1: /*
   2:  * Copyright (c) 1980 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley Software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  *
   6:  *	@(#)sh.h	5.3.2 (2.11BSD GTE) 1996/9/20
   7:  */
   8: 
   9: #include <sys/time.h>
  10: #include <sys/resource.h>
  11: #include <sys/param.h>
  12: #include <sys/stat.h>
  13: #include <sys/signal.h>
  14: #include <errno.h>
  15: #include <setjmp.h>
  16: #include "sh.local.h"
  17: #include "sh.char.h"
  18: 
  19: /*
  20:  * C shell
  21:  *
  22:  * Bill Joy, UC Berkeley
  23:  * October, 1978; May 1980
  24:  *
  25:  * Jim Kulp, IIASA, Laxenburg Austria
  26:  * April, 1980
  27:  */
  28: 
  29: typedef char    bool;
  30: 
  31: #define eq(a, b)    (strcmp(a, b) == 0)
  32: 
  33: /*
  34:  * Global flags
  35:  */
  36: bool    chkstop;        /* Warned of stopped jobs... allow exit */
  37: bool    didfds;         /* Have setup i/o fd's for child */
  38: bool    doneinp;        /* EOF indicator after reset from readc */
  39: bool    exiterr;        /* Exit if error or non-zero exit status */
  40: bool    child;          /* Child shell ... errors cause exit */
  41: bool    haderr;         /* Reset was because of an error */
  42: bool    intty;          /* Input is a tty */
  43: bool    intact;         /* We are interactive... therefore prompt */
  44: bool    justpr;         /* Just print because of :p hist mod */
  45: bool    loginsh;        /* We are a loginsh -> .login/.logout */
  46: bool    neednote;       /* Need to pnotify() */
  47: bool    noexec;         /* Don't execute, just syntax check */
  48: bool    pjobs;          /* want to print jobs if interrupted */
  49: bool    setintr;        /* Set interrupts on/off -> Wait intr... */
  50: bool    timflg;         /* Time the next waited for command */
  51: bool    havhash;        /* path hashing is available */
  52: #ifdef FILEC
  53: bool    filec;          /* doing filename expansion */
  54: #endif
  55: 
  56: /*
  57:  * Global i/o info
  58:  */
  59: char    *arginp;        /* Argument input for sh -c and internal `xx` */
  60: int onelflg;        /* 2 -> need line for -t, 1 -> exit on read */
  61: char    *file;          /* Name of shell file for $0 */
  62: 
  63: char    *err;           /* Error message from scanner/parser */
  64: int errno;          /* Error from C library routines */
  65: char    *shtemp;        /* Temp name for << shell files in /tmp */
  66: struct  timeval time0;      /* Time at which the shell started */
  67: struct  rusage ru0;
  68: 
  69: /*
  70:  * Miscellany
  71:  */
  72: char    *doldol;        /* Character pid for $$ */
  73: int uid;            /* Invokers uid */
  74: time_t  chktim;         /* Time mail last checked */
  75: int shpgrp;         /* Pgrp of shell */
  76: int tpgrp;          /* Terminal process group */
  77: /* If tpgrp is -1, leave tty alone! */
  78: int opgrp;          /* Initial pgrp and tty pgrp */
  79: int oldisc;         /* Initial line discipline or -1 */
  80: 
  81: /*
  82:  * These are declared here because they want to be
  83:  * initialized in sh.init.c (to allow them to be made readonly)
  84:  */
  85: 
  86: struct  biltins {
  87:     char    *bname;
  88:     int (*bfunct)();
  89:     short   minargs, maxargs;
  90: } bfunc[];
  91: extern int nbfunc;
  92: 
  93: struct srch {
  94:     char    *s_name;
  95:     short   s_value;
  96: } srchn[];
  97: extern int nsrchn;
  98: 
  99: /*
 100:  * To be able to redirect i/o for builtins easily, the shell moves the i/o
 101:  * descriptors it uses away from 0,1,2.
