1 /*- 2 * Copyright (c) 1992 Diomidis Spinellis. 3 * Copyright (c) 1992, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Diomidis Spinellis of Imperial College, University of London. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38 #ifndef lint 39 /* from: static char sccsid[] = "@(#)process.c 8.1 (Berkeley) 6/6/93"; */ 40 static char *rcsid = "$Id: process.c,v 1.13 1994/03/24 15:55:01 mycroft Exp $"; 41 #endif /* not lint */ 42 43 #include <sys/types.h> 44 #include <sys/stat.h> 45 #include <sys/ioctl.h> 46 #include <sys/uio.h> 47 48 #include <ctype.h> 49 #include <errno.h> 50 #include <fcntl.h> 51 #include <limits.h> 52 #include <regex.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <unistd.h> 57 58 #include "defs.h" 59 #include "extern.h" 60 61 static SPACE HS, PS, SS; 62 #define pd PS.deleted 63 #define ps PS.space 64 #define psl PS.len 65 #define hs HS.space 66 #define hsl HS.len 67 68 static inline int applies __P((struct s_command *)); 69 static void flush_appends __P((void)); 70 static void lputs __P((char *)); 71 static inline int regexec_e __P((regex_t *, const char *, int, int, size_t)); 72 static void regsub __P((SPACE *, char *, char *)); 73 static int substitute __P((struct s_command *)); 74 75 struct s_appends *appends; /* Array of pointers to strings to append. */ 76 static int appendx; /* Index into appends array. */ 77 int appendnum; /* Size of appends array. */ 78 79 static int lastaddr; /* Set by applies if last address of a range. */ 80 static int sdone; /* If any substitutes since last line input. */ 81 /* Iov structure for 'w' commands. */ 82 static regex_t *defpreg; 83 size_t maxnsub; 84 regmatch_t *match; 85 86 #define OUT(s) { fwrite(s, sizeof(u_char), psl, stdout); } 87 88 void 89 process() 90 { 91 struct s_command *cp; 92 SPACE tspace; 93 size_t len; 94 int r; 95 char oldc, *p; 96 97 for (linenum = 0; mf_fgets(&PS, REPLACE);) { 98 pd = 0; 99 cp = prog; 100 redirect: 101 while (cp != NULL) { 102 if (!applies(cp)) { 103 cp = cp->next; 104 continue; 105 } 106 switch (cp->code) { 107 case '{': 108 cp = cp->u.c; 109 goto redirect; 110 case 'a': 111 if (appendx >= appendnum) 112 appends = xrealloc(appends, 113 sizeof(struct s_appends) * 114 (appendnum *= 2)); 115 appends[appendx].type = AP_STRING; 116 appends[appendx].s = cp->t; 117 appends[appendx].len = strlen(cp->t); 118 appendx++; 119 break; 120 case 'b': 121 cp = cp->u.c; 122 goto redirect; 123 case 'c': 124 pd = 1; 125 psl = 0; 126 if (cp->a2 == NULL || lastaddr) 127 (void)printf("%s", cp->t); 128 break; 129 case 'd': 130 pd = 1; 131 goto new; 132 case 'D': 133 if (pd) 134 goto new; 135 if ((p = memchr(ps, '\n', psl)) == NULL) 136 pd = 1; 137 else { 138 psl -= (p + 1) - ps; 139 memmove(ps, p + 1, psl); 140 } 141 goto new; 142 case 'g': 143 cspace(&PS, hs, hsl, REPLACE); 144 break; 145 case 'G': 146 cspace(&PS, hs, hsl, 0); 147 break; 148 case 'h': 149 cspace(&HS, ps, psl, REPLACE); 150 break; 151 case 'H': 152 cspace(&HS, ps, psl, 0); 153 break; 154 case 'i': 155 (void)printf("%s", cp->t); 156 break; 157 case 'l': 158 lputs(ps); 159 break; 160 case 'n': 161 if (!nflag && !pd) 162 OUT(ps) 163 flush_appends(); 164 r = mf_fgets(&PS, REPLACE); 165 #ifndef NONHISTORIC_PRACTICE 166 if (!r) 167 exit(0); 168 #endif 169 pd = 0; 170 break; 171 case 'N': 172 flush_appends(); 173 if (!mf_fgets(&PS, 0)) { 174 if (!nflag && !pd) 175 OUT(ps) 176 exit(0); 177 } 178 break; 179 case 'p': 180 if (pd) 181 break; 182 OUT(ps) 183 break; 184 case 'P': 185 if (pd) 186 break; 187 if ((p = memchr(ps, '\n', psl)) != NULL) { 