split.c revision 87765 
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 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <sys/cdefs.h>
35__FBSDID("$FreeBSD: head/usr.bin/split/split.c 87765 2001-12-12 23:09:07Z markm $");
36
37#ifndef lint
38static const char copyright[] =
39"@(#) Copyright (c) 1987, 1993, 1994\n\
40	The Regents of the University of California.  All rights reserved.\n";
41#endif
42
43#ifndef lint
44static const char sccsid[] = "@(#)split.c	8.2 (Berkeley) 4/16/94";
45#endif
46
47#include <sys/param.h>
48#include <sys/types.h>
49
50#include <ctype.h>
51#include <err.h>
52#include <fcntl.h>
53#include <stdio.h>
54#include <stdlib.h>
55#include <string.h>
56#include <unistd.h>
57#include <regex.h>
58#include <sysexits.h>
59
60#define DEFLINE	1000			/* Default num lines per file. */
61
62int	 bytecnt;			/* Byte count to split on. */
63long	 numlines;			/* Line count to split on. */
64int	 file_open;			/* If a file open. */
65int	 ifd = -1, ofd = -1;		/* Input/output file descriptors. */
66char	 bfr[MAXBSIZE];			/* I/O buffer. */
67char	 fname[MAXPATHLEN];		/* File name prefix. */
68regex_t	 rgx;
69int	 pflag;
70
71void newfile __P((void));
72void split1 __P((void));
73void split2 __P((void));
74static void usage __P((void));
75
76int
77main(argc, argv)
78	int argc;
79	char *argv[];
80{
81	int ch;
82	char *ep, *p;
83
84	while ((ch = getopt(argc, argv, "-0123456789b:l:p:")) != -1)
85		switch (ch) {
86		case '0': case '1': case '2': case '3': case '4':
87		case '5': case '6': case '7': case '8': case '9':
88			/*
89			 * Undocumented kludge: split was originally designed
90			 * to take a number after a dash.
91			 */
92			if (numlines == 0) {
93				p = argv[optind - 1];
94				if (p[0] == '-' && p[1] == ch && !p[2])
95					numlines = strtol(++p, &ep, 10);
96				else
97					numlines =
98					    strtol(argv[optind] + 1, &ep, 10);
99				if (numlines <= 0 || *ep)
100					errx(EX_USAGE,
101					    "%s: illegal line count", optarg);
102			}
103			break;
104		case '-':		/* Undocumented: historic stdin flag. */
105			if (ifd != -1)
106				usage();
107			ifd = 0;
108			break;
109		case 'b':		/* Byte count. */
110			if ((bytecnt = strtoq(optarg, &ep, 10)) <= 0 ||
111			    (*ep != '\0' && *ep != 'k' && *ep != 'm'))
112				errx(EX_USAGE,
113				    "%s: illegal byte count", optarg);
114			if (*ep == 'k')
115				bytecnt *= 1024;
116			else if (*ep == 'm')
117				bytecnt *= 1048576;
118			break;
119		case 'p' :      /* pattern matching. */
120			if (regcomp(&rgx, optarg, REG_EXTENDED|REG_NOSUB) != 0)
121				errx(EX_USAGE, "%s: illegal regexp", optarg);
122			pflag = 1;
123			break;
124		case 'l':		/* Line count. */
125			if (numlines != 0)
126				usage();
127			if ((numlines = strtol(optarg, &ep, 10)) <= 0 || *ep)
128				errx(EX_USAGE,
129				    "%s: illegal line count", optarg);
130			break;
131		default:
132			usage();
133		}
134	argv += optind;
135	argc -= optind;
136
137	if (*argv != NULL)
138		if (ifd == -1) {		/* Input file. */
139			if ((ifd = open(*argv, O_RDONLY, 0)) < 0)
140				err(EX_NOINPUT, "%s", *argv);
141			++argv;
142		}
143	if (*argv != NULL)			/* File name prefix. */
144		(void)strcpy(fname, *argv++);
145	if (*argv != NULL)
146		usage();
147
148	if (pflag && (numlines != 0 || bytecnt != 0))
149		usage();
150
151	if (numlines == 0)
152		numlines = DEFLINE;
153	else if (bytecnt != 0)
154		usage();
155
156	if (ifd == -1)				/* Stdin by default. */
157		ifd = 0;
158
159	if (bytecnt) {
160		split1();
161		exit (0);
162	}
163	split2();
164	if (pflag)
165		regfree(&rgx);
166	exit(0);
167}
168
169/*
170 * split1 --
171 *	Split the input by bytes.
