1 /*- 2 * Copyright (c) 1980, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)csh.h 8.2 (Berkeley) 04/29/95 8 */ 9 10 /* 11 * Fundamental definitions which may vary from system to system. 12 * 13 * BUFSIZ The i/o buffering size; also limits word size 14 * MAILINTVL How often to mailcheck; more often is more expensive 15 */ 16 #ifndef BUFSIZ 17 #define BUFSIZ 1024 /* default buffer size */ 18 #endif /* BUFSIZ */ 19 20 #define FORKSLEEP 10 /* delay loop on non-interactive fork failure */ 21 #define MAILINTVL 600 /* 10 minutes */ 22 23 /* 24 * The shell moves std in/out/diag and the old std input away from units 25 * 0, 1, and 2 so that it is easy to set up these standards for invoked 26 * commands. 27 */ 28 #define FSHTTY 15 /* /dev/tty when manip pgrps */ 29 #define FSHIN 16 /* Preferred desc for shell input */ 30 #define FSHOUT 17 /* ... shell output */ 31 #define FSHERR 18 /* ... shell diagnostics */ 32 #define FOLDSTD 19 /* ... old std input */ 33 34 #ifdef PROF 35 #define xexit(n) done(n) 36 #endif 37 38 #ifdef SHORT_STRINGS 39 typedef short Char; 40 41 #define SAVE(a) (Strsave(str2short(a))) 42 #else 43 typedef char Char; 44 45 #define SAVE(a) (strsave(a)) 46 #endif 47 48 /* 49 * Make sure a variable is not stored in a register by taking its address 50 * This is used where variables might be clobbered by longjmp. 51 */ 52 #define UNREGISTER(a) (void) &a 53 54 typedef void *ioctl_t; /* Third arg of ioctl */ 55 56 typedef void *ptr_t; 57 58 #include "const.h" 59 #include "char.h" 60 #include "err.h" 61 62 #define xmalloc(i) Malloc(i) 63 #define xrealloc(p, i) Realloc(p, i) 64 #define xcalloc(n, s) Calloc(n, s) 65 #define xfree(p) Free(p) 66 67 #include <stdio.h> 68 FILE *cshin, *cshout, *csherr; 69 70 #define isdir(d) ((d.st_mode & S_IFMT) == S_IFDIR) 71 72 typedef int bool; 73 74 #define eq(a, b) (Strcmp(a, b) == 0) 75 76 /* globone() flags */ 77 #define G_ERROR 0 /* default action: error if multiple words */ 78 #define G_IGNORE 1 /* ignore the rest of the words */ 79 #define G_APPEND 2 /* make a sentence by cat'ing the words */ 80 81 /* 82 * Global flags 83 */ 84 bool chkstop; /* Warned of stopped jobs... allow exit */ 85 bool didfds; /* Have setup i/o fd's for child */ 86 bool doneinp; /* EOF indicator after reset from readc */ 87 bool exiterr; /* Exit if error or non-zero exit status */ 88 bool child; /* Child shell ... errors cause exit */ 89 bool haderr; /* Reset was because of an error */ 90 bool intty; /* Input is a tty */ 91 bool intact; /* We are interactive... therefore prompt */ 92 bool justpr; /* Just print because of :p hist mod */ 93 bool loginsh; /* We are a loginsh -> .login/.logout */ 94 bool neednote; /* Need to pnotify() */ 95 bool noexec; /* Don't execute, just syntax check */ 96 bool pjobs; /* want to print jobs if interrupted */ 97 bool setintr; /* Set interrupts on/off -> Wait intr... */ 98 bool timflg; /* Time the next waited for command */ 99 bool havhash; /* path hashing is available */ 100 101 #ifdef FILEC 102 bool filec; /* doing filename expansion */ 103 #endif 104 105 /* 106 * Global i/o info 107 */ 108 Char *arginp; /* Argument input for sh -c and internal `xx` */ 109 int onelflg; /* 2 -> need line for -t, 1 -> exit on read */ 110 Char *ffile; /* Name of shell file for $0 */ 111 112 char *seterr; /* Error message from scanner/parser */ 113 Char *shtemp; /* Temp name for << shell files in /tmp */ 114 115 #include <sys/types.h> 116 #include <sys/time.h> 117 #include <sys/resource.h> 118 119 struct timeval time0; /* Time at which the shell started */ 120 struct rusage ru0; 121 122 /* 123 * Miscellany 124 */ 125 Char *doldol; /* Character pid for $$ */ 126 int backpid; /* Pid of the last background process */ 127 int uid, euid; /* Invokers uid */ 128 int gid, egid; /* Invokers gid */ 129 time_t chktim; /* Time mail last checked */ 130 int shpgrp; /* Pgrp of shell */ 131 int tpgrp; /* Terminal process group */ 132 133 /* If tpgrp is -1, leave tty alone! */ 134 int opgrp; /* Initial pgrp and tty pgrp */ 135 136 137 /* 138 * To be able to redirect i/o for builtins easily, the shell moves the i/o 139 * descriptors it uses away from 0,1,2. 140 * Ideally these should be in units which are closed across exec's 141 * (this saves work) but for version 6, this is not usually possible. 142 * The desired initial values for these descriptors are F{SHIN,...}. 143 */ 144 int SHIN; /* Current shell input (script) */ 145 int SHOUT; /* Shell output */ 146 int SHERR; /* Diagnostic output... shell errs go here */ 147 int OLDSTD; /* Old standard input (def for cmds) */ 148 149 /* 150 * Error control 151 * 152 * Errors in scanning and parsing set up an error message to be printed 153 * at the end and complete. Other errors always cause a reset. 154 * Because of source commands and .cshrc we need nested error catches. 155 */ 156 157 #include <setjmp.h> 158 jmp_buf reslab; 159 160 #define setexit() (setjmp(reslab)) 161 #define reset() longjmp(reslab, 1) 162 /* Should use structure assignment here */ 163 #define getexit(a) memmove((a), reslab, sizeof reslab) 164 #define resexit(a) memmove(reslab, (a), sizeof reslab) 165 166 Char *gointr; /* Label for an onintr transfer */ 167 168 #include <signal.h> 169 sig_t parintr; /* Parents interrupt catch */ 170 sig_t parterm; /* Parents terminate catch */ 171 172 /* 173 * Lexical definitions. 174 * 175 * All lexical space is allocated dynamically. 176 * The eighth/sixteenth bit of characters is used to prevent recognition, 177 * and eventually stripped. 178 */ 179 #define META 0200 180 #define ASCII 0177 181 #ifdef SHORT_STRINGS 182 #define CHAR 0377 183 #define QUOTE 0100000 /* 16nth char bit used for 'ing */ 184 #define TRIM 0077777 /* Mask to strip quote bit */ 185 #else 186 #define CHAR 0177 187 #define QUOTE 0200 /* Eighth char bit used for 'ing */ 188 #define TRIM 0177 /* Mask to strip quote bit */ 189 #endif 190 191 int AsciiOnly; /* If set only 7 bits is expected in characters */ 192 193 /* 194 * Each level of input has a buffered input structure. 195 * There are one or more blocks of buffered input for each level, 196 * exactly one if the input is seekable and tell is available. 197 * In other cases, the shell buffers enough blocks to keep all loops 198 * in the buffer. 