usr.bin/sort/sort.c

   1 /*      $NetBSD: sort.c,v 1.56 2009/09/26 21:16:55 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 __RCSID("$NetBSD: sort.c,v 1.56 2009/09/26 21:16:55 dsl Exp $");
  80
  81 #include <sys/types.h>
  82 #include <sys/time.h>
  83 #include <sys/resource.h>
  84
  85 #include <paths.h>
  86 #include <signal.h>
  87 #include <stdlib.h>
  88 #include <string.h>
  89 #include <unistd.h>
  90 #include <locale.h>
  91
  92 int REC_D = '\n';
  93 u_char d_mask[NBINS];           /* flags for rec_d, field_d, <blank> */
  94
  95 /*
  96  * weight tables.  Gweights is one of ascii, Rascii..
  97  * modified to weight rec_d = 0 (or 255)
  98  */
  99 u_char *const weight_tables[4] = { ascii, Rascii, Ftable, RFtable };
 100 u_char ascii[NBINS], Rascii[NBINS], RFtable[NBINS], Ftable[NBINS];
 101
 102 int SINGL_FLD = 0, SEP_FLAG = 0, UNIQUE = 0;
 103 int REVERSE = 0;
 104 int posix_sort;
 105
 106 unsigned int debug_flags = 0;
 107
 108 static char toutpath[MAXPATHLEN];
 109
 110 const char *tmpdir;     /* where temporary files should be put */
 111
 112 static void cleanup(void);
 113 static void onsignal(int);
 114 static void usage(const char *);
 115
 116 int main(int argc, char **argv);
 117
 118 int
 119 main(int argc, char *argv[])
 120 {
 121         int ch, i, stdinflag = 0;
 122         char cflag = 0, mflag = 0;
 123         char *outfile, *outpath = 0;
 124         struct field *fldtab;
 125         size_t fldtab_sz, fld_cnt;
 126         struct filelist filelist;
 127         int num_input_files;
 128         FILE *outfp = NULL;
 129         struct rlimit rl;
 130         struct stat st;
 131
 132         setlocale(LC_ALL, "");
 133
 134         /* bump RLIMIT_NOFILE to maximum our hard limit allows */
 135         if (getrlimit(RLIMIT_NOFILE, &rl) < 0)
 136                 err(2, "getrlimit");
 137         rl.rlim_cur = rl.rlim_max;
 138         if (setrlimit(RLIMIT_NOFILE, &rl) < 0)
 139                 err(2, "setrlimit");
 140
 141         d_mask[REC_D = '\n'] = REC_D_F;
 142         d_mask['\t'] = d_mask[' '] = BLANK | FLD_D;
 143
 144         /* fldtab[0] is the global options. */
 145         fldtab_sz = 3;
 146         fld_cnt = 0;
 147         fldtab = emalloc(fldtab_sz * sizeof(*fldtab));
 148         memset(fldtab, 0, fldtab_sz * sizeof(*fldtab));
 149
 150         /* Convert "+field" args to -f format */
 151         fixit(&argc, argv);
 152
 153         if (!(tmpdir = getenv("TMPDIR")))
 154                 tmpdir = _PATH_TMP;
 155
 156         while ((ch = getopt(argc, argv, "bcdD:fik:mHno:rR:sSt:T:ux")) != -1) {
 157                 switch (ch) {
 158                 case 'b':
 159                         fldtab[0].flags |= BI | BT;
 160                         break;
 161                 case 'c':
 162                         cflag = 1;
 163                         break;
 164                 case 'D': /* Debug flags */
 165                         for (i = 0; optarg[i]; i++)
 166                             debug_flags |= 1 << (optarg[i] & 31);
 167                         break;
 168                 case 'd': case 'f': case 'i': case 'n':
 169                         fldtab[0].flags |= optval(ch, 0);
 170                         break;
 171                 case 'H':
 172                         /* -H was ; use merge sort for blocks of large files' */
 173                         /* That is now the default. */
 174                         break;
 175                 case 'k':
 176                         fldtab = erealloc(fldtab, (fldtab_sz + 1) * sizeof(*fldtab));
 177                         memset(&fldtab[fldtab_sz], 0, sizeof(fldtab[0]));
 178                         fldtab_sz++;
 179
 180                         setfield(optarg, &fldtab[++fld_cnt], fldtab[0].flags);
 181                         break;
 182                 case 'm':
 183                         mflag = 1;
 184                         break;
 185                 case 'o':
 186                         outpath = optarg;
 187                         break;
 188                 case 'r':
 189                         REVERSE = 1;
 190                         break;
 191                 case 's':
 192                         /*
 193                          * Nominally 'stable sort', keep lines with equal keys
 194                          * in input file order. (Default for NetBSD)
 195                          * (-s for GNU sort compatibility.)
