csh.h revision 1.1
1 /*- 2 * Copyright (c) 1980, 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)csh.h 5.15 (Berkeley) 6/8/91 34 */ 35 36 /* 37 * Fundamental definitions which may vary from system to system. 38 * 39 * BUFSIZ The i/o buffering size; also limits word size 40 * MAILINTVL How often to mailcheck; more often is more expensive 41 */ 42 #ifndef BUFSIZ 43 #define BUFSIZ 1024 /* default buffer size */ 44 #endif /* BUFSIZ */ 45 46 #define FORKSLEEP 10 /* delay loop on non-interactive fork failure */ 47 #define MAILINTVL 600 /* 10 minutes */ 48 49 /* 50 * The shell moves std in/out/diag and the old std input away from units 51 * 0, 1, and 2 so that it is easy to set up these standards for invoked 52 * commands. 53 */ 54 #define FSHTTY 15 /* /dev/tty when manip pgrps */ 55 #define FSHIN 16 /* Preferred desc for shell input */ 56 #define FSHOUT 17 /* ... shell output */ 57 #define FSHDIAG 18 /* ... shell diagnostics */ 58 #define FOLDSTD 19 /* ... old std input */ 59 60 #ifdef PROF 61 #define xexit(n) done(n) 62 #endif 63 64 #ifdef SHORT_STRINGS 65 typedef short Char; 66 67 #define SAVE(a) (Strsave(str2short(a))) 68 #else 69 typedef char Char; 70 71 #define SAVE(a) (strsave(a)) 72 #endif 73 74 typedef void *ioctl_t; /* Third arg of ioctl */ 75 76 typedef void *ptr_t; 77 78 #include "const.h" 79 #include "char.h" 80 #include "err.h" 81 82 #ifdef SYSMALLOC 83 #define xmalloc(i) Malloc(i) 84 #define xrealloc(p, i) Realloc(p, i) 85 #define xcalloc(n, s) Calloc(n, s) 86 #define xfree(p) Free(p) 87 #else 88 #define xmalloc(i) malloc(i) 89 #define xrealloc(p, i) realloc(p, i) 90 #define xcalloc(n, s) calloc(n, s) 91 #define xfree(p) free(p) 92 #endif /* SYSMALLOC */ 93 94 #define isdir(d) ((d.st_mode & S_IFMT) == S_IFDIR) 95 96 #define SIGN_EXTEND_CHAR(a) \ 97 ((a) & 0x80 ? ((int) (a)) | 0xffffff00 : ((int) a) & 0x000000ff) 98 99 100 typedef int bool; 101 102 #define eq(a, b) (Strcmp(a, b) == 0) 103 104 /* globone() flags */ 105 #define G_ERROR 0 /* default action: error if multiple words */ 106 #define G_IGNORE 1 /* ignore the rest of the words */ 107 #define G_APPEND 2 /* make a sentence by cat'ing the words */ 108 109 /* 110 * Global flags 111 */ 112 bool chkstop; /* Warned of stopped jobs... allow exit */ 113 bool didfds; /* Have setup i/o fd's for child */ 114 bool doneinp; /* EOF indicator after reset from readc */ 115 bool exiterr; /* Exit if error or non-zero exit status */ 116 bool child; /* Child shell ... errors cause exit */ 117 bool haderr; /* Reset was because of an error */ 118 bool intty; /* Input is a tty */ 119 bool intact; /* We are interactive... therefore prompt */ 120 bool justpr; /* Just print because of :p hist mod */ 121 bool loginsh; /* We are a loginsh -> .login/.logout */ 122 bool neednote; /* Need to pnotify() */ 123 bool noexec; /* Don't execute, just syntax check */ 124 bool pjobs; /* want to print jobs if interrupted */ 125 bool setintr; /* Set interrupts on/off -> Wait intr... */ 126 bool timflg; /* Time the next waited for command */ 127 bool havhash; /* path hashing is available */ 128 129 #ifdef FILEC 130 bool filec; /* doing filename expansion */ 131 #endif 132 133 /* 134 * Global i/o info 135 */ 136 Char *arginp; /* Argument input for sh -c and internal `xx` */ 137 int onelflg; /* 2 -> need line for -t, 1 -> exit on read */ 138 Char *ffile; /* Name of shell file for $0 */ 139 140 char *seterr; /* Error message from scanner/parser */ 141 Char *shtemp; /* Temp name for << shell files in /tmp */ 142 143 #include <sys/time.h> 144 #include <sys/resource.h> 145 146 struct timeval time0; /* Time at which the shell started */ 147 struct rusage ru0; 148 149 /* 150 * Miscellany 151 */ 152 Char *doldol; /* Character pid for $$ */ 153 int uid; /* Invokers uid */ 154 int gid; /* Invokers gid */ 155 time_t chktim; /* Time mail last checked */ 156 int shpgrp; /* Pgrp of shell */ 157 int tpgrp; /* Terminal process group */ 158 159 /* If tpgrp is -1, leave tty alone! */ 160 int opgrp; /* Initial pgrp and tty pgrp */ 161 162 /* 163 * These are declared here because they want to be 164 * initialized in sh.init.c (to allow them to be made readonly) 165 */ 166 167 extern struct biltins { 168 char *bname; 169 void (*bfunct) (); 170 short minargs, maxargs; 171 } bfunc[]; 172 extern int nbfunc; 173 174 extern struct srch { 175 char *s_name; 176 short s_value; 177 } srchn[]; 178 extern int nsrchn; 179 180 /* 181 * To be able to redirect i/o for builtins easily, the shell moves the i/o 182 * descriptors it uses away from 0,1,2. 