cli_hush.c 93.6 KB
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/*
 * 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
 *
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 * SPDX-License-Identifier:	GPL-2.0+
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 */
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#define __U_BOOT__
#ifdef __U_BOOT__
#include <malloc.h>         /* malloc, free, realloc*/
#include <linux/ctype.h>    /* isalpha, isdigit */
#include <common.h>        /* readline */
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#include <console.h>
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#include <bootretry.h>
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#include <cli.h>
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#include <cli_hush.h>
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#include <command.h>        /* find_cmd */
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#ifndef CONFIG_SYS_PROMPT_HUSH_PS2
#define CONFIG_SYS_PROMPT_HUSH_PS2	"> "
#endif
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#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> */

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#if 1
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#include "busybox.h"
#include "cmdedit.h"
#else
#define applet_name "hush"
#include "standalone.h"
#define hush_main main
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#undef CONFIG_FEATURE_SH_FANCY_PROMPT
#define BB_BANNER
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#endif
#endif
#define SPECIAL_VAR_SYMBOL 03
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#define SUBSTED_VAR_SYMBOL 04
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#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__
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DECLARE_GLOBAL_DATA_PTR;

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#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 */
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	/* was quoted when parsed; copy of struct o_string.nonnull field */
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	int *argv_nonnull;
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#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
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static unsigned int last_return_code;
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#ifndef __U_BOOT__
extern char **environ; /* This is in <unistd.h>, but protected with __USE_GNU */
#endif

/* "globals" within this file */
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static uchar *ifs;
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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;
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static struct variables *top_vars = NULL ;
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#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

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/* define DEBUG_SHELL for debugging output (obviously ;-)) */
#if 0
#define DEBUG_SHELL
#endif

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/* 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
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#define debug_printf(fmt,args...)	printf (fmt ,##args)
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#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);
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#ifndef __U_BOOT__
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static int b_adduint(o_string *o, unsigned int i);
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#endif
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/*  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);
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static void close_all(void);
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#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);
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static char *make_string(char **inp, int *nonnull);
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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);
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static char *insert_var_value_sub(char *inp, int tag_subst);
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#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);
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	free(o->data);
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	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);
}

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#ifndef __U_BOOT__
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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;
}
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#endif
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static int static_get(struct in_str *i)
{
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	int ch = *i->p++;
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	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)
{
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#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
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	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);
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#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
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	/* Set up the prompt */
	if (promptmode == 1) {
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		free(PS1);
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		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

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#ifdef __U_BOOT__
static int uboot_cli_readline(struct in_str *i)
{
	char *prompt;
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	char __maybe_unused *ps_prompt = NULL;
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	if (i->promptmode == 1)
		prompt = CONFIG_SYS_PROMPT;
	else
		prompt = CONFIG_SYS_PROMPT_HUSH_PS2;

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#ifdef CONFIG_CMDLINE_PS_SUPPORT
	if (i->promptmode == 1)
		ps_prompt = getenv("PS1");
	else
		ps_prompt = getenv("PS2");
	if (ps_prompt)
		prompt = ps_prompt;
#endif

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	return cli_readline(prompt);
}
#endif

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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);
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#ifdef CONFIG_FEATURE_COMMAND_EDITING
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	/*
	 ** 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;
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	static char the_command[CONFIG_SYS_CBSIZE + 1];
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	bootretry_reset_cmd_timeout();
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	i->__promptme = 1;
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	n = uboot_cli_readline(i);

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#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
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	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 {
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		if (console_buffer[0] != '\n') {
			if (strlen(the_command) + strlen(console_buffer)
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			    < CONFIG_SYS_CBSIZE) {
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				n = strlen(the_command);
				the_command[n-1] = ' ';
				strcpy(&the_command[n],console_buffer);
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			}
			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) {
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		ch = *i->p++;
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	} 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) {
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				ch = *i->p++;
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			}
#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);
}

