1 /*- 2 * Copyright (c) 1991, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Keith Muller of the University of California, San Diego and Lance 7 * Visser of Convex Computer Corporation. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)args.c 8.3 (Berkeley) 4/2/94"; 41 #endif 42 #endif /* not lint */ 43 #include <sys/cdefs.h> 44 __FBSDID("$FreeBSD$"); 45 46 #include <sys/types.h> 47 48 #include <err.h> 49 #include <errno.h> 50 #include <inttypes.h> 51 #include <limits.h> 52 #include <stdlib.h> 53 #include <string.h> 54 55 #include "dd.h" 56 #include "extern.h" 57 58 static int c_arg(const void *, const void *); 59 static int c_conv(const void *, const void *); 60 static void f_bs(char *); 61 static void f_cbs(char *); 62 static void f_conv(char *); 63 static void f_count(char *); 64 static void f_files(char *); 65 static void f_ibs(char *); 66 static void f_if(char *); 67 static void f_obs(char *); 68 static void f_of(char *); 69 static void f_seek(char *); 70 static void f_skip(char *); 71 static uintmax_t get_num(const char *); 72 static off_t get_off_t(const char *); 73 74 static const struct arg { 75 const char *name; 76 void (*f)(char *); 77 u_int set, noset; 78 } args[] = { 79 { "bs", f_bs, C_BS, C_BS|C_IBS|C_OBS|C_OSYNC }, 80 { "cbs", f_cbs, C_CBS, C_CBS }, 81 { "conv", f_conv, 0, 0 }, 82 { "count", f_count, C_COUNT, C_COUNT }, 83 { "files", f_files, C_FILES, C_FILES }, 84 { "ibs", f_ibs, C_IBS, C_BS|C_IBS }, 85 { "if", f_if, C_IF, C_IF }, 86 { "iseek", f_skip, C_SKIP, C_SKIP }, 87 { "obs", f_obs, C_OBS, C_BS|C_OBS }, 88 { "of", f_of, C_OF, C_OF }, 89 { "oseek", f_seek, C_SEEK, C_SEEK }, 90 { "seek", f_seek, C_SEEK, C_SEEK }, 91 { "skip", f_skip, C_SKIP, C_SKIP }, 92 }; 93 94 static char *oper; 95 96 /* 97 * args -- parse JCL syntax of dd. 98 */ 99 void 100 jcl(char **argv) 101 { 102 struct arg *ap, tmp; 103 char *arg; 104 105 in.dbsz = out.dbsz = 512; 106 107 while ((oper = *++argv) != NULL) { 108 if ((oper = strdup(oper)) == NULL) 109 errx(1, "unable to allocate space for the argument \"%s\"", *argv); 110 if ((arg = strchr(oper, '=')) == NULL) 111 errx(1, "unknown operand %s", oper); 112 *arg++ = '\0'; 113 if (!*arg) 114 errx(1, "no value specified for %s", oper); 115 tmp.name = oper; 116 if (!(ap = (struct arg *)bsearch(&tmp, args, 117 sizeof(args)/sizeof(struct arg), sizeof(struct arg), 118 c_arg))) 119 errx(1, "unknown operand %s", tmp.name); 120 if (ddflags & ap->noset) 121 errx(1, "%s: illegal argument combination or already set", 122 tmp.name); 123 ddflags |= ap->set; 124 ap->f(arg); 125 } 126 127 /* Final sanity checks. */ 128 129 if (ddflags & C_BS) { 130 /* 131 * Bs is turned off by any conversion -- we assume the user 132 * just wanted to set both the input and output block sizes 133 * and didn't want the bs semantics, so we don't warn. 134 */ 135 if (ddflags & (C_BLOCK | C_LCASE | C_SWAB | C_UCASE | 136 C_UNBLOCK)) 137 ddflags &= ~C_BS; 138 139 /* Bs supersedes ibs and obs. */ 140 if (ddflags & C_BS && ddflags & (C_IBS | C_OBS)) 141 warnx("bs supersedes ibs and obs"); 142 } 143 144 /* 145 * Ascii/ebcdic and cbs implies block/unblock. 146 * Block/unblock requires cbs and vice-versa. 147 */ 148 if (ddflags & (C_BLOCK | C_UNBLOCK)) { 149 if (!(ddflags & C_CBS)) 150 errx(1, "record operations require cbs"); 151 if (cbsz == 0) 152 errx(1, "cbs cannot be zero"); 153 cfunc = ddflags & C_BLOCK ? block : unblock; 154 } else if (ddflags & C_CBS) { 155 if (ddflags & (C_ASCII | C_EBCDIC)) { 156 if (ddflags & C_ASCII) { 157 ddflags |= C_UNBLOCK; 158 cfunc = unblock; 159 } else { 160 ddflags |= C_BLOCK; 161 cfunc = block; 162 } 163 } else 164 errx(1, "cbs meaningless if not doing record operations"); 165 } else 166 cfunc = def; 167 168 /* 169 * Bail out if the calculation of a file offset would overflow. 