199 */ 200 struct Bin { 201 off_t Bfseekp; /* Seek pointer */ 202 off_t Bfbobp; /* Seekp of beginning of buffers */ 203 off_t Bfeobp; /* Seekp of end of buffers */ 204 int Bfblocks; /* Number of buffer blocks */ 205 Char **Bfbuf; /* The array of buffer blocks */ 206 } B; 207 208 /* 209 * This structure allows us to seek inside aliases 210 */ 211 struct Ain { 212 int type; 213 #define I_SEEK -1 /* Invalid seek */ 214 #define A_SEEK 0 /* Alias seek */ 215 #define F_SEEK 1 /* File seek */ 216 #define E_SEEK 2 /* Eval seek */ 217 union { 218 off_t _f_seek; 219 Char* _c_seek; 220 } fc; 221 #define f_seek fc._f_seek 222 #define c_seek fc._c_seek 223 Char **a_seek; 224 } ; 225 extern int aret; /* What was the last character returned */ 226 #define SEEKEQ(a, b) ((a)->type == (b)->type && \ 227 (a)->f_seek == (b)->f_seek && \ 228 (a)->a_seek == (b)->a_seek) 229 230 #define fseekp B.Bfseekp 231 #define fbobp B.Bfbobp 232 #define feobp B.Bfeobp 233 #define fblocks B.Bfblocks 234 #define fbuf B.Bfbuf 235 236 /* 237 * The shell finds commands in loops by reseeking the input 238 * For whiles, in particular, it reseeks to the beginning of the 239 * line the while was on; hence the while placement restrictions. 240 */ 241 struct Ain lineloc; 242 243 bool cantell; /* Is current source tellable ? */ 244 245 /* 246 * Input lines are parsed into doubly linked circular 247 * lists of words of the following form. 248 */ 249 struct wordent { 250 Char *word; 251 struct wordent *prev; 252 struct wordent *next; 253 }; 254 255 /* 256 * During word building, both in the initial lexical phase and 257 * when expanding $ variable substitutions, expansion by `!' and `$' 258 * must be inhibited when reading ahead in routines which are themselves 259 * processing `!' and `$' expansion or after characters such as `\' or in 260 * quotations. The following flags are passed to the getC routines 261 * telling them which of these substitutions are appropriate for the 262 * next character to be returned. 263 */ 264 #define DODOL 1 265 #define DOEXCL 2 266 #define DOALL DODOL|DOEXCL 267 268 /* 269 * Labuf implements a general buffer for lookahead during lexical operations. 270 * Text which is to be placed in the input stream can be stuck here. 271 * We stick parsed ahead $ constructs during initial input, 272 * process id's from `$$', and modified variable values (from qualifiers 273 * during expansion in sh.dol.c) here. 274 */ 275 Char *lap; 276 277 /* 278 * Parser structure 279 * 280 * Each command is parsed to a tree of command structures and 281 * flags are set bottom up during this process, to be propagated down 282 * as needed during the semantics/exeuction pass (sh.sem.c). 283 */ 284 struct command { 285 short t_dtyp; /* Type of node */ 286 #define NODE_COMMAND 1 /* t_dcom <t_dlef >t_drit */ 287 #define NODE_PAREN 2 /* ( t_dspr ) <t_dlef >t_drit */ 288 #define NODE_PIPE 3 /* t_dlef | t_drit */ 289 #define NODE_LIST 4 /* t_dlef ; t_drit */ 290 #define NODE_OR 5 /* t_dlef || t_drit */ 291 #define NODE_AND 6 /* t_dlef && t_drit */ 292 short t_dflg; /* Flags, e.g. F_AMPERSAND|... */ 293 #define F_SAVE (F_NICE|F_TIME|F_NOHUP) /* save these when re-doing */ 294 295 #define F_AMPERSAND (1<<0) /* executes in background */ 296 #define F_APPEND (1<<1) /* output is redirected >> */ 297 #define F_PIPEIN (1<<2) /* input is a pipe */ 298 #define F_PIPEOUT (1<<3) /* output is a pipe */ 299 #define F_NOFORK (1<<4) /* don't fork, last ()ized cmd */ 300 #define F_NOINTERRUPT (1<<5) /* should be immune from intr's */ 301 /* spare */ 302 #define F_STDERR (1<<7) /* redirect unit 2 with unit 1 */ 303 #define F_OVERWRITE (1<<8) /* output was ! */ 304 #define F_READ (1<<9) /* input redirection is << */ 305 #define F_REPEAT (1<<10) /* reexec aft if, repeat,... */ 306 #define F_NICE (1<<11) /* t_nice is meaningful */ 307 #define F_NOHUP (1<<12) /* nohup this command */ 308 #define F_TIME (1<<13) /* time this command */ 309 union { 310 Char *T_dlef; /* Input redirect word */ 311 struct command *T_dcar; /* Left part of list/pipe */ 312 } L; 313 union { 314 Char *T_drit; /* Output redirect word */ 315 struct command *T_dcdr; /* Right part of list/pipe */ 316 } R; 317 #define t_dlef L.T_dlef 318 #define t_dcar L.T_dcar 319 #define t_drit R.T_drit 320 #define t_dcdr R.T_dcdr 321 Char **t_dcom; /* Command/argument vector */ 322 struct command *t_dspr; /* Pointer to ()'d subtree */ 323 int t_nice; 324 }; 325 326 327 /* 328 * These are declared here because they want to be 329 * initialized in sh.init.c (to allow them to be made readonly) 330 */ 331 332 extern struct biltins { 333 char *bname; 334 void (*bfunct) __P((Char **, struct command *)); 335 short minargs, maxargs; 336 } bfunc[]; 337 extern int nbfunc; 338 339 extern struct srch { 340 char *s_name; 341 short s_value; 342 } srchn[]; 343 extern int nsrchn; 344 345 /* 346 * The keywords for the parser 347 */ 348 #define T_BREAK 0 349 #define T_BRKSW 1 350 #define T_CASE 2 351 #define T_DEFAULT 3 352 #define T_ELSE 4 353 #define T_END 5 354 #define T_ENDIF 6 355 #define T_ENDSW 7 356 #define T_EXIT 8 357 #define T_FOREACH 9 358 #define T_GOTO 10 359 #define T_IF 11 360 #define T_LABEL 12 361 #define T_LET 13 362 #define T_SET 14 363 #define T_SWITCH 15 364 #define T_TEST 16 365 #define T_THEN 17 366 #define T_WHILE 18 367 368 /* 369 * Structure defining the existing while/foreach loops at this 370 * source level. Loops are implemented by seeking back in the 371 * input. For foreach (fe), the word list is attached here. 372 */ 373 struct whyle { 374 struct Ain w_start; /* Point to restart loop */ 375 struct Ain w_end; /* End of loop (0 if unknown) */ 376 Char **w_fe, **w_fe0; /* Current/initial wordlist for fe */ 377 Char *w_fename; /* Name for fe */ 378 struct whyle *w_next; /* Next (more outer) loop */ 379 } *whyles; 380 381 /* 382 * Variable structure 383 * 384 * Aliases and variables are stored in AVL balanced binary trees. 385 */ 386 struct varent { 387 Char **vec; /* Array of words which is the value */ 388 Char *v_name; /* Name of variable/alias */ 389 struct varent *v_link[3]; /* The links, see below */ 390 int v_bal; /* Balance factor */ 391 } shvhed, aliases; 392 393 #define v_left v_link[0] 394 #define v_right v_link[1] 395 #define v_parent v_link[2] 396 397 struct varent *adrof1(); 398 399 #define adrof(v) adrof1(v, &shvhed) 400 #define value(v) value1(v, &shvhed) 401 402 /* 403 * The following are for interfacing redo substitution in 404 * aliases to the lexical routines. 405 */ 406 struct wordent *alhistp; /* Argument list (first) */ 407 struct wordent *alhistt; /* Node after last in arg list */ 408 Char **alvec, *alvecp; /* The (remnants of) alias vector */ 409 410 /* 411 * Filename/command name expansion variables 412 */ 413 int gflag; /* After tglob -> is globbing needed? */ 414 415 #define MAXVARLEN 30 /* Maximum number of char in a variable name */ 416 417 /* 418 * Variables for filename expansion 419 */ 420 extern Char **gargv; /* Pointer to the (stack) arglist */ 421 extern long gargc; /* Number args in gargv */ 422 423 /* 424 * Variables for command expansion. 