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 * @(#)csh.h 5.8 (Berkeley) 03/14/91 7 */ 8 9 #include <sys/param.h> 10 #include <sys/time.h> 11 #include <sys/resource.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 #define isdir(d) ((d.st_mode & S_IFMT) == S_IFDIR) 30 31 typedef char bool; 32 33 #define eq(a, b) (strcmp(a, b) == 0) 34 35 /* 36 * Global flags 37 */ 38 bool chkstop; /* Warned of stopped jobs... allow exit */ 39 bool didfds; /* Have setup i/o fd's for child */ 40 bool doneinp; /* EOF indicator after reset from readc */ 41 bool exiterr; /* Exit if error or non-zero exit status */ 42 bool child; /* Child shell ... errors cause exit */ 43 bool haderr; /* Reset was because of an error */ 44 bool intty; /* Input is a tty */ 45 bool intact; /* We are interactive... therefore prompt */ 46 bool justpr; /* Just print because of :p hist mod */ 47 bool loginsh; /* We are a loginsh -> .login/.logout */ 48 bool neednote; /* Need to pnotify() */ 49 bool noexec; /* Don't execute, just syntax check */ 50 bool pjobs; /* want to print jobs if interrupted */ 51 bool setintr; /* Set interrupts on/off -> Wait intr... */ 52 bool timflg; /* Time the next waited for command */ 53 bool havhash; /* path hashing is available */ 54 #ifdef FILEC 55 bool filec; /* doing filename expansion */ 56 #endif 57 58 /* 59 * Global i/o info 60 */ 61 char *arginp; /* Argument input for sh -c and internal `xx` */ 62 int onelflg; /* 2 -> need line for -t, 1 -> exit on read */ 63 char *file; /* Name of shell file for $0 */ 64 65 char *err; /* Error message from scanner/parser */ 66 int errno; /* Error from C library routines */ 67 char *shtemp; /* Temp name for << shell files in /tmp */ 68 struct timeval time0; /* Time at which the shell started */ 69 struct rusage ru0; 70 71 /* 72 * Miscellany 73 */ 74 char *doldol; /* Character pid for $$ */ 75 int uid; /* Invokers uid */ 76 time_t chktim; /* Time mail last checked */ 77 int shpgrp; /* Pgrp of shell */ 78 int tpgrp; /* Terminal process group */ 79 /* If tpgrp is -1, leave tty alone! */ 80 int opgrp; /* Initial pgrp and tty pgrp */ 81 82 /* 83 * These are declared here because they want to be 84 * initialized in sh.init.c (to allow them to be made readonly) 85 */ 86 87 struct biltins { 88 char *bname; 89 int (*bfunct)(); 90 short minargs, maxargs; 91 } bfunc[]; 92 extern int nbfunc; 93 94 struct srch { 95 char *s_name; 96 short s_value; 97 } srchn[]; 98 extern int nsrchn; 99 100 /* 101 * To be able to redirect i/o for builtins easily, the shell moves the i/o 102 * descriptors it uses away from 0,1,2. 103 * Ideally these should be in units which are closed across exec's 104 * (this saves work) but for version 6, this is not usually possible. 105 * The desired initial values for these descriptors are defined in 106 * sh.local.h. 107 */ 108 short SHIN; /* Current shell input (script) */ 109 short SHOUT; /* Shell output */ 110 short SHDIAG; /* Diagnostic output... shell errs go here */ 111 short OLDSTD; /* Old standard input (def for cmds) */ 112 113 /* 114 * Error control 115 * 116 * Errors in scanning and parsing set up an error message to be printed 117 * at the end and complete. Other errors always cause a reset. 118 * Because of source commands and .cshrc we need nested error catches. 