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u-boot-brain/common/cli_hush.c
Rasmus Villemoes 8d5d97cb28 cli_hush.c: remove broken sanity check 
This code is intended do prevent one from setting a shell variable abc
by doing

  abc=123

if an environment variable named abc already exists. However, the
check is broken, since the env_get is done before the split on =, so
we look up whether an environment variable "abc=123" exists, which is
obviously never the case.

One could move the code to below the split on =, but instead, just
remove it, saving a little .text: The check has never worked as
intended (it goes all the way back to the initial git commit), and it
would anyway not guard against one first setting the shell variable,
then doing 'env set abc xyz'.

Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
2020-10-22 09:54:53 -04:00

3708 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* 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
*/
#define __U_BOOT__
#ifdef __U_BOOT__
#include <common.h> /* readline */
#include <env.h>
#include <malloc.h> /* malloc, free, realloc*/
#include <linux/ctype.h> /* isalpha, isdigit */
#include <console.h>
#include <bootretry.h>
#include <cli.h>
#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 = env_get("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 = env_get("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
#ifdef __U_BOOT__
static int uboot_cli_readline(struct in_str *i)
{
char *prompt;
char __maybe_unused *ps_prompt = NULL;
if (i->promptmode == 1)
prompt = CONFIG_SYS_PROMPT;
else
prompt = CONFIG_SYS_PROMPT_HUSH_PS2;
#ifdef CONFIG_CMDLINE_PS_SUPPORT
if (i->promptmode == 1)
ps_prompt = env_get("PS1");
else
ps_prompt = env_get("PS2");
if (ps_prompt)
prompt = ps_prompt;
#endif
return cli_readline(prompt);
}
#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];
bootretry_reset_cmd_timeout();
i->__promptme = 1;
n = uboot_cli_readline(i);
#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 */
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);
/* 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 + 1) == 0) {
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)
unenv_set(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) {
free(str);
return 1;
}
child->argv_nonnull = realloc(child->argv_nonnull,
(argc+1)*sizeof(*child->argv_nonnull));
if (child->argv_nonnull == NULL) {
free(str);
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 = env_get(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 *)env_get("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 = 1;
#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,
flag & FLAG_CONT_ON_NEWLINE ? -1 : '\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);
/* loop on syntax errors, return on EOF */
} while (rcode != -1 && !(flag & FLAG_EXIT_FROM_LOOP) &&
(inp->peek != static_peek || b_peek(inp)));
#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)
return 1;
if (!*s)
return 0;
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 characters */
if (p != inp) {
/* copy any characters 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(struct cmd_tbl *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
/****************************************************************************/
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