1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1987, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #ifndef lint 36 static const char copyright[] = 37 "@(#) Copyright (c) 1987, 1993, 1994\n\ 38 The Regents of the University of California. All rights reserved.\n"; 39 #endif 40 41 #ifndef lint 42 static const char sccsid[] = "@(#)split.c 8.2 (Berkeley) 4/16/94"; 43 #endif 44 45 #include <sys/param.h> 46 #include <sys/types.h> 47 #include <sys/stat.h> 48 49 #include <ctype.h> 50 #include <err.h> 51 #include <errno.h> 52 #include <fcntl.h> 53 #include <inttypes.h> 54 #include <libutil.h> 55 #include <limits.h> 56 #include <locale.h> 57 #include <stdbool.h> 58 #include <stdint.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include <unistd.h> 63 #include <regex.h> 64 #include <sysexits.h> 65 66 #define DEFLINE 1000 /* Default num lines per file. */ 67 68 static off_t bytecnt; /* Byte count to split on. */ 69 static off_t chunks = 0; /* Chunks count to split into. */ 70 static long numlines; /* Line count to split on. */ 71 static int file_open; /* If a file open. */ 72 static int ifd = -1, ofd = -1; /* Input/output file descriptors. */ 73 static char bfr[MAXBSIZE]; /* I/O buffer. */ 74 static char fname[MAXPATHLEN]; /* File name prefix. */ 75 static regex_t rgx; 76 static int pflag; 77 static bool dflag; 78 static long sufflen = 2; /* File name suffix length. */ 79 80 static void newfile(void); 81 static void split1(void); 82 static void split2(void); 83 static void split3(void); 84 static void usage(void); 85 86 int 87 main(int argc, char **argv) 88 { 89 int ch; 90 int error; 91 char *ep, *p; 92 93 setlocale(LC_ALL, ""); 94 95 dflag = false; 96 while ((ch = getopt(argc, argv, "0123456789a:b:dl:n:p:")) != -1) 97 switch (ch) { 98 case '0': case '1': case '2': case '3': case '4': 99 case '5': case '6': case '7': case '8': case '9': 100 /* 101 * Undocumented kludge: split was originally designed 102 * to take a number after a dash. 103 */ 104 if (numlines == 0) { 105 p = argv[optind - 1]; 106 if (p[0] == '-' && p[1] == ch && !p[2]) 107 numlines = strtol(++p, &ep, 10); 108 else 109 numlines = 110 strtol(argv[optind] + 1, &ep, 10); 111 if (numlines <= 0 || *ep) 112 errx(EX_USAGE, 113 "%s: illegal line count", optarg); 114 } 115 break; 116 case 'a': /* Suffix length */ 117 if ((sufflen = strtol(optarg, &ep, 10)) <= 0 || *ep) 118 errx(EX_USAGE, 119 "%s: illegal suffix length", optarg); 120 break; 121 case 'b': /* Byte count. */ 122 errno = 0; 123 error = expand_number(optarg, &bytecnt); 124 if (error == -1) 125 errx(EX_USAGE, "%s: offset too large", optarg); 126 break; 127 case 'd': /* Decimal suffix */ 128 dflag = true; 129 break; 130 case 'l': /* Line count. */ 131 if (numlines != 0) 132 usage(); 133 if ((numlines = strtol(optarg, &ep, 10)) <= 0 || *ep) 134 errx(EX_USAGE, 135 "%s: illegal line count", optarg); 136 break; 137 case 'n': /* Chunks. */ 138 if (!isdigit((unsigned char)optarg[0]) || 139 (chunks = (size_t)strtoul(optarg, &ep, 10)) == 0 || 140 *ep != '\0') { 141 errx(EX_USAGE, "%s: illegal number of chunks", 142 optarg); 143 } 144 break; 145 146 case 'p': /* pattern matching. */ 147 if (regcomp(&rgx, optarg, REG_EXTENDED|REG_NOSUB) != 0) 148 errx(EX_USAGE, "%s: illegal regexp", optarg); 149 pflag = 1; 150 break; 151 default: 152 usage(); 153 } 154 argv += optind; 155 argc -= optind; 156 157 if (*argv != NULL) { /* Input file. */ 158 if (strcmp(*argv, "-") == 0) 159 ifd = STDIN_FILENO; 160 else if ((ifd = open(*argv, O_RDONLY, 0)) < 0) 161 err(EX_NOINPUT, "%s", *argv); 162 ++argv; 163 } 164 if (*argv != NULL) /* File name prefix. */ 165 if (strlcpy(fname, *argv++, sizeof(fname)) >= sizeof(fname)) 166 errx(EX_USAGE, "file name prefix is too long"); 167 if (*argv != NULL) 168 usage(); 169 170 if (strlen(fname) + (unsigned long)sufflen >= sizeof(fname)) 171 errx(EX_USAGE, "suffix is too long"); 172 if (pflag && (numlines != 0 || bytecnt != 0 || chunks != 0)) 173 usage(); 174 175 if (numlines == 0) 176 numlines = DEFLINE; 177 else if (bytecnt != 0 || chunks != 0) 178 usage(); 179 180 if (bytecnt && chunks) 181 usage(); 182 183 if (ifd == -1) /* Stdin by default. */ 184 ifd = 0; 185 186 if (bytecnt) { 187 split1(); 188 exit (0); 189 } else if (chunks) { 190 split3(); 191 exit (0); 192 } 193 split2(); 194 if (pflag) 195 regfree(&rgx); 196 exit(0); 197 } 198 199 /* 200 * split1 -- 201 * Split the input by bytes. 