 102:  * Ideally these should be in units which are closed across exec's
 103:  * (this saves work) but for version 6, this is not usually possible.
 104:  * The desired initial values for these descriptors are defined in
 105:  * sh.local.h.
 106:  */
 107: short   SHIN;           /* Current shell input (script) */
 108: short   SHOUT;          /* Shell output */
 109: short   SHDIAG;         /* Diagnostic output... shell errs go here */
 110: short   OLDSTD;         /* Old standard input (def for cmds) */
 111: 
 112: /*
 113:  * Error control
 114:  *
 115:  * Errors in scanning and parsing set up an error message to be printed
 116:  * at the end and complete.  Other errors always cause a reset.
 117:  * Because of source commands and .cshrc we need nested error catches.
 118:  */
 119: 
 120: jmp_buf reslab;
 121: 
 122: #define setexit()   ((void) setjmp(reslab))
 123: #define reset()     longjmp(reslab, 0)
 124:     /* Should use structure assignment here */
 125: #define getexit(a)  copy((char *)(a), (char *)reslab, sizeof reslab)
 126: #define resexit(a)  copy((char *)reslab, ((char *)(a)), sizeof reslab)
 127: 
 128: char    *gointr;        /* Label for an onintr transfer */
 129: int (*parintr)();       /* Parents interrupt catch */
 130: int (*parterm)();       /* Parents terminate catch */
 131: 
 132: /*
 133:  * Lexical definitions.
 134:  *
 135:  * All lexical space is allocated dynamically.
 136:  * The eighth bit of characters is used to prevent recognition,
 137:  * and eventually stripped.
 138:  */
 139: #define QUOTE   0200        /* Eighth char bit used internally for 'ing */
 140: #define TRIM    0177        /* Mask to strip quote bit */
 141: 
 142: /*
 143:  * Each level of input has a buffered input structure.
 144:  * There are one or more blocks of buffered input for each level,
 145:  * exactly one if the input is seekable and tell is available.
 146:  * In other cases, the shell buffers enough blocks to keep all loops
 147:  * in the buffer.
 148:  */
 149: struct  Bin {
 150:     off_t   Bfseekp;        /* Seek pointer */
 151:     off_t   Bfbobp;         /* Seekp of beginning of buffers */
 152:     off_t   Bfeobp;         /* Seekp of end of buffers */
 153:     short   Bfblocks;       /* Number of buffer blocks */
 154:     char    **Bfbuf;        /* The array of buffer blocks */
 155: } B;
 156: 
 157: #define fseekp  B.Bfseekp
 158: #define fbobp   B.Bfbobp
 159: #define feobp   B.Bfeobp
 160: #define fblocks B.Bfblocks
 161: #define fbuf    B.Bfbuf
 162: 
 163: #define btell() fseekp
 164: 
 165: #ifndef btell
 166: off_t   btell();
 167: #endif
 168: 
 169: /*
 170:  * The shell finds commands in loops by reseeking the input
 171:  * For whiles, in particular, it reseeks to the beginning of the
 172:  * line the while was on; hence the while placement restrictions.
 173:  */
 174: off_t   lineloc;
 175: 
 176: #ifdef  TELL
 177: bool    cantell;            /* Is current source tellable ? */
 178: #endif
 179: 
 180: /*
 181:  * Input lines are parsed into doubly linked circular
 182:  * lists of words of the following form.
 183:  */
 184: struct  wordent {
 185:     char    *word;
 186:     struct  wordent *prev;
 187:     struct  wordent *next;
 188: };
 189: 
 190: /*
 191:  * During word building, both in the initial lexical phase and
 192:  * when expanding $ variable substitutions, expansion by `!' and `$'
 193:  * must be inhibited when reading ahead in routines which are themselves
 194:  * processing `!' and `$' expansion or after characters such as `\' or in
 195:  * quotations.  The following flags are passed to the getC routines
 196:  * telling them which of these substitutions are appropriate for the
 197:  * next character to be returned.
