summaryrefslogblamecommitdiff
path: root/bin/dd/args.c
blob: 748f52cdae22c82f22c6458cd5969d2d1bccd82f (plain) (tree)
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























































































































































































































































































































































































































































































































                                                                               
/*	$NetBSD: args.c,v 1.40 2019/01/30 01:40:02 mrg Exp $	*/

/*-
 * Copyright (c) 1991, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Keith Muller of the University of California, San Diego and Lance
 * Visser of Convex Computer Corporation.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)args.c	8.3 (Berkeley) 4/2/94";
#else
__RCSID("$NetBSD: args.c,v 1.40 2019/01/30 01:40:02 mrg Exp $");
#endif
#endif /* not lint */

#include <sys/types.h>
#include <sys/time.h>

#ifndef NO_IOFLAG
#include <fcntl.h>
#endif /* NO_IOFLAG */
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "dd.h"
#include "extern.h"

static int	c_arg(const void *, const void *);

#ifdef NO_MSGFMT
static void	f_msgfmt(char *) __dead;
#else
static void	f_msgfmt(char *);
#endif /* NO_MSGFMT */

#ifdef NO_CONV
static void	f_conv(char *) __dead;
#else
static void	f_conv(char *);
static int	c_conv(const void *, const void *);
#endif /* NO_CONV */

#ifdef NO_IOFLAG
static void	f_iflag(char *) __dead;
static void	f_oflag(char *) __dead;
#else
static void	f_iflag(char *);
static void	f_oflag(char *);
static u_int	f_ioflag(char *, u_int);
static int	c_ioflag(const void *, const void *);
#endif /* NO_IOFLAG */

static void	f_bs(char *);
static void	f_cbs(char *);
static void	f_count(char *);
static void	f_files(char *);
static void	f_ibs(char *);
static void	f_if(char *);
static void	f_obs(char *);
static void	f_of(char *);
static void	f_seek(char *);
static void	f_skip(char *);
static void	f_progress(char *);

static const struct arg {
	const char *name;
	void (*f)(char *);
	u_int set, noset;
} args[] = {
     /* the array needs to be sorted by the first column so
	bsearch() can be used to find commands quickly */
	{ "bs",		f_bs,		C_BS,	 C_BS|C_IBS|C_OBS|C_OSYNC },
	{ "cbs",	f_cbs,		C_CBS,	 C_CBS },
	{ "conv",	f_conv,		0,	 0 },
	{ "count",	f_count,	C_COUNT, C_COUNT },
	{ "files",	f_files,	C_FILES, C_FILES },
	{ "ibs",	f_ibs,		C_IBS,	 C_BS|C_IBS },
	{ "if",		f_if,		C_IF,	 C_IF },
	{ "iflag",	f_iflag,	C_IFLAG, C_IFLAG },
	{ "iseek",	f_skip,		C_SKIP,	 C_SKIP },
	{ "msgfmt",	f_msgfmt,	0,	 0 },
	{ "obs",	f_obs,		C_OBS,	 C_BS|C_OBS },
	{ "of",		f_of,		C_OF,	 C_OF },
	{ "oflag",	f_oflag,	C_OFLAG, C_OFLAG },
	{ "oseek",	f_seek,		C_SEEK,	 C_SEEK },
	{ "progress",	f_progress,	0,	 0 },
	{ "seek",	f_seek,		C_SEEK,	 C_SEEK },
	{ "skip",	f_skip,		C_SKIP,	 C_SKIP },
};

