bin/csh/csh.h

   1 /* $NetBSD: csh.h,v 1.20 2007/07/16 14:07:00 christos Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1980, 1991, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  *      @(#)csh.h       8.1 (Berkeley) 5/31/93
  32  */
  33
  34 #ifndef _CSH_H_
  35 #define _CSH_H_
  36
  37 /*
  38  * Fundamental definitions which may vary from system to system.
  39  *
  40  *      BUFSIZE         The i/o buffering size; also limits word size
  41  *      MAILINTVL       How often to mailcheck; more often is more expensive
  42  */
  43 #ifndef BUFSIZE
  44 #define BUFSIZE 4096            /* default buffer size */
  45 #endif                          /* BUFSIZE */
  46
  47 #define FORKSLEEP 10            /* delay loop on non-interactive fork failure */
  48 #define MAILINTVL 600           /* 10 minutes */
  49
  50 /*
  51  * The shell moves std in/out/diag and the old std input away from units
  52  * 0, 1, and 2 so that it is easy to set up these standards for invoked
  53  * commands.
  54  */
  55 #define FSHTTY 15               /* /dev/tty when manip pgrps */
  56 #define FSHIN 16                /* Preferred desc for shell input */
  57 #define FSHOUT 17               /* ... shell output */
  58 #define FSHERR 18               /* ... shell diagnostics */
  59 #define FOLDSTD 19              /* ... old std input */
  60
  61 #ifdef PROF
  62 #define xexit(n) done(n)
  63 #endif
  64
  65 #ifdef SHORT_STRINGS
  66 typedef short Char;
  67
  68 #define SAVE(a) (Strsave(str2short(a)))
  69 #else
  70 typedef char Char;
  71
  72 #define SAVE(a) (strsave(a))
  73 #endif
  74
  75 /*
  76  * Make sure a variable is not stored in a register by taking its address
  77  * This is used where variables might be clobbered by longjmp.
  78  */
  79 #define UNREGISTER(a)   (void) &a
  80
  81 typedef void *ioctl_t;          /* Third arg of ioctl */
  82
  83 typedef void *ptr_t;
  84
  85 #include "const.h"
  86 #include "char.h"
  87 #include "errnum.h"
  88
  89 #define xmalloc(i) Malloc(i)
  90 #define xrealloc(p, i) Realloc(p, i)
  91 #define xcalloc(n, s) Calloc(n, s)
  92 #define xfree(p) Free(p)
  93
  94 #include <stdio.h>
  95 FILE *cshin, *cshout, *csherr;
  96
  97 #define isdir(d) (S_ISDIR(d.st_mode))
  98
  99 #define eq(a, b) (Strcmp(a, b) == 0)
 100
 101 /* globone() flags */
 102 #define G_ERROR 0               /* default action: error if multiple words */
 103 #define G_IGNORE 1              /* ignore the rest of the words */
 104 #define G_APPEND 2              /* make a sentence by cat'ing the words */
 105
 106 /*
 107  * Global flags
 108  */
 109 int child;                      /* Child shell ... errors cause exit */
 110 int chkstop;                    /* Warned of stopped jobs... allow exit */
 111 int didfds;                     /* Have setup i/o fd's for child */
 112 int doneinp;                    /* EOF indicator after reset from readc */
 113 int exiterr;                    /* Exit if error or non-zero exit status */
 114 int haderr;                     /* Reset was because of an error */
 115 int havhash;                    /* path hashing is available */
 116 int intact;                     /* We are interactive... therefore prompt */
 117 int intty;                      /* Input is a tty */
 118 int justpr;                     /* Just print because of :p hist mod */
 119 int loginsh;                    /* We are a loginsh -> .login/.logout */
 120 int neednote;                   /* Need to pnotify() */
 121 int noexec;                     /* Don't execute, just syntax check */
 122 int pjobs;                      /* want to print jobs if interrupted */
 123 int setintr;                    /* Set interrupts on/off -> Wait intr... */
 124 int timflg;                     /* Time the next waited for command */
 125
 126 #ifdef FILEC
