1 /* $NetBSD: split.c,v 1.27 2017/01/10 21:14:13 christos Exp $ */ 2 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 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1987, 1993, 1994\ 35 The Regents of the University of California. All rights reserved."); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)split.c 8.3 (Berkeley) 4/25/94"; 41 #endif 42 __RCSID("$NetBSD: split.c,v 1.27 2017/01/10 21:14:13 christos Exp $"); 43 #endif /* not lint */ 44 45 #include <sys/param.h> 46 #include <sys/stat.h> 47 48 #include <ctype.h> 49 #include <err.h> 50 #include <errno.h> 51 #include <fcntl.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <unistd.h> 56 57 #define DEFLINE 1000 /* Default num lines per file. */ 58 59 static int file_open; /* If a file open. */ 60 static int ifd = STDIN_FILENO, ofd = -1; /* Input/output file descriptors. */ 61 static char *fname; /* File name prefix. */ 62 static size_t sfxlen = 2; /* suffix length. */ 63 64 static void newfile(void); 65 static void split1(off_t, int) __dead; 66 static void split2(off_t) __dead; 67 static void split3(off_t) __dead; 68 static void usage(void) __dead; 69 static size_t bigwrite(int, void const *, size_t); 70 71 int 72 main(int argc, char *argv[]) 73 { 74 int ch; 75 char *ep, *p; 76 char const *base; 77 off_t bytecnt = 0; /* Byte count to split on. */ 78 off_t numlines = 0; /* Line count to split on. */ 79 off_t chunks = 0; /* Number of chunks to split into. */ 80 81 while ((ch = getopt(argc, argv, "0123456789b:l:a:n:")) != -1) 82 switch (ch) { 83 case '0': case '1': case '2': case '3': case '4': 84 case '5': case '6': case '7': case '8': case '9': 85 /* 86 * Undocumented kludge: split was originally designed 87 * to take a number after a dash. 88 */ 89 if (numlines == 0) { 90 p = argv[optind - 1]; 91 if (p[0] == '-' && p[1] == ch && !p[2]) 92 p++; 93 else 94 p = argv[optind] + 1; 95 numlines = strtoull(p, &ep, 10); 96 if (numlines == 0 || *ep != '\0') 97 errx(1, "%s: illegal line count.", p); 98 } 99 break; 100 case 'b': /* Byte count. */ 101 if (!isdigit((unsigned char)optarg[0]) || 102 (bytecnt = strtoull(optarg, &ep, 10)) == 0 || 103 (*ep != '\0' && *ep != 'k' && *ep != 'm')) 104 errx(1, "%s: illegal byte count.", optarg); 105 if (*ep == 'k') 106 bytecnt *= 1024; 107 else if (*ep == 'm') 108 bytecnt *= 1024 * 1024; 109 break; 110 case 'l': /* Line count. */ 111 if (numlines != 0) 112 usage(); 113 if (!isdigit((unsigned char)optarg[0]) || 114 (numlines = strtoull(optarg, &ep, 10)) == 0 || 115 *ep != '\0') 116 errx(1, "%s: illegal line count.", optarg); 117 break; 118 case 'a': /* Suffix length. */ 119 if (!isdigit((unsigned char)optarg[0]) || 120 (sfxlen = (size_t)strtoul(optarg, &ep, 10)) == 0 || 121 *ep != '\0') 122 errx(1, "%s: illegal suffix length.", optarg); 123 break; 124 case 'n': /* Chunks. */ 125 if (!isdigit((unsigned char)optarg[0]) || 126 (chunks = (size_t)strtoul(optarg, &ep, 10)) == 0 || 127 *ep != '\0') 128 errx(1, "%s: illegal number of chunks.", 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 = open(*argv, O_RDONLY, 0)) < 0) 139 err(1, "%s", *argv); 140 ++argv; 141 } 142 143 144 base = (*argv != NULL) ? *argv++ : "x"; 145 if ((fname = malloc(strlen(base) + sfxlen + 1)) == NULL) 146 err(EXIT_FAILURE, NULL); 147 (void)strcpy(fname, base); /* File name prefix. */ 148 149 if (*argv != NULL) 150 usage(); 151 152 if (numlines == 0) 153 numlines = DEFLINE; 154 else if (bytecnt || chunks) 155 usage(); 156 157 if (bytecnt && chunks) 158 usage(); 159 160 if (bytecnt) 161 split1(bytecnt, 0); 162 else if (chunks) 163 split3(chunks); 164 else 165 split2(numlines); 166 167 return 0; 168 } 169 170 /* 171 * split1 -- 172 * Split the input by bytes. 