+}
+#endif
+
+/* basically useful version until someone wants to get fancier,
+ * see the bash man page under "Parameter Expansion" */
+static char *lookup_param(char *src)
+{
+	char *p;
+	char *sep;
+	char *default_val = NULL;
+	int assign = 0;
+	int expand_empty = 0;
+
+	if (!src)
+		return NULL;
+
+	sep = strchr(src, ':');
+
+	if (sep) {
+		*sep = '\0';
+		if (*(sep + 1) == '-')
+			default_val = sep+2;
+		if (*(sep + 1) == '=') {
+			default_val = sep+2;
+			assign = 1;
+		}
+		if (*(sep + 1) == '+') {
+			default_val = sep+2;
+			expand_empty = 1;
+		}
+	}
+
+	p = getenv(src);
+	if (!p)
+		p = get_local_var(src);
+
+	if (!p || strlen(p) == 0) {
+		p = default_val;
+		if (assign) {
+			char *var = malloc(strlen(src)+strlen(default_val)+2);
+			if (var) {
+				sprintf(var, "%s=%s", src, default_val);
+				set_local_var(var, 0);
+			}
+			free(var);
+		}
+	} else if (expand_empty) {
+		p += strlen(p);
+	}
+
+	if (sep)
+		*sep = ':';
+
+	return p;
+}
+
+#ifdef __U_BOOT__
+static char *get_dollar_var(char ch)
+{
+	static char buf[40];
+
+	buf[0] = '\0';
+	switch (ch) {
+		case '?':
+			sprintf(buf, "%u", (unsigned int)last_return_code);
+			break;
+		default:
+			return NULL;
+	}
+	return buf;
+}
+#endif
+
+/* return code: 0 for OK, 1 for syntax error */
+static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input)
+{
+#ifndef __U_BOOT__
+	int i, advance=0;
+#else
+	int advance=0;
+#endif
+#ifndef __U_BOOT__
+	char sep[]=" ";
+#endif
+	int ch = input->peek(input);  /* first character after the $ */
+	debug_printf("handle_dollar: ch=%c\n",ch);
+	if (isalpha(ch)) {
+		b_addchr(dest, SPECIAL_VAR_SYMBOL);
+		ctx->child->sp++;
+		while(ch=b_peek(input),isalnum(ch) || ch=='_') {
+			b_getch(input);
+			b_addchr(dest,ch);
+		}
+		b_addchr(dest, SPECIAL_VAR_SYMBOL);
+#ifndef __U_BOOT__
+	} else if (isdigit(ch)) {
+		i = ch-'0';  /* XXX is $0 special? */
+		if (i<global_argc) {
+			parse_string(dest, ctx, global_argv[i]); /* recursion */
+		}
+		advance = 1;
+#endif
+	} else switch (ch) {
+#ifndef __U_BOOT__
+		case '$':
+			b_adduint(dest,getpid());
+			advance = 1;
+			break;
+		case '!':
+			if (last_bg_pid > 0) b_adduint(dest, last_bg_pid);
+			advance = 1;
+			break;
+#endif
+		case '?':
+#ifndef __U_BOOT__
+			b_adduint(dest,last_return_code);
+#else
+			ctx->child->sp++;
+			b_addchr(dest, SPECIAL_VAR_SYMBOL);
+			b_addchr(dest, '$');
+			b_addchr(dest, '?');
+			b_addchr(dest, SPECIAL_VAR_SYMBOL);
+#endif
+			advance = 1;
+			break;
+#ifndef __U_BOOT__
+		case '#':
+			b_adduint(dest,global_argc ? global_argc-1 : 0);
+			advance = 1;
+			break;
+#endif
+		case '{':
+			b_addchr(dest, SPECIAL_VAR_SYMBOL);
+			ctx->child->sp++;
+			b_getch(input);
+			/* XXX maybe someone will try to escape the '}' */
+			while(ch=b_getch(input),ch!=EOF && ch!='}') {
+				b_addchr(dest,ch);
+			}
+			if (ch != '}') {
+				syntax();
+				return 1;
+			}
+			b_addchr(dest, SPECIAL_VAR_SYMBOL);
+			break;
+#ifndef __U_BOOT__
+		case '(':
+			b_getch(input);
+			process_command_subs(dest, ctx, input, ')');
+			break;
+		case '*':
+			sep[0]=ifs[0];
+			for (i=1; i<global_argc; i++) {
+				parse_string(dest, ctx, global_argv[i]);
+				if (i+1 < global_argc) parse_string(dest, ctx, sep);
+			}
+			break;
+		case '@':
+		case '-':
+		case '_':
+			/* still unhandled, but should be eventually */
+			error_msg("unhandled syntax: $%c",ch);
+			return 1;
+			break;
+#endif
+		default:
+			b_addqchr(dest,'$',dest->quote);
+	}
+	/* Eat the character if the flag was set.  If the compiler
+	 * is smart enough, we could substitute "b_getch(input);"
+	 * for all the "advance = 1;" above, and also end up with
+	 * a nice size-optimized program.  Hah!  That'll be the day.
