]> CyberLeo.Net >> Repos - FreeBSD/releng/9.2.git/blob - usr.bin/split/split.c
- Copy stable/9 to releng/9.2 as part of the 9.2-RELEASE cycle.
[FreeBSD/releng/9.2.git] / 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
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
32
33 #ifndef lint
34 static const char copyright[] =
35 "@(#) Copyright (c) 1987, 1993, 1994\n\
36         The Regents of the University of California.  All rights reserved.\n";
37 #endif
38
39 #ifndef lint
40 static const char sccsid[] = "@(#)split.c       8.2 (Berkeley) 4/16/94";
41 #endif
42
43 #include <sys/param.h>
44 #include <sys/types.h>
45 #include <sys/stat.h>
46
47 #include <ctype.h>
48 #include <err.h>
49 #include <errno.h>
50 #include <fcntl.h>
51 #include <inttypes.h>
52 #include <limits.h>
53 #include <locale.h>
54 #include <stdbool.h>
55 #include <stdint.h>
56 #include <stdio.h>
57 #include <stdlib.h>
58 #include <string.h>
59 #include <unistd.h>
60 #include <regex.h>
61 #include <sysexits.h>
62
63 #define DEFLINE 1000                    /* Default num lines per file. */
64
65 static off_t     bytecnt;               /* Byte count to split on. */
66 static off_t     chunks = 0;            /* Chunks count to split into. */
67 static long      numlines;              /* Line count to split on. */
68 static int       file_open;             /* If a file open. */
69 static int       ifd = -1, ofd = -1;    /* Input/output file descriptors. */
70 static char      bfr[MAXBSIZE];         /* I/O buffer. */
71 static char      fname[MAXPATHLEN];     /* File name prefix. */
72 static regex_t   rgx;
73 static int       pflag;
74 static bool      dflag;
75 static long      sufflen = 2;           /* File name suffix length. */
76
77 static void newfile(void);
78 static void split1(void);
79 static void split2(void);
80 static void split3(void);
81 static void usage(void);
82
83 int
84 main(int argc, char **argv)
85 {
86         intmax_t bytecnti;
87         long scale;
88         int ch;
89         char *ep, *p;
90
91         setlocale(LC_ALL, "");
92
93         dflag = false;
94         while ((ch = getopt(argc, argv, "0123456789a:b:dl:n:p:")) != -1)
95                 switch (ch) {
96                 case '0': case '1': case '2': case '3': case '4':
97                 case '5': case '6': case '7': case '8': case '9':
98                         /*
99                          * Undocumented kludge: split was originally designed
100                          * to take a number after a dash.
101                          */
102                         if (numlines == 0) {
103                                 p = argv[optind - 1];
104                                 if (p[0] == '-' && p[1] == ch && !p[2])
105                                         numlines = strtol(++p, &ep, 10);
106                                 else
107                                         numlines =
108                                             strtol(argv[optind] + 1, &ep, 10);
109                                 if (numlines <= 0 || *ep)
110                                         errx(EX_USAGE,
111                                             "%s: illegal line count", optarg);
112                         }
113                         break;
114                 case 'a':               /* Suffix length */
115                         if ((sufflen = strtol(optarg, &ep, 10)) <= 0 || *ep)
116                                 errx(EX_USAGE,
117                                     "%s: illegal suffix length", optarg);
118                         break;
119                 case 'b':               /* Byte count. */
120                         errno = 0;
121                         if ((bytecnti = strtoimax(optarg, &ep, 10)) <= 0 ||
122                             strchr("kKmMgG", *ep) == NULL || errno != 0)
123                                 errx(EX_USAGE,
124                                     "%s: illegal byte count", optarg);
125                         if (*ep == 'k' || *ep == 'K')
126                                 scale = 1024;
127                         else if (*ep == 'm' || *ep == 'M')
128                                 scale = 1024 * 1024;
129                         else if (*ep == 'g' || *ep == 'G')
130                                 scale = 1024 * 1024 * 1024;
131                         else
132                                 scale = 1;
133                         if (bytecnti > OFF_MAX / scale)
134                                 errx(EX_USAGE, "%s: offset too large", optarg);
135                         bytecnt = (off_t)(bytecnti * scale);
136                         break;
137                 case 'd':               /* Decimal suffix */
138                         dflag = true;
139                         break;
140                 case 'l':               /* Line count. */
141                         if (numlines != 0)
142                                 usage();
143                         if ((numlines = strtol(optarg, &ep, 10)) <= 0 || *ep)
144                                 errx(EX_USAGE,
145                                     "%s: illegal line count", optarg);
146                         break;