183 * Ideally these should be in units which are closed across exec's 184 * (this saves work) but for version 6, this is not usually possible. 185 * The desired initial values for these descriptors are defined in 186 * local.h. 187 */ 188 short SHIN; /* Current shell input (script) */ 189 short SHOUT; /* Shell output */ 190 short SHDIAG; /* Diagnostic output... shell errs go here */ 191 short OLDSTD; /* Old standard input (def for cmds) */ 192 193 /* 194 * Error control 195 * 196 * Errors in scanning and parsing set up an error message to be printed 197 * at the end and complete. Other errors always cause a reset. 198 * Because of source commands and .cshrc we need nested error catches. 199 */ 200 201 #include <setjmp.h> 202 jmp_buf reslab; 203 204 #define setexit() (setjmp(reslab)) 205 #define reset() longjmp(reslab, 1) 206 /* Should use structure assignment here */ 207 #define getexit(a) bcopy((char *)reslab, ((char *)(a)), sizeof reslab) 208 #define resexit(a) bcopy((char *)(a), (char *)reslab, sizeof reslab) 209 210 Char *gointr; /* Label for an onintr transfer */ 211 212 #include <signal.h> 213 sig_t parintr; /* Parents interrupt catch */ 214 sig_t parterm; /* Parents terminate catch */ 215 216 /* 217 * Lexical definitions. 218 * 219 * All lexical space is allocated dynamically. 220 * The eighth/sizteenth bit of characters is used to prevent recognition, 221 * and eventually stripped. 222 */ 223 #define META 0200 224 #define ASCII 0177 225 #ifdef SHORT_STRINGS 226 #define CHAR 0377 227 #define QUOTE 0100000 /* 16nth char bit used for 'ing */ 228 #define TRIM 0077777 /* Mask to strip quote bit */ 229 #else 230 #define CHAR 0177 231 #define QUOTE 0200 /* Eighth char bit used for 'ing */ 232 #define TRIM 0177 /* Mask to strip quote bit */ 233 #endif 234 235 int AsciiOnly; /* If set only 7 bits is expected in characters */ 236 237 /* 238 * Each level of input has a buffered input structure. 239 * There are one or more blocks of buffered input for each level, 240 * exactly one if the input is seekable and tell is available. 241 * In other cases, the shell buffers enough blocks to keep all loops 242 * in the buffer. 243 */ 244 struct Bin { 245 off_t Bfseekp; /* Seek pointer */ 246 off_t Bfbobp; /* Seekp of beginning of buffers */ 247 off_t Bfeobp; /* Seekp of end of buffers */ 248 short Bfblocks; /* Number of buffer blocks */ 249 Char **Bfbuf; /* The array of buffer blocks */ 250 } B; 251 252 #define fseekp B.Bfseekp 253 #define fbobp B.Bfbobp 254 #define feobp B.Bfeobp 255 #define fblocks B.Bfblocks 256 #define fbuf B.Bfbuf 257 258 /* 259 * The shell finds commands in loops by reseeking the input 260 * For whiles, in particular, it reseeks to the beginning of the 261 * line the while was on; hence the while placement restrictions. 262 */ 263 off_t lineloc; 264 265 bool cantell; /* Is current source tellable ? */ 266 267 /* 268 * Input lines are parsed into doubly linked circular 269 * lists of words of the following form. 270 */ 271 struct wordent { 272 Char *word; 273 struct wordent *prev; 274 struct wordent *next; 275 }; 276 277 /* 278 * During word building, both in the initial lexical phase and 279 * when expanding $ variable substitutions, expansion by `!' and `$' 280 * must be inhibited when reading ahead in routines which are themselves 281 * processing `!' and `$' expansion or after characters such as `\' or in 282 * quotations. The following flags are passed to the getC routines 283 * telling them which of these substitutions are appropriate for the 284 * next character to be returned. 