usr.bin/sort/sort.c

   1 /*      $NetBSD: sort.c,v 1.55 2009/09/10 22:02:40 dsl Exp $    */
   2
   3 /*-
   4  * Copyright (c) 2000-2003 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Ben Harris and Jaromir Dolecek.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 /*-
  33  * Copyright (c) 1993
  34  *      The Regents of the University of California.  All rights reserved.
  35  *
  36  * This code is derived from software contributed to Berkeley by
  37  * Peter McIlroy.
  38  *
  39  * Redistribution and use in source and binary forms, with or without
  40  * modification, are permitted provided that the following conditions
  41  * are met:
  42  * 1. Redistributions of source code must retain the above copyright
  43  *    notice, this list of conditions and the following disclaimer.
  44  * 2. Redistributions in binary form must reproduce the above copyright
  45  *    notice, this list of conditions and the following disclaimer in the
  46  *    documentation and/or other materials provided with the distribution.
  47  * 3. Neither the name of the University nor the names of its contributors
  48  *    may be used to endorse or promote products derived from this software
  49  *    without specific prior written permission.
  50  *
  51  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  52  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  53  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  54  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  55  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  56  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  57  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  58  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  59  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  60  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  61  * SUCH DAMAGE.
  62  */
  63
  64 /* Sort sorts a file using an optional user-defined key.
  65  * Sort uses radix sort for internal sorting, and allows
  66  * a choice of merge sort and radix sort for external sorting.
  67  */
  68
  69 #include <util.h>
  70 #include "sort.h"
  71 #include "fsort.h"
  72 #include "pathnames.h"
  73
  74 #ifndef lint
  75 __COPYRIGHT("@(#) Copyright (c) 1993\
  76  The Regents of the University of California.  All rights reserved.");
  77 #endif /* not lint */
  78
  79 #ifndef lint
  80 __RCSID("$NetBSD: sort.c,v 1.55 2009/09/10 22:02:40 dsl Exp $");
  81 __SCCSID("@(#)sort.c    8.1 (Berkeley) 6/6/93");
  82 #endif /* not lint */
  83
  84 #include <sys/types.h>
  85 #include <sys/time.h>
  86 #include <sys/resource.h>
  87
  88 #include <paths.h>
  89 #include <signal.h>
  90 #include <stdlib.h>
  91 #include <string.h>
  92 #include <unistd.h>
  93 #include <locale.h>
  94
  95 int REC_D = '\n';
  96 u_char d_mask[NBINS];           /* flags for rec_d, field_d, <blank> */
  97
  98 /*
  99  * weight tables.  Gweights is one of ascii, Rascii..
 100  * modified to weight rec_d = 0 (or 255)
 101  */
 102 u_char *const weight_tables[4] = { ascii, Rascii, Ftable, RFtable };
 103 u_char ascii[NBINS], Rascii[NBINS], RFtable[NBINS], Ftable[NBINS];
 104
 105 int SINGL_FLD = 0, SEP_FLAG = 0, UNIQUE = 0;
 106 int REVERSE = 0;
 107 int posix_sort;
 108
 109 unsigned int debug_flags = 0;
 110
 111 static char toutpath[MAXPATHLEN];
 112
 113 const char *tmpdir;     /* where temporary files should be put */
 114
 115 static void cleanup(void);
 116 static void onsignal(int);
 117 static void usage(const char *);
 118
 119 int main(int argc, char **argv);
 120
 121 int
 122 main(int argc, char *argv[])
 123 {
 124         int ch, i, stdinflag = 0;
 125         char cflag = 0, mflag = 0;
 126         char *outfile, *outpath = 0;
 127         struct field *fldtab;
 128         size_t fldtab_sz, fld_cnt;
 129         struct filelist filelist;
 130         int num_input_files;
 131         FILE *outfp = NULL;
 132         struct rlimit rl;
 133         struct stat st;
 134
 135         setlocale(LC_ALL, "");
 136
 137         /* bump RLIMIT_NOFILE to maximum our hard limit allows */
 138         if (getrlimit(RLIMIT_NOFILE, &rl) < 0)
 139                 err(2, "getrlimit");
 140         rl.rlim_cur = rl.rlim_max;
 141         if (setrlimit(RLIMIT_NOFILE, &rl) < 0)
 142                 err(2, "setrlimit");
 143
 144         d_mask[REC_D = '\n'] = REC_D_F;
 145         d_mask['\t'] = d_mask[' '] = BLANK | FLD_D;
 146
 147         /* fldtab[0] is the global options. */
 148         fldtab_sz = 3;
 149         fld_cnt = 0;
 150         fldtab = emalloc(fldtab_sz * sizeof(*fldtab));
 151         memset(fldtab, 0, fldtab_sz * sizeof(*fldtab));
 152
 153         /* Convert "+field" args to -f format */
 154         fixit(&argc, argv);
 155
 156         if (!(tmpdir = getenv("TMPDIR")))
 157                 tmpdir = _PATH_TMP;
 158
 159         while ((ch = getopt(argc, argv, "bcdD:fik:mHno:rR:sSt:T:ux")) != -1) {
 160                 switch (ch) {
 161                 case 'b':
 162                         fldtab[0].flags |= BI | BT;
 163                         break;
 164                 case 'c':
 165                         cflag = 1;
 166                         break;
 167                 case 'D': /* Debug flags */
