join.c revision 1590
1/*- 2 * Copyright (c) 1991, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Steve Hayman of the Computer Science Department, Indiana University, 7 * Michiro Hikida and David Goodenough. 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 39static char copyright[] = 40"@(#) Copyright (c) 1991, 1993, 1994\n\ 41 The Regents of the University of California. All rights reserved.\n"; 42#endif /* not lint */ 43 44#ifndef lint 45static char sccsid[] = "@(#)join.c 8.3 (Berkeley) 4/16/94"; 46#endif /* not lint */ 47 48#include <sys/param.h> 49 50#include <ctype.h> 51#include <err.h> 52#include <errno.h> 53#include <stdio.h> 54#include <stdlib.h> 55#include <string.h> 56 57/* 58 * There's a structure per input file which encapsulates the state of the 59 * file. We repeatedly read lines from each file until we've read in all 60 * the consecutive lines from the file with a common join field. Then we 61 * compare the set of lines with an equivalent set from the other file. 62 */ 63typedef struct { 64 char *line; /* line */ 65 u_long linealloc; /* line allocated count */ 66 char **fields; /* line field(s) */ 67 u_long fieldcnt; /* line field(s) count */ 68 u_long fieldalloc; /* line field(s) allocated count */ 69} LINE; 70 71typedef struct { 72 FILE *fp; /* file descriptor */ 73 u_long joinf; /* join field (-1, -2, -j) */ 74 int unpair; /* output unpairable lines (-a) */ 75 int number; /* 1 for file 1, 2 for file 2 */ 76 77 LINE *set; /* set of lines with same field */ 78 int pushbool; /* if pushback is set */ 79 u_long pushback; /* line on the stack */ 80 u_long setcnt; /* set count */ 81 u_long setalloc; /* set allocated count */ 82} INPUT; 83INPUT input1 = { NULL, 0, 0, 1, NULL, 0, 0, 0, }, 84 input2 = { NULL, 0, 0, 2, NULL, 0, 0, 0, }; 85 86typedef struct { 87 u_long filenum; /* file number */ 88 u_long fieldno; /* field number */ 89} OLIST; 90OLIST *olist; /* output field list */ 91u_long olistcnt; /* output field list count */ 92u_long olistalloc; /* output field allocated count */ 93 94int joinout = 1; /* show lines with matched join fields (-v) */ 95int needsep; /* need separator character */ 96int spans = 1; /* span multiple delimiters (-t) */ 97char *empty; /* empty field replacement string (-e) */ 98char *tabchar = " \t"; /* delimiter characters (-t) */ 99 100int cmp __P((LINE *, u_long, LINE *, u_long)); 101void fieldarg __P((char *)); 102void joinlines __P((INPUT *, INPUT *)); 103void obsolete __P((char **)); 104void outfield __P((LINE *, u_long, int)); 105void outoneline __P((INPUT *, LINE *)); 106void outtwoline __P((INPUT *, LINE *, INPUT *, LINE *)); 107void slurp __P((INPUT *)); 108void usage __P((void)); 109 110int 111main(argc, argv) 112 int argc; 113 char *argv[]; 114{ 115 INPUT *F1, *F2; 116 int aflag, ch, cval, vflag; 117 char *end; 118 119 F1 = &input1; 120 F2 = &input2; 121 122 aflag = vflag = 0; 123 obsolete(argv); 124 while ((ch = getopt(argc, argv, "\01a:e:j:1:2:o:t:v:")) != EOF) { 125 switch (ch) { 126 case '\01': /* See comment in obsolete(). */ 127 aflag = 1; 128 F1->unpair = F2->unpair = 1; 129 break; 130 case '1': 131 if ((F1->joinf = strtol(optarg, &end, 10)) < 1) 132 errx(1, "-1 option field number less than 1"); 133 if (*end) 134 errx(1, "illegal field number -- %s", optarg); 135 --F1->joinf; 136 break; 137 case '2': 138 if ((F2->joinf = strtol(optarg, &end, 10)) < 1) 139 errx(1, "-2 option field number less than 1"); 140 if (*end) 141 errx(1, "illegal field number -- %s", optarg); 142 --F2->joinf; 143 break; 144 case 'a': 145 aflag = 1; 146 switch(strtol(optarg, &end, 10)) { 147 case 1: 148 F1->unpair = 1; 149 break; 150 case 2: 151 F2->unpair = 1; 152 break; 153 default: 154 errx(1, "-a option file number not 1 or 2"); 155 break; 156 } 157 if (*end) 158 errx(1, "illegal file number -- %s", optarg); 159 break; 160 case 'e': 161 empty = optarg; 162 break; 163 case 'j': 164 if ((F1->joinf = F2->joinf = 165 strtol(optarg, &end, 10)) < 1) 166 errx(1, "-j option field number less than 1"); 167 if (*end) 168 errx(1, "illegal field number -- %s", optarg); 169 --F1->joinf; 170 --F2->joinf; 171 break; 172 case 'o': 173 fieldarg(optarg); 174 break; 175 case 't': 176 spans = 0; 177 if (strlen(tabchar = optarg) != 1) 178 errx(1, "illegal tab character specification"); 179 break; 180 case 'v': 181 vflag = 1; 182 joinout = 0; 183 switch (strtol(optarg, &end, 10)) { 184 case 1: 185 F1->unpair = 1; 186 break; 187 case 2: 188 F2->unpair = 1; 189 break; 190 default: 191 errx(1, "-v option file number not 1 or 2"); 192 break; 193 } 194 if (*end) 195 errx(1, "illegal file number -- %s", optarg); 196 break; 197 case '?': 198 default: 199 usage(); 200 } 201 } 202 argc -= optind; 203 argv += optind; 204 205 if (aflag && vflag) 206 errx(1, "the -a and -v options are mutually exclusive"); 207 208 if (argc != 2) 209 usage(); 210 211 /* Open the files; "-" means stdin. */ 212 if (!strcmp(*argv, "-")) 213 F1->fp = stdin; 214 else if ((F1->fp = fopen(*argv, "r")) == NULL) 215 err(1, "%s", *argv); 216 ++argv; 217 if (!strcmp(*argv, "-")) 218 F2->fp = stdin; 219 else if ((F2->fp = fopen(*argv, "r")) == NULL) 220 err(1, "%s", *argv); 221 if (F1->fp == stdin && F2->fp == stdin) 222 errx(1, "only one input file may be stdin"); 223 224 slurp(F1); 225 slurp(F2); 226 while (F1->setcnt && F2->setcnt) { 227 cval = cmp(F1->set, F1->joinf, F2->set, F2->joinf); 228 if (cval == 0) { 229 /* Oh joy, oh rapture, oh beauty divine! */ 230 if (joinout) 231 joinlines(F1, F2); 232 slurp(F1); 233 slurp(F2); 234 } else if (cval < 0) { 235 /* File 1 takes the lead... */ 236 if (F1->unpair) 237 joinlines(F1, NULL); 238 slurp(F1); 239 } else { 240 /* File 2 takes the lead... */ 241 if (F2->unpair) 242 joinlines(F2, NULL); 243 slurp(F2); 244 } 245 } 246 247 /* 248 * Now that one of the files is used up, optionally output any 249 * remaining lines from the other file. 250 */ 251 if (F1->unpair) 252 while (F1->setcnt) { 253 joinlines(F1, NULL); 254 slurp(F1); 255 } 256 if (F2->unpair) 257 while (F2->setcnt) { 258 joinlines(F2, NULL); 259 slurp(F2); 260 } 261 exit(0); 262} 263 264void 265slurp(F) 266 INPUT *F; 267{ 268 LINE *lp, *lastlp, tmp; 269 size_t len; 270 int cnt; 271 char *bp, *fieldp; 272 273 /* 274 * Read all of the lines from an input file that have the same 275 * join field. 276 */ 277 F->setcnt = 0; 278 for (lastlp = NULL;; ++F->setcnt, lastlp = lp) { 279 /* 280 * If we're out of space to hold line structures, allocate 281 * more. Initialize the structure so that we know that this 282 * is new space. 