147                 case 'n':               /* Chunks. */
148                         if (!isdigit((unsigned char)optarg[0]) ||
149                             (chunks = (size_t)strtoul(optarg, &ep, 10)) == 0 ||
150                             *ep != '\0') {
151                                 errx(EX_USAGE, "%s: illegal number of chunks",
152                                      optarg);
153                         }
154                         break;
155
156                 case 'p':               /* pattern matching. */
157                         if (regcomp(&rgx, optarg, REG_EXTENDED|REG_NOSUB) != 0)
158                                 errx(EX_USAGE, "%s: illegal regexp", optarg);
159                         pflag = 1;
160                         break;
161                 default:
162                         usage();
163                 }
164         argv += optind;
165         argc -= optind;
166
167         if (*argv != NULL) {                    /* Input file. */
168                 if (strcmp(*argv, "-") == 0)
169                         ifd = STDIN_FILENO;
170                 else if ((ifd = open(*argv, O_RDONLY, 0)) < 0)
171                         err(EX_NOINPUT, "%s", *argv);
172                 ++argv;
173         }
174         if (*argv != NULL)                      /* File name prefix. */
175                 if (strlcpy(fname, *argv++, sizeof(fname)) >= sizeof(fname))
176                         errx(EX_USAGE, "file name prefix is too long");
177         if (*argv != NULL)
178                 usage();
179
180         if (strlen(fname) + (unsigned long)sufflen >= sizeof(fname))
181                 errx(EX_USAGE, "suffix is too long");
182         if (pflag && (numlines != 0 || bytecnt != 0 || chunks != 0))
183                 usage();
184
185         if (numlines == 0)
186                 numlines = DEFLINE;
187         else if (bytecnt != 0 || chunks != 0)
188                 usage();
189
190         if (bytecnt && chunks)
191                 usage();
192
193         if (ifd == -1)                          /* Stdin by default. */
194                 ifd = 0;
195
196         if (bytecnt) {
197                 split1();
198                 exit (0);
199         } else if (chunks) {
200                 split3();
201                 exit (0);
202         }
203         split2();
204         if (pflag)
205                 regfree(&rgx);
206         exit(0);
207 }
208
209 /*
210  * split1 --
211  *      Split the input by bytes.
212  */
213 static void
214 split1(void)
215 {
216         off_t bcnt;
217         char *C;
218         ssize_t dist, len;
219         int nfiles;
220
221         nfiles = 0;
222
223         for (bcnt = 0;;)
224                 switch ((len = read(ifd, bfr, MAXBSIZE))) {
225                 case 0:
226                         exit(0);
227                 case -1:
228                         err(EX_IOERR, "read");
229                         /* NOTREACHED */
230                 default:
231                         if (!file_open) {
232                                 if (!chunks || (nfiles < chunks)) {
233                                         newfile();
234                                         nfiles++;
235                                 }
236                         }
237                         if (bcnt + len >= bytecnt) {
238                                 dist = bytecnt - bcnt;
239                                 if (write(ofd, bfr, dist) != dist)
240                                         err(EX_IOERR, "write");
241                                 len -= dist;
242                                 for (C = bfr + dist; len >= bytecnt;
243                                     len -= bytecnt, C += bytecnt) {
244                                         if (!chunks || (nfiles < chunks)) {
245                                         newfile();
246                                                 nfiles++;
247                                         }
248                                         if (write(ofd,
249                                             C, bytecnt) != bytecnt)
250                                                 err(EX_IOERR, "write");
251                                 }
252                                 if (len != 0) {
253                                         if (!chunks || (nfiles < chunks)) {
254                                         newfile();
255                                                 nfiles++;
256                                         }
257                                         if (write(ofd, C, len) != len)
258                                                 err(EX_IOERR, "write");
259                                 } else
260                                         file_open = 0;
261                                 bcnt = len;
262                         } else {
263                                 bcnt += len;
264                                 if (write(ofd, bfr, len) != len)
265                                         err(EX_IOERR, "write");
266                         }
267                 }
268 }
269
270 /*
271  * split2 --
272  *      Split the input by lines.