 168                         for (i = 0; optarg[i]; i++)
 169                             debug_flags |= 1 << (optarg[i] & 31);
 170                         break;
 171                 case 'd': case 'f': case 'i': case 'n':
 172                         fldtab[0].flags |= optval(ch, 0);
 173                         break;
 174                 case 'H':
 175                         /* -H was ; use merge sort for blocks of large files' */
 176                         /* That is now the default. */
 177                         break;
 178                 case 'k':
 179                         fldtab = erealloc(fldtab, (fldtab_sz + 1) * sizeof(*fldtab));
 180                         memset(&fldtab[fldtab_sz], 0, sizeof(fldtab[0]));
 181                         fldtab_sz++;
 182
 183                         setfield(optarg, &fldtab[++fld_cnt], fldtab[0].flags);
 184                         break;
 185                 case 'm':
 186                         mflag = 1;
 187                         break;
 188                 case 'o':
 189                         outpath = optarg;
 190                         break;
 191                 case 'r':
 192                         REVERSE = 1;
 193                         break;
 194                 case 's':
 195                         /*
 196                          * Nominally 'stable sort', keep lines with equal keys
 197                          * in input file order. (Default for NetBSD)
 198                          * (-s for GNU sort compatibility.)
 199                          */
 200                         posix_sort = 0;
 201                         break;
 202                 case 'S':
 203                         /*
 204                          * Reverse of -s!
 205                          * This needs to enforce a POSIX sort where records
 206                          * with equal keys are then sorted by the raw data.
 207                          * Currently not implemented!
 208                          * (using libc radixsort() v sradixsort() doesn't
 209                          * have the desired effect.)
 210                          */
 211                         posix_sort = 1;
 212                         break;
 213                 case 't':
 214                         if (SEP_FLAG)
 215                                 usage("multiple field delimiters");
 216                         SEP_FLAG = 1;
 217                         d_mask[' '] &= ~FLD_D;
 218                         d_mask['\t'] &= ~FLD_D;
 219                         d_mask[(u_char)*optarg] |= FLD_D;
 220                         if (d_mask[(u_char)*optarg] & REC_D_F)
 221                                 errx(2, "record/field delimiter clash");
 222                         break;
 223                 case 'R':
 224                         if (REC_D != '\n')
 225                                 usage("multiple record delimiters");
 226                         REC_D = *optarg;
 227                         if (REC_D == '\n')
 228                                 break;
 229                         if (optarg[1] != '\0') {
 230                                 char *ep;
 231                                 int t = 0;
 232                                 if (optarg[0] == '\\')
 233                                         optarg++, t = 8;
 234                                 REC_D = (int)strtol(optarg, &ep, t);
 235                                 if (*ep != '\0' || REC_D < 0 ||
 236                                     REC_D >= (int)__arraycount(d_mask))
 237                                         errx(2, "invalid record delimiter %s",
 238                                             optarg);
 239                         }
 240                         d_mask['\n'] = d_mask[' '];
 241                         d_mask[REC_D] = REC_D_F;
 242                         break;
 243                 case 'T':
 244                         /* -T tmpdir */
 245                         tmpdir = optarg;
 246                         break;
 247                 case 'u':
 248                         UNIQUE = 1;
 249                         break;
 250                 case '?':
 251                 default:
 252                         usage(NULL);
 253                 }
 254         }
 255
 256         if (UNIQUE)
 257                 /* Don't sort on raw record if keys match */
 258                 posix_sort = 0;
 259
 260         if (cflag && argc > optind+1)
 261                 errx(2, "too many input files for -c option");
 262         if (argc - 2 > optind && !strcmp(argv[argc-2], "-o")) {
 263                 outpath = argv[argc-1];
 264                 argc -= 2;
 265         }
 266         if (mflag && argc - optind > (MAXFCT - (16+1))*16)
 267                 errx(2, "too many input files for -m option");
 268
 269         for (i = optind; i < argc; i++) {
 270                 /* allow one occurrence of /dev/stdin */
 271                 if (!strcmp(argv[i], "-") || !strcmp(argv[i], _PATH_STDIN)) {
 272                         if (stdinflag)
 273                                 warnx("ignoring extra \"%s\" in file list",
 274                                     argv[i]);
 275                         else
 276                                 stdinflag = 1;
