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hush/shell/msh.c
Eric Andersen 1c31501b1b Ensure that getenv("PATH") stays current, since otherwise cmdedit 
(which calls getenv("PATH")) would not operate upon the current
PATH settings, which was really quite iritating.
 -Erik
2002-04-26 23:40:09 +00:00

4873 lines
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/* 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 CONFIG_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 CONFIG_FEATURE_SH_FANCY_PROMPT
if (prompt->value == null)
#endif
setval(prompt, "$ ");
if (geteuid() == 0) {
setval(prompt, "# ");
prompt->status &= ~EXPORT;
}
cprompt = lookup("PS2");
#ifdef CONFIG_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 CONFIG_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 CONFIG_FEATURE_COMMAND_EDITING
current_prompt=prompt->value;
#else
prs(prompt->value);
#endif
}
onecommand();
/* Ensure that getenv("PATH") stays current */
setenv("PATH", path->value, 1);
}
}
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 '$':
*e.linep++ = c;
if ((c = my_getc(0)) == '{') {
if ((c = collect(c, '}')) != '\0')
return(c);
goto pack;
}
break;
case '`':
case '\'':
case '"':
if ((c = collect(c, c)) != '\0')
return(c);
goto pack;
case '|':
case '&':
case ';':
if ((c1 = dual(c)) != '\0') {
startl = 1;
return(c1);
}
startl = 1;
return(c);
case '^':
startl = 1;
return('|');
case '>':
case '<':
diag(c);
return(c);
case '\n':
nlseen++;
gethere();
startl = 1;
if (multiline || cf & CONTIN) {
if (interactive && e.iop <= iostack) {
#ifdef CONFIG_FEATURE_COMMAND_EDITING
current_prompt=cprompt->value;
#else
prs(cprompt->value);
#endif
}
if (cf & CONTIN)
goto loop;
}
return(c);
case '(':
case ')':
startl = 1;
return(c);
}
unget(c);
pack:
while ((c = my_getc(0)) != 0 && !any(c, "`$ '\"\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 CONFIG_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) &wp;
#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) &wp;
(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 CONFIG_FEATURE_SH_STANDALONE_SHELL
char *name = c;
#ifdef CONFIG_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 CONFIG_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 -------- */
/*
* ${}
* `command`
* blank interpretation
* quoting
* glob
*/
static char ** eval( char **ap, int f)
{
struct wdblock *wb;
char **wp;
char **wf;
jmp_buf ev;
#if __GNUC__
/* Avoid longjmp clobbering */
(void) &wp;
(void) &ap;
#endif
wp = NULL;
wb = NULL;
wf = NULL;
if (newenv(setjmp(errpt = ev)) == 0) {
while (*ap && isassign(*ap))
expand(*ap++, &wb, f & ~DOGLOB);
if (flag['k']) {
for (wf = ap; *wf; wf++) {
if (isassign(*wf))
expand(*wf, &wb, f & ~DOGLOB);
}
}
for (wb = addword((char *)0, wb); *ap; ap++) {
if (!flag['k'] || !isassign(*ap))
expand(*ap, &wb, f & ~DOKEY);
}
wb = addword((char *)0, wb);
wp = getwords(wb);
quitenv();
} else
gflg = 1;
return(gflg? (char **)NULL: wp);
}
/*
* Make the exported environment from the exported
* names in the dictionary. Keyword assignments
* will already have been done.
*/
static char **
makenv()
{
register struct wdblock *wb;
register struct var *vp;
wb = NULL;
for (vp = vlist; vp; vp = vp->next)
if (vp->status & EXPORT)
wb = addword(vp->name, wb);
wb = addword((char *)0, wb);
return(getwords(wb));
}
static char *
evalstr(cp, f)
register char *cp;
int f;
{
struct wdblock *wb;
wb = NULL;
if (expand(cp, &wb, f)) {
if (wb == NULL || wb->w_nword == 0 || (cp = wb->w_words[0]) == NULL)
cp = "";
DELETE(wb);
} else
cp = NULL;
return(cp);
}
static int
expand( char *cp, register struct wdblock **wbp, int f)
{
jmp_buf ev;
#if __GNUC__
/* Avoid longjmp clobbering */
(void) &cp;
#endif
gflg = 0;
if (cp == NULL)
return(0);
if (!anys("$`'\"", 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 CONFIG_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 CONFIG_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 CONFIG_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.
*
*/
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