119 */ 120 121 jmp_buf reslab; 122 123 #define setexit() ((void) setjmp(reslab)) 124 #define reset() longjmp(reslab, 0) 125 /* Should use structure assignment here */ 126 #define getexit(a) bcopy((char *)reslab, (char *)(a), sizeof reslab) 127 #define resexit(a) bcopy(((char *)(a)), (char *)reslab, sizeof reslab) 128 129 char *gointr; /* Label for an onintr transfer */ 130 sig_t parintr; /* Parents interrupt catch */ 131 sig_t parterm; /* Parents terminate catch */ 132 133 /* 134 * Lexical definitions. 135 * 136 * All lexical space is allocated dynamically. 137 * The eighth bit of characters is used to prevent recognition, 138 * and eventually stripped. 139 */ 140 #define QUOTE 0200 /* Eighth char bit used internally for 'ing */ 141 #define TRIM 0177 /* Mask to strip quote bit */ 142 143 /* 144 * Each level of input has a buffered input structure. 145 * There are one or more blocks of buffered input for each level, 146 * exactly one if the input is seekable and tell is available. 147 * In other cases, the shell buffers enough blocks to keep all loops 148 * in the buffer. 149 */ 150 struct Bin { 151 off_t Bfseekp; /* Seek pointer */ 152 off_t Bfbobp; /* Seekp of beginning of buffers */ 153 off_t Bfeobp; /* Seekp of end of buffers */ 154 short Bfblocks; /* Number of buffer blocks */ 155 char **Bfbuf; /* The array of buffer blocks */ 156 } B; 157 158 #define fseekp B.Bfseekp 159 #define fbobp B.Bfbobp 160 #define feobp B.Bfeobp 161 #define fblocks B.Bfblocks 162 #define fbuf B.Bfbuf 163 164 #define btell() fseekp 165 166 #ifndef btell 167 off_t btell(); 168 #endif 169 170 /* 171 * The shell finds commands in loops by reseeking the input 172 * For whiles, in particular, it reseeks to the beginning of the 173 * line the while was on; hence the while placement restrictions. 174 */ 175 off_t lineloc; 176 177 #ifdef TELL 178 bool cantell; /* Is current source tellable ? */ 179 #endif 180 181 /* 182 * Input lines are parsed into doubly linked circular 183 * lists of words of the following form. 184 */ 185 struct wordent { 186 char *word; 187 struct wordent *prev; 188 struct wordent *next; 189 }; 190 191 /* 192 * During word building, both in the initial lexical phase and 193 * when expanding $ variable substitutions, expansion by `!' and `$' 194 * must be inhibited when reading ahead in routines which are themselves 195 * processing `!' and `$' expansion or after characters such as `\' or in 196 * quotations. The following flags are passed to the getC routines 197 * telling them which of these substitutions are appropriate for the 198 * next character to be returned. 199 */ 200 #define DODOL 1 201 #define DOEXCL 2 202 #define DOALL DODOL|DOEXCL 203 204 /* 205 * Labuf implements a general buffer for lookahead during lexical operations. 206 * Text which is to be placed in the input stream can be stuck here. 207 * We stick parsed ahead $ constructs during initial input, 208 * process id's from `$$', and modified variable values (from qualifiers 209 * during expansion in sh.dol.c) here. 210 */ 211 char labuf[BUFSIZ]; 212 213 char *lap; 214 215 /* 216 * Parser structure 217 * 218 * Each command is parsed to a tree of command structures and 219 * flags are set bottom up during this process, to be propagated down 220 * as needed during the semantics/exeuction pass (sh.sem.c). 