diff options
Diffstat (limited to 'common/cli_hush.c')
| -rw-r--r-- | common/cli_hush.c | 3686 |
1 files changed, 3686 insertions, 0 deletions
diff --git a/common/cli_hush.c b/common/cli_hush.c new file mode 100644 index 0000000..38da5a0 --- /dev/null +++ b/common/cli_hush.c @@ -0,0 +1,3686 @@ +/* + * sh.c -- a prototype Bourne shell grammar parser + * Intended to follow the original Thompson and Ritchie + * "small and simple is beautiful" philosophy, which + * incidentally is a good match to today's BusyBox. + * + * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org> + * + * Credits: + * The parser routines proper are all original material, first + * written Dec 2000 and Jan 2001 by Larry Doolittle. + * The execution engine, the builtins, and much of the underlying + * support has been adapted from busybox-0.49pre's lash, + * which is Copyright (C) 2000 by Lineo, Inc., and + * written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>. + * That, in turn, is based in part on ladsh.c, by Michael K. Johnson and + * Erik W. Troan, which they placed in the public domain. I don't know + * how much of the Johnson/Troan code has survived the repeated rewrites. + * Other credits: + * b_addchr() derived from similar w_addchar function in glibc-2.2 + * setup_redirect(), redirect_opt_num(), and big chunks of main() + * and many builtins derived from contributions by Erik Andersen + * miscellaneous bugfixes from Matt Kraai + * + * There are two big (and related) architecture differences between + * this parser and the lash parser. One is that this version is + * actually designed from the ground up to understand nearly all + * of the Bourne grammar. The second, consequential change is that + * the parser and input reader have been turned inside out. Now, + * the parser is in control, and asks for input as needed. The old + * way had the input reader in control, and it asked for parsing to + * take place as needed. The new way makes it much easier to properly + * handle the recursion implicit in the various substitutions, especially + * across continuation lines. + * + * Bash grammar not implemented: (how many of these were in original sh?) + * $@ (those sure look like weird quoting rules) + * $_ + * ! negation operator for pipes + * &> and >& redirection of stdout+stderr + * Brace Expansion + * Tilde Expansion + * fancy forms of Parameter Expansion + * aliases + * Arithmetic Expansion + * <(list) and >(list) Process Substitution + * reserved words: case, esac, select, function + * Here Documents ( << word ) + * Functions + * Major bugs: + * job handling woefully incomplete and buggy + * reserved word execution woefully incomplete and buggy + * to-do: + * port selected bugfixes from post-0.49 busybox lash - done? + * finish implementing reserved words: for, while, until, do, done + * change { and } from special chars to reserved words + * builtins: break, continue, eval, return, set, trap, ulimit + * test magic exec + * handle children going into background + * clean up recognition of null pipes + * check setting of global_argc and global_argv + * control-C handling, probably with longjmp + * follow IFS rules more precisely, including update semantics + * figure out what to do with backslash-newline + * explain why we use signal instead of sigaction + * propagate syntax errors, die on resource errors? + * continuation lines, both explicit and implicit - done? + * memory leak finding and plugging - done? + * more testing, especially quoting rules and redirection + * document how quoting rules not precisely followed for variable assignments + * maybe change map[] to use 2-bit entries + * (eventually) remove all the printf's + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#define __U_BOOT__ +#ifdef __U_BOOT__ +#include <malloc.h> /* malloc, free, realloc*/ +#include <linux/ctype.h> /* isalpha, isdigit */ +#include <common.h> /* readline */ +#include <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 = getenv("HOME"); + else + newdir = child->argv[1]; + if (chdir(newdir)) { + printf("cd: %s: %s\n", newdir, strerror(errno)); + return EXIT_FAILURE; + } + set_cwd(); + return EXIT_SUCCESS; +} + +/* built-in 'env' handler */ +static int builtin_env(struct child_prog *dummy) +{ + char **e = environ; + if (e == NULL) return EXIT_FAILURE; + for (; *e; e++) { + puts(*e); + } + return EXIT_SUCCESS; +} + +/* built-in 'exec' handler */ +static int builtin_exec(struct child_prog *child) +{ + if (child->argv[1] == NULL) + return EXIT_SUCCESS; /* Really? */ + child->argv++; + pseudo_exec(child); + /* never returns */ +} + +/* built-in 'exit' handler */ +static int builtin_exit(struct child_prog *child) +{ + if (child->argv[1] == NULL) + exit(last_return_code); + exit (atoi(child->argv[1])); +} + +/* built-in 'export VAR=value' handler */ +static int builtin_export(struct child_prog *child) +{ + int res = 0; + char *name = child->argv[1]; + + if (name == NULL) { + return (builtin_env(child)); + } + + name = strdup(name); + + if(name) { + char *value = strchr(name, '='); + + if (!value) { + char *tmp; + /* They are exporting something without an =VALUE */ + + value = get_local_var(name); + if (value) { + size_t ln = strlen(name); + + tmp = realloc(name, ln+strlen(value)+2); + if(tmp==NULL) + res = -1; + else { + sprintf(tmp+ln, "=%s", value); + name = tmp; + } + } else { + /* bash does not return an error when trying to export + * an undefined variable. Do likewise. */ + res = 1; + } + } + } + if (res<0) + perror_msg("export"); + else if(res==0) + res = set_local_var(name, 1); + else + res = 0; + free(name); + return res; +} + +/* built-in 'fg' and 'bg' handler */ +static int builtin_fg_bg(struct child_prog *child) +{ + int i, jobnum; + struct pipe *pi=NULL; + + if (!interactive) + return EXIT_FAILURE; + /* If they gave us no args, assume they want the last backgrounded task */ + if (!child->argv[1]) { + for (pi = job_list; pi; pi = pi->next) { + if (pi->jobid == last_jobid) { + break; + } + } + if (!pi) { + error_msg("%s: no current job", child->argv[0]); + return EXIT_FAILURE; + } + } else { + if (sscanf(child->argv[1], "%%%d", &jobnum) != 1) { + error_msg("%s: bad argument '%s'", child->argv[0], child->argv[1]); + return EXIT_FAILURE; + } + for (pi = job_list; pi; pi = pi->next) { + if (pi->jobid == jobnum) { + break; + } + } + if (!pi) { + error_msg("%s: %d: no such job", child->argv[0], jobnum); + return EXIT_FAILURE; + } + } + + if (*child->argv[0] == 'f') { + /* Put the job into the foreground. */ + tcsetpgrp(shell_terminal, pi->pgrp); + } + + /* Restart the processes in the job */ + for (i = 0; i < pi->num_progs; i++) + pi->progs[i].is_stopped = 0; + + if ( (i=kill(- pi->pgrp, SIGCONT)) < 0) { + if (i == ESRCH) { + remove_bg_job(pi); + } else { + perror_msg("kill (SIGCONT)"); + } + } + + pi->stopped_progs = 0; + return EXIT_SUCCESS; +} + +/* built-in 'help' handler */ +static int builtin_help(struct child_prog *dummy) +{ + struct built_in_command *x; + + printf("\nBuilt-in commands:\n"); + printf("-------------------\n"); + for (x = bltins; x->cmd; x++) { + if (x->descr==NULL) + continue; + printf("%s\t%s\n", x->cmd, x->descr); + } + printf("\n\n"); + return EXIT_SUCCESS; +} + +/* built-in 'jobs' handler */ +static int builtin_jobs(struct child_prog *child) +{ + struct pipe *job; + char *status_string; + + for (job = job_list; job; job = job->next) { + if (job->running_progs == job->stopped_progs) + status_string = "Stopped"; + else + status_string = "Running"; + + printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->text); + } + return EXIT_SUCCESS; +} + + +/* built-in 'pwd' handler */ +static int builtin_pwd(struct child_prog *dummy) +{ + puts(set_cwd()); + return EXIT_SUCCESS; +} + +/* built-in 'read VAR' handler */ +static int builtin_read(struct child_prog *child) +{ + int res; + + if (child->argv[1]) { + char string[BUFSIZ]; + char *var = 0; + + string[0] = 0; /* In case stdin has only EOF */ + /* read string */ + fgets(string, sizeof(string), stdin); + chomp(string); + var = malloc(strlen(child->argv[1])+strlen(string)+2); + if(var) { + sprintf(var, "%s=%s", child->argv[1], string); + res = set_local_var(var, 0); + } else + res = -1; + if (res) + fprintf(stderr, "read: %m\n"); + free(var); /* So not move up to avoid breaking errno */ + return res; + } else { + do res=getchar(); while(res!='\n' && res!=EOF); + return 0; + } +} + +/* built-in 'set VAR=value' handler */ +static int builtin_set(struct child_prog *child) +{ + char *temp = child->argv[1]; + struct variables *e; + + if (temp == NULL) + for(e = top_vars; e; e=e->next) + printf("%s=%s\n", e->name, e->value); + else + set_local_var(temp, 0); + + return EXIT_SUCCESS; +} + + +/* Built-in 'shift' handler */ +static int builtin_shift(struct child_prog *child) +{ + int n=1; + if (child->argv[1]) { + n=atoi(child->argv[1]); + } + if (n>=0 && n<global_argc) { + /* XXX This probably breaks $0 */ + global_argc -= n; + global_argv += n; + return EXIT_SUCCESS; + } else { + return EXIT_FAILURE; + } +} + +/* Built-in '.' handler (read-in and execute commands from file) */ +static int builtin_source(struct child_prog *child) +{ + FILE *input; + int status; + + if (child->argv[1] == NULL) + return EXIT_FAILURE; + + /* XXX search through $PATH is missing */ + input = fopen(child->argv[1], "r"); + if (!input) { + error_msg("Couldn't open file '%s'", child->argv[1]); + return EXIT_FAILURE; + } + + /* Now run the file */ + /* XXX argv and argc are broken; need to save old global_argv + * (pointer only is OK!) on this stack frame, + * set global_argv=child->argv+1, recurse, and restore. */ + mark_open(fileno(input)); + status = parse_file_outer(input); + mark_closed(fileno(input)); + fclose(input); + return (status); +} + +static int builtin_umask(struct child_prog *child) +{ + mode_t new_umask; + const char *arg = child->argv[1]; + char *end; + if (arg) { + new_umask=strtoul(arg, &end, 8); + if (*end!