diff options
Diffstat (limited to 'msh.c')
| -rw-r--r-- | msh.c | 4870 |
1 files changed, 0 insertions, 4870 deletions
@@ -1,4870 +0,0 @@ -/* vi: set sw=4 ts=4: */ -/* - * Minix shell port for busybox - * - * This version of the Minix shell was adapted for use in busybox - * by Erik Andersen <andersee@debian.org> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * - * Original copyright notice is retained at the end of this file. - */ - -#include <ctype.h> -#include <dirent.h> -#include <errno.h> -#include <fcntl.h> -#include <limits.h> -#include <setjmp.h> -#include <signal.h> -#include <stddef.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <time.h> -#include <unistd.h> -#include <sys/stat.h> -#include <sys/times.h> -#include <sys/types.h> -#include <sys/wait.h> - -#include "cmdedit.h" -#include "busybox.h" - - -/* -------- sh.h -------- */ -/* - * shell - */ - -#define LINELIM 2100 -#define NPUSH 8 /* limit to input nesting */ - -#define NOFILE 20 /* Number of open files */ -#define NUFILE 10 /* Number of user-accessible files */ -#define FDBASE 10 /* First file usable by Shell */ - -/* - * values returned by wait - */ -#define WAITSIG(s) ((s)&0177) -#define WAITVAL(s) (((s)>>8)&0377) -#define WAITCORE(s) (((s)&0200)!=0) - -/* - * library and system defintions - */ -typedef void xint; /* base type of jmp_buf, for not broken compilers */ - -/* - * shell components - */ - -#define QUOTE 0200 - -#define NOBLOCK ((struct op *)NULL) -#define NOWORD ((char *)NULL) -#define NOWORDS ((char **)NULL) -#define NOPIPE ((int *)NULL) - -/* - * Description of a command or an operation on commands. - * Might eventually use a union. - */ -struct op { - int type; /* operation type, see below */ - char **words; /* arguments to a command */ - struct ioword **ioact; /* IO actions (eg, < > >>) */ - struct op *left; - struct op *right; - char *str; /* identifier for case and for */ -}; - -#define TCOM 1 /* command */ -#define TPAREN 2 /* (c-list) */ -#define TPIPE 3 /* a | b */ -#define TLIST 4 /* a [&;] b */ -#define TOR 5 /* || */ -#define TAND 6 /* && */ -#define TFOR 7 -#define TDO 8 -#define TCASE 9 -#define TIF 10 -#define TWHILE 11 -#define TUNTIL 12 -#define TELIF 13 -#define TPAT 14 /* pattern in case */ -#define TBRACE 15 /* {c-list} */ -#define TASYNC 16 /* c & */ - -/* - * actions determining the environment of a process - */ -#define BIT(i) (1<<(i)) -#define FEXEC BIT(0) /* execute without forking */ - -/* - * flags to control evaluation of words - */ -#define DOSUB 1 /* interpret $, `, and quotes */ -#define DOBLANK 2 /* perform blank interpretation */ -#define DOGLOB 4 /* interpret [?* */ -#define DOKEY 8 /* move words with `=' to 2nd arg. list */ -#define DOTRIM 16 /* trim resulting string */ - -#define DOALL (DOSUB|DOBLANK|DOGLOB|DOKEY|DOTRIM) - -static char **dolv; -static int dolc; -static int exstat; -static char gflg; -static int interactive; /* Is this an interactive shell */ -static int execflg; -static int multiline; /* \n changed to ; */ -static struct op *outtree; /* result from parser */ - -static xint *failpt; -static xint *errpt; -static struct brkcon *brklist; -static int isbreak; -static int newfile(char *s); -static char *findeq(char *cp); -static char *cclass(char *p, int sub); -static void initarea(void); -extern int msh_main(int argc, char **argv); - - -struct brkcon { - jmp_buf brkpt; - struct brkcon *nextlev; -} ; - -/* - * redirection - */ -struct ioword { - short io_unit; /* unit affected */ - short io_flag; /* action (below) */ - char *io_name; /* file name */ -}; -#define IOREAD 1 /* < */ -#define IOHERE 2 /* << (here file) */ -#define IOWRITE 4 /* > */ -#define IOCAT 8 /* >> */ -#define IOXHERE 16 /* ${}, ` in << */ -#define IODUP 32 /* >&digit */ -#define IOCLOSE 64 /* >&- */ - -#define IODEFAULT (-1) /* token for default IO unit */ - -static struct wdblock *wdlist; -static struct wdblock *iolist; - -/* - * parsing & execution environment - */ -static struct env { - char *linep; - struct io *iobase; - struct io *iop; - xint *errpt; - int iofd; - struct env *oenv; -} e; - -/* - * flags: - * -e: quit on error - * -k: look for name=value everywhere on command line - * -n: no execution - * -t: exit after reading and executing one command - * -v: echo as read - * -x: trace - * -u: unset variables net diagnostic - */ -static char *flag; - -static char *null; /* null value for variable */ -static int intr; /* interrupt pending */ - -static char *trap[_NSIG+1]; -static char ourtrap[_NSIG+1]; -static int trapset; /* trap pending */ - -static int heedint; /* heed interrupt signals */ - -static int yynerrs; /* yacc */ - -static char line[LINELIM]; -static char *elinep; - -/* - * other functions - */ -static int (*inbuilt(char *s ))(void); - -static char *rexecve (char *c , char **v, char **envp ); -static char *space (int n ); -static char *strsave (char *s, int a ); -static char *evalstr (char *cp, int f ); -static char *putn (int n ); -static char *itoa (unsigned u, int n ); -static char *unquote (char *as ); -static struct var *lookup (char *n ); -static int rlookup (char *n ); -static struct wdblock *glob (char *cp, struct wdblock *wb ); -static int my_getc( int ec); -static int subgetc (int ec, int quoted ); -static char **makenv (void); -static char **eval (char **ap, int f ); -static int setstatus (int s ); -static int waitfor (int lastpid, int canintr ); - -static void onintr (int s ); /* SIGINT handler */ - -static int newenv (int f ); -static void quitenv (void); -static void err (char *s ); -static int anys (char *s1, char *s2 ); -static int any (int c, char *s ); -static void next (int f ); -static void setdash (void); -static void onecommand (void); -static void runtrap (int i ); -static int gmatch (char *s, char *p ); - -/* - * error handling - */ -static void leave (void); /* abort shell (or fail in subshell) */ -static void fail (void); /* fail but return to process next command */ -static void warn (char *s ); -static void sig (int i ); /* default signal handler */ - - - -/* -------- area stuff -------- */ - -#define REGSIZE sizeof(struct region) -#define GROWBY 256 -//#define SHRINKBY 64 -#undef SHRINKBY -#define FREE 32767 -#define BUSY 0 -#define ALIGN (sizeof(int)-1) - - -struct region { - struct region *next; - int area; -}; - - - -/* -------- grammar stuff -------- */ -typedef union { - char *cp; - char **wp; - int i; - struct op *o; -} YYSTYPE; -#define WORD 256 -#define LOGAND 257 -#define LOGOR 258 -#define BREAK 259 -#define IF 260 -#define THEN 261 -#define ELSE 262 -#define ELIF 263 -#define FI 264 -#define CASE 265 -#define ESAC 266 -#define FOR 267 -#define WHILE 268 -#define UNTIL 269 -#define DO 270 -#define DONE 271 -#define IN 272 -#define YYERRCODE 300 - -/* flags to yylex */ -#define CONTIN 01 /* skip new lines to complete command */ - -#define SYNTAXERR zzerr() -static struct op *pipeline(int cf ); -static struct op *andor(void); -static struct op *c_list(void); -static int synio(int cf ); -static void musthave (int c, int cf ); -static struct op *simple(void); -static struct op *nested(int type, int mark ); -static struct op *command(int cf ); -static struct op *dogroup(int onlydone ); -static struct op *thenpart(void); -static struct op *elsepart(void); -static struct op *caselist(void); -static struct op *casepart(void); -static char **pattern(void); -static char **wordlist(void); -static struct op *list(struct op *t1, struct op *t2 ); -static struct op *block(int type, struct op *t1, struct op *t2, char **wp ); -static struct op *newtp(void); -static struct op *namelist(struct op *t ); -static char **copyw(void); -static void word(char *cp ); -static struct ioword **copyio(void); -static struct ioword *io (int u, int f, char *cp ); -static void zzerr(void); -static void yyerror(char *s ); -static int yylex(int cf ); -static int collect(int c, int c1 ); -static int dual(int c ); -static void diag(int ec ); -static char *tree(unsigned size ); - -/* -------- var.h -------- */ - -struct var { - char *value; - char *name; - struct var *next; - char status; -}; -#define COPYV 1 /* flag to setval, suggesting copy */ -#define RONLY 01 /* variable is read-only */ -#define EXPORT 02 /* variable is to be exported */ -#define GETCELL 04 /* name & value space was got with getcell */ - -static struct var *vlist; /* dictionary */ - -static struct var *homedir; /* home directory */ -static struct var *prompt; /* main prompt */ -static struct var *cprompt; /* continuation prompt */ -static struct var *path; /* search path for commands */ -static struct var *shell; /* shell to interpret command files */ -static struct var *ifs; /* field separators */ - -static int yyparse (void); -static struct var *lookup (char *n ); -static void setval (struct var *vp, char *val ); -static void nameval (struct var *vp, char *val, char *name ); -static void export (struct var *vp ); -static void ronly (struct var *vp ); -static int isassign (char *s ); -static int checkname (char *cp ); -static int assign (char *s, int cf ); -static void putvlist (int f, int out ); -static int eqname (char *n1, char *n2 ); - -static int execute (struct op *t, int *pin, int *pout, int act ); - -/* -------- io.h -------- */ -/* io buffer */ -struct iobuf { - unsigned id; /* buffer id */ - char buf[512]; /* buffer */ - char *bufp; /* pointer into buffer */ - char *ebufp; /* pointer to end of buffer */ -}; - -/* possible arguments to an IO function */ -struct ioarg { - char *aword; - char **awordlist; - int afile; /* file descriptor */ - unsigned afid; /* buffer id */ - long afpos; /* file position */ - struct iobuf *afbuf; /* buffer for this file */ -}; -//static struct ioarg ioargstack[NPUSH]; -#define AFID_NOBUF (~0) -#define AFID_ID 0 - -/* an input generator's state */ -struct io { - int (*iofn)(); - struct ioarg *argp; - int peekc; - char prev; /* previous character read by readc() */ - char nlcount; /* for `'s */ - char xchar; /* for `'s */ - char task; /* reason for pushed IO */ -}; -//static struct io iostack[NPUSH]; -#define XOTHER 0 /* none of the below */ -#define XDOLL 1 /* expanding ${} */ -#define XGRAVE 2 /* expanding `'s */ -#define XIO 3 /* file IO */ - -/* in substitution */ -#define INSUB() (e.iop->task == XGRAVE || e.iop->task == XDOLL) - -/* - * input generators for IO structure - */ -static int nlchar (struct ioarg *ap ); -static int strchar (struct ioarg *ap ); -static int qstrchar (struct ioarg *ap ); -static int filechar (struct ioarg *ap ); -static int herechar (struct ioarg *ap ); -static int linechar (struct ioarg *ap ); -static int gravechar (struct ioarg *ap, struct io *iop ); -static int qgravechar (struct ioarg *ap, struct io *iop ); -static int dolchar (struct ioarg *ap ); -static int wdchar (struct ioarg *ap ); -static void scraphere (void); -static void freehere (int area ); -static void gethere (void); -static void markhere (char *s, struct ioword *iop ); -static int herein (char *hname, int xdoll ); -static int run (struct ioarg *argp, int (*f)()); - -/* - * IO functions - */ -static int eofc (void); -static int readc (void); -static