221 */ 222 struct command { 223 short t_dtyp; /* Type of node */ 224 short t_dflg; /* Flags, e.g. FAND|... */ 225 union { 226 char *T_dlef; /* Input redirect word */ 227 struct command *T_dcar; /* Left part of list/pipe */ 228 } L; 229 union { 230 char *T_drit; /* Output redirect word */ 231 struct command *T_dcdr; /* Right part of list/pipe */ 232 } R; 233 #define t_dlef L.T_dlef 234 #define t_dcar L.T_dcar 235 #define t_drit R.T_drit 236 #define t_dcdr R.T_dcdr 237 char **t_dcom; /* Command/argument vector */ 238 struct command *t_dspr; /* Pointer to ()'d subtree */ 239 short t_nice; 240 }; 241 242 #define TCOM 1 /* t_dcom <t_dlef >t_drit */ 243 #define TPAR 2 /* ( t_dspr ) <t_dlef >t_drit */ 244 #define TFIL 3 /* t_dlef | t_drit */ 245 #define TLST 4 /* t_dlef ; t_drit */ 246 #define TOR 5 /* t_dlef || t_drit */ 247 #define TAND 6 /* t_dlef && t_drit */ 248 249 #define FSAVE (FNICE|FTIME|FNOHUP) /* save these when re-doing */ 250 251 #define FAND (1<<0) /* executes in background */ 252 #define FCAT (1<<1) /* output is redirected >> */ 253 #define FPIN (1<<2) /* input is a pipe */ 254 #define FPOU (1<<3) /* output is a pipe */ 255 #define FPAR (1<<4) /* don't fork, last ()ized cmd */ 256 #define FINT (1<<5) /* should be immune from intr's */ 257 /* spare */ 258 #define FDIAG (1<<7) /* redirect unit 2 with unit 1 */ 259 #define FANY (1<<8) /* output was ! */ 260 #define FHERE (1<<9) /* input redirection is << */ 261 #define FREDO (1<<10) /* reexec aft if, repeat,... */ 262 #define FNICE (1<<11) /* t_nice is meaningful */ 263 #define FNOHUP (1<<12) /* nohup this command */ 264 #define FTIME (1<<13) /* time this command */ 265 266 /* 267 * The keywords for the parser 268 */ 269 #define ZBREAK 0 270 #define ZBRKSW 1 271 #define ZCASE 2 272 #define ZDEFAULT 3 273 #define ZELSE 4 274 #define ZEND 5 275 #define ZENDIF 6 276 #define ZENDSW 7 277 #define ZEXIT 8 278 #define ZFOREACH 9 279 #define ZGOTO 10 280 #define ZIF 11 281 #define ZLABEL 12 282 #define ZLET 13 283 #define ZSET 14 284 #define ZSWITCH 15 285 #define ZTEST 16 286 #define ZTHEN 17 287 #define ZWHILE 18 288 289 /* 290 * Structure defining the existing while/foreach loops at this 291 * source level. Loops are implemented by seeking back in the 292 * input. For foreach (fe), the word list is attached here. 293 */ 294 struct whyle { 295 off_t w_start; /* Point to restart loop */ 296 off_t w_end; /* End of loop (0 if unknown) */ 297 char **w_fe, **w_fe0; /* Current/initial wordlist for fe */ 298 char *w_fename; /* Name for fe */ 299 struct whyle *w_next; /* Next (more outer) loop */ 300 } *whyles; 301 302 /* 303 * Variable structure 304 * 305 * Aliases and variables are stored in AVL balanced binary trees. 306 */ 307 struct varent { 308 char **vec; /* Array of words which is the value */ 309 char *v_name; /* Name of variable/alias */ 310 struct varent *v_link[3]; /* The links, see below */ 311 int v_bal; /* Balance factor */ 312 } shvhed, aliases; 313 #define v_left v_link[0] 314 #define v_right v_link[1] 315 #define v_parent v_link[2] 316 317 struct varent *adrof1(); 318 #define adrof(v) adrof1(v, &shvhed) 319 #define value(v) value1(v, &shvhed) 320 321 /* 322 * The following are for interfacing redo substitution in 323 * aliases to the lexical routines. 324 */ 325 struct wordent *alhistp; /* Argument list (first) */ 326 struct wordent *alhistt; /* Node after last in arg list */ 327 char **alvec; /* The (remnants of) alias vector */ 328 329 /* 330 * Filename/command name expansion variables 331 */ 332 short gflag; /* After tglob -> is globbing needed? */ 333 334 /* 335 * A reasonable limit on number of arguments would seem to be 336 * the maximum number of characters in an arg list / 6. 