1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
|
/* split.c -- split a file into pieces.
Copyright (C) 1988, 1991 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
/* By tege@sics.se, with rms.
To do:
* Implement -t CHAR or -t REGEX to specify break characters other
than newline. */
#include <stdio.h>
#include <getopt.h>
#include <sys/types.h>
#include "system.h"
#include "version.h"
char *xmalloc ();
void error ();
static int convint ();
static int isdigits ();
static int stdread ();
static void line_bytes_split ();
static void bytes_split ();
static void cwrite ();
static void lines_split ();
static void next_file_name ();
/* The name this program was run with. */
char *program_name;
/* Base name of output files. */
static char *outfile;
/* Pointer to the end of the prefix in OUTFILE.
Suffixes are inserted here. */
static char *outfile_mid;
/* Pointer to the end of OUTFILE. */
static char *outfile_end;
/* Status for outfile name generation. */
static unsigned outfile_count = -1;
static unsigned outfile_name_limit = 25 * 26;
static unsigned outfile_name_generation = 1;
/* Name of input file. May be "-". */
static char *infile;
/* Descriptor on which input file is open. */
static int input_desc;
/* Descriptor on which output file is open. */
static int output_desc;
/* If non-zero, display usage information and exit. */
static int flag_help;
/* If non-zero, print the version on standard error. */
static int flag_version;
static struct option const longopts[] =
{
{"bytes", required_argument, NULL, 'b'},
{"lines", required_argument, NULL, 'l'},
{"line-bytes", required_argument, NULL, 'C'},
{"help", no_argument, &flag_help, 1},
{"version", no_argument, &flag_version, 1},
{NULL, 0, NULL, 0}
};
static void
usage (reason)
char *reason;
{
if (reason != NULL)
fprintf (stderr, "%s: %s\n", program_name, reason);
fprintf (stderr, "\
Usage: %s [-lines] [-l lines] [-b bytes[bkm]] [-C bytes[bkm]]\n\
[--lines=lines] [--bytes=bytes[bkm]] [--line-bytes=bytes[bkm]]\n\
[--help] [--version] [infile [outfile-prefix]]\n",
program_name);
exit (2);
}
void
main (argc, argv)
int argc;
char *argv[];
{
struct stat stat_buf;
int num; /* numeric argument from command line */
enum
{
type_undef, type_bytes, type_byteslines, type_lines, type_digits
} split_type = type_undef;
int in_blk_size; /* optimal block size of input file device */
char *buf; /* file i/o buffer */
int accum = 0;
char *outbase;
int c;
int digits_optind = 0;
program_name = argv[0];
/* Parse command line options. */
infile = "-";
outbase = "x";
while (1)
{
/* This is the argv-index of the option we will read next. */
int this_optind = optind ? optind : 1;
c = getopt_long (argc, argv, "0123456789b:l:C:", longopts, (int *) 0);
if (c == EOF)
break;
switch (c)
{
case 0:
break;
case 'b':
if (split_type != type_undef)
usage ("cannot split in more than one way");
split_type = type_bytes;
if (convint (optarg, &accum) == -1)
usage ("invalid number of bytes");
break;
case 'l':
if (split_type != type_undef)
usage ("cannot split in more than one way");
split_type = type_lines;
if (!isdigits (optarg))
usage ("invalid number of lines");
accum = atoi (optarg);
break;
case 'C':
if (split_type != type_undef)
usage ("cannot split in more than one way");
split_type = type_byteslines;
if (convint (optarg, &accum) == -1)
usage ("invalid number of bytes");
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
if (split_type != type_undef && split_type != type_digits)
usage ("cannot split in more than one way");
if (digits_optind != 0 && digits_optind != this_optind)
accum = 0; /* More than one number given; ignore other. */
digits_optind = this_optind;
split_type = type_digits;
accum = accum * 10 + c - '0';
break;
default:
usage ((char *)0);
}
}
if (flag_version)
{
fprintf (stderr, "%s\n", version_string);
exit (0);
}
if (flag_help)
usage ((char *)0);
/* Handle default case. */
if (split_type == type_undef)
{
split_type = type_lines;
accum = 1000;
}
if (accum < 1)
usage ("invalid number");
num = accum;
/* Get out the filename arguments. */
if (optind < argc)
infile = argv[optind++];
if (optind < argc)
outbase = argv[optind++];
if (optind < argc)
usage ("too many arguments");
/* Open the input file. */
if (!strcmp (infile, "-"))
input_desc = 0;
else
{
input_desc = open (infile, O_RDONLY);
if (input_desc < 0)
error (1, errno, "%s", infile);
}
/* No output file is open now. */
output_desc = -1;
/* Copy the output file prefix so we can add suffixes to it.
