args.c revision 99109
11556Srgrimes/*- 21556Srgrimes * Copyright (c) 1991, 1993, 1994 31556Srgrimes * The Regents of the University of California. All rights reserved. 41556Srgrimes * 51556Srgrimes * This code is derived from software contributed to Berkeley by 61556Srgrimes * Keith Muller of the University of California, San Diego and Lance 71556Srgrimes * Visser of Convex Computer Corporation. 81556Srgrimes * 91556Srgrimes * Redistribution and use in source and binary forms, with or without 101556Srgrimes * modification, are permitted provided that the following conditions 111556Srgrimes * are met: 121556Srgrimes * 1. Redistributions of source code must retain the above copyright 131556Srgrimes * notice, this list of conditions and the following disclaimer. 141556Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 151556Srgrimes * notice, this list of conditions and the following disclaimer in the 161556Srgrimes * documentation and/or other materials provided with the distribution. 171556Srgrimes * 3. All advertising materials mentioning features or use of this software 181556Srgrimes * must display the following acknowledgement: 191556Srgrimes * This product includes software developed by the University of 201556Srgrimes * California, Berkeley and its contributors. 211556Srgrimes * 4. Neither the name of the University nor the names of its contributors 221556Srgrimes * may be used to endorse or promote products derived from this software 231556Srgrimes * without specific prior written permission. 241556Srgrimes * 251556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 261556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 271556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 281556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 291556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 301556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 311556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 321556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 331556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 341556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 351556Srgrimes * SUCH DAMAGE. 361556Srgrimes */ 371556Srgrimes 381556Srgrimes#ifndef lint 3935773Scharnier#if 0 4036007Scharnierstatic char sccsid[] = "@(#)args.c 8.3 (Berkeley) 4/2/94"; 4135773Scharnier#endif 421556Srgrimes#endif /* not lint */ 4399109Sobrien#include <sys/cdefs.h> 4499109Sobrien__FBSDID("$FreeBSD: head/bin/dd/args.c 99109 2002-06-30 05:13:54Z obrien $"); 451556Srgrimes 461556Srgrimes#include <sys/types.h> 471556Srgrimes 481556Srgrimes#include <err.h> 491556Srgrimes#include <errno.h> 501556Srgrimes#include <limits.h> 511556Srgrimes#include <stdlib.h> 521556Srgrimes#include <string.h> 531556Srgrimes 541556Srgrimes#include "dd.h" 551556Srgrimes#include "extern.h" 561556Srgrimes 5790108Simpstatic int c_arg(const void *, const void *); 5890108Simpstatic int c_conv(const void *, const void *); 5990108Simpstatic void f_bs(char *); 6090108Simpstatic void f_cbs(char *); 6190108Simpstatic void f_conv(char *); 6290108Simpstatic void f_count(char *); 6390108Simpstatic void f_files(char *); 6490108Simpstatic void f_ibs(char *); 6590108Simpstatic void f_if(char *); 6690108Simpstatic void f_obs(char *); 6790108Simpstatic void f_of(char *); 6890108Simpstatic void f_seek(char *); 6990108Simpstatic void f_skip(char *); 7090108Simpstatic u_quad_t get_num(const char *); 7190108Simpstatic off_t get_off_t(const char *); 