void unget (int c ); -static void ioecho (int c ); -static void prs (char *s ); -static void prn (unsigned u ); -static void closef (int i ); -static void closeall (void); - -/* - * IO control - */ -static void pushio (struct ioarg *argp, int (*fn)()); -static int remap (int fd ); -static int openpipe (int *pv ); -static void closepipe (int *pv ); -static struct io *setbase (struct io *ip ); - -static struct ioarg temparg; /* temporary for PUSHIO */ -#define PUSHIO(what,arg,gen) ((temparg.what = (arg)),pushio(&temparg,(gen))) -#define RUN(what,arg,gen) ((temparg.what = (arg)), run(&temparg,(gen))) - -/* -------- word.h -------- */ - -#define NSTART 16 /* default number of words to allow for initially */ - -struct wdblock { - short w_bsize; - short w_nword; - /* bounds are arbitrary */ - char *w_words[1]; -}; - -static struct wdblock *addword (char *wd, struct wdblock *wb ); -static struct wdblock *newword (int nw ); -static char **getwords (struct wdblock *wb ); - -/* -------- area.h -------- */ - -/* - * storage allocation - */ -static char *getcell (unsigned nbytes ); -static void garbage (void); -static void setarea (char *cp, int a ); -static int getarea (char *cp ); -static void freearea (int a ); -static void freecell (char *cp ); -static int areanum; /* current allocation area */ - -#define NEW(type) (type *)getcell(sizeof(type)) -#define DELETE(obj) freecell((char *)obj) - - -/* -------- misc stuff -------- */ - -static int forkexec (struct op *t, int *pin, int *pout, int act, char **wp, int *pforked ); -static int iosetup (struct ioword *iop, int pipein, int pipeout ); -static void echo(char **wp ); -static struct op **find1case (struct op *t, char *w ); -static struct op *findcase (struct op *t, char *w ); -static void brkset(struct brkcon *bc ); -static int dolabel(void); -static int dohelp(void); -static int dochdir(struct op *t ); -static int doshift(struct op *t ); -static int dologin(struct op *t ); -static int doumask(struct op *t ); -static int doexec(struct op *t ); -static int dodot(struct op *t ); -static int dowait(struct op *t ); -static int doread(struct op *t ); -static int doeval(struct op *t ); -static int dotrap(struct op *t ); -static int getsig(char *s ); -static void setsig (int n, void (*f)()); -static int getn(char *as ); -static int dobreak(struct op *t ); -static int docontinue(struct op *t ); -static int brkcontin (char *cp, int val ); -static int doexit(struct op *t ); -static int doexport(struct op *t ); -static int doreadonly(struct op *t ); -static void rdexp (char **wp, void (*f)(), int key); -static void badid(char *s ); -static int doset(struct op *t ); -static void varput (char *s, int out ); -static int dotimes(void); -static int expand (char *cp, struct wdblock **wbp, int f ); -static char *blank(int f ); -static int dollar(int quoted ); -static int grave(int quoted ); -static void globname (char *we, char *pp ); -static char *generate (char *start1, char *end1, char *middle, char *end ); -static int anyspcl(struct wdblock *wb ); -static int xstrcmp (char *p1, char *p2 ); -static void glob0 (char *a0, unsigned int a1, int a2, int (*a3)(char *, char *)); -static void glob1 (char *base, char *lim ); -static void glob2 (char *i, char *j ); -static void glob3 (char *i, char *j, char *k ); -static void readhere (char **name, char *s, int ec ); -static void pushio(struct ioarg *argp, int (*fn)()); -static int xxchar(struct ioarg *ap ); - -struct here { - char *h_tag; - int h_dosub; - struct ioword *h_iop; - struct here *h_next; -}; - -static char *signame[] = { - "Signal 0", - "Hangup", - (char *)NULL, /* interrupt */ - "Quit", - "Illegal instruction", - "Trace/BPT trap", - "Abort", - "Bus error", - "Floating Point Exception", - "Killed", - "SIGUSR1", - "SIGSEGV", - "SIGUSR2", - (char *)NULL, /* broken pipe */ - "Alarm clock", - "Terminated", -}; -#define NSIGNAL (sizeof(signame)/sizeof(signame[0])) - -struct res { - char *r_name; - int r_val; -}; -static struct res restab[] = { - {"for", FOR}, - {"case", CASE}, - {"esac", ESAC}, - {"while", WHILE}, - {"do", DO}, - {"done", DONE}, - {"if", IF}, - {"in", IN}, - {"then", THEN}, - {"else", ELSE}, - {"elif", ELIF}, - {"until", UNTIL}, - {"fi", FI}, - - {";;", BREAK}, - {"||", LOGOR}, - {"&&", LOGAND}, - {"{", '{'}, - {"}", '}'}, - {0, 0}, -}; - - -struct builtincmd { - const char *name; - int (*builtinfunc)(); -}; -static const struct builtincmd builtincmds[] = { - {".", dodot}, - {":", dolabel}, - {"break", dobreak}, - {"cd", dochdir}, - {"continue",docontinue}, - {"eval", doeval}, - {"exec", doexec}, - {"exit", doexit}, - {"export", doexport}, - {"help", dohelp}, - {"login", dologin}, - {"newgrp", dologin}, - {"read", doread}, - {"readonly",doreadonly}, - {"set", doset}, - {"shift", doshift}, - {"times", dotimes}, - {"trap", dotrap}, - {"umask", doumask}, - {"wait", dowait}, - {0,0} -}; - -/* Globals */ -extern char **environ; /* environment pointer */ -static char **dolv; -static int dolc; -static int exstat; -static char gflg; -static int interactive; /* Is this an interactive shell */ -static int execflg; -static int multiline; /* \n changed to ; */ -static struct op *outtree; /* result from parser */ -static xint *failpt; -static xint *errpt; -static struct brkcon *brklist; -static int isbreak; -static struct wdblock *wdlist; -static struct wdblock *iolist; -static char *trap[_NSIG+1]; -static char ourtrap[_NSIG+1]; -static int trapset; /* trap pending */ -static int yynerrs; /* yacc */ -static char line[LINELIM]; -static struct var *vlist; /* dictionary */ -static struct var *homedir; /* home directory */ -static struct var *prompt; /* main prompt */ -static struct var *cprompt; /* continuation prompt */ -static struct var *path; /* search path for commands */ -static struct var *shell; /* shell to interpret command files */ -static struct var *ifs; /* field separators */ -static struct ioarg ioargstack[NPUSH]; -static struct io iostack[NPUSH]; -static int areanum; /* current allocation area */ -static int intr; -static int inparse; -static char flags['z'-'a'+1]; -static char *flag = flags-'a'; -static char *elinep = line+sizeof(line)-5; -static char *null = ""; -static int heedint =1; -static struct env e ={line, iostack, iostack-1, (xint *)NULL, FDBASE, (struct env *)NULL}; -static void (*qflag)(int) = SIG_IGN; -static char shellname[] = "/bin/sh"; -static char search[] = ":/bin:/usr/bin"; -static int startl; -static int peeksym; -static int nlseen; -static int iounit = IODEFAULT; -static YYSTYPE yylval; -static struct iobuf sharedbuf = {AFID_NOBUF}; -static struct iobuf mainbuf = {AFID_NOBUF}; -static unsigned bufid = AFID_ID; /* buffer id counter */ -static struct ioarg temparg = {0, 0, 0, AFID_NOBUF, 0}; -static struct here *inhere; /* list of hear docs while parsing */ -static struct here *acthere; /* list of active here documents */ -static struct region *areabot; /* bottom of area */ -static struct region *areatop; /* top of area */ -static struct region *areanxt; /* starting point of scan */ -static void * brktop; -static void * brkaddr; - - -#ifdef BB_FEATURE_COMMAND_EDITING -static char * current_prompt; -#endif - - -/* -------- sh.c -------- */ -/* - * shell - */ - - -extern int msh_main(int argc, char **argv) -{ - register int f; - register char *s; - int cflag; - char *name, **ap; - int (*iof)(); - - initarea(); - if ((ap = environ) != NULL) { - while (*ap) - assign(*ap++, !COPYV); - for (ap = environ; *ap;) - export(lookup(*ap++)); - } - closeall(); - areanum = 1; - - shell = lookup("SHELL"); - if (shell->value == null) - setval(shell, shellname); - export(shell); - - homedir = lookup("HOME"); - if (homedir->value == null) - setval(homedir, "/"); - export(homedir); - - setval(lookup("$"), itoa(getpid(), 5)); - - path = lookup("PATH"); - if (path->value == null) - setval(path, search); - export(path); - - ifs = lookup("IFS"); - if (ifs->value == null) - setval(ifs, " \t\n"); - - prompt = lookup("PS1"); -#ifdef BB_FEATURE_SH_FANCY_PROMPT - if (prompt->value == null) -#endif - setval(prompt, "$ "); - if (geteuid() == 0) { - setval(prompt, "# "); - prompt->status &= ~EXPORT; - } - cprompt = lookup("PS2"); -#ifdef BB_FEATURE_SH_FANCY_PROMPT - if (cprompt->value == null) -#endif - setval(cprompt, "> "); - - iof = filechar; - cflag = 0; - name = *argv++; - if (--argc >= 1) { - if(argv[0][0] == '-' && argv[0][1] != '\0') { - for (s = argv[0]+1; *s; s++) - switch (*s) { - case 'c': - prompt->status &= ~EXPORT; - cprompt->status &= ~EXPORT; - setval(prompt, ""); - setval(cprompt, ""); - cflag = 1; - if (--argc > 0) - PUSHIO(aword, *++argv, iof = nlchar); - break; - - case 'q': - qflag = SIG_DFL; - break; - - case 's': - /* standard input */ - break; - - case 't': - prompt->status &= ~EXPORT; - setval(prompt, ""); - iof = linechar; - break; - - case 'i': - interactive++; - default: - if (*s>='a' && *s<='z') - flag[(int)*s]++; - } - } else { - argv--; - argc++; - } - if (iof == filechar && --argc > 0) { - setval(prompt, ""); - setval(cprompt, ""); - prompt->status &= ~EXPORT; - cprompt->status &= ~EXPORT; - if (newfile(name = *++argv)) - exit(1); - } - } - setdash(); - if (e.iop < iostack) { - PUSHIO(afile, 0, iof); - if (isatty(0) && isatty(1) && !cflag) { - interactive++; -#ifndef BB_FEATURE_SH_EXTRA_QUIET - printf( "\n\n" BB_BANNER " Built-in shell (msh)\n"); - printf( "Enter 'help' for a list of built-in commands.\n\n"); -#endif - } - } - signal(SIGQUIT, qflag); - if (name && name[0] == '-') { - interactive++; - if ((f = open(".profile", 0)) >= 0) - next(remap(f)); - if ((f = open("/etc/profile", 0)) >= 0) - next(remap(f)); - } - if (interactive) - signal(SIGTERM, sig); - if (signal(SIGINT, SIG_IGN) != SIG_IGN) - signal(SIGINT, onintr); - dolv = argv; - dolc = argc; - dolv[0] = name; - if (dolc > 1) { - for (ap = ++argv; --argc > 0;) { - if (assign(*ap = *argv++, !COPYV)) { - dolc--; /* keyword */ - } else { - ap++; - } - } - } - setval(lookup("#"), putn((--dolc < 0) ? (dolc = 0) : dolc)); - - for (;;) { - if (interactive && e.iop <= iostack) { -#ifdef BB_FEATURE_COMMAND_EDITING - current_prompt=prompt->value; -#else - prs(prompt->value); -#endif - } - onecommand(); - } -} - -static void -setdash() -{ - register char *cp; - register int c; - char m['z'-'a'+1]; - - cp = m; - for (c='a'; c<='z'; c++) - if (flag[c]) - *cp++ = c; - *cp = 0; - setval(lookup("-"), m); -} - -static int -newfile(s) -register char *s; -{ - register int f; - - if (strcmp(s, "-") != 0) { - f = open(s, 0); - if (f < 0) { - prs(s); - err(": cannot open"); - return(1); - } - } else - f = 0; - next(remap(f)); - return(0); -} - -static void -onecommand() -{ - register int i; - jmp_buf m1; - - while (e.oenv) - quitenv(); - areanum = 1; - freehere(areanum); - freearea(areanum); - garbage(); - wdlist = 0; - iolist = 0; - e.errpt = 0; - e.linep = line; - yynerrs = 0; - multiline = 0; - inparse = 1; - intr = 0; - execflg = 0; - setjmp(failpt = m1); /* Bruce Evans' fix */ - if (setjmp(failpt = m1) || yyparse() || intr) { - while (e.oenv) - quitenv(); - scraphere(); - if (!interactive && intr) - leave(); - inparse = 0; - intr = 0; - return; - } - inparse = 0; - brklist = 0; - intr = 0; - execflg = 0; - if (!flag['n']) - execute(outtree, NOPIPE, NOPIPE, 0); - if (!interactive && intr) { - execflg = 0; - leave(); - } - if ((i = trapset) != 0) { - trapset = 0; - runtrap(i); - } -} - -static void -fail() -{ - longjmp(failpt, 1); - /* NOTREACHED */ -} - -static void -leave() -{ - if (execflg) - fail(); - scraphere(); - freehere(1); - runtrap(0); - exit(exstat); - /* NOTREACHED */ -} - -static void -warn(s) -register char *s; -{ - if(*s) { - prs(s); - exstat = -1; - } - prs("\n"); - if (flag['e']) - leave(); -} - -static void -err(s) -char *s; -{ - warn(s); - if (flag['n']) - return; - if (!interactive) - leave(); - if (e.errpt) - longjmp(e.errpt, 1); - closeall(); - e.iop = e.iobase = iostack; -} - -static int -newenv(f) -int f; -{ - register struct env *ep; - - if (f) { - quitenv(); - return(1); - } - ep = (struct env *) space(sizeof(*ep)); - if (ep == NULL) { - while (e.oenv) - quitenv(); - fail(); - } - *ep = e; - e.oenv = ep; - e.errpt = errpt; - return(0); -} - -static void -quitenv() -{ - register struct env *ep; - register int fd; - - if ((ep = e.oenv) != NULL) { - fd = e.iofd; - e = *ep; - /* should close `'d files */ - DELETE(ep); - while (--fd >= e.iofd) - close(fd); - } -} - -/* - * Is any character from s1 in s2? - */ -static int -anys(s1, s2) -register char *s1, *s2; -{ - while (*s1) - if (any(*s1++, s2)) - return(1); - return(0); -} - -/* - * Is character c in s? - */ -static int -any(c, s) -register int c; -register char *s; -{ - while (*s) - if (*s++ == c) - return(1); - return(0); -} - -static char * -putn(n) -register int n; -{ - return(itoa(n, -1)); -} - -static char * -itoa(u, n) -register unsigned u; -int n; -{ - register char *cp; - static char s[20]; - int m; - - m = 0; - if (n < 0 && (int) u < 0) { - m++; - u = -u; - } - cp = s+sizeof(s); - *--cp = 0; - do { - *--cp = u%10 + '0'; - u /= 10; - } while (--n > 0 || u); - if (m) - *--cp = '-'; - return(cp); -} - -static void -next(f) -int f; -{ - PUSHIO(afile, f, filechar); -} - -static void -onintr(s) -int s; /* ANSI C requires a parameter */ -{ - signal(SIGINT, onintr); - intr = 1; - if (interactive) { - if (inparse) { - prs("\n"); - fail(); - } - } - else if (heedint) { - execflg = 0; - leave(); - } -} - -static char * -space(n) -int n; -{ - register char *cp; - - if ((cp = getcell(n)) == 0) - err("out of string space"); - return(cp); -} - -static char * -strsave(s, a) -register char *s; -int a; -{ - register char *cp, *xp; - - if ((cp = space(strlen(s)+1)) != NULL) { - setarea((char *)cp, a); - for (xp = cp; (*xp++ = *s++) != '\0';) - ; - return(cp); - } - return(""); -} - -/* - * trap handling - */ -static void -sig(i) -register int i; -{ - trapset = i; - signal(i, sig); -} - -static void runtrap(i) -int i; -{ - char *trapstr; - - if ((trapstr = trap[i]) == NULL) - return; - if (i == 0) - trap[i] = 0; - RUN(aword, trapstr, nlchar); -} - -/* -------- var.c -------- */ - -/* - * Find the given name in the dictionary - * and return its value. If the name was - * not previously there, enter it now and - * return a null value. - */ -static struct var * -lookup(n) -register char *n; -{ - register struct var *vp; - register char *cp; - register int c; - static struct var dummy; - - if (isdigit(*n)) { - dummy.name = n; - for (c = 0; isdigit(*n) && c < 1000; n++) - c = c*10 + *n-'0'; - dummy.status = RONLY; - dummy.value = c <= dolc? dolv[c]: null; - return(&dummy); - } - for (vp = vlist; vp; vp = vp->next) - if (eqname(vp->name, n)) - return(vp); - cp = findeq(n); - vp = (struct var *)space(sizeof(*vp)); - if (vp == 0 || (vp->name = space((int)(cp-n)+2)) == 0) { - dummy.name = dummy.value = ""; - return(&dummy); - } - for (cp = vp->name; (*cp = *n++) && *cp != '='; cp++) - ; - if (*cp == 0) - *cp = '='; - *++cp = 0; - setarea((char *)vp, 0); - setarea((char *)vp->name, 0); - vp->value = null; - vp->next = vlist; - vp->status = GETCELL; - vlist = vp; - return(vp); -} - -/* - * give variable at `vp' the value `val'. - */ -static void -setval(vp, val) -struct var *vp; -char *val; -{ - nameval(vp, val, (char *)NULL); -} - -/* - * if name is not NULL, it must be - * a prefix of the space `val', - * and end with `='. - * this is all so that exporting - * values is reasonably painless. - */ -static void -nameval(vp, val, name) -register struct var *vp; -char *val, *name; -{ - register char *cp, *xp; - char *nv; - int fl; - - if (vp->status & RONLY) { - for (xp = vp->name; *xp && *xp != '=';) - putc(*xp++, stderr); - err(" is read-only"); - return; - } - fl = 0; - if (name == NULL) { - xp = space(strlen(vp->name)+strlen(val)+2); - if (xp == 0) - return; - /* make string: name=value */ - setarea((char *)xp, 0); - name = xp; - for (cp = vp->name; (*xp = *cp++) && *xp!='='; xp++) - ; - if (*xp++ == 0) - xp[-1] = '='; - nv = xp; - for (cp = val; (*xp++ = *cp++) != '\0';) - ; - val = nv; - fl = GETCELL; - } - if (vp->status & GETCELL) - freecell(vp->name); /* form new string `name=value' */ - vp->name = name; - vp->value = val; - vp->status |= fl; -} - -static void -export(vp) -struct var *vp; -{ - vp->status |= EXPORT; -} - -static void -ronly(vp) -struct var *vp; -{ - if (isalpha(vp->name[0]) || vp->name[0] == '_') /* not an internal symbol */ - vp->status |= RONLY; -} - -static int -isassign(s) -register char *s; -{ - if (!isalpha((int)*s) && *s != '_') - return(0); - for (; *s != '='; s++) - if (*s == 0 || (!isalnum(*s) && *s != '_')) - return(0); - return(1); -} - -static int -assign(s, cf) -register char *s; -int cf; -{ - register char *cp; - struct var *vp; - - if (!isalpha(*s) && *s != '_') - return(0); - for (cp = s; *cp != '='; cp++) - if (*cp == 0 || (!isalnum(*cp) && *cp != '_')) - return(0); - vp = lookup(s); - nameval(vp, ++cp, cf == COPYV? (char *)NULL: s); - if (cf != COPYV) - vp->status &= ~GETCELL; - return(1); -} - -static int -checkname(cp) -register char *cp; -{ - if (!isalpha(*cp++) && *(cp-1) != '_') - return(0); - while (*cp) - if (!isalnum(*cp++) && *(cp-1) != '_') - return(0); - return(1); -} - -static void -putvlist(f, out) -register int f, out; -{ - register struct var *vp; - - for (vp = vlist; vp; vp = vp->next) - if (vp->status & f && (isalpha(*vp->name) || *vp->name == '_')) { - if (vp->status & EXPORT) - write(out, "export ", 7); - if (vp->status & RONLY) - write(out, "readonly ", 9); - write(out, vp->name, (int)(findeq(vp->name) - vp->name)); - write(out, "\n", 1); - } -} - -static int -eqname(n1, n2) -register char *n1, *n2; -{ - for (; *n1 != '=' && *n1 != 0; n1++) - if (*n2++ != *n1) - return(0); - return(*n2 == 0 || *n2 == '='); -} - -static char * -findeq(cp) -register char *cp; -{ - while (*cp != '\0' && *cp != '=') - cp++; - return(cp); -} - -/* -------- gmatch.c -------- */ -/* - * int gmatch(string, pattern) - * char *string, *pattern; - * - * Match a pattern as in sh(1). - */ - -#define CMASK 0377 -#define QUOTE 0200 -#define QMASK (CMASK&~QUOTE) -#define NOT '!' /* might use ^ */ - -static int -gmatch(s, p) -register char *s, *p; -{ - register int sc, pc; - - if (s == NULL || p == NULL) - return(0); - while ((pc = *p++ & CMASK) != '\0') { - sc = *s++ & QMASK; - switch (pc) { - case '[': - if ((p = cclass(p, sc)) == NULL) - return(0); - break; - - case '?': - if (sc == 0) - return(0); - break; - - case '*': - s--; - do { - if (*p == '\0' || gmatch(s, p)) - return(1); - } while (*s++ != '\0'); - return(0); - - default: - if (sc != (pc&~QUOTE)) - return(0); - } - } - return(*s == 0); -} - -static char * -cclass(p, sub) -register char *p; -register int sub; -{ - register int c, d, not, found; - - if ((not = *p == NOT) != 0) - p++; - found = not; - do { - if (*p == '\0') - return((char *)NULL); - c = *p & CMASK; - if (p[1] == '-' && p[2] != ']') { - d = p[2] & CMASK; - p++; - } else - d = c; - if (c == sub || (c <= sub && sub <= d)) - found = !not; - } while (*++p != ']'); - return(found? p+1: (char *)NULL); -} - - -/* -------- area.c -------- */ - -/* - * All memory between (char *)areabot and (char *)(areatop+1) is - * exclusively administered by the area management routines. - * It is assumed that sbrk() and brk() manipulate the high end. - */ - -#define sbrk(X) ({ void * __q = (void *)-1; if (brkaddr + (int)(X) < brktop) { __q = brkaddr; brkaddr+=(int)(X); } __q;}) - -static void -initarea() -{ - brkaddr = malloc(65000); - brktop = brkaddr + 65000; - - while ((int)sbrk(0) & ALIGN) - sbrk(1); - areabot = (struct region *)sbrk(REGSIZE); - - areabot->next = areabot; - areabot->area = BUSY; - areatop = areabot; - areanxt = areabot; -} - -char * -getcell(nbytes) -unsigned nbytes; -{ - register int nregio; - register struct region *p, *q; - register int i; - - if (nbytes == 0) { - puts("getcell(0)"); - abort(); - } /* silly and defeats the algorithm */ - /* - * round upwards and add administration area - */ - nregio = (nbytes+(REGSIZE-1))/REGSIZE + 1; - for (p = areanxt;;) { - if (p->area > areanum) { - /* - * merge free cells - */ - while ((q = p->next)->area > areanum && q != areanxt) - p->next = q->next; - /* - * exit loop if cell big enough - */ - if (q >= p + nregio) - goto found; - } - p = p->next; - if (p == areanxt) - break; - } - i = nregio >= GROWBY ? nregio : GROWBY; - p = (struct region *)sbrk(i * REGSIZE); - if (p == (struct region *)-1) - return((char *)NULL); - p--; - if (p != areatop) { - puts("not contig"); - abort(); /* allocated areas are contiguous */ - } - q = p + i; - p->next = q; - p->area = FREE; - q->next = areabot; - q->area = BUSY; - areatop = q; -found: - /* - * we found a FREE area big enough, pointed to by 'p', and up to 'q' - */ - areanxt = p + nregio; - if (areanxt < q) { - /* - * split into requested area and rest - */ - if (areanxt+1 > q) { - puts("OOM"); - abort(); /* insufficient space left for admin */ - } - areanxt->next = q; - areanxt->area = FREE; - p->next = areanxt; - } - p->area = areanum; - return((char *)(p+1)); -} - -static void -freecell(cp) -char *cp; -{ - register struct region *p; - - if ((p = (struct region *)cp) != NULL) { - p--; - if (p < areanxt) - areanxt = p; - p->area = FREE; - } -} - -static void -freearea(a) -register int a; -{ - register struct region *p, *top; - - top = areatop; - for (p = areabot; p != top; p = p->next) - if (p->area >= a) - p->area = FREE; -} - -static void -setarea(cp,a) -char *cp; -int a; -{ - register struct region *p; - - if ((p = (struct region *)cp) != NULL) - (p-1)->area = a; -} - -int -getarea(cp) -char *cp; -{ - return ((struct region*)cp-1)->area; -} - -static void -garbage() -{ - register struct region *p, *q, *top; - - top = areatop; - for (p = areabot; p != top; p = p->next) { - if (p->area > areanum) { - while ((q = p->next)->area > areanum) - p->next = q->next; - areanxt = p; - } - } -#ifdef SHRINKBY - if (areatop >= q + SHRINKBY && q->area > areanum) { - brk((char *)(q+1)); - q->next = areabot; - q->area = BUSY; - areatop = q; - } -#endif -} - -/* -------- csyn.c -------- */ -/* - * shell: syntax (C version) - */ - - -int -yyparse() -{ - startl = 1; - peeksym = 0; - yynerrs = 0; - outtree = c_list(); - musthave('\n', 0); - return(yynerrs!