 127 extern int filec;               /* doing filename expansion */
 128 #endif
 129
 130 /*
 131  * Global i/o info
 132  */
 133 Char *arginp;                   /* Argument input for sh -c and internal `xx` */
 134 Char *ffile;                    /* Name of shell file for $0 */
 135 int onelflg;                    /* 2 -> need line for -t, 1 -> exit on read */
 136
 137 extern char *seterr;            /* Error message from scanner/parser */
 138 Char *shtemp;                   /* Temp name for << shell files in /tmp */
 139
 140 #include <sys/resource.h>
 141 #include <sys/time.h>
 142 #include <sys/types.h>
 143
 144 struct timeval time0;           /* Time at which the shell started */
 145 struct rusage ru0;
 146
 147 /*
 148  * Miscellany
 149  */
 150 time_t chktim;                  /* Time mail last checked */
 151 Char *doldol;                   /* Character pid for $$ */
 152 int backpid;                    /* Pid of the last background process */
 153 int egid, gid;                  /* Invokers gid */
 154 int euid, uid;                  /* Invokers uid */
 155 int shpgrp;                     /* Pgrp of shell */
 156 int tpgrp;                      /* Terminal process group */
 157
 158 /* If tpgrp is -1, leave tty alone! */
 159 int opgrp;                      /* Initial pgrp and tty pgrp */
 160
 161
 162 /*
 163  * To be able to redirect i/o for builtins easily, the shell moves the i/o
 164  * descriptors it uses away from 0,1,2.
 165  * Ideally these should be in units which are closed across exec's
 166  * (this saves work) but for version 6, this is not usually possible.
 167  * The desired initial values for these descriptors are F{SHIN,...}.
 168  */
 169 int SHIN;                       /* Current shell input (script) */
 170 int SHOUT;                      /* Shell output */
 171 int SHERR;                      /* Diagnostic output... shell errs go here */
 172 int OLDSTD;                     /* Old standard input (def for cmds) */
 173
 174 /*
 175  * Error control
 176  *
 177  * Errors in scanning and parsing set up an error message to be printed
 178  * at the end and complete.  Other errors always cause a reset.
 179  * Because of source commands and .cshrc we need nested error catches.
 180  */
 181
 182 #include <setjmp.h>
 183 jmp_buf reslab;
 184
 185 #define setexit() (setjmp(reslab))
 186 #define reset() longjmp(reslab, 1)
 187  /* Should use structure assignment here */
 188 #define getexit(a) (void)memcpy((a), reslab, sizeof reslab)
 189 #define resexit(a) (void)memcpy(reslab, (a), sizeof reslab)
 190
 191 Char *gointr;                   /* Label for an onintr transfer */
 192
 193 #include <signal.h>
 194 sig_t parintr;                  /* Parents interrupt catch */
 195 sig_t parterm;                  /* Parents terminate catch */
 196
 197 /*
 198  * Lexical definitions.
 199  *
 200  * All lexical space is allocated dynamically.
 201  * The eighth/sixteenth bit of characters is used to prevent recognition,
 202  * and eventually stripped.
 203  */
 204 #define META 0200
 205 #define ASCII 0177
 206 #ifdef SHORT_STRINGS
 207 #define CHAR 0377
 208 #define QUOTE 0100000           /* 16nth char bit used for 'ing */
 209 #define TRIM 0077777            /* Mask to strip quote bit */
 210 #else
 211 #define CHAR 0177
 212 #define QUOTE 0200              /* Eighth char bit used for 'ing */
 213 #define TRIM 0177               /* Mask to strip quote bit */
 214 #endif
 215
 216 int AsciiOnly;                  /* If set only 7 bits is expected in characters */
 217
 218 /*
 219  * Each level of input has a buffered input structure.
 220  * There are one or more blocks of buffered input for each level,
 221  * exactly one if the input is seekable and tell is available.
 222  * In other cases, the shell buffers enough blocks to keep all loops
 223  * in the buffer.