 198:  */
 199: #define DODOL   1
 200: #define DOEXCL  2
 201: #define DOALL   DODOL|DOEXCL
 202: 
 203: /*
 204:  * Labuf implements a general buffer for lookahead during lexical operations.
 205:  * Text which is to be placed in the input stream can be stuck here.
 206:  * We stick parsed ahead $ constructs during initial input,
 207:  * process id's from `$$', and modified variable values (from qualifiers
 208:  * during expansion in sh.dol.c) here.
 209:  */
 210: char    labuf[BUFSIZ];
 211: 
 212: char    *lap;
 213: 
 214: /*
 215:  * Parser structure
 216:  *
 217:  * Each command is parsed to a tree of command structures and
 218:  * flags are set bottom up during this process, to be propagated down
 219:  * as needed during the semantics/exeuction pass (sh.sem.c).
 220:  */
 221: struct  command {
 222:     short   t_dtyp;             /* Type of node */
 223:     short   t_dflg;             /* Flags, e.g. FAND|... */
 224:     union {
 225:         char    *T_dlef;        /* Input redirect word */
 226:         struct  command *T_dcar;    /* Left part of list/pipe */
 227:     } L;
 228:     union {
 229:         char    *T_drit;        /* Output redirect word */
 230:         struct  command *T_dcdr;    /* Right part of list/pipe */
 231:     } R;
 232: #define t_dlef  L.T_dlef
 233: #define t_dcar  L.T_dcar
 234: #define t_drit  R.T_drit
 235: #define t_dcdr  R.T_dcdr
 236:     char    **t_dcom;           /* Command/argument vector */
 237:     struct  command *t_dspr;        /* Pointer to ()'d subtree */
 238:     short   t_nice;
 239: };
 240: 
 241: #define TCOM    1       /* t_dcom <t_dlef >t_drit	*/
 242: #define TPAR    2       /* ( t_dspr ) <t_dlef >t_drit	*/
 243: #define TFIL    3       /* t_dlef | t_drit		*/
 244: #define TLST    4       /* t_dlef ; t_drit		*/
 245: #define TOR 5       /* t_dlef || t_drit		*/
 246: #define TAND    6       /* t_dlef && t_drit		*/
 247: 
 248: #define FSAVE   (FNICE|FTIME|FNOHUP)    /* save these when re-doing */
 249: 
 250: #define FAND    (1<<0)      /* executes in background	*/
 251: #define FCAT    (1<<1)      /* output is redirected >>	*/
 252: #define FPIN    (1<<2)      /* input is a pipe		*/
 253: #define FPOU    (1<<3)      /* output is a pipe		*/
 254: #define FPAR    (1<<4)      /* don't fork, last ()ized cmd	*/
 255: #define FINT    (1<<5)      /* should be immune from intr's */
 256: /* spare */
 257: #define FDIAG   (1<<7)      /* redirect unit 2 with unit 1	*/
 258: #define FANY    (1<<8)      /* output was !			*/
 259: #define FHERE   (1<<9)      /* input redirection is <<	*/
 260: #define FREDO   (1<<10)     /* reexec aft if, repeat,...	*/
 261: #define FNICE   (1<<11)     /* t_nice is meaningful */
 262: #define FNOHUP  (1<<12)     /* nohup this command */
 263: #define FTIME   (1<<13)     /* time this command */
 264: 
 265: /*
 266:  * The keywords for the parser
 267:  */
 268: #define ZBREAK      0
 269: #define ZBRKSW      1
 270: #define ZCASE       2
 271: #define ZDEFAULT    3
 272: #define ZELSE       4
 273: #define ZEND        5
 274: #define ZENDIF      6
 275: #define ZENDSW      7
 276: #define ZEXIT       8
 277: #define ZFOREACH    9
 278: #define ZGOTO       10
 279: #define ZIF     11
 280: #define ZLABEL      12
 281: #define ZLET        13
 282: #define ZSET        14
 283: #define ZSWITCH     15
 284: #define ZTEST       16
 285: #define ZTHEN       17
 286: #define ZWHILE      18
 287: 
 288: /*
 289:  * Structure defining the existing while/foreach loops at this
 290:  * source level.  Loops are implemented by seeking back in the
 291:  * input.  For foreach (fe), the word list is attached here.