=0); -} - -static struct op * -pipeline(cf) -int cf; -{ - register struct op *t, *p; - register int c; - - t = command(cf); - if (t != NULL) { - while ((c = yylex(0)) == '|') { - if ((p = command(CONTIN)) == NULL) - SYNTAXERR; - if (t->type != TPAREN && t->type != TCOM) { - /* shell statement */ - t = block(TPAREN, t, NOBLOCK, NOWORDS); - } - t = block(TPIPE, t, p, NOWORDS); - } - peeksym = c; - } - return(t); -} - -static struct op * -andor() -{ - register struct op *t, *p; - register int c; - - t = pipeline(0); - if (t != NULL) { - while ((c = yylex(0)) == LOGAND || c == LOGOR) { - if ((p = pipeline(CONTIN)) == NULL) - SYNTAXERR; - t = block(c == LOGAND? TAND: TOR, t, p, NOWORDS); - } - peeksym = c; - } - return(t); -} - -static struct op * -c_list() -{ - register struct op *t, *p; - register int c; - - t = andor(); - if (t != NULL) { - if((peeksym = yylex(0)) == '&') - t = block(TASYNC, t, NOBLOCK, NOWORDS); - while ((c = yylex(0)) == ';' || c == '&' || (multiline && c == '\n')) { - if ((p = andor()) == NULL) - return(t); - if((peeksym = yylex(0)) == '&') - p = block(TASYNC, p, NOBLOCK, NOWORDS); - t = list(t, p); - } - peeksym = c; - } - return(t); -} - - -static int -synio(cf) -int cf; -{ - register struct ioword *iop; - register int i; - register int c; - - if ((c = yylex(cf)) != '<' && c != '>') { - peeksym = c; - return(0); - } - i = yylval.i; - musthave(WORD, 0); - iop = io(iounit, i, yylval.cp); - iounit = IODEFAULT; - if (i & IOHERE) - markhere(yylval.cp, iop); - return(1); -} - -static void -musthave(c, cf) -int c, cf; -{ - if ((peeksym = yylex(cf)) != c) - SYNTAXERR; - peeksym = 0; -} - -static struct op * -simple() -{ - register struct op *t; - - t = NULL; - for (;;) { - switch (peeksym = yylex(0)) { - case '<': - case '>': - (void) synio(0); - break; - - case WORD: - if (t == NULL) { - t = newtp(); - t->type = TCOM; - } - peeksym = 0; - word(yylval.cp); - break; - - default: - return(t); - } - } -} - -static struct op * -nested(type, mark) -int type, mark; -{ - register struct op *t; - - multiline++; - t = c_list(); - musthave(mark, 0); - multiline--; - return(block(type, t, NOBLOCK, NOWORDS)); -} - -static struct op * -command(cf) -int cf; -{ - register struct op *t; - struct wdblock *iosave; - register int c; - - iosave = iolist; - iolist = NULL; - if (multiline) - cf |= CONTIN; - while (synio(cf)) - cf = 0; - switch (c = yylex(cf)) { - default: - peeksym = c; - if ((t = simple()) == NULL) { - if (iolist == NULL) - return((struct op *)NULL); - t = newtp(); - t->type = TCOM; - } - break; - - case '(': - t = nested(TPAREN, ')'); - break; - - case '{': - t = nested(TBRACE, '}'); - break; - - case FOR: - t = newtp(); - t->type = TFOR; - musthave(WORD, 0); - startl = 1; - t->str = yylval.cp; - multiline++; - t->words = wordlist(); - if ((c = yylex(0)) != '\n' && c != ';') - peeksym = c; - t->left = dogroup(0); - multiline--; - break; - - case WHILE: - case UNTIL: - multiline++; - t = newtp(); - t->type = c == WHILE? TWHILE: TUNTIL; - t->left = c_list(); - t->right = dogroup(1); - t->words = NULL; - multiline--; - break; - - case CASE: - t = newtp(); - t->type = TCASE; - musthave(WORD, 0); - t->str = yylval.cp; - startl++; - multiline++; - musthave(IN, CONTIN); - startl++; - t->left = caselist(); - musthave(ESAC, 0); - multiline--; - break; - - case IF: - multiline++; - t = newtp(); - t->type = TIF; - t->left = c_list(); - t->right = thenpart(); - musthave(FI, 0); - multiline--; - break; - } - while (synio(0)) - ; - t = namelist(t); - iolist = iosave; - return(t); -} - -static struct op * -dogroup(onlydone) -int onlydone; -{ - register int c; - register struct op *mylist; - - c = yylex(CONTIN); - if (c == DONE && onlydone) - return((struct op *)NULL); - if (c != DO) - SYNTAXERR; - mylist = c_list(); - musthave(DONE, 0); - return(mylist); -} - -static struct op * -thenpart() -{ - register int c; - register struct op *t; - - if ((c = yylex(0)) != THEN) { - peeksym = c; - return((struct op *)NULL); - } - t = newtp(); - t->type = 0; - t->left = c_list(); - if (t->left == NULL) - SYNTAXERR; - t->right = elsepart(); - return(t); -} - -static struct op * -elsepart() -{ - register int c; - register struct op *t; - - switch (c = yylex(0)) { - case ELSE: - if ((t = c_list()) == NULL) - SYNTAXERR; - return(t); - - case ELIF: - t = newtp(); - t->type = TELIF; - t->left = c_list(); - t->right = thenpart(); - return(t); - - default: - peeksym = c; - return((struct op *)NULL); - } -} - -static struct op * -caselist() -{ - register struct op *t; - - t = NULL; - while ((peeksym = yylex(CONTIN)) != ESAC) - t = list(t, casepart()); - return(t); -} - -static struct op * -casepart() -{ - register struct op *t; - - t = newtp(); - t->type = TPAT; - t->words = pattern(); - musthave(')', 0); - t->left = c_list(); - if ((peeksym = yylex(CONTIN)) != ESAC) - musthave(BREAK, CONTIN); - return(t); -} - -static char ** -pattern() -{ - register int c, cf; - - cf = CONTIN; - do { - musthave(WORD, cf); - word(yylval.cp); - cf = 0; - } while ((c = yylex(0)) == '|'); - peeksym = c; - word(NOWORD); - return(copyw()); -} - -static char ** -wordlist() -{ - register int c; - - if ((c = yylex(0)) != IN) { - peeksym = c; - return((char **)NULL); - } - startl = 0; - while ((c = yylex(0)) == WORD) - word(yylval.cp); - word(NOWORD); - peeksym = c; - return(copyw()); -} - -/* - * supporting functions - */ -static struct op * -list(t1, t2) -register struct op *t1, *t2; -{ - if (t1 == NULL) - return(t2); - if (t2 == NULL) - return(t1); - return(block(TLIST, t1, t2, NOWORDS)); -} - -static struct op * -block(type, t1, t2, wp) -int type; -struct op *t1, *t2; -char **wp; -{ - register struct op *t; - - t = newtp(); - t->type = type; - t->left = t1; - t->right = t2; - t->words = wp; - return(t); -} - -static int -rlookup(n) -register char *n; -{ - register struct res *rp; - - for (rp = restab; rp->r_name; rp++) - if (strcmp(rp->r_name, n) == 0) - return(rp->r_val); - return(0); -} - -static struct op * -newtp() -{ - register struct op *t; - - t = (struct op *)tree(sizeof(*t)); - t->type = 0; - t->words = NULL; - t->ioact = NULL; - t->left = NULL; - t->right = NULL; - t->str = NULL; - return(t); -} - -static struct op * -namelist(t) -register struct op *t; -{ - if (iolist) { - iolist = addword((char *)NULL, iolist); - t->ioact = copyio(); - } else - t->ioact = NULL; - if (t->type != TCOM) { - if (t->type != TPAREN && t->ioact != NULL) { - t = block(TPAREN, t, NOBLOCK, NOWORDS); - t->ioact = t->left->ioact; - t->left->ioact = NULL; - } - return(t); - } - word(NOWORD); - t->words = copyw(); - return(t); -} - -static char ** -copyw() -{ - register char **wd; - - wd = getwords(wdlist); - wdlist = 0; - return(wd); -} - -static void -word(cp) -char *cp; -{ - wdlist = addword(cp, wdlist); -} - -static struct ioword ** -copyio() -{ - register struct ioword **iop; - - iop = (struct ioword **) getwords(iolist); - iolist = 0; - return(iop); -} - -static struct ioword * -io(u, f, cp) -int u; -int f; -char *cp; -{ - register struct ioword *iop; - - iop = (struct ioword *) tree(sizeof(*iop)); - iop->io_unit = u; - iop->io_flag = f; - iop->io_name = cp; - iolist = addword((char *)iop, iolist); - return(iop); -} - -static void -zzerr() -{ - yyerror("syntax error"); -} - -static void -yyerror(s) -char *s; -{ - yynerrs++; - if (interactive && e.iop <= iostack) { - multiline = 0; - while (eofc() == 0 && yylex(0) != '\n') - ; - } - err(s); - fail(); -} - -static int -yylex(cf) -int cf; -{ - register int c, c1; - int atstart; - - if ((c = peeksym) > 0) { - peeksym = 0; - if (c == '\n') - startl = 1; - return(c); - } - nlseen = 0; - e.linep = line; - atstart = startl; - startl = 0; - yylval.i = 0; - -loop: - while ((c = my_getc(0)) == ' ' || c == '\t') - ; - switch (c) { - default: - if (any(c, "0123456789")) { - unget(c1 = my_getc(0)); - if (c1 == '<' || c1 == '>') { - iounit = c - '0'; - goto loop; - } - *e.linep++ = c; - c = c1; - } - break; - - case '#': - while ((c = my_getc(0)) != 0 && c != '\n') - ; - unget(c); - goto loop; - - case 0: - return(c); - - case '$': - *e.linep++ = c; - if ((c = my_getc(0)) == '{') { - if ((c = collect(c, '}')) != '\0') - return(c); - goto pack; - } - break; - - case '`': - case '\'': - case '"': - if ((c = collect(c, c)) != '\0') - return(c); - goto pack; - - case '|': - case '&': - case ';': - if ((c1 = dual(c)) != '\0') { - startl = 1; - return(c1); - } - startl = 1; - return(c); - case '^': - startl = 1; - return('|'); - case '>': - case '<': - diag(c); - return(c); - - case '\n': - nlseen++; - gethere(); - startl = 1; - if (multiline || cf & CONTIN) { - if (interactive && e.iop <= iostack) { -#ifdef BB_FEATURE_COMMAND_EDITING - current_prompt=cprompt->value; -#else - prs(cprompt->value); -#endif - } - if (cf & CONTIN) - goto loop; - } - return(c); - - case '(': - case ')': - startl = 1; - return(c); - } - - unget(c); - -pack: - while ((c = my_getc(0)) != 0 && !any(c, "`$ '\"\t;&<>()|^\n")) - if (e.linep >= elinep) - err("word too long"); - else - *e.linep++ = c; - unget(c); - if(any(c, "\"'`$")) - goto loop; - *e.linep++ = '\0'; - if (atstart && (c = rlookup(line))!=0) { - startl = 1; - return(c); - } - yylval.cp = strsave(line, areanum); - return(WORD); -} - -static int -collect(c, c1) -register int c, c1; -{ - char s[2]; - - *e.linep++ = c; - while ((c = my_getc(c1)) != c1) { - if (c == 0) { - unget(c); - s[0] = c1; - s[1] = 0; - prs("no closing "); yyerror(s); - return(YYERRCODE); - } - if (interactive && c == '\n' && e.iop <= iostack) { -#ifdef BB_FEATURE_COMMAND_EDITING - current_prompt=cprompt->value; -#else - prs(cprompt->value); -#endif - } - *e.linep++ = c; - } - *e.linep++ = c; - return(0); -} - -static int -dual(c) -register int c; -{ - char s[3]; - register char *cp = s; - - *cp++ = c; - *cp++ = my_getc(0); - *cp = 0; - if ((c = rlookup(s)) == 0) - unget(*--cp); - return(c); -} - -static void -diag(ec) -register int ec; -{ - register int c; - - c = my_getc(0); - if (c == '>' || c == '<') { - if (c != ec) - zzerr(); - yylval.i = ec == '>'? IOWRITE|IOCAT: IOHERE; - c = my_getc(0); - } else - yylval.i = ec == '>'? IOWRITE: IOREAD; - if (c != '&' || yylval.i == IOHERE) - unget(c); - else - yylval.i |= IODUP; -} - -static char * -tree(size) -unsigned size; -{ - register char *t; - - if ((t = getcell(size)) == NULL) { - prs("command line too complicated\n"); - fail(); - /* NOTREACHED */ - } - return(t); -} - -/* VARARGS1 */ -/* ARGSUSED */ - -/* -------- exec.c -------- */ - -/* - * execute tree - */ - - -static int -execute(t, pin, pout, act) -register struct op *t; -int *pin, *pout; -int act; -{ - register struct op *t1; - volatile int i, rv, a; - char *cp, **wp, **wp2; - struct var *vp; - struct brkcon bc; - -#if __GNUC__ - /* Avoid longjmp clobbering */ - (void) ℘ -#endif - - - if (t == NULL) - return(0); - rv = 0; - a = areanum++; - wp = (wp2 = t->words) != NULL - ? eval(wp2, t->type == TCOM ? DOALL : DOALL & ~DOKEY) - : NULL; - - switch(t->type) { - case TPAREN: - case TCOM: - { - int child; - rv = forkexec(t, pin, pout, act, wp, &child); - if (child) { - exstat = rv; - leave(); - } - } - break; - - case TPIPE: - { - int pv[2]; - if ((rv = openpipe(pv)) < 0) - break; - pv[0] = remap(pv[0]); - pv[1] = remap(pv[1]); - (void) execute(t->left, pin, pv, 0); - rv = execute(t->right, pv, pout, 0); - } - break; - - case TLIST: - (void) execute(t->left, pin, pout, 0); - rv = execute(t->right, pin, pout, 0); - break; - - case TASYNC: - { - int hinteractive = interactive; - - i = vfork(); - if (i != 0) { - interactive = hinteractive; - if (i != -1) { - setval(lookup("!"), putn(i)); - if (pin != NULL) - closepipe(pin); - if (interactive) { - prs(putn(i)); - prs("\n"); - } - } else - rv = -1; - setstatus(rv); - } else { - signal(SIGINT, SIG_IGN); - signal(SIGQUIT, SIG_IGN); - if (interactive) - signal(SIGTERM, SIG_DFL); - interactive = 0; - if (pin == NULL) { - close(0); - open("/dev/null", 0); - } - exit(execute(t->left, pin, pout, FEXEC)); - } - } - break; - - case TOR: - case TAND: - rv = execute(t->left, pin, pout, 0); - if ((t1 = t->right)!