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date and time created 89/08/29 18:36:16 by bostic
[unix-history] / usr / src / usr.bin / hexdump / display.c
/*
* Copyright (c) 1989 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
static char sccsid[] = "@(#)display.c 5.1 (Berkeley) %G%";
#endif /* not lint */
#include <sys/param.h>
#include <sys/stat.h>
#include <unistd.h>
#include <ctype.h>
#include <stdio.h>
#include <strings.h>
#include "hexdump.h"
static off_t address; /* address/offset in stream */
static off_t eaddress; /* end address */
static off_t savaddress; /* saved address/offset in stream */
display()
{
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, *savebp, *get();
while (bp = get())
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) {
bpad(fu, pr, bp);
goto nextfs;
}
if (cnt == 1 && pr->nospace) {
savech = *pr->nospace;
*pr->nospace = '\0';
}
print(pr, bp);
if (cnt == 1 && pr->nospace)
*pr->nospace = savech;
}
}
nextfs: ;
}
if (endfu) {
/*
* if eaddress not set, file size was multiple of blocksize,
* and no partial block ever found.
*/
if (!eaddress)
eaddress = address + blocksize;
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;
}
}
}
print(pr, bp)
PR *pr;
u_char *bp;
{
switch(pr->flags) {
case F_ADDRESS:
(void)printf(pr->fmt, address);
break;
case F_C:
conv_c(pr, bp);
break;
case F_CHAR:
(void)printf(pr->fmt, *bp);
break;
case F_DBL: {
double dval;
float fval;
switch(pr->bcnt) {
case 4:
bcopy((char *)bp, (char *)&fval, sizeof(fval));
(void)printf(pr->fmt, fval);
break;
case 8:
bcopy((char *)bp, (char *)&dval, sizeof(dval));
(void)printf(pr->fmt, dval);
break;
}
break;
}
case F_INT: {
int ival;
short sval;
switch(pr->bcnt) {
case 1:
(void)printf(pr->fmt, (int)*bp);
break;
case 2:
bcopy((char *)bp, (char *)&sval, sizeof(sval));
(void)printf(pr->fmt, (int)sval);
break;
case 4:
bcopy((char *)bp, (char *)&ival, sizeof(ival));
(void)printf(pr->fmt, ival);
break;
}
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(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:
(void)printf(pr->fmt, (u_int)*bp);
break;
case 2:
bcopy((char *)bp, (char *)&sval, sizeof(sval));
(void)printf(pr->fmt, (u_int)sval);
break;
case 4:
bcopy((char *)bp, (char *)&ival, sizeof(ival));
(void)printf(pr->fmt, ival);
break;
}
break;
}
}
}
u_char *
get()
{
extern enum _vflag vflag;
extern int length;
static int ateof = 1;
static u_char *curp, *savp;
register int n;
int need, nread;
u_char *tmpp;
if (!curp) {
curp = (u_char *)emalloc(blocksize);
savp = (u_char *)emalloc(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)
(void)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) {
ateof = 1;
continue;
}
ateof = 0;
if (length != -1)
length -= n;
if (!(need -= n)) {
if (vflag == ALL || bcmp(curp, savp, blocksize)) {
if (vflag == DUP)
vflag = WAIT;
return(curp);
}
if (vflag == WAIT)
(void)printf("*\n");
vflag = DUP;
address = savaddress += blocksize;
need = blocksize;
nread = 0;
}
else
nread += n;
}
}
extern off_t skip; /* bytes to skip */
next(argv)
char **argv;
{
extern int errno, exitval;
static int done;
static char **_argv;
int statok;
if (argv) {
_argv = argv;
return(1);
}
for (;;) {
if (*_argv) {
if (!(freopen(*_argv, "r", stdin))) {
(void)fprintf(stderr, "hexdump: %s: %s\n",
*_argv, strerror(errno));
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 */
}
doskip(fname, statok)
char *fname;
int statok;
{
extern int errno;
struct stat sbuf;
if (statok) {
if (fstat(fileno(stdin), &sbuf)) {
(void)fprintf(stderr, "hexdump: %s: %s.\n",
fname, strerror(errno));
exit(1);
}
if (skip >= sbuf.st_size) {
skip -= sbuf.st_size;
address += sbuf.st_size;
return;
}
}
if (fseek(stdin, skip, SEEK_SET)) {
(void)fprintf(stderr, "hexdump: %s: %s.\n",
fname, strerror(errno));
exit(1);
}
savaddress = address += skip;
skip = 0;
}
char *
emalloc(size)
int size;
{
char *p, *malloc();
if (!(p = malloc((u_int)size)))
nomem();
bzero(p, size);
return(p);
}
nomem()
{
(void)fprintf(stderr, "hexdump: out of memory.\n");
exit(1);
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.