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busybox/libbb/dump.c
Denis Vlasenko d02db89244 clean up TODO file. No real code changes.
2008-03-17 09:05:21 +00:00

812 lines
19 KiB
C
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/* vi: set sw=4 ts=4: */
/*
* 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.
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*
* Original copyright notice is retained at the end of this file.
*/
#include "libbb.h"
#include "dump.h"
enum _vflag bb_dump_vflag = FIRST;
FS *bb_dump_fshead; /* head of format strings */
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 bb_dump_skip; /* bytes to skip */
static int exitval; /* final exit value */
int bb_dump_blocksize; /* data block size */
int bb_dump_length = -1; /* max bytes to read */
static const char index_str[] ALIGN1 = ".#-+ 0123456789";
static const char size_conv_str[] ALIGN1 =
"\x1\x4\x4\x4\x4\x4\x4\x8\x8\x8\x8\010cdiouxXeEfgG";
static const char lcc[] ALIGN1 = "diouxX";
int bb_dump_size(FS * fs)
{
FU *fu;
int bcnt, cur_size;
char *fmt;
const char *p;
int prec;
/* figure out the data block bb_dump_size needed for each format unit */
for (cur_size = 0, fu = fs->nextfu; fu; fu = fu->nextfu) {
if (fu->bcnt) {
cur_size += fu->bcnt * fu->reps;
continue;
}
for (bcnt = prec = 0, fmt = fu->fmt; *fmt; ++fmt) {
if (*fmt != '%')
continue;
/*
* bb_dump_skip any special chars -- save precision in
* case it's a %s format.
*/
while (strchr(index_str + 1, *++fmt));
if (*fmt == '.' && isdigit(*++fmt)) {
prec = atoi(fmt);
while (isdigit(*++fmt));
}
p = strchr(size_conv_str + 12, *fmt);
if (!p) {
if (*fmt == 's') {
bcnt += prec;
} else if (*fmt == '_') {
++fmt;
if ((*fmt == 'c') || (*fmt == 'p') || (*fmt == 'u')) {
bcnt += 1;
}
}
} else {
bcnt += size_conv_str[p - (size_conv_str + 12)];
}
}
cur_size += bcnt * fu->reps;
}
return cur_size;
}
static void rewrite(FS * fs)
{
enum { NOTOKAY, USEBCNT, USEPREC } sokay;
PR *pr, **nextpr = NULL;
FU *fu;
char *p1, *p2, *p3;
char savech, *fmtp;
const char *byte_count_str;
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 */
/* DBU:[dvae@cray.com] zalloc so that forward ptrs start out NULL*/
pr = xzalloc(sizeof(PR));
if (!fu->nextpr)
fu->nextpr = pr;
/* ignore nextpr -- its unused inside the loop and is
* uninitialized 1st time through.
*/
/* bb_dump_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;
/* bb_dump_skip to conversion character */
for (++p1; strchr(index_str, *p1); ++p1);
} else {
/* bb_dump_skip any special chars, field width */
while (strchr(index_str + 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-
* pbb_dump_adding for end of data.
