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https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
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380 lines
8.1 KiB
C
380 lines
8.1 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)display.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <errno.h>
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#include <ctype.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "hexdump.h"
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enum _vflag vflag = FIRST;
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static off_t address; /* address/offset in stream */
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static off_t eaddress; /* end address */
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static inline void print __P((PR *, u_char *));
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void
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display()
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{
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extern FU *endfu;
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register FS *fs;
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register FU *fu;
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register PR *pr;
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register int cnt;
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register u_char *bp;
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off_t saveaddress;
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u_char savech, *savebp;
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while (bp = get())
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for (fs = fshead, savebp = bp, saveaddress = address; fs;
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fs = fs->nextfs, bp = savebp, address = saveaddress)
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for (fu = fs->nextfu; fu; fu = fu->nextfu) {
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if (fu->flags&F_IGNORE)
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break;
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for (cnt = fu->reps; cnt; --cnt)
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for (pr = fu->nextpr; pr; address += pr->bcnt,
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bp += pr->bcnt, pr = pr->nextpr) {
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if (eaddress && address >= eaddress &&
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!(pr->flags & (F_TEXT|F_BPAD)))
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bpad(pr);
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if (cnt == 1 && pr->nospace) {
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savech = *pr->nospace;
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*pr->nospace = '\0';
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}
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print(pr, bp);
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if (cnt == 1 && pr->nospace)
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*pr->nospace = savech;
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}
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}
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if (endfu) {
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/*
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* If eaddress not set, error or file size was multiple of
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* blocksize, and no partial block ever found.
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*/
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if (!eaddress) {
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if (!address)
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return;
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eaddress = address;
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}
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for (pr = endfu->nextpr; pr; pr = pr->nextpr)
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switch(pr->flags) {
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case F_ADDRESS:
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(void)printf(pr->fmt, (quad_t)eaddress);
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break;
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case F_TEXT:
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(void)printf(pr->fmt);
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break;
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}
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}
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}
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static inline void
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print(pr, bp)
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PR *pr;
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u_char *bp;
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{
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double f8;
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float f4;
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int16_t s2;
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int8_t s8;
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int32_t s4;
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u_int16_t u2;
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u_int32_t u4;
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u_int64_t u8;
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switch(pr->flags) {
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case F_ADDRESS:
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(void)printf(pr->fmt, (quad_t)address);
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break;
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case F_BPAD:
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(void)printf(pr->fmt, "");
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break;
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case F_C:
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conv_c(pr, bp);
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break;
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case F_CHAR:
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(void)printf(pr->fmt, *bp);
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break;
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case F_DBL:
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switch(pr->bcnt) {
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case 4:
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bcopy(bp, &f4, sizeof(f4));
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(void)printf(pr->fmt, f4);
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break;
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case 8:
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bcopy(bp, &f8, sizeof(f8));
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(void)printf(pr->fmt, f8);
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break;
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}
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break;
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case F_INT:
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switch(pr->bcnt) {
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case 1:
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(void)printf(pr->fmt, (quad_t)*bp);
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break;
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case 2:
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bcopy(bp, &s2, sizeof(s2));
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(void)printf(pr->fmt, (quad_t)s2);
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break;
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case 4:
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bcopy(bp, &s4, sizeof(s4));
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(void)printf(pr->fmt, (quad_t)s4);
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break;
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case 8:
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bcopy(bp, &s8, sizeof(s8));
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(void)printf(pr->fmt, s8);
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break;
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}
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break;
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case F_P:
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(void)printf(pr->fmt, isprint(*bp) ? *bp : '.');
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break;
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case F_STR:
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(void)printf(pr->fmt, (char *)bp);
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break;
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case F_TEXT:
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(void)printf(pr->fmt);
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break;
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case F_U:
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conv_u(pr, bp);
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break;
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case F_UINT:
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switch(pr->bcnt) {
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case 1:
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(void)printf(pr->fmt, (u_quad_t)*bp);
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break;
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case 2:
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bcopy(bp, &u2, sizeof(u2));
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(void)printf(pr->fmt, (u_quad_t)u2);
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break;
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case 4:
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bcopy(bp, &u4, sizeof(u4));
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(void)printf(pr->fmt, (u_quad_t)u4);
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break;
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case 8:
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bcopy(bp, &u8, sizeof(u8));
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(void)printf(pr->fmt, u8);
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break;
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}
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break;
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}
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}
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void
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bpad(pr)
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PR *pr;
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{
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static char *spec = " -0+#";
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register char *p1, *p2;
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/*
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* Remove all conversion flags; '-' is the only one valid
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* with %s, and it's not useful here.