=NULL && (rv == 0) == (t->type == TAND)) - rv = execute(t1, pin, pout, 0); - break; - - case TFOR: - if (wp == NULL) { - wp = dolv+1; - if ((i = dolc) < 0) - i = 0; - } else { - i = -1; - while (*wp++ != NULL) - ; - } - vp = lookup(t->str); - while (setjmp(bc.brkpt)) - if (isbreak) - goto broken; - brkset(&bc); - for (t1 = t->left; i-- && *wp != NULL;) { - setval(vp, *wp++); - rv = execute(t1, pin, pout, 0); - } - brklist = brklist->nextlev; - break; - - case TWHILE: - case TUNTIL: - while (setjmp(bc.brkpt)) - if (isbreak) - goto broken; - brkset(&bc); - t1 = t->left; - while ((execute(t1, pin, pout, 0) == 0) == (t->type == TWHILE)) - rv = execute(t->right, pin, pout, 0); - brklist = brklist->nextlev; - break; - - case TIF: - case TELIF: - if (t->right != NULL) { - rv = !execute(t->left, pin, pout, 0) ? - execute(t->right->left, pin, pout, 0): - execute(t->right->right, pin, pout, 0); - } - break; - - case TCASE: - if ((cp = evalstr(t->str, DOSUB|DOTRIM)) == 0) - cp = ""; - if ((t1 = findcase(t->left, cp)) != NULL) - rv = execute(t1, pin, pout, 0); - break; - - case TBRACE: -/* - if (iopp = t->ioact) - while (*iopp) - if (iosetup(*iopp++, pin!=NULL, pout!=NULL)) { - rv = -1; - break; - } -*/ - if (rv >= 0 && (t1 = t->left)) - rv = execute(t1, pin, pout, 0); - break; - } - -broken: - t->words = wp2; - isbreak = 0; - freehere(areanum); - freearea(areanum); - areanum = a; - if (interactive && intr) { - closeall(); - fail(); - } - if ((i = trapset) != 0) { - trapset = 0; - runtrap(i); - } - return(rv); -} - -static int -forkexec( register struct op *t, int *pin, int *pout, int act, char **wp, int *pforked) -{ - int i, rv; - int (*shcom)() = NULL; - register int f; - char *cp = NULL; - struct ioword **iopp; - int resetsig; - char **owp; - - int *hpin = pin; - int *hpout = pout; - int hforked; - char *hwp; - int hinteractive; - int hintr; - struct brkcon * hbrklist; - int hexecflg; - -#if __GNUC__ - /* Avoid longjmp clobbering */ - (void) &pin; - (void) &pout; - (void) ℘ - (void) &shcom; - (void) &cp; - (void) &resetsig; - (void) &owp; -#endif - - owp = wp; - resetsig = 0; - *pforked = 0; - rv = -1; /* system-detected error */ - if (t->type == TCOM) { - while ((cp = *wp++) != NULL) - ; - cp = *wp; - - /* strip all initial assignments */ - /* not correct wrt PATH=yyy command etc */ - if (flag['x']) - echo (cp ? wp: owp); - if (cp == NULL && t->ioact == NULL) { - while ((cp = *owp++) != NULL && assign(cp, COPYV)) - ; - return(setstatus(0)); - } - else if (cp != NULL) - shcom = inbuilt(cp); - } - t->words = wp; - f = act; - if (shcom == NULL && (f & FEXEC) == 0) { - - hpin = pin; - hpout = pout; - hforked = *pforked; - hwp = *wp; - hinteractive = interactive; - hintr = intr; - hbrklist = brklist; - hexecflg = execflg; - - i = vfork(); - if (i != 0) { - /* who wrote this crappy non vfork safe shit? */ - pin = hpin; - pout = hpout; - *pforked = hforked; - *wp = hwp; - interactive = hinteractive; - intr = hintr; - brklist = hbrklist; - execflg = hexecflg; - - *pforked = 0; - if (i == -1) - return(rv); - if (pin != NULL) - closepipe(pin); - return(pout==NULL? setstatus(waitfor(i,0)): 0); - } - - if (interactive) { - signal(SIGINT, SIG_IGN); - signal(SIGQUIT, SIG_IGN); - resetsig = 1; - } - interactive = 0; - intr = 0; - (*pforked)++; - brklist = 0; - execflg = 0; - } - if (owp != NULL) - while ((cp = *owp++) != NULL && assign(cp, COPYV)) - if (shcom == NULL) - export(lookup(cp)); -#ifdef COMPIPE - if ((pin != NULL || pout != NULL) && shcom != NULL && shcom != doexec) { - err("piping to/from shell builtins not yet done"); - return(-1); - } -#endif - if (pin != NULL) { - dup2(pin[0], 0); - closepipe(pin); - } - if (pout != NULL) { - dup2(pout[1], 1); - closepipe(pout); - } - if ((iopp = t->ioact) != NULL) { - if (shcom != NULL && shcom != doexec) { - prs(cp); - err(": cannot redirect shell command"); - return(-1); - } - while (*iopp) - if (iosetup(*iopp++, pin!=NULL, pout!=NULL)) - return(rv); - } - if (shcom) - return(setstatus((*shcom)(t))); - /* should use FIOCEXCL */ - for (i=FDBASE; i<NOFILE; i++) - close(i); - if (resetsig) { - signal(SIGINT, SIG_DFL); - signal(SIGQUIT, SIG_DFL); - } - if (t->type == TPAREN) - exit(execute(t->left, NOPIPE, NOPIPE, FEXEC)); - if (wp[0] == NULL) - exit(0); - - cp = rexecve(wp[0], wp, makenv()); - prs(wp[0]); prs(": "); warn(cp); - if (!execflg) - trap[0] = NULL; - leave(); - /* NOTREACHED */ - exit(1); -} - -/* - * 0< 1> are ignored as required - * within pipelines. - */ -static int -iosetup(iop, pipein, pipeout) -register struct ioword *iop; -int pipein, pipeout; -{ - register int u = -1; - char *cp=NULL, *msg; - - if (iop->io_unit == IODEFAULT) /* take default */ - iop->io_unit = iop->io_flag&(IOREAD|IOHERE)? 0: 1; - if (pipein && iop->io_unit == 0) - return(0); - if (pipeout && iop->io_unit == 1) - return(0); - msg = iop->io_flag&(IOREAD|IOHERE)? "open": "create"; - if ((iop->io_flag & IOHERE) == 0) { - cp = iop->io_name; - if ((cp = evalstr(cp, DOSUB|DOTRIM)) == NULL) - return(1); - } - if (iop->io_flag & IODUP) { - if (cp[1] || (!isdigit(*cp) && *cp != '-')) { - prs(cp); - err(": illegal >& argument"); - return(1); - } - if (*cp == '-') - iop->io_flag = IOCLOSE; - iop->io_flag &= ~(IOREAD|IOWRITE); - } - switch (iop->io_flag) { - case IOREAD: - u = open(cp, 0); - break; - - case IOHERE: - case IOHERE|IOXHERE: - u = herein(iop->io_name, iop->io_flag&IOXHERE); - cp = "here file"; - break; - - case IOWRITE|IOCAT: - if ((u = open(cp, 1)) >= 0) { - lseek(u, (long)0, 2); - break; - } - case IOWRITE: - u = creat(cp, 0666); - break; - - case IODUP: - u = dup2(*cp-'0', iop->io_unit); - break; - - case IOCLOSE: - close(iop->io_unit); - return(0); - } - if (u < 0) { - prs(cp); - prs(": cannot "); - warn(msg); - return(1); - } else { - if (u != iop->io_unit) { - dup2(u, iop->io_unit); - close(u); - } - } - return(0); -} - -static void -echo(wp) -register char **wp; -{ - register int i; - - prs("+"); - for (i=0; wp[i]; i++) { - if (i) - prs(" "); - prs(wp[i]); - } - prs("\n"); -} - -static struct op ** -find1case(t, w) -struct op *t; -char *w; -{ - register struct op *t1; - struct op **tp; - register char **wp, *cp; - - if (t == NULL) - return((struct op **)NULL); - if (t->type == TLIST) { - if ((tp = find1case(t->left, w)) != NULL) - return(tp); - t1 = t->right; /* TPAT */ - } else - t1 = t; - for (wp = t1->words; *wp;) - if ((cp = evalstr(*wp++, DOSUB)) && gmatch(w, cp)) - return(&t1->left); - return((struct op **)NULL); -} - -static struct op * -findcase(t, w) -struct op *t; -char *w; -{ - register struct op **tp; - - return((tp = find1case(t, w)) != NULL? *tp: (struct op *)NULL); -} - -/* - * Enter a new loop level (marked for break/continue). - */ -static void -brkset(bc) -struct brkcon *bc; -{ - bc->nextlev = brklist; - brklist = bc; -} - -/* - * Wait for the last process created. - * Print a message for each process found - * that was killed by a signal. - * Ignore interrupt signals while waiting - * unless `canintr' is true. - */ -static int -waitfor(lastpid, canintr) -register int lastpid; -int canintr; -{ - register int pid, rv; - int s; - int oheedint = heedint; - - heedint = 0; - rv = 0; - do { - pid = wait(&s); - if (pid == -1) { - if (errno != EINTR || canintr) - break; - } else { - if ((rv = WAITSIG(s)) != 0) { - if (rv < NSIGNAL) { - if (signame[rv] != NULL) { - if (pid != lastpid) { - prn(pid); - prs(": "); - } - prs(signame[rv]); - } - } else { - if (pid != lastpid) { - prn(pid); - prs(": "); - } - prs("Signal "); prn(rv); prs(" "); - } - if (WAITCORE(s)) - prs(" - core dumped"); - if (rv >= NSIGNAL || signame[rv]) - prs("\n"); - rv = -1; - } else - rv = WAITVAL(s); - } - } while (pid != lastpid); - heedint = oheedint; - if (intr) { - if (interactive) { - if (canintr) - intr = 0; - } else { - if (exstat == 0) exstat = rv; - onintr(0); - } - } - return(rv); -} - -static int -setstatus(s) -register int s; -{ - exstat = s; - setval(lookup("?"), putn(s)); - return(s); -} - -/* - * PATH-searching interface to execve. - * If getenv("PATH") were kept up-to-date, - * execvp might be used. - */ -static char * -rexecve(c, v, envp) -char *c, **v, **envp; -{ - register int i; - register char *sp, *tp; - int eacces = 0, asis = 0; - -#ifdef BB_FEATURE_SH_STANDALONE_SHELL - char *name = c; -#ifdef BB_FEATURE_SH_APPLETS_ALWAYS_WIN - name = get_last_path_component(name); -#endif - optind = 1; - if (find_applet_by_name(name)) { - /* We have to exec here since we vforked. Running - * run_applet_by_name() won't work and bad things - * will happen. */ - execve("/proc/self/exe", v, envp); - execve("busybox", v, envp); - } -#endif - - sp = any('/', c)? "": path->value; - asis = *sp == '\0'; - while (asis || *sp != '\0') { - asis = 0; - tp = e.linep; - for (; *sp != '\0'; tp++) - if ((*tp = *sp++) == ':') { - asis = *sp == '\0'; - break; - } - if (tp != e.linep) - *tp++ = '/'; - for (i = 0; (*tp++ = c[i++]) != '\0';) - ; - - execve(e.linep, v, envp); - switch (errno) { - case ENOEXEC: - *v = e.linep; - tp = *--v; - *v = e.linep; - execve("/bin/sh", v, envp); - *v = tp; - return("no Shell"); - - case ENOMEM: - return("program too big"); - - case E2BIG: - return("argument list too long"); - - case EACCES: - eacces++; - break; - } - } - return(errno==ENOENT ? "not found" : "cannot execute"); -} - -/* - * Run the command produced by generator `f' - * applied to stream `arg'. - */ -static int -run(argp, f) -struct ioarg *argp; -int (*f)(); -{ - struct op *otree; - struct wdblock *swdlist; - struct wdblock *siolist; - jmp_buf ev, rt; - xint *ofail; - int rv; - -#if __GNUC__ - /* Avoid longjmp clobbering */ - (void) &rv; -#endif - - areanum++; - swdlist = wdlist; - siolist = iolist; - otree = outtree; - ofail = failpt; - rv = -1; - if (newenv(setjmp(errpt = ev)) == 0) { - wdlist = 0; - iolist = 0; - pushio(argp, f); - e.iobase = e.iop; - yynerrs = 0; - if (setjmp(failpt = rt) == 0 && yyparse() == 0) - rv = execute(outtree, NOPIPE, NOPIPE, 0); - quitenv(); - } - wdlist = swdlist; - iolist = siolist; - failpt = ofail; - outtree = otree; - freearea(areanum--); - return(rv); -} - -/* -------- do.c -------- */ - -/* - * built-in commands: doX - */ - -static int dohelp() -{ - int col; - const struct builtincmd *x; - - printf("\nBuilt-in commands:\n"); - printf("-------------------\n"); - - for (col=0, x = builtincmds; x->builtinfunc != NULL; x++) { - if (!x->name) - continue; - col += printf("%s%s", ((col == 0) ? "\t" : " "), x->name); - if (col > 60) { - printf("\n"); - col = 0; - } - } -#ifdef BB_FEATURE_SH_STANDALONE_SHELL - { - int i; - const struct BB_applet *applet; - extern const struct BB_applet applets[]; - extern const size_t NUM_APPLETS; - - for (i=0, applet = applets; i < NUM_APPLETS; applet++, i++) { - if (!applet->name) - continue; - - col += printf("%s%s", ((col == 0) ? "\t" : " "), - applet->name); - if (col > 60) { - printf("\n"); - col = 0; - } - } - } -#endif - printf("\n\n"); - return EXIT_SUCCESS; -} - - - -static int -dolabel() -{ - return(0); -} - -static int -dochdir(t) -register struct op *t; -{ - register char *cp, *er; - - if ((cp = t->words[1]) == NULL && (cp = homedir->value) == NULL) - er = ": no home directory"; - else if(chdir(cp) < 0) - er = ": bad directory"; - else - return(0); - prs(cp != NULL? cp: "cd"); - err(er); - return(1); -} - -static int -doshift(t) -register struct op *t; -{ - register int n; - - n = t->words[1]? getn(t->words[1]): 1; - if(dolc < n) { - err("nothing to shift"); - return(1); - } - dolv[n] = dolv[0]; - dolv += n; - dolc -= n; - setval(lookup("#"), putn(dolc)); - return(0); -} - -/* - * execute login and newgrp directly - */ -static int -dologin(t) -struct op *t; -{ - register char *cp; - - if (interactive) { - signal(SIGINT, SIG_DFL); - signal(SIGQUIT, SIG_DFL); - } - cp = rexecve(t->words[0], t->words, makenv()); - prs(t->words[0]); prs(": "); err(cp); - return(1); -} - -static int -doumask(t) -register struct op *t; -{ - register int i, n; - register char *cp; - - if ((cp = t->words[1]) == NULL) { - i = umask(0); - umask(i); - for (n=3*4; (n-=3) >= 0;) - putc('0'+((i>>n)&07), stderr); - putc('\n', stderr); - } else { - for (n=0; *cp>='0' && *cp<='9'; cp++) - n = n*8 + (*cp-'0'); - umask(n); - } - return(0); -} - -static int -doexec(t) -register struct op *t; -{ - register int i; - jmp_buf ex; - xint *ofail; - - t->ioact = NULL; - for(i = 0; (t->words[i]=t->words[i+1]) != NULL; i++) - ; - if (i == 0) - return(1); - execflg = 1; - ofail = failpt; - if (setjmp(failpt = ex) == 0) - execute(t, NOPIPE, NOPIPE, FEXEC); - failpt = ofail; - execflg = 0; - return(1); -} - -static int -dodot(t) -struct op *t; -{ - register int i; - register char *sp, *tp; - char *cp; - - if ((cp = t->words[1]) == NULL) - return(0); - sp = any('/', cp)? ":": path->value; - while (*sp) { - tp = e.linep; - while (*sp && (*tp = *sp++) != ':') - tp++; - if (tp != e.linep) - *tp++ = '/'; - for (i = 0; (*tp++ = cp[i++]) != '\0';) - ; - if ((i = open(e.linep, 0)) >= 0) { - exstat = 0; - next(remap(i)); - return(exstat); - } - } - prs(cp); - err(": not found"); - return(-1); -} - -static int -dowait(t) -struct op *t; -{ - register int i; - register char *cp; - - if ((cp = t->words[1]) != NULL) { - i = getn(cp); - if (i == 0) - return(0); - } else - i = -1; - setstatus(waitfor(i, 1)); - return(0); -} - -static int -doread(t) -struct op *t; -{ - register char *cp, **wp; - register int nb = 0; - register int nl = 0; - - if (t->words[1] == NULL) { - err("Usage: read name ..."); - return(1); - } - for (wp = t->words+1; *wp; wp++) { - for (cp = e.linep; !nl && cp < elinep-1; cp++) - if ((nb = read(0, cp, sizeof(*cp))) != sizeof(*cp) || - (nl = (*cp == '\n')) || - (wp[1] && any(*cp, ifs->value))) - break; - *cp = 0; - if (nb <= 0) - break; - setval(lookup(*wp), e.linep); - } - return(nb <= 0); -} - -static int -doeval(t) -register struct op *t; -{ - return(RUN(awordlist, t->words+1, wdchar)); -} - -static int -dotrap(t) -register struct op *t; -{ - register int n, i; - register int resetsig; - - if (t->words[1] == NULL) { - for (i=0; i<=_NSIG; i++) - if (trap[i]) { - prn(i); - prs(": "); - prs(trap[i]); - prs("\n"); - } - return(0); - } - resetsig = isdigit(*t->words[1]); - for (i = resetsig ? 1 : 2; t->words[i] != NULL; ++i) { - n = getsig(t->words[i]); - freecell(trap[n]); - trap[n] = 0; - if (!resetsig) { - if (*t->words[1] != '\0') { - trap[n] = strsave(t->words[1], 0); - setsig(n, sig); - } else - setsig(n, SIG_IGN); - } else { - if (interactive) - if (n == SIGINT) - setsig(n, onintr); - else - setsig(n, n == SIGQUIT ? SIG_IGN - : SIG_DFL); - else - setsig(n, SIG_DFL); - } - } - return(0); -} - -static int -getsig(s) -char *s; -{ - register int n; - - if ((n = getn(s)) < 0 || n > _NSIG) { - err("trap: bad signal number"); - n = 0; - } - return(n); -} - -static void -setsig( register int n, void (*f)(int)) -{ - if (n == 0) - return; - if (signal(n, SIG_IGN) != SIG_IGN || ourtrap[n]) { - ourtrap[n] = 1; - signal(n, f); - } -} - -static int -getn(as) -char *as; -{ - register char *s; - register int n, m; - - s = as; - m = 1; - if (*s == '-') { - m = -1; - s++; - } - for (n = 0; isdigit(*s); s++) - n = (n*10) + (*s-'0'); - if (*s) { - prs(as); - err(": bad number"); - } - return(n*m); -} - -static int -dobreak(t) -struct op *t; -{ - return(brkcontin(t->words[1], 1)); -} - -static int -docontinue(t) -struct op *t; -{ - return(brkcontin(t->words[1], 0)); -} - -static int -brkcontin(cp, val) -register char *cp; -int val; -{ - register struct brkcon *bc; - register int nl; - - nl = cp == NULL? 1: getn(cp); - if (nl <= 0) - nl = 999; - do { - if ((bc = brklist) == NULL) - break; - brklist = bc->nextlev; - } while (--nl); - if (nl) { - err("bad break/continue level"); - return(1); - } - isbreak = val; - longjmp(bc->brkpt, 1); - /* NOTREACHED */ -} - -static int -doexit(t) -struct op *t; -{ - register char *cp; - - execflg = 0; - if ((cp = t->words[1]) != NULL) - setstatus(getn(cp)); - leave(); - /* NOTREACHED */ - return(0); -} - -static int -doexport(t) -struct op *t; -{ - rdexp(t->words+1, export, EXPORT); - return(0); -} - -static int -doreadonly(t) -struct op *t; -{ - rdexp(t->words+1, ronly, RONLY); - return(0); -} - -static void -rdexp(wp, f, key) -register char **wp; -void (*f)(); -int key; -{ - if (*wp != NULL) { - for (; *wp != NULL; wp++) { - if (isassign(*wp)) { - char *cp; - assign(*wp, COPYV); - for (cp = *wp; *cp != '='; cp++) - ; - *cp = '\0'; - } - if (checkname(*wp)) - (*f)(lookup(*wp)); - else - badid(*wp); - } - } else - putvlist(key, 1); -} - -static void -badid(s) -register char *s; -{ - prs(s); - err(": bad identifier"); -} - -static int -doset(t) -register struct op *t; -{ - register struct var *vp; - register char *cp; - register int n; - - if ((cp = t->words[1]) == NULL) { - for (vp = vlist; vp; vp = vp->next) - varput(vp->name, 1); - return(0); - } - if (*cp == '-') { - /* bad: t->words++; */ - for(n = 0; (t->words[n]=t->words[n+1]) != NULL; n++) - ; - if (*++cp == 0) - flag['x'] = flag['v'] = 0; - else - for (; *cp; cp++) - switch (*cp) { - case 'e': - if (!interactive) - flag['e']++; - break; - - default: - if (*cp>='a' && *cp<='z') - flag[(int)*cp]++; - break; - } - setdash(); - } - if (t->words[1]) { - t->words[0] = dolv[0]; - for (n=1; t->words[n]; n++) - setarea((char *)t->words[n], 0); - dolc = n-1; - dolv = t->words; - setval(lookup("#"), putn(dolc)); - setarea((char *)(dolv-1), 0); - } - return(0); -} - -static void -varput(s, out) -register char *s; -int out; -{ - if (isalnum(*s) || *s == '_') { - write(out, s, strlen(s)); - write(out, "\n", 1); - } -} - - -/* - * Copyright (c) 1999 Herbert Xu <herbert@debian.org> - * This file contains code for the times builtin. - */ -static int dotimes () -{ - struct tms buf; - long int clk_tck = sysconf(_SC_CLK_TCK); - - times(&buf); - printf("%dm%fs %dm%fs\n%dm%fs %dm%fs\n", - (int) (buf.tms_utime / clk_tck / 60), - ((double) buf.tms_utime) / clk_tck, - (int) (buf.tms_stime / clk_tck / 60), - ((double) buf.tms_stime) / clk_tck, - (int) (buf.tms_cutime / clk_tck / 60), - ((double) buf.tms_cutime) / clk_tck, - (int) (buf.tms_cstime / clk_tck / 60), - ((double) buf.tms_cstime) / clk_tck); - return 0; -} - - -static int (*inbuilt(char *s))() -{ - const struct builtincmd *bp; - - for (bp = builtincmds; bp->name != NULL; bp++) - if (strcmp(bp->name, s) == 0) - return(bp->builtinfunc); - - return((int(*)())NULL); -} - -/* -------- eval.c -------- */ - -/* - * ${} - * `command` - * blank interpretation - * quoting - * glob - */ - -static char ** eval( char **ap, int f) -{ - struct wdblock *wb; - char **wp; - char **wf; - jmp_buf ev; - -#if __GNUC__ - /* Avoid longjmp clobbering */ - (void) ℘ - (void) ≈ -#endif - wp = NULL; - wb = NULL; - wf = NULL; - if (newenv(setjmp(errpt = ev)) == 0) { - while (*ap && isassign(*ap)) - expand(*ap++, &wb, f & ~DOGLOB); - if (flag['k']) { - for (wf = ap; *wf; wf++) { - if (isassign(*wf)) - expand(*wf, &wb, f & ~DOGLOB); - } - } - for (wb = addword((char *)0, wb); *ap; ap++) { - if (!flag['k'] || !isassign(*ap)) - expand(*ap, &wb, f & ~DOKEY); - } - wb = addword((char *)0, wb); - wp = getwords(wb); - quitenv(); - } else - gflg = 1; - return(gflg? (char **)NULL: wp); -} - -/* - * Make the exported environment from the exported - * names in the dictionary. Keyword assignments - * will already have been done. - */ -static char ** -makenv() - -{ - register struct wdblock *wb; - register struct var *vp; - - wb = NULL; - for (vp = vlist; vp; vp = vp->next) - if (vp->status & EXPORT) - wb = addword(vp->name, wb); - wb = addword((char *)0, wb); - return(getwords(wb)); -} - -static char * -evalstr(cp, f) -register char *cp; -int f; -{ - struct wdblock *wb; - - wb = NULL; - if (expand(cp, &wb, f)) { - if (wb == NULL || wb->w_nword == 0 || (cp = wb->w_words[0]) == NULL) - cp = ""; - DELETE(wb); - } else - cp = NULL; - return(cp); -} - -static int -expand( char *cp, register struct wdblock **wbp, int f) -{ - jmp_buf ev; - -#if __GNUC__ - /* Avoid longjmp clobbering */ - (void) &cp; -#endif - gflg = 0; - if (cp == NULL) - return(0); - if (!anys("$`'\"", cp) && - !anys(ifs->value, cp) && - ((f&DOGLOB)==0 || !anys("[*?", cp))) { - cp = strsave(cp, areanum); - if (f & DOTRIM) - unquote(cp); - *wbp = addword(cp, *wbp); - return(1); - } - if (newenv(setjmp(errpt = ev)) == 0) { - PUSHIO(aword, cp, strchar); - e.iobase = e.iop; - while ((cp = blank(f)) && gflg == 0) { - e.linep = cp; - cp = strsave(cp, areanum); - if ((f&DOGLOB) == 0) { - if (f & DOTRIM) - unquote(cp); - *wbp = addword(cp, *wbp); - } else - *wbp = glob(cp, *wbp); - } - quitenv(); - } else - gflg = 1; - return(gflg == 0); -} - -/* - * Blank interpretation and quoting - */ -static char * -blank(f) -int f; -{ - register int c, c1; - register char *sp; - int scanequals, foundequals; - - sp = e.linep; - scanequals = f & DOKEY; - foundequals = 0; - -loop: - switch (c = subgetc('"', foundequals)) { - case 0: - if (sp == e.linep) - return(0); - *e.linep++ = 0; - return(sp); - - default: - if (f & DOBLANK && any(c, ifs->value)) - goto loop; - break; - - case '"': - case '\'': - scanequals = 0; - if (INSUB()) - break; - for (c1 = c; (c = subgetc(c1, 1)) != c1;) { - if (c == 0) - break; - if (c == '\'' || !any(c, "$`\"")) - c |= QUOTE; - *e.linep++ = c; - } - c = 0; - } - unget(c); - if (!isalpha(c) && c != '_') - scanequals = 0; - for (;;) { - c = subgetc('"', foundequals); - if (c == 0 || - f & (DOBLANK && any(c, ifs->value)) || - (!INSUB() && any(c, "\"'"))) { - scanequals = 0; - unget(c); - if (any(c, "\"'")) - goto loop; - break; - } - if (scanequals) { - if (c == '=') { - foundequals = 1; - scanequals = 0; - } - else if (!isalnum(c) && c != '_') - scanequals = 0; - } - *e.linep++ = c; - } - *e.linep++ = 0; - return(sp); -} - -/* - * Get characters, substituting for ` and $ - */ -static int -subgetc(ec, quoted) -register int ec; -int quoted; -{ - register char c; - -again: - c = my_getc(ec); - if (!INSUB() && ec != '\'') { - if (c == '`') { - if (grave(quoted) == 0) - return(0); - e.iop->task = XGRAVE; - goto again; - } - if (c == '$' && (c = dollar(quoted)) == 0) { - e.iop->task = XDOLL; - goto again; - } - } - return(c); -} - -/* - * Prepare to generate the string returned by ${} substitution. - */ -static int -dollar(quoted) -int quoted; -{ - int otask; - struct io *oiop; - char *dolp; - register char *s, c, *cp=NULL; - struct var *vp; - - c = readc(); - s = e.linep; - if (c != '{') { - *e.linep++ = c; - if (isalpha(c) || c == '_') { - while ((c = readc())!