+	 */
+	if (advance) b_getch(input);
+	return 0;
+}
+
+#ifndef __U_BOOT__
+int parse_string(o_string *dest, struct p_context *ctx, const char *src)
+{
+	struct in_str foo;
+	setup_string_in_str(&foo, src);
+	return parse_stream(dest, ctx, &foo, '\0');
+}
+#endif
+
+/* return code is 0 for normal exit, 1 for syntax error */
+static int parse_stream(o_string *dest, struct p_context *ctx,
+			struct in_str *input, int end_trigger)
+{
+	unsigned int ch, m;
+#ifndef __U_BOOT__
+	int redir_fd;
+	redir_type redir_style;
+#endif
+	int next;
+
+	/* Only double-quote state is handled in the state variable dest->quote.
+	 * A single-quote triggers a bypass of the main loop until its mate is
+	 * found.  When recursing, quote state is passed in via dest->quote. */
+
+	debug_printf("parse_stream, end_trigger=%d\n",end_trigger);
+	while ((ch=b_getch(input))!=EOF) {
+		m = map[ch];
+#ifdef __U_BOOT__
+		if (input->__promptme == 0) return 1;
+#endif
+		next = (ch == '\n') ? 0 : b_peek(input);
+
+		debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n",
+			ch >= ' ' ? ch : '.', ch, m,
+			dest->quote, ctx->stack == NULL ? '*' : '.');
+
+		if (m==0 || ((m==1 || m==2) && dest->quote)) {
+			b_addqchr(dest, ch, dest->quote);
+		} else {
+			if (m==2) {  /* unquoted IFS */
+				if (done_word(dest, ctx)) {
+					return 1;
+				}
+				/* If we aren't performing a substitution, treat a newline as a
+				 * command separator.  */
+				if (end_trigger != '\0' && ch=='\n')
+					done_pipe(ctx,PIPE_SEQ);
+			}
+			if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) {
+				debug_printf("leaving parse_stream (triggered)\n");
+				return 0;
+			}
+#if 0
+			if (ch=='\n') {
+				/* Yahoo!  Time to run with it! */
+				done_pipe(ctx,PIPE_SEQ);
+				run_list(ctx->list_head);
+				initialize_context(ctx);
+			}
+#endif
+			if (m!=2) switch (ch) {
+		case '#':
+			if (dest->length == 0 && !dest->quote) {
+				while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); }
+			} else {
+				b_addqchr(dest, ch, dest->quote);
+			}
+			break;
+		case '\\':
+			if (next == EOF) {
+				syntax();
+				return 1;
+			}
+			b_addqchr(dest, '\\', dest->quote);
+			b_addqchr(dest, b_getch(input), dest->quote);
+			break;
+		case '$':
+			if (handle_dollar(dest, ctx, input)!=0) return 1;
+			break;
+		case '\'':
+			dest->nonnull = 1;
+			while(ch=b_getch(input),ch!=EOF && ch!='\'') {
+#ifdef __U_BOOT__
+				if(input->__promptme == 0) return 1;
+#endif
+				b_addchr(dest,ch);
+			}
+			if (ch==EOF) {
+				syntax();
+				return 1;
+			}
+			break;
+		case '"':
+			dest->nonnull = 1;
+			dest->quote = !dest->quote;
+			break;
+#ifndef __U_BOOT__
+		case '`':
+			process_command_subs(dest, ctx, input, '`');
+			break;
+		case '>':
+			redir_fd = redirect_opt_num(dest);
+			done_word(dest, ctx);
+			redir_style=REDIRECT_OVERWRITE;
+			if (next == '>') {
+				redir_style=REDIRECT_APPEND;
+				b_getch(input);
+			} else if (next == '(') {
+				syntax();   /* until we support >(list) Process Substitution */
+				return 1;
+			}
