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/* $OpenBSD: conv.c,v 1.13 2016/08/16 16:44:55 krw Exp $ */
/* $NetBSD: conv.c,v 1.6 1996/02/20 19:29:02 jtc Exp $ */
/*-
* Copyright (c) 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Keith Muller of the University of California, San Diego and Lance
* Visser of Convex Computer Corporation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/time.h>
#include <err.h>
#include <string.h>
#include "dd.h"
#include "extern.h"
#define MINIMUM(a, b) (((a) < (b)) ? (a) : (b))
/*
* def --
* Copy input to output. Input is buffered until reaches obs, and then
* output until less than obs remains. Only a single buffer is used.
* Worst case buffer calculation is (ibs + obs - 1).
*/
void
def(void)
{
size_t cnt;
u_char *inp;
const u_char *t;
if ((t = ctab) != NULL)
for (inp = in.dbp - (cnt = in.dbrcnt); cnt--; ++inp)
*inp = t[*inp];
/* Make the output buffer look right. */
out.dbp = in.dbp;
out.dbcnt = in.dbcnt;
if (in.dbcnt >= out.dbsz) {
/* If the output buffer is full, write it. */
dd_out(0);
/*
* Ddout copies the leftover output to the beginning of
* the buffer and resets the output buffer. Reset the
* input buffer to match it.
*/
in.dbp = out.dbp;
in.dbcnt = out.dbcnt;
}
}
void
def_close(void)
{
/* Just update the count, everything is already in the buffer. */
if (in.dbcnt)
out.dbcnt = in.dbcnt;
}
#ifdef NO_CONV
/* Build a smaller version (i.e. for a miniroot) */
/* These can not be called, but just in case... */
static char no_block[] = "unblock and -DNO_CONV?";
void block() { errx(1, "%s", no_block + 2); }
void block_close() { errx(1, "%s", no_block + 2); }
void unblock() { errx(1, "%s", no_block); }
void unblock_close() { errx(1, "%s", no_block); }
#else /* NO_CONV */
/*
* Copy variable length newline terminated records with a max size cbsz
* bytes to output. Records less than cbs are padded with spaces.
*
* max in buffer: MAX(ibs, cbsz)
* max out buffer: obs + cbsz
*/
void
block(void)
{
static int intrunc;
int ch = -1;
size_t cnt, maxlen;
u_char *inp, *outp;
const u_char *t;
/*
* Record truncation can cross block boundaries. If currently in a
* truncation state, keep tossing characters until reach a newline.
* Start at the beginning of the buffer, as the input buffer is always
* left empty.
*/
if (intrunc) {
for (inp = in.db, cnt = in.dbrcnt;
cnt && *inp++ != '\n'; --cnt);
if (!cnt) {
in.dbcnt = 0;
in.dbp = in.db;
return;
}
intrunc = 0;
/* Adjust the input buffer numbers. */
in.dbcnt = cnt - 1;
in.dbp = inp + cnt - 1;
}
/*
* Copy records (max cbsz size chunks) into the output buffer. The
* translation is done as we copy into the output buffer.
*/
for (inp = in.dbp - in.dbcnt, outp = out.dbp; in.dbcnt;) {
maxlen = MINIMUM(cbsz, in.dbcnt);
if ((t = ctab) != NULL)
for (cnt = 0;
cnt < maxlen && (ch = *inp++) != '\n'; ++cnt)
*outp++ = t[ch];
else
for (cnt = 0;
cnt < maxlen && (ch = *inp++) != '\n'; ++cnt)
*outp++ = ch;
/*
* Check for short record without a newline. Reassemble the
* input block.
*/
if (ch != '\n' && in.dbcnt < cbsz) {
(void)memmove(in.db, in.dbp - in.dbcnt, in.dbcnt);
break;
}
/* Adjust the input buffer numbers. */
in.dbcnt -= cnt;
if (ch == '\n')
--in.dbcnt;
/* Pad short records with spaces. */
if (cnt < cbsz)
(void)memset(outp, ctab ? ctab[' '] : ' ', cbsz - cnt);
else {
/*
* If the next character wouldn't have ended the
* block, it's a truncation.
*/
if (!in.dbcnt || *inp != '\n')
++st.trunc;
/* Toss characters to a newline. */
for (; in.dbcnt && *inp++ != '\n'; --in.dbcnt);
if (!in.dbcnt)
intrunc = 1;
else
--in.dbcnt;
}
/* Adjust output buffer numbers. */
out.dbp += cbsz;
if ((out.dbcnt += cbsz) >= out.dbsz)
dd_out(0);
outp = out.dbp;
}
in.dbp = in.db + in.dbcnt;
}
void
block_close(void)
{
/*
* Copy any remaining data into the output buffer and pad to a record.
* Don't worry about truncation or translation, the input buffer is
* always empty when truncating, and no characters have been added for
* translation. The bottom line is that anything left in the input
* buffer is a truncated record. Anything left in the output buffer
* just wasn't big enough.
*/
if (in.dbcnt) {
++st.trunc;
(void)memmove(out.dbp, in.dbp - in.dbcnt, in.dbcnt);
(void)memset(out.dbp + in.dbcnt,
ctab ? ctab[' '] : ' ', cbsz - in.dbcnt);
out.dbcnt += cbsz;
}
}
/*
* Convert fixed length (cbsz) records to variable length. Deletes any
* trailing blanks and appends a newline.
*
* max in buffer: MAX(ibs, cbsz) + cbsz
* max out buffer: obs + cbsz
*/
void
unblock(void)
{
size_t cnt;
u_char *inp;
const u_char *t;
/* Translation and case conversion. */
if ((t = ctab) != NULL)
for (cnt = in.dbrcnt, inp = in.dbp - 1; cnt--; inp--)
*inp = t[*inp];
/*
* Copy records (max cbsz size chunks) into the output buffer. The
* translation has to already be done or we might not recognize the
* spaces.
*/
for (inp = in.db; in.dbcnt >= cbsz; inp += cbsz, in.dbcnt -= cbsz) {
for (t = inp + cbsz - 1; t >= inp && *t == ' '; --t);
if (t >= inp) {
cnt = t - inp + 1;
(void)memmove(out.dbp, inp, cnt);
out.dbp += cnt;
out.dbcnt += cnt;
}
++out.dbcnt;
*out.dbp++ = '\n';
if (out.dbcnt >= out.dbsz)
dd_out(0);
}
if (in.dbcnt)
(void)memmove(in.db, in.dbp - in.dbcnt, in.dbcnt);
in.dbp = in.db + in.dbcnt;
}
void
unblock_close(void)
{
size_t cnt;
u_char *t;
if (in.dbcnt) {
warnx("%s: short input record", in.name);
for (t = in.db + in.dbcnt - 1; t >= in.db && *t == ' '; --t);
if (t >= in.db) {
cnt = t - in.db + 1;
(void)memmove(out.dbp, in.db, cnt);
out.dbp += cnt;
out.dbcnt += cnt;
}
++out.dbcnt;
*out.dbp++ = '\n';
}
}
#endif /* NO_CONV */
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