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busybox/shell/msh.c
Denis Vlasenko 1e3b068689 msh: cleaning up for -Wwrite-strings part #4
2007-02-01 01:43:54 +00:00

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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 <andersen@codepoet.org>
*
* - backtick expansion did not work properly
* Jonas Holmberg <jonas.holmberg@axis.com>
* Robert Schwebel <r.schwebel@pengutronix.de>
* Erik Andersen <andersen@codepoet.org>
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include <setjmp.h>
#include <sys/times.h>
#include "busybox.h"
extern char **environ;
/*#define MSHDEBUG 1*/
#ifdef MSHDEBUG
int mshdbg = MSHDEBUG;
#define DBGPRINTF(x) if(mshdbg>0)printf x
#define DBGPRINTF0(x) if(mshdbg>0)printf x
#define DBGPRINTF1(x) if(mshdbg>1)printf x
#define DBGPRINTF2(x) if(mshdbg>2)printf x
#define DBGPRINTF3(x) if(mshdbg>3)printf x
#define DBGPRINTF4(x) if(mshdbg>4)printf x
#define DBGPRINTF5(x) if(mshdbg>5)printf x
#define DBGPRINTF6(x) if(mshdbg>6)printf x
#define DBGPRINTF7(x) if(mshdbg>7)printf x
#define DBGPRINTF8(x) if(mshdbg>8)printf x
#define DBGPRINTF9(x) if(mshdbg>9)printf x
int mshdbg_rc = 0;
#define RCPRINTF(x) if(mshdbg_rc)printf x
#else
#define DBGPRINTF(x)
#define DBGPRINTF0(x) ((void)0)
#define DBGPRINTF1(x) ((void)0)
#define DBGPRINTF2(x) ((void)0)
#define DBGPRINTF3(x) ((void)0)
#define DBGPRINTF4(x) ((void)0)
#define DBGPRINTF5(x) ((void)0)
#define DBGPRINTF6(x) ((void)0)
#define DBGPRINTF7(x) ((void)0)
#define DBGPRINTF8(x) ((void)0)
#define DBGPRINTF9(x) ((void)0)
#define RCPRINTF(x) ((void)0)
#endif /* MSHDEBUG */
#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
# define DEFAULT_ROOT_PROMPT "\\u:\\w> "
# define DEFAULT_USER_PROMPT "\\u:\\w$ "
#else
# define DEFAULT_ROOT_PROMPT "# "
# define DEFAULT_USER_PROMPT "$ "
#endif
/* -------- sh.h -------- */
/*
* shell
*/
#define LINELIM 2100
#define NPUSH 8 /* limit to input nesting */
#undef NOFILE
#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 definitions
*/
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)
/*
* 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 */
/*
* 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 & */
/* Added to support "." file expansion */
#define TDOT 17
/* Strings for names to make debug easier */
#ifdef MSHDEBUG
static const char *const T_CMD_NAMES[] = {
"PLACEHOLDER",
"TCOM",
"TPAREN",
"TPIPE",
"TLIST",
"TOR",
"TAND",
"TFOR",
"TDO",
"TCASE",
"TIF",
"TWHILE",
"TUNTIL",
"TELIF",
"TPAT",
"TBRACE",
"TASYNC",
"TDOT",
};
#endif
/*
* actions determining the environment of a process
*/
#define BIT(i) (1<<(i))
#define FEXEC BIT(0) /* execute without forking */
#define AREASIZE (90000)
/*
* 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)
/* PROTOTYPES */
static int newfile(char *s);
struct brkcon {
jmp_buf brkpt;
struct brkcon *nextlev;
};
/*
* 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 flags['z' - 'a' + 1];
/* this looks weird, but is OK ... we index flag with 'a'...'z' */
static char *flag = flags - 'a';
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;
#if ENABLE_FEATURE_EDITING
static char *current_prompt;
static line_input_t *line_input_state;
#endif
static int areanum; /* current allocation area */
/*
* other functions
*/
static const char *rexecve(char *c, char **v, char **envp);
static char *evalstr(char *cp, int f);
static char *putn(int n);
static char *unquote(char *as);
static int rlookup(char *n);
static struct wdblock *glob(char *cp, struct wdblock *wb);
static int my_getc(int ec);
static int subgetc(char ec, int quoted);
static char **makenv(int all, struct wdblock *wb);
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 next(int f);
static void setdash(void);
static void onecommand(void);
static void runtrap(int i);
/* -------- 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
/* Added for "." file expansion */
#define DOT 273
#define YYERRCODE 300
/* flags to yylex */
#define CONTIN 01 /* skip new lines to complete command */
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 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 int yyparse(void);
static int execute(struct op *t, int *pin, int *pout, int act);
#define AFID_NOBUF (~0)
#define AFID_ID 0
/* -------- 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 {
const char *aword;
char **awordlist;
int afile; /* file descriptor */
unsigned afid; /* buffer id */
long afpos; /* file position */
struct iobuf *afbuf; /* buffer for this file */
};
/* an input generator's state */
struct io {
int (*iofn) (struct ioarg *, struct io *);
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 */
};
#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)
static struct ioarg temparg = { 0, 0, 0, AFID_NOBUF, 0 }; /* temporary for PUSHIO */
static struct ioarg ioargstack[NPUSH];
static struct io iostack[NPUSH];
static struct iobuf sharedbuf = { AFID_NOBUF };
static struct iobuf mainbuf = { AFID_NOBUF };
static unsigned bufid = AFID_ID; /* buffer id counter */
#define PUSHIO(what,arg,gen) ((temparg.what = (arg)), pushio(&temparg,(gen)))
#define RUN(what,arg,gen) ((temparg.what = (arg)), run(&temparg,(gen)))
/*
* parsing & execution environment
*/
static struct env {
char *linep;
struct io *iobase;
struct io *iop;
xint *errpt; /* void * */
int iofd;
struct env *oenv;
} e;
/*
* 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) (struct ioarg *));
static int eofc(void);
static int readc(void);
static void unget(int c);
static void ioecho(char c);
/*
* IO control
*/
static void pushio(struct ioarg *argp, int (*f) (struct ioarg *));
static int remap(int fd);
static int openpipe(int *pv);
static void closepipe(int *pv);
static struct io *setbase(struct io *ip);
/* -------- 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);
/* -------- misc stuff -------- */
static int forkexec(struct op *t, int *pin, int *pout, int act, char **wp);
static int iosetup(struct ioword *iop, int pipein, int pipeout);
static void brkset(struct brkcon *bc);
static int dolabel(struct op *t);
static int dohelp(struct op *t);
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, sighandler_t 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) (struct var *), int key);
static void badid(char *s);
static int doset(struct op *t);
static void varput(char *s, int out);
static int dotimes(struct op *t);
static int expand(const 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 a1, int a2,
int (*a3) (char *, char *));
static void readhere(char **name, char *s, int ec);
static void pushio(struct ioarg *argp, int (*f) (struct ioarg *));
static int xxchar(struct ioarg *ap);
struct here {
char *h_tag;
int h_dosub;
struct ioword *h_iop;
struct here *h_next;
};
static const char * const signame[] = {
"Signal 0",
"Hangup",
NULL, /* interrupt */
"Quit",
"Illegal instruction",
"Trace/BPT trap",
"Abort",
"Bus error",
"Floating Point Exception",
"Killed",
"SIGUSR1",
"SIGSEGV",
"SIGUSR2",
NULL, /* broken pipe */
"Alarm clock",
"Terminated",
};
#define NSIGNAL (sizeof(signame)/sizeof(signame[0]))
struct res {
const char *r_name;
int r_val;
};
static const 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},
{"{", '{'},
{"}", '}'},
{".", DOT},
{0, 0},
};
struct builtincmd {
const char *name;
int (*builtinfunc) (struct op * t);
};
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}
};
static struct op *scantree(struct op *);
static struct op *dowholefile(int, int);
/* Globals */
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 */
#ifdef MSHDEBUG
static struct var *mshdbg_var;
#endif
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 areanum; /* current allocation area */
static int intr;
static int inparse;
static char *null = (char*)"";
static int heedint = 1;
static void (*qflag) (int) = SIG_IGN;
static int startl;
static int peeksym;
static int nlseen;
static int iounit = IODEFAULT;
static YYSTYPE yylval;
static char *elinep = line + sizeof(line) - 5;
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;
static struct env e = {
line, /* linep: char ptr */
iostack, /* iobase: struct io ptr */
iostack - 1, /* iop: struct io ptr */
