1 /* csh.h 4.4 05/07/82 */ 2 3 #include "sh.local.h" 4 #ifdef VMUNIX 5 #include <sys/vtimes.h> 6 #endif 7 8 /* 9 * C shell 10 * 11 * Bill Joy, UC Berkeley 12 * October, 1978; May 1980 13 * 14 * Jim Kulp, IIASA, Laxenburg Austria 15 * April, 1980 16 */ 17 #include <sys/param.h> 18 #include <sys/stat.h> 19 20 #define isdir(d) ((d.st_mode & S_IFMT) == S_IFDIR) 21 22 #include <errno.h> 23 #include <setjmp.h> 24 #include <signal.h> 25 #include <sys/times.h> 26 27 typedef char bool; 28 29 #define eq(a, b) (strcmp(a, b) == 0) 30 31 /* 32 * Global flags 33 */ 34 bool chkstop; /* Warned of stopped jobs... allow exit */ 35 bool didcch; /* Have closed unused fd's for child */ 36 bool didfds; /* Have setup i/o fd's for child */ 37 bool doneinp; /* EOF indicator after reset from readc */ 38 bool exiterr; /* Exit if error or non-zero exit status */ 39 bool child; /* Child shell ... errors cause exit */ 40 bool haderr; /* Reset was because of an error */ 41 bool intty; /* Input is a tty */ 42 bool intact; /* We are interactive... therefore prompt */ 43 bool justpr; /* Just print because of :p hist mod */ 44 bool loginsh; /* We are a loginsh -> .login/.logout */ 45 bool neednote; /* Need to pnotify() */ 46 bool noexec; /* Don't execute, just syntax check */ 47 bool pjobs; /* want to print jobs if interrupted */ 48 bool setintr; /* Set interrupts on/off -> Wait intr... */ 49 bool timflg; /* Time the next waited for command */ 50 51 /* 52 * Global i/o info 53 */ 54 char *arginp; /* Argument input for sh -c and internal `xx` */ 55 int onelflg; /* 2 -> need line for -t, 1 -> exit on read */ 56 char *file; /* Name of shell file for $0 */ 57 58 char *err; /* Error message from scanner/parser */ 59 int errno; /* Error from C library routines */ 60 char *shtemp; /* Temp name for << shell files in /tmp */ 61 time_t time0; /* Time at which the shell started */ 62 63 /* 64 * Miscellany 65 */ 66 char *doldol; /* Character pid for $$ */ 67 int uid; /* Invokers uid */ 68 time_t chktim; /* Time mail last checked */ 69 short shpgrp; /* Pgrp of shell */ 70 short tpgrp; /* Terminal process group */ 71 /* If tpgrp is -1, leave tty alone! */ 72 short opgrp; /* Initial pgrp and tty pgrp */ 73 int oldisc; /* Initial line discipline or -1 */ 74 struct tms shtimes; /* shell and child times for process timing */ 75 76 /* 77 * These are declared here because they want to be 78 * initialized in sh.init.c (to allow them to be made readonly) 79 */ 80 81 struct biltins { 82 char *bname; 83 int (*bfunct)(); 84 short minargs, maxargs; 85 } bfunc[]; 86 87 #define INF 1000 88 89 struct srch { 90 char *s_name; 91 short s_value; 92 } srchn[]; 93 94 /* 95 * To be able to redirect i/o for builtins easily, the shell moves the i/o 96 * descriptors it uses away from 0,1,2. 97 * Ideally these should be in units which are closed across exec's 98 * (this saves work) but for version 6, this is not usually possible. 99 * The desired initial values for these descriptors are defined in 100 * sh.local.h. 101 */ 102 short SHIN; /* Current shell input (script) */ 103 short SHOUT; /* Shell output */ 104 short SHDIAG; /* Diagnostic output... shell errs go here */ 105 short OLDSTD; /* Old standard input (def for cmds) */ 106 107 /* 108 * Error control 109 * 110 * Errors in scanning and parsing set up an error message to be printed 111 * at the end and complete. Other errors always cause a reset. 