188 oldc = *p; 189 *p = '\0'; 190 } 191 OUT(ps) 192 if (p != NULL) 193 *p = oldc; 194 break; 195 case 'q': 196 if (!nflag && !pd) 197 OUT(ps) 198 flush_appends(); 199 exit(0); 200 case 'r': 201 if (appendx >= appendnum) 202 appends = xrealloc(appends, 203 sizeof(struct s_appends) * 204 (appendnum *= 2)); 205 appends[appendx].type = AP_FILE; 206 appends[appendx].s = cp->t; 207 appends[appendx].len = strlen(cp->t); 208 appendx++; 209 break; 210 case 's': 211 sdone |= substitute(cp); 212 break; 213 case 't': 214 if (sdone) { 215 sdone = 0; 216 cp = cp->u.c; 217 goto redirect; 218 } 219 break; 220 case 'w': 221 if (pd) 222 break; 223 if (cp->u.fd == -1 && (cp->u.fd = open(cp->t, 224 O_WRONLY|O_APPEND|O_CREAT|O_TRUNC, 225 DEFFILEMODE)) == -1) 226 err(FATAL, "%s: %s\n", 227 cp->t, strerror(errno)); 228 if (write(cp->u.fd, ps, psl) != psl) 229 err(FATAL, "%s: %s\n", 230 cp->t, strerror(errno)); 231 break; 232 case 'x': 233 if (hs == NULL) 234 cspace(&HS, "", 0, REPLACE); 235 tspace = PS; 236 PS = HS; 237 HS = tspace; 238 break; 239 case 'y': 240 if (pd) 241 break; 242 for (p = ps, len = psl; --len; ++p) 243 *p = cp->u.y[*p]; 244 break; 245 case ':': 246 case '}': 247 break; 248 case '=': 249 (void)printf("%lu\n", linenum); 250 } 251 cp = cp->next; 252 } /* for all cp */ 253 254 new: if (!nflag && !pd) 255 OUT(ps) 256 flush_appends(); 257 } /* for all lines */ 258 } 259 260 /* 261 * TRUE if the address passed matches the current program state 262 * (lastline, linenumber, ps). 263 */ 264 #define MATCH(a) \ 265 (a)->type == AT_RE ? regexec_e((a)->u.r, ps, 0, 1, psl) : \ 266 (a)->type == AT_LINE ? linenum == (a)->u.l : lastline 267 268 /* 269 * Return TRUE if the command applies to the current line. Sets the inrange 270 * flag to process ranges. Interprets the non-select (``!'') flag. 271 */ 272 static inline int 273 applies(cp) 274 struct s_command *cp; 275 { 276 int r; 277 278 lastaddr = 0; 279 if (cp->a1 == NULL && cp->a2 == NULL) 280 r = 1; 281 else if (cp->a2) 282 if (cp->inrange) { 283 if (MATCH(cp->a2)) { 284 cp->inrange = 0; 285 lastaddr = 1; 286 } 287 r = 1; 288 } else if (MATCH(cp->a1)) { 289 /* 290 * If the second address is a number less than or 291 * equal to the line number first selected, only 292 * one line shall be selected. 293 * -- POSIX 1003.2 294 */ 295 if (cp->a2->type == AT_LINE && 296 linenum >= cp->a2->u.l) 297 lastaddr = 1; 298 else 299 cp->inrange = 1; 300 r = 1; 301 } else 302 r = 0; 303 else 304 r = MATCH(cp->a1); 305 return (cp->nonsel ? ! r : r); 306 } 307 308 /* 309 * substitute -- 310 * Do substitutions in the pattern space. Currently, we build a 311 * copy of the new pattern space in the substitute space structure 312 * and then swap them. 313 */ 314 static int 315 substitute(cp) 316 struct s_command *cp; 317 { 318 SPACE tspace; 319 regex_t *re; 320 size_t re_off, slen; 321 int n, lastempty; 322 char *s; 323 324 s = ps; 325 re = cp->u.s->re; 326 if (re == NULL) { 327 if (defpreg != NULL && cp->u.s->maxbref > defpreg->re_nsub) { 328 linenum = cp->u.s->linenum; 329 err(COMPILE, "\\%d not defined in the RE", 330 cp->u.s->maxbref); 331 } 332 } 333 if (!regexec_e(re, s, 0, 0, psl)) 334 return (0); 335 336 SS.len = 0; /* Clean substitute space. */ 337 slen = psl; 338 n = cp->u.s->n; 339 lastempty = 1; 340 341 switch (n) { 342 case 0: /* Global */ 343 do { 344 if (lastempty || match[0].rm_so != match[0].rm_eo) { 345 /* Locate start of replaced string. */ 346 re_off = match[0].rm_so; 347 /* Copy leading retained string. */ 348 cspace(&SS, s, re_off, APPEND); 