source: MondoRescue/branches/3.0/mindi-busybox/coreutils/od.c@ 2899

/* vi: set sw=4 ts=4: */
/*
 * od implementation for busybox
 * Based on code from util-linux v 2.11l
 *
 * Copyright (c) 1990
 * The Regents of the University of California.  All rights reserved.
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 *
 * Original copyright notice is retained at the end of this file.
 */


#include "libbb.h"
#if ENABLE_DESKTOP
/* This one provides -t (busybox's own build script needs it) */
#include "od_bloaty.c"
#else

#include "dump.h"

static void
odoffset(dumper_t *dumper, int argc, char ***argvp)
{
    char *num, *p;
    int base;
    char *end;

    /*
     * The offset syntax of od(1) was genuinely bizarre.  First, if
     * it started with a plus it had to be an offset.  Otherwise, if
     * there were at least two arguments, a number or lower-case 'x'
     * followed by a number makes it an offset.  By default it was
     * octal; if it started with 'x' or '0x' it was hex.  If it ended
     * in a '.', it was decimal.  If a 'b' or 'B' was appended, it
     * multiplied the number by 512 or 1024 byte units.  There was
     * no way to assign a block count to a hex offset.
     *
     * We assumes it's a file if the offset is bad.
     */
    p = **argvp;

    if (!p) {
        /* hey someone is probably piping to us ... */
        return;
    }

    if ((*p != '+')
        && (argc < 2
            || (!isdigit(p[0])
                && ((p[0] != 'x') || !isxdigit(p[1])))))
        return;

    base = 0;
    /*
     * skip over leading '+', 'x[0-9a-fA-f]' or '0x', and
     * set base.
     */
    if (p[0] == '+')
        ++p;
    if (p[0] == 'x' && isxdigit(p[1])) {
        ++p;
        base = 16;
    } else if (p[0] == '0' && p[1] == 'x') {
        p += 2;
        base = 16;
    }

    /* skip over the number */
    if (base == 16)
        for (num = p; isxdigit(*p); ++p)
            continue;
    else
        for (num = p; isdigit(*p); ++p)
            continue;

    /* check for no number */
    if (num == p)
        return;

    /* if terminates with a '.', base is decimal */
    if (*p == '.') {
        if (base)
            return;
        base = 10;
    }

    dumper->dump_skip = strtol(num, &end, base ? base : 8);

    /* if end isn't the same as p, we got a non-octal digit */
    if (end != p)
        dumper->dump_skip = 0;
    else {
        if (*p) {
            if (*p == 'b') {
                dumper->dump_skip *= 512;
                ++p;
            } else if (*p == 'B') {
                dumper->dump_skip *= 1024;
                ++p;
            }
        }
        if (*p)
            dumper->dump_skip = 0;
        else {
            ++*argvp;
            /*
             * If the offset uses a non-octal base, the base of
             * the offset is changed as well.  This isn't pretty,
             * but it's easy.
             */
#define TYPE_OFFSET 7
            {
                char x_or_d;
                if (base == 16) {
                    x_or_d = 'x';
                    goto DO_X_OR_D;
                }
                if (base == 10) {
                    x_or_d = 'd';
 DO_X_OR_D:
                    dumper->fshead->nextfu->fmt[TYPE_OFFSET]
                        = dumper->fshead->nextfs->nextfu->fmt[TYPE_OFFSET]
                        = x_or_d;
                }
            }
        }
    }
}

static const char *const add_strings[] = {
    "16/1 \"%3_u \" \"\\n\"",              /* a */
    "8/2 \" %06o \" \"\\n\"",              /* B, o */
    "16/1 \"%03o \" \"\\n\"",              /* b */
    "16/1 \"%3_c \" \"\\n\"",              /* c */
    "8/2 \"  %05u \" \"\\n\"",             /* d */
    "4/4 \"     %010u \" \"\\n\"",         /* D */
    "2/8 \"          %21.14e \" \"\\n\"",  /* e (undocumented in od), F */
    "4/4 \" %14.7e \" \"\\n\"",            /* f */
    "4/4 \"       %08x \" \"\\n\"",        /* H, X */
    "8/2 \"   %04x \" \"\\n\"",            /* h, x */
    "4/4 \"    %11d \" \"\\n\"",           /* I, L, l */
    "8/2 \" %6d \" \"\\n\"",               /* i */
    "4/4 \"    %011o \" \"\\n\"",          /* O */
};

static const char od_opts[] ALIGN1 = "aBbcDdeFfHhIiLlOoXxv";

static const char od_o2si[] ALIGN1 = {
    0, 1, 2, 3, 5,
    4, 6, 6, 7, 8,
    9, 0xa, 0xb, 0xa, 0xa,
    0xb, 1, 8, 9,
};

int od_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int od_main(int argc, char **argv)
{
    int ch;
    int first = 1;
    char *p;
    dumper_t *dumper = alloc_dumper();

    while ((ch = getopt(argc, argv, od_opts)) > 0) {
        if (ch == 'v') {
            dumper->dump_vflag = ALL;
        } else if (((p = strchr(od_opts, ch)) != NULL) && (*p != '\0')) {
            if (first) {
                first = 0;
                bb_dump_add(dumper, "\"%07.7_Ao\n\"");
                bb_dump_add(dumper, "\"%07.7_ao  \"");
            } else {
                bb_dump_add(dumper, "\"         \"");
            }
            bb_dump_add(dumper, add_strings[(int)od_o2si[(p - od_opts)]]);
        } else {  /* P, p, s, w, or other unhandled */
            bb_show_usage();
        }
    }
    if (!dumper->fshead) {
        bb_dump_add(dumper, "\"%07.7_Ao\n\"");
        bb_dump_add(dumper, "\"%07.7_ao  \" 8/2 \"%06o \" \"\\n\"");
    }

    argc -= optind;
    argv += optind;

    odoffset(dumper, argc, &argv);

    return bb_dump_dump(dumper, argv);
}
#endif /* ENABLE_DESKTOP */

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * 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.
 */