285 */ 286 #define DODOL 1 287 #define DOEXCL 2 288 #define DOALL DODOL|DOEXCL 289 290 /* 291 * Labuf implements a general buffer for lookahead during lexical operations. 292 * Text which is to be placed in the input stream can be stuck here. 293 * We stick parsed ahead $ constructs during initial input, 294 * process id's from `$$', and modified variable values (from qualifiers 295 * during expansion in sh.dol.c) here. 296 */ 297 Char *lap; 298 299 /* 300 * Parser structure 301 * 302 * Each command is parsed to a tree of command structures and 303 * flags are set bottom up during this process, to be propagated down 304 * as needed during the semantics/exeuction pass (sh.sem.c). 305 */ 306 struct command { 307 short t_dtyp; /* Type of node */ 308 #define NODE_COMMAND 1 /* t_dcom <t_dlef >t_drit */ 309 #define NODE_PAREN 2 /* ( t_dspr ) <t_dlef >t_drit */ 310 #define NODE_PIPE 3 /* t_dlef | t_drit */ 311 #define NODE_LIST 4 /* t_dlef ; t_drit */ 312 #define NODE_OR 5 /* t_dlef || t_drit */ 313 #define NODE_AND 6 /* t_dlef && t_drit */ 314 short t_dflg; /* Flags, e.g. F_AMPERSAND|... */ 315 #define F_SAVE (F_NICE|F_TIME|F_NOHUP) /* save these when re-doing */ 316 317 #define F_AMPERSAND (1<<0) /* executes in background */ 318 #define F_APPEND (1<<1) /* output is redirected >> */ 319 #define F_PIPEIN (1<<2) /* input is a pipe */ 320 #define F_PIPEOUT (1<<3) /* output is a pipe */ 321 #define F_NOFORK (1<<4) /* don't fork, last ()ized cmd */ 322 #define F_NOINTERRUPT (1<<5) /* should be immune from intr's */ 323 /* spare */ 324 #define F_STDERR (1<<7) /* redirect unit 2 with unit 1 */ 325 #define F_OVERWRITE (1<<8) /* output was ! */ 326 #define F_READ (1<<9) /* input redirection is << */ 327 #define F_REPEAT (1<<10) /* reexec aft if, repeat,... */ 328 #define F_NICE (1<<11) /* t_nice is meaningful */ 329 #define F_NOHUP (1<<12) /* nohup this command */ 330 #define F_TIME (1<<13) /* time this command */ 331 union { 332 Char *T_dlef; /* Input redirect word */ 333 struct command *T_dcar; /* Left part of list/pipe */ 334 } L; 335 union { 336 Char *T_drit; /* Output redirect word */ 337 struct command *T_dcdr; /* Right part of list/pipe */ 338 } R; 339 #define t_dlef L.T_dlef 340 #define t_dcar L.T_dcar 341 #define t_drit R.T_drit 342 #define t_dcdr R.T_dcdr 343 Char **t_dcom; /* Command/argument vector */ 344 struct command *t_dspr; /* Pointer to ()'d subtree */ 345 short t_nice; 346 }; 347 348 349 /* 350 * The keywords for the parser 351 */ 352 #define T_BREAK 0 353 #define T_BRKSW 1 354 #define T_CASE 2 355 #define T_DEFAULT 3 356 #define T_ELSE 4 357 #define T_END 5 358 #define T_ENDIF 6 359 #define T_ENDSW 7 360 #define T_EXIT 8 361 #define T_FOREACH 9 362 #define T_GOTO 10 363 #define T_IF 11 364 #define T_LABEL 12 365 #define T_LET 13 366 #define T_SET 14 367 #define T_SWITCH 15 368 #define T_TEST 16 369 #define T_THEN 17 370 #define T_WHILE 18 371 372 /* 373 * Structure defining the existing while/foreach loops at this 374 * source level. Loops are implemented by seeking back in the 375 * input. For foreach (fe), the word list is attached here. 376 */ 377 struct whyle { 378 off_t w_start; /* Point to restart loop */ 379 off_t w_end; /* End of loop (0 if unknown) */ 380 Char **w_fe, **w_fe0; /* Current/initial wordlist for fe */ 381 Char *w_fename; /* Name for fe */ 382 struct whyle *w_next; /* Next (more outer) loop */ 383 } *whyles; 384 385 /* 386 * Variable structure 387 * 388 * Aliases and variables are stored in AVL balanced binary trees. 389 */ 390 struct varent { 391 Char **vec; /* Array of words which is the value */ 392 Char *v_name; /* Name of variable/alias */ 393 struct varent *v_link[3]; /* The links, see below */ 394 int v_bal; /* Balance factor */ 395 } shvhed, aliases; 396 397 #define v_left v_link[0] 398 #define v_right v_link[1] 399 #define v_parent v_link[2] 400 401 struct varent *adrof1(); 402 403 #define adrof(v) adrof1(v, &shvhed) 404 #define value(v) value1(v, &shvhed) 405 406 /* 407 * The following are for interfacing redo substitution in 408 * aliases to the lexical routines. 