/*
 * args -- parse JCL syntax of dd.
 */
void
jcl(char **argv)
{
	struct arg *ap, tmp;
	char *oper, *arg;

	in.dbsz = out.dbsz = 512;

	while ((oper = *++argv) != NULL) {
		if ((oper = strdup(oper)) == NULL) {
			errx(EXIT_FAILURE,
			    "unable to allocate space for the argument %s",
			    *argv);
			/* NOTREACHED */
		}
		if ((arg = strchr(oper, '=')) == NULL) {
			errx(EXIT_FAILURE, "unknown operand %s", oper);
			/* NOTREACHED */
		}
		*arg++ = '\0';
		if (!*arg) {
			errx(EXIT_FAILURE, "no value specified for %s", oper);
			/* NOTREACHED */
		}
		tmp.name = oper;
		if (!(ap = bsearch(&tmp, args,
		    __arraycount(args), sizeof(*args), c_arg))) {
			errx(EXIT_FAILURE, "unknown operand %s", tmp.name);
			/* NOTREACHED */
		}
		if (ddflags & ap->noset) {
			errx(EXIT_FAILURE,
			    "%s: illegal argument combination or already set",
			    tmp.name);
			/* NOTREACHED */
		}
		ddflags |= ap->set;
		ap->f(arg);
	}

	/* Final sanity checks. */

	if (ddflags & C_BS) {
		/*
		 * Bs is turned off by any conversion -- we assume the user
		 * just wanted to set both the input and output block sizes
		 * and didn't want the bs semantics, so we don't warn.
		 */
		if (ddflags & (C_BLOCK | C_LCASE | C_SWAB | C_UCASE |
		    C_UNBLOCK | C_OSYNC | C_ASCII | C_EBCDIC | C_SPARSE)) {
			ddflags &= ~C_BS;
			ddflags |= C_IBS|C_OBS;
		}

		/* Bs supersedes ibs and obs. */
		if (ddflags & C_BS && ddflags & (C_IBS|C_OBS))
			warnx("bs supersedes ibs and obs");
	}

	/*
	 * Ascii/ebcdic and cbs implies block/unblock.
	 * Block/unblock requires cbs and vice-versa.
	 */
	if (ddflags & (C_BLOCK|C_UNBLOCK)) {
		if (!(ddflags & C_CBS)) {
			errx(EXIT_FAILURE, "record operations require cbs");
			/* NOTREACHED */
		}
		cfunc = ddflags & C_BLOCK ? block : unblock;
	} else if (ddflags & C_CBS) {
		if (ddflags & (C_ASCII|C_EBCDIC)) {
			if (ddflags & C_ASCII) {
				ddflags |= C_UNBLOCK;
				cfunc = unblock;
			} else {
				ddflags |= C_BLOCK;
				cfunc = block;
			}
		} else {
			errx(EXIT_FAILURE,
			    "cbs meaningless if not doing record operations");
			/* NOTREACHED */
		}
	} else
		cfunc = def;

	/* Read, write and seek calls take off_t as arguments.
	 *
	 * The following check is not done because an off_t is a quad
	 *  for current NetBSD implementations.
	 *
	 * if (in.offset > INT_MAX/in.dbsz || out.offset > INT_MAX/out.dbsz)
	 *	errx(1, "seek offsets cannot be larger than %d", INT_MAX);
	 */
}

static int
c_arg(const void *a, const void *b)
{

	return (strcmp(((const struct arg *)a)->name,
	    ((const struct arg *)b)->name));
}

static void
f_bs(char *arg)
{

	in.dbsz = out.dbsz = strsuftoll("block size", arg, 1, UINT_MAX);
}

static void
f_cbs(char *arg)
{

	cbsz = strsuftoll("conversion record size", arg, 1, UINT_MAX);
}

static void
f_count(char *arg)
{

	cpy_cnt = strsuftoll("block count", arg, 0, LLONG_MAX);
	if (!cpy_cnt)
		terminate(0);
}

static void
f_files(char *arg)
{

	files_cnt = (u_int)strsuftoll("file count", arg, 0, UINT_MAX);
	if (!files_cnt)
		terminate(0);
}

static void
f_ibs(char *arg)
{

	if (!(ddflags & C_BS))
		in.dbsz = strsuftoll("input block size", arg, 1, UINT_MAX);
}

static void
f_if(char *arg)
{

	in.name = arg;
}

#ifdef NO_MSGFMT
/* Build a small version (i.e. for a ramdisk root) */
static void
f_msgfmt(char *arg)
{

	errx(EXIT_FAILURE, "msgfmt option disabled");
	/* NOTREACHED */
}
#else	/* NO_MSGFMT */
static void
f_msgfmt(char *arg)
{