(xint *) NULL, /* errpt: void ptr for errors? */
FDBASE, /* iofd: file desc */
(struct env *) NULL /* oenv: struct env ptr */
};
#ifdef MSHDEBUG
void print_t(struct op *t)
{
DBGPRINTF(("T: t=%p, type %s, words=%p, IOword=%p\n", t,
T_CMD_NAMES[t->type], t->words, t->ioact));
if (t->words) {
DBGPRINTF(("T: W1: %s", t->words[0]));
}
}
void print_tree(struct op *head)
{
if (head == NULL) {
DBGPRINTF(("PRINT_TREE: no tree\n"));
return;
}
DBGPRINTF(("NODE: %p, left %p, right %p\n", head, head->left,
head->right));
if (head->left)
print_tree(head->left);
if (head->right)
print_tree(head->right);
}
#endif /* MSHDEBUG */
/*
* IO functions
*/
static void prs(const char *s)
{
if (*s)
write(2, s, strlen(s));
}
static void prn(unsigned u)
{
prs(itoa(u));
}
static void echo(char **wp)
{
int i;
prs("+");
for (i = 0; wp[i]; i++) {
if (i)
prs(" ");
prs(wp[i]);
}
prs("\n");
}
static void closef(int i)
{
if (i > 2)
close(i);
}
static void closeall(void)
{
int u;
for (u = NUFILE; u < NOFILE;)
close(u++);
}
/* fail but return to process next command */
static void fail(void) ATTRIBUTE_NORETURN;
static void fail(void)
{
longjmp(failpt, 1);
/* NOTREACHED */
}
/* abort shell (or fail in subshell) */
static void leave(void) ATTRIBUTE_NORETURN;
static void leave(void)
{
DBGPRINTF(("LEAVE: leave called!\n"));
if (execflg)
fail();
scraphere();
freehere(1);
runtrap(0);
_exit(exstat);
/* NOTREACHED */
}
static void warn(const char *s)
{
if (*s) {
prs(s);
exstat = -1;
}
prs("\n");
if (flag['e'])
leave();
}
static void err(const char *s)
{
warn(s);
if (flag['n'])
return;
if (!interactive)
leave();
if (e.errpt)
longjmp(e.errpt, 1);
closeall();
e.iop = e.iobase = iostack;
}
/* -------- 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(void)
{
brkaddr = xmalloc(AREASIZE);
brktop = brkaddr + AREASIZE;
while ((long) sbrk(0) & ALIGN)
sbrk(1);
areabot = (struct region *) sbrk(REGSIZE);
areabot->next = areabot;
areabot->area = BUSY;
areatop = areabot;
areanxt = areabot;
}
static char *getcell(unsigned nbytes)
{
int nregio;
struct region *p, *q;
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;
p = areanxt;
for (;;) {
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 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(char *cp)
{
struct region *p;
p = (struct region *) cp;
if (p != NULL) {
p--;
if (p < areanxt)
areanxt = p;
p->area = FREE;
}
}
#define DELETE(obj) freecell((char *)obj)
static void freearea(int a)
{
struct region *p, *top;
top = areatop;
for (p = areabot; p != top; p = p->next)
if (p->area >= a)
p->area = FREE;
}
static void setarea(char *cp, int a)
{
struct region *p;
p = (struct region *) cp;
if (p != NULL)
(p - 1)->area = a;
}
static int getarea(char *cp)
{
return ((struct region *) cp - 1)->area;
}
static void garbage(void)
{
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
}
static char *space(int n)
{
char *cp;
cp = getcell(n);
if (cp == NULL)
err("out of string space");
return cp;
}
static char *strsave(const char *s, int a)
{
char *cp;
cp = space(strlen(s) + 1);
if (cp == NULL) {
// FIXME: I highly doubt this is good.
return (char*)"";
}
setarea(cp, a);
strcpy(cp, s);
return cp;
}
/* -------- var.c -------- */
static int eqname(const char *n1, const char *n2)
{
for (; *n1 != '=' && *n1 != '\0'; n1++)
if (*n2++ != *n1)
return 0;
return *n2 == '\0' || *n2 == '=';
}
static const char *findeq(const char *cp)
{
while (*cp != '\0' && *cp != '=')
cp++;
return cp;
}
/*
* 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(const char *n)
{
// FIXME: dirty hack
static struct var dummy;
struct var *vp;
const char *cp;
char *xp;
int c;
if (isdigit(*n)) {
dummy.name = (char*)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 = (char*)"";
return &dummy;
}
xp = vp->name;
while ((*xp = *n++) != '\0' && *xp != '=')
xp++;
*xp++ = '=';
*xp = '\0';
setarea((char *) vp, 0);
setarea((char *) vp->name, 0);
vp->value = null;
vp->next = vlist;
vp->status = GETCELL;
vlist = vp;
return vp;
}
/*
* 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(struct var *vp, const char *val, const char *name)
{
const char *cp;
char *xp;
int fl;
if (vp->status & RONLY) {
xp = vp->name;
while (*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 == NULL)
return;
/* make string: name=value */
setarea(xp, 0);
name = xp;
cp = vp->name;
while ((*xp = *cp++) != '\0' && *xp != '=')
xp++;
*xp++ = '=';
strcpy(xp, val);
val = xp;
fl = GETCELL;
}
if (vp->status & GETCELL)
freecell(vp->name); /* form new string `name=value' */
vp->name = (char*)name;
vp->value = (char*)val;
vp->status |= fl;
}
/*
* give variable at `vp' the value `val'.
*/
static void setval(struct var *vp, const char *val)
{
nameval(vp, val, NULL);
}
static void export(struct var *vp)
{
vp->status |= EXPORT;
}
static void ronly(struct var *vp)
{
if (isalpha(vp->name[0]) || vp->name[0] == '_') /* not an internal symbol */
vp->status |= RONLY;
}
static int isassign(const char *s)
{
unsigned char c;
DBGPRINTF7(("ISASSIGN: enter, s=%s\n", s));
/* no isalpha() - we shouldn't use locale */
c = *s;
if (c != '_'
&& (unsigned)((c|0x20) - 'a') > 25 /* not letter */
) {
return 0;
}
while (1) {
c = *++s;
if (c == '\0')
return 0;
if (c == '=')
return 1;
c |= 0x20; /* lowercase letters, doesn't affect numbers */
if (c != '_'
&& (unsigned)(c - '0') > 9 /* not number */
&& (unsigned)(c - 'a') > 25 /* not letter */
) {
return 0;
}
}
}
static int assign(const char *s, int cf)
{
const char *cp;
struct var *vp;
DBGPRINTF7(("ASSIGN: enter, s=%s, cf=%d\n", s, cf));
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 ? NULL : s);
if (cf != COPYV)
vp->status &= ~GETCELL;
return 1;
}
static int checkname(char *cp)
{
DBGPRINTF7(("CHECKNAME: enter, cp=%s\n", cp));
if (!isalpha(*cp++) && *(cp - 1) != '_')
return 0;
while (*cp)
if (!isalnum(*cp++) && *(cp - 1) != '_')
return 0;
return 1;
}
static void putvlist(int f, int out)
{
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);
}
}
}
/*
* trap handling
*/
static void sig(int i)
{
trapset = i;
signal(i, sig);
}
static void runtrap(int i)
{
char *trapstr;
trapstr = trap[i];
if (trapstr == NULL)
return;
if (i == 0)
trap[i] = NULL;
RUN(aword, trapstr, nlchar);
}
static void setdash(void)
{
char *cp;
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(char *s)
{
int f;
DBGPRINTF7(("NEWFILE: opening %s\n", s));
f = 0;
if (NOT_LONE_DASH(s)) {
DBGPRINTF(("NEWFILE: s is %s\n", s));
f = open(s, 0);
if (f < 0) {
prs(s);
err(": cannot open");
return 1;
}
}
next(remap(f));
return 0;
}
struct op *scantree(struct op *head)
{
struct op *dotnode;
if (head == NULL)
return NULL;
if (head->left != NULL) {
dotnode = scantree(head->left);
if (dotnode)
return dotnode;
}
if (head->right != NULL) {
dotnode = scantree(head->right);
if (dotnode)
return dotnode;
}
if (head->words == NULL)
return NULL;
DBGPRINTF5(("SCANTREE: checking node %p\n", head));
if ((head->type != TDOT) && (strcmp(".", head->words[0]) == 0)) {
DBGPRINTF5(("SCANTREE: dot found in node %p\n", head));
return head;
}
return NULL;
}
static void onecommand(void)
{
int i;
jmp_buf m1;
DBGPRINTF(("ONECOMMAND: enter, outtree=%p\n", outtree));
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;
failpt = m1;
setjmp(failpt); /* Bruce Evans' fix */
failpt = m1;
if (setjmp(failpt) || yyparse() || intr) {
DBGPRINTF(("ONECOMMAND: this is not good.\n"));
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']) {
DBGPRINTF(("ONECOMMAND: calling execute, t=outtree=%p\n",
outtree));
execute(outtree, NOPIPE, NOPIPE, 0);
}
if (!interactive && intr) {
execflg = 0;
leave();
}
i = trapset;
if (i != 0) {
trapset = 0;
runtrap(i);
}
}
static int newenv(int f)
{
struct env *ep;
DBGPRINTF(("NEWENV: f=%d (indicates quitenv and return)\n", f));
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(void)
{
struct env *ep;
int fd;
DBGPRINTF(("QUITENV: e.oenv=%p\n", e.oenv));
ep = e.oenv;
if (ep != NULL) {
fd = e.iofd;
e = *ep;
/* should close `'d files */
DELETE(ep);
while (--fd >= e.iofd)
close(fd);
}
}
/*
* Is character c in s?
*/
static int any(int c, const char *s)
{
while (*s)
if (*s++ == c)
return 1;
return 0;
}
/*
* Is any character from s1 in s2?