202 */ 203 static void 204 split1(void) 205 { 206 off_t bcnt; 207 char *C; 208 ssize_t dist, len; 209 int nfiles; 210 211 nfiles = 0; 212 213 for (bcnt = 0;;) 214 switch ((len = read(ifd, bfr, MAXBSIZE))) { 215 case 0: 216 exit(0); 217 case -1: 218 err(EX_IOERR, "read"); 219 /* NOTREACHED */ 220 default: 221 if (!file_open) { 222 if (!chunks || (nfiles < chunks)) { 223 newfile(); 224 nfiles++; 225 } 226 } 227 if (bcnt + len >= bytecnt) { 228 dist = bytecnt - bcnt; 229 if (write(ofd, bfr, dist) != dist) 230 err(EX_IOERR, "write"); 231 len -= dist; 232 for (C = bfr + dist; len >= bytecnt; 233 len -= bytecnt, C += bytecnt) { 234 if (!chunks || (nfiles < chunks)) { 235 newfile(); 236 nfiles++; 237 } 238 if (write(ofd, 239 C, bytecnt) != bytecnt) 240 err(EX_IOERR, "write"); 241 } 242 if (len != 0) { 243 if (!chunks || (nfiles < chunks)) { 244 newfile(); 245 nfiles++; 246 } 247 if (write(ofd, C, len) != len) 248 err(EX_IOERR, "write"); 249 } else 250 file_open = 0; 251 bcnt = len; 252 } else { 253 bcnt += len; 254 if (write(ofd, bfr, len) != len) 255 err(EX_IOERR, "write"); 256 } 257 } 258 } 259 260 /* 261 * split2 -- 262 * Split the input by lines. 263 */ 264 static void 265 split2(void) 266 { 267 long lcnt = 0; 268 FILE *infp; 269 270 /* Stick a stream on top of input file descriptor */ 271 if ((infp = fdopen(ifd, "r")) == NULL) 272 err(EX_NOINPUT, "fdopen"); 273 274 /* Process input one line at a time */ 275 while (fgets(bfr, sizeof(bfr), infp) != NULL) { 276 const int len = strlen(bfr); 277 278 /* If line is too long to deal with, just write it out */ 279 if (bfr[len - 1] != '\n') 280 goto writeit; 281 282 /* Check if we need to start a new file */ 283 if (pflag) { 284 regmatch_t pmatch; 285 286 pmatch.rm_so = 0; 287 pmatch.rm_eo = len - 1; 288 if (regexec(&rgx, bfr, 0, &pmatch, REG_STARTEND) == 0) 289 newfile(); 290 } else if (lcnt++ == numlines) { 291 newfile(); 292 lcnt = 1; 293 } 294 295 writeit: 296 /* Open output file if needed */ 297 if (!file_open) 298 newfile(); 299 300 /* Write out line */ 301 if (write(ofd, bfr, len) != len) 302 err(EX_IOERR, "write"); 303 } 304 305 /* EOF or error? */ 306 if (ferror(infp)) 307 err(EX_IOERR, "read"); 308 else 309 exit(0); 310 } 311 312 /* 313 * split3 -- 314 * Split the input into specified number of chunks 315 */ 316 static void 317 split3(void) 318 { 319 struct stat sb; 320 321 if (fstat(ifd, &sb) == -1) { 322 err(1, "stat"); 323 /* NOTREACHED */ 324 } 325 326 if (chunks > sb.st_size) { 327 errx(1, "can't split into more than %d files", 328 (int)sb.st_size); 329 /* NOTREACHED */ 330 } 331 332 bytecnt = sb.st_size / chunks; 333 split1(); 334 } 335 336 337 /* 338 * newfile -- 339 * Open a new output file. 340 */ 341 static void 342 newfile(void) 343 { 344 long i, maxfiles, tfnum; 345 static long fnum; 346 static char *fpnt; 347 char beg, end; 348 int pattlen; 349 350 if (ofd == -1) { 351 if (fname[0] == '\0') { 352 fname[0] = 'x'; 353 fpnt = fname + 1; 354 } else { 355 fpnt = fname + strlen(fname); 356 } 357 ofd = fileno(stdout); 358 } 359 360 if (dflag) { 361 beg = '0'; 362 end = '9'; 363 } 364 else { 365 beg = 'a'; 366 end = 'z'; 367 } 368 pattlen = end - beg + 1; 369 370 /* maxfiles = pattlen^sufflen, but don't use libm. */ 371 for (maxfiles = 1, i = 0; i < sufflen; i++) 372 if (LONG_MAX / pattlen < maxfiles) 373 errx(EX_USAGE, "suffix is too long (max %ld)", i); 374 else 375 maxfiles *= pattlen; 376 377 if (fnum == maxfiles) 378 errx(EX_DATAERR, "too many files"); 379 380 /* Generate suffix of sufflen letters */ 381 tfnum = fnum; 382 i = sufflen - 1; 383 do { 384 fpnt[i] = tfnum % pattlen + beg; 385 tfnum /= pattlen; 386 } while (i-- > 0); 387 fpnt[sufflen] = '\0'; 388 389 ++fnum; 390 if (!freopen(fname, "w", stdout)) 391 err(EX_IOERR, "%s", fname); 392 file_open = 1; 393 } 394 395 static void 396 usage(void) 397 { 398 (void)fprintf(stderr, 399 "usage: split [-l line_count] [-a suffix_length] [file [prefix]]\n" 400 " split -b byte_count[K|k|M|m|G|g] [-a suffix_length] [file [prefix]]\n" 401 " split -n chunk_count [-a suffix_length] [file [prefix]]\n" 402 " split -p pattern [-a suffix_length] [file [prefix]]\n"); 403 exit(EX_USAGE); 404 } 405