+			setup_redirect(ctx, redir_fd, redir_style, input);
+			break;
+		case '<':
+			redir_fd = redirect_opt_num(dest);
+			done_word(dest, ctx);
+			redir_style=REDIRECT_INPUT;
+			if (next == '<') {
+				redir_style=REDIRECT_HEREIS;
+				b_getch(input);
+			} else if (next == '>') {
+				redir_style=REDIRECT_IO;
+				b_getch(input);
+			} else if (next == '(') {
+				syntax();   /* until we support <(list) Process Substitution */
+				return 1;
+			}
+			setup_redirect(ctx, redir_fd, redir_style, input);
+			break;
+#endif
+		case ';':
+			done_word(dest, ctx);
+			done_pipe(ctx,PIPE_SEQ);
+			break;
+		case '&':
+			done_word(dest, ctx);
+			if (next=='&') {
+				b_getch(input);
+				done_pipe(ctx,PIPE_AND);
+			} else {
+#ifndef __U_BOOT__
+				done_pipe(ctx,PIPE_BG);
+#else
+				syntax_err();
+				return 1;
+#endif
+			}
+			break;
+		case '|':
+			done_word(dest, ctx);
+			if (next=='|') {
+				b_getch(input);
+				done_pipe(ctx,PIPE_OR);
+			} else {
+				/* we could pick up a file descriptor choice here
+				 * with redirect_opt_num(), but bash doesn't do it.
+				 * "echo foo 2| cat" yields "foo 2". */
+#ifndef __U_BOOT__
+				done_command(ctx);
+#else
+				syntax_err();
+				return 1;
+#endif
+			}
+			break;
+#ifndef __U_BOOT__
+		case '(':
+		case '{':
+			if (parse_group(dest, ctx, input, ch)!=0) return 1;
+			break;
+		case ')':
+		case '}':
+			syntax();   /* Proper use of this character caught by end_trigger */
+			return 1;
+			break;
+#endif
+		case SUBSTED_VAR_SYMBOL:
+			dest->nonnull = 1;
+			while (ch = b_getch(input), ch != EOF &&
+			    ch != SUBSTED_VAR_SYMBOL) {
+				debug_printf("subst, pass=%d\n", ch);
+				if (input->__promptme == 0)
+					return 1;
+				b_addchr(dest, ch);
+			}
+			debug_printf("subst, term=%d\n", ch);
+			if (ch == EOF) {
+				syntax();
+				return 1;
+			}
+			break;
+		default:
+			syntax();   /* this is really an internal logic error */
+			return 1;
+			}
+		}
+	}
+	/* complain if quote?  No, maybe we just finished a command substitution
+	 * that was quoted.  Example:
+	 * $ echo "`cat foo` plus more"
+	 * and we just got the EOF generated by the subshell that ran "cat foo"
+	 * The only real complaint is if we got an EOF when end_trigger != '\0',
+	 * that is, we were really supposed to get end_trigger, and never got
+	 * one before the EOF.  Can't use the standard "syntax error" return code,
+	 * so that parse_stream_outer can distinguish the EOF and exit smoothly. */
+	debug_printf("leaving parse_stream (EOF)\n");
+	if (end_trigger != '\0') return -1;
+	return 0;
+}
+
+static void mapset(const unsigned char *set, int code)
+{
+	const unsigned char *s;
+	for (s=set; *s; s++) map[*s] = code;
+}
+
+static void update_ifs_map(void)
+{
+	/* char *ifs and char map[256] are both globals. */
+	ifs = (uchar *)getenv("IFS");
+	if (ifs == NULL) ifs=(uchar *)" \t\n";
+	/* Precompute a list of 'flow through' behavior so it can be treated
+	 * quickly up front.  Computation is necessary because of IFS.
+	 * Special case handling of IFS == " \t\n" is not implemented.