*/
static int anys(const char *s1, const char *s2)
{
while (*s1)
if (any(*s1++, s2))
return 1;
return 0;
}
static char *putn(int n)
{
return itoa(n);
}
static void next(int f)
{
PUSHIO(afile, f, filechar);
}
static void onintr(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();
}
}
/* -------- 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 const char *cclass(const char *p, int sub)
{
int c, d, not, found;
not = (*p == NOT);
if (not != 0)
p++;
found = not;
do {
if (*p == '\0')
return 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 : NULL;
}
static int gmatch(const char *s, const char *p)
{
int sc, pc;
if (s == NULL || p == NULL)
return 0;
while ((pc = *p++ & CMASK) != '\0') {
sc = *s++ & QMASK;
switch (pc) {
case '[':
p = cclass(p, sc);
if (p == 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';
}
/* -------- csyn.c -------- */
/*
* shell: syntax (C version)
*/
static void yyerror(const char *s) ATTRIBUTE_NORETURN;
static void yyerror(const char *s)
{
yynerrs++;
if (interactive && e.iop <= iostack) {
multiline = 0;
while (eofc() == 0 && yylex(0) != '\n');
}
err(s);
fail();
}
static void zzerr(void) ATTRIBUTE_NORETURN;
static void zzerr(void)
{
yyerror("syntax error");
}
int yyparse(void)
{
DBGPRINTF7(("YYPARSE: enter...\n"));
startl = 1;
peeksym = 0;
yynerrs = 0;
outtree = c_list();
musthave('\n', 0);
return (yynerrs != 0);
}
static struct op *pipeline(int cf)
{
struct op *t, *p;
int c;
DBGPRINTF7(("PIPELINE: enter, cf=%d\n", cf));
t = command(cf);
DBGPRINTF9(("PIPELINE: t=%p\n", t));
if (t != NULL) {
while ((c = yylex(0)) == '|') {
p = command(CONTIN);
if (p == NULL) {
DBGPRINTF8(("PIPELINE: error!\n"));
zzerr();
}
if (t->type != TPAREN && t->type != TCOM) {
/* shell statement */
t = block(TPAREN, t, NOBLOCK, NOWORDS);
}
t = block(TPIPE, t, p, NOWORDS);
}
peeksym = c;
}
DBGPRINTF7(("PIPELINE: returning t=%p\n", t));
return t;
}
static struct op *andor(void)
{
struct op *t, *p;
int c;
DBGPRINTF7(("ANDOR: enter...\n"));
t = pipeline(0);
DBGPRINTF9(("ANDOR: t=%p\n", t));
if (t != NULL) {
while ((c = yylex(0)) == LOGAND || c == LOGOR) {
p = pipeline(CONTIN);
if (p == NULL) {
DBGPRINTF8(("ANDOR: error!\n"));
zzerr();
}
t = block(c == LOGAND ? TAND : TOR, t, p, NOWORDS);
} /* WHILE */
peeksym = c;
}
DBGPRINTF7(("ANDOR: returning t=%p\n", t));
return t;
}
static struct op *c_list(void)
{
struct op *t, *p;
int c;
DBGPRINTF7(("C_LIST: enter...\n"));
t = andor();
if (t != NULL) {
peeksym = yylex(0);
if (peeksym == '&')
t = block(TASYNC, t, NOBLOCK, NOWORDS);
while ((c = yylex(0)) == ';' || c == '&'
|| (multiline && c == '\n')) {
p = andor();
if (p== NULL)
return t;
peeksym = yylex(0);
if (peeksym == '&')
p = block(TASYNC, p, NOBLOCK, NOWORDS);
t = list(t, p);
} /* WHILE */
peeksym = c;
}
/* IF */
DBGPRINTF7(("C_LIST: returning t=%p\n", t));
return t;
}
static int synio(int cf)
{
struct ioword *iop;
int i;
int c;
DBGPRINTF7(("SYNIO: enter, cf=%d\n", cf));
c = yylex(cf);
if (c != '<' && 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);
DBGPRINTF7(("SYNIO: returning 1\n"));
return 1;
}
static void musthave(int c, int cf)
{
peeksym = yylex(cf);
if (peeksym != c) {
DBGPRINTF7(("MUSTHAVE: error!\n"));
zzerr();
}
peeksym = 0;
}
static struct op *simple(void)
{
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(int type, int mark)
{
struct op *t;
DBGPRINTF3(("NESTED: enter, type=%d, mark=%d\n", type, mark));
multiline++;
t = c_list();
musthave(mark, 0);
multiline--;
return block(type, t, NOBLOCK, NOWORDS);
}
static struct op *command(int cf)
{
struct op *t;
struct wdblock *iosave;
int c;
DBGPRINTF(("COMMAND: enter, cf=%d\n", cf));
iosave = iolist;
iolist = NULL;
if (multiline)
cf |= CONTIN;
while (synio(cf))
cf = 0;
c = yylex(cf);
switch (c) {
default:
peeksym = c;
t = simple();
if (t == NULL) {
if (iolist == NULL)
return 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();
c = yylex(0);
if (c != '\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;
case DOT:
t = newtp();
t->type = TDOT;
musthave(WORD, 0); /* gets name of file */
DBGPRINTF7(("COMMAND: DOT clause, yylval.cp is %s\n", yylval.cp));
word(yylval.cp); /* add word to wdlist */
word(NOWORD); /* terminate wdlist */
t->words = copyw(); /* dup wdlist */
break;
}
while (synio(0));
t = namelist(t);
iolist = iosave;
DBGPRINTF(("COMMAND: returning %p\n", t));
return t;
}
static struct op *dowholefile(int type, int mark)
{
struct op *t;
DBGPRINTF(("DOWHOLEFILE: enter, type=%d, mark=%d\n", type, mark));
multiline++;
t = c_list();
multiline--;
t = block(type, t, NOBLOCK, NOWORDS);
DBGPRINTF(("DOWHOLEFILE: return t=%p\n", t));
return t;
}
static struct op *dogroup(int onlydone)
{
int c;
struct op *mylist;
c = yylex(CONTIN);
if (c == DONE && onlydone)
return NULL;
if (c != DO)
zzerr();
mylist = c_list();
musthave(DONE, 0);
return mylist;
}
static struct op *thenpart(void)
{
int c;
struct op *t;
c = yylex(0);
if (c != THEN) {
peeksym = c;
return NULL;
}
t = newtp();
t->type = 0;
t->left = c_list();
if (t->left == NULL)
zzerr();
t->right = elsepart();
return t;
}
static struct op *elsepart(void)
{
int c;
struct op *t;
switch (c = yylex(0)) {
case ELSE:
t = c_list();
if (t == NULL)
zzerr();
return t;
case ELIF:
t = newtp();
t->type = TELIF;
t->left = c_list();
t->right = thenpart();
return t;
default:
peeksym = c;
return NULL;
}
}
static struct op *caselist(void)
{
struct op *t;
t = NULL;
while ((peeksym = yylex(CONTIN)) != ESAC) {
DBGPRINTF(("CASELIST, doing yylex, peeksym=%d\n", peeksym));
t = list(t, casepart());
}
DBGPRINTF(("CASELIST, returning t=%p\n", t));
return t;
}
static struct op *casepart(void)
{
struct op *t;
DBGPRINTF7(("CASEPART: enter...\n"));
t = newtp();
t->type = TPAT;
t->words = pattern();
musthave(')', 0);
t->left = c_list();
peeksym = yylex(CONTIN);
if (peeksym != ESAC)
musthave(BREAK, CONTIN);
DBGPRINTF7(("CASEPART: made newtp(TPAT, t=%p)\n", t));
return t;
}
static char **pattern(void)
{
int c, cf;
cf = CONTIN;
do {
musthave(WORD, cf);
word(yylval.cp);
cf = 0;
c = yylex(0);
} while (c == '|');
peeksym = c;
word(NOWORD);
return copyw();
}
static char **wordlist(void)
{
int c;
c = yylex(0);
if (c != IN) {
peeksym = c;
return NULL;
}
startl = 0;
while ((c = yylex(0)) == WORD)
word(yylval.cp);
word(NOWORD);
peeksym = c;
return copyw();
}
/*
* supporting functions
*/
static struct op *list(struct op *t1, struct op *t2)
{
DBGPRINTF7(("LIST: enter, t1=%p, t2=%p\n", t1, t2));
if (t1 == NULL)
return t2;
if (t2 == NULL)
return t1;
return block(TLIST, t1, t2, NOWORDS);
}
static struct op *block(int type, struct op *t1, struct op *t2, char **wp)
{
struct op *t;
DBGPRINTF7(("BLOCK: enter, type=%d (%s)\n", type, T_CMD_NAMES[type]));
t = newtp();
t->type = type;
t->left = t1;
t->right = t2;
t->words = wp;
DBGPRINTF7(("BLOCK: inserted %p between %p and %p\n", t, t1,
t2));
return t;
}
/* See if given string is a shell multiline (FOR, IF, etc) */
static int rlookup(char *n)
{
const struct res *rp;
DBGPRINTF7(("RLOOKUP: enter, n is %s\n", n));
for (rp = restab; rp->r_name; rp++)
if (strcmp(rp->r_name, n) == 0) {
DBGPRINTF7(("RLOOKUP: match, returning %d\n", rp->r_val));
return rp->r_val; /* Return numeric code for shell multiline */