 224  */
 225 struct Bin {
 226     off_t Bfseekp;              /* Seek pointer */
 227     off_t Bfbobp;               /* Seekp of beginning of buffers */
 228     off_t Bfeobp;               /* Seekp of end of buffers */
 229     int Bfblocks;               /* Number of buffer blocks */
 230     Char **Bfbuf;               /* The array of buffer blocks */
 231 }       B;
 232
 233 /*
 234  * This structure allows us to seek inside aliases
 235  */
 236 struct Ain {
 237     int type;
 238 #define I_SEEK -1               /* Invalid seek */
 239 #define A_SEEK 0                /* Alias seek */
 240 #define F_SEEK 1                /* File seek */
 241 #define E_SEEK 2                /* Eval seek */
 242     union {
 243         off_t _f_seek;
 244         Char* _c_seek;
 245     } fc;
 246 #define f_seek fc._f_seek
 247 #define c_seek fc._c_seek
 248     Char **a_seek;
 249 } ;
 250 extern int aret;                /* What was the last character returned */
 251 #define SEEKEQ(a, b) ((a)->type == (b)->type && \
 252                       (a)->f_seek == (b)->f_seek && \
 253                       (a)->a_seek == (b)->a_seek)
 254
 255 #define fseekp B.Bfseekp
 256 #define fbobp B.Bfbobp
 257 #define feobp B.Bfeobp
 258 #define fblocks B.Bfblocks
 259 #define fbuf B.Bfbuf
 260
 261 /*
 262  * The shell finds commands in loops by reseeking the input
 263  * For whiles, in particular, it reseeks to the beginning of the
 264  * line the while was on; hence the while placement restrictions.
 265  */
 266 struct Ain lineloc;
 267
 268 int cantell;                    /* Is current source tellable ? */
 269
 270 /*
 271  * Input lines are parsed into doubly linked circular
 272  * lists of words of the following form.
 273  */
 274 struct wordent {
 275     Char *word;
 276     struct wordent *prev;
 277     struct wordent *next;
 278 };
 279
 280 /*
 281  * During word building, both in the initial lexical phase and
 282  * when expanding $ variable substitutions, expansion by `!' and `$'
 283  * must be inhibited when reading ahead in routines which are themselves
 284  * processing `!' and `$' expansion or after characters such as `\' or in
 285  * quotations.  The following flags are passed to the getC routines
 286  * telling them which of these substitutions are appropriate for the
 287  * next character to be returned.
 288  */
 289 #define DODOL 1
 290 #define DOEXCL 2
 291 #define DOALL DODOL|DOEXCL
 292
 293 /*
 294  * Labuf implements a general buffer for lookahead during lexical operations.
 295  * Text which is to be placed in the input stream can be stuck here.
 296  * We stick parsed ahead $ constructs during initial input,
 297  * process id's from `$$', and modified variable values (from qualifiers
 298  * during expansion in sh.dol.c) here.
 299  */
 300 Char *lap;
 301
 302 /*
 303  * Parser structure
 304  *
 305  * Each command is parsed to a tree of command structures and
 306  * flags are set bottom up during this process, to be propagated down
 307  * as needed during the semantics/execution pass (sh.sem.c).
 308  */
 309 struct command {
 310     short t_dtyp;               /* Type of node                  */
 311 #define NODE_COMMAND    1       /* t_dcom <t_dlef >t_drit        */
 312 #define NODE_PAREN      2       /* ( t_dspr ) <t_dlef >t_drit    */
 313 #define NODE_PIPE       3       /* t_dlef | t_drit               */
 314 #define NODE_LIST       4       /* t_dlef ; t_drit               */
 315 #define NODE_OR         5       /* t_dlef || t_drit              */
 316 #define NODE_AND        6       /* t_dlef && t_drit              */
 317     short t_dflg;               /* Flags, e.g. F_AMPERSAND|...   */
 318 #define F_SAVE  (F_NICE|F_TIME|F_NOHUP) /* save these when re-doing      */
 319
 320 #define F_AMPERSAND     (1<<0)  /* executes in background        */
 321 #define F_APPEND        (1<<1)  /* output is redirected >>       */
 322 #define F_PIPEIN        (1<<2)  /* input is a pipe               */
 323 #define F_PIPEOUT       (1<<3)  /* output is a pipe              */
 324 #define F_NOFORK        (1<<4)  /* don't fork, last ()ized cmd   */
 325 #define F_NOINTERRUPT   (1<<5)  /* should be immune from intr's */
 326 /* spare */
 327 #define F_STDERR        (1<<7)  /* redirect unit 2 with unit 1   */