170 */ 171 if (in.offset > OFF_MAX / (ssize_t)in.dbsz || 172 out.offset > OFF_MAX / (ssize_t)out.dbsz) 173 errx(1, "seek offsets cannot be larger than %jd", 174 (intmax_t)OFF_MAX); 175 } 176 177 static int 178 c_arg(const void *a, const void *b) 179 { 180 181 return (strcmp(((const struct arg *)a)->name, 182 ((const struct arg *)b)->name)); 183 } 184 185 static void 186 f_bs(char *arg) 187 { 188 uintmax_t res; 189 190 res = get_num(arg); 191 if (res < 1 || res > SSIZE_MAX) 192 errx(1, "bs must be between 1 and %jd", (intmax_t)SSIZE_MAX); 193 in.dbsz = out.dbsz = (size_t)res; 194 } 195 196 static void 197 f_cbs(char *arg) 198 { 199 uintmax_t res; 200 201 res = get_num(arg); 202 if (res < 1 || res > SSIZE_MAX) 203 errx(1, "cbs must be between 1 and %jd", (intmax_t)SSIZE_MAX); 204 cbsz = (size_t)res; 205 } 206 207 static void 208 f_count(char *arg) 209 { 210 intmax_t res; 211 212 res = (intmax_t)get_num(arg); 213 if (res < 0) 214 errx(1, "count cannot be negative"); 215 if (res == 0) 216 cpy_cnt = (uintmax_t)-1; 217 else 218 cpy_cnt = (uintmax_t)res; 219 } 220 221 static void 222 f_files(char *arg) 223 { 224 225 files_cnt = get_num(arg); 226 if (files_cnt < 1) 227 errx(1, "files must be between 1 and %jd", (uintmax_t)-1); 228 } 229 230 static void 231 f_ibs(char *arg) 232 { 233 uintmax_t res; 234 235 if (!(ddflags & C_BS)) { 236 res = get_num(arg); 237 if (res < 1 || res > SSIZE_MAX) 238 errx(1, "ibs must be between 1 and %jd", 239 (intmax_t)SSIZE_MAX); 240 in.dbsz = (size_t)res; 241 } 242 } 243 244 static void 245 f_if(char *arg) 246 { 247 248 in.name = arg; 249 } 250 251 static void 252 f_obs(char *arg) 253 { 254 uintmax_t res; 255 256 if (!(ddflags & C_BS)) { 257 res = get_num(arg); 258 if (res < 1 || res > SSIZE_MAX) 259 errx(1, "obs must be between 1 and %jd", 260 (intmax_t)SSIZE_MAX); 261 out.dbsz = (size_t)res; 262 } 263 } 264 265 static void 266 f_of(char *arg) 267 { 268 269 out.name = arg; 270 } 271 272 static void 273 f_seek(char *arg) 274 { 275 276 out.offset = get_off_t(arg); 277 } 278 279 static void 280 f_skip(char *arg) 281 { 282 283 in.offset = get_off_t(arg); 284 } 285 286 static const struct conv { 287 const char *name; 288 u_int set, noset; 289 const u_char *ctab; 290 } clist[] = { 291 { "ascii", C_ASCII, C_EBCDIC, e2a_POSIX }, 292 { "block", C_BLOCK, C_UNBLOCK, NULL }, 293 { "ebcdic", C_EBCDIC, C_ASCII, a2e_POSIX }, 294 { "ibm", C_EBCDIC, C_ASCII, a2ibm_POSIX }, 295 { "lcase", C_LCASE, C_UCASE, NULL }, 296 { "noerror", C_NOERROR, 0, NULL }, 297 { "notrunc", C_NOTRUNC, 0, NULL }, 298 { "oldascii", C_ASCII, C_EBCDIC, e2a_32V }, 299 { "oldebcdic", C_EBCDIC, C_ASCII, a2e_32V }, 300 { "oldibm", C_EBCDIC, C_ASCII, a2ibm_32V }, 301 { "osync", C_OSYNC, C_BS, NULL }, 302 { "sparse", C_SPARSE, 0, NULL }, 303 { "swab", C_SWAB, 0, NULL }, 304 { "sync", C_SYNC, 0, NULL }, 305 { "ucase", C_UCASE, C_LCASE, NULL }, 306 { "unblock", C_UNBLOCK, C_BLOCK, NULL }, 307 }; 308 309 static void 310 f_conv(char *arg) 311 { 312 struct conv *cp, tmp; 313 314 while (arg != NULL) { 315 tmp.name = strsep(&arg, ","); 316 cp = bsearch(&tmp, clist, sizeof(clist) / sizeof(struct conv), 317 sizeof(struct conv), c_conv); 318 if (cp == NULL) 319 errx(1, "unknown conversion %s", tmp.name); 320 if (ddflags & cp->noset) 321 errx(1, "%s: illegal conversion combination", tmp.name); 322 ddflags |= cp->set; 323 if (cp->ctab) 324 ctab = cp->ctab; 325 } 326 } 327 328 static int 329 c_conv(const void *a, const void *b) 330 { 331 332 return (strcmp(((const struct conv *)a)->name, 333 ((const struct conv *)b)->name)); 334 } 335 336 /* 337 * Convert an expression of the following forms to a uintmax_t. 338 * 1) A positive decimal number. 