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hush/libbb/dump.c
Glenn L McGrath 60281118d0 Introduce od and hexdump applets
2001-11-02 11:39:46 +00:00

864 lines
20 KiB
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/*
* Support code for the hexdump and od applets,
* based on code from util-linux v 2.11l
*
* Copyright (c) 1989
* The Regents of the University of California. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Original copyright notice is retained at the end of this file.
*/
#include <stdlib.h>
#include <string.h>
#include <ctype.h> /* for isdigit() */
#include "dump.h"
#include "libbb.h"
enum _vflag vflag = FIRST;
FS *fshead; /* head of format strings */
extern FS *fshead; /* head of format strings */
extern int blocksize;
static FU *endfu;
static char **_argv;
static off_t savaddress; /* saved address/offset in stream */
static off_t eaddress; /* end address */
static off_t address; /* address/offset in stream */
off_t skip; /* bytes to skip */
off_t saveaddress;
int exitval; /* final exit value */
int blocksize; /* data block size */
int length = -1; /* max bytes to read */
int size(FS *fs)
{
register FU *fu;
register int bcnt, cursize;
register char *fmt;
int prec;
/* figure out the data block size needed for each format unit */
for (cursize = 0, fu = fs->nextfu; fu; fu = fu->nextfu) {
if (fu->bcnt) {
cursize += fu->bcnt * fu->reps;
continue;
}
for (bcnt = prec = 0, fmt = fu->fmt; *fmt; ++fmt) {
if (*fmt != '%')
continue;
/*
* skip any special chars -- save precision in
* case it's a %s format.
*/
while (index(".#-+ 0123456789" + 1, *++fmt));
if (*fmt == '.' && isdigit(*++fmt)) {
prec = atoi(fmt);
while (isdigit(*++fmt));
}
switch(*fmt) {
case 'c':
bcnt += 1;
break;
case 'd': case 'i': case 'o': case 'u':
case 'x': case 'X':
bcnt += 4;
break;
case 'e': case 'E': case 'f': case 'g': case 'G':
bcnt += 8;
break;
case 's':
bcnt += prec;
break;
case '_':
switch(*++fmt) {
case 'c': case 'p': case 'u':
bcnt += 1;
break;
}
}
}
cursize += bcnt * fu->reps;
}
return(cursize);
}
void rewrite(FS *fs)
{
enum { NOTOKAY, USEBCNT, USEPREC } sokay;
register PR *pr, **nextpr = NULL;
register FU *fu;
register char *p1, *p2;
char savech, *fmtp;
int nconv, prec = 0;
for (fu = fs->nextfu; fu; fu = fu->nextfu) {
/*
* break each format unit into print units; each
* conversion character gets its own.
*/
for (nconv = 0, fmtp = fu->fmt; *fmtp; nextpr = &pr->nextpr) {
/* NOSTRICT */
pr = (PR *)xmalloc(sizeof(PR));
if (!fu->nextpr)
fu->nextpr = pr;
else
*nextpr = pr;
/* skip preceding text and up to the next % sign */
for (p1 = fmtp; *p1 && *p1 != '%'; ++p1);
/* only text in the string */
if (!*p1) {
pr->fmt = fmtp;
pr->flags = F_TEXT;
break;
}
/*
* get precision for %s -- if have a byte count, don't
* need it.
*/
if (fu->bcnt) {
sokay = USEBCNT;
/* skip to conversion character */
for (++p1; index(".#-+ 0123456789", *p1); ++p1);
} else {
/* skip any special chars, field width */
while (index(".#-+ 0123456789" + 1, *++p1));
if (*p1 == '.' && isdigit(*++p1)) {
sokay = USEPREC;
prec = atoi(p1);
while (isdigit(*++p1));
}
else
sokay = NOTOKAY;
}
p2 = p1 + 1; /* set end pointer */
/*
* figure out the byte count for each conversion;
* rewrite the format as necessary, set up blank-
* padding for end of data.
*/
switch(*p1) {
case 'c':
pr->flags = F_CHAR;
switch(fu->bcnt) {
case 0: case 1:
pr->bcnt = 1;
break;
default:
p1[1] = '\0';
error_msg_and_die("bad byte count for conversion character %s.", p1);
}
break;
case 'd': case 'i':
pr->flags = F_INT;
goto sw1;
case 'l':
++p2;
switch(p1[1]) {
case 'd': case 'i':
++p1;
pr->flags = F_INT;
goto sw1;
case 'o': case 'u': case 'x': case 'X':
++p1;
pr->flags = F_UINT;
goto sw1;
default:
p1[2] = '\0';
error_msg_and_die("hexdump: bad conversion character %%%s.\n", p1);
}
/* NOTREACHED */
case 'o': case 'u': case 'x': case 'X':
pr->flags = F_UINT;
sw1: switch(fu->bcnt) {
case 0: case 4:
pr->bcnt = 4;
break;
case 1:
pr->bcnt = 1;
break;
case 2:
pr->bcnt = 2;
break;
default:
p1[1] = '\0';
error_msg_and_die("bad byte count for conversion character %s.", p1);
}
break;
case 'e': case 'E': case 'f': case 'g': case 'G':
pr->flags = F_DBL;
switch(fu->bcnt) {
case 0: case 8:
pr->bcnt = 8;
break;
case 4:
pr->bcnt = 4;
break;
default:
p1[1] = '\0';
error_msg_and_die("bad byte count for conversion character %s.", p1);
}
break;
case 's':
pr->flags = F_STR;
switch(sokay) {
case NOTOKAY:
error_msg_and_die("%%s requires a precision or a byte count.");
case USEBCNT:
pr->bcnt = fu->bcnt;
break;
case USEPREC:
pr->bcnt = prec;
break;
}
break;
case '_':
++p2;
switch(p1[1]) {
case 'A':
endfu = fu;
fu->flags |= F_IGNORE;
/* FALLTHROUGH */
case 'a':
pr->flags = F_ADDRESS;
++p2;
switch(p1[2]) {
case 'd': case 'o': case'x':
*p1 = p1[2];
break;
default:
p1[3] = '\0';
error_msg_and_die("hexdump: bad conversion character %%%s.\n", p1);
}
break;
case 'c':
pr->flags = F_C;
/* *p1 = 'c'; set in conv_c */
goto sw2;
case 'p':
pr->flags = F_P;
*p1 = 'c';
goto sw2;
case 'u':
pr->flags = F_U;
/* *p1 = 'c'; set in conv_u */
sw2: switch(fu->bcnt) {
case 0: case 1:
pr->bcnt = 1;
break;
default:
p1[2] = '\0';
error_msg_and_die("bad byte count for conversion character %s.", p1);
}
break;
default:
p1[2] = '\0';
error_msg_and_die("hexdump: bad conversion character %%%s.\n", p1);
}
break;
default:
p1[1] = '\0';
error_msg_and_die("hexdump: bad conversion character %%%s.\n", p1);
}
/*
* copy to PR format string, set conversion character
* pointer, update original.
*/
savech = *p2;
p1[1] = '\0';
if (!(pr->fmt = strdup(fmtp)))
perror_msg_and_die("hexdump");
*p2 = savech;
pr->cchar = pr->fmt + (p1 - fmtp);
fmtp = p2;
/* only one conversion character if byte count */
if (!(pr->flags&F_ADDRESS) && fu->bcnt && nconv++) {
error_msg_and_die("hexdump: byte count with multiple conversion characters.\n");
}
}
/*
* if format unit byte count not specified, figure it out
* so can adjust rep count later.
*/
if (!fu->bcnt)
for (pr = fu->nextpr; pr; pr = pr->nextpr)
fu->bcnt += pr->bcnt;
}
/*
* if the format string interprets any data at all, and it's
* not the same as the blocksize, and its last format unit
* interprets any data at all, and has no iteration count,
* repeat it as necessary.
*
* if, rep count is greater than 1, no trailing whitespace
* gets output from the last iteration of the format unit.