283 */ 284 if (F->setcnt == F->setalloc) { 285 cnt = F->setalloc; 286 F->setalloc += 50; 287 if ((F->set = realloc(F->set, 288 F->setalloc * sizeof(LINE))) == NULL) 289 err(1, NULL); 290 memset(F->set + cnt, 0, 50 * sizeof(LINE)); 291 } 292 293 /* 294 * Get any pushed back line, else get the next line. Allocate 295 * space as necessary. If taking the line from the stack swap 296 * the two structures so that we don't lose space allocated to 297 * either structure. This could be avoided by doing another 298 * level of indirection, but it's probably okay as is. 299 * but it's probably okay as is. 300 */ 301 lp = &F->set[F->setcnt]; 302 if (F->pushbool) { 303 tmp = F->set[F->setcnt]; 304 F->set[F->setcnt] = F->set[F->pushback]; 305 F->set[F->pushback] = tmp; 306 F->pushbool = 0; 307 continue; 308 } 309 if ((bp = fgetln(F->fp, &len)) == NULL) 310 return; 311 if (lp->linealloc <= len + 1) { 312 lp->linealloc += MAX(100, len + 1); 313 if ((lp->line = 314 realloc(lp->line, lp->linealloc)) == NULL) 315 err(1, NULL); 316 } 317 memmove(lp->line, bp, len); 318 319 /* Replace trailing newline, if it exists. */ 320 if (bp[len - 1] == '\n') 321 lp->line[len - 1] = '\0'; 322 else 323 lp->line[len] = '\0'; 324 bp = lp->line; 325 326 /* Split the line into fields, allocate space as necessary. */ 327 lp->fieldcnt = 0; 328 while ((fieldp = strsep(&bp, tabchar)) != NULL) { 329 if (spans && *fieldp == '\0') 330 continue; 331 if (lp->fieldcnt == lp->fieldalloc) { 332 lp->fieldalloc += 50; 333 if ((lp->fields = realloc(lp->fields, 334 lp->fieldalloc * sizeof(char *))) == NULL) 335 err(1, NULL); 336 } 337 lp->fields[lp->fieldcnt++] = fieldp; 338 } 339 340 /* See if the join field value has changed. */ 341 if (lastlp != NULL && cmp(lp, F->joinf, lastlp, F->joinf)) { 342 F->pushbool = 1; 343 F->pushback = F->setcnt; 344 break; 345 } 346 } 347} 348 349int 350cmp(lp1, fieldno1, lp2, fieldno2) 351 LINE *lp1, *lp2; 352 u_long fieldno1, fieldno2; 353{ 354 if (lp1->fieldcnt < fieldno1) 355 return (lp2->fieldcnt < fieldno2 ? 0 : 1); 356 if (lp2->fieldcnt < fieldno2) 357 return (-1); 358 return (strcmp(lp1->fields[fieldno1], lp2->fields[fieldno2])); 359} 360 361void 362joinlines(F1, F2) 363 INPUT *F1, *F2; 364{ 365 int cnt1, cnt2; 366 367 /* 368 * Output the results of a join comparison. The output may be from 369 * either file 1 or file 2 (in which case the first argument is the 370 * file from which to output) or from both. 371 */ 372 if (F2 == NULL) { 373 for (cnt1 = 0; cnt1 < F1->setcnt; ++cnt1) 374 outoneline(F1, &F1->set[cnt1]); 375 return; 376 } 377 for (cnt1 = 0; cnt1 < F1->setcnt; ++cnt1) 378 for (cnt2 = 0; cnt2 < F2->setcnt; ++cnt2) 379 outtwoline(F1, &F1->set[cnt1], F2, &F2->set[cnt2]); 380} 381 382void 383outoneline(F, lp) 384 INPUT *F; 385 LINE *lp; 386{ 387 int cnt; 388 389 /* 390 * Output a single line from one of the files, according to the 391 * join rules. This happens when we are writing unmatched single 392 * lines. Output empty fields in the right places. 393 */ 394 if (olist) 395 for (cnt = 0; cnt < olistcnt; ++cnt) { 396 if (olist[cnt].filenum == F->number) 397 outfield(lp, olist[cnt].fieldno, 0); 398 else 399 outfield(lp, 0, 1); 400 } 401 else 402 for (cnt = 0; cnt < lp->fieldcnt; ++cnt) 403 outfield(lp, cnt, 0); 404 (void)printf("\n"); 405 if (ferror(stdout)) 406 err(1, "stdout"); 407 needsep = 0; 408} 409 410void 411outtwoline(F1, lp1, F2, lp2) 412 INPUT *F1, *F2; 413 LINE *lp1, *lp2; 414{ 415 int cnt; 416 417 /* Output a pair of lines according to the join list (if any). */ 418 if (olist) 419 for (cnt = 0; cnt < olistcnt; ++cnt) 420 if (olist[cnt].filenum == 1) 421 outfield(lp1, olist[cnt].fieldno, 0); 422 else /* if (olist[cnt].filenum == 2) */ 423 outfield(lp2, olist[cnt].fieldno, 0); 424 else { 425 /* 426 * Output the join field, then the remaining fields from F1 427 * and F2. 