}
DBGPRINTF7(("RLOOKUP: NO match, returning 0\n"));
return 0; /* Not a shell multiline */
}
static struct op *newtp(void)
{
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;
DBGPRINTF3(("NEWTP: allocated %p\n", t));
return t;
}
static struct op *namelist(struct op *t)
{
DBGPRINTF7(("NAMELIST: enter, t=%p, type %s, iolist=%p\n", t,
T_CMD_NAMES[t->type], iolist));
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(void)
{
char **wd;
wd = getwords(wdlist);
wdlist = 0;
return wd;
}
static void word(char *cp)
{
wdlist = addword(cp, wdlist);
}
static struct ioword **copyio(void)
{
struct ioword **iop;
iop = (struct ioword **) getwords(iolist);
iolist = 0;
return iop;
}
static struct ioword *io(int u, int f, char *cp)
{
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 int yylex(int cf)
{
int c, c1;
int atstart;
c = peeksym;
if (c > 0) {
peeksym = 0;
if (c == '\n')
startl = 1;
return c;
}
nlseen = 0;
atstart = startl;
startl = 0;
yylval.i = 0;
e.linep = line;
/* MALAMO */
line[LINELIM - 1] = '\0';
loop:
while ((c = my_getc(0)) == ' ' || c == '\t') /* Skip whitespace */
;
switch (c) {
default:
if (any(c, "0123456789")) {
c1 = my_getc(0);
unget(c1);
if (c1 == '<' || c1 == '>') {
iounit = c - '0';
goto loop;
}
*e.linep++ = c;
c = c1;
}
break;
case '#': /* Comment, skip to next newline or End-of-string */
while ((c = my_getc(0)) != '\0' && c != '\n');
unget(c);
goto loop;
case 0:
DBGPRINTF5(("YYLEX: return 0, c=%d\n", c));
return c;
case '$':
DBGPRINTF9(("YYLEX: found $\n"));
*e.linep++ = c;
c = my_getc(0);
if (c == '{') {
c = collect(c, '}');
if (c != '\0')
return c;
goto pack;
}
break;
case '`':
case '\'':
case '"':
c = collect(c, c);
if (c != '\0')
return c;
goto pack;
case '|':
case '&':
case ';':
startl = 1;
/* If more chars process them, else return NULL char */
c1 = dual(c);
if (c1 != '\0')
return c1;
return c;
case '^':
startl = 1;
return '|';
case '>':
case '<':
diag(c);
return c;
case '\n':
nlseen++;
gethere();
startl = 1;
if (multiline || cf & CONTIN) {
if (interactive && e.iop <= iostack) {
#if ENABLE_FEATURE_EDITING
current_prompt = cprompt->value;
#else
prs(cprompt->value);
#endif
}
if (cf & CONTIN)
goto loop;
}
return c;
case '(':
case ')':
startl = 1;
return c;
}
unget(c);
pack:
while ((c = my_getc(0)) != '\0' && !any(c, "`$ '\"\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);
if (c != 0) {
startl = 1;
return c;
}
}
yylval.cp = strsave(line, areanum);
return WORD;
}
static int collect(int c, int c1)
{
char s[2];
DBGPRINTF8(("COLLECT: enter, c=%d, c1=%d\n", c, c1));
*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) {
#if ENABLE_FEATURE_EDITING
current_prompt = cprompt->value;
#else
prs(cprompt->value);
#endif
}
*e.linep++ = c;
}
*e.linep++ = c;
DBGPRINTF8(("COLLECT: return 0, line is %s\n", line));
return 0;
}
/* "multiline commands" helper func */
/* see if next 2 chars form a shell multiline */
static int dual(int c)
{
char s[3];
char *cp = s;
DBGPRINTF8(("DUAL: enter, c=%d\n", c));
*cp++ = c; /* c is the given "peek" char */
*cp++ = my_getc(0); /* get next char of input */
*cp = '\0'; /* add EOS marker */
c = rlookup(s); /* see if 2 chars form a shell multiline */
if (c == 0)
unget(*--cp); /* String is not a shell multiline, put peek char back */
return c; /* String is multiline, return numeric multiline (restab) code */
}
static void diag(int ec)
{
int c;
DBGPRINTF8(("DIAG: enter, ec=%d\n", ec));
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(unsigned size)
{
char *t;
t = getcell(size);
if (t == NULL) {
DBGPRINTF2(("TREE: getcell(%d) failed!\n", size));
prs("command line too complicated\n");
fail();
/* NOTREACHED */
}
return t;
}
/* VARARGS1 */
/* ARGSUSED */
/* -------- exec.c -------- */
static struct op **find1case(struct op *t, const char *w)
{
struct op *t1;
struct op **tp;
char **wp;
char *cp;
if (t == NULL) {
DBGPRINTF3(("FIND1CASE: enter, t==NULL, returning.\n"));
return NULL;
}
DBGPRINTF3(("FIND1CASE: enter, t->type=%d (%s)\n", t->type,
T_CMD_NAMES[t->type]));
if (t->type == TLIST) {
tp = find1case(t->left, w);
if (tp != NULL) {
DBGPRINTF3(("FIND1CASE: found one to the left, returning tp=%p\n", tp));
return tp;
}
t1 = t->right; /* TPAT */
} else
t1 = t;
for (wp = t1->words; *wp;) {
cp = evalstr(*wp++, DOSUB);
if (cp && gmatch(w, cp)) {
DBGPRINTF3(("FIND1CASE: returning &t1->left= %p.\n",
&t1->left));
return &t1->left;
}
}
DBGPRINTF(("FIND1CASE: returning NULL\n"));
return NULL;
}
static struct op *findcase(struct op *t, const char *w)
{
struct op **tp;
tp = find1case(t, w);
return tp != NULL ? *tp : NULL;
}
/*
* execute tree
*/
static int execute(struct op *t, int *pin, int *pout, int act)
{
struct op *t1;
volatile int i, rv, a;
const char *cp;
char **wp, **wp2;
struct var *vp;
struct op *outtree_save;
struct brkcon bc;
#if __GNUC__
/* Avoid longjmp clobbering */
(void) &wp;
#endif
if (t == NULL) {
DBGPRINTF4(("EXECUTE: enter, t==null, returning.\n"));
return 0;
}
DBGPRINTF(("EXECUTE: t=%p, t->type=%d (%s), t->words is %s\n", t,
t->type, T_CMD_NAMES[t->type],
((t->words == NULL) ? "NULL" : t->words[0])));
rv = 0;
a = areanum++;
wp = (wp2 = t->words) != NULL
? eval(wp2, t->type == TCOM ? DOALL : DOALL & ~DOKEY)
: NULL;
switch (t->type) {
case TDOT:
DBGPRINTF3(("EXECUTE: TDOT\n"));
outtree_save = outtree;
newfile(evalstr(t->words[0], DOALL));
t->left = dowholefile(TLIST, 0);
t->right = NULL;
outtree = outtree_save;
if (t->left)
rv = execute(t->left, pin, pout, 0);
if (t->right)
rv = execute(t->right, pin, pout, 0);
break;
case TPAREN:
rv = execute(t->left, pin, pout, 0);
break;
case TCOM:
rv = forkexec(t, pin, pout, act, wp);
break;
case TPIPE:
{
int pv[2];
rv = openpipe(pv);
if (rv < 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;
DBGPRINTF7(("EXECUTE: TASYNC clause, calling vfork()...\n"));
i = vfork();
if (i == 0) { /* child */
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
if (interactive)
signal(SIGTERM, SIG_DFL);
interactive = 0;
if (pin == NULL) {
close(0);
open(bb_dev_null, 0);
}
_exit(execute(t->left, pin, pout, FEXEC));
}
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);
}
break;
case TOR:
case TAND:
rv = execute(t->left, pin, pout, 0);
t1 = t->right;
if (t1 != NULL && (rv == 0) == (t->type == TAND))
rv = execute(t1, pin, pout, 0);
break;
case TFOR:
if (wp == NULL) {
wp = dolv + 1;
i = dolc;
if (i < 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:
cp = evalstr(t->str, DOSUB | DOTRIM);
if (cp == NULL)
cp = "";
DBGPRINTF7(("EXECUTE: TCASE, t->str is %s, cp is %s\n",
((t->str == NULL) ? "NULL" : t->str),
((cp == NULL) ? "NULL" : cp)));
t1 = findcase(t->left, cp);
if (t1 != NULL) {
DBGPRINTF7(("EXECUTE: TCASE, calling execute(t=%p, t1=%p)...\n", t, t1));
rv = execute(t1, pin, pout, 0);
DBGPRINTF7(("EXECUTE: TCASE, back from execute(t=%p, t1=%p)...\n", t, t1));
}
break;
case TBRACE:
/*
iopp = t->ioact;
if (i)
while (*iopp)
if (iosetup(*iopp++, pin!=NULL, pout!=NULL)) {
rv = -1;
break;
}
*/
if (rv >= 0) {
t1 = t->left;
if (t1) {
rv = execute(t1, pin, pout, 0);
}
}
break;
};
broken:
t->words = wp2;
isbreak = 0;
freehere(areanum);
freearea(areanum);
areanum = a;
if (interactive && intr) {
closeall();
fail();
}
i = trapset;