='\0' || end == arg) { + return EXIT_FAILURE; + } + } else { + printf("%.3o\n", (unsigned int) (new_umask=umask(0))); + } + umask(new_umask); + return EXIT_SUCCESS; +} + +/* built-in 'unset VAR' handler */ +static int builtin_unset(struct child_prog *child) +{ + /* bash returned already true */ + unset_local_var(child->argv[1]); + return EXIT_SUCCESS; +} + +static int builtin_not_written(struct child_prog *child) +{ + printf("builtin_%s not written\n",child->argv[0]); + return EXIT_FAILURE; +} +#endif + +static int b_check_space(o_string *o, int len) +{ + /* It would be easy to drop a more restrictive policy + * in here, such as setting a maximum string length */ + if (o->length + len > o->maxlen) { + char *old_data = o->data; + /* assert (data == NULL || o->maxlen != 0); */ + o->maxlen += max(2*len, B_CHUNK); + o->data = realloc(o->data, 1 + o->maxlen); + if (o->data == NULL) { + free(old_data); + } + } + return o->data == NULL; +} + +static int b_addchr(o_string *o, int ch) +{ + debug_printf("b_addchr: %c %d %p\n", ch, o->length, o); + if (b_check_space(o, 1)) return B_NOSPAC; + o->data[o->length] = ch; + o->length++; + o->data[o->length] = '\0'; + return 0; +} + +static void b_reset(o_string *o) +{ + o->length = 0; + o->nonnull = 0; + if (o->data != NULL) *o->data = '\0'; +} + +static void b_free(o_string *o) +{ + b_reset(o); + free(o->data); + o->data = NULL; + o->maxlen = 0; +} + +/* My analysis of quoting semantics tells me that state information + * is associated with a destination, not a source. + */ +static int b_addqchr(o_string *o, int ch, int quote) +{ + if (quote && strchr("*?[\\",ch)) { + int rc; + rc = b_addchr(o, '\\'); + if (rc) return rc; + } + return b_addchr(o, ch); +} + +#ifndef __U_BOOT__ +static int b_adduint(o_string *o, unsigned int i) +{ + int r; + char *p = simple_itoa(i); + /* no escape checking necessary */ + do r=b_addchr(o, *p++); while (r==0 && *p); + return r; +} +#endif + +static int static_get(struct in_str *i) +{ + int ch = *i->p++; + if (ch=='\0') return EOF; + return ch; +} + +static int static_peek(struct in_str *i) +{ + return *i->p; +} + +#ifndef __U_BOOT__ +static inline void cmdedit_set_initial_prompt(void) +{ +#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT + PS1 = NULL; +#else + PS1 = getenv("PS1"); + if(PS1==0) + PS1 = "\\w \\$ "; +#endif +} + +static inline void setup_prompt_string(int promptmode, char **prompt_str) +{ + debug_printf("setup_prompt_string %d ",promptmode); +#ifndef CONFIG_FEATURE_SH_FANCY_PROMPT + /* Set up the prompt */ + if (promptmode == 1) { + free(PS1); + PS1=xmalloc(strlen(cwd)+4); + sprintf(PS1, "%s %s", cwd, ( geteuid() != 0 ) ? "$ ":"# "); + *prompt_str = PS1; + } else { + *prompt_str = PS2; + } +#else + *prompt_str = (promptmode==1)? PS1 : PS2; +#endif + debug_printf("result %s\n",*prompt_str); +} +#endif + +static void get_user_input(struct in_str *i) +{ +#ifndef __U_BOOT__ + char *prompt_str; + static char the_command[BUFSIZ]; + + setup_prompt_string(i->promptmode, &prompt_str); +#ifdef CONFIG_FEATURE_COMMAND_EDITING + /* + ** enable command line editing only while a command line + ** is actually being read; otherwise, we'll end up bequeathing + ** atexit() handlers and other unwanted stuff to our + ** child processes (rob@sysgo.de) + */ + cmdedit_read_input(prompt_str, the_command); +#else + fputs(prompt_str, stdout); + fflush(stdout); + the_command[0]=fgetc(i->file); + the_command[1]='\0'; +#endif + fflush(stdout); + i->p = the_command; +#else + int n; + static char the_command[CONFIG_SYS_CBSIZE + 1]; + + bootretry_reset_cmd_timeout(); + i->__promptme = 1; + if (i->promptmode == 1) { + n = cli_readline(CONFIG_SYS_PROMPT); + } else { + n = cli_readline(CONFIG_SYS_PROMPT_HUSH_PS2); + } +#ifdef CONFIG_BOOT_RETRY_TIME + if (n == -2) { + puts("\nTimeout waiting for command\n"); +# ifdef CONFIG_RESET_TO_RETRY + do_reset(NULL, 0, 0, NULL); +# else +# error "This currently only works with CONFIG_RESET_TO_RETRY enabled" +# endif + } +#endif + if (n == -1 ) { + flag_repeat = 0; + i->__promptme = 0; + } + n = strlen(console_buffer); + console_buffer[n] = '\n'; + console_buffer[n+1]= '\0'; + if (had_ctrlc()) flag_repeat = 0; + clear_ctrlc(); + do_repeat = 0; + if (i->promptmode == 1) { + if (console_buffer[0] == '\n'&& flag_repeat == 0) { + strcpy(the_command,console_buffer); + } + else { + if (console_buffer[0] != '\n') { + strcpy(the_command,console_buffer); + flag_repeat = 1; + } + else { + do_repeat = 1; + } + } + i->p = the_command; + } + else { + if (console_buffer[0] != '\n') { + if (strlen(the_command) + strlen(console_buffer) + < CONFIG_SYS_CBSIZE) { + n = strlen(the_command); + the_command[n-1] = ' '; + strcpy(&the_command[n],console_buffer); + } + else { + the_command[0] = '\n'; + the_command[1] = '\0'; + flag_repeat = 0; + } + } + if (i->__promptme == 0) { + the_command[0] = '\n'; + the_command[1] = '\0'; + } + i->p = console_buffer; + } +#endif +} + +/* This is the magic location that prints prompts + * and gets data back from the user */ +static int file_get(struct in_str *i) +{ + int ch; + + ch = 0; + /* If there is data waiting, eat it up */ + if (i->p && *i->p) { + ch = *i->p++; + } else { + /* need to double check i->file because we might be doing something + * more complicated by now, like sourcing or substituting. */ +#ifndef __U_BOOT__ + if (i->__promptme && interactive && i->file == stdin) { + while(! i->p || (interactive && strlen(i->p)==0) ) { +#else + while(! i->p || strlen(i->p)==0 ) { +#endif + get_user_input(i); + } + i->promptmode=2; +#ifndef __U_BOOT__ + i->__promptme = 0; +#endif + if (i->p && *i->p) { + ch = *i->p++; + } +#ifndef __U_BOOT__ + } else { + ch = fgetc(i->file); + } + +#endif + debug_printf("b_getch: got a %d\n", ch); + } +#ifndef __U_BOOT__ + if (ch == '\n') i->__promptme=1; +#endif + return ch; +} + +/* All the callers guarantee this routine will never be + * used right after a newline, so prompting is not needed. + */ +static int file_peek(struct in_str *i) +{ +#ifndef __U_BOOT__ + if (i->p && *i->p) { +#endif + return *i->p; +#ifndef __U_BOOT__ + } else { + i->peek_buf[0] = fgetc(i->file); + i->peek_buf[1] = '\0'; + i->p = i->peek_buf; + debug_printf("b_peek: got a %d\n", *i->p); + return *i->p; + } +#endif +} + +#ifndef __U_BOOT__ +static void setup_file_in_str(struct in_str *i, FILE *f) +#else +static void setup_file_in_str(struct in_str *i) +#endif +{ + i->peek = file_peek; + i->get = file_get; + i->__promptme=1; + i->promptmode=1; +#ifndef __U_BOOT__ + i->file = f; +#endif + i->p = NULL; +} + +static void setup_string_in_str(struct in_str *i, const char *s) +{ + i->peek = static_peek; + i->get = static_get; + i->__promptme=1; + i->promptmode=1; + i->p = s; +} + +#ifndef __U_BOOT__ +static void mark_open(int fd) +{ + struct close_me *new = xmalloc(sizeof(struct close_me)); + new->fd = fd; + new->next = close_me_head; + close_me_head = new; +} + +static void mark_closed(int fd) +{ + struct close_me *tmp; + if (close_me_head == NULL || close_me_head->fd != fd) + error_msg_and_die("corrupt close_me"); + tmp = close_me_head; + close_me_head = close_me_head->next; + free(tmp); +} + +static void close_all(void) +{ + struct close_me *c; + for (c=close_me_head; c; c=c->next) { + close(c->fd); + } + close_me_head = NULL; +} + +/* squirrel != NULL means we squirrel away copies of stdin, stdout, + * and stderr if they are redirected. */ +static int setup_redirects(struct child_prog *prog, int squirrel[]) +{ + int openfd, mode; + struct redir_struct *redir; + + for (redir=prog->redirects; redir; redir=redir->next) { + if (redir->dup == -1 && redir->word.gl_pathv == NULL) { + /* something went wrong in the parse. Pretend it didn't happen */ + continue; + } + if (redir->dup == -1) { + mode=redir_table[redir->type].mode; + openfd = open(redir->word.gl_pathv[0], mode, 0666); + if (openfd < 0) { + /* this could get lost if stderr has been redirected, but + bash and ash both lose it as well (though zsh doesn't!) */ + perror_msg("error opening %s", redir->word.gl_pathv[0]); + return 1; + } + } else { + openfd = redir->dup; + } + + if (openfd != redir->fd) { + if (squirrel && redir->fd < 3) { + squirrel[redir->fd] = dup(redir->fd); + } + if (openfd == -3) { + close(openfd); + } else { + dup2(openfd, redir->fd); + if (redir->dup == -1) + close (openfd); + } + } + } + return 0; +} + +static void restore_redirects(int squirrel[]) +{ + int i, fd; + for (i=0; i<3; i++) { + fd = squirrel[i]; + if (fd != -1) { + /* No error checking. I sure wouldn't know what + * to do with an error if I found one! */ + dup2(fd, i); + close(fd); + } + } +} + +/* never returns */ +/* XXX no exit() here. If you don't exec, use _exit instead. + * The at_exit handlers apparently confuse the calling process, + * in particular stdin handling. Not sure why? */ +static void pseudo_exec(struct child_prog *child) +{ + int i, rcode; + char *p; + struct built_in_command *x; + if (child->argv) { + for (i=0; is_assignment(child->argv[i]); i++) { + debug_printf("pid %d environment modification: %s\n",getpid(),child->argv[i]); + p = insert_var_value(child->argv[i]); + putenv(strdup(p)); + if (p != child->argv[i]) free(p); + } + child->argv+=i; /* XXX this hack isn't so horrible, since we are about + to exit, and therefore don't need to keep data + structures consistent for free() use. */ + /* If a variable is assigned in a forest, and nobody listens, + * was it ever really set? + */ + if (child->argv[0] == NULL) { + _exit(EXIT_SUCCESS); + } + + /* + * Check if the command matches any of the builtins. + * Depending on context, this might be redundant. But it's + * easier to waste a few CPU cycles than it is to figure out + * if this is one of those cases. + */ + for (x = bltins; x->cmd; x++) { + if (strcmp(child->argv[0], x->cmd) == 0 ) { + debug_printf("builtin exec %s\n", child->argv[0]); + rcode = x->function(child); + fflush(stdout); + _exit(rcode); + } + } + + /* Check if the command matches any busybox internal commands + * ("applets") here. + * FIXME: This feature is not 100% safe, since + * BusyBox is not fully reentrant, so we have no guarantee the things + * from the .bss are still zeroed, or that things from .data are still + * at their