549 lines
12 KiB
C
549 lines
12 KiB
C
/* $NetBSD: parse.c,v 1.27 2011/09/04 20:27:27 joerg Exp $ */
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/*
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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. 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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#if HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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#endif
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#include <sys/cdefs.h>
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#if !defined(lint)
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#if 0
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static char sccsid[] = "@(#)parse.c 8.1 (Berkeley) 6/6/93";
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#else
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__RCSID("$NetBSD: parse.c,v 1.27 2011/09/04 20:27:27 joerg Exp $");
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#endif
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/file.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <inttypes.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 <util.h>
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#include "hexdump.h"
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__dead static void badcnt(char *);
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__dead static void badconv(char *);
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__dead static void badfmt(const char *);
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__dead static void badsfmt(void);
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FU *endfu; /* format at end-of-data */
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void
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addfile(char *name)
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{
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char *p;
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FILE *fp;
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int ch;
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char buf[2048 + 1];
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if ((fp = fopen(name, "r")) == NULL)
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err(1, "fopen %s", name);
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while (fgets(buf, sizeof(buf), fp)) {
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if (!(p = strchr(buf, '\n'))) {
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warnx("line too long.");
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while ((ch = getchar()) != '\n' && ch != EOF);
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continue;
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}
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*p = '\0';
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for (p = buf; *p && isspace((unsigned char)*p); ++p);
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if (!*p || *p == '#')
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continue;
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add(p);
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}
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(void)fclose(fp);
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}
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void
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add(const char *fmt)
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{
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const char *p;
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static FS **nextfs;
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FS *tfs;
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FU *tfu, **nextfu;
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const char *savep;
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/* start new linked list of format units */
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tfs = ecalloc(1, sizeof(FS));
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if (!fshead)
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fshead = tfs;
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else
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*nextfs = tfs;
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nextfs = &tfs->nextfs;
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nextfu = &tfs->nextfu;
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/* take the format string and break it up into format units */
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for (p = fmt;;) {
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/* skip leading white space */
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for (; isspace((unsigned char)*p); ++p);
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if (!*p)
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break;
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/* allocate a new format unit and link it in */
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tfu = ecalloc(1, sizeof(FU));
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*nextfu = tfu;
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nextfu = &tfu->nextfu;
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tfu->reps = 1;
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/* if leading digit, repetition count */
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if (isdigit((unsigned char)*p)) {
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for (savep = p; isdigit((unsigned char)*p); ++p);
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if (!isspace((unsigned char)*p) && *p != '/')
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badfmt(fmt);
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/* may overwrite either white space or slash */
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tfu->reps = atoi(savep);
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tfu->flags = F_SETREP;
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/* skip trailing white space */
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for (++p; isspace((unsigned char)*p); ++p);
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}
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/* skip slash and trailing white space */
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if (*p == '/')
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while (isspace((unsigned char)*++p));
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/* byte count */
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if (isdigit((unsigned char)*p)) {
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for (savep = p; isdigit((unsigned char)*p); ++p);
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if (!isspace((unsigned char)*p))
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badfmt(fmt);
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tfu->bcnt = atoi(savep);
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/* skip trailing white space */
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for (++p; isspace((unsigned char)*p); ++p);
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}
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/* format */
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if (*p != '"')
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badfmt(fmt);
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for (savep = ++p; *p != '"';)
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if (*p++ == 0)
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badfmt(fmt);
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tfu->fmt = emalloc(p - savep + 1);
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(void) strncpy(tfu->fmt, savep, p - savep);
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tfu->fmt[p - savep] = '\0';
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escape(tfu->fmt);
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p++;
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}
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}
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static const char *spec = ".#-+ 0123456789";
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int
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size(FS *fs)
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{
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FU *fu;
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int bcnt, cursize;
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char *fmt;
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int prec;
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/* figure out the data block size needed for each format unit */
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for (cursize = 0, fu = fs->nextfu; fu; fu = fu->nextfu) {
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if (fu->bcnt) {
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cursize += fu->bcnt * fu->reps;
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continue;
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}
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for (bcnt = prec = 0, fmt = fu->fmt; *fmt; ++fmt) {
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if (*fmt != '%')
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continue;
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/*
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* skip any special chars -- save precision in
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* case it's a %s format.