if (i != 0) {
trapset = 0;
runtrap(i);
}
DBGPRINTF(("EXECUTE: returning from t=%p, rv=%d\n", t, rv));
return rv;
}
typedef int (*builtin_func_ptr)(struct op *);
static builtin_func_ptr inbuilt(const char *s) {
const struct builtincmd *bp;
for (bp = builtincmds; bp->name != NULL; bp++)
if (strcmp(bp->name, s) == 0)
return bp->builtinfunc;
return NULL;
}
static int forkexec(struct op *t, int *pin, int *pout, int act, char **wp)
{
pid_t newpid;
int i, rv;
builtin_func_ptr shcom = NULL;
int f;
const char *cp = NULL;
struct ioword **iopp;
int resetsig;
char **owp;
int forked = 0;
int *hpin = pin;
int *hpout = pout;
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
DBGPRINTF(("FORKEXEC: t=%p, pin %p, pout %p, act %d\n", t, pin,
pout, act));
DBGPRINTF7(("FORKEXEC: t->words is %s\n",
((t->words == NULL) ? "NULL" : t->words[0])));
owp = wp;
resetsig = 0;
rv = -1; /* system-detected error */
if (t->type == TCOM) {
while (*wp++ != NULL);
cp = *wp;
/* strip all initial assignments */
/* not correct wrt PATH=yyy command etc */
if (flag['x']) {
DBGPRINTF9(("FORKEXEC: echo'ing, cp=%p, wp=%p, owp=%p\n",
cp, wp, owp));
echo(cp ? wp : owp);
}
if (cp == NULL && t->ioact == NULL) {
while ((cp = *owp++) != NULL && assign(cp, COPYV))
/**/;
DBGPRINTF(("FORKEXEC: returning setstatus()\n"));
return setstatus(0);
}
if (cp != NULL) {
shcom = inbuilt(cp);
}
}
t->words = wp;
f = act;
DBGPRINTF(("FORKEXEC: shcom %p, f&FEXEC 0x%x, owp %p\n", shcom,
f & FEXEC, owp));
if (shcom == NULL && (f & FEXEC) == 0) {
/* Save values in case the child process alters them */
hpin = pin;
hpout = pout;
hwp = *wp;
hinteractive = interactive;
hintr = intr;
hbrklist = brklist;
hexecflg = execflg;
DBGPRINTF3(("FORKEXEC: calling vfork()...\n"));
newpid = vfork();
if (newpid == -1) {
DBGPRINTF(("FORKEXEC: ERROR, cannot vfork()!\n"));
return -1;
}
if (newpid > 0) { /* Parent */
/* Restore values */
pin = hpin;
pout = hpout;
*wp = hwp;
interactive = hinteractive;
intr = hintr;
brklist = hbrklist;
execflg = hexecflg;
/* moved up
if (i == -1)
return rv;
*/
if (pin != NULL)
closepipe(pin);
return (pout == NULL ? setstatus(waitfor(newpid, 0)) : 0);
}
/* Must be the child process, pid should be 0 */
DBGPRINTF(("FORKEXEC: child process, shcom=%p\n", shcom));
if (interactive) {
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
resetsig = 1;
}
interactive = 0;
intr = 0;
forked = 1;
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");
if (forked)
_exit(-1);
return -1;
}
#endif
if (pin != NULL) {
dup2(pin[0], 0);
closepipe(pin);
}
if (pout != NULL) {
dup2(pout[1], 1);
closepipe(pout);
}
iopp = t->ioact;
if (iopp != NULL) {
if (shcom != NULL && shcom != doexec) {
prs(cp);
err(": cannot redirect shell command");
if (forked)
_exit(-1);
return -1;
}
while (*iopp)
if (iosetup(*iopp++, pin != NULL, pout != NULL)) {
if (forked)
_exit(rv);
return rv;
}
}
if (shcom) {
i = setstatus((*shcom) (t));
if (forked)
_exit(i);
DBGPRINTF(("FORKEXEC: returning i=%d\n", i));
return i;
}
/* 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(0, NULL));
prs(wp[0]);
prs(": ");
err(cp);
if (!execflg)
trap[0] = NULL;
DBGPRINTF(("FORKEXEC: calling leave(), pid=%d\n", newpid));
leave();
/* NOTREACHED */
_exit(1);
}
/*
* 0< 1> are ignored as required
* within pipelines.
*/
static int iosetup(struct ioword *iop, int pipein, int pipeout)
{
int u = -1;
char *cp = NULL;
const char *msg;
DBGPRINTF(("IOSETUP: iop %p, pipein %i, pipeout %i\n", iop,
pipein, pipeout));
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; /* huh?? */
cp = evalstr(cp, DOSUB | DOTRIM);
if (cp == 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 = (char*)"here file";
break;
case IOWRITE | IOCAT:
u = open(cp, 1);
if (u >= 0) {
lseek(u, (long) 0, SEEK_END);
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;
}
if (u != iop->io_unit) {
dup2(u, iop->io_unit);
close(u);
}
return 0;
}
/*
* Enter a new loop level (marked for break/continue).
*/
static void brkset(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(int lastpid, int canintr)
{
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 {
rv = WAITSIG(s);
if (rv != 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(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 const char *rexecve(char *c, char **v, char **envp)
{
int i;
const char *sp;
char *tp;
int eacces = 0, asis = 0;
char *name = c;
if (ENABLE_FEATURE_SH_STANDALONE_SHELL) {
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(CONFIG_BUSYBOX_EXEC_PATH, v, envp);
}
}
DBGPRINTF(("REXECVE: c=%p, v=%p, envp=%p\n", c, v, envp));
sp = any('/', c) ? "" : path->value;
asis = (*sp == '\0');
while (asis || *sp != '\0') {
asis = 0;
tp = e.linep;
for (; *sp != '\0'; tp++) {
*tp = *sp++;
if (*tp == ':') {
asis = (*sp == '\0');
break;
}
}
if (tp != e.linep)
*tp++ = '/';
for (i = 0; (*tp++ = c[i++]) != '\0';);
DBGPRINTF3(("REXECVE: e.linep is %s\n", e.linep));
execve(e.linep, v, envp);
switch (errno) {
case ENOEXEC:
*v = e.linep;
tp = *--v;
*v = e.linep;
execve(DEFAULT_SHELL, v, envp);
*v = tp;
return "no Shell";
case ENOMEM:
return (char *) bb_msg_memory_exhausted;
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(struct ioarg *argp, int (*f) (struct ioarg *))
{
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
DBGPRINTF(("RUN: enter, areanum %d, outtree %p, failpt %p\n",
areanum, outtree, failpt));
areanum++;
swdlist = wdlist;
siolist = iolist;
otree = outtree;
ofail = failpt;
rv = -1;
errpt = ev;
if (newenv(setjmp(errpt)) == 0) {
wdlist = 0;
iolist = 0;
pushio(argp, f);
e.iobase = e.iop;
yynerrs = 0;
failpt = rt;
if (setjmp(failpt) == 0 && yyparse() == 0)
rv = execute(outtree, NOPIPE, NOPIPE, 0);
quitenv();
} else {
DBGPRINTF(("RUN: error from newenv()!\n"));
}
wdlist = swdlist;
iolist = siolist;
failpt = ofail;
outtree = otree;
freearea(areanum--);
return rv;
}
/* -------- do.c -------- */
/*
* built-in commands: doX
*/
static int dohelp(struct op *t)
{
int col;
const struct builtincmd *x;
puts("\nBuilt-in commands:\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) {
puts("");
col = 0;
}
}
#if ENABLE_FEATURE_SH_STANDALONE_SHELL
{
int i;
const struct BB_applet *applet;
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) {
puts("");
col = 0;
}
}
}
#endif
puts("\n");
return EXIT_SUCCESS;
}
static int dolabel(struct op *t)
{
return 0;
}
static int dochdir(struct op *t)
{
const char *cp, *er;
cp = t->words[1];
if (cp == NULL) {
cp = homedir->value;
if (cp == 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(struct op *t)
{
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(struct op *t)
{
const char *cp;
if (interactive) {
signal(SIGINT, SIG_DFL);
signal(SIGQUIT, SIG_DFL);
}
cp = rexecve(t->words[0], t->words, makenv(0, NULL));
prs(t->words[0]);
prs(": ");
err(cp);
return 1;
}
static int doumask(struct op *t)
{
int i, n;
char *cp;
cp = t->words[1];
if (cp == NULL) {
i = umask(0);
umask(i);
for (n = 3 * 4; (n -= 3) >= 0;)
putc('0' + ((i >> n) & 07), stderr);
putc('\n', stderr);
} else {
/* huh??? '8','9' are not allowed! */
for (n = 0; *cp >= '0' && *cp <= '9'; cp++)
n = n * 8 + (*cp - '0');
umask(n);
}
return 0;
}
static int doexec(struct op *t)
{
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;