 196                          */
 197                         posix_sort = 0;
 198                         break;
 199                 case 'S':
 200                         /*
 201                          * Reverse of -s!
 202                          * This needs to enforce a POSIX sort where records
 203                          * with equal keys are then sorted by the raw data.
 204                          * Currently not implemented!
 205                          * (using libc radixsort() v sradixsort() doesn't
 206                          * have the desired effect.)
 207                          */
 208                         posix_sort = 1;
 209                         break;
 210                 case 't':
 211                         if (SEP_FLAG)
 212                                 usage("multiple field delimiters");
 213                         SEP_FLAG = 1;
 214                         d_mask[' '] &= ~FLD_D;
 215                         d_mask['\t'] &= ~FLD_D;
 216                         d_mask[(u_char)*optarg] |= FLD_D;
 217                         if (d_mask[(u_char)*optarg] & REC_D_F)
 218                                 errx(2, "record/field delimiter clash");
 219                         break;
 220                 case 'R':
 221                         if (REC_D != '\n')
 222                                 usage("multiple record delimiters");
 223                         REC_D = *optarg;
 224                         if (REC_D == '\n')
 225                                 break;
 226                         if (optarg[1] != '\0') {
 227                                 char *ep;
 228                                 int t = 0;
 229                                 if (optarg[0] == '\\')
 230                                         optarg++, t = 8;
 231                                 REC_D = (int)strtol(optarg, &ep, t);
 232                                 if (*ep != '\0' || REC_D < 0 ||
 233                                     REC_D >= (int)__arraycount(d_mask))
 234                                         errx(2, "invalid record delimiter %s",
 235                                             optarg);
 236                         }
 237                         d_mask['\n'] = d_mask[' '];
 238                         d_mask[REC_D] = REC_D_F;
 239                         break;
 240                 case 'T':
 241                         /* -T tmpdir */
 242                         tmpdir = optarg;
 243                         break;
 244                 case 'u':
 245                         UNIQUE = 1;
 246                         break;
 247                 case '?':
 248                 default:
 249                         usage(NULL);
 250                 }
 251         }
 252
 253         if (UNIQUE)
 254                 /* Don't sort on raw record if keys match */
 255                 posix_sort = 0;
 256
 257         if (cflag && argc > optind+1)
 258                 errx(2, "too many input files for -c option");
 259         if (argc - 2 > optind && !strcmp(argv[argc-2], "-o")) {
 260                 outpath = argv[argc-1];
 261                 argc -= 2;
 262         }
 263         if (mflag && argc - optind > (MAXFCT - (16+1))*16)
 264                 errx(2, "too many input files for -m option");
 265
 266         for (i = optind; i < argc; i++) {
 267                 /* allow one occurrence of /dev/stdin */
 268                 if (!strcmp(argv[i], "-") || !strcmp(argv[i], _PATH_STDIN)) {
 269                         if (stdinflag)
 270                                 warnx("ignoring extra \"%s\" in file list",
 271                                     argv[i]);
 272                         else
 273                                 stdinflag = 1;
 274
 275                         /* change to /dev/stdin if '-' */
 276                         if (argv[i][0] == '-') {
 277                                 static char path_stdin[] = _PATH_STDIN;
 278                                 argv[i] = path_stdin;
 279                         }
 280
 281                 } else if ((ch = access(argv[i], R_OK)))
 282                         err(2, "%s", argv[i]);
 283         }
 284
 285         if (fldtab[1].icol.num == 0) {
 286                 /* No sort key specified */
 287                 if (fldtab[0].flags & (I|D|F|N)) {
 288                         /* Modified - generate a key that covers the line */
 289                         fldtab[0].flags &= ~(BI|BT);
