1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#ifndef lint
33#if 0
34static char sccsid[] = "@(#)parse.c	8.1 (Berkeley) 6/6/93";
35#endif
36#endif /* not lint */
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD$");
39
40#include <sys/types.h>
41
42#include <err.h>
43#include <fcntl.h>
44#include <stdio.h>
45#include <stdlib.h>
46#include <ctype.h>
47#include <string.h>
48#include "hexdump.h"
49
50FU *endfu;					/* format at end-of-data */
51
52void
53addfile(const char *name)
54{
55	unsigned char *p;
56	FILE *fp;
57	int ch;
58	char buf[2048 + 1];
59
60	if ((fp = fopen(name, "r")) == NULL)
61		err(1, "%s", name);
62	while (fgets(buf, sizeof(buf), fp)) {
63		if (!(p = strchr(buf, '\n'))) {
64			warnx("line too long");
65			while ((ch = getchar()) != '\n' && ch != EOF);
66			continue;
67		}
68		*p = '\0';
69		for (p = buf; *p && isspace(*p); ++p);
70		if (!*p || *p == '#')
71			continue;
72		add(p);
73	}
74	(void)fclose(fp);
75}
76
77void
78add(const char *fmt)
79{
80	unsigned const char *p, *savep;
81	static FS **nextfs;
82	FS *tfs;
83	FU *tfu, **nextfu;
84
85	/* start new linked list of format units */
86	if ((tfs = calloc(1, sizeof(FS))) == NULL)
87		err(1, NULL);
88	if (!fshead)
89		fshead = tfs;
90	else
91		*nextfs = tfs;
92	nextfs = &tfs->nextfs;
93	nextfu = &tfs->nextfu;
94
95	/* take the format string and break it up into format units */
96	for (p = fmt;;) {
97		/* skip leading white space */
98		for (; isspace(*p); ++p);
99		if (!*p)
100			break;
101
102		/* allocate a new format unit and link it in */
103		if ((tfu = calloc(1, sizeof(FU))) == NULL)
104			err(1, NULL);
105		*nextfu = tfu;
106		nextfu = &tfu->nextfu;
107		tfu->reps = 1;
108
109		/* if leading digit, repetition count */
110		if (isdigit(*p)) {
111			for (savep = p; isdigit(*p); ++p);
112			if (!isspace(*p) && *p != '/')
113				badfmt(fmt);
114			/* may overwrite either white space or slash */
115			tfu->reps = atoi(savep);
116			tfu->flags = F_SETREP;
117			/* skip trailing white space */
118			for (++p; isspace(*p); ++p);
119		}
120
121		/* skip slash and trailing white space */
122		if (*p == '/')
123			while (isspace(*++p));
124
125		/* byte count */
126		if (isdigit(*p)) {
127			for (savep = p; isdigit(*p); ++p);
128			if (!isspace(*p))
129				badfmt(fmt);
130			tfu->bcnt = atoi(savep);
131			/* skip trailing white space */
132			for (++p; isspace(*p); ++p);
133		}
134
135		/* format */
136		if (*p != '"')
137			badfmt(fmt);
138		for (savep = ++p; *p != '"';)
139			if (*p++ == 0)
140				badfmt(fmt);
141		if (!(tfu->fmt = malloc(p - savep + 1)))
142			err(1, NULL);
143		(void) strlcpy(tfu->fmt, savep, p - savep + 1);
144		escape(tfu->fmt);
145		p++;
146	}
147}
148
149static const char *spec = ".#-+ 0123456789";
150
151int
152size(FS *fs)
153{
154	FU *fu;
155	int bcnt, cursize;
156	unsigned char *fmt;
157	int prec;
158
159	/* figure out the data block size needed for each format unit */
160	for (cursize = 0, fu = fs->nextfu; fu; fu = fu->nextfu) {
161		if (fu->bcnt) {
162			cursize += fu->bcnt * fu->reps;
163			continue;
164		}
165		for (bcnt = prec = 0, fmt = fu->fmt; *fmt; ++fmt) {
166			if (*fmt != '%')
167				continue;
168			/*
169			 * skip any special chars -- save precision in
170			 * case it's a %s format.