	/*
	 * If the format string is not valid, dd_write_msg() will print
	 * an error and exit.
	 */
	dd_write_msg(arg, 0);

	msgfmt = arg;
}
#endif	/* NO_MSGFMT */

static void
f_obs(char *arg)
{

	if (!(ddflags & C_BS))
		out.dbsz = strsuftoll("output block size", arg, 1, UINT_MAX);
}

static void
f_of(char *arg)
{

	out.name = arg;
}

static void
f_seek(char *arg)
{

	out.offset = strsuftoll("seek blocks", arg, 0, LLONG_MAX);
}

static void
f_skip(char *arg)
{

	in.offset = strsuftoll("skip blocks", arg, 0, LLONG_MAX);
}

static void
f_progress(char *arg)
{

	progress = strsuftoll("progress blocks", arg, 0, LLONG_MAX);
}

#ifdef	NO_CONV
/* Build a small version (i.e. for a ramdisk root) */
static void
f_conv(char *arg)
{

	errx(EXIT_FAILURE, "conv option disabled");
	/* NOTREACHED */
}
#else	/* NO_CONV */

static const struct conv {
	const char *name;
	u_int set, noset;
	const u_char *ctab;
} clist[] = {
	{ "ascii",	C_ASCII,	C_EBCDIC,	e2a_POSIX },
	{ "block",	C_BLOCK,	C_UNBLOCK,	NULL },
	{ "ebcdic",	C_EBCDIC,	C_ASCII,	a2e_POSIX },
	{ "ibm",	C_EBCDIC,	C_ASCII,	a2ibm_POSIX },
	{ "lcase",	C_LCASE,	C_UCASE,	NULL },
	{ "noerror",	C_NOERROR,	0,		NULL },
	{ "notrunc",	C_NOTRUNC,	0,		NULL },
	{ "oldascii",	C_ASCII,	C_EBCDIC,	e2a_32V },
	{ "oldebcdic",	C_EBCDIC,	C_ASCII,	a2e_32V },
	{ "oldibm",	C_EBCDIC,	C_ASCII,	a2ibm_32V },
	{ "osync",	C_OSYNC,	C_BS,		NULL },
	{ "sparse",	C_SPARSE,	0,		NULL },
	{ "swab",	C_SWAB,		0,		NULL },
	{ "sync",	C_SYNC,		0,		NULL },
	{ "ucase",	C_UCASE,	C_LCASE,	NULL },
	{ "unblock",	C_UNBLOCK,	C_BLOCK,	NULL },
	/* If you add items to this table, be sure to add the
	 * conversions to the C_BS check in the jcl routine above.
	 */
};

static void
f_conv(char *arg)
{
	struct conv *cp, tmp;

	while (arg != NULL) {
		tmp.name = strsep(&arg, ",");
		if (!(cp = bsearch(&tmp, clist,
		    __arraycount(clist), sizeof(*clist), c_conv))) {
			errx(EXIT_FAILURE, "unknown conversion %s", tmp.name);
			/* NOTREACHED */
		}
		if (ddflags & cp->noset) {
			errx(EXIT_FAILURE,
			    "%s: illegal conversion combination", tmp.name);
			/* NOTREACHED */
		}
		ddflags |= cp->set;
		if (cp->ctab)
			ctab = cp->ctab;
	}
}

static int
c_conv(const void *a, const void *b)
{

	return (strcmp(((const struct conv *)a)->name,
	    ((const struct conv *)b)->name));
}