 328 #define F_OVERWRITE     (1<<8)  /* output was !                  */
 329 #define F_READ          (1<<9)  /* input redirection is <<       */
 330 #define F_REPEAT        (1<<10) /* reexec aft if, repeat,...     */
 331 #define F_NICE          (1<<11) /* t_nice is meaningful          */
 332 #define F_NOHUP         (1<<12) /* nohup this command            */
 333 #define F_TIME          (1<<13) /* time this command             */
 334     union {
 335         Char *T_dlef;           /* Input redirect word           */
 336         struct command *T_dcar; /* Left part of list/pipe        */
 337     }       L;
 338     union {
 339         Char *T_drit;           /* Output redirect word          */
 340         struct command *T_dcdr; /* Right part of list/pipe       */
 341     }       R;
 342 #define t_dlef L.T_dlef
 343 #define t_dcar L.T_dcar
 344 #define t_drit R.T_drit
 345 #define t_dcdr R.T_dcdr
 346     Char **t_dcom;              /* Command/argument vector       */
 347     struct command *t_dspr;     /* Pointer to ()'d subtree       */
 348     int t_nice;
 349 };
 350
 351
 352 /*
 353  * These are declared here because they want to be
 354  * initialized in sh.init.c (to allow them to be made readonly)
 355  */
 356
 357 extern struct biltins {
 358     const char *bname;
 359     void (*bfunct)(Char **, struct command *);
 360     short minargs, maxargs;
 361 } bfunc[];
 362
 363 extern int nbfunc;
 364 extern int nsrchn;
 365
 366 extern struct srch {
 367     const char *s_name;
 368     short s_value;
 369 } srchn[];
 370
 371 /*
 372  * The keywords for the parser
 373  */
 374 #define T_BREAK         0
 375 #define T_BRKSW         1
 376 #define T_CASE          2
 377 #define T_DEFAULT       3
 378 #define T_ELSE          4
 379 #define T_END           5
 380 #define T_ENDIF         6
 381 #define T_ENDSW         7
 382 #define T_EXIT          8
 383 #define T_FOREACH       9
 384 #define T_GOTO          10
 385 #define T_IF            11
 386 #define T_LABEL         12
 387 #define T_LET           13
 388 #define T_SET           14
 389 #define T_SWITCH        15
 390 #define T_TEST          16
 391 #define T_THEN          17
 392 #define T_WHILE         18
 393
 394 /*
 395  * Structure defining the existing while/foreach loops at this
 396  * source level.  Loops are implemented by seeking back in the
 397  * input.  For foreach (fe), the word list is attached here.
 398  */
 399 struct whyle {
 400     struct Ain w_start;         /* Point to restart loop */
 401     struct Ain w_end;           /* End of loop (0 if unknown) */
 402     Char **w_fe, **w_fe0;       /* Current/initial wordlist for fe */
 403     Char *w_fename;             /* Name for fe */
 404     struct whyle *w_next;       /* Next (more outer) loop */
 405 } *whyles;
 406
 407 /*
 408  * Variable structure
 409  *
 410  * Aliases and variables are stored in AVL balanced binary trees.
 411  */
 412 struct varent {
 413     Char **vec;                 /* Array of words which is the value */
 414     Char *v_name;               /* Name of variable/alias */
 415     struct varent *v_link[3];   /* The links, see below */
 416     int v_bal;                  /* Balance factor */
 417 } shvhed, aliases;
 418
 419 #define v_left v_link[0]
 420 #define v_right v_link[1]
 421 #define v_parent v_link[2]
 422
 423 #define adrof(v) adrof1(v, &shvhed)
 424 #define value(v) value1(v, &shvhed)
 425
 426 /*
 427  * The following are for interfacing redo substitution in
 428  * aliases to the lexical routines.
 429  */
 430 struct wordent *alhistp;        /* Argument list (first) */
 431 struct wordent *alhistt;        /* Node after last in arg list */
 432 extern Char **alvec, *alvecp;   /* The (remnants of) alias vector */
 433
 434 /*
 435  * Filename/command name expansion variables
 436  */
 437 int gflag;                      /* After tglob -> is globbing needed? */
 438
 439 #define MAXVARLEN 30            /* Maximum number of char in a variable name */
 440
 441 /*
 442  * Variables for filename expansion
 443  */
 444 extern long gargc;              /* Number args in gargv */
 445 extern Char **gargv;            /* Pointer to the (stack) arglist */
 446
 447 /*
 448  * Variables for command expansion.