337 */ 338 #define GAVSIZ NCARGS / 6 339 340 /* 341 * Variables for filename expansion 342 */ 343 char **gargv; /* Pointer to the (stack) arglist */ 344 short gargc; /* Number args in gargv */ 345 346 /* 347 * Variables for command expansion. 348 */ 349 char **pargv; /* Pointer to the argv list space */ 350 char *pargs; /* Pointer to start current word */ 351 short pargc; /* Count of arguments in pargv */ 352 short pnleft; /* Number of chars left in pargs */ 353 char *pargcp; /* Current index into pargs */ 354 355 /* 356 * History list 357 * 358 * Each history list entry contains an embedded wordlist 359 * from the scanner, a number for the event, and a reference count 360 * to aid in discarding old entries. 361 * 362 * Essentially "invisible" entries are put on the history list 363 * when history substitution includes modifiers, and thrown away 364 * at the next discarding since their event numbers are very negative. 365 */ 366 struct Hist { 367 struct wordent Hlex; 368 int Hnum; 369 int Href; 370 struct Hist *Hnext; 371 } Histlist; 372 373 struct wordent paraml; /* Current lexical word list */ 374 int eventno; /* Next events number */ 375 int lastev; /* Last event reference (default) */ 376 377 char HIST; /* history invocation character */ 378 char HISTSUB; /* auto-substitute character */ 379 380 /* 381 * In lines for frequently called functions 382 */ 383 #define XFREE(cp) { \ 384 extern char end[]; \ 385 char stack; \ 386 if ((cp) >= end && (cp) < &stack) \ 387 free(cp); \ 388 } 389 char *alloctmp; 390 #define xalloc(i) ((alloctmp = malloc(i)) ? alloctmp : (char *)nomem(i)) 391 #define xrealloc(p, i) ((alloctmp = realloc(p, i)) ? alloctmp : (char *)nomem(i)) 392 393 char *Dfix1(); 394 char **blkcat(); 395 char **blkcpy(); 396 char **blkend(); 397 char **blkspl(); 398 char *calloc(); 399 char *malloc(); 400 char *realloc(); 401 char *cname(); 402 char **copyblk(); 403 char **dobackp(); 404 char *domod(); 405 struct wordent *dosub(); 406 char *exp3(); 407 char *exp3a(); 408 char *exp4(); 409 char *exp5(); 410 char *exp6(); 411 struct Hist *enthist(); 412 struct Hist *findev(); 413 struct wordent *freenod(); 414 char *getenv(); 415 char *getinx(); 416 struct varent *getvx(); 417 struct passwd *getpwnam(); 418 struct wordent *gethent(); 419 struct wordent *getsub(); 420 char *getwd(); 421 char **globall(); 422 char *globone(); 423 char *index(); 424 struct biltins *isbfunc(); 425 off_t lseek(); 426 char *operate(); 427 int phup(); 428 void pintr(); 429 void pchild(); 430 char *putn(); 431 char *rindex(); 432 char **saveblk(); 433 char *savestr(); 434 char *strcat(); 435 char *strcpy(); 436 char *strend(); 437 char *strings(); 438 char *strip(); 439 char *strspl(); 440 char *subword(); 441 struct command *syntax(); 442 struct command *syn0(); 443 struct command *syn1(); 444 struct command *syn1a(); 445 struct command *syn1b(); 446 struct command *syn2(); 447 struct command *syn3(); 448 char *value1(); 449 char *xhome(); 450 char *xname(); 451 char *xset(); 452 453 #define NOSTR ((char *) 0) 454 455 /* 456 * setname is a macro to save space (see sh.err.c) 457 */ 458 char *bname; 459 #define setname(a) (bname = (a)) 460 461 #ifdef VFORK 462 char *Vsav; 463 char **Vav; 464 char *Vdp; 465 #endif 466 467 char **evalvec; 468 char *evalp; 469 470 struct mesg { 471 char *iname; /* name from /usr/include */ 472 char *pname; /* print name */ 473 } mesg[]; 474