defaults. We could exec ourself from /proc/self/exe, but I + * really dislike relying on /proc for things. We could exec ourself + * from global_argv[0], but if we are in a chroot, we may not be able + * to find ourself... */ +#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL + { + int argc_l; + char** argv_l=child->argv; + char *name = child->argv[0]; + +#ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN + /* Following discussions from November 2000 on the busybox mailing + * list, the default configuration, (without + * get_last_path_component()) lets the user force use of an + * external command by specifying the full (with slashes) filename. + * If you enable CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN then applets + * _aways_ override external commands, so if you want to run + * /bin/cat, it will use BusyBox cat even if /bin/cat exists on the + * filesystem and is _not_ busybox. Some systems may want this, + * most do not. */ + name = get_last_path_component(name); +#endif + /* Count argc for use in a second... */ + for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++); + optind = 1; + debug_printf("running applet %s\n", name); + run_applet_by_name(name, argc_l, child->argv); + } +#endif + debug_printf("exec of %s\n",child->argv[0]); + execvp(child->argv[0],child->argv); + perror_msg("couldn't exec: %s",child->argv[0]); + _exit(1); + } else if (child->group) { + debug_printf("runtime nesting to group\n"); + interactive=0; /* crucial!!!! */ + rcode = run_list_real(child->group); + /* OK to leak memory by not calling free_pipe_list, + * since this process is about to exit */ + _exit(rcode); + } else { + /* Can happen. See what bash does with ">foo" by itself. */ + debug_printf("trying to pseudo_exec null command\n"); + _exit(EXIT_SUCCESS); + } +} + +static void insert_bg_job(struct pipe *pi) +{ + struct pipe *thejob; + + /* Linear search for the ID of the job to use */ + pi->jobid = 1; + for (thejob = job_list; thejob; thejob = thejob->next) + if (thejob->jobid >= pi->jobid) + pi->jobid = thejob->jobid + 1; + + /* add thejob to the list of running jobs */ + if (!job_list) { + thejob = job_list = xmalloc(sizeof(*thejob)); + } else { + for (thejob = job_list; thejob->next; thejob = thejob->next) /* nothing */; + thejob->next = xmalloc(sizeof(*thejob)); + thejob = thejob->next; + } + + /* physically copy the struct job */ + memcpy(thejob, pi, sizeof(struct pipe)); + thejob->next = NULL; + thejob->running_progs = thejob->num_progs; + thejob->stopped_progs = 0; + thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */ + + /*if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0]) */ + { + char *bar=thejob->text; + char **foo=pi->progs[0].argv; + while(foo && *foo) { + bar += sprintf(bar, "%s ", *foo++); + } + } + + /* we don't wait for background thejobs to return -- append it + to the list of backgrounded thejobs and leave it alone */ + printf("[%d] %d\n", thejob->jobid, thejob->progs[0].pid); + last_bg_pid = thejob->progs[0].pid; + last_jobid = thejob->jobid; +} + +/* remove a backgrounded job */ +static void remove_bg_job(struct pipe *pi) +{ + struct pipe *prev_pipe; + + if (pi == job_list) { + job_list = pi->next; + } else { + prev_pipe = job_list; + while (prev_pipe->next != pi) + prev_pipe = prev_pipe->next; + prev_pipe->next = pi->next; + } + if (job_list) + last_jobid = job_list->jobid; + else + last_jobid = 0; + + pi->stopped_progs = 0; + free_pipe(pi, 0); + free(pi); +} + +/* Checks to see if any processes have exited -- if they + have, figure out why and see if a job has completed */ +static int checkjobs(struct pipe* fg_pipe) +{ + int attributes; + int status; + int prognum = 0; + struct pipe *pi; + pid_t childpid; + + attributes = WUNTRACED; + if (fg_pipe==NULL) { + attributes |= WNOHANG; + } + + while ((childpid = waitpid(-1, &status, attributes)) > 0) { + if (fg_pipe) { + int i, rcode = 0; + for (i=0; i < fg_pipe->num_progs; i++) { + if (fg_pipe->progs[i].pid == childpid) { + if (i==fg_pipe->num_progs-1) + rcode=WEXITSTATUS(status); + (fg_pipe->num_progs)--; + return(rcode); + } + } + } + + for (pi = job_list; pi; pi = pi->next) { + prognum = 0; + while (prognum < pi->num_progs && pi->progs[prognum].pid != childpid) { + prognum++; + } + if (prognum < pi->num_progs) + break; + } + + if(pi==NULL) { + debug_printf("checkjobs: pid %d was not in our list!\n", childpid); + continue; + } + + if (WIFEXITED(status) || WIFSIGNALED(status)) { + /* child exited */ + pi->running_progs--; + pi->progs[prognum].pid = 0; + + if (!pi->running_progs) { + printf(JOB_STATUS_FORMAT, pi->jobid, "Done", pi->text); + remove_bg_job(pi); + } + } else { + /* child stopped */ + pi->stopped_progs++; + pi->progs[prognum].is_stopped = 1; + +#if 0 + /* Printing this stuff is a pain, since it tends to + * overwrite the prompt an inconveinient moments. So + * don't do that. */ + if (pi->stopped_progs == pi->num_progs) { + printf("\n"JOB_STATUS_FORMAT, pi->jobid, "Stopped", pi->text); + } +#endif + } + } + + if (childpid == -1 && errno != ECHILD) + perror_msg("waitpid"); + + /* move the shell to the foreground */ + /*if (interactive && tcsetpgrp(shell_terminal, getpgid(0))) */ + /* perror_msg("tcsetpgrp-2"); */ + return -1; +} + +/* Figure out our controlling tty, checking in order stderr, + * stdin, and stdout. If check_pgrp is set, also check that + * we belong to the foreground process group associated with + * that tty. The value of shell_terminal is needed in order to call + * tcsetpgrp(shell_terminal, ...); */ +void controlling_tty(int check_pgrp) +{ + pid_t curpgrp; + + if ((curpgrp = tcgetpgrp(shell_terminal = 2)) < 0 + && (curpgrp = tcgetpgrp(shell_terminal = 0)) < 0 + && (curpgrp = tcgetpgrp(shell_terminal = 1)) < 0) + goto shell_terminal_error; + + if (check_pgrp && curpgrp != getpgid(0)) + goto shell_terminal_error; + + return; + +shell_terminal_error: + shell_terminal = -1; + return; +} +#endif + +/* run_pipe_real() starts all the jobs, but doesn't wait for anything + * to finish. See checkjobs(). + * + * return code is normally -1, when the caller has to wait for children + * to finish to determine the exit status of the pipe. If the pipe + * is a simple builtin command, however, the action is done by the + * time run_pipe_real returns, and the exit code is provided as the + * return value. + * + * The input of the pipe is always stdin, the output is always + * stdout. The outpipe[] mechanism in BusyBox-0.48 lash is bogus, + * because it tries to avoid running the command substitution in + * subshell, when that is in fact necessary. The subshell process + * now has its stdout directed to the input of the appropriate pipe, + * so this routine is noticeably simpler. + */ +static int run_pipe_real(struct pipe *pi) +{ + int i; +#ifndef __U_BOOT__ + int nextin, nextout; + int pipefds[2]; /* pipefds[0] is for reading */ + struct child_prog *child; + struct built_in_command *x; + char *p; +# if __GNUC__ + /* Avoid longjmp clobbering */ + (void) &i; + (void) &nextin; + (void) &nextout; + (void) &child; +# endif +#else + int nextin; + int flag = do_repeat ? CMD_FLAG_REPEAT : 0; + struct child_prog *child; + char *p; +# if __GNUC__ + /* Avoid longjmp clobbering */ + (void) &i; + (void) &nextin; + (void) &child; +# endif +#endif /* __U_BOOT__ */ + + nextin = 0; +#ifndef __U_BOOT__ + pi->pgrp = -1; +#endif + + /* Check if this is a simple builtin (not part of a pipe). + * Builtins within pipes have to fork anyway, and are handled in + * pseudo_exec. "echo foo | read bar" doesn't work on bash, either. + */ + if (pi->num_progs == 1) child = & (pi->progs[0]); +#ifndef __U_BOOT__ + if (pi->num_progs == 1 && child->group && child->subshell == 0) { + int squirrel[] = {-1, -1, -1}; + int rcode; + debug_printf("non-subshell grouping\n"); + setup_redirects(child, squirrel); + /* XXX could we merge code with following builtin case, + * by creating a pseudo builtin that calls run_list_real? */ + rcode = run_list_real(child->group); + restore_redirects(squirrel); +#else + if (pi->num_progs == 1 && child->group) { + int rcode; + debug_printf("non-subshell grouping\n"); + rcode = run_list_real(child->group); +#endif + return rcode; + } else if (pi->num_progs == 1 && pi->progs[0].argv != NULL) { + for (i=0; is_assignment(child->argv[i]); i++) { /* nothing */ } + if (i!=0 && child->argv[i]==NULL) { + /* assignments, but no command: set the local environment */ + for (i=0; child->argv[i]!=NULL; i++) { + + /* Ok, this case is tricky. We have to decide if this is a + * local variable, or an already exported variable. If it is + * already exported, we have to export the new value. If it is + * not exported, we need only set this as a local variable. + * This junk is all to decide whether or not to export this + * variable. */ + int export_me=0; + char *name, *value; + name = xstrdup(child->argv[i]); + debug_printf("Local environment set: %s\n", name); + value = strchr(name, '='); + if (value) + *value=0; +#ifndef __U_BOOT__ + if ( get_local_var(name)) { + export_me=1; + } +#endif + free(name); + p = insert_var_value(child->argv[i]); + set_local_var(p, export_me); + if (p != child->argv[i]) free(p); + } + return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */ + } + for (i = 0; is_assignment(child->argv[i]); i++) { + p = insert_var_value(child->argv[i]); +#ifndef __U_BOOT__ + putenv(strdup(p)); +#else + set_local_var(p, 0); +#endif + if (p != child->argv[i]) { + child->sp--; + free(p); + } + } + if (child->sp) { + char * str = NULL; + + str = make_string(child->argv + i, + child->argv_nonnull + i); + parse_string_outer(str, FLAG_EXIT_FROM_LOOP | FLAG_REPARSING); + free(str); + return last_return_code; + } +#ifndef __U_BOOT__ + for (x = bltins; x->cmd; x++) { + if (strcmp(child->argv[i], x->cmd) == 0 ) { + int squirrel[] = {-1, -1, -1}; + int rcode; + if (x->function == builtin_exec && child->argv[i+1]==NULL) { + debug_printf("magic exec\n"); + setup_redirects(child,NULL); + return EXIT_SUCCESS; + } + debug_printf("builtin inline %s\n", child->argv[0]); + /* XXX setup_redirects acts on file descriptors, not FILEs. + * This is perfect for work that comes after exec(). + * Is it really safe for inline use? Experimentally, + * things seem to work with glibc. */ + setup_redirects(child, squirrel); + + child->argv += i; /* XXX horrible hack */ + rcode = x->function(child); + /* XXX restore hack so free() can work right */ + child->argv -= i; + restore_redirects(squirrel); + } + return rcode; + } +#else + /* check ";", because ,example , argv consist from + * "help;flinfo" must not execute + */ + if (strchr(child->argv[i], ';')) { + printf("Unknown command '%s' - try 'help' or use " + "'run' command\n", child->argv[i]); + return -1; + } + /* Process the command */ + return cmd_process(flag, child->argc, child->argv, + &flag_repeat, NULL); +#endif + } +#ifndef __U_BOOT__ + + for (i = 0; i < pi->num_progs; i++) { + child = & (pi->progs[i]); + + /* pipes are inserted between pairs of commands */ + if ((i + 1) < pi->num_progs) { + if (pipe(pipefds)<0) perror_msg_and_die("pipe"); + nextout = pipefds[1]; + } else { + nextout=1; + pipefds[0] = -1; + } + + /* XXX test for failed fork()? */ + if (!