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args.c revision 1.22 
      1 /*	$NetBSD: args.c,v 1.22 2003/08/04 22:31:23 jschauma Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1991, 1993, 1994
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Keith Muller of the University of California, San Diego and Lance
      9  * Visser of Convex Computer Corporation.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  * 3. All advertising materials mentioning features or use of this software
     20  *    must display the following acknowledgement:
     21  *	This product includes software developed by the University of
     22  *	California, Berkeley and its contributors.
     23  * 4. Neither the name of the University nor the names of its contributors
     24  *    may be used to endorse or promote products derived from this software
     25  *    without specific prior written permission.
     26  *
     27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     37  * SUCH DAMAGE.
     38  */
     39 
     40 #include <sys/cdefs.h>
     41 #ifndef lint
     42 #if 0
     43 static char sccsid[] = "@(#)args.c	8.3 (Berkeley) 4/2/94";
     44 #else
     45 __RCSID("$NetBSD: args.c,v 1.22 2003/08/04 22:31:23 jschauma Exp $");
     46 #endif
     47 #endif /* not lint */
     48 
     49 #include <sys/types.h>
     50 #include <sys/time.h>
     51 
     52 #include <err.h>
     53 #include <errno.h>
     54 #include <limits.h>
     55 #include <stdio.h>
     56 #include <stdlib.h>
     57 #include <string.h>
     58 
     59 #include "dd.h"
     60 #include "extern.h"
     61 
     62 static int	c_arg(const void *, const void *);
     63 #ifndef	NO_CONV
     64 static int	c_conv(const void *, const void *);
     65 #endif
     66 static void	f_bs(char *);
     67 static void	f_cbs(char *);
     68 static void	f_conv(char *);
     69 static void	f_count(char *);
     70 static void	f_files(char *);
     71 static void	f_ibs(char *);
     72 static void	f_if(char *);
     73 static void	f_obs(char *);
     74 static void	f_of(char *);
     75 static void	f_seek(char *);
     76 static void	f_skip(char *);
     77 static void	f_progress(char *);
     78 
     79 static const struct arg {
     80 	const char *name;
     81 	void (*f)(char *);
     82 	u_int set, noset;
     83 } args[] = {
     84      /* the array needs to be sorted by the first column so
     85 	bsearch() can be used to find commands quickly */
     86 	{ "bs",		f_bs,		C_BS,	 C_BS|C_IBS|C_OBS|C_OSYNC },
     87 	{ "cbs",	f_cbs,		C_CBS,	 C_CBS },
     88 	{ "conv",	f_conv,		0,	 0 },
     89 	{ "count",	f_count,	C_COUNT, C_COUNT },
     90 	{ "files",	f_files,	C_FILES, C_FILES },
     91 	{ "ibs",	f_ibs,		C_IBS,	 C_BS|C_IBS },
     92 	{ "if",		f_if,		C_IF,	 C_IF },
     93 	{ "obs",	f_obs,		C_OBS,	 C_BS|C_OBS },
     94 	{ "of",		f_of,		C_OF,	 C_OF },
     95 	{ "progress",	f_progress,	0,	 0 },
     96 	{ "seek",	f_seek,		C_SEEK,	 C_SEEK },
     97 	{ "skip",	f_skip,		C_SKIP,	 C_SKIP },
     98 };
     99 
    100 /*
    101  * args -- parse JCL syntax of dd.