173 */ 174 static void 175 split1(off_t bytecnt, int maxcnt) 176 { 177 off_t bcnt; 178 ssize_t dist, len; 179 char *C; 180 char bfr[MAXBSIZE]; 181 int nfiles; 182 183 nfiles = 0; 184 185 for (bcnt = 0;;) 186 switch (len = read(ifd, bfr, MAXBSIZE)) { 187 case 0: 188 exit(0); 189 /* NOTREACHED */ 190 case -1: 191 err(1, "read"); 192 /* NOTREACHED */ 193 default: 194 if (!file_open) { 195 if (!maxcnt || (nfiles < maxcnt)) { 196 newfile(); 197 nfiles++; 198 file_open = 1; 199 } 200 } 201 if (bcnt + len >= bytecnt) { 202 /* LINTED: bytecnt - bcnt <= len */ 203 dist = bytecnt - bcnt; 204 if (bigwrite(ofd, bfr, dist) != (size_t)dist) 205 err(1, "write"); 206 len -= dist; 207 for (C = bfr + dist; len >= bytecnt; 208 /* LINTED: bytecnt <= len */ 209 len -= bytecnt, C += bytecnt) { 210 if (!maxcnt || (nfiles < maxcnt)) { 211 newfile(); 212 nfiles++; 213 } 214 /* LINTED: as above */ 215 if (bigwrite(ofd, 216 C, bytecnt) != (size_t)bytecnt) 217 err(1, "write"); 218 } 219 if (len) { 220 if (!maxcnt || (nfiles < maxcnt)) { 221 newfile(); 222 nfiles++; 223 } 224 /* LINTED: len >= 0 */ 225 if (bigwrite(ofd, C, len) != (size_t)len) 226 err(1, "write"); 227 } else 228 file_open = 0; 229 bcnt = len; 230 } else { 231 bcnt += len; 232 /* LINTED: len >= 0 */ 233 if (bigwrite(ofd, bfr, len) != (size_t)len) 234 err(1, "write"); 235 } 236 } 237 } 238 239 /* 240 * split2 -- 241 * Split the input by lines. 242 */ 243 static void 244 split2(off_t numlines) 245 { 246 off_t lcnt; 247 size_t bcnt; 248 ssize_t len; 249 char *Ce, *Cs; 250 char bfr[MAXBSIZE]; 251 252 for (lcnt = 0;;) 253 switch (len = read(ifd, bfr, MAXBSIZE)) { 254 case 0: 255 exit(0); 256 /* NOTREACHED */ 257 case -1: 258 err(1, "read"); 259 /* NOTREACHED */ 260 default: 261 if (!file_open) { 262 newfile(); 263 file_open = 1; 264 } 265 for (Cs = Ce = bfr; len--; Ce++) 266 if (*Ce == '\n' && ++lcnt == numlines) { 267 bcnt = Ce - Cs + 1; 268 if (bigwrite(ofd, Cs, bcnt) != (size_t)bcnt) 269 err(1, "write"); 270 lcnt = 0; 271 Cs = Ce + 1; 272 if (len) 273 newfile(); 274 else 275 file_open = 0; 276 } 277 if (Cs < Ce) { 278 bcnt = Ce - Cs; 279 if (bigwrite(ofd, Cs, bcnt) != (size_t)bcnt) 280 err(1, "write"); 281 } 282 } 283 } 284 285 /* 286 * split3 -- 287 * Split the input into specified number of chunks 288 */ 289 static void 290 split3(off_t chunks) 291 { 292 struct stat sb; 293 294 if (fstat(ifd, &sb) == -1) { 295 err(1, "stat"); 296 /* NOTREACHED */ 297 } 298 299 if (chunks > sb.st_size) { 300 errx(1, "can't split into more than %d files", 301 (int)sb.st_size); 302 /* NOTREACHED */ 303 } 304 305 split1(sb.st_size/chunks, chunks); 306 } 307 308 /* 309 * newfile -- 310 * Open a new output file. 311 */ 312 static void 313 newfile(void) 314 { 315 static int fnum; 316 static char *fpnt; 317 int quot, i; 318 319 if (ofd == -1) { 320 fpnt = fname + strlen(fname); 321 fpnt[sfxlen] = '\0'; 322 } else if (close(ofd) != 0) 323 err(1, "%s", fname); 324 325 quot = fnum; 326 for (i = sfxlen - 1; i >= 0; i--) { 327 fpnt[i] = quot % 26 + 'a'; 328 quot = quot / 26; 329 } 330 if (quot > 0) 331 errx(1, "too many files."); 332 ++fnum; 333 if ((ofd = open(fname, O_WRONLY | O_CREAT | O_TRUNC, DEFFILEMODE)) < 0) 334 err(1, "%s", fname); 335 } 336 337 static size_t 338 bigwrite(int fd, const void *buf, size_t len) 339 { 340 const char *ptr = buf; 341 size_t sofar = 0; 342 ssize_t w; 343 344 while (len != 0) { 345 if ((w = write(fd, ptr, len)) == -1) 346 return sofar; 347 len -= w; 348 ptr += w; 349 sofar += w; 350 } 351 return sofar; 352 } 353 354 355 static void 356 usage(void) 357 { 358 (void)fprintf(stderr, 359 "usage: %s [-b byte_count] [-l line_count] [-n chunk_count] [-a suffix_length] " 360 "[file [prefix]]\n", getprogname()); 361 exit(1); 362 } 363