=0 && (isalnum(c) || c == '_')) - if (e.linep < elinep) - *e.linep++ = c; - unget(c); - } - c = 0; - } else { - oiop = e.iop; - otask = e.iop->task; - e.iop->task = XOTHER; - while ((c = subgetc('"', 0))!=0 && c!='}' && c!='\n') - if (e.linep < elinep) - *e.linep++ = c; - if (oiop == e.iop) - e.iop->task = otask; - if (c != '}') { - err("unclosed ${"); - gflg++; - return(c); - } - } - if (e.linep >= elinep) { - err("string in ${} too long"); - gflg++; - e.linep -= 10; - } - *e.linep = 0; - if (*s) - for (cp = s+1; *cp; cp++) - if (any(*cp, "=-+?")) { - c = *cp; - *cp++ = 0; - break; - } - if (s[1] == 0 && (*s == '*' || *s == '@')) { - if (dolc > 1) { - /* currently this does not distinguish $* and $@ */ - /* should check dollar */ - e.linep = s; - PUSHIO(awordlist, dolv+1, dolchar); - return(0); - } else { /* trap the nasty ${=} */ - s[0] = '1'; - s[1] = 0; - } - } - vp = lookup(s); - if ((dolp = vp->value) == null) { - switch (c) { - case '=': - if (isdigit(*s)) { - err("cannot use ${...=...} with $n"); - gflg++; - break; - } - setval(vp, cp); - dolp = vp->value; - break; - - case '-': - dolp = strsave(cp, areanum); - break; - - case '?': - if (*cp == 0) { - prs("missing value for "); - err(s); - } else - err(cp); - gflg++; - break; - } - } else if (c == '+') - dolp = strsave(cp, areanum); - if (flag['u'] && dolp == null) { - prs("unset variable: "); - err(s); - gflg++; - } - e.linep = s; - PUSHIO(aword, dolp, quoted ? qstrchar : strchar); - return(0); -} - -/* - * Run the command in `...` and read its output. - */ -static int -grave(quoted) -int quoted; -{ - register int i; - char *cp; - int pf[2]; - -#if __GNUC__ - /* Avoid longjmp clobbering */ - (void) &cp; -#endif - for (cp = e.iop->argp->aword; *cp != '`'; cp++) - if (*cp == 0) { - err("no closing `"); - return(0); - } - if (openpipe(pf) < 0) - return(0); - if ((i = vfork()) == -1) { - closepipe(pf); - err("try again"); - return(0); - } - if (i != 0) { - e.iop->argp->aword = ++cp; - close(pf[1]); - PUSHIO(afile, remap(pf[0]), quoted? qgravechar: gravechar); - return(1); - } - *cp = 0; - /* allow trapped signals */ - for (i=0; i<=_NSIG; i++) - if (ourtrap[i] && signal(i, SIG_IGN) != SIG_IGN) - signal(i, SIG_DFL); - dup2(pf[1], 1); - closepipe(pf); - flag['e'] = 0; - flag['v'] = 0; - flag['n'] = 0; - cp = strsave(e.iop->argp->aword, 0); - areanum = 1; - freehere(areanum); - freearea(areanum); /* free old space */ - e.oenv = NULL; - e.iop = (e.iobase = iostack) - 1; - unquote(cp); - interactive = 0; - PUSHIO(aword, cp, nlchar); - onecommand(); - exit(1); -} - -static char * -unquote(as) -register char *as; -{ - register char *s; - - if ((s = as) != NULL) - while (*s) - *s++ &= ~QUOTE; - return(as); -} - -/* -------- glob.c -------- */ - -/* - * glob - */ - -#define scopy(x) strsave((x), areanum) -#define BLKSIZ 512 -#define NDENT ((BLKSIZ+sizeof(struct dirent)-1)/sizeof(struct dirent)) - -static struct wdblock *cl, *nl; -static char spcl[] = "[?*"; - -static struct wdblock * -glob(cp, wb) -char *cp; -struct wdblock *wb; -{ - register int i; - register char *pp; - - if (cp == 0) - return(wb); - i = 0; - for (pp = cp; *pp; pp++) - if (any(*pp, spcl)) - i++; - else if (!any(*pp & ~QUOTE, spcl)) - *pp &= ~QUOTE; - if (i != 0) { - for (cl = addword(scopy(cp), (struct wdblock *)0); anyspcl(cl); cl = nl) { - nl = newword(cl->w_nword*2); - for(i=0; i<cl->w_nword; i++) { /* for each argument */ - for (pp = cl->w_words[i]; *pp; pp++) - if (any(*pp, spcl)) { - globname(cl->w_words[i], pp); - break; - } - if (*pp == '\0') - nl = addword(scopy(cl->w_words[i]), nl); - } - for(i=0; i<cl->w_nword; i++) - DELETE(cl->w_words[i]); - DELETE(cl); - } - for(i=0; i<cl->w_nword; i++) - unquote(cl->w_words[i]); - glob0((char *)cl->w_words, cl->w_nword, sizeof(char *), xstrcmp); - if (cl->w_nword) { - for (i=0; i<cl->w_nword; i++) - wb = addword(cl->w_words[i], wb); - DELETE(cl); - return(wb); - } - } - wb = addword(unquote(cp), wb); - return(wb); -} - -static void -globname(we, pp) -char *we; -register char *pp; -{ - register char *np, *cp; - char *name, *gp, *dp; - int k; - DIR *dirp; - struct dirent *de; - char dname[NAME_MAX+1]; - struct stat dbuf; - - for (np = we; np != pp; pp--) - if (pp[-1] == '/') - break; - for (dp = cp = space((int)(pp-np)+3); np < pp;) - *cp++ = *np++; - *cp++ = '.'; - *cp = '\0'; - for (gp = cp = space(strlen(pp)+1); *np && *np != '/';) - *cp++ = *np++; - *cp = '\0'; - dirp = opendir(dp); - if (dirp == 0) { - DELETE(dp); - DELETE(gp); - return; - } - dname[NAME_MAX] = '\0'; - while ((de=readdir(dirp))!=NULL) { - /* XXX Hmmm... What this could be? (abial) */ - /* - if (ent[j].d_ino == 0) - continue; - */ - strncpy(dname, de->d_name, NAME_MAX); - if (dname[0] == '.') - if (*gp != '.') - continue; - for(k=0; k<NAME_MAX; k++) - if (any(dname[k], spcl)) - dname[k] |= QUOTE; - if (gmatch(dname, gp)) { - name = generate(we, pp, dname, np); - if (*np && !anys(np, spcl)) { - if (stat(name,&dbuf)) { - DELETE(name); - continue; - } - } - nl = addword(name, nl); - } - } - closedir(dirp); - DELETE(dp); - DELETE(gp); -} - -/* - * generate a pathname as below. - * start..end1 / middle end - * the slashes come for free - */ -static char * -generate(start1, end1, middle, end) -char *start1; -register char *end1; -char *middle, *end; -{ - char *p; - register char *op, *xp; - - p = op = space((int)(end1-start1)+strlen(middle)+strlen(end)+2); - for (xp = start1; xp != end1;) - *op++ = *xp++; - for (xp = middle; (*op++ = *xp++) != '\0';) - ; - op--; - for (xp = end; (*op++ = *xp++) != '\0';) - ; - return(p); -} - -static int -anyspcl(wb) -register struct wdblock *wb; -{ - register int i; - register char **wd; - - wd = wb->w_words; - for (i=0; i<wb->w_nword; i++) - if (anys(spcl, *wd++)) - return(1); - return(0); -} - -static int -xstrcmp(p1, p2) -char *p1, *p2; -{ - return(strcmp(*(char **)p1, *(char **)p2)); -} - -/* -------- word.c -------- */ - -static struct wdblock * -newword(nw) -register int nw; -{ - register struct wdblock *wb; - - wb = (struct wdblock *) space(sizeof(*wb) + nw*sizeof(char *)); - wb->w_bsize = nw; - wb->w_nword = 0; - return(wb); -} - -static struct wdblock * -addword(wd, wb) -char *wd; -register struct wdblock *wb; -{ - register struct wdblock *wb2; - register int nw; - - if (wb == NULL) - wb = newword(NSTART); - if ((nw = wb->w_nword) >= wb->w_bsize) { - wb2 = newword(nw * 2); - memcpy((char *)wb2->w_words, (char *)wb->w_words, nw*sizeof(char *)); - wb2->w_nword = nw; - DELETE(wb); - wb = wb2; - } - wb->w_words[wb->w_nword++] = wd; - return(wb); -} -static -char ** -getwords(wb) -register struct wdblock *wb; -{ - register char **wd; - register int nb; - - if (wb == NULL) - return((char **)NULL); - if (wb->w_nword == 0) { - DELETE(wb); - return((char **)NULL); - } - wd = (char **) space(nb = sizeof(*wd) * wb->w_nword); - memcpy((char *)wd, (char *)wb->w_words, nb); - DELETE(wb); /* perhaps should done by caller */ - return(wd); -} - -int (*func)(char *, char *); -int globv; - -static void -glob0(a0, a1, a2, a3) -char *a0; -unsigned a1; -int a2; -int (*a3) (char *, char *); -{ - func = a3; - globv = a2; - glob1(a0, a0 + a1 * a2); -} - -static void -glob1(base, lim) -char *base, *lim; -{ - register char *i, *j; - int v2; - char *lptr, *hptr; - int c; - unsigned n; - - - v2 = globv; - -top: - if ((n=(int)(lim-base)) <= v2) - return; - n = v2 * (n / (2*v2)); - hptr = lptr = base+n; - i = base; - j = lim-v2; - for(;;) { - if (i < lptr) { - if ((c = (*func)(i, lptr)) == 0) { - glob2(i, lptr -= v2); - continue; - } - if (c < 0) { - i += v2; - continue; - } - } - -begin: - if (j > hptr) { - if ((c = (*func)(hptr, j)) == 0) { - glob2(hptr += v2, j); - goto begin; - } - if (c > 0) { - if (i == lptr) { - glob3(i, hptr += v2, j); - i = lptr += v2; - goto begin; - } - glob2(i, j); - j -= v2; - i += v2; - continue; - } - j -= v2; - goto begin; - } - - - if (i == lptr) { - if (lptr-base >= lim-hptr) { - glob1(hptr+v2, lim); - lim = lptr; - } else { - glob1(base, lptr); - base = hptr+v2; - } - goto top; - } - - - glob3(j, lptr -= v2, i); - j = hptr -= v2; - } -} - -static void -glob2(i, j) -char *i, *j; -{ - register char *index1, *index2, c; - int m; - - m = globv; - index1 = i; - index2 = j; - do { - c = *index1; - *index1++ = *index2; - *index2++ = c; - } while(--m); -} - -static void -glob3(i, j, k) -char *i, *j, *k; -{ - register char *index1, *index2, *index3; - int c; - int m; - - m = globv; - index1 = i; - index2 = j; - index3 = k; - do { - c = *index1; - *index1++ = *index3; - *index3++ = *index2; - *index2++ = c; - } while(--m); -} - -/* -------- io.c -------- */ - -/* - * shell IO - */ - -static int my_getc( int ec) -{ - register int c; - - if(e.linep > elinep) { - while((c=readc()) != '\n' && c) - ; - err("input line too long"); - gflg++; - return(c); - } - c = readc(); - if (ec != '\'' && e.iop->task != XGRAVE) { - if(c == '\\') { - c = readc(); - if (c == '\n' && ec != '\"') - return(my_getc(ec)); - c |= QUOTE; - } - } - return(c); -} - -static void -unget(c) -int c; -{ - if (e.iop >= e.iobase) - e.iop->peekc = c; -} - -static int -eofc() - -{ - return e.iop < e.iobase || (e.iop->peekc == 0 && e.iop->prev == 0); -} - -static int -readc() -{ - register int c; - - for (; e.iop >= e.iobase; e.iop--) - if ((c = e.iop->peekc) != '\0') { - e.iop->peekc = 0; - return(c); - } - else { - if (e.iop->prev != 0) { - if ((c = (*e.iop->iofn)(e.iop->argp, e.iop)) != '\0') { - if (c == -1) { - e.iop++; - continue; - } - if (e.iop == iostack) - ioecho(c); - return(e.iop->prev = c); - } - else if (e.iop->task == XIO && e.iop->prev != '\n') { - e.iop->prev = 0; - if (e.iop == iostack) - ioecho('\n'); - return '\n'; - } - } - if (e.iop->task == XIO) { - if (multiline) - return e.iop->prev = 0; - if (interactive && e.iop == iostack+1) { -#ifdef BB_FEATURE_COMMAND_EDITING - current_prompt=prompt->value; -#else - prs(prompt->value); -#endif - } - } - } - if (e.iop >= iostack) - return(0); - leave(); - /* NOTREACHED */ - return(0); -} - -static void -ioecho(c) -char c; -{ - if (flag['v']) - write(2, &c, sizeof c); -} - -static void -pushio(argp, fn) -struct ioarg *argp; -int (*fn)(); -{ - if (++e.iop >= &iostack[NPUSH]) { - e.iop--; - err("Shell input nested too deeply"); - gflg++; - return; - } - e.iop->iofn = fn; - - if (argp->afid != AFID_NOBUF) - e.iop->argp = argp; - else { - e.iop->argp = ioargstack + (e.iop - iostack); - *e.iop->argp = *argp; - e.iop->argp->afbuf = e.iop == &iostack[0] ? &mainbuf : &sharedbuf; - if (isatty(e.iop->argp->afile) == 0 && - (e.iop == &iostack[0] || - lseek(e.iop->argp->afile, 0L, 1) != -1)) { - if (++bufid == AFID_NOBUF) - bufid = AFID_ID; - e.iop->argp->afid = bufid; - } - } - - e.iop->prev = ~'\n'; - e.iop->peekc = 0; - e.iop->xchar = 0; - e.iop->nlcount = 0; - if (fn == filechar || fn == linechar) - e.iop->task = XIO; - else if (fn == gravechar || fn == qgravechar) - e.iop->task = XGRAVE; - else - e.iop->task = XOTHER; -} - -static struct io * -setbase(ip) -struct io *ip; -{ - register struct io *xp; - - xp = e.iobase; - e.iobase = ip; - return(xp); -} - -/* - * Input generating functions - */ - -/* - * Produce the characters of a string, then a newline, then EOF. - */ -static int -nlchar(ap) -register struct ioarg *ap; -{ - register int c; - - if (ap->aword == NULL) - return(0); - if ((c = *ap->aword++) == 0) { - ap->aword = NULL; - return('\n'); - } - return(c); -} - -/* - * Given a list of words, produce the characters - * in them, with a space after each word. - */ -static int -wdchar(ap) -register struct ioarg *ap; -{ - register char c; - register char **wl; - - if ((wl = ap->awordlist) == NULL) - return(0); - if (*wl != NULL) { - if ((c = *(*wl)++) != 0) - return(c & 0177); - ap->awordlist++; - return(' '); - } - ap->awordlist = NULL; - return('\n'); -} - -/* - * Return the characters of a list of words, - * producing a space between them. - */ -static int -dolchar(ap) -register struct ioarg *ap; -{ - register char *wp; - - if ((wp = *ap->awordlist++) != NULL) { - PUSHIO(aword, wp, *ap->awordlist == NULL? strchar: xxchar); - return(-1); - } - return(0); -} - -static int -xxchar(ap) -register struct ioarg *ap; -{ - register int c; - - if (ap->aword == NULL) - return(0); - if ((c = *ap->aword++) == '\0') { - ap->aword = NULL; - return(' '); - } - return(c); -} - -/* - * Produce the characters from a single word (string). - */ -static int -strchar(ap) -register struct ioarg *ap; -{ - register int c; - - if (ap->aword == NULL || (c = *ap->aword++) == 0) - return(0); - return(c); -} - -/* - * Produce quoted characters from a single word (string). - */ -static int -qstrchar(ap) -register struct ioarg *ap; -{ - register int c; - - if (ap->aword == NULL || (c = *ap->aword++) == 0) - return(0); - return(c|QUOTE); -} - -/* - * Return the characters from a file. - */ -static int -filechar(ap) -register struct ioarg *ap; -{ - register int i; - char c; - struct iobuf *bp = ap->afbuf; - - if (ap->afid != AFID_NOBUF) { - if ((i = ap->afid != bp->id) || bp->bufp == bp->ebufp) { - if (i) - lseek(ap->afile, ap->afpos, 0); - i = safe_read(ap->afile, bp->buf, sizeof(bp->buf)); - if (i <= 0) { - closef(ap->afile); - return 0; - } - bp->id = ap->afid; - bp->ebufp = (bp->bufp = bp->buf) + i; - } - ap->afpos++; - return *bp->bufp++ & 0177; - } - -#ifdef BB_FEATURE_COMMAND_EDITING - if (interactive) { - static char mycommand[BUFSIZ]; - static int position = 0, size = 0; - - while (size == 0 || position >= size) { - cmdedit_read_input(current_prompt, mycommand); - size = strlen(mycommand); - position = 0; - } - c = mycommand[position]; - position++; - return(c); - } else -#endif - { - i = safe_read(ap->afile, &c, sizeof(c)); - return(i == sizeof(c)? c&0177: (closef(ap->afile), 0)); - } -} - -/* - * Return the characters from a here temp file. - */ -static int -herechar(ap) -register struct ioarg *ap; -{ - char c; - - - if (read(ap->afile, &c, sizeof(c)) != sizeof(c)) { - close(ap->afile); - c = 0; - } - return (c); - -} - -/* - * Return the characters produced by a process (`...`). - * Quote them if required, and remove any trailing newline characters. - */ -static int -gravechar(ap, iop) -struct ioarg *ap; -struct io *iop; -{ - register int c; - - if ((c = qgravechar(ap, iop)&~QUOTE) == '\n') - c = ' '; - return(c); -} - -static int -qgravechar(ap, iop) -register struct ioarg *ap; -struct io *iop; -{ - register int c; - - if (iop->xchar) { - if (iop->nlcount) { - iop->nlcount--; - return('\n'|QUOTE); - } - c = iop->xchar; - iop->xchar = 0; - } else if ((c = filechar(ap)) == '\n') { - iop->nlcount = 1; - while ((c = filechar(ap)) == '\n') - iop->nlcount++; - iop->xchar = c; - if (c == 0) - return(c); - iop->nlcount--; - c = '\n'; - } - return(c!=0? c|QUOTE: 0); -} - -/* - * Return a single command (usually the first line) from a file. - */ -static int -linechar(ap) -register struct ioarg *ap; -{ - register int c; - - if ((c = filechar(ap)) == '\n') { - if (!multiline) { - closef(ap->afile); - ap->afile = -1; /* illegal value */ - } - } - return(c); -} - -static void -prs(s) -register char *s; -{ - if (*s) - write(2, s, strlen(s)); -} - -static void -prn(u) -unsigned u; -{ - prs(itoa(u, 0)); -} - -static void -closef(i) -register int i; -{ - if (i > 2) - close(i); -} - -static void -closeall() -{ - register int u; - - for (u=NUFILE; u<NOFILE;) - close(u++); -} - -/* - * remap fd into Shell's fd space - */ -static int -remap(fd) -register int fd; -{ - register int i; - int map[NOFILE]; - - if (fd < e.iofd) { - for (i=0; i<NOFILE; i++) - map[i] = 0; - do { - map[fd] = 1; - fd = dup(fd); - } while (fd >= 0 && fd < e.iofd); - for (i=0; i<NOFILE; i++) - if (map[i]) - close(i); - if (fd < 0) - err("too many files open in shell"); - } - return(fd); -} - -static int -openpipe(pv) -register int *pv; -{ - register int i; - - if ((i = pipe(pv)) < 0) - err("can't create pipe - try again"); - return(i); -} - -static void -closepipe(pv) -register int *pv; -{ - if (pv != NULL) { - close(*pv++); - close(*pv); - } -} - -/* -------- here.c -------- */ - -/* - * here documents - */ - -static void -markhere(s, iop) -register char *s; -struct ioword *iop; -{ - register struct here *h, *lh; - - h = (struct here *) space(sizeof(struct here)); - if (h == 0) - return; - h->h_tag = evalstr(s, DOSUB); - if (h->h_tag == 0) - return; - h->h_iop = iop; - iop->io_name = 0; - h->h_next = NULL; - if (inhere == 0) - inhere = h; - else - for (lh = inhere; lh!=NULL; lh = lh->h_next) - if (lh->h_next == 0) { - lh->h_next = h; - break; - } - iop->io_flag |= IOHERE|IOXHERE; - for (s = h->h_tag; *s; s++) - if (*s & QUOTE) { - iop->io_flag &= ~ IOXHERE; - *s &= ~ QUOTE; - } - h->h_dosub = iop->io_flag & IOXHERE; -} - -static void -gethere() -{ - register struct here *h, *hp; - - /* Scan here files first leaving inhere list in place */ - for (hp = h = inhere; h != NULL; hp = h, h = h->h_next) - readhere(&h->h_iop->io_name, h->h_tag, h->h_dosub? 0: '\''); - - /* Make inhere list active - keep list intact for scraphere */ - if (hp != NULL) { - hp->h_next = acthere; - acthere = inhere; - inhere = NULL; - } -} - -static void -readhere(name, s, ec) -char **name; -register char *s; -int ec; -{ - int tf; - char tname[30] = ".msh_XXXXXX"; - register int c; - jmp_buf ev; - char myline [LINELIM+1]; - char *thenext; - - tf = mkstemp(tname); - if (tf < 0) - return; - *name = strsave(tname, areanum); - if (newenv(setjmp(errpt = ev)) != 0) - unlink(tname); - else { - pushio(e.iop->argp, e.iop->iofn); - e.iobase = e.iop; - for (;;) { - if (interactive && e.iop <= iostack) { -#ifdef BB_FEATURE_COMMAND_EDITING - current_prompt=cprompt->value; -#else - prs(cprompt->value); -#endif - } - thenext = myline; - while ((c = my_getc(ec)) != '\n' && c) { - if (ec == '\'') - c &= ~ QUOTE; - if (thenext >= &myline[LINELIM]) { - c = 0; - break; - } - *thenext++ = c; - } - *thenext = 0; - if (strcmp(s, myline) == 0 || c == 0) - break; - *thenext++ = '\n'; - write (tf, myline, (int)(thenext-myline)); - } - if (c == 0) { - prs("here document `"); prs(s); err("' unclosed"); - } - quitenv(); - } - close(tf); -} - -/* - * open here temp file. - * if unquoted here, expand here temp file into second temp file. - */ -static int -herein(hname, xdoll) -char *hname; -int xdoll; -{ - register int hf; - int tf; - -#if __GNUC__ - /* Avoid longjmp clobbering */ - (void) &tf; -#endif - if (hname == 0) - return(-1); - hf = open(hname, 0); - if (hf < 0) - return (-1); - if (xdoll) { - char c; - char tname[30] = ".msh_XXXXXX"; - jmp_buf ev; - - tf = mkstemp(tname); - if (tf < 0) - return (-1); - if (newenv(setjmp(errpt = ev)) == 0) { - PUSHIO(afile, hf, herechar); - setbase(e.iop); - while ((c = subgetc(0, 0)) != 0) { - c &= ~ QUOTE; - write(tf, &c, sizeof c); - } - quitenv(); - } else - unlink(tname); - close(tf); - tf = open(tname, 0); - unlink(tname); - return (tf); - } else - return (hf); -} - -static void -scraphere() -{ - register struct here *h; - - for (h = inhere; h != NULL; h = h->h_next) { - if (h->h_iop && h->h_iop->io_name) - unlink(h->h_iop->io_name); - } - inhere = NULL; -} - -/* unlink here temp files before a freearea(area) */ -static void -freehere(area) -int area; -{ - register struct here *h, *hl; - - hl = NULL; - for (h = acthere; h != NULL; h = h->h_next) - if (getarea((char *) h) >= area) { - if (h->h_iop->io_name != NULL) - unlink(h->h_iop->io_name); - if (hl == NULL) - acthere = h->h_next; - else - hl->h_next = h->h_next; - } else - hl = h; -} - - - -/* - * Copyright (c) 1987,1997, Prentice Hall - * All rights reserved. - * - * Redistribution and use of the MINIX operating system in source and - * binary forms, with or without modification, are permitted provided - * that the following conditions are met: - * - * Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * - * Redistributions in binary form must reproduce the above - * copyright notice, this list of conditions and the following - * disclaimer in the documentation and/or other materials provided - * with the distribution. - * - * Neither the name of Prentice Hall nor the names of the software - * authors or contributors may be used to endorse or promote - * products derived from this software without specific prior - * written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS, AUTHORS, AND - * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, - * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF - * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. - * IN NO EVENT SHALL PRENTICE HALL OR ANY AUTHORS OR CONTRIBUTORS BE - * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR - * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF - * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR - * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, - * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE - * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, - * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - * - */ - |