1/*-
2 * Copyright (c) 1991, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Keith Muller of the University of California, San Diego and Lance
7 * Visser of Convex Computer Corporation.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35#if 0
36static char sccsid[] = "@(#)conv.c	8.3 (Berkeley) 4/2/94";
37#endif
38#endif /* not lint */
39#include <sys/cdefs.h>
40__FBSDID("$FreeBSD$");
41
42#include <sys/param.h>
43
44#include <err.h>
45#include <inttypes.h>
46#include <string.h>
47
48#include "dd.h"
49#include "extern.h"
50
51/*
52 * def --
53 * Copy input to output.  Input is buffered until reaches obs, and then
54 * output until less than obs remains.  Only a single buffer is used.
55 * Worst case buffer calculation is (ibs + obs - 1).
56 */
57void
58def(void)
59{
60	u_char *inp;
61	const u_char *t;
62	size_t cnt;
63
64	if ((t = ctab) != NULL)
65		for (inp = in.dbp - (cnt = in.dbrcnt); cnt--; ++inp)
66			*inp = t[*inp];
67
68	/* Make the output buffer look right. */
69	out.dbp = in.dbp;
70	out.dbcnt = in.dbcnt;
71
72	if (in.dbcnt >= out.dbsz) {
73		/* If the output buffer is full, write it. */
74		dd_out(0);
75
76		/*
77		 * Ddout copies the leftover output to the beginning of
78		 * the buffer and resets the output buffer.  Reset the
79		 * input buffer to match it.
80	 	 */
81		in.dbp = out.dbp;
82		in.dbcnt = out.dbcnt;
83	}
84}
85
86void
87def_close(void)
88{
89	/* Just update the count, everything is already in the buffer. */
90	if (in.dbcnt)
91		out.dbcnt = in.dbcnt;
92}
93
94/*
95 * Copy variable length newline terminated records with a max size cbsz
96 * bytes to output.  Records less than cbs are padded with spaces.
97 *
98 * max in buffer:  MAX(ibs, cbsz)
99 * max out buffer: obs + cbsz
100 */
101void
102block(void)
103{
104	u_char *inp, *outp;
105	const u_char *t;
106	size_t cnt, maxlen;
107	static int intrunc;
108	int ch;
109
110	/*
111	 * Record truncation can cross block boundaries.  If currently in a
112	 * truncation state, keep tossing characters until reach a newline.
113	 * Start at the beginning of the buffer, as the input buffer is always
114	 * left empty.
115	 */
116	if (intrunc) {
117		for (inp = in.db, cnt = in.dbrcnt; cnt && *inp++ != '\n'; --cnt)
118			;
119		if (!cnt) {
120			in.dbcnt = 0;
121			in.dbp = in.db;
122			return;
123		}
124		intrunc = 0;
125		/* Adjust the input buffer numbers. */
126		in.dbcnt = cnt - 1;
127		in.dbp = inp + cnt - 1;
128	}
129
130	/*
131	 * Copy records (max cbsz size chunks) into the output buffer.  The
132	 * translation is done as we copy into the output buffer.
133	 */
134	ch = 0;
135	for (inp = in.dbp - in.dbcnt, outp = out.dbp; in.dbcnt;) {
136		maxlen = MIN(cbsz, in.dbcnt);
137		if ((t = ctab) != NULL)
138			for (cnt = 0; cnt < maxlen && (ch = *inp++) != '\n';
139			    ++cnt)
140				*outp++ = t[ch];
141		else
142			for (cnt = 0; cnt < maxlen && (ch = *inp++) != '\n';
143			    ++cnt)
144				*outp++ = ch;
145		/*
146		 * Check for short record without a newline.  Reassemble the
147		 * input block.
