args.c revision 19720
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 * $Id: args.c,v 1.4 1996/11/12 23:08:58 phk Exp $ 38 */ 39 40#ifndef lint 41static char sccsid[] = "@(#)args.c 8.3 (Berkeley) 4/2/94"; 42#endif /* not lint */ 43 44#include <sys/types.h> 45 46#include <err.h> 47#include <errno.h> 48#include <limits.h> 49#include <stdio.h> 50#include <stdlib.h> 51#include <string.h> 52 53#include "dd.h" 54#include "extern.h" 55 56static int c_arg __P((const void *, const void *)); 57static int c_conv __P((const void *, const void *)); 58static void f_bs __P((char *)); 59static void f_cbs __P((char *)); 60static void f_conv __P((char *)); 61static void f_count __P((char *)); 62static void f_files __P((char *)); 63static void f_ibs __P((char *)); 64static void f_if __P((char *)); 65static void f_obs __P((char *)); 66static void f_of __P((char *)); 67static void f_seek __P((char *)); 68static void f_skip __P((char *)); 69static u_long get_bsz __P((char *)); 70 71static struct arg { 72 char *name; 73 void (*f) __P((char *)); 74 u_int set, noset; 75} args[] = { 76 { "bs", f_bs, C_BS, C_BS|C_IBS|C_OBS|C_OSYNC }, 77 { "cbs", f_cbs, C_CBS, C_CBS }, 78 { "conv", f_conv, 0, 0 }, 79 { "count", f_count, C_COUNT, C_COUNT }, 80 { "files", f_files, C_FILES, C_FILES }, 81 { "ibs", f_ibs, C_IBS, C_BS|C_IBS }, 82 { "if", f_if, C_IF, C_IF }, 83 { "obs", f_obs, C_OBS, C_BS|C_OBS }, 84 { "of", f_of, C_OF, C_OF }, 85 { "seek", f_seek, C_SEEK, C_SEEK }, 86 { "skip", f_skip, C_SKIP, C_SKIP }, 87}; 88 89static char *oper; 90 91/* 92 * args -- parse JCL syntax of dd. 93 */ 94void 95jcl(argv) 96 char **argv; 97{ 98 struct arg *ap, tmp; 99 char *arg; 100 101 in.dbsz = out.dbsz = 512; 102 103 while ((oper = *++argv) != NULL) { 104 if ((arg = strchr(oper, '=')) == NULL) 105 errx(1, "unknown operand %s", oper); 106 *arg++ = '\0'; 107 if (!*arg) 108 errx(1, "no value specified for %s", oper); 109 tmp.name = oper; 110 if (!(ap = (struct arg *)bsearch(&tmp, args, 111 sizeof(args)/sizeof(struct arg), sizeof(struct arg), 112 c_arg))) 113 errx(1, "unknown operand %s", tmp.name); 114 if (ddflags & ap->noset) 115 errx(1, "%s: illegal argument combination or already set", 116 tmp.name); 117 ddflags |= ap->set; 118 ap->f(arg); 119 } 120 121 /* Final sanity checks. */ 122 123 if (ddflags & C_BS) { 124 /* 125 * Bs is turned off by any conversion -- we assume the user 126 * just wanted to set both the input and output block sizes 127 * and didn't want the bs semantics, so we don't warn. 128 */ 129 if (ddflags & (C_BLOCK|C_LCASE|C_SWAB|C_UCASE|C_UNBLOCK)) 130 ddflags &= ~C_BS; 131 132 /* Bs supersedes ibs and obs. */ 133 if (ddflags & C_BS && ddflags & (C_IBS|C_OBS)) 134 warnx("bs supersedes ibs and obs"); 135 } 136 137 /* 138 * Ascii/ebcdic and cbs implies block/unblock. 139 * Block/unblock requires cbs and vice-versa. 140 */ 141 if (ddflags & (C_BLOCK|C_UNBLOCK)) { 142 if (!(ddflags & C_CBS)) 143 errx(1, "record operations require cbs"); 144 if (cbsz == 0) 145 errx(1, "cbs cannot be zero"); 146 cfunc = ddflags & C_BLOCK ? block : unblock; 147 } else if (ddflags & C_CBS) { 148 if (ddflags & (C_ASCII|C_EBCDIC)) { 149 if (ddflags & C_ASCII) { 150 ddflags |= C_UNBLOCK; 151 cfunc = unblock; 152 } else { 153 ddflags |= C_BLOCK; 154 cfunc = block; 155 } 156 } else 157 errx(1, "cbs meaningless if not doing record operations"); 158 if (cbsz == 0) 159 errx(1, "cbs cannot be zero"); 160 } else 161 cfunc = def; 162 163 if (in.dbsz == 0 || out.dbsz == 0) 164 errx(1, "buffer sizes cannot be zero"); 165 166 /* 167 * Read, write and seek calls take ints as arguments. Seek sizes 168 * could be larger if we wanted to do it in stages or check only 169 * regular files, but it's probably not worth it. 170 */ 171 if (in.dbsz > INT_MAX || out.dbsz > INT_MAX) 172 errx(1, "buffer sizes cannot be greater than %d", INT_MAX); 173 if (in.offset > INT_MAX / in.dbsz || out.offset > INT_MAX / out.dbsz) 174 errx(1, "seek offsets cannot be larger than %d", INT_MAX); 175} 176 177static int 178c_arg(a, b) 179 const void *a, *b; 180{ 181 182 return (strcmp(((struct arg *)a)->name, ((struct arg *)b)->name)); 183} 184 185static void 186f_bs(arg) 187 char *arg; 188{ 189 190 in.dbsz = out.dbsz = (int)get_bsz(arg); 191} 192 193static void 194f_cbs(arg) 195 char *arg; 196{ 197 198 cbsz = (int)get_bsz(arg); 199} 200 201static void 202f_count(arg) 203 char *arg; 204{ 205 206 cpy_cnt = (u_int)get_bsz(arg); 207 if (!cpy_cnt) 208 terminate(0); 209} 210 211static void 212f_files(arg) 213 char *arg; 214{ 215 216 files_cnt = (int)get_bsz(arg); 217} 218 219static void 220f_ibs(arg) 221 char *arg; 222{ 223 224 if (!