minix/commands/hexdump/display.c

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2010-08-21 15:24:09 +02:00
/* $NetBSD: display.c,v 1.21 2009/01/18 21:34:32 apb Exp $ */
/*
* Copyright (c) 1989, 1993
* 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.
*/
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#include <sys/cdefs.h>
#if 0
#if !defined(lint)
#if 0
static char sccsid[] = "@(#)display.c 8.1 (Berkeley) 6/6/93";
#else
__RCSID("$NetBSD: display.c,v 1.21 2009/01/18 21:34:32 apb Exp $");
#endif
#endif /* not lint */
#endif
#include <sys/param.h>
#include <sys/stat.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <util.h>
#include "hexdump.h"
enum _vflag vflag = FIRST;
static off_t address; /* address/offset in stream */
static off_t eaddress; /* end address */
static inline void print(PR *, u_char *);
void
display(void)
{
FS *fs;
FU *fu;
PR *pr;
int cnt;
u_char *bp;
off_t saveaddress;
u_char savech, *savebp;
savech = 0;
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(pr, bp);
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, (int64_t)eaddress);
break;
case F_TEXT:
(void)printf("%s", pr->fmt);
break;
}
}
}
static inline void
print(PR *pr, u_char *bp)
{
double f8;
float f4;
int16_t s2;
int32_t s4;
#ifdef __LONG_LONG_SUPPORTED
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int64_t s8;
#endif
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uint16_t u2;
uint32_t u4;
#ifdef __LONG_LONG_SUPPORTED
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uint64_t u8;
#endif
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switch(pr->flags) {
case F_ADDRESS:
(void)printf(pr->fmt, (int64_t)address);
break;
case F_BPAD:
(void)printf(pr->fmt, "");
break;
case F_C:
conv_c(pr, bp);
break;
case F_CHAR:
(void)printf(pr->fmt, *bp);
break;
case F_DBL:
switch(pr->bcnt) {
case 4:
memmove(&f4, bp, sizeof(f4));
(void)printf(pr->fmt, f4);
break;
case 8:
memmove(&f8, bp, sizeof(f8));
(void)printf(pr->fmt, f8);
break;
}
break;
case F_INT:
switch(pr->bcnt) {
case 1:
(void)printf(pr->fmt, (int64_t)*bp);
break;
case 2:
memmove(&s2, bp, sizeof(s2));
(void)printf(pr->fmt, (int64_t)s2);
break;
case 4:
memmove(&s4, bp, sizeof(s4));
(void)printf(pr->fmt, (int64_t)s4);
break;
#ifdef __LONG_LONG_SUPPORTED
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case 8:
memmove(&s8, bp, sizeof(s8));
(void)printf(pr->fmt, (int64_t)s8);
break;
#endif
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}
break;
case F_P:
(void)printf(pr->fmt, isprint(*bp) ? *bp : '.');
break;
case F_STR:
(void)printf(pr->fmt, (char *)bp);
break;
case F_TEXT:
(void)printf("%s", pr->fmt);
break;
case F_U:
conv_u(pr, bp);
break;
case F_UINT:
switch(pr->bcnt) {
case 1:
(void)printf(pr->fmt, (uint64_t)*bp);
break;
case 2:
memmove(&u2, bp, sizeof(u2));
(void)printf(pr->fmt, (uint64_t)u2);
break;
case 4:
memmove(&u4, bp, sizeof(u4));
(void)printf(pr->fmt, (uint64_t)u4);
break;
#ifdef __LONG_LONG_SUPPORTED
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case 8:
memmove(&u8, bp, sizeof(u8));
(void)printf(pr->fmt, (uint64_t)u8);
break;
#endif
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}
break;
}
}
void
bpad(PR *pr)
{
static const char *spec = " -0+#";
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[0] = 's';
pr->cchar[1] = '\0';
for (p1 = pr->fmt; *p1 != '%'; ++p1);
for (p2 = ++p1; *p1 && strchr(spec, *p1); ++p1);
while ((*p2++ = *p1++) != '\0');
}
static char **_argv;
u_char *
get(void)
{
static int ateof = 1;
static u_char *curp, *savp;
int n;
int need, nread;
u_char *tmpp;
if (!curp) {
curp = ecalloc(blocksize, 1);
savp = ecalloc(blocksize, 1);
} else {
tmpp = curp;
curp = savp;
savp = tmpp;
address += 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(NULL))) {
if (need == blocksize)
return(NULL);
if (!need && vflag != ALL &&
!memcmp(curp, savp, nread)) {
if (vflag != DUP)
(void)printf("*\n");
return(NULL);
}
memset((char *)curp + nread, 0, 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))
warn("%s", _argv[-1]);
ateof = 1;
continue;
}
ateof = 0;
if (length != -1)
length -= n;
if (!(need -= n)) {
if (vflag == ALL || vflag == FIRST ||
memcmp(curp, savp, blocksize)) {
if (vflag == DUP || vflag == FIRST)
vflag = WAIT;
return(curp);
}
if (vflag == WAIT)
(void)printf("*\n");
vflag = DUP;
address += blocksize;
need = blocksize;
nread = 0;
}
else
nread += n;
}
}
int
next(char **argv)
{
static int done;
int statok;
if (argv) {
_argv = argv;
return(1);
}
for (;;) {
if (*_argv) {
if (!(freopen(*_argv, "r", stdin))) {
warn("%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 */
}
void
doskip(const char *fname, int statok)
{
int cnt;
struct stat sb;
if (statok) {
if (fstat(fileno(stdin), &sb))
err(1, "fstat %s", fname);
if (S_ISREG(sb.st_mode) && skip >= sb.st_size) {
address += sb.st_size;
skip -= sb.st_size;
return;
}
}
if (S_ISREG(sb.st_mode)) {
if (fseek(stdin, skip, SEEK_SET))
err(1, "fseek %s", fname);
address += skip;
skip = 0;
} else {
for (cnt = 0; cnt < skip; ++cnt)
if (getchar() == EOF)
break;
address += cnt;
skip -= cnt;
}
}