112 * Because of source commands and .cshrc we need nested error catches. 113 */ 114 115 jmp_buf reslab; 116 117 #define setexit() setjmp(reslab) 118 #define reset() longjmp(reslab) 119 /* Should use structure assignment here */ 120 #define getexit(a) copy((char *)(a), (char *)reslab, sizeof reslab) 121 #define resexit(a) copy((char *)reslab, ((char *)(a)), sizeof reslab) 122 123 char *gointr; /* Label for an onintr transfer */ 124 int (*parintr)(); /* Parents interrupt catch */ 125 int (*parterm)(); /* Parents terminate catch */ 126 127 /* 128 * Lexical definitions. 129 * 130 * All lexical space is allocated dynamically. 131 * The eighth bit of characters is used to prevent recognition, 132 * and eventually stripped. 133 */ 134 #define QUOTE 0200 /* Eighth char bit used internally for 'ing */ 135 #define TRIM 0177 /* Mask to strip quote bit */ 136 137 /* 138 * Each level of input has a buffered input structure. 139 * There are one or more blocks of buffered input for each level, 140 * exactly one if the input is seekable and tell is available. 141 * In other cases, the shell buffers enough blocks to keep all loops 142 * in the buffer. 143 */ 144 struct Bin { 145 off_t Bfseekp; /* Seek pointer */ 146 off_t Bfbobp; /* Seekp of beginning of buffers */ 147 off_t Bfeobp; /* Seekp of end of buffers */ 148 short Bfblocks; /* Number of buffer blocks */ 149 char **Bfbuf; /* The array of buffer blocks */ 150 } B; 151 152 #define fseekp B.Bfseekp 153 #define fbobp B.Bfbobp 154 #define feobp B.Bfeobp 155 #define fblocks B.Bfblocks 156 #define fbuf B.Bfbuf 157 158 off_t btell(); 159 160 /* 161 * The shell finds commands in loops by reseeking the input 162 * For whiles, in particular, it reseeks to the beginning of the 163 * line the while was on; hence the while placement restrictions. 164 */ 165 off_t lineloc; 166 167 #ifdef TELL 168 off_t tell(); 169 bool cantell; /* Is current source tellable ? */ 170 #endif 171 172 /* 173 * Input lines are parsed into doubly linked circular 174 * lists of words of the following form. 175 */ 176 struct wordent { 177 char *word; 178 struct wordent *prev; 179 struct wordent *next; 180 }; 181 182 /* 183 * During word building, both in the initial lexical phase and 184 * when expanding $ variable substitutions, expansion by `!' and `$' 185 * must be inhibited when reading ahead in routines which are themselves 186 * processing `!' and `$' expansion or after characters such as `\' or in 187 * quotations. The following flags are passed to the getC routines 188 * telling them which of these substitutions are appropriate for the 189 * next character to be returned. 190 */ 191 #define DODOL 1 192 #define DOEXCL 2 193 #define DOALL DODOL|DOEXCL 194 195 /* 196 * Labuf implements a general buffer for lookahead during lexical operations. 197 * Text which is to be placed in the input stream can be stuck here. 198 * We stick parsed ahead $ constructs during initial input, 199 * process id's from `$$', and modified variable values (from qualifiers 200 * during expansion in sh.dol.c) here. 201 */ 202 #ifdef VMUNIX 203 char labuf[BUFSIZ]; 204 #else 205 char labuf[256]; 206 #endif 207 208 char *lap; 209 210 /* 211 * Parser structure 212 * 213 * Each command is parsed to a tree of command structures and 214 * flags are set bottom up during this process, to be propagated down 215 * as needed during the semantics/exeuction pass (sh.sem.c). 