26**29 is certainly enough output files! */
outfile = xmalloc (strlen (outbase) + 30);
strcpy (outfile, outbase);
outfile_mid = outfile + strlen (outfile);
outfile_end = outfile_mid + 2;
bzero (outfile_mid, 30);
outfile_mid[0] = 'a';
outfile_mid[1] = 'a' - 1; /* first call to next_file_name makes it an 'a' */
/* Get the optimal block size of input device and make a buffer. */
if (fstat (input_desc, &stat_buf) < 0)
error (1, errno, "%s", infile);
in_blk_size = ST_BLKSIZE (stat_buf);
buf = xmalloc (in_blk_size + 1);
switch (split_type)
{
case type_digits:
case type_lines:
lines_split (num, buf, in_blk_size);
break;
case type_bytes:
bytes_split (num, buf, in_blk_size);
break;
case type_byteslines:
line_bytes_split (num);
break;
default:
abort ();
}
if (close (input_desc) < 0)
error (1, errno, "%s", infile);
if (output_desc >= 0 && close (output_desc) < 0)
error (1, errno, "%s", outfile);
exit (0);
}
/* Return nonzero if the string STR is composed entirely of decimal digits. */
static int
isdigits (str)
char *str;
{
do
{
if (!ISDIGIT (*str))
return 0;
str++;
}
while (*str);
return 1;
}
/* Put the value of the number in STR into *VAL.
STR can specify a positive integer, optionally ending in `k'
to mean kilo or `m' to mean mega.
Return 0 if STR is valid, -1 if not. */
static int
convint (str, val)
char *str;
int *val;
{
int multiplier = 1;
int arglen = strlen (str);
if (arglen > 1)
{
switch (str[arglen - 1])
{
case 'b':
multiplier = 512;
str[arglen - 1] = '\0';
break;
case 'k':
multiplier = 1024;
str[arglen - 1] = '\0';
break;
case 'm':
multiplier = 1048576;
str[arglen - 1] = '\0';
break;
}
}
if (!isdigits (str))
return -1;
*val = atoi (str) * multiplier;
return 0;
}
/* Split into pieces of exactly NCHARS bytes.
Use buffer BUF, whose size is BUFSIZE. */
static void
bytes_split (nchars, buf, bufsize)
int nchars;
char *buf;
int bufsize;
{
int n_read;
int new_file_flag = 1;
int to_read;
int to_write = nchars;
char *bp_out;
do
{
n_read = stdread (buf, bufsize);
if (n_read < 0)
error (1, errno, "%s", infile);
bp_out = buf;
to_read = n_read;
for (;;)
{
if (to_read < to_write)
{
if (to_read) /* do not write 0 bytes! */
{
cwrite (new_file_flag, bp_out, to_read);
to_write -= to_read;
new_file_flag = 0;
}
break;
}
else
{
cwrite (new_file_flag, bp_out, to_write);
bp_out += to_write;
to_read -= to_write;
new_file_flag = 1;
to_write = nchars;
}
}
}
while (n_read == bufsize);
}
/* Split into pieces of exactly NLINES lines.