(child->pid = fork())) { + /* Set the handling for job control signals back to the default. */ + signal(SIGINT, SIG_DFL); + signal(SIGQUIT, SIG_DFL); + signal(SIGTERM, SIG_DFL); + signal(SIGTSTP, SIG_DFL); + signal(SIGTTIN, SIG_DFL); + signal(SIGTTOU, SIG_DFL); + signal(SIGCHLD, SIG_DFL); + + close_all(); + + if (nextin != 0) { + dup2(nextin, 0); + close(nextin); + } + if (nextout != 1) { + dup2(nextout, 1); + close(nextout); + } + if (pipefds[0]!=-1) { + close(pipefds[0]); /* opposite end of our output pipe */ + } + + /* Like bash, explicit redirects override pipes, + * and the pipe fd is available for dup'ing. */ + setup_redirects(child,NULL); + + if (interactive && pi->followup!=PIPE_BG) { + /* If we (the child) win the race, put ourselves in the process + * group whose leader is the first process in this pipe. */ + if (pi->pgrp < 0) { + pi->pgrp = getpid(); + } + if (setpgid(0, pi->pgrp) == 0) { + tcsetpgrp(2, pi->pgrp); + } + } + + pseudo_exec(child); + } + + + /* put our child in the process group whose leader is the + first process in this pipe */ + if (pi->pgrp < 0) { + pi->pgrp = child->pid; + } + /* Don't check for errors. The child may be dead already, + * in which case setpgid returns error code EACCES. */ + setpgid(child->pid, pi->pgrp); + + if (nextin != 0) + close(nextin); + if (nextout != 1) + close(nextout); + + /* If there isn't another process, nextin is garbage + but it doesn't matter */ + nextin = pipefds[0]; + } +#endif + return -1; +} + +static int run_list_real(struct pipe *pi) +{ + char *save_name = NULL; + char **list = NULL; + char **save_list = NULL; + struct pipe *rpipe; + int flag_rep = 0; +#ifndef __U_BOOT__ + int save_num_progs; +#endif + int rcode=0, flag_skip=1; + int flag_restore = 0; + int if_code=0, next_if_code=0; /* need double-buffer to handle elif */ + reserved_style rmode, skip_more_in_this_rmode=RES_XXXX; + /* check syntax for "for" */ + for (rpipe = pi; rpipe; rpipe = rpipe->next) { + if ((rpipe->r_mode == RES_IN || + rpipe->r_mode == RES_FOR) && + (rpipe->next == NULL)) { + syntax(); +#ifdef __U_BOOT__ + flag_repeat = 0; +#endif + return 1; + } + if ((rpipe->r_mode == RES_IN && + (rpipe->next->r_mode == RES_IN && + rpipe->next->progs->argv != NULL))|| + (rpipe->r_mode == RES_FOR && + rpipe->next->r_mode != RES_IN)) { + syntax(); +#ifdef __U_BOOT__ + flag_repeat = 0; +#endif + return 1; + } + } + for (; pi; pi = (flag_restore != 0) ? rpipe : pi->next) { + if (pi->r_mode == RES_WHILE || pi->r_mode == RES_UNTIL || + pi->r_mode == RES_FOR) { +#ifdef __U_BOOT__ + /* check Ctrl-C */ + ctrlc(); + if ((had_ctrlc())) { + return 1; + } +#endif + flag_restore = 0; + if (!rpipe) { + flag_rep = 0; + rpipe = pi; + } + } + rmode = pi->r_mode; + debug_printf("rmode=%d if_code=%d next_if_code=%d skip_more=%d\n", rmode, if_code, next_if_code, skip_more_in_this_rmode); + if (rmode == skip_more_in_this_rmode && flag_skip) { + if (pi->followup == PIPE_SEQ) flag_skip=0; + continue; + } + flag_skip = 1; + skip_more_in_this_rmode = RES_XXXX; + if (rmode == RES_THEN || rmode == RES_ELSE) if_code = next_if_code; + if (rmode == RES_THEN && if_code) continue; + if (rmode == RES_ELSE && !if_code) continue; + if (rmode == RES_ELIF && !if_code) break; + if (rmode == RES_FOR && pi->num_progs) { + if (!list) { + /* if no variable values after "in" we skip "for" */ + if (!pi->next->progs->argv) continue; + /* create list of variable values */ + list = make_list_in(pi->next->progs->argv, + pi->progs->argv[0]); + save_list = list; + save_name = pi->progs->argv[0]; + pi->progs->argv[0] = NULL; + flag_rep = 1; + } + if (!(*list)) { + free(pi->progs->argv[0]); + free(save_list); + list = NULL; + flag_rep = 0; + pi->progs->argv[0] = save_name; +#ifndef __U_BOOT__ + pi->progs->glob_result.gl_pathv[0] = + pi->progs->argv[0]; +#endif + continue; + } else { + /* insert new value from list for variable */ + if (pi->progs->argv[0]) + free(pi->progs->argv[0]); + pi->progs->argv[0] = *list++; +#ifndef __U_BOOT__ + pi->progs->glob_result.gl_pathv[0] = + pi->progs->argv[0]; +#endif + } + } + if (rmode == RES_IN) continue; + if (rmode == RES_DO) { + if (!flag_rep) continue; + } + if (rmode == RES_DONE) { + if (flag_rep) { + flag_restore = 1; + } else { + rpipe = NULL; + } + } + if (pi->num_progs == 0) continue; +#ifndef __U_BOOT__ + save_num_progs = pi->num_progs; /* save number of programs */ +#endif + rcode = run_pipe_real(pi); + debug_printf("run_pipe_real returned %d\n",rcode); +#ifndef __U_BOOT__ + if (rcode!=-1) { + /* We only ran a builtin: rcode was set by the return value + * of run_pipe_real(), and we don't need to wait for anything. */ + } else if (pi->followup==PIPE_BG) { + /* XXX check bash's behavior with nontrivial pipes */ + /* XXX compute jobid */ + /* XXX what does bash do with attempts to background builtins? */ + insert_bg_job(pi); + rcode = EXIT_SUCCESS; + } else { + if (interactive) { + /* move the new process group into the foreground */ + if (tcsetpgrp(shell_terminal, pi->pgrp) && errno != ENOTTY) + perror_msg("tcsetpgrp-3"); + rcode = checkjobs(pi); + /* move the shell to the foreground */ + if (tcsetpgrp(shell_terminal, getpgid(0)) && errno != ENOTTY) + perror_msg("tcsetpgrp-4"); + } else { + rcode = checkjobs(pi); + } + debug_printf("checkjobs returned %d\n",rcode); + } + last_return_code=rcode; +#else + if (rcode < -1) { + last_return_code = -rcode - 2; + return -2; /* exit */ + } + last_return_code=(rcode == 0) ? 0 : 1; +#endif +#ifndef __U_BOOT__ + pi->num_progs = save_num_progs; /* restore number of programs */ +#endif + if ( rmode == RES_IF || rmode == RES_ELIF ) + next_if_code=rcode; /* can be overwritten a number of times */ + if (rmode == RES_WHILE) + flag_rep = !last_return_code; + if (rmode == RES_UNTIL) + flag_rep = last_return_code; + if ( (rcode==EXIT_SUCCESS && pi->followup==PIPE_OR) || + (rcode!=EXIT_SUCCESS && pi->followup==PIPE_AND) ) + skip_more_in_this_rmode=rmode; +#ifndef __U_BOOT__ + checkjobs(NULL); +#endif + } + return rcode; +} + +/* broken, of course, but OK for testing */ +static char *indenter(int i) +{ + static char blanks[]=" "; + return &blanks[sizeof(blanks)-i-1]; +} + +/* return code is the exit status of the pipe */ +static int free_pipe(struct pipe *pi, int indent) +{ + char **p; + struct child_prog *child; +#ifndef __U_BOOT__ + struct redir_struct *r, *rnext; +#endif + int a, i, ret_code=0; + char *ind = indenter(indent); + +#ifndef __U_BOOT__ + if (pi->stopped_progs > 0) + return ret_code; + final_printf("%s run pipe: (pid %d)\n",ind,getpid()); +#endif + for (i=0; i<pi->num_progs; i++) { + child = &pi->progs[i]; + final_printf("%s command %d:\n",ind,i); + if (child->argv) { + for (a=0,p=child->argv; *p; a++,p++) { + final_printf("%s argv[%d] = %s\n",ind,a,*p); + } +#ifndef __U_BOOT__ + globfree(&child->glob_result); +#else + for (a = 0; a < child->argc; a++) { + free(child->argv[a]); + } + free(child->argv); + free(child->argv_nonnull); + child->argc = 0; +#endif + child->argv=NULL; + } else if (child->group) { +#ifndef __U_BOOT__ + final_printf("%s begin group (subshell:%d)\n",ind, child->subshell); +#endif + ret_code = free_pipe_list(child->group,indent+3); + final_printf("%s end group\n",ind); + } else { + final_printf("%s (nil)\n",ind); + } +#ifndef __U_BOOT__ + for (r=child->redirects; r; r=rnext) { + final_printf("%s redirect %d%s", ind, r->fd, redir_table[r->type].descrip); + if (r->dup == -1) { + /* guard against the case >$FOO, where foo is unset or blank */ + if (r->word.gl_pathv) { + final_printf(" %s\n", *r->word.gl_pathv); + globfree(&r->word); + } + } else { + final_printf("&%d\n", r->dup); + } + rnext=r->next; + free(r); + } + child->redirects=NULL; +#endif + } + free(pi->progs); /* children are an array, they get freed all at once */ + pi->progs=NULL; + return ret_code; +} + +static int free_pipe_list(struct pipe *head, int indent) +{ + int rcode=0; /* if list has no members */ + struct pipe *pi, *next; + char *ind = indenter(indent); + for (pi=head; pi; pi=next) { + final_printf("%s pipe reserved mode %d\n", ind, pi->r_mode); + rcode = free_pipe(pi, indent); + final_printf("%s pipe followup code %d\n", ind, pi->followup); + next=pi->next; + pi->next=NULL; + free(pi); + } + return rcode; +} + +/* Select which version we will use */ +static int run_list(struct pipe *pi) +{ + int rcode=0; +#ifndef __U_BOOT__ + if (fake_mode==0) { +#endif + rcode = run_list_real(pi); +#ifndef __U_BOOT__ + } +#endif + /* free_pipe_list has the side effect of clearing memory + * In the long run that function can be merged with run_list_real, + * but doing that now would hobble the debugging effort. */ + free_pipe_list(pi,0); + return rcode; +} + +/* The API for glob is arguably broken. This routine pushes a non-matching + * string into the output structure, removing non-backslashed backslashes. + * If someone can prove me wrong, by performing this function within the + * original glob(3) api, feel free to rewrite this routine into oblivion. + * Return code (0 vs. GLOB_NOSPACE) matches glob(3). + * XXX broken if the last character is '\\', check that before calling. + */ +#ifndef __U_BOOT__ +static int globhack(const char *src, int flags, glob_t *pglob) +{ + int cnt=0, pathc; + const char *s; + char *dest; + for (cnt=1, s=src; s && *s; s++) { + if (*s == '\\') s++; + cnt++; + } + dest = malloc(cnt); + if (!dest) return GLOB_NOSPACE; + if (!