+	 * The map[] array only really needs two bits each, and on most machines
+	 * that would be faster because of the reduced L1 cache footprint.
+	 */
+	memset(map,0,sizeof(map)); /* most characters flow through always */
+#ifndef __U_BOOT__
+	mapset((uchar *)"\\$'\"`", 3);      /* never flow through */
+	mapset((uchar *)"<>;&|(){}#", 1);   /* flow through if quoted */
+#else
+	{
+		uchar subst[2] = {SUBSTED_VAR_SYMBOL, 0};
+		mapset(subst, 3);       /* never flow through */
+	}
+	mapset((uchar *)"\\$'\"", 3);       /* never flow through */
+	mapset((uchar *)";&|#", 1);         /* flow through if quoted */
+#endif
+	mapset(ifs, 2);            /* also flow through if quoted */
+}
+
+/* most recursion does not come through here, the exeception is
+ * from builtin_source() */
+static int parse_stream_outer(struct in_str *inp, int flag)
+{
+
+	struct p_context ctx;
+	o_string temp=NULL_O_STRING;
+	int rcode;
+#ifdef __U_BOOT__
+	int code = 0;
+#endif
+	do {
+		ctx.type = flag;
+		initialize_context(&ctx);
+		update_ifs_map();
+		if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0);
+		inp->promptmode=1;
+		rcode = parse_stream(&temp, &ctx, inp, '\n');
+#ifdef __U_BOOT__
+		if (rcode == 1) flag_repeat = 0;
+#endif
+		if (rcode != 1 && ctx.old_flag != 0) {
+			syntax();
+#ifdef __U_BOOT__
+			flag_repeat = 0;
+#endif
+		}
+		if (rcode != 1 && ctx.old_flag == 0) {
+			done_word(&temp, &ctx);
+			done_pipe(&ctx,PIPE_SEQ);
+#ifndef __U_BOOT__
+			run_list(ctx.list_head);
+#else
+			code = run_list(ctx.list_head);
+			if (code == -2) {	/* exit */
+				b_free(&temp);
+				code = 0;
+				/* XXX hackish way to not allow exit from main loop */
+				if (inp->peek == file_peek) {
+					printf("exit not allowed from main input shell.\n");
+					continue;
+				}
+				break;
+			}
+			if (code == -1)
+			    flag_repeat = 0;
+#endif
+		} else {
+			if (ctx.old_flag != 0) {
+				free(ctx.stack);
+				b_reset(&temp);
+			}
+#ifdef __U_BOOT__
+			if (inp->__promptme == 0) printf("<INTERRUPT>\n");
+			inp->__promptme = 1;
+#endif
+			temp.nonnull = 0;
+			temp.quote = 0;
+			inp->p = NULL;
+			free_pipe_list(ctx.list_head,0);
+		}
+		b_free(&temp);
+	} while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP));   /* loop on syntax errors, return on EOF */
+#ifndef __U_BOOT__
+	return 0;
+#else
+	return (code != 0) ? 1 : 0;
+#endif /* __U_BOOT__ */
+}
+
+#ifndef __U_BOOT__
+static int parse_string_outer(const char *s, int flag)
+#else
+int parse_string_outer(const char *s, int flag)
+#endif	/* __U_BOOT__ */
+{
+	struct in_str input;
+#ifdef __U_BOOT__
+	char *p = NULL;
+	int rcode;
+	if ( !s || !*s)
+		return 1;
+	if (!(p = strchr(s, '\n')) || *++p) {
+		p = xmalloc(strlen(s) + 2);
+		strcpy(p, s);
+		strcat(p, "\n");
+		setup_string_in_str(&input, p);
+		rcode = parse_stream_outer(&input, flag);
+		free(p);
+		return rcode;
+	} else {
+#endif
+	setup_string_in_str(&input, s);
+	return parse_stream_outer(&input, flag);
+#ifdef __U_BOOT__
+	}
+#endif
+}
+
+#ifndef __U_BOOT__
+static int parse_file_outer(FILE *f)
+#else
+int parse_file_outer(void)
+#endif
+{
+	int rcode;
+	struct in_str input;
+#ifndef __U_BOOT__
+	setup_file_in_str(&input, f);
+#else
+	setup_file_in_str(&input);
+#endif
+	rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON);
