usr.bin/split/split.c

   1 /*
   2  * Copyright (c) 1987, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1987, 1993, 1994 The Regents of the University of California.  All rights reserved.
  34  * @(#)split.c  8.2 (Berkeley) 4/16/94
  35  * $FreeBSD: src/usr.bin/split/split.c,v 1.6.2.2 2002/07/25 12:46:36 tjr Exp $
  36  * $DragonFly: src/usr.bin/split/split.c,v 1.6 2005/08/30 21:19:13 liamfoy Exp $
  37  */
  38
  39 #include <sys/param.h>
  40
  41 #include <ctype.h>
  42 #include <err.h>
  43 #include <errno.h>
  44 #include <fcntl.h>
  45 #include <limits.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49 #include <unistd.h>
  50 #include <regex.h>
  51 #include <sysexits.h>
  52
  53 #define DEFLINE 1000                    /* Default num lines per file. */
  54
  55 off_t    bytecnt;                       /* Byte count to split on. */
  56 long     numlines;                      /* Line count to split on. */
  57 int      file_open;                     /* If a file open. */
  58 int      ifd = -1, ofd = -1;            /* Input/output file descriptors. */
  59 char     *bfr;                          /* I/O buffer. */
  60 char     fname[MAXPATHLEN];             /* File name prefix. */
  61 regex_t  rgx;
  62 int      pflag;
  63 long     sufflen = 2;                   /* File name suffix length. */
  64
  65 void newfile(void);
  66 void split1(void);
  67 void split2(void);
  68 static void usage(void);
  69
  70 int
  71 main(int argc, char **argv)
  72 {
  73         long long bytecnti;
  74         long scale;
  75         int ch;
  76         char *ep, *p;
  77
  78         while ((ch = getopt(argc, argv, "0123456789a:b:l:p:")) != -1)
  79                 switch (ch) {
  80                 case '0': case '1': case '2': case '3': case '4':
  81                 case '5': case '6': case '7': case '8': case '9':
  82                         /*
  83                          * Undocumented kludge: split was originally designed
  84                          * to take a number after a dash.
  85                          */
  86                         if (numlines == 0) {
  87                                 p = argv[optind - 1];
  88                                 if (p[0] == '-' && p[1] == ch && !p[2])
  89                                         numlines = strtol(++p, &ep, 10);
  90                                 else
  91                                         numlines =
  92                                             strtol(argv[optind] + 1, &ep, 10);
  93                                 if (numlines <= 0 || *ep)
  94                                         errx(EX_USAGE,
  95                                             "%s: illegal line count", optarg);
  96                         }
  97                         break;
  98                 case 'a':               /* Suffix length */
  99                         if ((sufflen = strtol(optarg, &ep, 10)) <= 0 || *ep)
 100                                 errx(EX_USAGE,
 101                                     "%s: illegal suffix length", optarg);
 102                         break;
 103                 case 'b':               /* Byte count. */
 104                         errno = 0;
 105                         if ((bytecnti = strtoll(optarg, &ep, 10)) <= 0 ||
 106                             (*ep != '\0' && *ep != 'k' && *ep != 'm') ||
 107                             errno != 0)
 108                                 errx(EX_USAGE,
 109                                     "%s: illegal byte count", optarg);
 110                         if (*ep == 'k')
 111                                 scale = 1024;
 112                         else if (*ep == 'm')
 113                                 scale = 1024 * 1024;
 114                         else
 115                                 scale = 1;
 116                         bytecnt = (off_t)(bytecnti * scale);
 117                         break;
 118                 case 'p' :      /* pattern matching. */
 119                         if (regcomp(&rgx, optarg, REG_EXTENDED|REG_NOSUB) != 0)
 120                                 errx(EX_USAGE, "%s: illegal regexp", optarg);
 121                         pflag = 1;
 122                         break;
 123                 case 'l':               /* Line count. */
 124                         if (numlines != 0)
 125                                 usage();
 126                         if ((numlines = strtol(optarg, &ep, 10)) <= 0 || *ep)
 127                                 errx(EX_USAGE,
 128                                     "%s: illegal line count", optarg);
 129                         break;
 130                 default:
 131                         usage();
 132                 }
 133         argv += optind;
 134         argc -= optind;
 135
 136         if (*argv != NULL) {
 137                 if (strcmp(*argv, "-") == 0)
 138                         ifd = STDIN_FILENO;
 139                 else if ((ifd = open(*argv, O_RDONLY, 0)) < 0)
 140                         err(EX_NOINPUT, "%s", *argv);
 141                 ++argv;
 142         }
 143
 144         if (*argv != NULL)                      /* File name prefix. */
 145                 if (strlcpy(fname, *argv++, sizeof(fname)) >= sizeof(fname))
 146                         errx(EX_USAGE, "file name prefix is too long");
 147         if (*argv != NULL)
 148                 usage();
 149
 150         if (strlen(fname) + (unsigned long)sufflen >= sizeof(fname))
 151                 errx(EX_USAGE, "suffix is too long");
 152         if (pflag && (numlines != 0 || bytecnt != 0))
 153                 usage();
 154
 155         if (numlines == 0)
 156                 numlines = DEFLINE;
 157         else if (bytecnt != 0)
 158                 usage();
 159
 160         if (ifd == -1)                          /* Stdin by default. */
 161                 ifd = 0;
 162
 163         if (bytecnt) {
 164                 split1();
 165                 exit (0);
 166         }
 167         split2();
 168         if (pflag)
 169                 regfree(&rgx);
 170         exit(0);
 171 }
 172
 173 /*
 174  * split1 --
 175  *      Split the input by bytes.