349 /* Add in regular expression. */ 350 regsub(&SS, s, cp->u.s->new); 351 } 352 353 /* Move past this match. */ 354 if (match[0].rm_so != match[0].rm_eo) { 355 s += match[0].rm_eo; 356 slen -= match[0].rm_eo; 357 lastempty = 0; 358 } else { 359 if (match[0].rm_so == 0) 360 cspace(&SS, s, match[0].rm_so + 1, 361 APPEND); 362 else 363 cspace(&SS, s + match[0].rm_so, 1, 364 APPEND); 365 s += match[0].rm_so + 1; 366 slen -= match[0].rm_so + 1; 367 lastempty = 1; 368 } 369 } while (slen > 0 && regexec_e(re, s, REG_NOTBOL, 0, slen)); 370 /* Copy trailing retained string. */ 371 if (slen > 0) 372 cspace(&SS, s, slen, APPEND); 373 break; 374 default: /* Nth occurrence */ 375 while (--n) { 376 s += match[0].rm_eo; 377 slen -= match[0].rm_eo; 378 if (!regexec_e(re, s, REG_NOTBOL, 0, slen)) 379 return (0); 380 } 381 /* FALLTHROUGH */ 382 case 1: /* 1st occurrence */ 383 /* Locate start of replaced string. */ 384 re_off = match[0].rm_so + (s - ps); 385 /* Copy leading retained string. */ 386 cspace(&SS, ps, re_off, APPEND); 387 /* Add in regular expression. */ 388 regsub(&SS, s, cp->u.s->new); 389 /* Copy trailing retained string. */ 390 s += match[0].rm_eo; 391 slen -= match[0].rm_eo; 392 cspace(&SS, s, slen, APPEND); 393 break; 394 } 395 396 /* 397 * Swap the substitute space and the pattern space, and make sure 398 * that any leftover pointers into stdio memory get lost. 399 */ 400 tspace = PS; 401 PS = SS; 402 SS = tspace; 403 SS.space = SS.back; 404 405 /* Handle the 'p' flag. */ 406 if (cp->u.s->p) 407 OUT(ps) 408 409 /* Handle the 'w' flag. */ 410 if (cp->u.s->wfile && !pd) { 411 if (cp->u.s->wfd == -1 && (cp->u.s->wfd = open(cp->u.s->wfile, 412 O_WRONLY|O_APPEND|O_CREAT|O_TRUNC, DEFFILEMODE)) == -1) 413 err(FATAL, "%s: %s\n", cp->u.s->wfile, strerror(errno)); 414 if (write(cp->u.s->wfd, ps, psl) != psl) 415 err(FATAL, "%s: %s\n", cp->u.s->wfile, strerror(errno)); 416 } 417 return (1); 418 } 419 420 /* 421 * Flush append requests. Always called before reading a line, 422 * therefore it also resets the substitution done (sdone) flag. 423 */ 424 static void 425 flush_appends() 426 { 427 FILE *f; 428 int count, i; 429 char buf[8 * 1024]; 430 431 for (i = 0; i < appendx; i++) 432 switch (appends[i].type) { 433 case AP_STRING: 434 fwrite(appends[i].s, sizeof(char), appends[i].len, 435 stdout); 436 break; 437 case AP_FILE: 438 /* 439 * Read files probably shouldn't be cached. Since 440 * it's not an error to read a non-existent file, 441 * it's possible that another program is interacting 442 * with the sed script through the file system. It 443 * would be truly bizarre, but possible. It's probably 444 * not that big a performance win, anyhow. 445 */ 446 if ((f = fopen(appends[i].s, "r")) == NULL) 447 break; 448 while (count = fread(buf, sizeof(char), sizeof(buf), f)) 449 (void)fwrite(buf, sizeof(char), count, stdout); 450 (void)fclose(f); 451 break; 452 } 453 if (ferror(stdout)) 454 err(FATAL, "stdout: %s", strerror(errno ? errno : EIO)); 455 appendx = sdone = 0; 456 } 457 458 static void 459 lputs(s) 460 register char *s; 461 { 462 register int count; 463 register char *escapes, *p; 464 struct winsize win; 465 static int termwidth = -1; 466 467 if (termwidth == -1) 468 if (p = getenv("COLUMNS")) 469 termwidth = atoi(p); 470 else if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) == 0 && 471 win.ws_col > 0) 472 termwidth = win.ws_col; 473 else 474 termwidth = 60; 475 476 for (count = 0; *s; ++s) { 477 if (count >= termwidth) { 478 (void)printf("\\\n"); 479 count = 0; 480 } 481 if (isascii(*s) && isprint(*s) && *s != '\\') { 482 (void)putchar(*s); 483 count++; 484 } else { 485 escapes = "\\\a\b\f\n\r\t\v"; 486 (void)putchar('\\'); 487 if (p = strchr(escapes, *s)) { 488 (void)putchar("\\abfnrtv"[p - escapes]); 489 count += 2; 490 } else { 491 (void)printf("%03o", *(u_char *)s); 492 count += 4; 493 } 494 } 495 } 496 (void)putchar('$'); 497 (void)putchar('\n'); 498 if (ferror(stdout)) 499 err(FATAL, "stdout: %s", strerror(errno ? errno : EIO)); 500 } 501 502 static inline int 503 regexec_e(preg, string, eflags, nomatch, slen) 504 regex_t *preg; 505 const char *string; 506 int eflags, nomatch; 507 size_t slen; 508 { 509 int eval; 510 511 if (preg == NULL) { 512 if (defpreg == NULL) 513 err(FATAL, "first RE may not be empty"); 514 } else 515 defpreg = preg; 516 517 /* Set anchors, discounting trailing newline (if any). */ 518 if (slen > 0 && string[slen - 1] == '\n') 519 slen--; 520 match[0].rm_so = 0; 521 match[0].rm_eo = slen; 522 523 eval = regexec(defpreg, string, 524 nomatch ? 0 : maxnsub + 1, match, eflags | REG_STARTEND); 525 switch(eval) { 526 case 0: 527 return (1); 528 case REG_NOMATCH: 529 return (0); 530 } 531 err(FATAL, "RE error: %s", strregerror(eval, defpreg)); 532 /* NOTREACHED */ 533 } 534 535 /* 536 * regsub - perform substitutions after a regexp match 537 * Based on a routine by Henry Spencer 538 */ 539 static void 540 regsub(sp, string, src) 541 SPACE *sp; 542 char *string, *src; 543 { 544 register int len, no; 545 register char c, *dst; 546 547 #define NEEDSP(reqlen) \ 548 if (sp->len >= sp->blen - (reqlen) - 1) { \ 549 sp->blen += (reqlen) + 1024; \ 550 sp->space = sp->back = xrealloc(sp->back, sp->blen); \ 551 dst = sp->space + sp->len; \ 552 } 553 554 dst = sp->space + sp->len; 555 while ((c = *src++) != '\0') { 556 if (c == '&') 557 no = 0; 558 else if (c == '\\' && isdigit(*src)) 559 no = *src++ - '0'; 560 else 561 no = -1; 562 if (no < 0) { /* Ordinary character. */ 563 if (c == '\\' && (*src == '\\' || *src == '&')) 564 c = *src++; 565 NEEDSP(1); 566 *dst++ = c; 567 ++sp->len; 568 } else if (match[no].rm_so != -1 && match[no].rm_eo != -1) { 569 len = match[no].rm_eo - match[no].rm_so; 570 NEEDSP(len); 571 memmove(dst, string + match[no].rm_so, len); 572 dst += len; 573 sp->len += len; 574 } 575 } 576 NEEDSP(1); 577 *dst = '\0'; 578 } 579 580 /* 581 * aspace -- 582 * Append the source space to the destination space, allocating new 583 * space as necessary. 584 */ 585 void 586 cspace(sp, p, len, spflag) 587 SPACE *sp; 588 char *p; 589 size_t len; 590 enum e_spflag spflag; 591 { 592 size_t tlen; 593 594 /* Make sure SPACE has enough memory and ramp up quickly. */ 595 tlen = sp->len + len + 1; 596 if (tlen > sp->blen) { 597 sp->blen = tlen + 1024; 598 sp->space = sp->back = xrealloc(sp->back, sp->blen); 599 } 600 601 if (spflag == REPLACE) 602 sp->len = 0; 603 604 memmove(sp->space + sp->len, p, len); 605 606 sp->space[sp->len += len] = '\0'; 607 } 608 609 /* 610 * Close all cached opened files and report any errors 611 */ 612 void 613 cfclose(cp, end) 614 register struct s_command *cp, *end; 615 { 616 617 for (; cp != end; cp = cp->next) 618 switch(cp->code) { 619 case 's': 620 if (cp->u.s->wfd != -1 && close(cp->u.s->wfd)) 621 err(FATAL, 622 "%s: %s", cp->u.s->wfile, strerror(errno)); 623 cp->u.s->wfd = -1; 624 break; 625 case 'w': 626 if (cp->u.fd != -1 && close(cp->u.fd)) 627 err(FATAL, "%s: %s", cp->t, strerror(errno)); 628 cp->u.fd = -1; 629 break; 630 case '{': 631 cfclose(cp->u.c, cp->next); 632 break; 633 } 634 } 635