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*/
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while (strchr(spec + 1, *++fmt));
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if (*fmt == '.' && isdigit((unsigned char)*++fmt)) {
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prec = atoi(fmt);
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while (isdigit((unsigned char)*++fmt));
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}
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switch(*fmt) {
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case 'c':
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bcnt += 1;
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break;
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case 'd': case 'i': case 'o': case 'u':
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case 'x': case 'X':
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bcnt += 4;
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break;
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case 'e': case 'E': case 'f': case 'g': case 'G':
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bcnt += 8;
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break;
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case 's':
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bcnt += prec;
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break;
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case '_':
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switch(*++fmt) {
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case 'c': case 'p': case 'u':
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bcnt += 1;
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break;
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}
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}
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}
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cursize += bcnt * fu->reps;
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}
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return (cursize);
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}
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void
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rewrite(FS *fs)
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{
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enum { NOTOKAY, USEBCNT, USEPREC } sokay;
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PR *pr, **nextpr;
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FU *fu;
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char *p1, *p2;
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char savech, *fmtp, cs[sizeof(PRId64)];
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int nconv, prec;
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prec = 0;
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for (fu = fs->nextfu; fu; fu = fu->nextfu) {
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/*
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* Break each format unit into print units; each conversion
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* character gets its own.
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*/
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nextpr = &fu->nextpr;
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for (nconv = 0, fmtp = fu->fmt; *fmtp; nextpr = &pr->nextpr) {
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pr = ecalloc(1, sizeof(*pr));
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*nextpr = pr;
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/* Skip preceding text and up to the next % sign. */
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for (p1 = fmtp; *p1 && *p1 != '%'; ++p1);
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/* Only text in the string. */
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if (!*p1) {
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pr->fmt = fmtp;
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pr->flags = F_TEXT;
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break;
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}
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/*
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* Get precision for %s -- if have a byte count, don't
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* need it.
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*/
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if (fu->bcnt) {
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sokay = USEBCNT;
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/* Skip to conversion character. */
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for (++p1; *p1 && strchr(spec, *p1); ++p1);
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} else {
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/* Skip any special chars, field width. */
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while (*++p1 && strchr(spec + 1, *p1));
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if (*p1 == '.' &&
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isdigit((unsigned char)*++p1)) {
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sokay = USEPREC;
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prec = atoi(p1);
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while (isdigit((unsigned char)*++p1))
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continue;
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} else
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sokay = NOTOKAY;
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}
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p2 = *p1 ? p1 + 1 : p1; /* Set end pointer. */
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cs[0] = *p1; /* Set conversion string. */
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cs[1] = '\0';
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/*
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* Figure out the byte count for each conversion;
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* rewrite the format as necessary, set up blank-
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* padding for end of data.
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*/
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switch(cs[0]) {
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case 'c':
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pr->flags = F_CHAR;
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switch(fu->bcnt) {
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case 0: case 1:
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pr->bcnt = 1;
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break;
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default:
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p1[1] = '\0';
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badcnt(p1);
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}
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break;
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case 'd': case 'i':
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pr->flags = F_INT;
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goto isint;
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case 'o': case 'u': case 'x': case 'X':
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pr->flags = F_UINT;
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isint:
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/*
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* Regardless of pr->bcnt, all integer
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* values are cast to [u]int64_t before
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* being printed by display(). We
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* therefore need to use PRI?64 as the
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* format, where '?' could actually
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* be any of [diouxX]. We make the
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* assumption (not guaranteed by the
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* C99 standard) that we can derive
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* all the other PRI?64 values from
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* PRId64 simply by changing the last
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* character. For example, if PRId64 is
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* "lld" or "qd", and cs[0] is 'o', then
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* we end up with "llo" or "qo".
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*/
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savech = cs[0];
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strncpy(cs, PRId64, sizeof(PRId64) - 2);
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cs[sizeof(PRId64) - 2] = savech;
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cs[sizeof(PRId64) - 1] = '\0';
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switch(fu->bcnt) {
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case 0: case 4:
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pr->bcnt = 4;
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break;
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case 1:
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pr->bcnt = 1;
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break;
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case 2:
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pr->bcnt = 2;
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break;
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case 8:
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pr->bcnt = 8;
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break;
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default:
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p1[1] = '\0';
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badcnt(p1);
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}
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break;
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case 'e': case 'E': case 'f': case 'g': case 'G':
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pr->flags = F_DBL;
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switch(fu->bcnt) {
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case 0: case 8:
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pr->bcnt = 8;
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break;
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case 4:
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pr->bcnt = 4;
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break;
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default:
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p1[1] = '\0';
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badcnt(p1);
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}
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break;
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case 's':
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pr->flags = F_STR;
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switch(sokay) {
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case NOTOKAY:
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badsfmt();
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case USEBCNT:
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pr->bcnt = fu->bcnt;
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break;
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case USEPREC:
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pr->bcnt = prec;
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break;
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}
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break;
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case '_':
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++p2;
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switch(p1[1]) {
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case 'A':
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endfu = fu;
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fu->flags |= F_IGNORE;
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/* FALLTHROUGH */
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case 'a':
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pr->flags = F_ADDRESS;
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++p2;
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switch(p1[2]) {
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case 'd': case 'o': case'x':
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/*
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* See comments above for
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* the way we use PRId64.