*/
for (fu = fs->nextfu;; fu = fu->nextfu) {
if (!fu->nextfu && fs->bcnt < blocksize &&
!(fu->flags&F_SETREP) && fu->bcnt)
fu->reps += (blocksize - fs->bcnt) / fu->bcnt;
if (fu->reps > 1) {
for (pr = fu->nextpr;; pr = pr->nextpr)
if (!pr->nextpr)
break;
for (p1 = pr->fmt, p2 = NULL; *p1; ++p1)
p2 = isspace(*p1) ? p1 : NULL;
if (p2)
pr->nospace = p2;
}
if (!fu->nextfu)
break;
}
}
static void doskip(char *fname, int statok)
{
struct stat sbuf;
if (statok) {
if (fstat(fileno(stdin), &sbuf)) {
perror_msg_and_die("hexdump: %s", fname);
}
if ( ( ! (S_ISCHR(sbuf.st_mode) ||
S_ISBLK(sbuf.st_mode) ||
S_ISFIFO(sbuf.st_mode)) ) &&
skip >= sbuf.st_size) {
/* If size valid and skip >= size */
skip -= sbuf.st_size;
address += sbuf.st_size;
return;
}
}
if (fseek(stdin, skip, SEEK_SET)) {
perror_msg_and_die("hexdump: %s", fname);
}
savaddress = address += skip;
skip = 0;
}
int next(char **argv)
{
static int done;
int statok;
if (argv) {
_argv = argv;
return(1);
}
for (;;) {
if (*_argv) {
if (!(freopen(*_argv, "r", stdin))) {
perror_msg("%s", *_argv);
exitval = 1;
++_argv;
continue;
}
statok = done = 1;
} else {
if (done++)
return(0);
statok = 0;
}
if (skip)
doskip(statok ? *_argv : "stdin", statok);
if (*_argv)
++_argv;
if (!skip)
return(1);
}
/* NOTREACHED */
}
static u_char *
get(void)
{
static int ateof = 1;
static u_char *curp, *savp;
register int n;
int need, nread;
u_char *tmpp;
if (!curp) {
curp = (u_char *)xmalloc(blocksize);
savp = (u_char *)xmalloc(blocksize);
} else {
tmpp = curp;
curp = savp;
savp = tmpp;
address = savaddress += blocksize;
}
for (need = blocksize, nread = 0;;) {
/*
* if read the right number of bytes, or at EOF for one file,
* and no other files are available, zero-pad the rest of the
* block and set the end flag.
*/
if (!length || (ateof && !next((char **)NULL))) {
if (need == blocksize) {
return((u_char *)NULL);
}
if (vflag != ALL && !bcmp(curp, savp, nread)) {
if (vflag != DUP) {
printf("*\n");
}
return((u_char *)NULL);
}
bzero((char *)curp + nread, need);
eaddress = address + nread;
return(curp);
}
n = fread((char *)curp + nread, sizeof(u_char),
length == -1 ? need : MIN(length, need), stdin);
if (!n) {
if (ferror(stdin)) {
perror_msg("%s", _argv[-1]);
}
ateof = 1;
continue;
}
ateof = 0;
if (length != -1) {
length -= n;
}
if (!(need -= n)) {
if (vflag == ALL || vflag == FIRST ||
bcmp(curp, savp, blocksize)) {
if (vflag == DUP || vflag == FIRST) {
vflag = WAIT;
}
return(curp);
}
if (vflag == WAIT) {
printf("*\n");
}
vflag = DUP;
address = savaddress += blocksize;
need = blocksize;
nread = 0;
} else {
nread += n;
}
}
}
static void bpad(PR *pr)
{
register char *p1, *p2;
/*
* remove all conversion flags; '-' is the only one valid
* with %s, and it's not useful here.