273  */
274 static void
275 split2(void)
276 {
277         long lcnt = 0;
278         FILE *infp;
279
280         /* Stick a stream on top of input file descriptor */
281         if ((infp = fdopen(ifd, "r")) == NULL)
282                 err(EX_NOINPUT, "fdopen");
283
284         /* Process input one line at a time */
285         while (fgets(bfr, sizeof(bfr), infp) != NULL) {
286                 const int len = strlen(bfr);
287
288                 /* If line is too long to deal with, just write it out */
289                 if (bfr[len - 1] != '\n')
290                         goto writeit;
291
292                 /* Check if we need to start a new file */
293                 if (pflag) {
294                         regmatch_t pmatch;
295
296                         pmatch.rm_so = 0;
297                         pmatch.rm_eo = len - 1;
298                         if (regexec(&rgx, bfr, 0, &pmatch, REG_STARTEND) == 0)
299                                 newfile();
300                 } else if (lcnt++ == numlines) {
301                         newfile();
302                         lcnt = 1;
303                 }
304
305 writeit:
306                 /* Open output file if needed */
307                 if (!file_open)
308                         newfile();
309
310                 /* Write out line */
311                 if (write(ofd, bfr, len) != len)
312                         err(EX_IOERR, "write");
313         }
314
315         /* EOF or error? */
316         if (ferror(infp))
317                 err(EX_IOERR, "read");
318         else
319                 exit(0);
320 }
321
322 /*
323  * split3 --
324  *      Split the input into specified number of chunks
325  */
326 static void
327 split3(void)
328 {
329         struct stat sb;
330
331         if (fstat(ifd, &sb) == -1) {
332                 err(1, "stat");
333                 /* NOTREACHED */
334         }
335
336         if (chunks > sb.st_size) {
337                 errx(1, "can't split into more than %d files",
338                     (int)sb.st_size);
339                 /* NOTREACHED */
340         }
341
342         bytecnt = sb.st_size / chunks;
343         split1();
344 }
345
346
347 /*
348  * newfile --
349  *      Open a new output file.
350  */
351 static void
352 newfile(void)
353 {
354         long i, maxfiles, tfnum;
355         static long fnum;
356         static char *fpnt;
357         char beg, end;
358         int pattlen;
359
360         if (ofd == -1) {
361                 if (fname[0] == '\0') {
362                         fname[0] = 'x';
363                         fpnt = fname + 1;
364                 } else {
365                         fpnt = fname + strlen(fname);
366                 }
367                 ofd = fileno(stdout);
368         }
369
370         if (dflag) {
371                 beg = '0';
372                 end = '9';
373         }
374         else {
375                 beg = 'a';
376                 end = 'z';
377         }
378         pattlen = end - beg + 1;
379
380         /* maxfiles = pattlen^sufflen, but don't use libm. */
381         for (maxfiles = 1, i = 0; i < sufflen; i++)
382                 if (LONG_MAX / pattlen < maxfiles)
383                         errx(EX_USAGE, "suffix is too long (max %ld)", i);
384                 else
385                         maxfiles *= pattlen;
386
387         if (fnum == maxfiles)
388                 errx(EX_DATAERR, "too many files");
389
390         /* Generate suffix of sufflen letters */
391         tfnum = fnum;
392         i = sufflen - 1;
393         do {
394                 fpnt[i] = tfnum % pattlen + beg;
395                 tfnum /= pattlen;
396         } while (i-- > 0);
397         fpnt[sufflen] = '\0';
398
399         ++fnum;
400         if (!freopen(fname, "w", stdout))
401                 err(EX_IOERR, "%s", fname);
402         file_open = 1;
403 }
404
405 static void
406 usage(void)
407 {
408         (void)fprintf(stderr,
409 "usage: split [-l line_count] [-a suffix_length] [file [prefix]]\n"
410 "       split -b byte_count[K|k|M|m|G|g] [-a suffix_length] [file [prefix]]\n"
411 "       split -n chunk_count [-a suffix_length] [file [prefix]]\n"
412 "       split -p pattern [-a suffix_length] [file [prefix]]\n");
413         exit(EX_USAGE);
414 }