216 */ 217 struct command { 218 short t_dtyp; /* Type of node */ 219 short t_dflg; /* Flags, e.g. FAND|... */ 220 union { 221 char *T_dlef; /* Input redirect word */ 222 struct command *T_dcar; /* Left part of list/pipe */ 223 } L; 224 union { 225 char *T_drit; /* Output redirect word */ 226 struct command *T_dcdr; /* Right part of list/pipe */ 227 } R; 228 #define t_dlef L.T_dlef 229 #define t_dcar L.T_dcar 230 #define t_drit R.T_drit 231 #define t_dcdr R.T_dcdr 232 char **t_dcom; /* Command/argument vector */ 233 struct command *t_dspr; /* Pointer to ()'d subtree */ 234 short t_nice; 235 }; 236 237 #define TCOM 1 /* t_dcom <t_dlef >t_drit */ 238 #define TPAR 2 /* ( t_dspr ) <t_dlef >t_drit */ 239 #define TFIL 3 /* t_dlef | t_drit */ 240 #define TLST 4 /* t_dlef ; t_drit */ 241 #define TOR 5 /* t_dlef || t_drit */ 242 #define TAND 6 /* t_dlef && t_drit */ 243 244 #define FSAVE (FNICE|FTIME|FNOHUP) /* save these when re-doing */ 245 246 #define FAND (1<<0) /* executes in background */ 247 #define FCAT (1<<1) /* output is redirected >> */ 248 #define FPIN (1<<2) /* input is a pipe */ 249 #define FPOU (1<<3) /* output is a pipe */ 250 #define FPAR (1<<4) /* don't fork, last ()ized cmd */ 251 #define FINT (1<<5) /* should be immune from intr's */ 252 /* spare */ 253 #define FDIAG (1<<7) /* redirect unit 2 with unit 1 */ 254 #define FANY (1<<8) /* output was ! */ 255 #define FHERE (1<<9) /* input redirection is << */ 256 #define FREDO (1<<10) /* reexec aft if, repeat,... */ 257 #define FNICE (1<<11) /* t_nice is meaningful */ 258 #define FNOHUP (1<<12) /* nohup this command */ 259 #define FTIME (1<<13) /* time this command */ 260 261 /* 262 * The keywords for the parser 263 */ 264 #define ZBREAK 0 265 #define ZBRKSW 1 266 #define ZCASE 2 267 #define ZDEFAULT 3 268 #define ZELSE 4 269 #define ZEND 5 270 #define ZENDIF 6 271 #define ZENDSW 7 272 #define ZEXIT 8 273 #define ZFOREACH 9 274 #define ZGOTO 10 275 #define ZIF 11 276 #define ZLABEL 12 277 #define ZLET 13 278 #define ZSET 14 279 #define ZSWITCH 15 280 #define ZTEST 16 281 #define ZTHEN 17 282 #define ZWHILE 18 283 284 /* 285 * Structure defining the existing while/foreach loops at this 286 * source level. Loops are implemented by seeking back in the 287 * input. For foreach (fe), the word list is attached here. 288 */ 289 struct whyle { 290 off_t w_start; /* Point to restart loop */ 291 off_t w_end; /* End of loop (0 if unknown) */ 292 char **w_fe, **w_fe0; /* Current/initial wordlist for fe */ 293 char *w_fename; /* Name for fe */ 294 struct whyle *w_next; /* Next (more outer) loop */ 295 } *whyles; 296 297 /* 298 * Variable structure 299 * 300 * Lists of aliases and variables are sorted alphabetically by name 301 */ 302 struct varent { 303 char **vec; /* Array of words which is the value */ 304 char *name; /* Name of variable/alias */ 305 struct varent *link; 306 } shvhed, aliases; 307 308 /* 309 * The following are for interfacing redo substitution in 310 * aliases to the lexical routines. 