e3edab4a91
to specify an alternative padding character when using a conversion mode, or when using noerror with sync and an input error occurs. This facilities reading old and error-prone media by allowing the user to more effectively mark error blocks in the output stream.
499 lines
12 KiB
C
499 lines
12 KiB
C
/*-
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* Copyright (c) 1991, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Keith Muller of the University of California, San Diego and Lance
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* Visser of Convex Computer Corporation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)args.c 8.3 (Berkeley) 4/2/94";
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#endif
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#endif /* not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <err.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <string.h>
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#include "dd.h"
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#include "extern.h"
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static int c_arg(const void *, const void *);
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static int c_conv(const void *, const void *);
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static void f_bs(char *);
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static void f_cbs(char *);
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static void f_conv(char *);
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static void f_count(char *);
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static void f_files(char *);
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static void f_fillchar(char *);
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static void f_ibs(char *);
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static void f_if(char *);
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static void f_obs(char *);
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static void f_of(char *);
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static void f_seek(char *);
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static void f_skip(char *);
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static uintmax_t get_num(const char *);
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static off_t get_off_t(const char *);
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static const struct arg {
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const char *name;
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void (*f)(char *);
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u_int set, noset;
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} args[] = {
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{ "bs", f_bs, C_BS, C_BS|C_IBS|C_OBS|C_OSYNC },
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{ "cbs", f_cbs, C_CBS, C_CBS },
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{ "conv", f_conv, 0, 0 },
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{ "count", f_count, C_COUNT, C_COUNT },
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{ "files", f_files, C_FILES, C_FILES },
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{ "fillchar", f_fillchar, C_FILL, C_FILL },
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{ "ibs", f_ibs, C_IBS, C_BS|C_IBS },
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{ "if", f_if, C_IF, C_IF },
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{ "iseek", f_skip, C_SKIP, C_SKIP },
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{ "obs", f_obs, C_OBS, C_BS|C_OBS },
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{ "of", f_of, C_OF, C_OF },
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{ "oseek", f_seek, C_SEEK, C_SEEK },
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{ "seek", f_seek, C_SEEK, C_SEEK },
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{ "skip", f_skip, C_SKIP, C_SKIP },
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};
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static char *oper;
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/*
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* args -- parse JCL syntax of dd.
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*/
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void
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jcl(char **argv)
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{
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struct arg *ap, tmp;
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char *arg;
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in.dbsz = out.dbsz = 512;
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while ((oper = *++argv) != NULL) {
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if ((oper = strdup(oper)) == NULL)
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errx(1, "unable to allocate space for the argument \"%s\"", *argv);
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if ((arg = strchr(oper, '=')) == NULL)
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errx(1, "unknown operand %s", oper);
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*arg++ = '\0';
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if (!*arg)
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errx(1, "no value specified for %s", oper);
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tmp.name = oper;
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if (!(ap = (struct arg *)bsearch(&tmp, args,
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sizeof(args)/sizeof(struct arg), sizeof(struct arg),
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c_arg)))
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errx(1, "unknown operand %s", tmp.name);
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if (ddflags & ap->noset)
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errx(1, "%s: illegal argument combination or already set",
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tmp.name);
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ddflags |= ap->set;
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ap->f(arg);
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}
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/* Final sanity checks. */
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if (ddflags & C_BS) {
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/*
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* Bs is turned off by any conversion -- we assume the user
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* just wanted to set both the input and output block sizes
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* and didn't want the bs semantics, so we don't warn.
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*/
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if (ddflags & (C_BLOCK | C_LCASE | C_SWAB | C_UCASE |
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C_UNBLOCK))
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ddflags &= ~C_BS;
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/* Bs supersedes ibs and obs. */
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if (ddflags & C_BS && ddflags & (C_IBS | C_OBS))
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warnx("bs supersedes ibs and obs");
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}
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/*
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* Ascii/ebcdic and cbs implies block/unblock.
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* Block/unblock requires cbs and vice-versa.
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*/
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if (ddflags & (C_BLOCK | C_UNBLOCK)) {
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if (!(ddflags & C_CBS))
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errx(1, "record operations require cbs");
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if (cbsz == 0)
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errx(1, "cbs cannot be zero");
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cfunc = ddflags & C_BLOCK ? block : unblock;
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} else if (ddflags & C_CBS) {
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if (ddflags & (C_ASCII | C_EBCDIC)) {
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if (ddflags & C_ASCII) {
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ddflags |= C_UNBLOCK;
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cfunc = unblock;
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} else {
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ddflags |= C_BLOCK;
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cfunc = block;
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}
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} else
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errx(1, "cbs meaningless if not doing record operations");
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} else
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cfunc = def;
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/*
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* Bail out if the calculation of a file offset would overflow.