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static void close_all(void)
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{
	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
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					to exit, and therefore don't need to keep data
					structures consistent for free() use. */
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		/* 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... */
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#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
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		{
			int argc_l;
			char** argv_l=child->argv;
			char *name = child->argv[0];

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#ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
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			/* 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.
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			 * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets
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			 * _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;
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# if __GNUC__
	/* Avoid longjmp clobbering */
	(void) &i;
	(void) &nextin;
	(void) &nextout;
	(void) &child;
# endif
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#else
	int nextin;
	int flag = do_repeat ? CMD_FLAG_REPEAT : 0;
	struct child_prog *child;
	char *p;
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# if __GNUC__
	/* Avoid longjmp clobbering */
	(void) &i;
	(void) &nextin;
	(void) &child;
# endif
#endif	/* __U_BOOT__ */
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	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;

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			str = make_string(child->argv + i,
					  child->argv_nonnull + i);
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			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);
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				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;
		}
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#else
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		/* 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;
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		}
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		/* Process the command */
		return cmd_process(flag, child->argc, child->argv,
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				   &flag_repeat, NULL);
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#endif
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	}
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#ifndef __U_BOOT__
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	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;
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		if (rmode == RES_ELIF && !if_code) break;
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		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;
		}
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		if (rmode == RES_DONE) {
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			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
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		if (rcode < -1) {
			last_return_code = -rcode - 2;
			return -2;	/* exit */
		}
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		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
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			for (a = 0; a < child->argc; a++) {
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				free(child->argv[a]);
			}
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			free(child->argv);
			free(child->argv_nonnull);
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			child->argc = 0;
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#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;

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	/* short-circuit for null word */
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	/* we can code this better when the debug_printf's are gone */
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	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 {
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			return 0;
		}
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	} else if (glob_needed(dest->data)) {
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		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

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#ifdef __U_BOOT__
static char *get_dollar_var(char ch);
#endif

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/* This is used to get/check local shell variables */
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char *get_local_var(const char *s)
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{
	struct variables *cur;

	if (!s)
		return NULL;
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#ifdef __U_BOOT__
	if (*s == '$')
		return get_dollar_var(s[1]);
#endif

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	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()) */
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int set_local_var(const char *s, int flg_export)
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{
	char *name, *value;
	int result=0;
	struct variables *cur;

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#ifdef __U_BOOT__
	/* might be possible! */
	if (!isalpha(*s))
		return -1;
#endif

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	name=strdup(s);

#ifdef __U_BOOT__
	if (getenv(name) != NULL) {
		printf ("ERROR: "
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				"There is a global environment variable with the same name.\n");
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		free(name);
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		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, '=');
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	if (value == NULL || *(value + 1) == 0) {
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		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);
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			if (cur->name == NULL) {
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				free(cur);
				result = -1;
			} else {
				struct variables *bottom = top_vars;
				cur->value = strdup(value);
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				cur->next = NULL;
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				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;
}

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void unset_local_var(const char *name)
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{
	struct variables *cur;

	if (name) {
		for (cur = top_vars; cur; cur=cur->next) {
			if(strcmp(cur->name, name)==0)
				break;
		}
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		if (cur != NULL) {
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			struct variables *next = top_vars;
			if(cur->flg_read_only) {
				error_msg("%s: readonly variable", name);
				return;
			} else {
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#ifndef __U_BOOT__
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				if(cur->flg_export)
					unsetenv(cur->name);
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#endif
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				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)
{
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	if (s == NULL)
		return 0;

	if (!isalpha(*s)) return 0;
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	++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

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static struct pipe *new_pipe(void)
{
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	struct pipe *pi;
	pi = xmalloc(sizeof(struct pipe));
	pi->num_progs = 0;
	pi->progs = NULL;
	pi->next = NULL;
	pi->followup = 0;  /* invalid */
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	pi->r_mode = RES_NONE;
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	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.
 */
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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))

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static int reserved_word(o_string *dest, struct p_context *ctx)
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{
	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;<