split.c revision 1.14 1 /* $NetBSD: split.c,v 1.14 2003/06/26 22:49:53 bjh21 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. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include <sys/cdefs.h>
37 #ifndef lint
38 __COPYRIGHT("@(#) Copyright (c) 1987, 1993, 1994\n\
39 The Regents of the University of California. All rights reserved.\n");
40 #endif /* not lint */
41
42 #ifndef lint
43 #if 0
44 static char sccsid[] = "@(#)split.c 8.3 (Berkeley) 4/25/94";
45 #endif
46 __RCSID("$NetBSD: split.c,v 1.14 2003/06/26 22:49:53 bjh21 Exp $");
47 #endif /* not lint */
48
49 #include <sys/param.h>
50
51 #include <ctype.h>
52 #include <err.h>
53 #include <errno.h>
54 #include <fcntl.h>
55 #include <stdio.h>
56 #include <stdlib.h>
57 #include <string.h>
58 #include <unistd.h>
59
60 #define DEFLINE 1000 /* Default num lines per file. */
61
62 static int file_open; /* If a file open. */
63 static int ifd = -1, ofd = -1; /* Input/output file descriptors. */
64 static char *fname; /* File name prefix. */
65 static size_t sfxlen = 2; /* suffix length. */
66
67 int main(int, char **);
68 static void newfile(void);
69 static void split1(off_t);
70 static void split2(off_t);
71 static void usage(void) __attribute__((__noreturn__));
72 static size_t bigwrite(int, void const *, size_t);
73
74 int
75 main(int argc, char *argv[])
76 {
77 int ch;
78 char *ep, *p;
79 off_t bytecnt = 0; /* Byte count to split on. */
80 off_t numlines = 0; /* Line count to split on. */
81 size_t namelen;
82 long name_max;
83
84 while ((ch = getopt(argc, argv, "-0123456789b:l:a:")) != -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 p++;
96 else
97 p = argv[optind] + 1;
98 numlines = strtoull(p, &ep, 10);
99 if (numlines == 0 || *ep != '\0')
100 errx(1, "%s: illegal line count.", p);
101 }
102 break;
103 case '-': /* stdin flag. */
104 if (ifd != -1)
105 usage();
106 ifd = 0;
107 break;
108 case 'b': /* Byte count. */
109 if (!isdigit((unsigned char)optarg[0]) ||
110 (bytecnt = strtoull(optarg, &ep, 10)) == 0 ||
111 (*ep != '\0' && *ep != 'k' && *ep != 'm'))
112 errx(1, "%s: illegal byte count.", optarg);
113 if (*ep == 'k')
114 bytecnt *= 1024;
115 else if (*ep == 'm')
116 bytecnt *= 1024 * 1024;
117 break;
118 case 'l': /* Line count. */
119 if (numlines != 0)
120 usage();
121 if (!isdigit((unsigned char)optarg[0]) ||
122 (numlines = strtoull(optarg, &ep, 10)) == 0 ||
123 *ep != '\0')
124 errx(1, "%s: illegal line count.", optarg);
125 break;
126 case 'a': /* Suffix length. */
127 if (!isdigit((unsigned char)optarg[0]) ||
128 (sfxlen = (size_t)strtoul(optarg, &ep, 10)) == 0 ||
129 *ep != '\0')
130 errx(1, "%s: illegal suffix length.", optarg);
131 break;
132 default:
133 usage();
134 }
135 argv += optind;
136 argc -= optind;
137
138 if (*argv != NULL)
139 if (ifd == -1) { /* Input file. */
140 if (strcmp(*argv, "-") == 0)
141 ifd = STDIN_FILENO;
142 else if ((ifd = open(*argv, O_RDONLY, 0)) < 0)
143 err(1, "%s", *argv);
144 ++argv;
145 }
146
147 errno = 0;
148 if ((name_max = pathconf(".", _PC_NAME_MAX)) == -1 &&
149 errno != 0)
150 err(EXIT_FAILURE, "pathconf");
151 if (*argv != NULL) {
152 namelen = strlen(*argv) + sfxlen;
153 if (name_max != -1 && namelen > name_max)
154 errx(EXIT_FAILURE, "Output file name too long");
155 if ((fname = malloc(namelen + 1)) == NULL)
156 err(EXIT_FAILURE, NULL);
157 (void)strcpy(fname, *argv++); /* File name prefix. */
158 } else {
159 if (name_max != -1 && 1 + sfxlen > name_max)
160 errx(EXIT_FAILURE, "Output file name too long");
161 if ((fname = malloc(sfxlen + 2)) == NULL)
162 err(EXIT_FAILURE, NULL);
163 fname[0] = '\0';
164 }
165
166 if (*argv != NULL)
167 usage();
168
169 if (numlines == 0)
170 numlines = DEFLINE;
171 else if (bytecnt)
172 usage();
173
174 if (ifd == -1) /* Stdin by default. */
175 ifd = 0;
176
177 if (bytecnt)
178 split1(bytecnt);
179 else
180 split2(numlines);
181
182 return 0;
183 }
184
185 /*
186 * split1 --
187 * Split the input by bytes.