    102  */
    103 void
    104 jcl(char **argv)
    105 {
    106 	struct arg *ap, tmp;
    107 	char *oper, *arg;
    108 
    109 	in.dbsz = out.dbsz = 512;
    110 
    111 	while ((oper = *++argv) != NULL) {
    112 		if ((arg = strchr(oper, '=')) == NULL) {
    113 			errx(EXIT_FAILURE, "unknown operand %s", oper);
    114 			/* NOTREACHED */
    115 		}
    116 		*arg++ = '\0';
    117 		if (!*arg) {
    118 			errx(EXIT_FAILURE, "no value specified for %s", oper);
    119 			/* NOTREACHED */
    120 		}
    121 		tmp.name = oper;
    122 		if (!(ap = (struct arg *)bsearch(&tmp, args,
    123 		    sizeof(args)/sizeof(struct arg), sizeof(struct arg),
    124 		    c_arg))) {
    125 			errx(EXIT_FAILURE, "unknown operand %s", tmp.name);
    126 			/* NOTREACHED */
    127 		}
    128 		if (ddflags & ap->noset) {
    129 			errx(EXIT_FAILURE,
    130 			    "%s: illegal argument combination or already set",
    131 			    tmp.name);
    132 			/* NOTREACHED */
    133 		}
    134 		ddflags |= ap->set;
    135 		ap->f(arg);
    136 	}
    137 
    138 	/* Final sanity checks. */
    139 
    140 	if (ddflags & C_BS) {
    141 		/*
    142 		 * Bs is turned off by any conversion -- we assume the user
    143 		 * just wanted to set both the input and output block sizes
    144 		 * and didn't want the bs semantics, so we don't warn.
    145 		 */
    146 		if (ddflags & (C_BLOCK|C_LCASE|C_SWAB|C_UCASE|C_UNBLOCK))
    147 			ddflags &= ~C_BS;
    148 
    149 		/* Bs supersedes ibs and obs. */
    150 		if (ddflags & C_BS && ddflags & (C_IBS|C_OBS))
    151 			warnx("bs supersedes ibs and obs");
    152 	}
    153 
    154 	/*
    155 	 * Ascii/ebcdic and cbs implies block/unblock.
    156 	 * Block/unblock requires cbs and vice-versa.
    157 	 */
    158 	if (ddflags & (C_BLOCK|C_UNBLOCK)) {
    159 		if (!(ddflags & C_CBS)) {
    160 			errx(EXIT_FAILURE, "record operations require cbs");
    161 			/* NOTREACHED */
    162 		}
    163 		cfunc = ddflags & C_BLOCK ? block : unblock;
    164 	} else if (ddflags & C_CBS) {
    165 		if (ddflags & (C_ASCII|C_EBCDIC)) {
    166 			if (ddflags & C_ASCII) {
    167 				ddflags |= C_UNBLOCK;
    168 				cfunc = unblock;
    169 			} else {
    170 				ddflags |= C_BLOCK;
    171 				cfunc = block;
    172 			}
    173 		} else {
    174 			errx(EXIT_FAILURE,
    175 			    "cbs meaningless if not doing record operations");
    176 			/* NOTREACHED */
    177 		}
    178 	} else
    179 		cfunc = def;
    180 
    181 	/* Read, write and seek calls take off_t as arguments.
    182 	 *
    183 	 * The following check is not done because an off_t is a quad
    184 	 *  for current NetBSD implementations.
    185 	 *
    186 	 * if (in.offset > INT_MAX/in.dbsz || out.offset > INT_MAX/out.dbsz)
    187 	 *	errx(1, "seek offsets cannot be larger than %d", INT_MAX);
    188 	 */
    189 }
    190 
    191 static int
    192 c_arg(const void *a, const void *b)
    193 {
    194 
    195 	return (strcmp(((const struct arg *)a)->name,
    196 	    ((const struct arg *)b)->name));
    197 }
    198 
    199 static void
    200 f_bs(char *arg)
    201 {
    202 
    203 	in.dbsz = out.dbsz = strsuftoll("block size", arg, 1, UINT_MAX);
    204 }
    205 
    206 static void
    207 f_cbs(char *arg)
    208 {
    209 
    210 	cbsz = strsuftoll("conversion record size", arg, 1, UINT_MAX);
    211 }
    212 
    213 static void
    214 f_count(char *arg)
    215 {
    216 
    217 	cpy_cnt = strsuftoll("block count", arg, 0, LLONG_MAX);
    218 	if (!cpy_cnt)
    219 		terminate(0);
    220 }
    221 
    222 static void
    223 f_files(char *arg)
    224 {
    225 
    226 	files_cnt = (u_int)strsuftoll("file count", arg, 0, UINT_MAX);
    227 	if (!files_cnt)
    228 		terminate(0);
    229 }
    230 
    231 static void
    232 f_ibs(char *arg)
    233 {
    234 
    235 	if (!(ddflags & C_BS))
    236 		in.dbsz = strsuftoll("input block size", arg, 1, UINT_MAX);
    237 }
    238 
    239 static void
    240 f_if(char *arg)
    241 {
    242 
    243 	in.name = arg;
    244 }
    245 
    246 static void
    247 f_obs(char *arg)
    248 {
    249 
    250 	if (!(ddflags & C_BS))
    251 		out.dbsz = strsuftoll("output block size", arg, 1, UINT_MAX);
    252 }
    253 
    254 static void
    255 f_of(char *arg)
    256 {
    257 
    258 	out.name = arg;
    259 }
    260 
    261 static void
    262 f_seek(char *arg)
    263 {
    264 
    265 	out.offset = strsuftoll("seek blocks", arg, 0, LLONG_MAX);
    266 }
    267 
    268 static void
    269 f_skip(char *arg)
    270 {
    271 
    272 	in.offset = strsuftoll("skip blocks", arg, 0, LLONG_MAX);
    273 }
    274 
    275 static void
    276 f_progress(char *arg)
    277 {
    278 
    279 	if (*arg != '0')
    280 		progress = 1;
    281 }
    282 
    283 #ifdef	NO_CONV
    284 /* Build a small version (i.e. for a ramdisk root) */
    285 static void
    286 f_conv(char *arg)
    287 {
    288 
    289 	errx(EXIT_FAILURE, "conv option disabled");
    290 	/* NOTREACHED */
    291 }
    292 #else	/* NO_CONV */
    293 
    294 static const struct conv {
    295 	const char *name;
    296 	u_int set, noset;
    297 	const u_char *ctab;
    298 } clist[] = {
    299 	{ "ascii",	C_ASCII,	C_EBCDIC,	e2a_POSIX },
    300 	{ "block",	C_BLOCK,	C_UNBLOCK,	NULL },
    301 	{ "ebcdic",	C_EBCDIC,	C_ASCII,	a2e_POSIX },
    302 	{ "ibm",	C_EBCDIC,	C_ASCII,	a2ibm_POSIX },
    303 	{ "lcase",	C_LCASE,	C_UCASE,	NULL },
    304 	{ "noerror",	C_NOERROR,	0,		NULL },
    305 	{ "notrunc",	C_NOTRUNC,	0,		NULL },
    306 	{ "oldascii",	C_ASCII,	C_EBCDIC,	e2a_32V },
    307 	{ "oldebcdic",	C_EBCDIC,	C_ASCII,	a2e_32V },
    308 	{ "oldibm",	C_EBCDIC,	C_ASCII,	a2ibm_32V },
    309 	{ "osync",	C_OSYNC,	C_BS,		NULL },
    310 	{ "swab",	C_SWAB,		0,		NULL },
    311 	{ "sync",	C_SYNC,		0,		NULL },
    312 	{ "ucase",	C_UCASE,	C_LCASE,	NULL },
    313 	{ "unblock",	C_UNBLOCK,	C_BLOCK,	NULL },
    314 };
    315 
    316 static void
    317 f_conv(char *arg)
    318 {
    319 	struct conv *cp, tmp;
    320 
    321 	while (arg != NULL) {
    322 		tmp.name = strsep(&arg, ",");
    323 		if (!(cp = (struct conv *)bsearch(&tmp, clist,
    324 		    sizeof(clist)/sizeof(struct conv), sizeof(struct conv),
    325 		    c_conv))) {
    326 			errx(EXIT_FAILURE, "unknown conversion %s", tmp.name);
    327 			/* NOTREACHED */
    328 		}
    329 		if (ddflags & cp->noset) {
    330 			errx(EXIT_FAILURE, "%s: illegal conversion combination", tmp.name);
    331 			/* NOTREACHED */
    332 		}
    333 		ddflags |= cp->set;
    334 		if (cp->ctab)
    335 			ctab = cp->ctab;
    336 	}
    337 }
    338 
    339 static int
    340 c_conv(const void *a, const void *b)
    341 {
    342 
    343 	return (strcmp(((const struct conv *)a)->name,
    344 	    ((const struct conv *)b)->name));
    345 }
    346 
    347 #endif	/* NO_CONV */
    348