(ddflags & C_BS)) 225 in.dbsz = (int)get_bsz(arg); 226} 227 228static void 229f_if(arg) 230 char *arg; 231{ 232 233 in.name = arg; 234} 235 236static void 237f_obs(arg) 238 char *arg; 239{ 240 241 if (!(ddflags & C_BS)) 242 out.dbsz = (int)get_bsz(arg); 243} 244 245static void 246f_of(arg) 247 char *arg; 248{ 249 250 out.name = arg; 251} 252 253static void 254f_seek(arg) 255 char *arg; 256{ 257 258 out.offset = (u_int)get_bsz(arg); 259} 260 261static void 262f_skip(arg) 263 char *arg; 264{ 265 266 in.offset = (u_int)get_bsz(arg); 267} 268 269static struct conv { 270 char *name; 271 u_int set, noset; 272 u_char *ctab; 273} clist[] = { 274 { "ascii", C_ASCII, C_EBCDIC, e2a_POSIX }, 275 { "block", C_BLOCK, C_UNBLOCK, NULL }, 276 { "ebcdic", C_EBCDIC, C_ASCII, a2e_POSIX }, 277 { "ibm", C_EBCDIC, C_ASCII, a2ibm_POSIX }, 278 { "lcase", C_LCASE, C_UCASE, NULL }, 279 { "noerror", C_NOERROR, 0, NULL }, 280 { "notrunc", C_NOTRUNC, 0, NULL }, 281 { "oldascii", C_ASCII, C_EBCDIC, e2a_32V }, 282 { "oldebcdic", C_EBCDIC, C_ASCII, a2e_32V }, 283 { "oldibm", C_EBCDIC, C_ASCII, a2ibm_32V }, 284 { "osync", C_OSYNC, C_BS, NULL }, 285 { "swab", C_SWAB, 0, NULL }, 286 { "sync", C_SYNC, 0, NULL }, 287 { "ucase", C_UCASE, C_LCASE, NULL }, 288 { "unblock", C_UNBLOCK, C_BLOCK, NULL }, 289}; 290 291static void 292f_conv(arg) 293 char *arg; 294{ 295 struct conv *cp, tmp; 296 297 while (arg != NULL) { 298 tmp.name = strsep(&arg, ","); 299 if (!(cp = (struct conv *)bsearch(&tmp, clist, 300 sizeof(clist)/sizeof(struct conv), sizeof(struct conv), 301 c_conv))) 302 errx(1, "unknown conversion %s", tmp.name); 303 if (ddflags & cp->noset) 304 errx(1, "%s: illegal conversion combination", tmp.name); 305 ddflags |= cp->set; 306 if (cp->ctab) 307 ctab = cp->ctab; 308 } 309} 310 311static int 312c_conv(a, b) 313 const void *a, *b; 314{ 315 316 return (strcmp(((struct conv *)a)->name, ((struct conv *)b)->name)); 317} 318 319/* 320 * Convert an expression of the following forms to an unsigned long. 321 * 1) A positive decimal number. 322 * 2) A positive decimal number followed by a b (mult by 512). 323 * 3) A positive decimal number followed by a k (mult by 1024). 324 * 4) A positive decimal number followed by a m (mult by 512). 325 * 5) A positive decimal number followed by a w (mult by sizeof int) 326 * 6) Two or more positive decimal numbers (with/without k,b or w). 327 * seperated by x (also * for backwards compatibility), specifying 328 * the product of the indicated values. 329 */ 330static u_long 331get_bsz(val) 332 char *val; 333{ 334 u_long num, t; 335 char *expr; 336 337 num = strtoul(val, &expr, 0); 338 if (num == ULONG_MAX) /* Overflow. */ 339 err(1, "%s", oper); 340 if (expr == val) /* No digits. */ 341 errx(1, "%s: illegal numeric value", oper); 342 343 switch(*expr) { 344 case 'b': 345 t = num; 346 num *= 512; 347 if (t > num) 348 goto erange; 349 ++expr; 350 break; 351 case 'k': 352 t = num; 353 num *= 1024; 354 if (t > num) 355 goto erange; 356 ++expr; 357 break; 358 case 'm': 359 t = num; 360 num *= 1048576; 361 if (t > num) 362 goto erange; 363 ++expr; 364 break; 365 case 'w': 366 t = num; 367 num *= sizeof(int); 368 if (t > num) 369 goto erange; 370 ++expr; 371 break; 372 } 373 374 switch(*expr) { 375 case '\0': 376 break; 377 case '*': /* Backward compatible. */ 378 case 'x': 379 t = num; 380 num *= get_bsz(expr + 1); 381 if (t > num) 382erange: errx(1, "%s: %s", oper, strerror(ERANGE)); 383 break; 384 default: 385 errx(1, "%s: illegal numeric value", oper); 386 } 387 return (num); 388} 389