*/
if (*p1 == 'c') {
pr->flags = F_CHAR;
DO_BYTE_COUNT_1:
byte_count_str = "\001";
DO_BYTE_COUNT:
if (fu->bcnt) {
do {
if (fu->bcnt == *byte_count_str) {
break;
}
} while (*++byte_count_str);
}
/* Unlike the original, output the remainder of the format string. */
if (!*byte_count_str) {
bb_error_msg_and_die("bad byte count for conversion character %s", p1);
}
pr->bcnt = *byte_count_str;
} else if (*p1 == 'l') {
++p2;
++p1;
DO_INT_CONV:
{
const char *e;
e = strchr(lcc, *p1);
if (!e) {
goto DO_BAD_CONV_CHAR;
}
pr->flags = F_INT;
if (e > lcc + 1) {
pr->flags = F_UINT;
}
byte_count_str = "\004\002\001";
goto DO_BYTE_COUNT;
}
/* NOTREACHED */
} else if (strchr(lcc, *p1)) {
goto DO_INT_CONV;
} else if (strchr("eEfgG", *p1)) {
pr->flags = F_DBL;
byte_count_str = "\010\004";
goto DO_BYTE_COUNT;
} else if (*p1 == 's') {
pr->flags = F_STR;
if (sokay == USEBCNT) {
pr->bcnt = fu->bcnt;
} else if (sokay == USEPREC) {
pr->bcnt = prec;
} else { /* NOTOKAY */
bb_error_msg_and_die("%%s requires a precision or a byte count");
}
} else if (*p1 == '_') {
++p2;
switch (p1[1]) {
case 'A':
endfu = fu;
fu->flags |= F_IGNORE;
/* FALLTHROUGH */
case 'a':
pr->flags = F_ADDRESS;
++p2;
if ((p1[2] != 'd') && (p1[2] != 'o') && (p1[2] != 'x')) {
goto DO_BAD_CONV_CHAR;
}
*p1 = p1[2];
break;
case 'c':
pr->flags = F_C;
/* *p1 = 'c'; set in conv_c */
goto DO_BYTE_COUNT_1;
case 'p':
pr->flags = F_P;
*p1 = 'c';
goto DO_BYTE_COUNT_1;
case 'u':
pr->flags = F_U;
/* *p1 = 'c'; set in conv_u */
goto DO_BYTE_COUNT_1;
default:
goto DO_BAD_CONV_CHAR;
}
} else {
DO_BAD_CONV_CHAR:
bb_error_msg_and_die("bad conversion character %%%s", p1);
}
/*
* copy to PR format string, set conversion character
* pointer, update original.
*/
savech = *p2;
p1[1] = '\0';
pr->fmt = xstrdup(fmtp);
*p2 = savech;
pr->cchar = pr->fmt + (p1 - fmtp);
/* DBU:[dave@cray.com] w/o this, trailing fmt text, space is lost.
* Skip subsequent text and up to the next % sign and tack the
* additional text onto fmt: eg. if fmt is "%x is a HEX number",
* we lose the " is a HEX number" part of fmt.
*/
for (p3 = p2; *p3 && *p3 != '%'; p3++);
if (p3 > p2)
{
savech = *p3;
*p3 = '\0';
pr->fmt = xrealloc(pr->fmt, strlen(pr->fmt)+(p3-p2)+1);
strcat(pr->fmt, p2);
*p3 = savech;
p2 = p3;
}
fmtp = p2;
/* only one conversion character if byte count */
if (!(pr->flags & F_ADDRESS) && fu->bcnt && nconv++) {
bb_error_msg_and_die("byte count with multiple conversion characters");
}
}
/*
* 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 bb_dump_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 < bb_dump_blocksize &&
!(fu->flags & F_SETREP) && fu->bcnt)
fu->reps += (bb_dump_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 do_skip(const char *fname, int statok)
{
struct stat sbuf;
if (statok) {
if (fstat(STDIN_FILENO, &sbuf)) {
bb_simple_perror_msg_and_die(fname);
}
if ((!(S_ISCHR(sbuf.st_mode) ||
S_ISBLK(sbuf.st_mode) ||
S_ISFIFO(sbuf.st_mode))) && bb_dump_skip >= sbuf.st_size) {
/* If bb_dump_size valid and bb_dump_skip >= size */
bb_dump_skip -= sbuf.st_size;
address += sbuf.st_size;
return;
}
}
if (fseek(stdin, bb_dump_skip, SEEK_SET)) {
bb_simple_perror_msg_and_die(fname);
}
savaddress = address += bb_dump_skip;
