1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 23 /* All Rights Reserved */ 24 25 26 /* 27 * Copyright (c) 1996, by Sun Microsystems, Inc. 28 * All rights reserved. 29 */ 30 31 #pragma ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.11.2.2 */ 32 /* 33 * UNIX shell 34 */ 35 36 #include "defs.h" 37 #include "sym.h" 38 #include <errno.h> 39 #include <fcntl.h> 40 41 static int readb(struct fileblk *, int, int); 42 43 /* ======== character handling for command lines ======== */ 44 45 46 word() 47 { 48 register unsigned int c, d, cc; 49 struct argnod *arg = (struct argnod *)locstak(); 50 register unsigned char *argp = arg->argval; 51 unsigned char *oldargp; 52 int alpha = 1; 53 unsigned char *pc; 54 55 wdnum = 0; 56 wdset = 0; 57 58 while (1) 59 { 60 while (c = nextwc(), space(c)) /* skipc() */ 61 ; 62 63 if (c == COMCHAR) 64 { 65 while ((c = readwc()) != NL && c != EOF); 66 peekc = c; 67 } 68 else 69 { 70 break; /* out of comment - white space loop */ 71 } 72 } 73 if (!eofmeta(c)) 74 { 75 do 76 { 77 if (c == LITERAL) 78 { 79 oldargp = argp; 80 while ((c = readwc()) && c != LITERAL){ 81 /* 82 * quote each character within 83 * single quotes 84 */ 85 pc = readw(c); 86 if (argp >= brkend) 87 growstak(argp); 88 *argp++='\\'; 89 /* Pick up rest of multibyte character */ 90 if (c == NL) 91 chkpr(); 92 while (c = *pc++) { 93 if (argp >= brkend) 94 growstak(argp); 95 *argp++ = (unsigned char)c; 96 } 97 } 98 if (argp == oldargp) { /* null argument - '' */ 99 /* 100 * Word will be represented by quoted null 101 * in macro.c if necessary 102 */ 103 if (argp >= brkend) 104 growstak(argp); 105 *argp++ = '"'; 106 if (argp >= brkend) 107 growstak(argp); 108 *argp++ = '"'; 109 } 110 } 111 else 112 { 113 if (c == 0) { 114 if (argp >= brkend) 115 growstak(argp); 116 *argp++ = 0; 117 } else { 118 pc = readw(c); 119 while (*pc) { 120 if (argp >= brkend) 121 growstak(argp); 122 *argp++ = *pc++; 123 } 124 } 125 if (c == '\\') { 126 if ((cc = readwc()) == 0) { 127 if (argp >= brkend) 128 growstak(argp); 129 *argp++ = 0; 130 } else { 131 pc = readw(cc); 132 while (*pc) { 133 if (argp >= brkend) 134 growstak(argp); 135 *argp++ = *pc++; 136 } 137 } 138 } 139 if (c == '=') 140 wdset |= alpha; 141 if (!alphanum(c)) 142 alpha = 0; 143 if (qotchar(c)) 144 { 145 d = c; 146 for (;;) 147 { 148 if ((c = nextwc()) == 0) { 149 if (argp >= brkend) 150 growstak(argp); 151 *argp++ = 0; 152 } else { 153 pc = readw(c); 154 while (*pc) { 155 if (argp >= brkend) 156 growstak(argp); 157 *argp++ = *pc++; 158 } 159 } 160 if (c == 0 || c == d) 161 break; 162 if (c == NL) 163 chkpr(); 164 /* 165 * don't interpret quoted 166 * characters 167 */ 168 if (c == '\\') { 169 if ((cc = readwc()) == 0) { 170 if (argp >= brkend) 171 growstak(argp); 172 *argp++ = 0; 173 } else { 174 pc = readw(cc); 175 while (*pc) { 176 if (argp >= brkend) 177 growstak(argp); 178 *argp++ = *pc++; 179 } 180 } 181 } 182 } 183 } 184 } 185 } while ((c = nextwc(), !eofmeta(c))); 186 argp = endstak(argp); 187 if (!letter(arg->argval[0])) 188 wdset = 0; 189 190 peekn = c | MARK; 191 if (arg->argval[1] == 0 && 192 (d = arg->argval[0], digit(d)) && 193 (c == '>' || c == '<')) 194 { 195 word(); 196 wdnum = d - '0'; 197 }else{ /* check for reserved words */ 198 if (reserv == FALSE || 199 (wdval = syslook(arg->argval, 200 reserved, no_reserved)) == 0) { 201 wdval = 0; 202 } 203 /* set arg for reserved words too */ 204 wdarg = arg; 205 } 206 }else if (dipchar(c)){ 207 if ((d = nextwc()) == c) 208 { 209 wdval = c | SYMREP; 210 if (c == '<') 211 { 212 if ((d = nextwc()) == '-') 213 wdnum |= IOSTRIP; 214 else 215 peekn = d | MARK; 216 } 217 } 218 else 219 { 220 peekn = d | MARK; 221 wdval = c; 222 } 223 } 224 else 225 { 226 if ((wdval = c) == EOF) 227 wdval = EOFSYM; 228 if (iopend && eolchar(c)) 229 { 230 struct ionod *tmp_iopend; 231 tmp_iopend = iopend; 232 iopend = 0; 233 copy(tmp_iopend); 234 } 235 } 236 reserv = FALSE; 237 return (wdval); 238 } 239 240 unsigned int skipwc() 241 { 242 register unsigned int c; 243 244 while (c = nextwc(), space(c)) 245 ; 246 return (c); 247 } 248 249 unsigned int nextwc() 250 { 251 register unsigned int c, d; 252 253 retry: 254 if ((d = readwc()) == ESCAPE) { 255 if ((c = readwc()) == NL) { 256 chkpr(); 257 goto retry; 258 } 259 peekc = c | MARK; 260 } 261 return (d); 262 } 263 264 unsigned char *readw(d) 265 wchar_t d; 266 { 267 static unsigned char c[MULTI_BYTE_MAX + 1]; 268 int length; 269 wchar_t l; 270 if (isascii(d)) { 271 c[0] = d; 272 c[1] = '\0'; 273 return (c); 274 } 275 276 length = wctomb((char *)c, d); 277 if (length <= 0) { 278 c[0] = (unsigned char)d; 279 length = 1; 280 } 281 c[length] = '\0'; 282 return (c); 283 } 284 285 unsigned int 286 readwc() 287 { 288 wchar_t c; 289 int len; 290 struct fileblk *f; 291 int mbmax = MB_CUR_MAX; 292 int i, mlen; 293 294 if (peekn) { 295 c = peekn & 0x7fffffff; 296 peekn = 0; 297 return (c); 298 } 299 if (peekc) { 300 c = peekc & 0x7fffffff; 301 peekc = 0; 302 return (c); 303 } 304 f = standin; 305 306 retry: 307 if (f->fend > f->fnxt) { 308 /* 309 * something in buffer 310 */ 311 if (*f->fnxt == 0) { 312 f->fnxt++; 313 f->nxtoff++; 314 if (f->feval == 0) 315 goto retry; /* = c = readc(); */ 316 if (estabf(*f->feval++)) 317 c = EOF; 318 else 319 c = SPACE; 320 if (flags & readpr && standin->fstak == 0) 321 prc(c); 322 if (c == NL) 323 f->flin++; 324 return (c); 325 } 326 327 if (isascii(c = (unsigned char)*f->fnxt)) { 328 f->fnxt++; 329 f->nxtoff++; 330 if (flags & readpr && standin->fstak == 0) 331 prc(c); 332 if (c == NL) 333 f->flin++; 334 return (c); 335 } 336 337 for (i = 1; i <= mbmax; i++) { 338 int rest; 339 if ((rest = f->fend - f->fnxt) < i) { 340 /* 341 * not enough bytes available 342 * f->fsiz could be BUFFERSIZE or 1 343 * since mbmax is enough smaller than BUFFERSIZE, 344 * this loop won't overrun the f->fbuf buffer. 345 */ 346 len = readb(f, 347 (f->fsiz == 1) ? 1 : (f->fsiz - rest), 348 rest); 349 if (len == 0) 350 break; 351 } 352 mlen = mbtowc(&c, (char *)f->fnxt, i); 353 if (mlen > 0) 354 break; 355 } 356 357 if (i > mbmax) { 358 /* 359 * enough bytes available but cannot be converted to 360 * a valid wchar. 361 */ 362 c = (unsigned char)*f->fnxt; 363 mlen = 1; 364 } 365 366 f->fnxt += mlen; 367 f->nxtoff += mlen; 368 if (flags & readpr && standin->fstak == 0) 369 prwc(c); 370 if (c == NL) 371 f->flin++; 372 return (c); 373 } 374 375 if (f->feof || f->fdes < 0){ 376 c = EOF; 377 f->feof++; 378 return (c); 379 } 380 381 if (readb(f, f->fsiz, 0) <= 0){ 382 if (f->fdes != input || !isatty(input)) { 383 close(f->fdes); 384 f->fdes = -1; 385 } 386 f->feof++; 387 c = EOF; 388 return (c); 389 } 390 goto retry; 391 } 392 393 static int 394 readb(struct fileblk *f, int toread, int rest) 395 { 396 int len; 397 int fflags; 398 399 if (rest) { 400 /* 401 * copies the remaining 'rest' bytes from f->fnxt 402 * to f->fbuf 403 */ 404 (void) memcpy(f->fbuf, f->fnxt, rest); 405 f->fnxt = f->fbuf; 406 f->fend = f->fnxt + rest; 407 f->nxtoff = 0; 408 f->endoff = rest; 409 if (f->fbuf[rest - 1] == '\n') { 410 /* 411 * if '\n' found, it should be 412 * a bondary of multibyte char. 413 */ 414 return (rest); 415 } 416 } 417 418 retry: 419 do { 420 if (trapnote & SIGSET) { 421 newline(); 422 sigchk(); 423 } else if ((trapnote & TRAPSET) && (rwait > 0)) { 424 newline(); 425 chktrap(); 426 clearup(); 427 } 428 } while ((len = read(f->fdes, f->fbuf + rest, toread)) < 0 && trapnote); 429 /* 430 * if child sets O_NDELAY or O_NONBLOCK on stdin 431 * and exited then turn the modes off and retry 432 */ 433 if (len == 0) { 434 if (((flags & intflg) || 435 ((flags & oneflg) == 0 && isatty(input) && 436 (flags & stdflg))) && 437 ((fflags = fcntl(f->fdes, F_GETFL, 0)) & O_NDELAY)) { 438 fflags &= ~O_NDELAY; 439 fcntl(f->fdes, F_SETFL, fflags); 440 goto retry; 441 } 442 } else if (len < 0) { 443 if (errno == EAGAIN) { 444 fflags = fcntl(f->fdes, F_GETFL, 0); 445 fflags &= ~O_NONBLOCK; 446 fcntl(f->fdes, F_SETFL, fflags); 447 goto retry; 448 } 449 len = 0; 450 } 451 f->fnxt = f->fbuf; 452 f->fend = f->fnxt + (len + rest); 453 f->nxtoff = 0; 454 f->endoff = len + rest; 455 return (len + rest); 456 } 457