+	return rcode;
+}
+
+#ifdef __U_BOOT__
+#ifdef CONFIG_NEEDS_MANUAL_RELOC
+static void u_boot_hush_reloc(void)
+{
+	unsigned long addr;
+	struct reserved_combo *r;
+
+	for (r=reserved_list; r<reserved_list+NRES; r++) {
+		addr = (ulong) (r->literal) + gd->reloc_off;
+		r->literal = (char *)addr;
+	}
+}
+#endif
+
+int u_boot_hush_start(void)
+{
+	if (top_vars == NULL) {
+		top_vars = malloc(sizeof(struct variables));
+		top_vars->name = "HUSH_VERSION";
+		top_vars->value = "0.01";
+		top_vars->next = NULL;
+		top_vars->flg_export = 0;
+		top_vars->flg_read_only = 1;
+#ifdef CONFIG_NEEDS_MANUAL_RELOC
+		u_boot_hush_reloc();
+#endif
+	}
+	return 0;
+}
+
+static void *xmalloc(size_t size)
+{
+	void *p = NULL;
+
+	if (!(p = malloc(size))) {
+	    printf("ERROR : memory not allocated\n");
+	    for(;;);
+	}
+	return p;
+}
+
+static void *xrealloc(void *ptr, size_t size)
+{
+	void *p = NULL;
+
+	if (!(p = realloc(ptr, size))) {
+	    printf("ERROR : memory not allocated\n");
+	    for(;;);
+	}
+	return p;
+}
+#endif /* __U_BOOT__ */
+
+#ifndef __U_BOOT__
+/* Make sure we have a controlling tty.  If we get started under a job
+ * aware app (like bash for example), make sure we are now in charge so
+ * we don't fight over who gets the foreground */
+static void setup_job_control(void)
+{
+	static pid_t shell_pgrp;
+	/* Loop until we are in the foreground.  */
+	while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ()))
+		kill (- shell_pgrp, SIGTTIN);
+
+	/* Ignore interactive and job-control signals.  */
+	signal(SIGINT, SIG_IGN);
+	signal(SIGQUIT, SIG_IGN);
+	signal(SIGTERM, SIG_IGN);
+	signal(SIGTSTP, SIG_IGN);
+	signal(SIGTTIN, SIG_IGN);
+	signal(SIGTTOU, SIG_IGN);
+	signal(SIGCHLD, SIG_IGN);
+
+	/* Put ourselves in our own process group.  */
+	setsid();
+	shell_pgrp = getpid ();
+	setpgid (shell_pgrp, shell_pgrp);
+
+	/* Grab control of the terminal.  */
+	tcsetpgrp(shell_terminal, shell_pgrp);
+}
+
+int hush_main(int argc, char * const *argv)
+{
+	int opt;
+	FILE *input;
+	char **e = environ;
+
+	/* XXX what should these be while sourcing /etc/profile? */
+	global_argc = argc;
+	global_argv = argv;
+
+	/* (re?) initialize globals.  Sometimes hush_main() ends up calling
+	 * hush_main(), therefore we cannot rely on the BSS to zero out this
+	 * stuff.  Reset these to 0 every time. */
+	ifs = NULL;
+	/* map[] is taken care of with call to update_ifs_map() */
+	fake_mode = 0;
+	interactive = 0;
+	close_me_head = NULL;
+	last_bg_pid = 0;
+	job_list = NULL;
+	last_jobid = 0;
+
+	/* Initialize some more globals to non-zero values */
+	set_cwd();
+#ifdef CONFIG_FEATURE_COMMAND_EDITING
+	cmdedit_set_initial_prompt();
+#else
+	PS1 = NULL;
+#endif
+	PS2 = "> ";
+
+	/* initialize our shell local variables with the values
+	 * currently living in the environment */
+	if (e) {
+		for (; *e; e++)
+			set_local_var(*e, 2);   /* without call putenv() */
+	}
+
+	last_return_code=EXIT_SUCCESS;
+
+
+	if (argv[0] && argv[0][0] == '-') {
+		debug_printf("\nsourcing /etc/profile\n");
+		if ((input = fopen("/etc/profile", "r")) != NULL) {
+			mark_open(fileno(input));
+			parse_file_outer(input);
+			mark_closed(fileno(input));
+			fclose(input);
+		}
+	}
+	input=stdin;
+
+	while ((opt = getopt(argc, argv, "c:xif")) > 0) {
+		switch (opt) {
+			case 'c':
+				{