bb_dump_skip = 0;
}
static int next(char **argv)
{
static smallint done;
int statok;
if (argv) {
_argv = argv;
return 1;
}
for (;;) {
if (*_argv) {
if (!(freopen(*_argv, "r", stdin))) {
bb_simple_perror_msg(*_argv);
exitval = 1;
++_argv;
continue;
}
done = statok = 1;
} else {
if (done)
return 0;
done = 1;
statok = 0;
}
if (bb_dump_skip)
do_skip(statok ? *_argv : "stdin", statok);
if (*_argv)
++_argv;
if (!bb_dump_skip)
return 1;
}
/* NOTREACHED */
}
static unsigned char *get(void)
{
static smallint ateof = 1;
static unsigned char *curp = NULL, *savp; /*DBU:[dave@cray.com]initialize curp */
int n;
int need, nread;
unsigned char *tmpp;
if (!curp) {
address = (off_t)0; /*DBU:[dave@cray.com] initialize,initialize..*/
curp = xmalloc(bb_dump_blocksize);
savp = xmalloc(bb_dump_blocksize);
} else {
tmpp = curp;
curp = savp;
savp = tmpp;
address = savaddress += bb_dump_blocksize;
}
for (need = bb_dump_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 (!bb_dump_length || (ateof && !next((char **) NULL))) {
if (need == bb_dump_blocksize) {
return NULL;
}
if (bb_dump_vflag != ALL && !memcmp(curp, savp, nread)) {
if (bb_dump_vflag != DUP) {
puts("*");
}
return NULL;
}
memset((char *) curp + nread, 0, need);
eaddress = address + nread;
return curp;
}
n = fread((char *) curp + nread, sizeof(unsigned char),
bb_dump_length == -1 ? need : MIN(bb_dump_length, need), stdin);
if (!n) {
if (ferror(stdin)) {
bb_simple_perror_msg(_argv[-1]);
}
ateof = 1;
continue;
}
ateof = 0;
if (bb_dump_length != -1) {
bb_dump_length -= n;
}
need -= n;
if (!need) {
if (bb_dump_vflag == ALL || bb_dump_vflag == FIRST
|| memcmp(curp, savp, bb_dump_blocksize)) {
if (bb_dump_vflag == DUP || bb_dump_vflag == FIRST) {
bb_dump_vflag = WAIT;
}
return curp;
}
if (bb_dump_vflag == WAIT) {
puts("*");
}
bb_dump_vflag = DUP;
address = savaddress += bb_dump_blocksize;
need = bb_dump_blocksize;
nread = 0;
} else {
nread += n;
}
}
}
static void bpad(PR * pr)
{
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 && strchr(" -0+#", *p1); ++p1)
if (pr->nospace) pr->nospace--;
while ((*p2++ = *p1++) != 0);
}
static const char conv_str[] ALIGN1 =
"\0\\0\0"
"\007\\a\0" /* \a */
"\b\\b\0"
"\f\\b\0"
"\n\\n\0"
"\r\\r\0"
"\t\\t\0"
"\v\\v\0"
;
static void conv_c(PR * pr, unsigned char * p)
{
const char *str = conv_str;
char buf[10];
do {
if (*p == *str) {
++str;
goto strpr;
}
str += 4;
} while (*str);
if (isprint(*p)) {
*pr->cchar = 'c';
(void) printf(pr->fmt, *p);
} else {
sprintf(buf, "%03o", (int) *p);
str = buf;
strpr:
*pr->cchar = 's';
printf(pr->fmt, str);
}
}
static void conv_u(PR * pr, unsigned char * p)
{
static const char list[] ALIGN1 =
"nul\0soh\0stx\0etx\0eot\0enq\0ack\0bel\0"
"bs\0_ht\0_lf\0_vt\0_ff\0_cr\0_so\0_si\0_"
"dle\0dcl\0dc2\0dc3\0dc4\0nak\0syn\0etb\0"
"can\0em\0_sub\0esc\0fs\0_gs\0_rs\0_us";
/* od used nl, not lf */
if (*p <= 0x1f) {
*pr->cchar = 's';
printf(pr->fmt, list + (4 * (int)*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);
}
}
static void display(void)
{
/* extern FU *endfu; */
FS *fs;
FU *fu;
PR *pr;
int cnt;
unsigned char *bp;
off_t saveaddress;
unsigned char savech = 0, *savebp;
while ((bp = get()) != NULL) {