425 */ 426 extern Char **pargv; /* Pointer to the argv list space */ 427 extern long pargc; /* Count of arguments in pargv */ 428 Char *pargs; /* Pointer to start current word */ 429 long pnleft; /* Number of chars left in pargs */ 430 Char *pargcp; /* Current index into pargs */ 431 432 /* 433 * History list 434 * 435 * Each history list entry contains an embedded wordlist 436 * from the scanner, a number for the event, and a reference count 437 * to aid in discarding old entries. 438 * 439 * Essentially "invisible" entries are put on the history list 440 * when history substitution includes modifiers, and thrown away 441 * at the next discarding since their event numbers are very negative. 442 */ 443 struct Hist { 444 struct wordent Hlex; 445 int Hnum; 446 int Href; 447 struct Hist *Hnext; 448 } Histlist; 449 450 struct wordent paraml; /* Current lexical word list */ 451 int eventno; /* Next events number */ 452 int lastev; /* Last event reference (default) */ 453 454 Char HIST; /* history invocation character */ 455 Char HISTSUB; /* auto-substitute character */ 456 457 /* 458 * strings.h: 459 */ 460 #ifndef SHORT_STRINGS 461 #define Strchr(a, b) strchr(a, b) 462 #define Strrchr(a, b) strrchr(a, b) 463 #define Strcat(a, b) strcat(a, b) 464 #define Strncat(a, b, c) strncat(a, b, c) 465 #define Strcpy(a, b) strcpy(a, b) 466 #define Strncpy(a, b, c) strncpy(a, b, c) 467 #define Strlen(a) strlen(a) 468 #define Strcmp(a, b) strcmp(a, b) 469 #define Strncmp(a, b, c) strncmp(a, b, c) 470 471 #define Strspl(a, b) strspl(a, b) 472 #define Strsave(a) strsave(a) 473 #define Strend(a) strend(a) 474 #define Strstr(a, b) strstr(a, b) 475 476 #define str2short(a) (a) 477 #define blk2short(a) saveblk(a) 478 #define short2blk(a) saveblk(a) 479 #define short2str(a) strip(a) 480 #else 481 #define Strchr(a, b) s_strchr(a, b) 482 #define Strrchr(a, b) s_strrchr(a, b) 483 #define Strcat(a, b) s_strcat(a, b) 484 #define Strncat(a, b, c) s_strncat(a, b, c) 485 #define Strcpy(a, b) s_strcpy(a, b) 486 #define Strncpy(a, b, c) s_strncpy(a, b, c) 487 #define Strlen(a) s_strlen(a) 488 #define Strcmp(a, b) s_strcmp(a, b) 489 #define Strncmp(a, b, c) s_strncmp(a, b, c) 490 491 #define Strspl(a, b) s_strspl(a, b) 492 #define Strsave(a) s_strsave(a) 493 #define Strend(a) s_strend(a) 494 #define Strstr(a, b) s_strstr(a, b) 495 #endif 496 497 /* 498 * setname is a macro to save space (see sh.err.c) 499 */ 500 char *bname; 501 502 #define setname(a) (bname = (a)) 503 504 Char *Vsav; 505 Char *Vdp; 506 Char *Vexpath; 507 char **Vt; 508 509 Char **evalvec; 510 Char *evalp; 511 512 /* word_chars is set by default to WORD_CHARS but can be overridden by 513 the worchars variable--if unset, reverts to WORD_CHARS */ 514 515 Char *word_chars; 516 517 #define WORD_CHARS "*?_-.[]~=" /* default chars besides alnums in words */ 518 519 Char *STR_SHELLPATH; 520 521 #include <paths.h> 522 #ifdef _PATH_BSHELL 523 Char *STR_BSHELL; 524 #endif 525 Char *STR_WORD_CHARS; 526 Char **STR_environ; 527