171			 */
172			while (strchr(spec + 1, *++fmt));
173			if (*fmt == '.' && isdigit(*++fmt)) {
174				prec = atoi(fmt);
175				while (isdigit(*++fmt));
176			}
177			switch(*fmt) {
178			case 'c':
179				bcnt += 1;
180				break;
181			case 'd': case 'i': case 'o': case 'u':
182			case 'x': case 'X':
183				bcnt += 4;
184				break;
185			case 'e': case 'E': case 'f': case 'g': case 'G':
186				bcnt += 8;
187				break;
188			case 's':
189				bcnt += prec;
190				break;
191			case '_':
192				switch(*++fmt) {
193				case 'c': case 'p': case 'u':
194					bcnt += 1;
195					break;
196				}
197			}
198		}
199		cursize += bcnt * fu->reps;
200	}
201	return (cursize);
202}
203
204void
205rewrite(FS *fs)
206{
207	enum { NOTOKAY, USEBCNT, USEPREC } sokay;
208	PR *pr, **nextpr;
209	FU *fu;
210	unsigned char *p1, *p2, *fmtp;
211	char savech, cs[3];
212	int nconv, prec;
213
214	prec = 0;
215
216	for (fu = fs->nextfu; fu; fu = fu->nextfu) {
217		/*
218		 * Break each format unit into print units; each conversion
219		 * character gets its own.
220		 */
221		nextpr = &fu->nextpr;
222		for (nconv = 0, fmtp = fu->fmt; *fmtp; nextpr = &pr->nextpr) {
223			if ((pr = calloc(1, sizeof(PR))) == NULL)
224				err(1, NULL);
225			*nextpr = pr;
226
227			/* Skip preceding text and up to the next % sign. */
228			for (p1 = fmtp; *p1 && *p1 != '%'; ++p1);
229
230			/* Only text in the string. */
231			if (!*p1) {
232				pr->fmt = fmtp;
233				pr->flags = F_TEXT;
234				break;
235			}
236
237			/*
238			 * Get precision for %s -- if have a byte count, don't
239			 * need it.
240			 */
241			if (fu->bcnt) {
242				sokay = USEBCNT;
243				/* Skip to conversion character. */
244				for (++p1; strchr(spec, *p1); ++p1);
245			} else {
246				/* Skip any special chars, field width. */
247				while (strchr(spec + 1, *++p1));
248				if (*p1 == '.' && isdigit(*++p1)) {
249					sokay = USEPREC;
250					prec = atoi(p1);
251					while (isdigit(*++p1));
252				} else
253					sokay = NOTOKAY;
254			}
255
256			p2 = *p1 ? p1 + 1 : p1;	/* Set end pointer -- make sure
257						 * that it's non-NUL/-NULL first
258						 * though. */
259			cs[0] = *p1;		/* Set conversion string. */
260			cs[1] = '\0';
261
262			/*
263			 * Figure out the byte count for each conversion;
264			 * rewrite the format as necessary, set up blank-
265			 * padding for end of data.
266			 */
267			switch(cs[0]) {
268			case 'c':
269				pr->flags = F_CHAR;
270				switch(fu->bcnt) {
271				case 0: case 1:
272					pr->bcnt = 1;
273					break;
274				default:
275					p1[1] = '\0';
276					badcnt(p1);
277				}
278				break;
279			case 'd': case 'i':
280				pr->flags = F_INT;
281				goto isint;
282			case 'o': case 'u': case 'x': case 'X':
283				pr->flags = F_UINT;
284isint:				cs[2] = '\0';
285				cs[1] = cs[0];
286				cs[0] = 'q';
287				switch(fu->bcnt) {
288				case 0: case 4:
289					pr->bcnt = 4;
290					break;
291				case 1:
292					pr->bcnt = 1;
293					break;
294				case 2:
295					pr->bcnt = 2;
296					break;
297				default:
298					p1[1] = '\0';
299					badcnt(p1);
300				}
301				break;
302			case 'e': case 'E': case 'f': case 'g': case 'G':
303				pr->flags = F_DBL;
304				switch(fu->bcnt) {
305				case 0: case 8:
306					pr->bcnt = 8;
307					break;
308				case 4:
309					pr->bcnt = 4;
310					break;
311				default:
312					if (fu->bcnt == sizeof(long double)) {
313						cs[2] = '\0';
314						cs[1] = cs[0];
315						cs[0] = 'L';
316						pr->bcnt = sizeof(long double);
317					} else {
318						p1[1] = '\0';
319						badcnt(p1);
320					}
321				}
322				break;
323			case 's':
324				pr->flags = F_STR;
325				switch(sokay) {
326				case NOTOKAY:
327					badsfmt();
328				case USEBCNT:
329					pr->bcnt = fu->bcnt;
330					break;
331				case USEPREC:
332					pr->bcnt = prec;
333					break;
334				}
335				break;
336			case '_':
337				++p2;
338				switch(p1[1]) {
339				case 'A':
340					endfu = fu;
341					fu->flags |= F_IGNORE;
342					/* FALLTHROUGH */
343				case 'a':
344					pr->flags = F_ADDRESS;
345					++p2;
346					switch(p1[2]) {
347					case 'd': case 'o': case'x':
348						cs[0] = 'q';
349						cs[1] = p1[2];
350						cs[2] = '\0';
351						break;
352					default:
353						p1[3] = '\0';
354						badconv(p1);
355					}
356					break;
357				case 'c':
358					pr->flags = F_C;
359					/* cs[0] = 'c';	set in conv_c */
360					goto isint2;
361				case 'p':
362					pr->flags = F_P;
363					cs[0] = 'c';
364					goto isint2;
365				case 'u':
366					pr->flags = F_U;
367					/* cs[0] = 'c';	set in conv_u */
368isint2:					switch(fu->bcnt) {
369					case 0: case 1:
370						pr->bcnt = 1;
371						break;
372					default:
373						p1[2] = '\0';
374						badcnt(p1);
375					}
376					break;
377				default:
378					p1[2] = '\0';
379					badconv(p1);
380				}
381				break;
382			default:
383				p1[1] = '\0';
384				badconv(p1);
385			}
386
387			/*
388			 * Copy to PR format string, set conversion character
389			 * pointer, update original.