 277
 278                         /* change to /dev/stdin if '-' */
 279                         if (argv[i][0] == '-') {
 280                                 static char path_stdin[] = _PATH_STDIN;
 281                                 argv[i] = path_stdin;
 282                         }
 283
 284                 } else if ((ch = access(argv[i], R_OK)))
 285                         err(2, "%s", argv[i]);
 286         }
 287
 288         if (fldtab[1].icol.num == 0) {
 289                 /* No sort key specified */
 290                 if (fldtab[0].flags & (I|D|F|N)) {
 291                         /* Modified - generate a key that covers the line */
 292                         fldtab[0].flags &= ~(BI|BT);
 293                         setfield("1", &fldtab[++fld_cnt], fldtab->flags);
 294                         fldreset(fldtab);
 295                 } else {
 296                         /* Unmodified, just compare the line */
 297                         SINGL_FLD = 1;
 298                         fldtab[0].icol.num = 1;
 299                 }
 300         } else {
 301                 fldreset(fldtab);
 302         }
 303
 304         settables();
 305
 306         if (optind == argc) {
 307                 static const char * const names[] = { _PATH_STDIN, NULL };
 308                 filelist.names = names;
 309                 num_input_files = 1;
 310         } else {
 311                 filelist.names = (const char * const *) &argv[optind];
 312                 num_input_files = argc - optind;
 313         }
 314
 315         if (cflag) {
 316                 order(&filelist, fldtab);
 317                 /* NOT REACHED */
 318         }
 319
 320         if (!outpath) {
 321                 toutpath[0] = '\0';     /* path not used in this case */
 322                 outfile = outpath = toutpath;
 323                 outfp = stdout;
 324         } else if (lstat(outpath, &st) == 0
 325             && !S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) {
 326                 /* output file exists and isn't character or block device */
 327                 struct sigaction act;
 328                 static const int sigtable[] = {SIGHUP, SIGINT, SIGPIPE,
 329                     SIGXCPU, SIGXFSZ, SIGVTALRM, SIGPROF, 0};
 330                 int outfd;
 331                 errno = 0;
 332                 if (access(outpath, W_OK))
 333                         err(2, "%s", outpath);
 334                 (void)snprintf(toutpath, sizeof(toutpath), "%sXXXXXX",
 335                     outpath);
 336                 if ((outfd = mkstemp(toutpath)) == -1)
 337                         err(2, "Cannot create temporary file `%s'", toutpath);
 338                 (void)atexit(cleanup);
 339                 act.sa_handler = onsignal;
 340                 (void) sigemptyset(&act.sa_mask);
 341                 act.sa_flags = SA_RESTART | SA_RESETHAND;
 342                 for (i = 0; sigtable[i]; ++i)   /* always unlink toutpath */
 343                         sigaction(sigtable[i], &act, 0);
 344                 outfile = toutpath;
 345                 if ((outfp = fdopen(outfd, "w")) == NULL)
 346                         err(2, "Cannot open temporary file `%s'", toutpath);
 347         } else {
 348                 outfile = outpath;
 349
 350                 if ((outfp = fopen(outfile, "w")) == NULL)
 351                         err(2, "output file %s", outfile);
 352         }
 353
 354         if (mflag)
 355                 fmerge(&filelist, num_input_files, outfp, fldtab);
 356         else
 357                 fsort(&filelist, num_input_files, outfp, fldtab);
 358
 359         if (outfile != outpath) {
 360                 if (access(outfile, F_OK))
 361                         err(2, "%s", outfile);
 362
 363                 /*
 364                  * Copy file permissions bits of the original file.
 365                  * st is initialized above, when we create the
 366                  * temporary spool file.
 367                  */
 368                 if (lchmod(outfile, st.st_mode & ALLPERMS) != 0) {
 369                         err(2, "cannot chmod %s: output left in %s",
 370                             outpath, outfile);
 371                 }
 372
 373                 (void)unlink(outpath);
 374                 if (link(outfile, outpath))
 375                         err(2, "cannot link %s: output left in %s",
 376                             outpath, outfile);
 377                 (void)unlink(outfile);
 378                 toutpath[0] = 0;
 379         }
 380         exit(0);
 381 }
 382
 383 static void
 384 onsignal(int sig)
 385 {
 386         cleanup();
 387 }
 388
 389 static void
 390 cleanup(void)
 391 {
 392         if (toutpath[0])
 393                 (void)unlink(toutpath);
 394 }
 395
 396 static void
 397 usage(const char *msg)
 398 {
 399         if (msg != NULL)
 400                 (void)fprintf(stderr, "%s: %s\n", getprogname(), msg);
 401         (void)fprintf(stderr,
 402             "usage: %s [-bcdfHimnrSsu] [-k field1[,field2]] [-o output]"
 403             " [-R char] [-T dir]", getprogname());
 404         (void)fprintf(stderr,
 405             "             [-t char] [file ...]\n");
 406         exit(2);
 407 }