 290                         setfield("1", &fldtab[++fld_cnt], fldtab->flags);
 291                         fldreset(fldtab);
 292                 } else {
 293                         /* Unmodified, just compare the line */
 294                         SINGL_FLD = 1;
 295                         fldtab[0].icol.num = 1;
 296                 }
 297         } else {
 298                 fldreset(fldtab);
 299         }
 300
 301         settables();
 302
 303         if (optind == argc) {
 304                 static const char * const names[] = { _PATH_STDIN, NULL };
 305                 filelist.names = names;
 306                 num_input_files = 1;
 307         } else {
 308                 filelist.names = (const char * const *) &argv[optind];
 309                 num_input_files = argc - optind;
 310         }
 311
 312         if (cflag) {
 313                 order(&filelist, fldtab);
 314                 /* NOT REACHED */
 315         }
 316
 317         if (!outpath) {
 318                 toutpath[0] = '\0';     /* path not used in this case */
 319                 outfile = outpath = toutpath;
 320                 outfp = stdout;
 321         } else if (lstat(outpath, &st) == 0
 322             && !S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) {
 323                 /* output file exists and isn't character or block device */
 324                 struct sigaction act;
 325                 static const int sigtable[] = {SIGHUP, SIGINT, SIGPIPE,
 326                     SIGXCPU, SIGXFSZ, SIGVTALRM, SIGPROF, 0};
 327                 int outfd;
 328                 errno = 0;
 329                 if (access(outpath, W_OK))
 330                         err(2, "%s", outpath);
 331                 (void)snprintf(toutpath, sizeof(toutpath), "%sXXXXXX",
 332                     outpath);
 333                 if ((outfd = mkstemp(toutpath)) == -1)
 334                         err(2, "Cannot create temporary file `%s'", toutpath);
 335                 (void)atexit(cleanup);
 336                 act.sa_handler = onsignal;
 337                 (void) sigemptyset(&act.sa_mask);
 338                 act.sa_flags = SA_RESTART | SA_RESETHAND;
 339                 for (i = 0; sigtable[i]; ++i)   /* always unlink toutpath */
 340                         sigaction(sigtable[i], &act, 0);
 341                 outfile = toutpath;
 342                 if ((outfp = fdopen(outfd, "w")) == NULL)
 343                         err(2, "Cannot open temporary file `%s'", toutpath);
 344         } else {
 345                 outfile = outpath;
 346
 347                 if ((outfp = fopen(outfile, "w")) == NULL)
 348                         err(2, "output file %s", outfile);
 349         }
 350
 351         if (mflag)
 352                 fmerge(&filelist, num_input_files, outfp, fldtab);
 353         else
 354                 fsort(&filelist, num_input_files, outfp, fldtab);
 355
 356         if (outfile != outpath) {
 357                 if (access(outfile, F_OK))
 358                         err(2, "%s", outfile);
 359
 360                 /*
 361                  * Copy file permissions bits of the original file.
 362                  * st is initialized above, when we create the
 363                  * temporary spool file.
 364                  */
 365                 if (lchmod(outfile, st.st_mode & ALLPERMS) != 0) {
 366                         err(2, "cannot chmod %s: output left in %s",
 367                             outpath, outfile);
 368                 }
 369
 370                 (void)unlink(outpath);
 371                 if (link(outfile, outpath))
 372                         err(2, "cannot link %s: output left in %s",
 373                             outpath, outfile);
 374                 (void)unlink(outfile);
 375                 toutpath[0] = 0;
 376         }
 377         exit(0);
 378 }
 379
 380 static void
 381 onsignal(int sig)
 382 {
 383         cleanup();
 384 }
 385
 386 static void
 387 cleanup(void)
 388 {
 389         if (toutpath[0])
 390                 (void)unlink(toutpath);
 391 }
 392
 393 static void
 394 usage(const char *msg)
 395 {
 396         if (msg != NULL)
 397                 (void)fprintf(stderr, "%s: %s\n", getprogname(), msg);
 398         (void)fprintf(stderr,
 399             "usage: %s [-bcdfHimnrSsu] [-k field1[,field2]] [-o output]"
 400             " [-R char] [-T dir]", getprogname());
 401         (void)fprintf(stderr,
 402             "             [-t char] [file ...]\n");
 403         exit(2);
 404 }