339 * 2) A positive decimal number followed by a b (mult by 512). 340 * 3) A positive decimal number followed by a k (mult by 1 << 10). 341 * 4) A positive decimal number followed by a m (mult by 1 << 20). 342 * 5) A positive decimal number followed by a g (mult by 1 << 30). 343 * 5) A positive decimal number followed by a w (mult by sizeof int). 344 * 6) Two or more positive decimal numbers (with/without [bkmgw]) 345 * separated by x (also * for backwards compatibility), specifying 346 * the product of the indicated values. 347 */ 348 static uintmax_t 349 get_num(const char *val) 350 { 351 uintmax_t num, mult, prevnum; 352 char *expr; 353 354 errno = 0; 355 num = strtouq(val, &expr, 0); 356 if (errno != 0) /* Overflow or underflow. */ 357 err(1, "%s", oper); 358 359 if (expr == val) /* No valid digits. */ 360 errx(1, "%s: illegal numeric value", oper); 361 362 mult = 0; 363 switch (*expr) { 364 case 'b': 365 mult = 512; 366 break; 367 case 'k': 368 mult = 1 << 10; 369 break; 370 case 'm': 371 mult = 1 << 20; 372 break; 373 case 'g': 374 mult = 1 << 30; 375 break; 376 case 'w': 377 mult = sizeof(int); 378 break; 379 default: 380 ; 381 } 382 383 if (mult != 0) { 384 prevnum = num; 385 num *= mult; 386 /* Check for overflow. */ 387 if (num / mult != prevnum) 388 goto erange; 389 expr++; 390 } 391 392 switch (*expr) { 393 case '\0': 394 break; 395 case '*': /* Backward compatible. */ 396 case 'x': 397 mult = get_num(expr + 1); 398 prevnum = num; 399 num *= mult; 400 if (num / mult == prevnum) 401 break; 402 erange: 403 errx(1, "%s: %s", oper, strerror(ERANGE)); 404 default: 405 errx(1, "%s: illegal numeric value", oper); 406 } 407 return (num); 408 } 409 410 /* 411 * Convert an expression of the following forms to an off_t. This is the 412 * same as get_num(), but it uses signed numbers. 413 * 414 * The major problem here is that an off_t may not necessarily be a intmax_t. 415 */ 416 static off_t 417 get_off_t(const char *val) 418 { 419 intmax_t num, mult, prevnum; 420 char *expr; 421 422 errno = 0; 423 num = strtoq(val, &expr, 0); 424 if (errno != 0) /* Overflow or underflow. */ 425 err(1, "%s", oper); 426 427 if (expr == val) /* No valid digits. */ 428 errx(1, "%s: illegal numeric value", oper); 429 430 mult = 0; 431 switch (*expr) { 432 case 'b': 433 mult = 512; 434 break; 435 case 'k': 436 mult = 1 << 10; 437 break; 438 case 'm': 439 mult = 1 << 20; 440 break; 441 case 'g': 442 mult = 1 << 30; 443 break; 444 case 'w': 445 mult = sizeof(int); 446 break; 447 } 448 449 if (mult != 0) { 450 prevnum = num; 451 num *= mult; 452 /* Check for overflow. */ 453 if ((prevnum > 0) != (num > 0) || num / mult != prevnum) 454 goto erange; 455 expr++; 456 } 457 458 switch (*expr) { 459 case '\0': 460 break; 461 case '*': /* Backward compatible. */ 462 case 'x': 463 mult = (intmax_t)get_off_t(expr + 1); 464 prevnum = num; 465 num *= mult; 466 if ((prevnum > 0) == (num > 0) && num / mult == prevnum) 467 break; 468 erange: 469 errx(1, "%s: %s", oper, strerror(ERANGE)); 470 default: 471 errx(1, "%s: illegal numeric value", oper); 472 } 473 return (num); 474 } 475