failpt = ex;
if (setjmp(failpt) == 0)
execute(t, NOPIPE, NOPIPE, FEXEC);
failpt = ofail;
execflg = 0;
return 1;
}
static int dodot(struct op *t)
{
int i;
const char *sp;
char *tp;
char *cp;
int maltmp;
DBGPRINTF(("DODOT: enter, t=%p, tleft %p, tright %p, e.linep is %s\n", t, t->left, t->right, ((e.linep == NULL) ? "NULL" : e.linep)));
cp = t->words[1];
if (cp == NULL) {
DBGPRINTF(("DODOT: bad args, ret 0\n"));
return 0;
}
DBGPRINTF(("DODOT: cp is %s\n", cp));
sp = any('/', cp) ? ":" : path->value;
DBGPRINTF(("DODOT: sp is %s, e.linep is %s\n",
((sp == NULL) ? "NULL" : sp),
((e.linep == NULL) ? "NULL" : e.linep)));
while (*sp) {
tp = e.linep;
while (*sp && (*tp = *sp++) != ':')
tp++;
if (tp != e.linep)
*tp++ = '/';
for (i = 0; (*tp++ = cp[i++]) != '\0';);
/* Original code */
i = open(e.linep, 0);
if (i >= 0) {
exstat = 0;
maltmp = remap(i);
DBGPRINTF(("DODOT: remap=%d, exstat=%d, e.iofd %d, i %d, e.linep is %s\n", maltmp, exstat, e.iofd, i, e.linep));
next(maltmp); /* Basically a PUSHIO */
DBGPRINTF(("DODOT: returning exstat=%d\n", exstat));
return exstat;
}
} /* while */
prs(cp);
err(": not found");
return -1;
}
static int dowait(struct op *t)
{
int i;
char *cp;
cp = t->words[1];
if (cp != NULL) {
i = getn(cp);
if (i == 0)
return 0;
} else
i = -1;
setstatus(waitfor(i, 1));
return 0;
}
static int doread(struct op *t)
{
char *cp, **wp;
int nb = 0;
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++) {
nb = read(0, cp, sizeof(*cp));
if (nb != sizeof(*cp))
break;
nl = (*cp == '\n');
if (nl || (wp[1] && any(*cp, ifs->value)))
break;
}
*cp = '\0';
if (nb <= 0)
break;
setval(lookup(*wp), e.linep);
}
return nb <= 0;
}
static int doeval(struct op *t)
{
return RUN(awordlist, t->words + 1, wdchar);
}
static int dotrap(struct op *t)
{
int n, i;
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(char *s)
{
int n;
n = getn(s);
if (n < 0 || n > _NSIG) {
err("trap: bad signal number");
n = 0;
}
return n;
}
static void setsig(int n, sighandler_t f)
{
if (n == 0)
return;
if (signal(n, SIG_IGN) != SIG_IGN || ourtrap[n]) {
ourtrap[n] = 1;
signal(n, f);
}
}
static int getn(char *as)
{
char *s;
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(struct op *t)
{
return brkcontin(t->words[1], 1);
}
static int docontinue(struct op *t)
{
return brkcontin(t->words[1], 0);
}
static int brkcontin(char *cp, int val)
{
struct brkcon *bc;
int nl;
nl = cp == NULL ? 1 : getn(cp);
if (nl <= 0)
nl = 999;
do {
bc = brklist;
if (bc == 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(struct op *t)
{
char *cp;
execflg = 0;
cp = t->words[1];
if (cp != NULL)
setstatus(getn(cp));
DBGPRINTF(("DOEXIT: calling leave(), t=%p\n", t));
leave();
/* NOTREACHED */
return 0;
}
static int doexport(struct op *t)
{
rdexp(t->words + 1, export, EXPORT);
return 0;
}
static int doreadonly(struct op *t)
{
rdexp(t->words + 1, ronly, RONLY);
return 0;
}
static void rdexp(char **wp, void (*f) (struct var *), int key)
{
DBGPRINTF6(("RDEXP: enter, wp=%p, func=%p, key=%d\n", wp, f, key));
DBGPRINTF6(("RDEXP: *wp=%s\n", *wp));
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(char *s)
{
prs(s);
err(": bad identifier");
}
static int doset(struct op *t)
{
struct var *vp;
char *cp;
int n;
cp = t->words[1];
if (cp == 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(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 op *t)
{
struct tms buf;
long 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;
}
/* -------- eval.c -------- */
/*
* ${}
* `command`
* blank interpretation
* quoting
* glob
*/
static char **eval(char **ap, int f)
{
struct wdblock *wb;
char **wp;
char **wf;
jmp_buf ev;
#if __GNUC__
/* Avoid longjmp clobbering */
(void) &wp;
(void) &ap;
#endif
DBGPRINTF4(("EVAL: enter, f=%d\n", f));
wp = NULL;
wb = NULL;
wf = NULL;
errpt = ev;
if (newenv(setjmp(errpt)) == 0) {
while (*ap && isassign(*ap))
expand(*ap++, &wb, f & ~DOGLOB);
if (flag['k']) {
for (wf = ap; *wf; wf++) {
if (isassign(*wf))
expand(*wf, &wb, f & ~DOGLOB);
}
}
for (wb = addword((char *) 0, wb); *ap; ap++) {
if (!flag['k'] || !isassign(*ap))
expand(*ap, &wb, f & ~DOKEY);
}
wb = addword((char *) 0, wb);
wp = getwords(wb);
quitenv();
} else
gflg = 1;
return gflg ? (char **) NULL : wp;
}
/*
* Make the exported environment from the exported
* names in the dictionary. Keyword assignments
* will already have been done.
*/
static char **makenv(int all, struct wdblock *wb)
{
struct var *vp;
DBGPRINTF5(("MAKENV: enter, all=%d\n", all));
for (vp = vlist; vp; vp = vp->next)
if (all || vp->status & EXPORT)
wb = addword(vp->name, wb);
wb = addword((char *) 0, wb);
return getwords(wb);
}
static int expand(const char *cp, struct wdblock **wbp, int f)
{
jmp_buf ev;
char *xp;
#if __GNUC__
/* Avoid longjmp clobbering */
(void) &cp;
#endif
DBGPRINTF3(("EXPAND: enter, f=%d\n", f));
gflg = 0;
if (cp == NULL)
return 0;
if (!anys("$`'\"", cp) && !anys(ifs->value, cp)
&& ((f & DOGLOB) == 0 || !anys("[*?", cp))
) {
xp = strsave(cp, areanum);
if (f & DOTRIM)
unquote(xp);
*wbp = addword(xp, *wbp);
return 1;
}
errpt = ev;
if (newenv(setjmp(errpt)) == 0) {
PUSHIO(aword, cp, strchar);
e.iobase = e.iop;
while ((xp = blank(f)) && gflg == 0) {
e.linep = xp;
xp = strsave(xp, areanum);
if ((f & DOGLOB) == 0) {
if (f & DOTRIM)
unquote(xp);
*wbp = addword(xp, *wbp);
} else
*wbp = glob(xp, *wbp);
}
quitenv();
} else
gflg = 1;
return gflg == 0;
}
static char *evalstr(char *cp, int f)
{
struct wdblock *wb;
DBGPRINTF6(("EVALSTR: enter, cp=%p, f=%d\n", cp, f));
wb = NULL;
if (expand(cp, &wb, f)) {
if (wb == NULL || wb->w_nword == 0
|| (cp = wb->w_words[0]) == NULL
) {
// TODO: I suspect that
// char *evalstr(char *cp, int f) is actually
// const char *evalstr(const char *cp, int f)!
cp = (char*)"";
}
DELETE(wb);
} else
cp = NULL;
return cp;
}
/*
* Blank interpretation and quoting
*/
static char *blank(int f)
{
int c, c1;
char *sp;
int scanequals, foundequals;
DBGPRINTF3(("BLANK: enter, f=%d\n", f));
sp = e.linep;
scanequals = f & DOKEY;
foundequals = 0;
loop:
c = subgetc('"', foundequals);
switch (c) {
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(char ec, int quoted)
{
char c;
DBGPRINTF3(("SUBGETC: enter, quoted=%d\n", quoted));
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);
if (c == 0) {
e.iop->task = XDOLL;
goto again;
}
}
}
return c;
}
/*
* Prepare to generate the string returned by ${} substitution.
*/
static int dollar(int quoted)
{
int otask;
struct io *oiop;
char *dolp;
char *s, c, *cp = NULL;
struct var *vp;
DBGPRINTF3(("DOLLAR: enter, quoted=%d\n", quoted));
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);
dolp = vp->value;
if (dolp == null) {
switch (c) {
case '=':
if (isdigit(*s)) {
err("cannot use ${...=...} with $n");
gflg++;
break;
}
setval(vp, cp);
dolp = vp->value;
break;
case '-':
dolp = strsave(cp, areanum);
break;
case '?':
if (*cp == 0) {
prs("missing value for ");
err(s);
} else
err(cp);
gflg++;
break;
}
} else if (c == '+')
dolp = strsave(cp, areanum);
if (flag['u'] && dolp == null) {
prs("unset variable: ");
err(s);
gflg++;
}
e.linep = s;
PUSHIO(aword, dolp, quoted ? qstrchar : strchar);
return 0;
}
/*
* Run the command in `...` and read its output.