390			 */
391			savech = *p2;
392			p1[0] = '\0';
393			if (asprintf(&pr->fmt, "%s%s", fmtp, cs) == -1)
394				err(1, NULL);
395			*p2 = savech;
396			pr->cchar = pr->fmt + (p1 - fmtp);
397			fmtp = p2;
398
399			/* Only one conversion character if byte count. */
400			if (!(pr->flags&F_ADDRESS) && fu->bcnt && nconv++)
401	    errx(1, "byte count with multiple conversion characters");
402		}
403		/*
404		 * If format unit byte count not specified, figure it out
405		 * so can adjust rep count later.
406		 */
407		if (!fu->bcnt)
408			for (pr = fu->nextpr; pr; pr = pr->nextpr)
409				fu->bcnt += pr->bcnt;
410	}
411	/*
412	 * If the format string interprets any data at all, and it's
413	 * not the same as the blocksize, and its last format unit
414	 * interprets any data at all, and has no iteration count,
415	 * repeat it as necessary.
416	 *
417	 * If, rep count is greater than 1, no trailing whitespace
418	 * gets output from the last iteration of the format unit.
419	 */
420	for (fu = fs->nextfu; fu; fu = fu->nextfu) {
421		if (!fu->nextfu && fs->bcnt < blocksize &&
422		    !(fu->flags&F_SETREP) && fu->bcnt)
423			fu->reps += (blocksize - fs->bcnt) / fu->bcnt;
424		if (fu->reps > 1) {
425			for (pr = fu->nextpr;; pr = pr->nextpr)
426				if (!pr->nextpr)
427					break;
428			for (p1 = pr->fmt, p2 = NULL; *p1; ++p1)
429				p2 = isspace(*p1) ? p1 : NULL;
430			if (p2)
431				pr->nospace = p2;
432		}
433	}
434#ifdef DEBUG
435	for (fu = fs->nextfu; fu; fu = fu->nextfu) {
436		(void)printf("fmt:");
437		for (pr = fu->nextpr; pr; pr = pr->nextpr)
438			(void)printf(" {%s}", pr->fmt);
439		(void)printf("\n");
440	}
441#endif
442}
443
444void
445escape(char *p1)
446{
447	char *p2;
448
449	/* alphabetic escape sequences have to be done in place */
450	for (p2 = p1;; p1++, p2++) {
451		if (*p1 == '\\') {
452			p1++;
453			switch(*p1) {
454			case '\0':
455				*p2 = '\\';
456				*++p2 = '\0';
457				return;
458			case 'a':
459			     /* *p2 = '\a'; */
460				*p2 = '\007';
461				break;
462			case 'b':
463				*p2 = '\b';
464				break;
465			case 'f':
466				*p2 = '\f';
467				break;
468			case 'n':
469				*p2 = '\n';
470				break;
471			case 'r':
472				*p2 = '\r';
473				break;
474			case 't':
475				*p2 = '\t';
476				break;
477			case 'v':
478				*p2 = '\v';
479				break;
480			default:
481				*p2 = *p1;
482				break;
483			}
484		} else {
485			*p2 = *p1;
486			if (*p1 == '\0')
487				return;
488		}
489	}
490}
491
492void
493badcnt(const char *s)
494{
495	errx(1, "%s: bad byte count", s);
496}
497
498void
499badsfmt(void)
500{
501	errx(1, "%%s: requires a precision or a byte count");
502}
503
504void
505badfmt(const char *fmt)
506{
507	errx(1, "\"%s\": bad format", fmt);
508}
509
510void
511badconv(const char *ch)
512{
513	errx(1, "%%%s: bad conversion character", ch);
514}
515