*/
pr->flags = F_BPAD;
*pr->cchar = 's';
for (p1 = pr->fmt; *p1 != '%'; ++p1);
for (p2 = ++p1; *p1 && index(" -0+#", *p1); ++p1);
while ((*p2++ = *p1++) != 0) ;
}
void conv_c(PR *pr, u_char *p)
{
char buf[10], *str;
switch(*p) {
case '\0':
str = "\\0";
goto strpr;
/* case '\a': */
case '\007':
str = "\\a";
goto strpr;
case '\b':
str = "\\b";
goto strpr;
case '\f':
str = "\\f";
goto strpr;
case '\n':
str = "\\n";
goto strpr;
case '\r':
str = "\\r";
goto strpr;
case '\t':
str = "\\t";
goto strpr;
case '\v':
str = "\\v";
goto strpr;
default:
break;
}
if (isprint(*p)) {
*pr->cchar = 'c';
(void)printf(pr->fmt, *p);
} else {
sprintf(str = buf, "%03o", (int)*p);
strpr:
*pr->cchar = 's';
printf(pr->fmt, str);
}
}
void conv_u(PR *pr, u_char *p)
{
static char *list[] = {
"nul", "soh", "stx", "etx", "eot", "enq", "ack", "bel",
"bs", "ht", "lf", "vt", "ff", "cr", "so", "si",
"dle", "dcl", "dc2", "dc3", "dc4", "nak", "syn", "etb",
"can", "em", "sub", "esc", "fs", "gs", "rs", "us",
};
/* od used nl, not lf */
if (*p <= 0x1f) {
*pr->cchar = 's';
printf(pr->fmt, list[*p]);
} else if (*p == 0x7f) {
*pr->cchar = 's';
printf(pr->fmt, "del");
} else if (isprint(*p)) {
*pr->cchar = 'c';
printf(pr->fmt, *p);
} else {
*pr->cchar = 'x';
printf(pr->fmt, (int)*p);
}
}
void display(void)
{
// extern FU *endfu;
register FS *fs;
register FU *fu;
register PR *pr;
register int cnt;
register u_char *bp;
// off_t saveaddress;
u_char savech = 0, *savebp;
while ((bp = get()) != NULL) {
for (fs = fshead, savebp = bp, saveaddress = address; fs;
fs = fs->nextfs, bp = savebp, address = saveaddress) {
for (fu = fs->nextfu; fu; fu = fu->nextfu) {
if (fu->flags & F_IGNORE) {
break;
}
for (cnt = fu->reps; cnt; --cnt) {
for (pr = fu->nextpr; pr; address += pr->bcnt,
bp += pr->bcnt, pr = pr->nextpr) {
if (eaddress && address >= eaddress &&
!(pr->flags&(F_TEXT|F_BPAD))) {
bpad(pr);
}
if (cnt == 1 && pr->nospace) {
savech = *pr->nospace;
*pr->nospace = '\0';
}
// PRINT;
switch(pr->flags) {
case F_ADDRESS:
printf(pr->fmt, address);
break;
case F_BPAD:
printf(pr->fmt, "");
break;
case F_C:
conv_c(pr, bp);
break;
case F_CHAR:
printf(pr->fmt, *bp);
break;
case F_DBL: {
double dval;
float fval;
switch(pr->bcnt) {
case 4:
bcopy((char *)bp, (char *)&fval, sizeof(fval));
printf(pr->fmt, fval);
break;
case 8:
bcopy((char *)bp, (char *)&dval, sizeof(dval));
printf(pr->fmt, dval);
break;
}
break;
}
case F_INT: {
int ival;
short sval;
switch(pr->bcnt) {
case 1:
printf(pr->fmt, (int)*bp);
break;
case 2:
bcopy((char *)bp, (char *)&sval, sizeof(sval));
printf(pr->fmt, (int)sval);
break;
case 4:
bcopy((char *)bp, (char *)&ival, sizeof(ival));
printf(pr->fmt, ival);
break;
}
break;
}
case F_P:
printf(pr->fmt, isprint(*bp) ? *bp : '.');
break;
case F_STR:
printf(pr->fmt, (char *)bp);
break;
case F_TEXT:
printf(pr->fmt);
break;
case F_U:
conv_u(pr, bp);
break;
case F_UINT: {
u_int ival;
u_short sval;
switch(pr->bcnt) {
case 1:
printf(pr->fmt, (u_int)*bp);
break;
case 2:
bcopy((char *)bp, (char *)&sval, sizeof(sval));
printf(pr->fmt, (u_int)sval);
break;
case 4:
bcopy((char *)bp, (char *)&ival, sizeof(ival));
printf(pr->fmt, ival);
break;
}
break;
}
}
if (cnt == 1 && pr->nospace) {
*pr->nospace = savech;
}
}
}
}
}
}
if (endfu) {
/*
* if eaddress not set, error or file size was multiple of
* blocksize, and no partial block ever found.
