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