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*/
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strncpy(cs, PRId64,
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sizeof(PRId64) - 2);
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cs[sizeof(PRId64) - 2] = p1[2];
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cs[sizeof(PRId64) - 1] = '\0';
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break;
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default:
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p1[3] = '\0';
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badconv(p1);
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}
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break;
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case 'c':
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pr->flags = F_C;
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/* cs[0] = 'c'; set in conv_c */
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goto isint2;
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case 'p':
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pr->flags = F_P;
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cs[0] = 'c';
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goto isint2;
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case 'u':
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pr->flags = F_U;
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/* cs[0] = 'c'; set in conv_u */
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isint2: switch(fu->bcnt) {
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case 0: case 1:
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pr->bcnt = 1;
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break;
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default:
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p1[2] = '\0';
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badcnt(p1);
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}
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break;
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default:
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p1[2] = '\0';
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badconv(p1);
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}
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break;
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default:
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p1[1] = '\0';
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badconv(p1);
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}
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/*
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* Copy to PR format string, set conversion character
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* pointer, update original.
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*/
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savech = *p2;
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p1[0] = '\0';
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pr->fmt = emalloc(strlen(fmtp) + strlen(cs) + 1);
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(void)strcpy(pr->fmt, fmtp);
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(void)strcat(pr->fmt, cs);
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*p2 = savech;
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pr->cchar = pr->fmt + (p1 - fmtp);
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fmtp = p2;
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/* Only one conversion character if byte count. */
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if (!(pr->flags&F_ADDRESS) && fu->bcnt && nconv++)
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errx(1,
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"byte count with multiple conversion characters");
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}
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/*
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* If format unit byte count not specified, figure it out
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* so can adjust rep count later.
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*/
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if (!fu->bcnt)
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for (pr = fu->nextpr; pr; pr = pr->nextpr)
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fu->bcnt += pr->bcnt;
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}
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/*
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* If the format string interprets any data at all, and it's
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* not the same as the blocksize, and its last format unit
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* interprets any data at all, and has no iteration count,
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* repeat it as necessary.
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*
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* If, rep count is greater than 1, no trailing whitespace
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* gets output from the last iteration of the format unit.
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*/
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for (fu = fs->nextfu; fu; fu = fu->nextfu) {
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if (!fu->nextfu && fs->bcnt < blocksize &&
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!(fu->flags&F_SETREP) && fu->bcnt)
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fu->reps += (blocksize - fs->bcnt) / fu->bcnt;
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if (fu->reps > 1) {
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if (!fu->nextpr)
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break;
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for (pr = fu->nextpr;; pr = pr->nextpr)
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if (!pr->nextpr)
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break;
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for (p1 = pr->fmt, p2 = NULL; *p1; ++p1)
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p2 = isspace((unsigned char)*p1) ? p1 : NULL;
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if (p2)
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pr->nospace = p2;
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}
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}
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#ifdef DEBUG
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for (fu = fs->nextfu; fu; fu = fu->nextfu) {
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(void)printf("fmt:");
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for (pr = fu->nextpr; pr; pr = pr->nextpr)
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(void)printf(" {%s}", pr->fmt);
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(void)printf("\n");
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}
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#endif
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}
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void
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escape(char *p1)
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{
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char *p2;
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/* alphabetic escape sequences have to be done in place */
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for (p2 = p1;; ++p1, ++p2) {
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if (!*p1) {
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*p2 = *p1;
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break;
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}
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if (*p1 == '\\')
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switch(*++p1) {
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case '\0':
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*p2 = '\\';
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*++p2 = '\0';
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return; /* incomplete escape sequence */
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case 'a':
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/* *p2 = '\a'; */
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*p2 = '\007';
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break;
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case 'b':
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*p2 = '\b';
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break;
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case 'f':
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*p2 = '\f';
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break;
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case 'n':
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*p2 = '\n';
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break;
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case 'r':
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*p2 = '\r';
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break;
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case 't':
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*p2 = '\t';
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break;
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case 'v':
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*p2 = '\v';
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break;
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default:
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*p2 = *p1;
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break;
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}
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else
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*p2 = *p1;
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}
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}
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static void
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badcnt(char *s)
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{
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errx(1, "%s: bad byte count", s);
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}
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static void
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badsfmt(void)
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{
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errx(1, "%%s: requires a precision or a byte count");
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}
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static void
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badfmt(const char *fmt)
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{
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errx(1, "\"%s\": bad format", fmt);
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}
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static void
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badconv(char *ch)
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{
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errx(1, "%%%s: bad conversion character", ch);
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}
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