*/
static int grave(int quoted)
{
const char *cp;
int i;
int j;
int pf[2];
static char child_cmd[LINELIM];
const char *src;
char *dest;
int count;
int ignore;
int ignore_once;
char *argument_list[4];
struct wdblock *wb = NULL;
#if __GNUC__
/* Avoid longjmp clobbering */
(void) &cp;
#endif
for (cp = e.iop->argp->aword; *cp != '`'; cp++) {
if (*cp == 0) {
err("no closing `");
return 0;
}
}
/* string copy with dollar expansion */
src = e.iop->argp->aword;
dest = child_cmd;
count = 0;
ignore = 0;
ignore_once = 0;
while ((*src != '`') && (count < LINELIM)) {
if (*src == '\'')
ignore = !ignore;
if (*src == '\\')
ignore_once = 1;
if (*src == '$' && !ignore && !ignore_once) {
struct var *vp;
char var_name[LINELIM];
char alt_value[LINELIM];
int var_index = 0;
int alt_index = 0;
char operator = 0;
int braces = 0;
char *value;
src++;
if (*src == '{') {
braces = 1;
src++;
}
var_name[var_index++] = *src++;
while (isalnum(*src) || *src=='_')
var_name[var_index++] = *src++;
var_name[var_index] = 0;
if (braces) {
switch (*src) {
case '}':
break;
case '-':
case '=':
case '+':
case '?':
operator = * src;
break;
default:
err("unclosed ${\n");
return 0;
}
if (operator) {
src++;
while (*src && (*src != '}')) {
alt_value[alt_index++] = *src++;
}
alt_value[alt_index] = 0;
if (*src != '}') {
err("unclosed ${\n");
return 0;
}
}
src++;
}
if (isalpha(*var_name)) {
/* let subshell handle it instead */
char *namep = var_name;
*dest++ = '$';
if (braces)
*dest++ = '{';
while (*namep)
*dest++ = *namep++;
if (operator) {
char *altp = alt_value;
*dest++ = operator;
while (*altp)
*dest++ = *altp++;
}
if (braces)
*dest++ = '}';
wb = addword(lookup(var_name)->name, wb);
} else {
/* expand */
vp = lookup(var_name);
if (vp->value != null)
value = (operator == '+') ?
alt_value : vp->value;
else if (operator == '?') {
err(alt_value);
return 0;
} else if (alt_index && (operator != '+')) {
value = alt_value;
if (operator == '=')
setval(vp, value);
} else
continue;
while (*value && (count < LINELIM)) {
*dest++ = *value++;
count++;
}
}
} else {
*dest++ = *src++;
count++;
ignore_once = 0;
}
}
*dest = '\0';
if (openpipe(pf) < 0)
return 0;
while ((i = vfork()) == -1 && errno == EAGAIN);
DBGPRINTF3(("GRAVE: i is %p\n", io));
if (i < 0) {
closepipe(pf);
err((char *) bb_msg_memory_exhausted);
return 0;
}
if (i != 0) {
waitpid(i, NULL, 0);
e.iop->argp->aword = ++cp;
close(pf[1]);
PUSHIO(afile, remap(pf[0]),
(int (*)(struct ioarg *)) ((quoted) ? qgravechar : gravechar));
return 1;
}
/* allow trapped signals */
/* XXX - Maybe this signal stuff should go as well? */
for (j = 0; j <= _NSIG; j++)
if (ourtrap[j] && signal(j, SIG_IGN) != SIG_IGN)
signal(j, SIG_DFL);
dup2(pf[1], 1);
closepipe(pf);
argument_list[0] = (char *) DEFAULT_SHELL;
argument_list[1] = (char *) "-c";
argument_list[2] = child_cmd;
argument_list[3] = NULL;
cp = rexecve(argument_list[0], argument_list, makenv(1, wb));
prs(argument_list[0]);
prs(": ");
err(cp);
_exit(1);
}
static char *unquote(char *as)
{
char *s;
s = as;
if (s != 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(char *cp, struct wdblock *wb)
{
int i;
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), NULL); 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(char *we, char *pp)
{
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(char *start1, char *end1, char *middle, char *end)
{
char *p;
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(struct wdblock *wb)
{
int i;
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(char *p1, char *p2)
{
return strcmp(*(char **) p1, *(char **) p2);
}
/* -------- word.c -------- */
static struct wdblock *newword(int nw)
{
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(char *wd, struct wdblock *wb)
{
struct wdblock *wb2;
int nw;
if (wb == NULL)
wb = newword(NSTART);
nw = wb->w_nword;
if (nw >= 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(struct wdblock *wb)
{
char **wd;
int nb;
if (wb == NULL)
return NULL;
if (wb->w_nword == 0) {
DELETE(wb);
return 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;
}
static int (*func) (char *, char *);
static int globv;
static void glob3(char *i, char *j, char *k)
{
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);
}
static void glob2(char *i, char *j)
{
char *index1, *index2, c;
int m;
m = globv;
index1 = i;
index2 = j;
do {
c = *index1;
*index1++ = *index2;
*index2++ = c;
} while (--m);
}
static void glob1(char *base, char *lim)
{
char *i, *j;
int v2;
char *lptr, *hptr;
int c;
unsigned n;
v2 = globv;
top:
n = (int) (lim - base);
if (n <= v2)
return;
n = v2 * (n / (2 * v2));
hptr = lptr = base + n;
i = base;
j = lim - v2;
for (;;) {
if (i < lptr) {
c = (*func) (i, lptr);
if (c == 0) {
lptr -= v2;
glob2(i, lptr);
continue;
}
if (c < 0) {
i += v2;
continue;
}
}
begin:
if (j > hptr) {
c = (*func) (hptr, j);
if (c == 0) {
hptr += v2;
glob2(hptr, j);
goto begin;
}
if (c > 0) {
if (i == lptr) {
hptr += v2;
glob3(i, hptr, 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;
}
lptr -= v2;
glob3(j, lptr, i);
j = (hptr -= v2);
}
}
static void glob0(char *a0, unsigned a1, int a2, int (*a3) (char *, char *))
{
func = a3;
globv = a2;
glob1(a0, a0 + a1 * a2);
}
/* -------- io.c -------- */
/*
* shell IO
*/
static int my_getc(int ec)
{
int c;
if (e.linep > elinep) {
while ((c = readc()) != '\n' && c);
err("input line too long");
gflg++;
return c;
}
c = readc();
if ((ec != '\'') && (ec != '`') && (e.iop->task != XGRAVE)) {
if (c == '\\') {
c = readc();
if (c == '\n' && ec != '\"')
return my_getc(ec);
c |= QUOTE;
}
}
return c;
}
static void unget(int c)
{
if (e.iop >= e.iobase)
e.iop->peekc = c;
}
static int eofc(void)
{
return e.iop < e.iobase || (e.iop->peekc == 0 && e.iop->prev == 0);
}
static int readc(void)
{
int c;
RCPRINTF(("READC: e.iop %p, e.iobase %p\n", e.iop, e.iobase));
for (; e.iop >= e.iobase; e.iop--) {
RCPRINTF(("READC: e.iop %p, peekc 0x%x\n", e.iop, e.iop->peekc));
c = e.iop->peekc;
if (c != '\0') {
e.iop->peekc = 0;
return c;
}
if (e.iop->prev != 0) {
c = (*e.iop->iofn)(e.iop->argp, e.iop);
if (c != '\0') {
if (c == -1) {
e.iop++;
continue;
}
if (e.iop == iostack)
ioecho(c);
e.iop->prev = c;
return e.iop->prev;
}
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) {
e.iop->prev = 0;
return e.iop->prev;
}
if (interactive && e.iop == iostack + 1) {
#if ENABLE_FEATURE_EDITING
current_prompt = prompt->value;
#else
prs(prompt->value);
#endif
}
}
} /* FOR */
if (e.iop >= iostack) {
RCPRINTF(("READC: return 0, e.iop %p\n", e.iop));
return 0;
}
DBGPRINTF(("READC: leave()...\n"));
leave();
/* NOTREACHED */
return 0;
}
static void ioecho(char c)
{
if (flag['v'])
write(2, &c, sizeof c);
}
static void pushio(struct ioarg *argp, int (*fn) (struct ioarg *))
{
DBGPRINTF(("PUSHIO: argp %p, argp->afid 0x%x, e.iop %p\n", argp,
argp->afid, e.iop));
/* Set env ptr for io source to next array spot and check for array overflow */
if (++e.iop >= &iostack[NPUSH]) {
e.iop--;
err("Shell input nested too deeply");
gflg++;
return;
}
/* We did not overflow the NPUSH array spots so setup data structs */
e.iop->iofn = (int (*)(struct ioarg *, struct io *)) fn; /* Store data source func ptr */
if (argp->afid != AFID_NOBUF)
e.iop->argp = argp;
else {
e.iop->argp = ioargstack + (e.iop - iostack); /* MAL - index into stack */
*e.iop->argp = *argp; /* copy data from temp area into stack spot */
/* MAL - mainbuf is for 1st data source (command line?) and all nested use a single shared buffer? */
if (e.iop == &iostack[0])
e.iop->argp->afbuf = &mainbuf;
else
e.iop->argp->afbuf = &sharedbuf;
/* MAL - if not a termimal AND (commandline OR readable file) then give it a buffer id? */
/* This line appears to be active when running scripts from command line */
if ((isatty(e.iop->argp->afile) == 0)
&& (e.iop == &iostack[0]
|| lseek(e.iop->argp->afile, 0L, SEEK_CUR) != -1)) {
if (++bufid == AFID_NOBUF) /* counter rollover check, AFID_NOBUF = 11111111 */
bufid = AFID_ID; /* AFID_ID = 0 */
e.iop->argp->afid = bufid; /* assign buffer id */
}
DBGPRINTF(("PUSHIO: iostack %p, e.iop %p, afbuf %p\n",
iostack, e.iop, e.iop->argp->afbuf));
DBGPRINTF(("PUSHIO: mbuf %p, sbuf %p, bid %d, e.iop %p\n",
&mainbuf, &sharedbuf, bufid, e.iop));
}
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 == (int (*)(struct ioarg *)) gravechar
|| fn == (int (*)(struct ioarg *)) qgravechar)
e.iop->task = XGRAVE;
else
e.iop->task = XOTHER;
}
static struct io *setbase(struct io *ip)
{
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(struct ioarg *ap)
{
int c;
if (ap->aword == NULL)
return 0;
c = *ap->aword++;
if (c == 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(struct ioarg *ap)
{
char c;
char **wl;
wl = ap->awordlist;
if (wl == NULL)
return 0;
if (*wl != NULL) {
c = *(*wl)++;
if (c != 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(struct ioarg *ap)
{
char *wp;
wp = *ap->awordlist++;
if (wp != NULL) {
PUSHIO(aword, wp, *ap->awordlist == NULL ? strchar : xxchar);
return -1;
}
return 0;
}
static int xxchar(struct ioarg *ap)
{
int c;
if (ap->aword == NULL)
return 0;
c = *ap->aword++;
if (c == '\0') {
ap->aword = NULL;
return ' ';
}
return c;
}
/*
* Produce the characters from a single word (string).
