/* $OpenBSD: args.c,v 1.14 2003/06/11 23:42:12 deraadt Exp $ */ /* $NetBSD: args.c,v 1.7 1996/03/01 01:18:58 jtc Exp $ */ /*- * Copyright (c) 1991, 1993, 1994 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Keith Muller of the University of California, San Diego and Lance * Visser of Convex Computer Corporation. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint #if 0 static char sccsid[] = "@(#)args.c 8.3 (Berkeley) 4/2/94"; #else static char rcsid[] = "$OpenBSD: args.c,v 1.14 2003/06/11 23:42:12 deraadt Exp $"; #endif #endif /* not lint */ #include <sys/types.h> #include <sys/time.h> #include <err.h> #include <errno.h> #include <limits.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include "dd.h" #include "extern.h" static int c_arg(const void *, const void *); static int c_conv(const void *, const void *); static void f_bs(char *); static void f_cbs(char *); static void f_conv(char *); static void f_count(char *); static void f_files(char *); static void f_ibs(char *); static void f_if(char *); static void f_obs(char *); static void f_of(char *); static void f_seek(char *); static void f_skip(char *); static size_t get_bsz(char *); static off_t get_off(char *); static const struct arg { char *name; void (*f)(char *); u_int set, noset; } args[] = { { "bs", f_bs, C_BS, C_BS|C_IBS|C_OBS|C_OSYNC }, { "cbs", f_cbs, C_CBS, C_CBS }, { "conv", f_conv, 0, 0 }, { "count", f_count, C_COUNT, C_COUNT }, { "files", f_files, C_FILES, C_FILES }, { "ibs", f_ibs, C_IBS, C_BS|C_IBS }, { "if", f_if, C_IF, C_IF }, { "obs", f_obs, C_OBS, C_BS|C_OBS }, { "of", f_of, C_OF, C_OF }, { "seek", f_seek, C_SEEK, C_SEEK }, { "skip", f_skip, C_SKIP, C_SKIP }, }; static char *oper; /* * args -- parse JCL syntax of dd. */ void jcl(char **argv) { struct arg *ap, tmp; char *arg; in.dbsz = out.dbsz = 512; while ((oper = *++argv) != NULL) { if ((oper = strdup(oper)) == NULL) errx(1, "out of memory"); if ((arg = strchr(oper, '=')) == NULL) errx(1, "unknown operand %s", oper); *arg++ = '\0'; if (!*arg) errx(1, "no value specified for %s", oper); tmp.name = oper; if (!(ap = (struct arg *)bsearch(&tmp, args, sizeof(args)/sizeof(struct arg), sizeof(struct arg), c_arg))) errx(1, "unknown operand %s", tmp.name); if (ddflags & ap->noset) errx(1, "%s: illegal argument combination or already set", tmp.name); ddflags |= ap->set; ap->f(arg); } /* Final sanity checks. */ if (ddflags & C_BS) { /* * Bs is turned off by any conversion -- we assume the user * just wanted to set both the input and output block sizes * and didn't want the bs semantics, so we don't warn. */ if (ddflags & (C_BLOCK|C_LCASE|C_SWAB|C_UCASE|C_UNBLOCK)) ddflags &= ~C_BS; /* Bs supersedes ibs and obs. */ if (ddflags & C_BS && ddflags & (C_IBS|C_OBS)) warnx("bs supersedes ibs and obs"); } /* * Ascii/ebcdic and cbs implies block/unblock. * Block/unblock requires cbs and vice-versa. */ if (ddflags & (C_BLOCK|C_UNBLOCK)) { if (!(ddflags & C_CBS)) errx(1, "record operations require cbs"); if (cbsz == 0) errx(1, "cbs cannot be zero"); cfunc = ddflags & C_BLOCK ? block : unblock; } else if (ddflags & C_CBS) { if (ddflags & (C_ASCII|C_EBCDIC)) { if (ddflags & C_ASCII) { ddflags |= C_UNBLOCK; cfunc = unblock; } else { ddflags |= C_BLOCK; cfunc = block; } } else errx(1, "cbs meaningless if not doing record operations"); if (cbsz == 0) errx(1, "cbs cannot be zero"); } else cfunc = def; if (in.dbsz == 0 || out.dbsz == 0) errx(1, "buffer sizes cannot be zero"); /* * Read and write take size_t's as arguments. Lseek, however, * takes an off_t (quad). */ if (in.dbsz > SIZE_T_MAX || out.dbsz > SIZE_T_MAX) errx(1, "buffer sizes cannot be greater than %u", SIZE_T_MAX); if (in.offset > QUAD_MAX / in.dbsz || out.offset > QUAD_MAX / out.dbsz) errx(1, "seek offsets cannot be larger than %qd", QUAD_MAX); } static int c_arg(const void *a, const void *b) { return (strcmp(((struct arg *)a)->name, ((struct arg *)b)->name)); } static void f_bs(char *arg) { in.dbsz = out.dbsz = get_bsz(arg); } static void f_cbs(char *arg) { cbsz = get_bsz(arg); } static void f_count(char *arg) { if ((cpy_cnt = get_bsz(arg)) == 0) cpy_cnt = (size_t)-1; } static void f_files(char *arg) { files_cnt = get_bsz(arg); } static void f_ibs(char *arg) { if (!(ddflags & C_BS)) in.dbsz = get_bsz(arg); } static void f_if(char *arg) { in.name = arg; } static void f_obs(char *arg) { if (!