721556Srgrimes 7351208Sgreenstatic const struct arg { 7454245Sgreen const char *name; 7590108Simp void (*f)(char *); 761556Srgrimes u_int set, noset; 771556Srgrimes} args[] = { 781556Srgrimes { "bs", f_bs, C_BS, C_BS|C_IBS|C_OBS|C_OSYNC }, 791556Srgrimes { "cbs", f_cbs, C_CBS, C_CBS }, 801556Srgrimes { "conv", f_conv, 0, 0 }, 811556Srgrimes { "count", f_count, C_COUNT, C_COUNT }, 821556Srgrimes { "files", f_files, C_FILES, C_FILES }, 831556Srgrimes { "ibs", f_ibs, C_IBS, C_BS|C_IBS }, 841556Srgrimes { "if", f_if, C_IF, C_IF }, 8557523Sgreen { "iseek", f_skip, C_SKIP, C_SKIP }, 861556Srgrimes { "obs", f_obs, C_OBS, C_BS|C_OBS }, 871556Srgrimes { "of", f_of, C_OF, C_OF }, 8857523Sgreen { "oseek", f_seek, C_SEEK, C_SEEK }, 891556Srgrimes { "seek", f_seek, C_SEEK, C_SEEK }, 901556Srgrimes { "skip", f_skip, C_SKIP, C_SKIP }, 911556Srgrimes}; 921556Srgrimes 931556Srgrimesstatic char *oper; 941556Srgrimes 951556Srgrimes/* 961556Srgrimes * args -- parse JCL syntax of dd. 971556Srgrimes */ 981556Srgrimesvoid 9990108Simpjcl(char **argv) 1001556Srgrimes{ 1011556Srgrimes struct arg *ap, tmp; 1021556Srgrimes char *arg; 1031556Srgrimes 1041556Srgrimes in.dbsz = out.dbsz = 512; 1051556Srgrimes 10619720Sphk while ((oper = *++argv) != NULL) { 10730230Seivind if ((oper = strdup(oper)) == NULL) 10848051Sgreen errx(1, "unable to allocate space for the argument \"%s\"", *argv); 1091556Srgrimes if ((arg = strchr(oper, '=')) == NULL) 1101556Srgrimes errx(1, "unknown operand %s", oper); 1111556Srgrimes *arg++ = '\0'; 1121556Srgrimes if (!*arg) 1131556Srgrimes errx(1, "no value specified for %s", oper); 1141556Srgrimes tmp.name = oper; 11548051Sgreen if (!(ap = (struct arg *)bsearch(&tmp, args, 11648051Sgreen sizeof(args)/sizeof(struct arg), sizeof(struct arg), 11748051Sgreen c_arg))) 1181556Srgrimes errx(1, "unknown operand %s", tmp.name); 1191556Srgrimes if (ddflags & ap->noset) 12048051Sgreen errx(1, "%s: illegal argument combination or already set", 12148051Sgreen tmp.name); 1221556Srgrimes ddflags |= ap->set; 1231556Srgrimes ap->f(arg); 1241556Srgrimes } 1251556Srgrimes 1261556Srgrimes /* Final sanity checks. */ 1271556Srgrimes 1281556Srgrimes if (ddflags & C_BS) { 1291556Srgrimes /* 1301556Srgrimes * Bs is turned off by any conversion -- we assume the user 1311556Srgrimes * just wanted to set both the input and output block sizes 1321556Srgrimes * and didn't want the bs semantics, so we don't warn. 1331556Srgrimes */ 13462311Sgreen if (ddflags & (C_BLOCK | C_LCASE | C_SWAB | C_UCASE | 13562311Sgreen C_UNBLOCK)) 1361556Srgrimes ddflags &= ~C_BS; 1371556Srgrimes 1381556Srgrimes /* Bs supersedes ibs and obs. */ 13962311Sgreen if (ddflags & C_BS && ddflags & (C_IBS | C_OBS)) 1401556Srgrimes warnx("bs supersedes ibs and obs"); 1411556Srgrimes } 1421556Srgrimes 1431556Srgrimes /* 1441556Srgrimes * Ascii/ebcdic and cbs implies block/unblock. 1451556Srgrimes * Block/unblock requires cbs and vice-versa. 1461556Srgrimes */ 14751249Sgreen if (ddflags & (C_BLOCK | C_UNBLOCK)) { 1481556Srgrimes if (!(ddflags & C_CBS)) 1491556Srgrimes errx(1, "record operations require cbs"); 1501556Srgrimes if (cbsz == 0) 1511556Srgrimes errx(1, "cbs cannot be zero"); 1521556Srgrimes cfunc = ddflags & C_BLOCK ? block : unblock; 1531556Srgrimes } else if (ddflags & C_CBS) { 15451249Sgreen if (ddflags & (C_ASCII | C_EBCDIC)) { 1551556Srgrimes if (ddflags & C_ASCII) { 1561556Srgrimes ddflags |= C_UNBLOCK; 1571556Srgrimes cfunc = unblock; 1581556Srgrimes } else { 1591556Srgrimes ddflags |= C_BLOCK; 1601556Srgrimes cfunc = block; 1611556Srgrimes } 1621556Srgrimes } else 1631556Srgrimes errx(1, "cbs meaningless if not doing record operations"); 1641556Srgrimes } else 1651556Srgrimes cfunc = def; 16651249Sgreen 16751208Sgreen /* 16851208Sgreen * Bail out if the calculation of a file offset would overflow. 