+					global_argv = argv+optind;
+					global_argc = argc-optind;
+					opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON);
+					goto final_return;
+				}
+				break;
+			case 'i':
+				interactive++;
+				break;
+			case 'f':
+				fake_mode++;
+				break;
+			default:
+#ifndef BB_VER
+				fprintf(stderr, "Usage: sh [FILE]...\n"
+						"   or: sh -c command [args]...\n\n");
+				exit(EXIT_FAILURE);
+#else
+				show_usage();
+#endif
+		}
+	}
+	/* A shell is interactive if the `-i' flag was given, or if all of
+	 * the following conditions are met:
+	 *	  no -c command
+	 *    no arguments remaining or the -s flag given
+	 *    standard input is a terminal
+	 *    standard output is a terminal
+	 *    Refer to Posix.2, the description of the `sh' utility. */
+	if (argv[optind]==NULL && input==stdin &&
+			isatty(fileno(stdin)) && isatty(fileno(stdout))) {
+		interactive++;
+	}
+
+	debug_printf("\ninteractive=%d\n", interactive);
+	if (interactive) {
+		/* Looks like they want an interactive shell */
+#ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
+		printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n");
+		printf( "Enter 'help' for a list of built-in commands.\n\n");
+#endif
+		setup_job_control();
+	}
+
+	if (argv[optind]==NULL) {
+		opt=parse_file_outer(stdin);
+		goto final_return;
+	}
+
+	debug_printf("\nrunning script '%s'\n", argv[optind]);
+	global_argv = argv+optind;
+	global_argc = argc-optind;
+	input = xfopen(argv[optind], "r");
+	opt = parse_file_outer(input);
+
+#ifdef CONFIG_FEATURE_CLEAN_UP
+	fclose(input);
+	if (cwd && cwd != unknown)
+		free((char*)cwd);
+	{
+		struct variables *cur, *tmp;
+		for(cur = top_vars; cur; cur = tmp) {
+			tmp = cur->next;
+			if (!cur->flg_read_only) {
+				free(cur->name);
+				free(cur->value);
+				free(cur);
+			}
+		}
+	}
+#endif
+
+final_return:
+	return(opt?opt:last_return_code);
+}
+#endif
+
+static char *insert_var_value(char *inp)
+{
+	return insert_var_value_sub(inp, 0);
+}
+
+static char *insert_var_value_sub(char *inp, int tag_subst)
+{
+	int res_str_len = 0;
+	int len;
+	int done = 0;
+	char *p, *p1, *res_str = NULL;
+
+	while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) {
+		/* check the beginning of the string for normal charachters */
+		if (p != inp) {
+			/* copy any charachters to the result string */
+			len = p - inp;
+			res_str = xrealloc(res_str, (res_str_len + len));
+			strncpy((res_str + res_str_len), inp, len);
+			res_str_len += len;
+		}
+		inp = ++p;
+		/* find the ending marker */
+		p = strchr(inp, SPECIAL_VAR_SYMBOL);
+		*p = '\0';
+		/* look up the value to substitute */
+		if ((p1 = lookup_param(inp))) {
+			if (tag_subst)
+				len = res_str_len + strlen(p1) + 2;
+			else
+				len = res_str_len + strlen(p1);
+			res_str = xrealloc(res_str, (1 + len));
+			if (tag_subst) {
+				/*
+				 * copy the variable value to the result
+				 * string
+				 */
+				strcpy((res_str + res_str_len + 1), p1);
+
+				/*
+				 * mark the replaced text to be accepted as
+				 * is
+				 */
+				res_str[res_str_len] = SUBSTED_VAR_SYMBOL;
+				res_str[res_str_len + 1 + strlen(p1)] =
+					SUBSTED_VAR_SYMBOL;
+			} else
+				/*
+				 * copy the variable value to the result
+				 * string
+				 */
+				strcpy((res_str + res_str_len), p1);