 449  */
 450 extern Char **pargv;            /* Pointer to the argv list space */
 451 extern long pargc;              /* Count of arguments in pargv */
 452 long pnleft;                    /* Number of chars left in pargs */
 453 Char *pargs;                    /* Pointer to start current word */
 454 Char *pargcp;                   /* Current index into pargs */
 455
 456 /*
 457  * History list
 458  *
 459  * Each history list entry contains an embedded wordlist
 460  * from the scanner, a number for the event, and a reference count
 461  * to aid in discarding old entries.
 462  *
 463  * Essentially "invisible" entries are put on the history list
 464  * when history substitution includes modifiers, and thrown away
 465  * at the next discarding since their event numbers are very negative.
 466  */
 467 struct Hist {
 468     struct wordent Hlex;
 469     int Hnum;
 470     int Href;
 471     struct Hist *Hnext;
 472 } Histlist;
 473
 474 struct wordent paraml;          /* Current lexical word list */
 475 int eventno;                    /* Next events number */
 476 int lastev;                     /* Last event reference (default) */
 477
 478 Char HIST;                      /* history invocation character */
 479 Char HISTSUB;                   /* auto-substitute character */
 480
 481 /*
 482  * strings.h:
 483  */
 484 #ifndef SHORT_STRINGS
 485 #define Strchr(a, b)            strchr(a, b)
 486 #define Strrchr(a, b)           strrchr(a, b)
 487 #define Strcat(a, b)            strcat(a, b)
 488 #define Strncat(a, b, c)        strncat(a, b, c)
 489 #define Strcpy(a, b)            strcpy(a, b)
 490 #define Strncpy(a, b, c)        strncpy(a, b, c)
 491 #define Strlen(a)               strlen(a)
 492 #define Strcmp(a, b)            strcmp(a, b)
 493 #define Strncmp(a, b, c)        strncmp(a, b, c)
 494
 495 #define Strspl(a, b)            strspl(a, b)
 496 #define Strsave(a)              strsave(a)
 497 #define Strend(a)               strend(a)
 498 #define Strstr(a, b)            strstr(a, b)
 499
 500 #define str2short(a)            (a)
 501 #define blk2short(a)            saveblk(a)
 502 #define short2blk(a)            saveblk(a)
 503 #define short2str(a)            strip(a)
 504 #else
 505 #define Strchr(a, b)            s_strchr(a, b)
 506 #define Strrchr(a, b)           s_strrchr(a, b)
 507 #define Strcat(a, b)            s_strcat(a, b)
 508 #define Strncat(a, b, c)        s_strncat(a, b, c)
 509 #define Strcpy(a, b)            s_strcpy(a, b)
 510 #define Strncpy(a, b, c)        s_strncpy(a, b, c)
 511 #define Strlen(a)               s_strlen(a)
 512 #define Strcmp(a, b)            s_strcmp(a, b)
 513 #define Strncmp(a, b, c)        s_strncmp(a, b, c)
 514
 515 #define Strspl(a, b)            s_strspl(a, b)
 516 #define Strsave(a)              s_strsave(a)
 517 #define Strend(a)               s_strend(a)
 518 #define Strstr(a, b)            s_strstr(a, b)
 519 #endif
 520
 521 /*
 522  * setname is a macro to save space (see sh.err.c)
 523  */
 524 const char *bname;
 525
 526 #define setname(a) (bname = (a))
 527
 528 Char *Vsav;
 529 Char *Vdp;
 530 Char *Vexpath;
 531 char **Vt;
 532
 533 Char **evalvec;
 534 Char *evalp;
 535
 536 /* word_chars is set by default to WORD_CHARS but can be overridden by
 537    the worchars variable--if unset, reverts to WORD_CHARS */
 538
 539 Char *word_chars;
 540
 541 #define WORD_CHARS "*?_-.[]~="  /* default chars besides alnums in words */
 542
 543 Char *STR_SHELLPATH;
 544
 545 #include <paths.h>
 546 #ifdef _PATH_BSHELL
 547 Char *STR_BSHELL;
 548 #endif
 549 Char *STR_WORD_CHARS;
 550 Char **STR_environ;
 551
 552 #endif /* !_CSH_H_ */