16951208Sgreen */ 17051208Sgreen if (in.offset > QUAD_MAX / in.dbsz || out.offset > QUAD_MAX / out.dbsz) 17151208Sgreen errx(1, "seek offsets cannot be larger than %qd", QUAD_MAX); 1721556Srgrimes} 1731556Srgrimes 1741556Srgrimesstatic int 17590108Simpc_arg(const void *a, const void *b) 1761556Srgrimes{ 1771556Srgrimes 17854278Sgreen return (strcmp(((const struct arg *)a)->name, 17954278Sgreen ((const struct arg *)b)->name)); 1801556Srgrimes} 1811556Srgrimes 1821556Srgrimesstatic void 18390108Simpf_bs(char *arg) 1841556Srgrimes{ 18589788Sgreen u_quad_t res; 1861556Srgrimes 18751208Sgreen res = get_num(arg); 18851208Sgreen if (res < 1 || res > SSIZE_MAX) 18951208Sgreen errx(1, "bs must be between 1 and %d", SSIZE_MAX); 19051208Sgreen in.dbsz = out.dbsz = (size_t)res; 1911556Srgrimes} 1921556Srgrimes 1931556Srgrimesstatic void 19490108Simpf_cbs(char *arg) 1951556Srgrimes{ 19689788Sgreen u_quad_t res; 1971556Srgrimes 19851208Sgreen res = get_num(arg); 19951208Sgreen if (res < 1 || res > SSIZE_MAX) 20051208Sgreen errx(1, "cbs must be between 1 and %d", SSIZE_MAX); 20151208Sgreen cbsz = (size_t)res; 2021556Srgrimes} 2031556Srgrimes 2041556Srgrimesstatic void 20590108Simpf_count(char *arg) 2061556Srgrimes{ 20789788Sgreen u_quad_t res; 2081556Srgrimes 20989788Sgreen res = get_num(arg); 21089788Sgreen if ((quad_t)res < 0) 21151326Sgreen errx(1, "count cannot be negative"); 21289788Sgreen if (res == 0) 21351335Sgreen cpy_cnt = -1; 21489788Sgreen else 21589788Sgreen cpy_cnt = (quad_t)res; 2161556Srgrimes} 2171556Srgrimes 2181556Srgrimesstatic void 21990108Simpf_files(char *arg) 2201556Srgrimes{ 2211556Srgrimes 22251137Sgreen files_cnt = get_num(arg); 22351249Sgreen if (files_cnt < 1) 22451249Sgreen errx(1, "files must be between 1 and %qd", QUAD_MAX); 2251556Srgrimes} 2261556Srgrimes 2271556Srgrimesstatic void 22890108Simpf_ibs(char *arg) 2291556Srgrimes{ 23089788Sgreen u_quad_t res; 2311556Srgrimes 23248051Sgreen if (!(ddflags & C_BS)) { 23351208Sgreen res = get_num(arg); 23451208Sgreen if (res < 1 || res > SSIZE_MAX) 23551249Sgreen errx(1, "ibs must be between 1 and %d", SSIZE_MAX); 23651249Sgreen in.dbsz = (size_t)res; 23748051Sgreen } 2381556Srgrimes} 2391556Srgrimes 2401556Srgrimesstatic void 24190108Simpf_if(char *arg) 2421556Srgrimes{ 2431556Srgrimes 2441556Srgrimes in.name = arg; 2451556Srgrimes} 2461556Srgrimes 2471556Srgrimesstatic void 24890108Simpf_obs(char *arg) 2491556Srgrimes{ 25089788Sgreen u_quad_t res; 2511556Srgrimes 25248051Sgreen if (!(ddflags & C_BS)) { 25351208Sgreen res = get_num(arg); 25451208Sgreen if (res < 1 || res > SSIZE_MAX) 25551208Sgreen errx(1, "obs must be between 1 and %d", SSIZE_MAX); 25651208Sgreen out.dbsz = (size_t)res; 25748051Sgreen } 2581556Srgrimes} 2591556Srgrimes 2601556Srgrimesstatic void 26190108Simpf_of(char *arg) 2621556Srgrimes{ 2631556Srgrimes 2641556Srgrimes out.name = arg; 2651556Srgrimes} 2661556Srgrimes 2671556Srgrimesstatic void 26890108Simpf_seek(char *arg) 2691556Srgrimes{ 2701556Srgrimes 27189788Sgreen out.offset = get_off_t(arg); 2721556Srgrimes} 2731556Srgrimes 2741556Srgrimesstatic void 27590108Simpf_skip(char *arg) 2761556Srgrimes{ 2771556Srgrimes 