428 */ 429 outfield(lp1, F1->joinf, 0); 430 for (cnt = 0; cnt < lp1->fieldcnt; ++cnt) 431 if (F1->joinf != cnt) 432 outfield(lp1, cnt, 0); 433 for (cnt = 0; cnt < lp2->fieldcnt; ++cnt) 434 if (F2->joinf != cnt) 435 outfield(lp2, cnt, 0); 436 } 437 (void)printf("\n"); 438 if (ferror(stdout)) 439 err(1, "stdout"); 440 needsep = 0; 441} 442 443void 444outfield(lp, fieldno, out_empty) 445 LINE *lp; 446 u_long fieldno; 447 int out_empty; 448{ 449 if (needsep++) 450 (void)printf("%c", *tabchar); 451 if (!ferror(stdout)) 452 if (lp->fieldcnt < fieldno || out_empty) { 453 if (empty != NULL) 454 (void)printf("%s", empty); 455 } else { 456 if (*lp->fields[fieldno] == '\0') 457 return; 458 (void)printf("%s", lp->fields[fieldno]); 459 } 460 if (ferror(stdout)) 461 err(1, "stdout"); 462} 463 464/* 465 * Convert an output list argument "2.1, 1.3, 2.4" into an array of output 466 * fields. 467 */ 468void 469fieldarg(option) 470 char *option; 471{ 472 u_long fieldno; 473 char *end, *token; 474 475 while ((token = strsep(&option, " \t")) != NULL) { 476 if (*token == '\0') 477 continue; 478 if (token[0] != '1' && token[0] != '2' || token[1] != '.') 479 errx(1, "malformed -o option field"); 480 fieldno = strtol(token + 2, &end, 10); 481 if (*end) 482 errx(1, "malformed -o option field"); 483 if (fieldno == 0) 484 errx(1, "field numbers are 1 based"); 485 if (olistcnt == olistalloc) { 486 olistalloc += 50; 487 if ((olist = realloc(olist, 488 olistalloc * sizeof(OLIST))) == NULL) 489 err(1, NULL); 490 } 491 olist[olistcnt].filenum = token[0] - '0'; 492 olist[olistcnt].fieldno = fieldno - 1; 493 ++olistcnt; 494 } 495} 496 497void 498obsolete(argv) 499 char **argv; 500{ 501 int len; 502 char **p, *ap, *t; 503 504 while ((ap = *++argv) != NULL) { 505 /* Return if "--". */ 506 if (ap[0] == '-' && ap[1] == '-') 507 return; 508 switch (ap[1]) { 509 case 'a': 510 /* 511 * The original join allowed "-a", which meant the 512 * same as -a1 plus -a2. POSIX 1003.2, Draft 11.2 513 * only specifies this as "-a 1" and "a -2", so we 514 * have to use another option flag, one that is 515 * unlikely to ever be used or accidentally entered 516 * on the command line. (Well, we could reallocate 517 * the argv array, but that hardly seems worthwhile.) 518 */ 519 if (ap[2] == '\0') 520 ap[1] = '\01'; 521 break; 522 case 'j': 523 /* 524 * The original join allowed "-j[12] arg" and "-j arg". 525 * Convert the former to "-[12] arg". Don't convert 526 * the latter since getopt(3) can handle it. 527 */ 528 switch(ap[2]) { 529 case '1': 530 if (ap[3] != '\0') 531 goto jbad; 532 ap[1] = '1'; 533 ap[2] = '\0'; 534 break; 535 case '2': 536 if (ap[3] != '\0') 537 goto jbad; 538 ap[1] = '2'; 539 ap[2] = '\0'; 540 break; 541 case '\0': 542 break; 543 default: 544jbad: errx(1, "illegal option -- %s", ap); 545 usage(); 546 } 547 break; 548 case 'o': 549 /* 550 * The original join allowed "-o arg arg". 551 * Convert to "-o arg -o arg". 552 */ 553 if (ap[2] != '\0') 554 break; 555 for (p = argv + 2; *p; ++p) { 556 if (p[0][0] != '1' && 557 p[0][0] != '2' || p[0][1] != '.') 558 break; 559 len = strlen(*p); 560 if (len - 2 != strspn(*p + 2, "0123456789")) 561 break; 562 if ((t = malloc(len + 3)) == NULL) 563 err(1, NULL); 564 t[0] = '-'; 565 t[1] = 'o'; 566 memmove(t + 2, *p, len + 1); 567 *p = t; 568 } 569 argv = p - 1; 570 break; 571 } 572 } 573} 574 575void 576usage() 577{ 578 (void)fprintf(stderr, "%s%s\n", 579 "usage: join [-a fileno | -v fileno ] [-e string] [-1 field] ", 580 "[-2 field]\n [-o list] [-t char] file1 file2"); 581 exit(1); 582} 583