source: rtems/cpukit/libmisc/shell/dd-conv.c @ e4a3d93

/*-
 * 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.
 * 4. 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.
 */

#ifndef lint
#if 0
static char sccsid[] = "@(#)conv.c      8.3 (Berkeley) 4/2/94";
#endif
#endif /* not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/bin/dd/conv.c,v 1.19 2004/04/06 20:06:45 markm Exp $");

#include <sys/param.h>

#include <err.h>
#include <inttypes.h>
#include <string.h>

#include "dd.h"
#include "extern-dd.h"

/*
 * 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(rtems_shell_dd_globals* globals)
{
        u_char *inp;
        const u_char *t;
        size_t cnt;

        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(globals, 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(rtems_shell_dd_globals* globals)
{
        /* Just update the count, everything is already in the buffer. */
        if (in.dbcnt)
                out.dbcnt = in.dbcnt;
}

/*
 * 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(rtems_shell_dd_globals* globals)
{
        u_char *inp, *outp;
        const u_char *t;
        size_t cnt, maxlen;
        static int intrunc;
        int ch;

        /*
         * 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.
         */
        ch = 0;
        for (inp = in.dbp - in.dbcnt, outp = out.dbp; in.dbcnt;) {
                maxlen = MIN(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(globals, 0);
                outp = out.dbp;
        }
        in.dbp = in.db + in.dbcnt;
}

void
block_close(rtems_shell_dd_globals* globals)
{
        /*
         * 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(rtems_shell_dd_globals* globals)
{
        u_char *inp;
        const u_char *t;
        size_t cnt;

        /* Translation and case conversion. */
        if ((t = ctab) != NULL)
                for (inp = in.dbp - (cnt = in.dbrcnt); 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.dbp++ = '\n';
                if (++out.dbcnt >= out.dbsz)
                        dd_out(globals, 0);
        }
        if (in.dbcnt)
                (void)memmove(in.db, in.dbp - in.dbcnt, in.dbcnt);
        in.dbp = in.db + in.dbcnt;
}

void
unblock_close(rtems_shell_dd_globals* globals)
{
        u_char *t;
        size_t cnt;

        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';
        }
}