*/
if (!eaddress) {
if (!address) {
return;
}
eaddress = address;
}
for (pr = endfu->nextpr; pr; pr = pr->nextpr) {
switch(pr->flags) {
case F_ADDRESS:
(void)printf(pr->fmt, eaddress);
break;
case F_TEXT:
(void)printf(pr->fmt);
break;
}
}
}
}
int dump(char **argv)
{
register FS *tfs;
/* figure out the data block size */
for (blocksize = 0, tfs = fshead; tfs; tfs = tfs->nextfs) {
tfs->bcnt = size(tfs);
if (blocksize < tfs->bcnt) {
blocksize = tfs->bcnt;
}
}
/* rewrite the rules, do syntax checking */
for (tfs = fshead; tfs; tfs = tfs->nextfs) {
rewrite(tfs);
}
next(argv);
display();
return(exitval);
}
void add(char *fmt)
{
register char *p;
register char *p1;
register char *p2;
static FS **nextfs;
FS *tfs;
FU *tfu, **nextfu;
char *savep;
/* start new linked list of format units */
/* NOSTRICT */
tfs = (FS *)xmalloc(sizeof(FS));
if (!fshead) {
fshead = tfs;
} else {
*nextfs = tfs;
}
nextfs = &tfs->nextfs;
nextfu = &tfs->nextfu;
/* take the format string and break it up into format units */
for (p = fmt;;) {
/* skip leading white space */
for (; isspace(*p); ++p);
if (!*p) {
break;
}
/* allocate a new format unit and link it in */
/* NOSTRICT */
tfu = (FU *)xmalloc(sizeof(FU));
*nextfu = tfu;
nextfu = &tfu->nextfu;
tfu->reps = 1;
/* if leading digit, repetition count */
if (isdigit(*p)) {
for (savep = p; isdigit(*p); ++p);
if (!isspace(*p) && *p != '/') {
error_msg_and_die("hexdump: bad format {%s}", fmt);
}
/* may overwrite either white space or slash */
tfu->reps = atoi(savep);
tfu->flags = F_SETREP;
/* skip trailing white space */
for (++p; isspace(*p); ++p);
}
/* skip slash and trailing white space */
if (*p == '/') {
while (isspace(*++p));
}
/* byte count */
if (isdigit(*p)) {
for (savep = p; isdigit(*p); ++p);
if (!isspace(*p)) {
error_msg_and_die("hexdump: bad format {%s}", fmt);
}
tfu->bcnt = atoi(savep);
/* skip trailing white space */
for (++p; isspace(*p); ++p);
}
/* format */
if (*p != '"') {
error_msg_and_die("hexdump: bad format {%s}", fmt);
}
for (savep = ++p; *p != '"';) {
if (*p++ == 0) {
error_msg_and_die("hexdump: bad format {%s}", fmt);
}
}
if (!(tfu->fmt = malloc(p - savep + 1))) {
perror_msg_and_die("hexdump");
}
strncpy(tfu->fmt, savep, p - savep);
tfu->fmt[p - savep] = '\0';
// escape(tfu->fmt);
p1 = tfu->fmt;
/* alphabetic escape sequences have to be done in place */
for (p2 = p1;; ++p1, ++p2) {
if (!*p1) {
*p2 = *p1;
break;
}
if (*p1 == '\\') {
switch(*++p1) {
case 'a':
/* *p2 = '\a'; */
*p2 = '\007';
break;
case 'b':
*p2 = '\b';
break;
case 'f':
*p2 = '\f';
break;
case 'n':
*p2 = '\n';
break;
case 'r':
*p2 = '\r';
break;
case 't':
*p2 = '\t';
break;
case 'v':
*p2 = '\v';
break;
default:
*p2 = *p1;
break;
}
}
}
p++;
}
}
/*
* Copyright (c) 1989 The Regents of the University of California.
* All rights reserved.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
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