Use buffer BUF, whose size is BUFSIZE. */
static void
lines_split (nlines, buf, bufsize)
int nlines;
char *buf;
int bufsize;
{
int n_read;
char *bp, *bp_out, *eob;
int new_file_flag = 1;
int n = 0;
do
{
n_read = stdread (buf, bufsize);
if (n_read < 0)
error (1, errno, "%s", infile);
bp = bp_out = buf;
eob = bp + n_read;
*eob = '\n';
for (;;)
{
while (*bp++ != '\n')
; /* this semicolon takes most of the time */
if (bp > eob)
{
if (eob != bp_out) /* do not write 0 bytes! */
{
cwrite (new_file_flag, bp_out, eob - bp_out);
new_file_flag = 0;
}
break;
}
else
if (++n >= nlines)
{
cwrite (new_file_flag, bp_out, bp - bp_out);
bp_out = bp;
new_file_flag = 1;
n = 0;
}
}
}
while (n_read == bufsize);
}
/* Split into pieces that are as large as possible while still not more
than NCHARS bytes, and are split on line boundaries except
where lines longer than NCHARS bytes occur. */
static void
line_bytes_split (nchars)
int nchars;
{
int n_read;
char *bp;
int eof = 0;
int n_buffered = 0;
char *buf = (char *) xmalloc (nchars);
do
{
/* Fill up the full buffer size from the input file. */
n_read = stdread (buf + n_buffered, nchars - n_buffered);
if (n_read < 0)
error (1, errno, "%s", infile);
n_buffered += n_read;
if (n_buffered != nchars)
eof = 1;
/* Find where to end this chunk. */
bp = buf + n_buffered;
if (n_buffered == nchars)
{
while (bp > buf && bp[-1] != '\n')
bp--;
}
/* If chunk has no newlines, use all the chunk. */
if (bp == buf)
bp = buf + n_buffered;
/* Output the chars as one output file. */
cwrite (1, buf, bp - buf);
/* Discard the chars we just output; move rest of chunk
down to be the start of the next chunk. */
n_buffered -= bp - buf;
if (n_buffered > 0)
bcopy (bp, buf, n_buffered);
}
while (!eof);
free (buf);
}
/* Write BYTES bytes at BP to an output file.
If NEW_FILE_FLAG is nonzero, open the next output file.
Otherwise add to the same output file already in use. */
static void
cwrite (new_file_flag, bp, bytes)
int new_file_flag;
char *bp;
int bytes;
{
if (new_file_flag)
{
if (output_desc >= 0 && close (output_desc) < 0)
error (1, errno, "%s", outfile);
next_file_name ();
output_desc = open (outfile, O_WRONLY | O_CREAT | O_TRUNC, 0666);
if (output_desc < 0)
error (1, errno, "%s", outfile);
}
if (write (output_desc, bp, bytes) < 0)
error (1, errno, "%s", outfile);
}
/* Read NCHARS bytes from the input file into BUF.
Return the number of bytes successfully read.
If this is less than NCHARS, do not call `stdread' again. */
static int
stdread (buf, nchars)
char *buf;
int nchars;
{
int n_read;
int to_be_read = nchars;
while (to_be_read)
{
n_read = read (input_desc, buf, to_be_read);
if (n_read < 0)
return -1;
if (n_read == 0)
break;
to_be_read -= n_read;
buf += n_read;
}
return nchars - to_be_read;
}
/* Compute the next sequential output file name suffix and store it
into the string `outfile' at the position pointed to by `outfile_mid'. */
static void
next_file_name ()
{
int x;
char *ne;
outfile_count++;
if (outfile_count < outfile_name_limit)
{
for (ne = outfile_end - 1; ; ne--)
{
x = *ne;
if (x != 'z')
break;
*ne = 'a';
}
*ne = x + 1;
return;
}
outfile_count = 0;
outfile_name_limit *= 26;
outfile_name_generation++;
*outfile_mid++ = 'z';
for (x = 0; x <= outfile_name_generation; x++)
outfile_mid[x] = 'a';
outfile_end += 2;
}
|