args.c revision 51137
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 40static char sccsid[] = "@(#)args.c 8.3 (Berkeley) 4/2/94"; 41#endif 42static const char rcsid[] = 43 "$FreeBSD: head/bin/dd/args.c 51137 1999-09-11 00:02:42Z green $"; 44#endif /* not lint */ 45 46#include <sys/types.h> 47 48#include <err.h> 49#include <errno.h> 50#include <limits.h> 51#include <stdlib.h> 52#include <string.h> 53 54#include "dd.h" 55#include "extern.h" 56 57static int c_arg __P((const void *, const void *)); 58static int c_conv __P((const void *, const void *)); 59static void f_bs __P((char *)); 60static void f_cbs __P((char *)); 61static void f_conv __P((char *)); 62static void f_count __P((char *)); 63static void f_files __P((char *)); 64static void f_ibs __P((char *)); 65static void f_if __P((char *)); 66static void f_obs __P((char *)); 67static void f_of __P((char *)); 68static void f_seek __P((char *)); 69static void f_skip __P((char *)); 70static quad_t get_num __P((char *)); 71 72static struct arg { 73 char *name; 74 void (*f) __P((char *)); 75 u_int set, noset; 76} args[] = { 77 { "bs", f_bs, C_BS, C_BS|C_IBS|C_OBS|C_OSYNC }, 78 { "cbs", f_cbs, C_CBS, C_CBS }, 79 { "conv", f_conv, 0, 0 }, 80 { "count", f_count, C_COUNT, C_COUNT }, 81 { "files", f_files, C_FILES, C_FILES }, 82 { "ibs", f_ibs, C_IBS, C_BS|C_IBS }, 83 { "if", f_if, C_IF, C_IF }, 84 { "obs", f_obs, C_OBS, C_BS|C_OBS }, 85 { "of", f_of, C_OF, C_OF }, 86 { "seek", f_seek, C_SEEK, C_SEEK }, 87 { "skip", f_skip, C_SKIP, C_SKIP }, 88}; 89 90static char *oper; 91 92/* 93 * args -- parse JCL syntax of dd. 94 */ 95void 96jcl(argv) 97 char **argv; 98{ 99 struct arg *ap, tmp; 100 char *arg; 101 102 in.dbsz = out.dbsz = 512; 103 104 while ((oper = *++argv) != NULL) { 105 if ((oper = strdup(oper)) == NULL) 106 errx(1, "unable to allocate space for the argument \"%s\"", *argv); 107 if ((arg = strchr(oper, '=')) == NULL) 108 errx(1, "unknown operand %s", oper); 109 *arg++ = '\0'; 110 if (!*arg) 111 errx(1, "no value specified for %s", oper); 112 tmp.name = oper; 113 if (!(ap = (struct arg *)bsearch(&tmp, args, 114 sizeof(args)/sizeof(struct arg), sizeof(struct arg), 115 c_arg))) 116 errx(1, "unknown operand %s", tmp.name); 117 if (ddflags & ap->noset) 118 errx(1, "%s: illegal argument combination or already set", 119 tmp.name); 120 ddflags |= ap->set; 121 ap->f(arg); 122 } 123 124 /* Final sanity checks. */ 125 126 if (ddflags & C_BS) { 127 /* 128 * Bs is turned off by any conversion -- we assume the user 129 * just wanted to set both the input and output block sizes 130 * and didn't want the bs semantics, so we don't warn. 131 */ 132 if (ddflags & (C_BLOCK|C_LCASE|C_SWAB|C_UCASE|C_UNBLOCK)) 133 ddflags &= ~C_BS; 134 135 /* Bs supersedes ibs and obs. */ 136 if (ddflags & C_BS && ddflags & (C_IBS|C_OBS)) 137 warnx("bs supersedes ibs and obs"); 138 } 139 140 /* 141 * Ascii/ebcdic and cbs implies block/unblock. 142 * Block/unblock requires cbs and vice-versa. 143 */ 144 if (ddflags & (C_BLOCK|C_UNBLOCK)) { 145 if (!(ddflags & C_CBS)) 146 errx(1, "record operations require cbs"); 147 if (cbsz == 0) 148 errx(1, "cbs cannot be zero"); 149 cfunc = ddflags & C_BLOCK ? block : unblock; 150 } else if (ddflags & C_CBS) { 151 if (ddflags & (C_ASCII|C_EBCDIC)) { 152 if (ddflags & C_ASCII) { 153 ddflags |= C_UNBLOCK; 154 cfunc = unblock; 155 } else { 156 ddflags |= C_BLOCK; 157 cfunc = block; 158 } 159 } else 160 errx(1, "cbs meaningless if not doing record operations"); 161 } else 162 cfunc = def; 163} 164 165static int 166c_arg(a, b) 167 const void *a, *b; 168{ 169 170 return (strcmp(((struct arg *)a)->name, ((struct arg *)b)->name)); 171} 172 173static void 174f_bs(arg) 175 char *arg; 176{ 177 quad_t res = get_num(arg); 178 179 if (res < 1 || res > INT_MAX) 180 errx(1, "bs must be between 1 and %d", INT_MAX); 181 in.dbsz = out.dbsz = (int)res; 182} 183 184static void 185f_cbs(arg) 186 char *arg; 187{ 188 quad_t res = get_num(arg); 189 190 if (res < 1 || res > INT_MAX) 191 errx(1, "cbs must be between 1 and %d", INT_MAX); 192 cbsz = (int)res; 193} 194 195static void 196f_count(arg) 197 char *arg; 198{ 199 200 cpy_cnt = get_num(arg); 201 202 if (!cpy_cnt) 203 terminate(0); 204 if (cpy_cnt < 0) 205 errx(1, "count cannot be negative"); 206} 207 208static void 209f_files(arg) 210 char *arg; 211{ 212 213 files_cnt = get_num(arg); 214 if (files_cnt < 0) 215 errx(1, "files cannot be negative"); 216} 217 218static void 219f_ibs(arg) 220 char *arg; 221{ 222 223 if (!