311 */ 312 struct wordent *alhistp; /* Argument list (first) */ 313 struct wordent *alhistt; /* Node after last in arg list */ 314 char **alvec; /* The (remnants of) alias vector */ 315 316 /* 317 * Filename/command name expansion variables 318 */ 319 short gflag; /* After tglob -> is globbing needed? */ 320 321 /* 322 * A reasonable limit on number of arguments would seem to be 323 * the maximum number of characters in an arg list / 6. 324 */ 325 #define GAVSIZ NCARGS / 6 326 327 /* 328 * Variables for filename expansion 329 */ 330 char **gargv; /* Pointer to the (stack) arglist */ 331 short gargc; /* Number args in gargv */ 332 short gnleft; 333 334 /* 335 * Variables for command expansion. 336 */ 337 char **pargv; /* Pointer to the argv list space */ 338 char *pargs; /* Pointer to start current word */ 339 short pargc; /* Count of arguments in pargv */ 340 short pnleft; /* Number of chars left in pargs */ 341 char *pargcp; /* Current index into pargs */ 342 343 /* 344 * History list 345 * 346 * Each history list entry contains an embedded wordlist 347 * from the scanner, a number for the event, and a reference count 348 * to aid in discarding old entries. 349 * 350 * Essentially "invisible" entries are put on the history list 351 * when history substitution includes modifiers, and thrown away 352 * at the next discarding since their event numbers are very negative. 353 */ 354 struct Hist { 355 struct wordent Hlex; 356 int Hnum; 357 int Href; 358 struct Hist *Hnext; 359 } Histlist; 360 361 struct wordent paraml; /* Current lexical word list */ 362 int eventno; /* Next events number */ 363 int lastev; /* Last event reference (default) */ 364 365 char HIST; /* history invocation character */ 366 char HISTSUB; /* auto-substitute character */ 367 368 char *Dfix1(); 369 struct varent *adrof(), *adrof1(); 370 char **blkcat(); 371 char **blkcpy(); 372 char **blkend(); 373 char **blkspl(); 374 char *calloc(); 375 char *cname(); 376 char **copyblk(); 377 char **dobackp(); 378 char *domod(); 379 struct wordent *dosub(); 380 char *exp3(); 381 char *exp3a(); 382 char *exp4(); 383 char *exp5(); 384 char *exp6(); 385 struct Hist *enthist(); 386 struct Hist *findev(); 387 struct wordent *freenod(); 388 char *getenv(); 389 char *getinx(); 390 struct varent *getvx(); 391 struct passwd *getpwnam(); 392 struct wordent *gethent(); 393 struct wordent *getsub(); 394 char *getwd(); 395 char *globone(); 396 struct biltins *isbfunc(); 397 char **glob(); 398 char *operate(); 399 int phup(); 400 int pintr(); 401 int pchild(); 402 char *putn(); 403 char **saveblk(); 404 char *savestr(); 405 char *strcat(); 406 char *strcpy(); 407 char *strend(); 408 char *strings(); 409 char *strip(); 410 char *strspl(); 411 char *subword(); 412 struct command *syntax(); 413 struct command *syn0(); 414 struct command *syn1(); 415 struct command *syn1a(); 416 struct command *syn1b(); 417 struct command *syn2(); 418 struct command *syn3(); 419 int tglob(); 420 int trim(); 421 char *value(), *value1(); 422 char *xhome(); 423 char *xname(); 424 char *xset(); 425 426 #define NOSTR ((char *) 0) 427 428 /* 429 * setname is a macro to save space (see sh.err.c) 430 */ 431 char *bname; 432 #define setname(a) bname = (a); 433 434 #ifdef VFORK 435 char *Vsav; 436 char **Vav; 437 char *Vdp; 438 #endif 439 440 #ifdef VMUNIX 441 struct vtimes zvms; 442 #endif 443 444 char **evalvec; 445 char *evalp; 446 447 struct mesg { 448 char *iname; /* name from /usr/include */ 449 char *pname; /* print name */ 450 } mesg[]; 451