 292:  */
 293: struct  whyle {
 294:     off_t   w_start;        /* Point to restart loop */
 295:     off_t   w_end;          /* End of loop (0 if unknown) */
 296:     char    **w_fe, **w_fe0;    /* Current/initial wordlist for fe */
 297:     char    *w_fename;      /* Name for fe */
 298:     struct  whyle *w_next;      /* Next (more outer) loop */
 299: } *whyles;
 300: 
 301: /*
 302:  * Variable structure
 303:  *
 304:  * Aliases and variables are stored in AVL balanced binary trees.
 305:  */
 306: struct  varent {
 307:     char    **vec;      /* Array of words which is the value */
 308:     char    *v_name;    /* Name of variable/alias */
 309:     struct  varent *v_link[3];  /* The links, see below */
 310:     int v_bal;      /* Balance factor */
 311: } shvhed, aliases;
 312: #define v_left      v_link[0]
 313: #define v_right     v_link[1]
 314: #define v_parent    v_link[2]
 315: 
 316: struct varent *adrof1();
 317: #define adrof(v)    adrof1(v, &shvhed)
 318: #define value(v)    value1(v, &shvhed)
 319: 
 320: /*
 321:  * The following are for interfacing redo substitution in
 322:  * aliases to the lexical routines.
 323:  */
 324: struct  wordent *alhistp;       /* Argument list (first) */
 325: struct  wordent *alhistt;       /* Node after last in arg list */
 326: char    **alvec;            /* The (remnants of) alias vector */
 327: 
 328: /*
 329:  * Filename/command name expansion variables
 330:  */
 331: short   gflag;              /* After tglob -> is globbing needed? */
 332: 
 333: /*
 334:  * A reasonable limit on number of arguments would seem to be
 335:  * the maximum number of characters in an arg list / 6.
 336:  */
 337: #ifdef pdp11
 338: #define GAVSIZ  NCARGS / 12
 339: #else
 340: #define GAVSIZ  NCARGS / 6
 341: #endif
 342: 
 343: /*
 344:  * Variables for filename expansion
 345:  */
 346: char    **gargv;            /* Pointer to the (stack) arglist */
 347: short   gargc;              /* Number args in gargv */
 348: short   gnleft;
 349: 
 350: /*
 351:  * Variables for command expansion.
 352:  */
 353: char    **pargv;            /* Pointer to the argv list space */
 354: char    *pargs;             /* Pointer to start current word */
 355: short   pargc;              /* Count of arguments in pargv */
 356: short   pnleft;             /* Number of chars left in pargs */
 357: char    *pargcp;            /* Current index into pargs */
 358: 
 359: /*
 360:  * History list
 361:  *
 362:  * Each history list entry contains an embedded wordlist
 363:  * from the scanner, a number for the event, and a reference count
 364:  * to aid in discarding old entries.
 365:  *
 366:  * Essentially "invisible" entries are put on the history list
 367:  * when history substitution includes modifiers, and thrown away
 368:  * at the next discarding since their event numbers are very negative.