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*/
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if (in.offset > OFF_MAX / (ssize_t)in.dbsz ||
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out.offset > OFF_MAX / (ssize_t)out.dbsz)
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errx(1, "seek offsets cannot be larger than %jd",
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(intmax_t)OFF_MAX);
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}
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static int
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c_arg(const void *a, const void *b)
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{
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return (strcmp(((const struct arg *)a)->name,
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((const struct arg *)b)->name));
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}
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static void
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f_bs(char *arg)
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{
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uintmax_t res;
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res = get_num(arg);
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if (res < 1 || res > SSIZE_MAX)
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errx(1, "bs must be between 1 and %jd", (intmax_t)SSIZE_MAX);
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in.dbsz = out.dbsz = (size_t)res;
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}
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static void
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f_cbs(char *arg)
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{
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uintmax_t res;
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res = get_num(arg);
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if (res < 1 || res > SSIZE_MAX)
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errx(1, "cbs must be between 1 and %jd", (intmax_t)SSIZE_MAX);
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cbsz = (size_t)res;
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}
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static void
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f_count(char *arg)
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{
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intmax_t res;
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res = (intmax_t)get_num(arg);
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if (res < 0)
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errx(1, "count cannot be negative");
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if (res == 0)
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cpy_cnt = (uintmax_t)-1;
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else
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cpy_cnt = (uintmax_t)res;
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}
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static void
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f_files(char *arg)
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{
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files_cnt = get_num(arg);
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if (files_cnt < 1)
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errx(1, "files must be between 1 and %jd", (uintmax_t)-1);
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}
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static void
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f_fillchar(char *arg)
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{
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if (strlen(arg) != 1)
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errx(1, "need exactly one fill char");
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fill_char = arg[0];
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}
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static void
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f_ibs(char *arg)
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{
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uintmax_t res;
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if (!(ddflags & C_BS)) {
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res = get_num(arg);
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if (res < 1 || res > SSIZE_MAX)
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errx(1, "ibs must be between 1 and %jd",
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(intmax_t)SSIZE_MAX);
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in.dbsz = (size_t)res;
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}
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}
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static void
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f_if(char *arg)
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{
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in.name = arg;
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}
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static void
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f_obs(char *arg)
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{
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uintmax_t res;
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if (!(ddflags & C_BS)) {
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res = get_num(arg);
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if (res < 1 || res > SSIZE_MAX)
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errx(1, "obs must be between 1 and %jd",
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(intmax_t)SSIZE_MAX);
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out.dbsz = (size_t)res;
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}
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}
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static void
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f_of(char *arg)
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{
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out.name = arg;
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}
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static void
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f_seek(char *arg)
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{
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out.offset = get_off_t(arg);
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}
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static void
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f_skip(char *arg)
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{
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in.offset = get_off_t(arg);
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}
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static const struct conv {
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const char *name;
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u_int set, noset;
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const u_char *ctab;
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} clist[] = {
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{ "ascii", C_ASCII, C_EBCDIC, e2a_POSIX },
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{ "block", C_BLOCK, C_UNBLOCK, NULL },
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{ "ebcdic", C_EBCDIC, C_ASCII, a2e_POSIX },
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{ "ibm", C_EBCDIC, C_ASCII, a2ibm_POSIX },
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{ "lcase", C_LCASE, C_UCASE, NULL },
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{ "noerror", C_NOERROR, 0, NULL },
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{ "notrunc", C_NOTRUNC, 0, NULL },
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{ "oldascii", C_ASCII, C_EBCDIC, e2a_32V },
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{ "oldebcdic", C_EBCDIC, C_ASCII, a2e_32V },
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{ "oldibm", C_EBCDIC, C_ASCII, a2ibm_32V },
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{ "osync", C_OSYNC, C_BS, NULL },
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{ "pareven", C_PAREVEN, C_PARODD|C_PARSET|C_PARNONE, NULL},
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{ "parnone", C_PARNONE, C_PARODD|C_PARSET|C_PAREVEN, NULL},
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{ "parodd", C_PARODD, C_PAREVEN|C_PARSET|C_PARNONE, NULL},
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{ "parset", C_PARSET, C_PARODD|C_PAREVEN|C_PARNONE, NULL},
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{ "sparse", C_SPARSE, 0, NULL },
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{ "swab", C_SWAB, 0, NULL },
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{ "sync", C_SYNC, 0, NULL },
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{ "ucase", C_UCASE, C_LCASE, NULL },
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{ "unblock", C_UNBLOCK, C_BLOCK, NULL },
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};
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static void
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f_conv(char *arg)
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{
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struct conv *cp, tmp;
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while (arg != NULL) {
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tmp.name = strsep(&arg, ",");
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cp = bsearch(&tmp, clist, sizeof(clist) / sizeof(struct conv),
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sizeof(struct conv), c_conv);
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if (cp == NULL)
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errx(1, "unknown conversion %s", tmp.name);
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if (ddflags & cp->noset)
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errx(1, "%s: illegal conversion combination", tmp.name);
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ddflags |= cp->set;
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if (cp->ctab)
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ctab = cp->ctab;
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}
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}
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static int
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c_conv(const void *a, const void *b)
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{
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return (strcmp(((const struct conv *)a)->name,
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((const struct conv *)b)->name));
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}
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/*
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* Convert an expression of the following forms to a uintmax_t.