(ddflags & C_BS)) out.dbsz = get_bsz(arg); } static void f_of(char *arg) { out.name = arg; } static void f_seek(char *arg) { out.offset = get_off(arg); } static void f_skip(char *arg) { in.offset = get_off(arg); } #ifdef NO_CONV /* Build a small version (i.e. for a ramdisk root) */ static void f_conv(char *arg) { errx(1, "conv option disabled"); } #else /* NO_CONV */ static const struct conv { char *name; u_int set, noset; const u_char *ctab; } clist[] = { { "ascii", C_ASCII, C_EBCDIC, e2a_POSIX }, { "block", C_BLOCK, C_UNBLOCK, NULL }, { "ebcdic", C_EBCDIC, C_ASCII, a2e_POSIX }, { "ibm", C_EBCDIC, C_ASCII, a2ibm_POSIX }, { "lcase", C_LCASE, C_UCASE, NULL }, { "noerror", C_NOERROR, 0, NULL }, { "notrunc", C_NOTRUNC, 0, NULL }, { "oldascii", C_ASCII, C_EBCDIC, e2a_32V }, { "oldebcdic", C_EBCDIC, C_ASCII, a2e_32V }, { "oldibm", C_EBCDIC, C_ASCII, a2ibm_32V }, { "osync", C_OSYNC, C_BS, NULL }, { "swab", C_SWAB, 0, NULL }, { "sync", C_SYNC, 0, NULL }, { "ucase", C_UCASE, C_LCASE, NULL }, { "unblock", C_UNBLOCK, C_BLOCK, NULL }, }; static void f_conv(char *arg) { struct conv *cp, tmp; while (arg != NULL) { tmp.name = strsep(&arg, ","); if (!(cp = (struct conv *)bsearch(&tmp, clist, sizeof(clist)/sizeof(struct conv), sizeof(struct conv), c_conv))) errx(1, "unknown conversion %s", tmp.name); if (ddflags & cp->noset) errx(1, "%s: illegal conversion combination", tmp.name); ddflags |= cp->set; if (cp->ctab) ctab = cp->ctab; } } static int c_conv(const void *a, const void *b) { return (strcmp(((struct conv *)a)->name, ((struct conv *)b)->name)); } #endif /* NO_CONV */ /* * Convert an expression of the following forms to a size_t * 1) A positive decimal number. * 2) A positive decimal number followed by a b (mult by 512). * 3) A positive decimal number followed by a k (mult by 1024). * 4) A positive decimal number followed by a m (mult by 512). * 5) A positive decimal number followed by a w (mult by sizeof int) * 6) Two or more positive decimal numbers (with/without k,b or w). * separated by x (also * for backwards compatibility), specifying * the product of the indicated values. */ static size_t get_bsz(char *val) { size_t num, t; char *expr; num = strtoul(val, &expr, 0); if (num == SIZE_T_MAX) /* Overflow. */ err(1, "%s", oper); if (expr == val) /* No digits. */ errx(1, "%s: illegal numeric value", oper); switch(*expr) { case 'b': t = num; num *= 512; if (t > num) goto erange; ++expr; break; case 'k': t = num; num *= 1024; if (t > num) goto erange; ++expr; break; case 'm': t = num; num *= 1048576; if (t > num) goto erange; ++expr; break; case 'w': t = num; num *= sizeof(int); if (t > num) goto erange; ++expr; break; } switch(*expr) { case '\0': break; case '*': /* Backward compatible. */ case 'x': t = num; num *= get_bsz(expr + 1); if (t > num) erange: errx(1, "%s: %s", oper, strerror(ERANGE)); break; default: errx(1, "%s: illegal numeric value", oper); } return (num); } /* * Convert an expression of the following forms to an off_t * 1) A positive decimal number. * 2) A positive decimal number followed by a b (mult by 512). * 3) A positive decimal number followed by a k (mult by 1024). * 4) A positive decimal number followed by a m (mult by 512). * 5) A positive decimal number followed by a w (mult by sizeof int) * 6) Two or more positive decimal numbers (with/without k,b or w). * separated by x (also * for backwards compatibility), specifying * the product of the indicated values. */ static off_t get_off(char *val) { off_t num, t; char *expr; num = strtoq(val, &expr, 0); if (num == QUAD_MAX) /* Overflow. */ err(1, "%s", oper); if (expr == val) /* No digits. */ errx(1, "%s: illegal numeric value", oper); switch(*expr) { case 'b': t = num; num *= 512; if (t > num) goto erange; ++expr; break; case 'k': t = num; num *= 1024; if (t > num) goto erange; ++expr; break; case 'm': t = num; num *= 1048576; if (t > num) goto erange; ++expr; break; case 'w': t = num; num *= sizeof(int); if (t > num) goto erange; ++expr; break; } switch(*expr) { case '\0': break; case '*': /* Backward compatible. */ case 'x': t = num; num *= get_off(expr + 1); if (t > num) erange: errx(1, "%s: %s", oper, strerror(ERANGE)); break; default: errx(1, "%s: illegal numeric value", oper); } return (num); }