+
+			res_str_len = len;
+		}
+		*p = SPECIAL_VAR_SYMBOL;
+		inp = ++p;
+		done = 1;
+	}
+	if (done) {
+		res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp)));
+		strcpy((res_str + res_str_len), inp);
+		while ((p = strchr(res_str, '\n'))) {
+			*p = ' ';
+		}
+	}
+	return (res_str == NULL) ? inp : res_str;
+}
+
+static char **make_list_in(char **inp, char *name)
+{
+	int len, i;
+	int name_len = strlen(name);
+	int n = 0;
+	char **list;
+	char *p1, *p2, *p3;
+
+	/* create list of variable values */
+	list = xmalloc(sizeof(*list));
+	for (i = 0; inp[i]; i++) {
+		p3 = insert_var_value(inp[i]);
+		p1 = p3;
+		while (*p1) {
+			if ((*p1 == ' ')) {
+				p1++;
+				continue;
+			}
+			if ((p2 = strchr(p1, ' '))) {
+				len = p2 - p1;
+			} else {
+				len = strlen(p1);
+				p2 = p1 + len;
+			}
+			/* we use n + 2 in realloc for list,because we add
+			 * new element and then we will add NULL element */
+			list = xrealloc(list, sizeof(*list) * (n + 2));
+			list[n] = xmalloc(2 + name_len + len);
+			strcpy(list[n], name);
+			strcat(list[n], "=");
+			strncat(list[n], p1, len);
+			list[n++][name_len + len + 1] = '\0';
+			p1 = p2;
+		}
+		if (p3 != inp[i]) free(p3);
+	}
+	list[n] = NULL;
+	return list;
+}
+
+/*
+ * Make new string for parser
+ * inp     - array of argument strings to flatten
+ * nonnull - indicates argument was quoted when originally parsed
+ */
+static char *make_string(char **inp, int *nonnull)
+{
+	char *p;
+	char *str = NULL;
+	int n;
+	int len = 2;
+	char *noeval_str;
+	int noeval = 0;
+
+	noeval_str = get_local_var("HUSH_NO_EVAL");
+	if (noeval_str != NULL && *noeval_str != '0' && *noeval_str != '\0')
+		noeval = 1;
+	for (n = 0; inp[n]; n++) {
+		p = insert_var_value_sub(inp[n], noeval);
+		str = xrealloc(str, (len + strlen(p) + (2 * nonnull[n])));
+		if (n) {
+			strcat(str, " ");
+		} else {
+			*str = '\0';
+		}
+		if (nonnull[n])
+			strcat(str, "'");
+		strcat(str, p);
+		if (nonnull[n])
+			strcat(str, "'");
+		len = strlen(str) + 3;
+		if (p != inp[n]) free(p);
+	}
+	len = strlen(str);
+	*(str + len) = '\n';
+	*(str + len + 1) = '\0';
+	return str;
+}
+
+#ifdef __U_BOOT__
+static int do_showvar(cmd_tbl_t *cmdtp, int flag, int argc,
+		      char * const argv[])
+{
+	int i, k;
+	int rcode = 0;
+	struct variables *cur;
+
+	if (argc == 1) {		/* Print all env variables	*/
+		for (cur = top_vars; cur; cur = cur->next) {
+			printf ("%s=%s\n", cur->name, cur->value);
+			if (ctrlc ()) {
+				puts ("\n ** Abort\n");
+				return 1;
+			}
+		}
+		return 0;
+	}
+	for (i = 1; i < argc; ++i) {	/* print single env variables	*/
+		char *name = argv[i];
+
+		k = -1;
+		for (cur = top_vars; cur; cur = cur->next) {
+			if(strcmp (cur->name, name) == 0) {
+				k = 0;
+				printf ("%s=%s\n", cur->name, cur->value);
+			}
+			if (ctrlc ()) {
+				puts ("\n ** Abort\n");
+				return 1;
+			}
+		}
+		if (k < 0) {
+			printf ("## Error: \"%s\" not defined\n", name);
+			rcode ++;
+		}
+	}
+	return rcode;
+}
+
+U_BOOT_CMD(
+	showvar, CONFIG_SYS_MAXARGS, 1,	do_showvar,
+	"print local hushshell variables",
+	"\n    - print values of all hushshell variables\n"
+	"showvar name ...\n"
+	"    - print value of hushshell variable 'name'"
+);
+
+#endif
+/****************************************************************************/