#endif	/* NO_CONV */

static void
f_iflag(char *arg)
{
/* Build a small version (i.e. for a ramdisk root) */
#ifdef	NO_IOFLAG
	errx(EXIT_FAILURE, "iflag option disabled");
	/* NOTREACHED */
#else
	iflag = f_ioflag(arg, C_IFLAG);
	return;
#endif
}

static void
f_oflag(char *arg)
{
/* Build a small version (i.e. for a ramdisk root) */
#ifdef	NO_IOFLAG
	errx(EXIT_FAILURE, "oflag option disabled");
	/* NOTREACHED */
#else
	oflag = f_ioflag(arg, C_OFLAG);
	return;
#endif
}

#ifndef	NO_IOFLAG
static const struct ioflag {
	const char *name;
	u_int set;
	u_int allowed;
} olist[] = {
     /* the array needs to be sorted by the first column so
	bsearch() can be used to find commands quickly */
	{ "alt_io",	O_ALT_IO,	C_IFLAG|C_OFLAG	},
	{ "append",	O_APPEND,	C_OFLAG		},
	{ "async",	O_ASYNC,	C_IFLAG|C_OFLAG	},
	{ "cloexec",	O_CLOEXEC,	C_IFLAG|C_OFLAG	},
	{ "creat",	O_CREAT,	C_OFLAG		},
	{ "direct",	O_DIRECT,	C_IFLAG|C_OFLAG	},
	{ "directory",	O_DIRECTORY,	C_NONE		},
	{ "dsync",	O_DSYNC,	C_OFLAG		},
	{ "excl",	O_EXCL,		C_OFLAG		},
	{ "exlock",	O_EXLOCK,	C_IFLAG|C_OFLAG	},
	{ "noctty",	O_NOCTTY,	C_IFLAG|C_OFLAG	},
	{ "nofollow",	O_NOFOLLOW,	C_IFLAG|C_OFLAG	},
	{ "nonblock",	O_NONBLOCK,	C_IFLAG|C_OFLAG	},
	{ "nosigpipe",	O_NOSIGPIPE,	C_IFLAG|C_OFLAG	},
	{ "rdonly",	O_RDONLY,	C_IFLAG		},
	{ "rdwr",	O_RDWR,		C_IFLAG		},
	{ "rsync",	O_RSYNC,	C_IFLAG		},
	{ "shlock",	O_SHLOCK,	C_IFLAG|C_OFLAG	},
	{ "sync",	O_SYNC,		C_IFLAG|C_OFLAG	},
	{ "trunc",	O_TRUNC,	C_OFLAG		},
	{ "wronly",	O_WRONLY,	C_OFLAG		},
};

static u_int
f_ioflag(char *arg, u_int flagtype)
{
	u_int ioflag = 0;
	struct ioflag *cp, tmp;
	const char *flagstr = (flagtype == C_IFLAG) ? "iflag" : "oflag";

	while (arg != NULL) {
		tmp.name = strsep(&arg, ",");
		if (!(cp = bsearch(&tmp, olist,
		    __arraycount(olist), sizeof(*olist), c_ioflag))) {
			errx(EXIT_FAILURE, "unknown %s %s", flagstr, tmp.name);
			/* NOTREACHED */
		}

		if ((cp->set & O_ACCMODE) && (flagtype == C_OFLAG)) {
			warnx("rdonly, rdwr and wronly are ignored for oflag");
			continue;
		}

		if ((cp->allowed & flagtype) == 0) {
			warnx("%s set for %s but makes no sense",
			      cp->name, flagstr);
		}
		
		ioflag |= cp->set;
	}


	return ioflag;
}

static int
c_ioflag(const void *a, const void *b)
{

	return (strcmp(((const struct ioflag *)a)->name,
	    ((const struct ioflag *)b)->name));
}
#endif	/* NO_IOFLAG */