]> CyberLeo.Net >> Repos - FreeBSD/releng/9.0.git/blob - usr.bin/split/split.c
Copy stable/9 to releng/9.0 as part of the FreeBSD 9.0-RELEASE release
[FreeBSD/releng/9.0.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 <stdint.h>
55 #include <stdio.h>
56 #include <stdlib.h>
57 #include <string.h>
58 #include <unistd.h>
59 #include <regex.h>
60 #include <sysexits.h>
61
62 #define DEFLINE 1000                    /* Default num lines per file. */
63
64 off_t    bytecnt;                       /* Byte count to split on. */
65 off_t    chunks = 0;                    /* Chunks count to split into. */
66 long     numlines;                      /* Line count to split on. */
67 int      file_open;                     /* If a file open. */
68 int      ifd = -1, ofd = -1;            /* Input/output file descriptors. */
69 char     bfr[MAXBSIZE];                 /* I/O buffer. */
70 char     fname[MAXPATHLEN];             /* File name prefix. */
71 regex_t  rgx;
72 int      pflag;
73 long     sufflen = 2;                   /* File name suffix length. */
74
75 static void newfile(void);
76 static void split1(void);
77 static void split2(void);
78 static void split3(void);
79 static void usage(void);
80
81 int
82 main(int argc, char **argv)
83 {
84         intmax_t bytecnti;
85         long scale;
86         int ch;
87         char *ep, *p;
88
89         setlocale(LC_ALL, "");
90
91         while ((ch = getopt(argc, argv, "0123456789a:b:l:n:p:")) != -1)
92                 switch (ch) {
93                 case '0': case '1': case '2': case '3': case '4':
94                 case '5': case '6': case '7': case '8': case '9':
95                         /*
96                          * Undocumented kludge: split was originally designed
97                          * to take a number after a dash.
98                          */
99                         if (numlines == 0) {
100                                 p = argv[optind - 1];
101                                 if (p[0] == '-' && p[1] == ch && !p[2])
102                                         numlines = strtol(++p, &ep, 10);
103                                 else
104                                         numlines =
105                                             strtol(argv[optind] + 1, &ep, 10);
106                                 if (numlines <= 0 || *ep)
107                                         errx(EX_USAGE,
108                                             "%s: illegal line count", optarg);
109                         }
110                         break;
111                 case 'a':               /* Suffix length */
112                         if ((sufflen = strtol(optarg, &ep, 10)) <= 0 || *ep)
113                                 errx(EX_USAGE,
114                                     "%s: illegal suffix length", optarg);
115                         break;
116                 case 'b':               /* Byte count. */
117                         errno = 0;
118                         if ((bytecnti = strtoimax(optarg, &ep, 10)) <= 0 ||
119                             strchr("kKmMgG", *ep) == NULL || errno != 0)
120                                 errx(EX_USAGE,
121                                     "%s: illegal byte count", optarg);
122                         if (*ep == 'k' || *ep == 'K')
123                                 scale = 1024;
124                         else if (*ep == 'm' || *ep == 'M')
125                                 scale = 1024 * 1024;
126                         else if (*ep == 'g' || *ep == 'G')
127                                 scale = 1024 * 1024 * 1024;
128                         else
129                                 scale = 1;
130                         if (bytecnti > OFF_MAX / scale)
131                                 errx(EX_USAGE, "%s: offset too large", optarg);
132                         bytecnt = (off_t)(bytecnti * scale);
133                         break;
134                 case 'l':               /* Line count. */
135                         if (numlines != 0)
136                                 usage();
137                         if ((numlines = strtol(optarg, &ep, 10)) <= 0 || *ep)
138                                 errx(EX_USAGE,
139                                     "%s: illegal line count", optarg);
140                         break;
141                 case 'n':               /* Chunks. */
142                         if (!isdigit((unsigned char)optarg[0]) ||
143                             (chunks = (size_t)strtoul(optarg, &ep, 10)) == 0 ||
144                             *ep != '\0') {
145                                 errx(EX_USAGE, "%s: illegal number of chunks",
146                                      optarg);
147                         }