188 */
189 static void
190 split1(off_t bytecnt)
191 {
192 off_t bcnt;
193 ssize_t dist, len;
194 char *C;
195 char bfr[MAXBSIZE];
196
197 for (bcnt = 0;;)
198 switch (len = read(ifd, bfr, MAXBSIZE)) {
199 case 0:
200 exit(0);
201 /* NOTREACHED */
202 case -1:
203 err(1, "read");
204 /* NOTREACHED */
205 default:
206 if (!file_open) {
207 newfile();
208 file_open = 1;
209 }
210 if (bcnt + len >= bytecnt) {
211 /* LINTED: bytecnt - bcnt <= len */
212 dist = bytecnt - bcnt;
213 if (bigwrite(ofd, bfr, dist) != dist)
214 err(1, "write");
215 len -= dist;
216 for (C = bfr + dist; len >= bytecnt;
217 /* LINTED: bytecnt <= len */
218 len -= bytecnt, C += bytecnt) {
219 newfile();
220 /* LINTED: as above */
221 if (bigwrite(ofd,
222 C, bytecnt) != bytecnt)
223 err(1, "write");
224 }
225 if (len) {
226 newfile();
227 /* LINTED: len >= 0 */
228 if (bigwrite(ofd, C, len) != len)
229 err(1, "write");
230 } else
231 file_open = 0;
232 bcnt = len;
233 } else {
234 bcnt += len;
235 /* LINTED: len >= 0 */
236 if (bigwrite(ofd, bfr, len) != len)
237 err(1, "write");
238 }
239 }
240 }
241
242 /*
243 * split2 --
244 * Split the input by lines.
245 */
246 static void
247 split2(off_t numlines)
248 {
249 off_t lcnt;
250 size_t bcnt;
251 ssize_t len;
252 char *Ce, *Cs;
253 char bfr[MAXBSIZE];
254
255 for (lcnt = 0;;)
256 switch (len = read(ifd, bfr, MAXBSIZE)) {
257 case 0:
258 exit(0);
259 /* NOTREACHED */
260 case -1:
261 err(1, "read");
262 /* NOTREACHED */
263 default:
264 if (!file_open) {
265 newfile();
266 file_open = 1;
267 }
268 for (Cs = Ce = bfr; len--; Ce++)
269 if (*Ce == '\n' && ++lcnt == numlines) {
270 bcnt = Ce - Cs + 1;
271 if (bigwrite(ofd, Cs, bcnt) != bcnt)
272 err(1, "write");
273 lcnt = 0;
274 Cs = Ce + 1;
275 if (len)
276 newfile();
277 else
278 file_open = 0;
279 }
280 if (Cs < Ce) {
281 bcnt = Ce - Cs;
282 if (bigwrite(ofd, Cs, bcnt) != bcnt)
283 err(1, "write");
284 }
285 }
286 }
287
288 /*
289 * newfile --
290 * Open a new output file.
291 */
292 static void
293 newfile(void)
294 {
295 static int fnum;
296 static int defname;
297 static char *fpnt;
298 int quot, i;
299
300 if (ofd == -1) {
301 if (fname[0] == '\0') {
302 fname[0] = 'x';
303 fpnt = fname + 1;
304 defname = 1;
305 } else {
306 fpnt = fname + strlen(fname);
307 defname = 0;
308 }
309 ofd = fileno(stdout);
310 }
311 /*
312 * Hack to increase max files; original code wandered through
313 * magic characters. Maximum files is 3 * 26 * 26 == 2028
314 */
315 fpnt[sfxlen] = '\0';
316 quot = fnum;
317 for (i = sfxlen - 1; i >= 0; i--) {
318 fpnt[i] = quot % 26 + 'a';
319 quot = quot / 26;
320 }
321 if (quot > 0) {
322 if (!defname || fname[0] == 'z')
323 errx(1, "too many files.");
324 ++fname[0];
325 fnum = 0;
326 }
327 ++fnum;
328 if (!freopen(fname, "w", stdout))
329 err(1, "%s", fname);
330 }
331
332 static size_t
333 bigwrite(int fd, const void *buf, size_t len)
334 {
335 const char *ptr = buf;
336 size_t sofar = 0;
337 ssize_t w;
338
339 while (len != 0) {
340 if ((w = write(fd, ptr, len)) == -1)
341 return sofar;
342 len -= w;
343 ptr += w;
344 sofar += w;
345 }
346 return sofar;
347 }
348
349
350 static void
351 usage(void)
352 {
353 (void)fprintf(stderr,
354 "Usage: %s [-b byte_count] [-l line_count] [-a suffix_length] "
355 "[file [prefix]]\n", getprogname());
356 exit(1);
357 }
358