409 */ 410 struct wordent *alhistp; /* Argument list (first) */ 411 struct wordent *alhistt; /* Node after last in arg list */ 412 Char **alvec; /* The (remnants of) alias vector */ 413 414 /* 415 * Filename/command name expansion variables 416 */ 417 short gflag; /* After tglob -> is globbing needed? */ 418 419 #define MAXVARLEN 30 /* Maximum number of char in a variable name */ 420 421 /* 422 * Variables for filename expansion 423 */ 424 extern Char **gargv; /* Pointer to the (stack) arglist */ 425 extern long gargc; /* Number args in gargv */ 426 427 /* 428 * Variables for command expansion. 429 */ 430 extern Char **pargv; /* Pointer to the argv list space */ 431 extern long pargc; /* Count of arguments in pargv */ 432 Char *pargs; /* Pointer to start current word */ 433 long pnleft; /* Number of chars left in pargs */ 434 Char *pargcp; /* Current index into pargs */ 435 436 /* 437 * History list 438 * 439 * Each history list entry contains an embedded wordlist 440 * from the scanner, a number for the event, and a reference count 441 * to aid in discarding old entries. 442 * 443 * Essentially "invisible" entries are put on the history list 444 * when history substitution includes modifiers, and thrown away 445 * at the next discarding since their event numbers are very negative. 446 */ 447 struct Hist { 448 struct wordent Hlex; 449 int Hnum; 450 int Href; 451 long Htime; 452 struct Hist *Hnext; 453 } Histlist; 454 455 struct wordent paraml; /* Current lexical word list */ 456 int eventno; /* Next events number */ 457 int lastev; /* Last event reference (default) */ 458 459 Char HIST; /* history invocation character */ 460 Char HISTSUB; /* auto-substitute character */ 461 462 /* 463 * strings.h: 464 */ 465 #ifndef SHORT_STRINGS 466 #define Strchr(a, b) strchr(a, b) 467 #define Strrchr(a, b) strrchr(a, b) 468 #define Strcat(a, b) strcat(a, b) 469 #define Strncat(a, b, c) strncat(a, b, c) 470 #define Strcpy(a, b) strcpy(a, b) 471 #define Strncpy(a, b, c) strncpy(a, b, c) 472 #define Strlen(a) strlen(a) 473 #define Strcmp(a, b) strcmp(a, b) 474 #define Strncmp(a, b, c) strncmp(a, b, c) 475 476 #define Strspl(a, b) strspl(a, b) 477 #define Strsave(a) strsave(a) 478 #define Strend(a) strend(a) 479 #define Strstr(a, b) strstr(a, b) 480 481 #define str2short(a) (a) 482 #define blk2short(a) saveblk(a) 483 #define short2blk(a) saveblk(a) 484 #define short2str(a) (a) 485 #define short2qstr(a) (a) 486 #else 487 #define Strchr(a, b) s_strchr(a, b) 488 #define Strrchr(a, b) s_strrchr(a, b) 489 #define Strcat(a, b) s_strcat(a, b) 490 #define Strncat(a, b, c) s_strncat(a, b, c) 491 #define Strcpy(a, b) s_strcpy(a, b) 492 #define Strncpy(a, b, c) s_strncpy(a, b, c) 493 #define Strlen(a) s_strlen(a) 494 #define Strcmp(a, b) s_strcmp(a, b) 495 #define Strncmp(a, b, c) s_strncmp(a, b, c) 496 497 #define Strspl(a, b) s_strspl(a, b) 498 #define Strsave(a) s_strsave(a) 499 #define Strend(a) s_strend(a) 500 #define Strstr(a, b) s_strstr(a, b) 501 #endif 502 503 /* 504 * setname is a macro to save space (see sh.err.c) 505 */ 506 char *bname; 507 508 #define setname(a) (bname = (a)) 509 510 Char *Vsav; 511 Char *Vdp; 512 Char *Vexpath; 513 char **Vt; 514 515 Char **evalvec; 516 Char *evalp; 517 518 extern struct mesg { 519 char *iname; /* name from /usr/include */ 520 char *pname; /* print name */ 521 } mesg[]; 522 523 /* word_chars is set by default to WORD_CHARS but can be overridden by 524 the worchars variable--if unset, reverts to WORD_CHARS */ 525 526 Char *word_chars; 527 528 #define WORD_CHARS "*?_-.[]~=" /* default chars besides alnums in words */ 529 530 Char *STR_SHELLPATH; 531 532 #include <paths.h> 533 #ifdef _PATH_BSHELL 534 Char *STR_BSHELL; 535 #endif 536 Char *STR_WORD_CHARS; 537 Char **STR_environ; 538
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