 369:  */
 370: struct  Hist {
 371:     struct  wordent Hlex;
 372:     int Hnum;
 373:     int Href;
 374:     struct  Hist *Hnext;
 375: } Histlist;
 376: 
 377: struct  wordent paraml;         /* Current lexical word list */
 378: int eventno;            /* Next events number */
 379: int lastev;             /* Last event reference (default) */
 380: 
 381: char    HIST;               /* history invocation character */
 382: char    HISTSUB;            /* auto-substitute character */
 383: 
 384: /*
 385:  * In lines for frequently called functions
 386:  */
 387: #define XFREE(cp) { \
 388:     extern char end[]; \
 389:     char stack; \
 390:     if ((cp) >= end && (cp) < &stack) \
 391:         free(cp); \
 392: }
 393: char    *alloctmp;
 394: #define xalloc(i) ((alloctmp = malloc(i)) ? alloctmp : (char *)nomem(i))
 395: 
 396: char    *Dfix1();
 397: char    **blkcat();
 398: char    **blkcpy();
 399: char    **blkend();
 400: char    **blkspl();
 401: char    *calloc();
 402: char    *malloc();
 403: char    *cname();
 404: char    **copyblk();
 405: char    **dobackp();
 406: char    *domod();
 407: struct  wordent *dosub();
 408: char    *exp3();
 409: char    *exp3a();
 410: char    *exp4();
 411: char    *exp5();
 412: char    *exp6();
 413: struct  Hist *enthist();
 414: struct  Hist *findev();
 415: struct  wordent *freenod();
 416: char    *getenv();
 417: char    *getinx();
 418: struct  varent *getvx();
 419: struct  passwd *getpwnam();
 420: struct  wordent *gethent();
 421: struct  wordent *getsub();
 422: char    *getwd();
 423: char    **glob();
 424: char    *globone();
 425: char    *index();
 426: struct  biltins *isbfunc();
 427: off_t   lseek();
 428: char    *operate();
 429: int phup();
 430: int pintr();
 431: int pchild();
 432: char    *putn();
 433: char    *rindex();
 434: char    **saveblk();
 435: char    *savestr();
 436: char    *strcat();
 437: char    *strcpy();
 438: char    *strend();
 439: char    *strings();
 440: char    *strip();
 441: char    *strspl();
 442: char    *subword();
 443: struct  command *syntax();
 444: struct  command *syn0();
 445: struct  command *syn1();
 446: struct  command *syn1a();
 447: struct  command *syn1b();
 448: struct  command *syn2();
 449: struct  command *syn3();
 450: char    *value1();
 451: char    *xhome();
 452: char    *xname();
 453: char    *xset();
 454: 
 455: #define NOSTR   ((char *) 0)
 456: 
 457: /*
 458:  * setname is a macro to save space (see sh.err.c)
 459:  */
 460: char    *bname;
 461: #define setname(a)  (bname = (a))
 462: 
 463: #ifdef VFORK
 464: char    *Vsav;
 465: char    **Vav;
 466: char    *Vdp;
 467: #endif
 468: 
 469: char    **evalvec;
 470: char    *evalp;
 471: 
 472: struct  mesg {
 473:     char    *iname;     /* name from /usr/include */
 474:     char    *pname;     /* print name */
 475: } mesg[];

Defined variables

B defined in line 155; used 8 times
HIST defined in line 381; used 15 times
HISTSUB defined in line 382; used 7 times
Histlist defined in line 375; used 6 times
Vav defined in line 465; used 5 times
Vdp defined in line 466; used 5 times
Vsav defined in line 464; used 5 times
alhistp defined in line 324; used 8 times
alhistt defined in line 325; used 3 times
alloctmp defined in line 393; used 2 times
  • in line 394(2)
alvec defined in line 326; used 7 times
arginp defined in line 59; used 12 times
bfunc defined in line 90; used 4 times
bname defined in line 460; used 11 times
cantell defined in line 177; used 7 times
chktim defined in line 74; never used
doldol defined in line 72; used 3 times
doneinp defined in line 38; used 6 times
evalp defined in line 470; used 11 times
evalvec defined in line 469; used 14 times
eventno defined in line 378; used 8 times
file defined in line 61; used 7 times
filec defined in line 53; used 4 times
gargc defined in line 347; used 10 times
gargv defined in line 346; used 34 times
gflag defined in line 331; used 19 times