(flags & GLOB_APPEND)) { + pglob->gl_pathv=NULL; + pglob->gl_pathc=0; + pglob->gl_offs=0; + pglob->gl_offs=0; + } + pathc = ++pglob->gl_pathc; + pglob->gl_pathv = realloc(pglob->gl_pathv, (pathc+1)*sizeof(*pglob->gl_pathv)); + if (pglob->gl_pathv == NULL) return GLOB_NOSPACE; + pglob->gl_pathv[pathc-1]=dest; + pglob->gl_pathv[pathc]=NULL; + for (s=src; s && *s; s++, dest++) { + if (*s == '\\') s++; + *dest = *s; + } + *dest='\0'; + return 0; +} + +/* XXX broken if the last character is '\\', check that before calling */ +static int glob_needed(const char *s) +{ + for (; *s; s++) { + if (*s == '\\') s++; + if (strchr("*[?",*s)) return 1; + } + return 0; +} + +#if 0 +static void globprint(glob_t *pglob) +{ + int i; + debug_printf("glob_t at %p:\n", pglob); + debug_printf(" gl_pathc=%d gl_pathv=%p gl_offs=%d gl_flags=%d\n", + pglob->gl_pathc, pglob->gl_pathv, pglob->gl_offs, pglob->gl_flags); + for (i=0; i<pglob->gl_pathc; i++) + debug_printf("pglob->gl_pathv[%d] = %p = %s\n", i, + pglob->gl_pathv[i], pglob->gl_pathv[i]); +} +#endif + +static int xglob(o_string *dest, int flags, glob_t *pglob) +{ + int gr; + + /* short-circuit for null word */ + /* we can code this better when the debug_printf's are gone */ + if (dest->length == 0) { + if (dest->nonnull) { + /* bash man page calls this an "explicit" null */ + gr = globhack(dest->data, flags, pglob); + debug_printf("globhack returned %d\n",gr); + } else { + return 0; + } + } else if (glob_needed(dest->data)) { + gr = glob(dest->data, flags, NULL, pglob); + debug_printf("glob returned %d\n",gr); + if (gr == GLOB_NOMATCH) { + /* quote removal, or more accurately, backslash removal */ + gr = globhack(dest->data, flags, pglob); + debug_printf("globhack returned %d\n",gr); + } + } else { + gr = globhack(dest->data, flags, pglob); + debug_printf("globhack returned %d\n",gr); + } + if (gr == GLOB_NOSPACE) + error_msg_and_die("out of memory during glob"); + if (gr != 0) { /* GLOB_ABORTED ? */ + error_msg("glob(3) error %d",gr); + } + /* globprint(glob_target); */ + return gr; +} +#endif + +#ifdef __U_BOOT__ +static char *get_dollar_var(char ch); +#endif + +/* This is used to get/check local shell variables */ +char *get_local_var(const char *s) +{ + struct variables *cur; + + if (!s) + return NULL; + +#ifdef __U_BOOT__ + if (*s == '$') + return get_dollar_var(s[1]); +#endif + + for (cur = top_vars; cur; cur=cur->next) + if(strcmp(cur->name, s)==0) + return cur->value; + return NULL; +} + +/* This is used to set local shell variables + flg_export==0 if only local (not exporting) variable + flg_export==1 if "new" exporting environ + flg_export>1 if current startup environ (not call putenv()) */ +int set_local_var(const char *s, int flg_export) +{ + char *name, *value; + int result=0; + struct variables *cur; + +#ifdef __U_BOOT__ + /* might be possible! */ + if (!isalpha(*s)) + return -1; +#endif + + name=strdup(s); + +#ifdef __U_BOOT__ + if (getenv(name) != NULL) { + printf ("ERROR: " + "There is a global environment variable with the same name.\n"); + free(name); + return -1; + } +#endif + /* Assume when we enter this function that we are already in + * NAME=VALUE format. So the first order of business is to + * split 's' on the '=' into 'name' and 'value' */ + value = strchr(name, '='); + if (value == NULL && ++value == NULL) { + free(name); + return -1; + } + *value++ = 0; + + for(cur = top_vars; cur; cur = cur->next) { + if(strcmp(cur->name, name)==0) + break; + } + + if(cur) { + if(strcmp(cur->value, value)==0) { + if(flg_export>0 && cur->flg_export==0) + cur->flg_export=flg_export; + else + result++; + } else { + if(cur->flg_read_only) { + error_msg("%s: readonly variable", name); + result = -1; + } else { + if(flg_export>0 || cur->flg_export>1) + cur->flg_export=1; + free(cur->value); + + cur->value = strdup(value); + } + } + } else { + cur = malloc(sizeof(struct variables)); + if(!cur) { + result = -1; + } else { + cur->name = strdup(name); + if (cur->name == NULL) { + free(cur); + result = -1; + } else { + struct variables *bottom = top_vars; + cur->value = strdup(value); + cur->next = NULL; + cur->flg_export = flg_export; + cur->flg_read_only = 0; + while(bottom->next) bottom=bottom->next; + bottom->next = cur; + } + } + } + +#ifndef __U_BOOT__ + if(result==0 && cur->flg_export==1) { + *(value-1) = '='; + result = putenv(name); + } else { +#endif + free(name); +#ifndef __U_BOOT__ + if(result>0) /* equivalent to previous set */ + result = 0; + } +#endif + return result; +} + +void unset_local_var(const char *name) +{ + struct variables *cur; + + if (name) { + for (cur = top_vars; cur; cur=cur->next) { + if(strcmp(cur->name, name)==0) + break; + } + if (cur != NULL) { + struct variables *next = top_vars; + if(cur->flg_read_only) { + error_msg("%s: readonly variable", name); + return; + } else { +#ifndef __U_BOOT__ + if(cur->flg_export) + unsetenv(cur->name); +#endif + free(cur->name); + free(cur->value); + while (next->next != cur) + next = next->next; + next->next = cur->next; + } + free(cur); + } + } +} + +static int is_assignment(const char *s) +{ + if (s == NULL) + return 0; + + if (!isalpha(*s)) return 0; + ++s; + while(isalnum(*s) || *s=='_') ++s; + return *s=='='; +} + +#ifndef __U_BOOT__ +/* the src parameter allows us to peek forward to a possible &n syntax + * for file descriptor duplication, e.g., "2>&1". + * Return code is 0 normally, 1 if a syntax error is detected in src. + * Resource errors (in xmalloc) cause the process to exit */ +static int setup_redirect(struct p_context *ctx, int fd, redir_type style, + struct in_str *input) +{ + struct child_prog *child=ctx->child; + struct redir_struct *redir = child->redirects; + struct redir_struct *last_redir=NULL; + + /* Create a new redir_struct and drop it onto the end of the linked list */ + while(redir) { + last_redir=redir; + redir=redir->next; + } + redir = xmalloc(sizeof(struct redir_struct)); + redir->next=NULL; + redir->word.gl_pathv=NULL; + if (last_redir) { + last_redir->next=redir; + } else { + child->redirects=redir; + } + + redir->type=style; + redir->fd= (fd==-1) ? redir_table[style].default_fd : fd ; + + debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip); + + /* Check for a '2>&1' type redirect */ + redir->dup = redirect_dup_num(input); + if (redir->dup == -2) return 1; /* syntax error */ + if (redir->dup != -1) { + /* Erik had a check here that the file descriptor in question + * is legit; I postpone that to "run time" + * A "-" representation of "close me" shows up as a -3 here */ + debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup); + } else { + /* We do _not_ try to open the file that src points to, + * since we need to return and let src be expanded first. + * Set ctx->pending_redirect, so we know what to do at the + * end of the next parsed word. + */ + ctx->pending_redirect = redir; + } + return 0; +} +#endif + +static struct pipe *new_pipe(void) +{ + struct pipe *pi; + pi = xmalloc(sizeof(struct pipe)); + pi->num_progs = 0; + pi->progs = NULL; + pi->next = NULL; + pi->followup = 0; /* invalid */ + pi->r_mode = RES_NONE; + return pi; +} + +static void initialize_context(struct p_context *ctx) +{ + ctx->pipe=NULL; +#ifndef __U_BOOT__ + ctx->pending_redirect=NULL; +#endif + ctx->child=NULL; + ctx->list_head=new_pipe(); + ctx->pipe=ctx->list_head; + ctx->w=RES_NONE; + ctx->stack=NULL; +#ifdef __U_BOOT__ + ctx->old_flag=0; +#endif + done_command(ctx); /* creates the memory for working child */ +} + +/* normal return is 0 + * if a reserved word is found, and processed, return 1 + * should handle if, then, elif, else, fi, for, while, until, do, done. + * case, function, and select are obnoxious, save those for later. + */ +struct reserved_combo { + char *literal; + int code; + long flag; +}; +/* Mostly a list of accepted follow-up reserved words. + * FLAG_END means we are done with the sequence, and are ready + * to turn the compound list into a command. + * FLAG_START means the word must start a new compound list. + */ +static struct reserved_combo reserved_list[] = { + { "if", RES_IF, FLAG_THEN | FLAG_START }, + { "then", RES_THEN, FLAG_ELIF | FLAG_ELSE | FLAG_FI }, + { "elif", RES_ELIF, FLAG_THEN }, + { "else", RES_ELSE, FLAG_FI }, + { "fi", RES_FI, FLAG_END }, + { "for", RES_FOR, FLAG_IN | FLAG_START }, + { "while", RES_WHILE, FLAG_DO | FLAG_START }, + { "until", RES_UNTIL, FLAG_DO | FLAG_START }, + { "in", RES_IN, FLAG_DO }, + { "do", RES_DO, FLAG_DONE }, + { "done", RES_DONE, FLAG_END } +}; +#define NRES (sizeof(reserved_list)/sizeof(struct reserved_combo)) + +static int reserved_word(o_string *dest, struct p_context *ctx) +{ + struct reserved_combo *r; + for (r=reserved_list; + r<reserved_list+NRES; r++) { + if (strcmp(dest->data, r->literal) == 0) { + debug_printf("found reserved word %s, code %d\n",r->literal,r->code); + if (r->flag & FLAG_START) { + struct p_context *new = xmalloc(sizeof(struct p_context)); + debug_printf("push stack\n"); + if (ctx->w == RES_IN || ctx->w == RES_FOR) { + syntax(); + free(new); + ctx->w = RES_SNTX; + b_reset(dest); + return 1; + } + *new = *ctx; /* physical copy */ + initialize_context(ctx); + ctx->stack=new; + } else if ( ctx->w == RES_NONE || ! (ctx->old_flag & (1<<r->code))) { + syntax(); + ctx->w = RES_SNTX; + b_reset(dest); + return 1; + } + ctx->w=r->code; + ctx->old_flag = r->flag; + if (ctx->old_flag & FLAG_END) { + struct p_context *old; + debug_printf("pop stack\n"); + done_pipe(ctx,PIPE_SEQ); + old = ctx->stack; + old->child->group = ctx->list_head; +#ifndef __U_BOOT__ + old->child->subshell = 0; +#endif + *ctx = *old; /* physical copy */ + free(old); + } + b_reset (dest); + return 