172 */
173void
174split1()
175{
176	size_t bcnt;
177	char *C;
178	int dist, len;
179
180	for (bcnt = 0;;)
181		switch ((len = read(ifd, bfr, MAXBSIZE))) {
182		case 0:
183			exit(0);
184		case -1:
185			err(EX_IOERR, "read");
186			/* NOTREACHED */
187		default:
188			if (!file_open)
189				newfile();
190			if (bcnt + len >= (u_int)bytecnt) {
191				dist = bytecnt - bcnt;
192				if (write(ofd, bfr, dist) != dist)
193					err(EX_IOERR, "write");
194				len -= dist;
195				for (C = bfr + dist; len >= bytecnt;
196				    len -= bytecnt, C += bytecnt) {
197					newfile();
198					if (write(ofd,
199					    C, bytecnt) != bytecnt)
200						err(EX_IOERR, "write");
201				}
202				if (len != 0) {
203					newfile();
204					if (write(ofd, C, len) != len)
205						err(EX_IOERR, "write");
206				} else
207					file_open = 0;
208				bcnt = len;
209			} else {
210				bcnt += len;
211				if (write(ofd, bfr, len) != len)
212					err(EX_IOERR, "write");
213			}
214		}
215}
216
217/*
218 * split2 --
219 *	Split the input by lines.
220 */
221void
222split2()
223{
224	long lcnt = 0;
225	FILE *infp;
226
227	/* Stick a stream on top of input file descriptor */
228	if ((infp = fdopen(ifd, "r")) == NULL)
229		err(EX_NOINPUT, "fdopen");
230
231	/* Process input one line at a time */
232	while (fgets(bfr, sizeof(bfr), infp) != NULL) {
233		const int len = strlen(bfr);
234
235		/* If line is too long to deal with, just write it out */
236		if (bfr[len - 1] != '\n')
237			goto writeit;
238
239		/* Check if we need to start a new file */
240		if (pflag) {
241			regmatch_t pmatch;
242
243			pmatch.rm_so = 0;
244			pmatch.rm_eo = len - 1;
245			if (regexec(&rgx, bfr, 0, &pmatch, REG_STARTEND) == 0)
246				newfile();
247		} else if (lcnt++ == numlines) {
248			newfile();
249			lcnt = 1;
250		}
251
252writeit:
253		/* Open output file if needed */
254		if (!file_open)
255			newfile();
256
257		/* Write out line */
258		if (write(ofd, bfr, len) != len)
259			err(EX_IOERR, "write");
260	}
261
262	/* EOF or error? */
263	if (ferror(infp))
264		err(EX_IOERR, "read");
265	else
266		exit(0);
267}
268
269/*
270 * newfile --
271 *	Open a new output file.
272 */
273void
274newfile()
275{
276	static long fnum;
277	static int defname;
278	static char *fpnt;
279
280	if (ofd == -1) {
281		if (fname[0] == '\0') {
282			fname[0] = 'x';
283			fpnt = fname + 1;
284			defname = 1;
285		} else {
286			fpnt = fname + strlen(fname);
287			defname = 0;
288		}
289		ofd = fileno(stdout);
290	}
291	/*
292	 * Hack to increase max files; original code wandered through
293	 * magic characters.  Maximum files is 3 * 26 * 26 == 2028
294	 */
295#define MAXFILES	676
296	if (fnum == MAXFILES) {
297		if (!defname || fname[0] == 'z')
298			errx(EX_DATAERR, "too many files");
299		++fname[0];
300		fnum = 0;
301	}
302	fpnt[0] = fnum / 26 + 'a';
303	fpnt[1] = fnum % 26 + 'a';
304	++fnum;
305	if (!freopen(fname, "w", stdout))
306		err(EX_IOERR, "%s", fname);
307	file_open = 1;
308}
309
310static void
311usage()
312{
313	(void)fprintf(stderr,
314"usage: split [-b byte_count] [-l line_count] [-p pattern] [file [prefix]]\n");
315	exit(EX_USAGE);
316}
317