148                         break;
149
150                 case 'p':               /* pattern matching. */
151                         if (regcomp(&rgx, optarg, REG_EXTENDED|REG_NOSUB) != 0)
152                                 errx(EX_USAGE, "%s: illegal regexp", optarg);
153                         pflag = 1;
154                         break;
155                 default:
156                         usage();
157                 }
158         argv += optind;
159         argc -= optind;
160
161         if (*argv != NULL) {                    /* Input file. */
162                 if (strcmp(*argv, "-") == 0)
163                         ifd = STDIN_FILENO;
164                 else if ((ifd = open(*argv, O_RDONLY, 0)) < 0)
165                         err(EX_NOINPUT, "%s", *argv);
166                 ++argv;
167         }
168         if (*argv != NULL)                      /* File name prefix. */
169                 if (strlcpy(fname, *argv++, sizeof(fname)) >= sizeof(fname))
170                         errx(EX_USAGE, "file name prefix is too long");
171         if (*argv != NULL)
172                 usage();
173
174         if (strlen(fname) + (unsigned long)sufflen >= sizeof(fname))
175                 errx(EX_USAGE, "suffix is too long");
176         if (pflag && (numlines != 0 || bytecnt != 0 || chunks != 0))
177                 usage();
178
179         if (numlines == 0)
180                 numlines = DEFLINE;
181         else if (bytecnt != 0 || chunks != 0)
182                 usage();
183
184         if (bytecnt && chunks)
185                 usage();
186
187         if (ifd == -1)                          /* Stdin by default. */
188                 ifd = 0;
189
190         if (bytecnt) {
191                 split1();
192                 exit (0);
193         } else if (chunks) {
194                 split3();
195                 exit (0);
196         }
197         split2();
198         if (pflag)
199                 regfree(&rgx);
200         exit(0);
201 }
202
203 /*
204  * split1 --
205  *      Split the input by bytes.
206  */
207 static void
208 split1(void)
209 {
210         off_t bcnt;
211         char *C;
212         ssize_t dist, len;
213         int nfiles;
214
215         nfiles = 0;
216
217         for (bcnt = 0;;)
218                 switch ((len = read(ifd, bfr, MAXBSIZE))) {
219                 case 0:
220                         exit(0);
221                 case -1:
222                         err(EX_IOERR, "read");
223                         /* NOTREACHED */
224                 default:
225                         if (!file_open) {
226                                 if (!chunks || (nfiles < chunks)) {
227                                         newfile();
228                                         nfiles++;
229                                 }
230                         }
231                         if (bcnt + len >= bytecnt) {
232                                 dist = bytecnt - bcnt;
233                                 if (write(ofd, bfr, dist) != dist)
234                                         err(EX_IOERR, "write");
235                                 len -= dist;
236                                 for (C = bfr + dist; len >= bytecnt;
237                                     len -= bytecnt, C += bytecnt) {
238                                         if (!chunks || (nfiles < chunks)) {
239                                         newfile();
240                                                 nfiles++;
241                                         }
242                                         if (write(ofd,
243                                             C, bytecnt) != bytecnt)
244                                                 err(EX_IOERR, "write");
245                                 }
246                                 if (len != 0) {
247                                         if (!chunks || (nfiles < chunks)) {
248                                         newfile();
249                                                 nfiles++;
250                                         }
251                                         if (write(ofd, C, len) != len)
252                                                 err(EX_IOERR, "write");
253                                 } else
254                                         file_open = 0;
255                                 bcnt = len;
256                         } else {
257                                 bcnt += len;
258                                 if (write(ofd, bfr, len) != len)
259                                         err(EX_IOERR, "write");
260                         }
261                 }
262 }
263
264 /*
265  * split2 --
266  *      Split the input by lines.