for (fs = bb_dump_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, (unsigned int) 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:
memmove((char *) &fval, (char *) bp,
sizeof(fval));
printf(pr->fmt, fval);
break;
case 8:
memmove((char *) &dval, (char *) bp,
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:
memmove((char *) &sval, (char *) bp,
sizeof(sval));
printf(pr->fmt, (int) sval);
break;
case 4:
memmove((char *) &ival, (char *) bp,
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:{
unsigned int ival;
unsigned short sval;
switch (pr->bcnt) {
case 1:
printf(pr->fmt, (unsigned int) * bp);
break;
case 2:
memmove((char *) &sval, (char *) bp,
sizeof(sval));
printf(pr->fmt, (unsigned int) sval);
break;
case 4:
memmove((char *) &ival, (char *) bp,
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 bb_dump_size was multiple of
* bb_dump_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, (unsigned int) eaddress);
break;
case F_TEXT:
(void) printf(pr->fmt);
break;
}
}
}
}
int bb_dump_dump(char **argv)
{
FS *tfs;
/* figure out the data block bb_dump_size */
for (bb_dump_blocksize = 0, tfs = bb_dump_fshead; tfs; tfs = tfs->nextfs) {
tfs->bcnt = bb_dump_size(tfs);
if (bb_dump_blocksize < tfs->bcnt) {
bb_dump_blocksize = tfs->bcnt;
}
}
/* rewrite the rules, do syntax checking */
for (tfs = bb_dump_fshead; tfs; tfs = tfs->nextfs) {
rewrite(tfs);
}
next(argv);
display();
return exitval;
}
void bb_dump_add(const char *fmt)
{
const char *p;
char *p1;
char *p2;
static FS **nextfs;
FS *tfs;
FU *tfu, **nextfu;
const char *savep;
/* start new linked list of format units */
tfs = xzalloc(sizeof(FS)); /*DBU:[dave@cray.com] start out NULL */
if (!bb_dump_fshead) {
bb_dump_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;;) {
/* bb_dump_skip leading white space */
p = skip_whitespace(p);
if (!*p) {
break;
}
/* allocate a new format unit and link it in */
/* NOSTRICT */
/* DBU:[dave@cray.com] zalloc so that forward pointers start out NULL */
tfu = xzalloc(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 != '/') {
bb_error_msg_and_die("bad format {%s}", fmt);
}
/* may overwrite either white space or slash */
tfu->reps = atoi(savep);
tfu->flags = F_SETREP;
/* bb_dump_skip trailing white space */
p = skip_whitespace(++p);
}
/* bb_dump_skip slash and trailing white space */
if (*p == '/') {
p = skip_whitespace(++p);
}
/* byte count */
if (isdigit(*p)) {
// TODO: use bb_strtou
savep = p;
do p++; while (isdigit(*p));
if (!isspace(*p)) {
bb_error_msg_and_die("bad format {%s}", fmt);
}
tfu->bcnt = atoi(savep);
/* bb_dump_skip trailing white space */
p = skip_whitespace(++p);
}
/* format */
if (*p != '"') {
bb_error_msg_and_die("bad format {%s}", fmt);
}
for (savep = ++p; *p != '"';) {
if (*p++ == 0) {
bb_error_msg_and_die("bad format {%s}", fmt);
}
}
tfu->fmt = xmalloc(p - savep + 1);
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 == '\\') {
const char *cs = conv_str + 4;
++p1;
*p2 = *p1;
do {
if (*p1 == cs[2]) {
*p2 = cs[0];
break;
}
cs += 4;
} while (*cs);
}
}
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. 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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