4.3BSD-Reno/src/usr.bin/hexdump/parse.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: (1) source distributions retain this entire copyright
* notice and comment, and (2) distributions including binaries display
* the following acknowledgement: ``This product includes software
* developed by the University of California, Berkeley and its contributors''
* in the documentation or other materials provided with the distribution
* and in all advertising materials mentioning features or use of this
* software. 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 ``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[] = "@(#)parse.c 5.4 (Berkeley) 6/1/90";
#endif /* not lint */
#include <sys/types.h>
#include <sys/file.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include "hexdump.h"
FU *endfu; /* format at end-of-data */
addfile(name)
char *name;
{
register char *p;
FILE *fp;
int ch;
char buf[2048 + 1];
if (!(fp = fopen(name, "r"))) {
(void)fprintf(stderr, "hexdump: can't read %s.\n", name);
exit(1);
}
while (fgets(buf, sizeof(buf), fp)) {
if (!(p = index(buf, '\n'))) {
(void)fprintf(stderr, "hexdump: line too long.\n");
while ((ch = getchar()) != '\n' && ch != EOF);
continue;
}
*p = '\0';
for (p = buf; *p && isspace(*p); ++p);
if (!*p || *p == '#')
continue;
add(p);
}
(void)fclose(fp);
}
add(fmt)
char *fmt;
{
register char *p;
static FS **nextfs;
FS *tfs;
FU *tfu, **nextfu;
char savech, *savep, *emalloc(), *strdup();
/* start new linked list of format units */
/* NOSTRICT */
tfs = (FS *)emalloc(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 *)emalloc(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 != '/')
badfmt(fmt);
/* may overwrite either white space or slash */
savech = *p;
*p = '\0';
tfu->reps = atoi(savep);
tfu->flags = F_SETREP;
*p = savech;
/* 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))
badfmt(fmt);
savech = *p;
*p = '\0';
tfu->bcnt = atoi(savep);
*p = savech;
/* skip trailing white space */
for (++p; isspace(*p); ++p);
}
/* format */
if (*p != '"')
badfmt(fmt);
for (savep = ++p; *p != '"'; ++p);
if (*p != '"')
badfmt(fmt);
savech = *p;
*p = '\0';
if (!(tfu->fmt = strdup(savep)))
nomem();
escape(tfu->fmt);
*p++ = savech;
}
}
static char *spec = ".#-+ 0123456789";
size(fs)
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(spec + 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);
}
rewrite(fs)
FS *fs;
{
enum { NOTOKAY, USEBCNT, USEPREC } sokay;
register PR *pr, **nextpr;
register FU *fu;
register char *p1, *p2;
char savech, *fmtp;
int nconv, prec;
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 *)emalloc(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(spec, *p1); ++p1);
} else {
/* skip any special chars, field width */
while (index(spec + 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';
badcnt(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';
badconv(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';
badcnt(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';
badcnt(p1);
}
break;
case 's':
pr->flags = F_STR;
switch(sokay) {
case NOTOKAY:
badsfmt();
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';
badconv(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';
badcnt(p1);
}
break;
default:
p1[2] = '\0';
badconv(p1);
}
break;
default:
p1[1] = '\0';
badconv(p1);
}
/*
* copy to PR format string, set conversion character
* pointer, update original.
*/
savech = *p2;
p1[1] = '\0';
if (!(pr->fmt = strdup(fmtp)))
nomem();
*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++) {
(void)fprintf(stderr,
"hexdump: byte count with multiple conversion characters.\n");
exit(1);
}
}
/*
* 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;
}
}
escape(p1)
register char *p1;
{
register char *p2;
/* 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;
}
}
}
badcnt(s)
char *s;
{
(void)fprintf(stderr,
"hexdump: bad byte count for conversion character %s.\n", s);
exit(1);
}
badsfmt()
{
(void)fprintf(stderr,
"hexdump: %%s requires a precision or a byte count.\n");
exit(1);
}
badfmt(fmt)
char *fmt;
{
(void)fprintf(stderr, "hexdump: bad format {%s}\n", fmt);
exit(1);
}
badconv(ch)
char *ch;
{
(void)fprintf(stderr, "hexdump: bad conversion character %%%s.\n", ch);
exit(1);
}