267  */
268 static void
269 split2(void)
270 {
271         long lcnt = 0;
272         FILE *infp;
273
274         /* Stick a stream on top of input file descriptor */
275         if ((infp = fdopen(ifd, "r")) == NULL)
276                 err(EX_NOINPUT, "fdopen");
277
278         /* Process input one line at a time */
279         while (fgets(bfr, sizeof(bfr), infp) != NULL) {
280                 const int len = strlen(bfr);
281
282                 /* If line is too long to deal with, just write it out */
283                 if (bfr[len - 1] != '\n')
284                         goto writeit;
285
286                 /* Check if we need to start a new file */
287                 if (pflag) {
288                         regmatch_t pmatch;
289
290                         pmatch.rm_so = 0;
291                         pmatch.rm_eo = len - 1;
292                         if (regexec(&rgx, bfr, 0, &pmatch, REG_STARTEND) == 0)
293                                 newfile();
294                 } else if (lcnt++ == numlines) {
295                         newfile();
296                         lcnt = 1;
297                 }
298
299 writeit:
300                 /* Open output file if needed */
301                 if (!file_open)
302                         newfile();
303
304                 /* Write out line */
305                 if (write(ofd, bfr, len) != len)
306                         err(EX_IOERR, "write");
307         }
308
309         /* EOF or error? */
310         if (ferror(infp))
311                 err(EX_IOERR, "read");
312         else
313                 exit(0);
314 }
315
316 /*
317  * split3 --
318  *      Split the input into specified number of chunks
319  */
320 static void
321 split3(void)
322 {
323         struct stat sb;
324
325         if (fstat(ifd, &sb) == -1) {
326                 err(1, "stat");
327                 /* NOTREACHED */
328         }
329
330         if (chunks > sb.st_size) {
331                 errx(1, "can't split into more than %d files",
332                     (int)sb.st_size);
333                 /* NOTREACHED */
334         }
335
336         bytecnt = sb.st_size / chunks;
337         split1();
338 }
339
340
341 /*
342  * newfile --
343  *      Open a new output file.
344  */
345 static void
346 newfile(void)
347 {
348         long i, maxfiles, tfnum;
349         static long fnum;
350         static int defname;
351         static char *fpnt;
352
353         if (ofd == -1) {
354                 if (fname[0] == '\0') {
355                         fname[0] = 'x';
356                         fpnt = fname + 1;
357                         defname = 1;
358                 } else {
359                         fpnt = fname + strlen(fname);
360                         defname = 0;
361                 }
362                 ofd = fileno(stdout);
363         }
364
365         /* maxfiles = 26^sufflen, but don't use libm. */
366         for (maxfiles = 1, i = 0; i < sufflen; i++)
367                 if ((maxfiles *= 26) <= 0)
368                         errx(EX_USAGE, "suffix is too long (max %ld)", i);
369
370         if (fnum == maxfiles)
371                 errx(EX_DATAERR, "too many files");
372
373         /* Generate suffix of sufflen letters */
374         tfnum = fnum;
375         i = sufflen - 1;
376         do {
377                 fpnt[i] = tfnum % 26 + 'a';
378                 tfnum /= 26;
379         } while (i-- > 0);
380         fpnt[sufflen] = '\0';
381
382         ++fnum;
383         if (!freopen(fname, "w", stdout))
384                 err(EX_IOERR, "%s", fname);
385         file_open = 1;
386 }
387
388 static void
389 usage(void)
390 {
391         (void)fprintf(stderr,
392 "usage: split [-l line_count] [-a suffix_length] [file [prefix]]\n"
393 "       split -b byte_count[K|k|M|m|G|g] [-a suffix_length] [file [prefix]]\n"
394 "       split -n chunk_count [-a suffix_length] [file [prefix]]\n"
395 "       split -p pattern [-a suffix_length] [file [prefix]]\n");
396         exit(EX_USAGE);
397 }