27889788Sgreen in.offset = get_off_t(arg); 2791556Srgrimes} 2801556Srgrimes 28151208Sgreenstatic const struct conv { 28254245Sgreen const char *name; 2831556Srgrimes u_int set, noset; 28451208Sgreen const u_char *ctab; 2851556Srgrimes} clist[] = { 2861556Srgrimes { "ascii", C_ASCII, C_EBCDIC, e2a_POSIX }, 2871556Srgrimes { "block", C_BLOCK, C_UNBLOCK, NULL }, 2881556Srgrimes { "ebcdic", C_EBCDIC, C_ASCII, a2e_POSIX }, 2891556Srgrimes { "ibm", C_EBCDIC, C_ASCII, a2ibm_POSIX }, 2901556Srgrimes { "lcase", C_LCASE, C_UCASE, NULL }, 2911556Srgrimes { "noerror", C_NOERROR, 0, NULL }, 2921556Srgrimes { "notrunc", C_NOTRUNC, 0, NULL }, 2931556Srgrimes { "oldascii", C_ASCII, C_EBCDIC, e2a_32V }, 2941556Srgrimes { "oldebcdic", C_EBCDIC, C_ASCII, a2e_32V }, 2951556Srgrimes { "oldibm", C_EBCDIC, C_ASCII, a2ibm_32V }, 29631120Sjoerg { "osync", C_OSYNC, C_BS, NULL }, 29730312Sjoerg { "sparse", C_SPARSE, 0, NULL }, 2981556Srgrimes { "swab", C_SWAB, 0, NULL }, 2991556Srgrimes { "sync", C_SYNC, 0, NULL }, 3001556Srgrimes { "ucase", C_UCASE, C_LCASE, NULL }, 3011556Srgrimes { "unblock", C_UNBLOCK, C_BLOCK, NULL }, 3021556Srgrimes}; 3031556Srgrimes 3041556Srgrimesstatic void 30590108Simpf_conv(char *arg) 3061556Srgrimes{ 3071556Srgrimes struct conv *cp, tmp; 3081556Srgrimes 3091556Srgrimes while (arg != NULL) { 3101556Srgrimes tmp.name = strsep(&arg, ","); 31151208Sgreen cp = bsearch(&tmp, clist, sizeof(clist) / sizeof(struct conv), 31251208Sgreen sizeof(struct conv), c_conv); 31351208Sgreen if (cp == NULL) 3141556Srgrimes errx(1, "unknown conversion %s", tmp.name); 3151556Srgrimes if (ddflags & cp->noset) 3161556Srgrimes errx(1, "%s: illegal conversion combination", tmp.name); 3171556Srgrimes ddflags |= cp->set; 3181556Srgrimes if (cp->ctab) 3191556Srgrimes ctab = cp->ctab; 3201556Srgrimes } 3211556Srgrimes} 3221556Srgrimes 3231556Srgrimesstatic int 32490108Simpc_conv(const void *a, const void *b) 3251556Srgrimes{ 3261556Srgrimes 32754278Sgreen return (strcmp(((const struct conv *)a)->name, 32854278Sgreen ((const struct conv *)b)->name)); 3291556Srgrimes} 3301556Srgrimes 3311556Srgrimes/* 33289788Sgreen * Convert an expression of the following forms to a u_quad_t. 3331556Srgrimes * 1) A positive decimal number. 33489788Sgreen * 2) A positive decimal number followed by a b (mult by 512). 33589788Sgreen * 3) A positive decimal number followed by a k (mult by 1 << 10). 33689788Sgreen * 4) A positive decimal number followed by a m (mult by 1 << 20). 33789788Sgreen * 5) A positive decimal number followed by a g (mult by 1 << 30). 33889788Sgreen * 5) A positive decimal number followed by a w (mult by sizeof int). 33948051Sgreen * 6) Two or more positive decimal numbers (with/without [bkmgw]) 34046684Skris * separated by x (also * for backwards compatibility), specifying 3411556Srgrimes * the product of the indicated values. 3421556Srgrimes */ 34389788Sgreenstatic u_quad_t 34490108Simpget_num(const char *val) 3451556Srgrimes{ 34689788Sgreen u_quad_t num, mult, prevnum; 3471556Srgrimes char *expr; 3481556Srgrimes 34948051Sgreen errno = 0; 35089788Sgreen num = strtouq(val, &expr, 0); 35151208Sgreen if (errno != 0) /* Overflow or underflow. */ 35248051Sgreen err(1, "%s", oper); 35348051Sgreen 35451208Sgreen if (expr == val) /* No valid digits. */ 3551556Srgrimes errx(1, "%s: illegal numeric value", oper); 3561556Srgrimes 35789788Sgreen mult = 0; 35851137Sgreen switch (*expr) { 3591556Srgrimes case 'b': 36089788Sgreen mult = 512; 3611556Srgrimes break; 