(ddflags & C_BS)) { 224 quad_t res = get_num(arg); 225 226 if (res < 1 || res > INT_MAX) 227 errx(1, "ibs must be between 1 and %d", INT_MAX); 228 in.dbsz = (int)res; 229 } 230} 231 232static void 233f_if(arg) 234 char *arg; 235{ 236 237 in.name = arg; 238} 239 240static void 241f_obs(arg) 242 char *arg; 243{ 244 245 if (!(ddflags & C_BS)) { 246 quad_t res = get_num(arg); 247 248 if (res < 1 || res > INT_MAX) 249 errx(1, "ibs must be between 1 and %d", INT_MAX); 250 out.dbsz = (int)res; 251 } 252} 253 254static void 255f_of(arg) 256 char *arg; 257{ 258 259 out.name = arg; 260} 261 262static void 263f_seek(arg) 264 char *arg; 265{ 266 267 out.offset = get_num(arg); 268} 269 270static void 271f_skip(arg) 272 char *arg; 273{ 274 275 in.offset = get_num(arg); 276} 277 278static struct conv { 279 char *name; 280 u_int set, noset; 281 u_char *ctab; 282} clist[] = { 283 { "ascii", C_ASCII, C_EBCDIC, e2a_POSIX }, 284 { "block", C_BLOCK, C_UNBLOCK, NULL }, 285 { "ebcdic", C_EBCDIC, C_ASCII, a2e_POSIX }, 286 { "ibm", C_EBCDIC, C_ASCII, a2ibm_POSIX }, 287 { "lcase", C_LCASE, C_UCASE, NULL }, 288 { "noerror", C_NOERROR, 0, NULL }, 289 { "notrunc", C_NOTRUNC, 0, NULL }, 290 { "oldascii", C_ASCII, C_EBCDIC, e2a_32V }, 291 { "oldebcdic", C_EBCDIC, C_ASCII, a2e_32V }, 292 { "oldibm", C_EBCDIC, C_ASCII, a2ibm_32V }, 293 { "osync", C_OSYNC, C_BS, NULL }, 294 { "sparse", C_SPARSE, 0, NULL }, 295 { "swab", C_SWAB, 0, NULL }, 296 { "sync", C_SYNC, 0, NULL }, 297 { "ucase", C_UCASE, C_LCASE, NULL }, 298 { "unblock", C_UNBLOCK, C_BLOCK, NULL }, 299}; 300 301static void 302f_conv(arg) 303 char *arg; 304{ 305 struct conv *cp, tmp; 306 307 while (arg != NULL) { 308 tmp.name = strsep(&arg, ","); 309 if (!(cp = (struct conv *)bsearch(&tmp, clist, 310 sizeof(clist)/sizeof(struct conv), sizeof(struct conv), 311 c_conv))) 312 errx(1, "unknown conversion %s", tmp.name); 313 if (ddflags & cp->noset) 314 errx(1, "%s: illegal conversion combination", tmp.name); 315 ddflags |= cp->set; 316 if (cp->ctab) 317 ctab = cp->ctab; 318 } 319} 320 321static int 322c_conv(a, b) 323 const void *a, *b; 324{ 325 326 return (strcmp(((struct conv *)a)->name, ((struct conv *)b)->name)); 327} 328 329/* 330 * Convert an expression of the following forms to a quad_t. 331 * 1) A positive decimal number. 332 * 2) A positive decimal number followed by a b (mult by 512.) 333 * 3) A positive decimal number followed by a k (mult by 1 << 10.) 334 * 4) A positive decimal number followed by a m (mult by 1 << 20.) 335 * 5) A positive decimal number followed by a g (mult by 1 << 30.) 336 * 5) A positive decimal number followed by a w (mult by sizeof int.) 337 * 6) Two or more positive decimal numbers (with/without [bkmgw]) 338 * separated by x (also * for backwards compatibility), specifying 339 * the product of the indicated values. 340 */ 341static quad_t 342get_num(val) 343 char *val; 344{ 345 quad_t num, t; 346 char *expr; 347 348 errno = 0; 349 num = strtoq(val, &expr, 0); 350 if (errno) /* Overflow or underflow. */ 351 err(1, "%s", oper); 352 353 if (expr == val) /* Not a valid number */ 354 errx(1, "%s: illegal numeric value", oper); 355 356 switch (*expr) { 357 case 'b': 358 t = num; 359 num *= 512; 360 if (t > num) 361 goto erange; 362 ++expr; 363 break; 364 case 'k': 365 t = num; 366 num *= 1 << 10; 367 if (t > num) 368 goto erange; 369 ++expr; 370 break; 371 case 'm': 372 t = num; 373 num *= 1 << 20; 374 if (t > num) 375 goto erange; 376 ++expr; 377 break; 378 case 'g': 379 t = num; 380 num *= 1 << 30; 381 if (t > num) 382 goto erange; 383 ++expr; 384 break; 385 case 'w': 386 t = num; 387 num *= sizeof(int); 388 if (t > num) 389 goto erange; 390 ++expr; 391 break; 392 } 393 394 switch (*expr) { 395 case '\0': 396 break; 397 case '*': /* Backward compatible. */ 398 case 'x': 399 t = num; 400 num *= get_num(expr + 1); 401 if (t <= num) 402 break; 403erange: 404 errx(1, "%s: %s", oper, strerror(ERANGE)); 405 default: 406 errx(1, "%s: illegal numeric value", oper); 407 } 408 return (num); 409} 410