 176  */
 177 void
 178 split1(void)
 179 {
 180         off_t bcnt;
 181         char *C;
 182         ssize_t dist, len;
 183
 184         if((bfr = (char *)malloc(bytecnt)) == NULL)
 185                 err(EX_OSERR, "malloc");
 186
 187         for (bcnt = 0;;)
 188                 switch ((len = read(ifd, bfr, bytecnt))) {
 189                 case 0:
 190                         free(bfr);
 191                         exit(0);
 192                 case -1:
 193                         free(bfr);
 194                         err(EX_IOERR, "read");
 195                         /* NOTREACHED */
 196                 default:
 197                         if (!file_open)
 198                                 newfile();
 199                         if (bcnt + len >= bytecnt) {
 200                                 dist = bytecnt - bcnt;
 201                                 if (write(ofd, bfr, dist) != dist)
 202                                         err(EX_IOERR, "write");
 203                                 len -= dist;
 204                                 for (C = bfr + dist; len >= bytecnt;
 205                                     len -= bytecnt, C += bytecnt) {
 206                                         newfile();
 207                                         if (write(ofd,
 208                                             C, (int)bytecnt) != bytecnt) {
 209                                                 free(bfr);
 210                                                 err(EX_IOERR, "write");
 211                                         }
 212                                 }
 213                                 if (len != 0) {
 214                                         newfile();
 215                                         if (write(ofd, C, len) != len) {
 216                                                 free(bfr);
 217                                                 err(EX_IOERR, "write");
 218                                         }
 219                                 } else
 220                                         file_open = 0;
 221                                 bcnt = len;
 222                         } else {
 223                                 bcnt += len;
 224                                 if (write(ofd, bfr, len) != len) {
 225                                         free(bfr);
 226                                         err(EX_IOERR, "write");
 227                                 }
 228                         }
 229                 }
 230         free(bfr);
 231 }
 232
 233 /*
 234  * split2 --
 235  *      Split the input by lines.
 236  */
 237 void
 238 split2(void)
 239 {
 240         int startofline = 1;
 241         long lcnt = 0;
 242         FILE *infp;
 243
 244         /* Stick a stream on top of input file descriptor */
 245         if ((infp = fdopen(ifd, "r")) == NULL)
 246                 err(EX_NOINPUT, "fdopen");
 247
 248         if((bfr = (char *)malloc(MAXBSIZE)) == NULL)
 249                 err(EX_OSERR, "malloc");
 250
 251         /* Process input one line at a time */
 252         while (fgets(bfr, MAXBSIZE, infp) != NULL) {
 253                 const int len = strlen(bfr);
 254
 255                 /* Consider starting a new file only when at beginning of a line */
 256                 if (startofline) {
 257                         /* Check if we need to start a new file */
 258                         if (pflag) {
 259                                 regmatch_t pmatch;
 260
 261                                 pmatch.rm_so = 0;
 262                                 pmatch.rm_eo = len - 1;
 263                                 if (regexec(&rgx, bfr, 0, &pmatch, REG_STARTEND) == 0)
 264                                         newfile();
 265                         } else if (lcnt++ == numlines) {
 266                                 newfile();
 267                                 lcnt = 1;
 268                         }
 269                 }
 270
 271                 if (bfr[len - 1] != '\n')
 272                         startofline = 0;
 273                 else
 274                         startofline = 1;
 275
 276                 /* Open output file if needed */
 277                 if (!file_open)
 278                         newfile();
 279
 280                 /* Write out line */
 281                 if (write(ofd, bfr, len) != len) {
 282                         free(bfr);
 283                         err(EX_IOERR, "write");
 284                 }
 285         }
 286
 287         free(bfr);
 288
 289         /* EOF or error? */
 290         if (ferror(infp))
 291                 err(EX_IOERR, "read");
 292         else
 293                 exit(0);
 294 }
 295
 296 /*
 297  * newfile --
 298  *      Open a new output file.
 299  */
 300 void
 301 newfile(void)
 302 {
 303         long i, maxfiles, tfnum;
 304         static long fnum;
 305         static int defname;
 306         static char *fpnt;
 307
 308         if (ofd == -1) {
 309                 if (fname[0] == '\0') {
 310                         fname[0] = 'x';
 311                         fpnt = fname + 1;
 312                         defname = 1;
 313                 } else {
 314                         fpnt = fname + strlen(fname);
 315                         defname = 0;
 316                 }
 317                 ofd = fileno(stdout);
 318         }
 319
 320         /* maxfiles = 26^sufflen, but don't use libm. */
 321         for (maxfiles = 1, i = 0; i < sufflen; i++)
 322                 if ((maxfiles *= 26) <= 0)
 323                         errx(EX_USAGE, "suffix is too long (max %ld)", i);
 324
 325         if (fnum == maxfiles)
 326                 errx(EX_DATAERR, "too many files");
 327
 328         /* Generate suffix of sufflen letters */
 329         tfnum = fnum;
 330         i = sufflen - 1;
 331         do {
 332                 fpnt[i] = tfnum % 26 + 'a';
 333                 tfnum /= 26;
 334         } while (i-- > 0);
 335         fpnt[sufflen] = '\0';
 336
 337         ++fnum;
 338         if (!freopen(fname, "w", stdout))
 339                 err(EX_IOERR, "%s", fname);
 340         file_open = 1;
 341 }
 342
 343 static void
 344 usage(void)
 345 {
 346         (void)fprintf(stderr,
 347 "usage: split [-a sufflen] [-b byte_count] [-l line_count] [-p pattern]\n");
 348         (void)fprintf(stderr,
 349 "             [file [prefix]]\n");
 350         exit(EX_USAGE);
 351 }