472 lines
10 KiB
C
472 lines
10 KiB
C
/* $OpenBSD: args.c,v 1.29 2018/01/03 19:12:20 schwarze Exp $ */
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/* $NetBSD: args.c,v 1.7 1996/03/01 01:18:58 jtc Exp $ */
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/*-
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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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* 3. 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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#include <sys/types.h>
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#include <sys/time.h>
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#include <err.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdio.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 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_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 void f_status(char *);
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static size_t get_bsz(char *);
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static off_t get_off(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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{ "ibs", f_ibs, C_IBS, C_BS|C_IBS },
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{ "if", f_if, C_IF, C_IF },
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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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{ "seek", f_seek, C_SEEK, C_SEEK },
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{ "skip", f_skip, C_SKIP, C_SKIP },
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{ "status", f_status, C_STATUS,C_STATUS },
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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, "out of memory");
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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|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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if (cbsz == 0)
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errx(1, "cbs cannot be zero");
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} else
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cfunc = def;
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if (in.dbsz == 0 || out.dbsz == 0)
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errx(1, "buffer sizes cannot be zero");
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/*
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* Read and write take size_t's as arguments. Lseek, however,
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* takes an off_t.
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*/
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if (cbsz > SSIZE_MAX || in.dbsz > SSIZE_MAX || out.dbsz > SSIZE_MAX)
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errx(1, "buffer sizes cannot be greater than %zd",
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(ssize_t)SSIZE_MAX);
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if (in.offset > LLONG_MAX / in.dbsz || out.offset > LLONG_MAX / out.dbsz)
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errx(1, "seek offsets cannot be larger than %lld", LLONG_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(((struct arg *)a)->name, ((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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in.dbsz = out.dbsz = get_bsz(arg);
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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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cbsz = get_bsz(arg);
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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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if ((cpy_cnt = get_bsz(arg)) == 0)
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cpy_cnt = (size_t)-1;
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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_bsz(arg);
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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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if (!(ddflags & C_BS))
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in.dbsz = get_bsz(arg);
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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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if (!(ddflags & C_BS))
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out.dbsz = get_bsz(arg);
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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(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(arg);
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}
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static void
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f_status(char *arg)
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{
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if (strcmp(arg, "none") == 0)
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ddflags |= C_NOINFO;
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else if (strcmp(arg, "noxfer") == 0)
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ddflags |= C_NOXFER;
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else
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errx(1, "unknown status %s", 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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#ifndef NO_CONV
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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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{ "osync", C_OSYNC, C_BS, 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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#endif
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{ "noerror", C_NOERROR, 0, NULL },
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{ "notrunc", C_NOTRUNC, 0, NULL },
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{ NULL, 0, 0, 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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const struct conv *cp;
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const char *name;
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while (arg != NULL) {
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name = strsep(&arg, ",");
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for (cp = &clist[0]; cp->name; cp++)
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if (strcmp(name, cp->name) == 0)
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break;
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if (!cp->name)
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errx(1, "unknown conversion %s", name);
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if (ddflags & cp->noset)
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errx(1, "%s: illegal conversion combination", 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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/*
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* Convert an expression of the following forms to a size_t
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* 1) A positive decimal number, optionally followed by
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* b - multiply by 512.
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* k, m or g - multiply by 1024 each.
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* w - multiply by sizeof int
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* 2) Two or more of the above, separated by x
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* (or * for backwards compatibility), specifying
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* the product of the indicated values.
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*/
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static size_t
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get_bsz(char *val)
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{
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size_t num, t;
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char *expr;
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if (strchr(val, '-'))
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errx(1, "%s: illegal numeric value", oper);
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errno = 0;
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num = strtoul(val, &expr, 0);
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if (num == ULONG_MAX && errno == ERANGE) /* Overflow. */
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err(1, "%s", oper);
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if (expr == val) /* No digits. */
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errx(1, "%s: illegal numeric value", oper);
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switch(*expr) {
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case 'b':
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t = num;
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num *= 512;
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if (t > num)
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goto erange;
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++expr;
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break;
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case 'g':
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case 'G':
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t = num;
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num *= 1024;
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if (t > num)
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goto erange;
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/* fallthrough */
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case 'm':
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case 'M':
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t = num;
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num *= 1024;
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if (t > num)
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goto erange;
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/* fallthrough */
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case 'k':
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case 'K':
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t = num;
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num *= 1024;
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if (t > num)
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goto erange;
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++expr;
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break;
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case 'w':
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t = num;
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num *= sizeof(int);
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if (t > num)
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goto erange;
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++expr;
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break;
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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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t = num;
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num *= get_bsz(expr + 1);
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if (t > num)
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goto erange;
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break;
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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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erange:
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errc(1, ERANGE, "%s", oper);
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}
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/*
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* Convert an expression of the following forms to an off_t
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* 1) A positive decimal number, optionally followed by
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* b - multiply by 512.
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* k, m or g - multiply by 1024 each.
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* w - multiply by sizeof int
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* 2) Two or more of the above, separated by x
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* (or * for backwards compatibility), specifying
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* the product of the indicated values.
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*/
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static off_t
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get_off(char *val)
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{
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off_t num, t;
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char *expr;
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errno = 0;
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num = strtoll(val, &expr, 0);
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if (num == LLONG_MAX && errno == ERANGE) /* Overflow. */
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err(1, "%s", oper);
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if (expr == val) /* No digits. */
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errx(1, "%s: illegal numeric value", oper);
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switch(*expr) {
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case 'b':
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t = num;
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num *= 512;
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if (t > num)
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goto erange;
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++expr;
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break;
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case 'g':
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case 'G':
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t = num;
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num *= 1024;
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if (t > num)
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goto erange;
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/* fallthrough */
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case 'm':
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case 'M':
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t = num;
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num *= 1024;
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if (t > num)
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goto erange;
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/* fallthrough */
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case 'k':
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case 'K':
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t = num;
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num *= 1024;
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if (t > num)
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goto erange;
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++expr;
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break;
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case 'w':
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t = num;
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num *= sizeof(int);
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if (t > num)
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goto erange;
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++expr;
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break;
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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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t = num;
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num *= get_off(expr + 1);
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if (t > num)
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goto erange;
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break;
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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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erange:
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errc(1, ERANGE, "%s", oper);
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}
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