*/
static int strchar(struct ioarg *ap)
{
if (ap->aword == NULL)
return 0;
return *ap->aword++;
}
/*
* Produce quoted characters from a single word (string).
*/
static int qstrchar(struct ioarg *ap)
{
int c;
if (ap->aword == NULL)
return 0;
c = *ap->aword++;
if (c)
c |= QUOTE;
return c;
}
/*
* Return the characters from a file.
*/
static int filechar(struct ioarg *ap)
{
int i;
char c;
struct iobuf *bp = ap->afbuf;
if (ap->afid != AFID_NOBUF) {
i = (ap->afid != bp->id);
if (i || bp->bufp == bp->ebufp) {
if (i)
lseek(ap->afile, ap->afpos, SEEK_SET);
i = safe_read(ap->afile, bp->buf, sizeof(bp->buf));
if (i <= 0) {
closef(ap->afile);
return 0;
}
bp->id = ap->afid;
bp->bufp = bp->buf;
bp->ebufp = bp->bufp + i;
}
ap->afpos++;
return *bp->bufp++ & 0177;
}
#if ENABLE_FEATURE_EDITING
if (interactive && isatty(ap->afile)) {
static char mycommand[BUFSIZ];
static int position = 0, size = 0;
while (size == 0 || position >= size) {
read_line_input(current_prompt, mycommand, BUFSIZ, line_input_state);
size = strlen(mycommand);
position = 0;
}
c = mycommand[position];
position++;
return c;
}
#endif
i = safe_read(ap->afile, &c, sizeof(c));
return i == sizeof(c) ? (c & 0x7f) : (closef(ap->afile), 0);
}
/*
* Return the characters from a here temp file.
*/
static int herechar(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(struct ioarg *ap, struct io *iop)
{
int c;
c = qgravechar(ap, iop) & ~QUOTE;
if (c == '\n')
c = ' ';
return c;
}
static int qgravechar(struct ioarg *ap, struct io *iop)
{
int c;
DBGPRINTF3(("QGRAVECHAR: enter, ap=%p, iop=%p\n", ap, iop));
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(struct ioarg *ap)
{
int c;
c = filechar(ap);
if (c == '\n') {
if (!multiline) {
closef(ap->afile);
ap->afile = -1; /* illegal value */
}
}
return c;
}
/*
* remap fd into Shell's fd space
*/
static int remap(int fd)
{
int i;
int map[NOFILE];
int newfd;
DBGPRINTF(("REMAP: fd=%d, e.iofd=%d\n", fd, e.iofd));
if (fd < e.iofd) {
for (i = 0; i < NOFILE; i++)
map[i] = 0;
do {
map[fd] = 1;
newfd = dup(fd);
fd = newfd;
} 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(int *pv)
{
int i;
i = pipe(pv);
if (i < 0)
err("can't create pipe - try again");
return i;
}
static void closepipe(int *pv)
{
if (pv != NULL) {
close(*pv++);
close(*pv);
}
}
/* -------- here.c -------- */
/*
* here documents
*/
static void markhere(char *s, struct ioword *iop)
{
struct here *h, *lh;
DBGPRINTF7(("MARKHERE: enter, s=%p\n", s));
h = (struct here *) space(sizeof(struct here));
if (h == NULL)
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(void)
{
struct here *h, *hp;
DBGPRINTF7(("GETHERE: enter...\n"));
/* 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(char **name, char *s, int ec)
{
int tf;
char tname[30] = ".msh_XXXXXX";
int c;
jmp_buf ev;
char myline[LINELIM + 1];
char *thenext;
DBGPRINTF7(("READHERE: enter, name=%p, s=%p\n", name, s));
tf = mkstemp(tname);
if (tf < 0)
return;
*name = strsave(tname, areanum);
errpt = ev;
if (newenv(setjmp(errpt)) != 0)
unlink(tname);
else {
pushio(e.iop->argp, (int (*)(struct ioarg *)) e.iop->iofn);
e.iobase = e.iop;
for (;;) {
if (interactive && e.iop <= iostack) {
#if ENABLE_FEATURE_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(char *hname, int xdoll)
{
int hf;
int tf;
#if __GNUC__
/* Avoid longjmp clobbering */
(void) &tf;
#endif
if (hname == NULL)
return -1;
DBGPRINTF7(("HEREIN: hname is %s, xdoll=%d\n", hname, xdoll));
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;
errpt = ev;
if (newenv(setjmp(errpt)) == 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;
}
return hf;
}
static void scraphere(void)
{
struct here *h;
DBGPRINTF7(("SCRAPHERE: enter...\n"));
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(int area)
{
struct here *h, *hl;
DBGPRINTF6(("FREEHERE: enter, area=%d\n", area));
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;
}
/* -------- sh.c -------- */
/*
* shell
*/
int msh_main(int argc, char **argv)
{
int f;
char *s;
int cflag;
char *name, **ap;
int (*iof) (struct ioarg *);
#if ENABLE_FEATURE_EDITING
line_input_state = new_line_input_t(FOR_SHELL);
#endif
DBGPRINTF(("MSH_MAIN: argc %d, environ %p\n", argc, environ));
initarea();
ap = environ;
if (ap != 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, (char *)DEFAULT_SHELL);
export(shell);
homedir = lookup("HOME");
if (homedir->value == null)
setval(homedir, "/");
export(homedir);
setval(lookup("$"), putn(getpid()));
path = lookup("PATH");
if (path->value == null) {
if (geteuid() == 0)
setval(path, "/sbin:/bin:/usr/sbin:/usr/bin");
else
setval(path, "/bin:/usr/bin");
}
export(path);
ifs = lookup("IFS");
if (ifs->value == null)
setval(ifs, " \t\n");
#ifdef MSHDEBUG
mshdbg_var = lookup("MSHDEBUG");
if (mshdbg_var->value == null)
setval(mshdbg_var, "0");
#endif
prompt = lookup("PS1");
#if ENABLE_FEATURE_EDITING_FANCY_PROMPT
if (prompt->value == null)
#endif
setval(prompt, DEFAULT_USER_PROMPT);
if (geteuid() == 0) {
setval(prompt, DEFAULT_ROOT_PROMPT);
prompt->status &= ~EXPORT;
}
cprompt = lookup("PS2");
#if ENABLE_FEATURE_EDITING_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;
/* Shell is non-interactive, activate printf-based debug */
#ifdef MSHDEBUG
mshdbg = (int) (((char) (mshdbg_var->value[0])) - '0');
if (mshdbg < 0)
mshdbg = 0;
#endif
DBGPRINTF(("MSH_MAIN: calling newfile()\n"));
name = *++argv;
if (newfile(name))
exit(1); /* Exit on error */
}
}
setdash();
/* This won't be true if PUSHIO has been called, say from newfile() above */
if (e.iop < iostack) {
PUSHIO(afile, 0, iof);
if (isatty(0) && isatty(1) && !cflag) {
interactive++;
#if !ENABLE_FEATURE_SH_EXTRA_QUIET
#ifdef MSHDEBUG
printf("\n\n%s Built-in shell (msh with debug)\n", BB_BANNER);
#else
printf("\n\n%s Built-in shell (msh)\n", BB_BANNER);
#endif
printf("Enter 'help' for a list of built-in commands.\n\n");
#endif
}
}
signal(SIGQUIT, qflag);
if (name && name[0] == '-') {
interactive++;
f = open(".profile", 0);
if (f >= 0)
next(remap(f));
f = open("/etc/profile", 0);
if (f >= 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;) {
*ap = *argv++;
if (assign(*ap, !COPYV)) {
dolc--; /* keyword */
} else {
ap++;
}
}
}
setval(lookup("#"), putn((--dolc < 0) ? (dolc = 0) : dolc));
DBGPRINTF(("MSH_MAIN: begin FOR loop, interactive %d, e.iop %p, iostack %p\n", interactive, e.iop, iostack));
for (;;) {
if (interactive && e.iop <= iostack) {
#if ENABLE_FEATURE_EDITING
current_prompt = prompt->value;
#else
prs(prompt->value);
#endif
}
onecommand();
/* Ensure that getenv("PATH") stays current */
setenv("PATH", path->value, 1);
}
DBGPRINTF(("MSH_MAIN: returning.\n"));
}
/*
* 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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