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*/
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pr->flags = F_BPAD;
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pr->cchar[0] = 's';
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pr->cchar[1] = '\0';
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for (p1 = pr->fmt; *p1 != '%'; ++p1);
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for (p2 = ++p1; *p1 && index(spec, *p1); ++p1);
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while (*p2++ = *p1++);
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}
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static char **_argv;
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u_char *
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get()
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{
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extern enum _vflag vflag;
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extern int length;
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static int ateof = 1;
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static u_char *curp, *savp;
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register int n;
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int need, nread;
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u_char *tmpp;
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if (!curp) {
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curp = emalloc(blocksize);
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savp = emalloc(blocksize);
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} else {
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tmpp = curp;
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curp = savp;
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savp = tmpp;
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address += blocksize;
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}
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for (need = blocksize, nread = 0;;) {
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/*
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* if read the right number of bytes, or at EOF for one file,
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* and no other files are available, zero-pad the rest of the
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* block and set the end flag.
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*/
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if (!length || ateof && !next((char **)NULL)) {
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if (need == blocksize)
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return((u_char *)NULL);
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if (vflag != ALL && !bcmp(curp, savp, nread)) {
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if (vflag != DUP)
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(void)printf("*\n");
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return((u_char *)NULL);
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}
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bzero((char *)curp + nread, need);
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eaddress = address + nread;
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return(curp);
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}
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n = fread((char *)curp + nread, sizeof(u_char),
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length == -1 ? need : MIN(length, need), stdin);
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if (!n) {
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if (ferror(stdin))
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(void)fprintf(stderr, "hexdump: %s: %s\n",
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_argv[-1], strerror(errno));
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ateof = 1;
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continue;
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}
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ateof = 0;
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if (length != -1)
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length -= n;
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if (!(need -= n)) {
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if (vflag == ALL || vflag == FIRST ||
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bcmp(curp, savp, blocksize)) {
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if (vflag == DUP || vflag == FIRST)
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vflag = WAIT;
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return(curp);
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}
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if (vflag == WAIT)
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(void)printf("*\n");
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vflag = DUP;
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address += blocksize;
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need = blocksize;
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nread = 0;
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}
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else
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nread += n;
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}
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}
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extern off_t skip; /* bytes to skip */
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int
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next(argv)
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char **argv;
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{
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extern int exitval;
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static int done;
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int statok;
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if (argv) {
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_argv = argv;
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return(1);
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}
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for (;;) {
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if (*_argv) {
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if (!(freopen(*_argv, "r", stdin))) {
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(void)fprintf(stderr, "hexdump: %s: %s\n",
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*_argv, strerror(errno));
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exitval = 1;
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++_argv;
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continue;
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}
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statok = done = 1;
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} else {
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if (done++)
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return(0);
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statok = 0;
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}
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if (skip)
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doskip(statok ? *_argv : "stdin", statok);
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if (*_argv)
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++_argv;
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if (!skip)
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return(1);
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}
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/* NOTREACHED */
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}
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void
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doskip(fname, statok)
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char *fname;
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int statok;
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{
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register int cnt;
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struct stat sb;
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if (statok) {
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if (fstat(fileno(stdin), &sb))
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err("%s: %s", fname, strerror(errno));
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if (S_ISREG(sb.st_mode) && skip >= sb.st_size) {
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address += sb.st_size;
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skip -= sb.st_size;
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return;
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}
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}
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if (S_ISREG(sb.st_mode)) {
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if (fseek(stdin, skip, SEEK_SET))
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err("%s: %s", fname, strerror(errno));
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address += skip;
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skip = 0;
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} else {
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for (cnt = 0; cnt < skip; ++cnt)
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if (getchar() == EOF)
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break;
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address += cnt;
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skip -= cnt;
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}
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}
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void *
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emalloc(size)
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int size;
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{
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void *p;
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if ((p = malloc((u_int)size)) == NULL)
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nomem();
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bzero(p, size);
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return(p);
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}
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void
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nomem()
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{
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err("%s", strerror(errno));
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}
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