1; + } + } + return 0; +} + +/* normal return is 0. + * Syntax or xglob errors return 1. */ +static int done_word(o_string *dest, struct p_context *ctx) +{ + struct child_prog *child=ctx->child; +#ifndef __U_BOOT__ + glob_t *glob_target; + int gr, flags = 0; +#else + char *str, *s; + int argc, cnt; +#endif + + debug_printf("done_word: %s %p\n", dest->data, child); + if (dest->length == 0 && !dest->nonnull) { + debug_printf(" true null, ignored\n"); + return 0; + } +#ifndef __U_BOOT__ + if (ctx->pending_redirect) { + glob_target = &ctx->pending_redirect->word; + } else { +#endif + if (child->group) { + syntax(); + return 1; /* syntax error, groups and arglists don't mix */ + } + if (!child->argv && (ctx->type & FLAG_PARSE_SEMICOLON)) { + debug_printf("checking %s for reserved-ness\n",dest->data); + if (reserved_word(dest,ctx)) return ctx->w==RES_SNTX; + } +#ifndef __U_BOOT__ + glob_target = &child->glob_result; + if (child->argv) flags |= GLOB_APPEND; +#else + for (cnt = 1, s = dest->data; s && *s; s++) { + if (*s == '\\') s++; + cnt++; + } + str = malloc(cnt); + if (!str) return 1; + if ( child->argv == NULL) { + child->argc=0; + } + argc = ++child->argc; + child->argv = realloc(child->argv, (argc+1)*sizeof(*child->argv)); + if (child->argv == NULL) return 1; + child->argv_nonnull = realloc(child->argv_nonnull, + (argc+1)*sizeof(*child->argv_nonnull)); + if (child->argv_nonnull == NULL) + return 1; + child->argv[argc-1]=str; + child->argv_nonnull[argc-1] = dest->nonnull; + child->argv[argc]=NULL; + child->argv_nonnull[argc] = 0; + for (s = dest->data; s && *s; s++,str++) { + if (*s == '\\') s++; + *str = *s; + } + *str = '\0'; +#endif +#ifndef __U_BOOT__ + } + gr = xglob(dest, flags, glob_target); + if (gr != 0) return 1; +#endif + + b_reset(dest); +#ifndef __U_BOOT__ + if (ctx->pending_redirect) { + ctx->pending_redirect=NULL; + if (glob_target->gl_pathc != 1) { + error_msg("ambiguous redirect"); + return 1; + } + } else { + child->argv = glob_target->gl_pathv; + } +#endif + if (ctx->w == RES_FOR) { + done_word(dest,ctx); + done_pipe(ctx,PIPE_SEQ); + } + return 0; +} + +/* The only possible error here is out of memory, in which case + * xmalloc exits. */ +static int done_command(struct p_context *ctx) +{ + /* The child is really already in the pipe structure, so + * advance the pipe counter and make a new, null child. + * Only real trickiness here is that the uncommitted + * child structure, to which ctx->child points, is not + * counted in pi->num_progs. */ + struct pipe *pi=ctx->pipe; + struct child_prog *prog=ctx->child; + + if (prog && prog->group == NULL + && prog->argv == NULL +#ifndef __U_BOOT__ + && prog->redirects == NULL) { +#else + ) { +#endif + debug_printf("done_command: skipping null command\n"); + return 0; + } else if (prog) { + pi->num_progs++; + debug_printf("done_command: num_progs incremented to %d\n",pi->num_progs); + } else { + debug_printf("done_command: initializing\n"); + } + pi->progs = xrealloc(pi->progs, sizeof(*pi->progs) * (pi->num_progs+1)); + + prog = pi->progs + pi->num_progs; +#ifndef __U_BOOT__ + prog->redirects = NULL; +#endif + prog->argv = NULL; + prog->argv_nonnull = NULL; +#ifndef __U_BOOT__ + prog->is_stopped = 0; +#endif + prog->group = NULL; +#ifndef __U_BOOT__ + prog->glob_result.gl_pathv = NULL; + prog->family = pi; +#endif + prog->sp = 0; + ctx->child = prog; + prog->type = ctx->type; + + /* but ctx->pipe and ctx->list_head remain unchanged */ + return 0; +} + +static int done_pipe(struct p_context *ctx, pipe_style type) +{ + struct pipe *new_p; + done_command(ctx); /* implicit closure of previous command */ + debug_printf("done_pipe, type %d\n", type); + ctx->pipe->followup = type; + ctx->pipe->r_mode = ctx->w; + new_p=new_pipe(); + ctx->pipe->next = new_p; + ctx->pipe = new_p; + ctx->child = NULL; + done_command(ctx); /* set up new pipe to accept commands */ + return 0; +} + +#ifndef __U_BOOT__ +/* peek ahead in the in_str to find out if we have a "&n" construct, + * as in "2>&1", that represents duplicating a file descriptor. + * returns either -2 (syntax error), -1 (no &), or the number found. + */ +static int redirect_dup_num(struct in_str *input) +{ + int ch, d=0, ok=0; + ch = b_peek(input); + if (ch != '&') return -1; + + b_getch(input); /* get the & */ + ch=b_peek(input); + if (ch == '-') { + b_getch(input); + return -3; /* "-" represents "close me" */ + } + while (isdigit(ch)) { + d = d*10+(ch-'0'); + ok=1; + b_getch(input); + ch = b_peek(input); + } + if (ok) return d; + + error_msg("ambiguous redirect"); + return -2; +} + +/* If a redirect is immediately preceded by a number, that number is + * supposed to tell which file descriptor to redirect. This routine + * looks for such preceding numbers. In an ideal world this routine + * needs to handle all the following classes of redirects... + * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo + * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo + * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo + * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo + * A -1 output from this program means no valid number was found, so the + * caller should use the appropriate default for this redirection. + */ +static int redirect_opt_num(o_string *o) +{ + int num; + + if (o->length==0) return -1; + for(num=0; num<o->length; num++) { + if (!isdigit(*(o->data+num))) { + return -1; + } + } + /* reuse num (and save an int) */ + num=atoi(o->data); + b_reset(o); + return num; +} + +FILE *generate_stream_from_list(struct pipe *head) +{ + FILE *pf; +#if 1 + int pid, channel[2]; + if (pipe(channel)<0) perror_msg_and_die("pipe"); + pid=fork(); + if (pid<0) { + perror_msg_and_die("fork"); + } else if (pid==0) { + close(channel[0]); + if (channel[1] != 1) { + dup2(channel[1],1); + close(channel[1]); + } +#if 0 +#define SURROGATE "surrogate response" + write(1,SURROGATE,sizeof(SURROGATE)); + _exit(run_list(head)); +#else + _exit(run_list_real(head)); /* leaks memory */ +#endif + } + debug_printf("forked child %d\n",pid); + close(channel[1]); + pf = fdopen(channel[0],"r"); + debug_printf("pipe on FILE *%p\n",pf); +#else + free_pipe_list(head,0); + pf=popen("echo surrogate response","r"); + debug_printf("started fake pipe on FILE *%p\n",pf); +#endif + return pf; +} + +/* this version hacked for testing purposes */ +/* return code is exit status of the process that is run. */ +static int process_command_subs(o_string *dest, struct p_context *ctx, struct in_str *input, int subst_end) +{ + int retcode; + o_string result=NULL_O_STRING; + struct p_context inner; + FILE *p; + struct in_str pipe_str; + initialize_context(&inner); + + /* recursion to generate command */ + retcode = parse_stream(&result, &inner, input, subst_end); + if (retcode != 0) return retcode; /* syntax error or EOF */ + done_word(&result, &inner); + done_pipe(&inner, PIPE_SEQ); + b_free(&result); + + p=generate_stream_from_list(inner.list_head); + if (p==NULL) return 1; + mark_open(fileno(p)); + setup_file_in_str(&pipe_str, p); + + /* now send results of command back into original context */ + retcode = parse_stream(dest, ctx, &pipe_str, '\0'); + /* XXX In case of a syntax error, should we try to kill the child? + * That would be tough to do right, so just read until EOF. */ + if (retcode == 1) { + while (b_getch(&pipe_str)!=EOF) { /* discard */ }; + } + + debug_printf("done reading from pipe, pclose()ing\n"); + /* This is the step that wait()s for the child. Should be pretty + * safe, since we just read an EOF from its stdout. We could try + * to better, by using wait(), and keeping track of background jobs + * at the same time. That would be a lot of work, and contrary + * to the KISS philosophy of this program. */ + mark_closed(fileno(p)); + retcode=pclose(p); + free_pipe_list(inner.list_head,0); + debug_printf("pclosed, retcode=%d\n",retcode); + /* XXX this process fails to trim a single trailing newline */ + return retcode; +} + +static int parse_group(o_string *dest, struct p_context *ctx, + struct in_str *input, int ch) +{ + int rcode, endch=0; + struct p_context sub; + struct child_prog *child = ctx->child; + if (child->argv) { + syntax(); + return 1; /* syntax error, groups and arglists don't mix */ + } + initialize_context(&sub); + switch(ch) { + case '(': endch=')'; child->subshell=1; break; + case '{': endch='}'; break; + default: syntax(); /* really logic error */ + } + rcode=parse_stream(dest,&sub,input,endch); + done_word(dest,&sub); /* finish off the final word in the subcontext */ + done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */ + child->group = sub.list_head; + return rcode; + /* child remains "open", available for possible redirects */ +} +#endif + +/* basically useful version until someone wants to get fancier, + * see the bash man page under "Parameter Expansion" */ +static char *lookup_param(char *src) +{ + char *p; + char *sep; + char *default_val = NULL; + int assign = 0; + int expand_empty = 0; + + if (!src) + return NULL; + + sep = strchr(src, ':'); + + if (sep) { + *sep = '\0'; + if (*(sep + 1) == '-') + default_val = sep+2; + if (*(sep + 1) == '=') { + default_val = sep+2; + assign = 1; + } + if (*(sep + 1) == '+') { + default_val = sep+2; + expand_empty = 1; + } + } + + p = getenv(src); + if (!p) + p = get_local_var(src); + + if (!p || strlen(p) == 0) { + p = default_val; + if (assign) { + char *var = malloc(strlen(src)+strlen(default_val)+2); + if (var) { + sprintf(var, "%s=%s", src, default_val); + set_local_var(var, 0); + } + free(var); + } + } else if (expand_empty) { + p += strlen(p); + } + + if (sep) + *sep = ':'; + + return p; +} + +#ifdef __U_BOOT__ +static char *get_dollar_var(char ch) +{ + static char buf[40]; + + buf[0] = '\0'; + switch (ch) { + case '?': + sprintf(buf, "%u", (unsigned int)last_return_code); + break; + default: + return NULL; + } + return buf; +} +#endif + +/* return code: 0 for OK, 1 for syntax error */ +static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *input) +{ +#ifndef __U_BOOT__ + int i, advance=0; +#else + int advance=0; +#endif +#ifndef __U_BOOT__ + char sep[]=" "; +#endif + int ch = input->peek(input); /* first character after the $ */ + debug_printf("handle_dollar: ch=%c\n",ch); + if (isalpha(ch)) { + b_addchr(dest, SPECIAL_VAR_SYMBOL); + ctx->child->sp++; + while(ch=b_peek(input),isalnum(ch) || ch=='_') { + b_getch(input); + b_addchr(dest,ch); + } + b_addchr(dest, SPECIAL_VAR_SYMBOL); +#ifndef __U_BOOT__ + } else if (isdigit(ch)) { + i = ch-'0'; /* XXX is $0 special? */ + if (i<global_argc) { + parse_string(dest, ctx, global_argv[i]); /* recursion */ + } + advance = 1; +#endif + } else switch (ch) { +#ifndef __U_BOOT__ + case '$': + b_adduint(dest,getpid()); + advance = 1; + break; + case '!': + if (last_bg_pid > 0) b_adduint(dest, last_bg_pid); + advance = 1; + break; +#endif + case '?': +#ifndef __U_BOOT__ + b_adduint(dest,last_return_code); +#else + ctx->child->sp++; + b_addchr(dest, SPECIAL_VAR_SYMBOL); + b_addchr(dest, '$'); + b_addchr(dest, '?'); + b_addchr(dest, SPECIAL_VAR_SYMBOL); +#endif + advance = 1; + break; +#ifndef __U_BOOT__ + case '#': + b_adduint(dest,global_argc ? global_argc-1 : 0); + advance = 1; + break; +#endif + case '{': + b_addchr(dest, SPECIAL_VAR_SYMBOL); + ctx->child->sp++; + b_getch(input); + /* XXX maybe someone will try to escape the '}' */ + while(ch=b_getch(input),ch!