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prettyness police
[unix-history] / usr / src / bin / dd / args.c
/*-
* 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.
*
* %sccs.include.redist.c%
*/
#ifndef lint
static char sccsid[] = "@(#)args.c 8.3 (Berkeley) %G%";
#endif /* not lint */
#include <sys/types.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 __P((const void *, const void *));
static int c_conv __P((const void *, const void *));
static void f_bs __P((char *));
static void f_cbs __P((char *));
static void f_conv __P((char *));
static void f_count __P((char *));
static void f_files __P((char *));
static void f_ibs __P((char *));
static void f_if __P((char *));
static void f_obs __P((char *));
static void f_of __P((char *));
static void f_seek __P((char *));
static void f_skip __P((char *));
static u_long get_bsz __P((char *));
static struct arg {
char *name;
void (*f) __P((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(argv)
char **argv;
{
struct arg *ap, tmp;
char *arg;
in.dbsz = out.dbsz = 512;
while (oper = *++argv) {
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, write and seek calls take ints as arguments. Seek sizes
* could be larger if we wanted to do it in stages or check only
* regular files, but it's probably not worth it.
*/
if (in.dbsz > INT_MAX || out.dbsz > INT_MAX)
errx(1, "buffer sizes cannot be greater than %d", INT_MAX);
if (in.offset > INT_MAX / in.dbsz || out.offset > INT_MAX / out.dbsz)
errx(1, "seek offsets cannot be larger than %d", INT_MAX);
}
static int
c_arg(a, b)
const void *a, *b;
{
return (strcmp(((struct arg *)a)->name, ((struct arg *)b)->name));
}
static void
f_bs(arg)
char *arg;
{
in.dbsz = out.dbsz = (int)get_bsz(arg);
}
static void
f_cbs(arg)
char *arg;
{
cbsz = (int)get_bsz(arg);
}
static void
f_count(arg)
char *arg;
{
cpy_cnt = (u_int)get_bsz(arg);
if (!cpy_cnt)
terminate(0);
}
static void
f_files(arg)
char *arg;
{
files_cnt = (int)get_bsz(arg);
}
static void
f_ibs(arg)
char *arg;
{
if (!(ddflags & C_BS))
in.dbsz = (int)get_bsz(arg);
}
static void
f_if(arg)
char *arg;
{
in.name = arg;
}
static void
f_obs(arg)
char *arg;
{
if (!(ddflags & C_BS))
out.dbsz = (int)get_bsz(arg);
}
static void
f_of(arg)
char *arg;
{
out.name = arg;
}
static void
f_seek(arg)
char *arg;
{
out.offset = (u_int)get_bsz(arg);
}
static void
f_skip(arg)
char *arg;
{
in.offset = (u_int)get_bsz(arg);
}
static struct conv {
char *name;
u_int set, noset;
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(arg)
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(a, b)
const void *a, *b;
{
return (strcmp(((struct conv *)a)->name, ((struct conv *)b)->name));
}
/*
* Convert an expression of the following forms to an unsigned long.
* 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).
* seperated by x (also * for backwards compatibility), specifying
* the product of the indicated values.
*/
static u_long
get_bsz(val)
char *val;
{
u_long num, t;
char *expr;
num = strtoul(val, &expr, 0);
if (num == ULONG_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);
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.