3621556Srgrimes case 'k': 36389788Sgreen mult = 1 << 10; 3641556Srgrimes break; 3651556Srgrimes case 'm': 36689788Sgreen mult = 1 << 20; 3671556Srgrimes break; 36848051Sgreen case 'g': 36989788Sgreen mult = 1 << 30; 37048051Sgreen break; 3711556Srgrimes case 'w': 37289788Sgreen mult = sizeof(int); 3731556Srgrimes break; 37491079Smarkm default: 37596383Sjedgar ; 3761556Srgrimes } 3771556Srgrimes 37889788Sgreen if (mult != 0) { 37989788Sgreen prevnum = num; 38089788Sgreen num *= mult; 38189788Sgreen /* Check for overflow. */ 38289788Sgreen if (num / mult != prevnum) 38389788Sgreen goto erange; 38489788Sgreen expr++; 38589788Sgreen } 38689788Sgreen 38751137Sgreen switch (*expr) { 3881556Srgrimes case '\0': 3891556Srgrimes break; 3901556Srgrimes case '*': /* Backward compatible. */ 3911556Srgrimes case 'x': 39289788Sgreen mult = get_num(expr + 1); 39389788Sgreen prevnum = num; 39489788Sgreen num *= mult; 39589788Sgreen if (num / mult == prevnum) 39651137Sgreen break; 39751137Sgreenerange: 39851137Sgreen errx(1, "%s: %s", oper, strerror(ERANGE)); 3991556Srgrimes default: 4001556Srgrimes errx(1, "%s: illegal numeric value", oper); 4011556Srgrimes } 4021556Srgrimes return (num); 4031556Srgrimes} 40451208Sgreen 40589788Sgreen/* 40689788Sgreen * Convert an expression of the following forms to an off_t. This is the 40789788Sgreen * same as get_num(), but it uses signed numbers. 40889788Sgreen * 40989788Sgreen * The major problem here is that an off_t may not necessarily be a quad_t. 41089788Sgreen * The right thing to do would be to use intmax_t when available and then 41189788Sgreen * cast down to an off_t, if possible. 41289788Sgreen */ 41351208Sgreenstatic off_t 41490108Simpget_off_t(const char *val) 41551208Sgreen{ 41689788Sgreen quad_t num, mult, prevnum; 41789788Sgreen char *expr; 41851208Sgreen 41989788Sgreen errno = 0; 42089788Sgreen num = strtoq(val, &expr, 0); 42189788Sgreen if (errno != 0) /* Overflow or underflow. */ 42289788Sgreen err(1, "%s", oper); 42389788Sgreen 42489788Sgreen if (expr == val) /* No valid digits. */ 42589788Sgreen errx(1, "%s: illegal numeric value", oper); 42689788Sgreen 42789788Sgreen mult = 0; 42889788Sgreen switch (*expr) { 42989788Sgreen case 'b': 43089788Sgreen mult = 512; 43189788Sgreen break; 43289788Sgreen case 'k': 43389788Sgreen mult = 1 << 10; 43489788Sgreen break; 43589788Sgreen case 'm': 43689788Sgreen mult = 1 << 20; 43789788Sgreen break; 43889788Sgreen case 'g': 43989788Sgreen mult = 1 << 30; 44089788Sgreen break; 44189788Sgreen case 'w': 44289788Sgreen mult = sizeof(int); 44389788Sgreen break; 44489788Sgreen } 44589788Sgreen 44689788Sgreen if (mult != 0) { 44789788Sgreen prevnum = num; 44889788Sgreen num *= mult; 44989788Sgreen /* Check for overflow. */ 45089788Sgreen if ((prevnum > 0) != (num > 0) || num / mult != prevnum) 45189788Sgreen goto erange; 45289788Sgreen expr++; 45389788Sgreen } 45489788Sgreen 45589788Sgreen switch (*expr) { 45689788Sgreen case '\0': 45789788Sgreen break; 45889788Sgreen case '*': /* Backward compatible. */ 45989788Sgreen case 'x': 46089788Sgreen mult = (quad_t)get_off_t(expr + 1); 46189788Sgreen prevnum = num; 46289788Sgreen num *= mult; 46390331Sgreen if ((prevnum > 0) == (num > 0) && num / mult == prevnum) 46489788Sgreen break; 46589788Sgreenerange: 46689788Sgreen errx(1, "%s: %s", oper, strerror(ERANGE)); 46789788Sgreen default: 46889788Sgreen errx(1, "%s: illegal numeric value", oper); 46989788Sgreen } 47089788Sgreen return (num); 47151208Sgreen} 472