=EOF && ch!='}') { + b_addchr(dest,ch); + } + if (ch != '}') { + syntax(); + return 1; + } + b_addchr(dest, SPECIAL_VAR_SYMBOL); + break; +#ifndef __U_BOOT__ + case '(': + b_getch(input); + process_command_subs(dest, ctx, input, ')'); + break; + case '*': + sep[0]=ifs[0]; + for (i=1; i<global_argc; i++) { + parse_string(dest, ctx, global_argv[i]); + if (i+1 < global_argc) parse_string(dest, ctx, sep); + } + break; + case '@': + case '-': + case '_': + /* still unhandled, but should be eventually */ + error_msg("unhandled syntax: $%c",ch); + return 1; + break; +#endif + default: + b_addqchr(dest,'$',dest->quote); + } + /* Eat the character if the flag was set. If the compiler + * is smart enough, we could substitute "b_getch(input);" + * for all the "advance = 1;" above, and also end up with + * a nice size-optimized program. Hah! That'll be the day. + */ + if (advance) b_getch(input); + return 0; +} + +#ifndef __U_BOOT__ +int parse_string(o_string *dest, struct p_context *ctx, const char *src) +{ + struct in_str foo; + setup_string_in_str(&foo, src); + return parse_stream(dest, ctx, &foo, '\0'); +} +#endif + +/* return code is 0 for normal exit, 1 for syntax error */ +static int parse_stream(o_string *dest, struct p_context *ctx, + struct in_str *input, int end_trigger) +{ + unsigned int ch, m; +#ifndef __U_BOOT__ + int redir_fd; + redir_type redir_style; +#endif + int next; + + /* Only double-quote state is handled in the state variable dest->quote. + * A single-quote triggers a bypass of the main loop until its mate is + * found. When recursing, quote state is passed in via dest->quote. */ + + debug_printf("parse_stream, end_trigger=%d\n",end_trigger); + while ((ch=b_getch(input))!=EOF) { + m = map[ch]; +#ifdef __U_BOOT__ + if (input->__promptme == 0) return 1; +#endif + next = (ch == '\n') ? 0 : b_peek(input); + + debug_printf("parse_stream: ch=%c (%d) m=%d quote=%d - %c\n", + ch >= ' ' ? ch : '.', ch, m, + dest->quote, ctx->stack == NULL ? '*' : '.'); + + if (m==0 || ((m==1 || m==2) && dest->quote)) { + b_addqchr(dest, ch, dest->quote); + } else { + if (m==2) { /* unquoted IFS */ + if (done_word(dest, ctx)) { + return 1; + } + /* If we aren't performing a substitution, treat a newline as a + * command separator. */ + if (end_trigger != '\0' && ch=='\n') + done_pipe(ctx,PIPE_SEQ); + } + if (ch == end_trigger && !dest->quote && ctx->w==RES_NONE) { + debug_printf("leaving parse_stream (triggered)\n"); + return 0; + } +#if 0 + if (ch=='\n') { + /* Yahoo! Time to run with it! */ + done_pipe(ctx,PIPE_SEQ); + run_list(ctx->list_head); + initialize_context(ctx); + } +#endif + if (m!=2) switch (ch) { + case '#': + if (dest->length == 0 && !dest->quote) { + while(ch=b_peek(input),ch!=EOF && ch!='\n') { b_getch(input); } + } else { + b_addqchr(dest, ch, dest->quote); + } + break; + case '\\': + if (next == EOF) { + syntax(); + return 1; + } + b_addqchr(dest, '\\', dest->quote); + b_addqchr(dest, b_getch(input), dest->quote); + break; + case '$': + if (handle_dollar(dest, ctx, input)!=0) return 1; + break; + case '\'': + dest->nonnull = 1; + while(ch=b_getch(input),ch!=EOF && ch!='\'') { +#ifdef __U_BOOT__ + if(input->__promptme == 0) return 1; +#endif + b_addchr(dest,ch); + } + if (ch==EOF) { + syntax(); + return 1; + } + break; + case '"': + dest->nonnull = 1; + dest->quote = !dest->quote; + break; +#ifndef __U_BOOT__ + case '`': + process_command_subs(dest, ctx, input, '`'); + break; + case '>': + redir_fd = redirect_opt_num(dest); + done_word(dest, ctx); + redir_style=REDIRECT_OVERWRITE; + if (next == '>') { + redir_style=REDIRECT_APPEND; + b_getch(input); + } else if (next == '(') { + syntax(); /* until we support >(list) Process Substitution */ + return 1; + } + setup_redirect(ctx, redir_fd, redir_style, input); + break; + case '<': + redir_fd = redirect_opt_num(dest); + done_word(dest, ctx); + redir_style=REDIRECT_INPUT; + if (next == '<') { + redir_style=REDIRECT_HEREIS; + b_getch(input); + } else if (next == '>') { + redir_style=REDIRECT_IO; + b_getch(input); + } else if (next == '(') { + syntax(); /* until we support <(list) Process Substitution */ + return 1; + } + setup_redirect(ctx, redir_fd, redir_style, input); + break; +#endif + case ';': + done_word(dest, ctx); + done_pipe(ctx,PIPE_SEQ); + break; + case '&': + done_word(dest, ctx); + if (next=='&') { + b_getch(input); + done_pipe(ctx,PIPE_AND); + } else { +#ifndef __U_BOOT__ + done_pipe(ctx,PIPE_BG); +#else + syntax_err(); + return 1; +#endif + } + break; + case '|': + done_word(dest, ctx); + if (next=='|') { + b_getch(input); + done_pipe(ctx,PIPE_OR); + } else { + /* we could pick up a file descriptor choice here + * with redirect_opt_num(), but bash doesn't do it. + * "echo foo 2| cat" yields "foo 2". */ +#ifndef __U_BOOT__ + done_command(ctx); +#else + syntax_err(); + return 1; +#endif + } + break; +#ifndef __U_BOOT__ + case '(': + case '{': + if (parse_group(dest, ctx, input, ch)!=0) return 1; + break; + case ')': + case '}': + syntax(); /* Proper use of this character caught by end_trigger */ + return 1; + break; +#endif + case SUBSTED_VAR_SYMBOL: + dest->nonnull = 1; + while (ch = b_getch(input), ch != EOF && + ch != SUBSTED_VAR_SYMBOL) { + debug_printf("subst, pass=%d\n", ch); + if (input->__promptme == 0) + return 1; + b_addchr(dest, ch); + } + debug_printf("subst, term=%d\n", ch); + if (ch == EOF) { + syntax(); + return 1; + } + break; + default: + syntax(); /* this is really an internal logic error */ + return 1; + } + } + } + /* complain if quote? No, maybe we just finished a command substitution + * that was quoted. Example: + * $ echo "`cat foo` plus more" + * and we just got the EOF generated by the subshell that ran "cat foo" + * The only real complaint is if we got an EOF when end_trigger != '\0', + * that is, we were really supposed to get end_trigger, and never got + * one before the EOF. Can't use the standard "syntax error" return code, + * so that parse_stream_outer can distinguish the EOF and exit smoothly. */ + debug_printf("leaving parse_stream (EOF)\n"); + if (end_trigger != '\0') return -1; + return 0; +} + +static void mapset(const unsigned char *set, int code) +{ + const unsigned char *s; + for (s=set; *s; s++) map[*s] = code; +} + +static void update_ifs_map(void) +{ + /* char *ifs and char map[256] are both globals. */ + ifs = (uchar *)getenv("IFS"); + if (ifs == NULL) ifs=(uchar *)" \t\n"; + /* Precompute a list of 'flow through' behavior so it can be treated + * quickly up front. Computation is necessary because of IFS. + * Special case handling of IFS == " \t\n" is not implemented. + * The map[] array only really needs two bits each, and on most machines + * that would be faster because of the reduced L1 cache footprint. + */ + memset(map,0,sizeof(map)); /* most characters flow through always */ +#ifndef __U_BOOT__ + mapset((uchar *)"\\$'\"`", 3); /* never flow through */ + mapset((uchar *)"<>;&|(){}#", 1); /* flow through if quoted */ +#else + { + uchar subst[2] = {SUBSTED_VAR_SYMBOL, 0}; + mapset(subst, 3); /* never flow through */ + } + mapset((uchar *)"\\$'\"", 3); /* never flow through */ + mapset((uchar *)";&|#", 1); /* flow through if quoted */ +#endif + mapset(ifs, 2); /* also flow through if quoted */ +} + +/* most recursion does not come through here, the exeception is + * from builtin_source() */ +static int parse_stream_outer(struct in_str *inp, int flag) +{ + + struct p_context ctx; + o_string temp=NULL_O_STRING; + int rcode; +#ifdef __U_BOOT__ + int code = 0; +#endif + do { + ctx.type = flag; + initialize_context(&ctx); + update_ifs_map(); + if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING)) mapset((uchar *)";$&|", 0); + inp->promptmode=1; + rcode = parse_stream(&temp, &ctx, inp, '\n'); +#ifdef __U_BOOT__ + if (rcode == 1) flag_repeat = 0; +#endif + if (rcode != 1 && ctx.old_flag != 0) { + syntax(); +#ifdef __U_BOOT__ + flag_repeat = 0; +#endif + } + if (rcode != 1 && ctx.old_flag == 0) { + done_word(&temp, &ctx); + done_pipe(&ctx,PIPE_SEQ); +#ifndef __U_BOOT__ + run_list(ctx.list_head); +#else + code = run_list(ctx.list_head); + if (code == -2) { /* exit */ + b_free(&temp); + code = 0; + /* XXX hackish way to not allow exit from main loop */ + if (inp->peek == file_peek) { + printf("exit not allowed from main input shell.\n"); + continue; + } + break; + } + if (code == -1) + flag_repeat = 0; +#endif + } else { + if (ctx.old_flag != 0) { + free(ctx.stack); + b_reset(&temp); + } +#ifdef __U_BOOT__ + if (inp->__promptme == 0) printf("<INTERRUPT>\n"); + inp->__promptme = 1; +#endif + temp.nonnull = 0; + temp.quote = 0; + inp->p = NULL; + free_pipe_list(ctx.list_head,0); + } + b_free(&temp); + /* 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 || !*s) + return 1; + if (!