148		 */
149		if (ch != '\n' && in.dbcnt < cbsz) {
150			(void)memmove(in.db, in.dbp - in.dbcnt, in.dbcnt);
151			break;
152		}
153
154		/* Adjust the input buffer numbers. */
155		in.dbcnt -= cnt;
156		if (ch == '\n')
157			--in.dbcnt;
158
159		/* Pad short records with spaces. */
160		if (cnt < cbsz)
161			(void)memset(outp, ctab ? ctab[' '] : ' ', cbsz - cnt);
162		else {
163			/*
164			 * If the next character wouldn't have ended the
165			 * block, it's a truncation.
166			 */
167			if (!in.dbcnt || *inp != '\n')
168				++st.trunc;
169
170			/* Toss characters to a newline. */
171			for (; in.dbcnt && *inp++ != '\n'; --in.dbcnt)
172				;
173			if (!in.dbcnt)
174				intrunc = 1;
175			else
176				--in.dbcnt;
177		}
178
179		/* Adjust output buffer numbers. */
180		out.dbp += cbsz;
181		if ((out.dbcnt += cbsz) >= out.dbsz)
182			dd_out(0);
183		outp = out.dbp;
184	}
185	in.dbp = in.db + in.dbcnt;
186}
187
188void
189block_close(void)
190{
191	/*
192	 * Copy any remaining data into the output buffer and pad to a record.
193	 * Don't worry about truncation or translation, the input buffer is
194	 * always empty when truncating, and no characters have been added for
195	 * translation.  The bottom line is that anything left in the input
196	 * buffer is a truncated record.  Anything left in the output buffer
197	 * just wasn't big enough.
198	 */
199	if (in.dbcnt) {
200		++st.trunc;
201		(void)memmove(out.dbp, in.dbp - in.dbcnt, in.dbcnt);
202		(void)memset(out.dbp + in.dbcnt, ctab ? ctab[' '] : ' ',
203		    cbsz - in.dbcnt);
204		out.dbcnt += cbsz;
205	}
206}
207
208/*
209 * Convert fixed length (cbsz) records to variable length.  Deletes any
210 * trailing blanks and appends a newline.
211 *
212 * max in buffer:  MAX(ibs, cbsz) + cbsz
213 * max out buffer: obs + cbsz
214 */
215void
216unblock(void)
217{
218	u_char *inp;
219	const u_char *t;
220	size_t cnt;
221
222	/* Translation and case conversion. */
223	if ((t = ctab) != NULL)
224		for (inp = in.dbp - (cnt = in.dbrcnt); cnt--; ++inp)
225			*inp = t[*inp];
226	/*
227	 * Copy records (max cbsz size chunks) into the output buffer.  The
228	 * translation has to already be done or we might not recognize the
229	 * spaces.
230	 */
231	for (inp = in.db; in.dbcnt >= cbsz; inp += cbsz, in.dbcnt -= cbsz) {
232		for (t = inp + cbsz - 1; t >= inp && *t == ' '; --t)
233			;
234		if (t >= inp) {
235			cnt = t - inp + 1;
236			(void)memmove(out.dbp, inp, cnt);
237			out.dbp += cnt;
238			out.dbcnt += cnt;
239		}
240		*out.dbp++ = '\n';
241		if (++out.dbcnt >= out.dbsz)
242			dd_out(0);
243	}
244	if (in.dbcnt)
245		(void)memmove(in.db, in.dbp - in.dbcnt, in.dbcnt);
246	in.dbp = in.db + in.dbcnt;
247}
248
249void
250unblock_close(void)
251{
252	u_char *t;
253	size_t cnt;
254
255	if (in.dbcnt) {
256		warnx("%s: short input record", in.name);
257		for (t = in.db + in.dbcnt - 1; t >= in.db && *t == ' '; --t)
258			;
259		if (t >= in.db) {
260			cnt = t - in.db + 1;
261			(void)memmove(out.dbp, in.db, cnt);
262			out.dbp += cnt;
263			out.dbcnt += cnt;
264		}
265		++out.dbcnt;
266		*out.dbp++ = '\n';
267	}
268}
269