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* 1) A positive decimal number.
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* 2) A positive decimal number followed by a 'b' or 'B' (mult by 512).
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* 3) A positive decimal number followed by a 'k' or 'K' (mult by 1 << 10).
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* 4) A positive decimal number followed by a 'm' or 'M' (mult by 1 << 20).
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* 5) A positive decimal number followed by a 'g' or 'G' (mult by 1 << 30).
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* 5) A positive decimal number followed by a 'w' or 'W' (mult by sizeof int).
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* 6) Two or more positive decimal numbers (with/without [BbKkMmGgWw])
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* separated by 'x' or 'X' (also '*' for backwards compatibility),
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* specifying the product of the indicated values.
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*/
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static uintmax_t
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get_num(const char *val)
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{
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uintmax_t num, mult, prevnum;
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char *expr;
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errno = 0;
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num = strtouq(val, &expr, 0);
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if (errno != 0) /* Overflow or underflow. */
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err(1, "%s", oper);
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if (expr == val) /* No valid digits. */
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errx(1, "%s: illegal numeric value", oper);
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mult = 0;
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switch (*expr) {
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case 'B':
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case 'b':
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mult = 512;
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break;
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case 'K':
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case 'k':
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mult = 1 << 10;
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break;
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case 'M':
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case 'm':
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mult = 1 << 20;
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break;
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case 'G':
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case 'g':
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mult = 1 << 30;
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break;
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case 'W':
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case 'w':
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mult = sizeof(int);
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break;
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default:
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;
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}
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if (mult != 0) {
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prevnum = num;
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num *= mult;
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/* Check for overflow. */
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if (num / mult != prevnum)
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goto erange;
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expr++;
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}
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switch (*expr) {
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case '\0':
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break;
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case '*': /* Backward compatible. */
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case 'X':
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case 'x':
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mult = get_num(expr + 1);
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prevnum = num;
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num *= mult;
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if (num / mult == prevnum)
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break;
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erange:
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errx(1, "%s: %s", oper, strerror(ERANGE));
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default:
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errx(1, "%s: illegal numeric value", oper);
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}
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return (num);
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}
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/*
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* Convert an expression of the following forms to an off_t. This is the
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* same as get_num(), but it uses signed numbers.
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*
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* The major problem here is that an off_t may not necessarily be a intmax_t.
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*/
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static off_t
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get_off_t(const char *val)
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{
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intmax_t num, mult, prevnum;
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char *expr;
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errno = 0;
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num = strtoq(val, &expr, 0);
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if (errno != 0) /* Overflow or underflow. */
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err(1, "%s", oper);
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if (expr == val) /* No valid digits. */
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errx(1, "%s: illegal numeric value", oper);
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mult = 0;
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switch (*expr) {
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case 'B':
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case 'b':
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mult = 512;
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break;
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case 'K':
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case 'k':
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mult = 1 << 10;
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break;
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case 'M':
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case 'm':
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mult = 1 << 20;
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break;
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case 'G':
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case 'g':
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mult = 1 << 30;
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break;
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case 'W':
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case 'w':
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mult = sizeof(int);
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break;
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}
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if (mult != 0) {
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prevnum = num;
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num *= mult;
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/* Check for overflow. */
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if ((prevnum > 0) != (num > 0) || num / mult != prevnum)
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goto erange;
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expr++;
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}
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switch (*expr) {
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case '\0':
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break;
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case '*': /* Backward compatible. */
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case 'X':
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case 'x':
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mult = (intmax_t)get_off_t(expr + 1);
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prevnum = num;
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num *= mult;
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if ((prevnum > 0) == (num > 0) && num / mult == prevnum)
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break;
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erange:
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errx(1, "%s: %s", oper, strerror(ERANGE));
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default:
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errx(1, "%s: illegal numeric value", oper);
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}
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return (num);
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}
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