(p = strchr(s, '\n')) || *++p) { + p = xmalloc(strlen(s) + 2); + strcpy(p, s); + strcat(p, "\n"); + setup_string_in_str(&input, p); + rcode = parse_stream_outer(&input, flag); + free(p); + return rcode; + } else { +#endif + setup_string_in_str(&input, s); + return parse_stream_outer(&input, flag); +#ifdef __U_BOOT__ + } +#endif +} + +#ifndef __U_BOOT__ +static int parse_file_outer(FILE *f) +#else +int parse_file_outer(void) +#endif +{ + int rcode; + struct in_str input; +#ifndef __U_BOOT__ + setup_file_in_str(&input, f); +#else + setup_file_in_str(&input); +#endif + rcode = parse_stream_outer(&input, FLAG_PARSE_SEMICOLON); + return rcode; +} + +#ifdef __U_BOOT__ +#ifdef CONFIG_NEEDS_MANUAL_RELOC +static void u_boot_hush_reloc(void) +{ + unsigned long addr; + struct reserved_combo *r; + + for (r=reserved_list; r<reserved_list+NRES; r++) { + addr = (ulong) (r->literal) + gd->reloc_off; + r->literal = (char *)addr; + } +} +#endif + +int u_boot_hush_start(void) +{ + if (top_vars == NULL) { + top_vars = malloc(sizeof(struct variables)); + top_vars->name = "HUSH_VERSION"; + top_vars->value = "0.01"; + top_vars->next = NULL; + top_vars->flg_export = 0; + top_vars->flg_read_only = 1; +#ifdef CONFIG_NEEDS_MANUAL_RELOC + u_boot_hush_reloc(); +#endif + } + return 0; +} + +static void *xmalloc(size_t size) +{ + void *p = NULL; + + if (!(p = malloc(size))) { + printf("ERROR : memory not allocated\n"); + for(;;); + } + return p; +} + +static void *xrealloc(void *ptr, size_t size) +{ + void *p = NULL; + + if (!(p = realloc(ptr, size))) { + printf("ERROR : memory not allocated\n"); + for(;;); + } + return p; +} +#endif /* __U_BOOT__ */ + +#ifndef __U_BOOT__ +/* Make sure we have a controlling tty. If we get started under a job + * aware app (like bash for example), make sure we are now in charge so + * we don't fight over who gets the foreground */ +static void setup_job_control(void) +{ + static pid_t shell_pgrp; + /* Loop until we are in the foreground. */ + while (tcgetpgrp (shell_terminal) != (shell_pgrp = getpgrp ())) + kill (- shell_pgrp, SIGTTIN); + + /* Ignore interactive and job-control signals. */ + signal(SIGINT, SIG_IGN); + signal(SIGQUIT, SIG_IGN); + signal(SIGTERM, SIG_IGN); + signal(SIGTSTP, SIG_IGN); + signal(SIGTTIN, SIG_IGN); + signal(SIGTTOU, SIG_IGN); + signal(SIGCHLD, SIG_IGN); + + /* Put ourselves in our own process group. */ + setsid(); + shell_pgrp = getpid (); + setpgid (shell_pgrp, shell_pgrp); + + /* Grab control of the terminal. */ + tcsetpgrp(shell_terminal, shell_pgrp); +} + +int hush_main(int argc, char * const *argv) +{ + int opt; + FILE *input; + char **e = environ; + + /* XXX what should these be while sourcing /etc/profile? */ + global_argc = argc; + global_argv = argv; + + /* (re?) initialize globals. Sometimes hush_main() ends up calling + * hush_main(), therefore we cannot rely on the BSS to zero out this + * stuff. Reset these to 0 every time. */ + ifs = NULL; + /* map[] is taken care of with call to update_ifs_map() */ + fake_mode = 0; + interactive = 0; + close_me_head = NULL; + last_bg_pid = 0; + job_list = NULL; + last_jobid = 0; + + /* Initialize some more globals to non-zero values */ + set_cwd(); +#ifdef CONFIG_FEATURE_COMMAND_EDITING + cmdedit_set_initial_prompt(); +#else + PS1 = NULL; +#endif + PS2 = "> "; + + /* initialize our shell local variables with the values + * currently living in the environment */ + if (e) { + for (; *e; e++) + set_local_var(*e, 2); /* without call putenv() */ + } + + last_return_code=EXIT_SUCCESS; + + + if (argv[0] && argv[0][0] == '-') { + debug_printf("\nsourcing /etc/profile\n"); + if ((input = fopen("/etc/profile", "r")) != NULL) { + mark_open(fileno(input)); + parse_file_outer(input); + mark_closed(fileno(input)); + fclose(input); + } + } + input=stdin; + + while ((opt = getopt(argc, argv, "c:xif")) > 0) { + switch (opt) { + case 'c': + { + global_argv = argv+optind; + global_argc = argc-optind; + opt = parse_string_outer(optarg, FLAG_PARSE_SEMICOLON); + goto final_return; + } + break; + case 'i': + interactive++; + break; + case 'f': + fake_mode++; + break; + default: +#ifndef BB_VER + fprintf(stderr, "Usage: sh [FILE]...\n" + " or: sh -c command [args]...\n\n"); + exit(EXIT_FAILURE); +#else + show_usage(); +#endif + } + } + /* A shell is interactive if the `-i' flag was given, or if all of + * the following conditions are met: + * no -c command + * no arguments remaining or the -s flag given + * standard input is a terminal + * standard output is a terminal + * Refer to Posix.2, the description of the `sh' utility. */ + if (argv[optind]==NULL && input==stdin && + isatty(fileno(stdin)) && isatty(fileno(stdout))) { + interactive++; + } + + debug_printf("\ninteractive=%d\n", interactive); + if (interactive) { + /* Looks like they want an interactive shell */ +#ifndef CONFIG_FEATURE_SH_EXTRA_QUIET + printf( "\n\n" BB_BANNER " hush - the humble shell v0.01 (testing)\n"); + printf( "Enter 'help' for a list of built-in commands.\n\n"); +#endif + setup_job_control(); + } + + if (argv[optind]==NULL) { + opt=parse_file_outer(stdin); + goto final_return; + } + + debug_printf("\nrunning script '%s'\n", argv[optind]); + global_argv = argv+optind; + global_argc = argc-optind; + input = xfopen(argv[optind], "r"); + opt = parse_file_outer(input); + +#ifdef CONFIG_FEATURE_CLEAN_UP + fclose(input); + if (cwd && cwd != unknown) + free((char*)cwd); + { + struct variables *cur, *tmp; + for(cur = top_vars; cur; cur = tmp) { + tmp = cur->next; + if (!cur->flg_read_only) { + free(cur->name); + free(cur->value); + free(cur); + } + } + } +#endif + +final_return: + return(opt?opt:last_return_code); +} +#endif + +static char *insert_var_value(char *inp) +{ + return insert_var_value_sub(inp, 0); +} + +static char *insert_var_value_sub(char *inp, int tag_subst) +{ + int res_str_len = 0; + int len; + int done = 0; + char *p, *p1, *res_str = NULL; + + while ((p = strchr(inp, SPECIAL_VAR_SYMBOL))) { + /* check the beginning of the string for normal charachters */ + if (p != inp) { + /* copy any charachters to the result string */ + len = p - inp; + res_str = xrealloc(res_str, (res_str_len + len)); + strncpy((res_str + res_str_len), inp, len); + res_str_len += len; + } + inp = ++p; + /* find the ending marker */ + p = strchr(inp, SPECIAL_VAR_SYMBOL); + *p = '\0'; + /* look up the value to substitute */ + if ((p1 = lookup_param(inp))) { + if (tag_subst) + len = res_str_len + strlen(p1) + 2; + else + len = res_str_len + strlen(p1); + res_str = xrealloc(res_str, (1 + len)); + if (tag_subst) { + /* + * copy the variable value to the result + * string + */ + strcpy((res_str + res_str_len + 1), p1); + + /* + * mark the replaced text to be accepted as + * is + */ + res_str[res_str_len] = SUBSTED_VAR_SYMBOL; + res_str[res_str_len + 1 + strlen(p1)] = + SUBSTED_VAR_SYMBOL; + } else + /* + * copy the variable value to the result + * string + */ + strcpy((res_str + res_str_len), p1); + + res_str_len = len; + } + *p = SPECIAL_VAR_SYMBOL; + inp = ++p; + done = 1; + } + if (done) { + res_str = xrealloc(res_str, (1 + res_str_len + strlen(inp))); + strcpy((res_str + res_str_len), inp); + while ((p = strchr(res_str, '\n'))) { + *p = ' '; + } + } + return (res_str == NULL) ? inp : res_str; +} + +static char **make_list_in(char **inp, char *name) +{ + int len, i; + int name_len = strlen(name); + int n = 0; + char **list; + char *p1, *p2, *p3; + + /* create list of variable values */ + list = xmalloc(sizeof(*list)); + for (i = 0; inp[i]; i++) { + p3 = insert_var_value(inp[i]); + p1 = p3; + while (*p1) { + if (*p1 == ' ') { + p1++; + continue; + } + if ((p2 = strchr(p1, ' '))) { + len = p2 - p1; + } else { + len = strlen(p1); + p2 = p1 + len; + } + /* we use n + 2 in realloc for list,because we add + * new element and then we will add NULL element */ + list = xrealloc(list, sizeof(*list) * (n + 2)); + list[n] = xmalloc(2 + name_len + len); + strcpy(list[n], name); + strcat(list[n], "="); + strncat(list[n], p1, len); + list[n++][name_len + len + 1] = '\0'; + p1 = p2; + } + if (p3 != inp[i]) free(p3); + } + list[n] = NULL; + return list; +} + +/* + * Make new string for parser + * inp - array of argument strings to flatten + * nonnull - indicates argument was quoted when originally parsed + */ +static char *make_string(char **inp, int *nonnull) +{ + char *p; + char *str = NULL; + int n; + int len = 2; + char *noeval_str; + int noeval = 0; + + noeval_str = get_local_var("HUSH_NO_EVAL"); + if (noeval_str != NULL && *noeval_str != '0' && *noeval_str != '\0') + noeval = 1; + for (n = 0; inp[n]; n++) { + p = insert_var_value_sub(inp[n], noeval); + str = xrealloc(str, (len + strlen(p) + (2 * nonnull[n]))); + if (n) { + strcat(str, " "); + } else { + *str = '\0'; + } + if (nonnull[n]) + strcat(str, "'"); + strcat(str, p); + if (nonnull[n]) + strcat(str, "'"); + len = strlen(str) + 3; + if (p != inp[n]) free(p); + } + len = strlen(str); + *(str + len) = '\n'; + *(str + len + 1) = '\0'; + return str; +} + +#ifdef __U_BOOT__ +static int do_showvar(cmd_tbl_t *cmdtp, int flag, int argc, + char * const argv[]) +{ + int i, k; + int rcode = 0; + struct variables *cur; + + if (argc == 1) { /* Print all env variables */ + for (cur = top_vars; cur; cur = cur->next) { + printf ("%s=%s\n", cur->name, cur->value); + if (ctrlc ()) { + puts ("\n ** Abort\n"); + return 1; + } + } + return 0; + } + for (i = 1; i < argc; ++i) { /* print single env variables */ + char *name = argv[i]; + + k = -1; + for (cur = top_vars; cur; cur = cur->next) { + if(strcmp (cur->name, name) == 0) { + k = 0; + printf ("%s=%s\n", cur->name, cur->value); + } + if (ctrlc ()) { + puts ("\n ** Abort\n"); + return 1; + } + } + if (k < 0) { + printf ("## Error: \"%s\" not defined\n", name); + rcode ++; + } + } + return rcode; +} + +U_BOOT_CMD( + showvar, CONFIG_SYS_MAXARGS, 1, do_showvar, + "print local hushshell variables", + "\n - print values of all hushshell variables\n" + "showvar name ...\n" + " - print value of hushshell variable 'name'" +); + +#endif +/****************************************************************************/ |