gnleft defined in line 348; used 3 times
gointr defined in line 128; used 16 times
havhash defined in line 51; used 7 times
intact defined in line 43; used 3 times
intty defined in line 42; used 22 times
justpr defined in line 44; used 3 times
labuf defined in line 210; used 4 times
lap defined in line 212; used 12 times
lastev defined in line 379; used 6 times
lineloc defined in line 174; used 1 times
mesg defined in line 475; used 4 times
neednote defined in line 46; used 3 times
noexec defined in line 47; used 6 times
oldisc defined in line 79; used 9 times
onelflg defined in line 60; used 13 times
opgrp defined in line 78; used 5 times
paraml defined in line 377; used 24 times
pargc defined in line 355; used 6 times
pargcp defined in line 357; used 4 times
pargs defined in line 354; used 4 times
pargv defined in line 353; used 25 times
pjobs defined in line 48; used 4 times
pnleft defined in line 356; used 3 times
reslab defined in line 120; used 6 times
ru0 defined in line 67; used 3 times
shpgrp defined in line 75; used 9 times
shtemp defined in line 65; used 7 times
shvhed defined in line 311; used 11 times
srchn defined in line 96; used 2 times
time0 defined in line 66; used 3 times
timflg defined in line 50; used 2 times
uid defined in line 73; used 5 times
whyles defined in line 299; used 34 times

Defined struct's

Bin defined in line 149; used 2 times
Hist defined in line 370; used 26 times
biltins defined in line 86; used 20 times
command defined in line 221; used 102 times
mesg defined in line 472; never used
srch defined in line 93; used 2 times
varent defined in line 306; used 88 times
whyle defined in line 293; used 20 times
wordent defined in line 184; used 144 times

Defined typedef's

Defined macros

DOALL defined in line 201; used 5 times
DODOL defined in line 199; used 7 times
DOEXCL defined in line 200; used 13 times
FAND defined in line 250; used 13 times
FANY defined in line 258; used 2 times
FCAT defined in line 251; used 4 times
FINT defined in line 255; used 14 times
FNICE defined in line 261; used 6 times
FNOHUP defined in line 262; used 5 times
FPIN defined in line 252; used 5 times
FPOU defined in line 253; used 9 times
FREDO defined in line 260; used 5 times
FSAVE defined in line 248; used 1 times
FTIME defined in line 263; used 4 times
GAVSIZ defined in line 340; used 5 times
TAND defined in line 246; used 3 times
TFIL defined in line 243; used 1 times
TLST defined in line 244; used 3 times
TOR defined in line 245; used 2 times
TPAR defined in line 242; used 4 times
XFREE defined in line 387; used 18 times
ZBREAK defined in line 268; used 5 times
ZBRKSW defined in line 269; used 3 times
ZCASE defined in line 270; never used
ZDEFAULT defined in line 271; never used
ZELSE defined in line 272; used 3 times
ZEND defined in line 273; never used
ZENDIF defined in line 274; never used
ZENDSW defined in line 275; never used
ZEXIT defined in line 276; never used
ZFOREACH defined in line 277; never used
ZGOTO defined in line 278; used 6 times
ZIF defined in line 279; used 4 times
ZLABEL defined in line 280; never used
ZLET defined in line 281; never used
ZSET defined in line 282; never used
ZSWITCH defined in line 283; used 7 times
ZTEST defined in line 284; never used
ZTHEN defined in line 285; never used
ZWHILE defined in line 286; never used
btell defined in line 163; used 10 times
fblocks defined in line 160; used 9 times
fbobp defined in line 158; used 5 times
fbuf defined in line 161; used 19 times
feobp defined in line 159; used 16 times
fseekp defined in line 157; used 22 times
getexit defined in line 125; used 4 times
resexit defined in line 126; used 6 times
setexit defined in line 122; used 5 times
v_left defined in line 312; used 23 times
v_parent defined in line 314; used 14 times
v_right defined in line 313; used 23 times

Usage of this include

Last modified: 1996-09-20
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