/*      $OpenBSD: odsyntax.c,v 1.28 2017/05/30 05:58:44 tedu Exp $      */
/*      $NetBSD: odsyntax.c,v 1.15 2001/12/07 15:14:29 bjh21 Exp $      */

/*-
 * Copyright (c) 1990, 1993
 *      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.
 */

#include <sys/types.h>

#include <ctype.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "hexdump.h"

#define PADDING "         "

int odmode;

static void              odadd(const char *);
static void              odoffset(int, char ***);
static __dead void       oldusage(void);
static void              posixtypes(char *);

/*
 * formats used for -t
 */
static const char *fmt[4][4] = {
        {
                "16/1 \"%3d \" \"\\n\"",
                "8/2  \"  %05d \" \"\\n\"",
                "4/4  \"     %010d \" \"\\n\"",
                "2/8  \" %019d \" \"\\n\""
        }, {
                "16/1 \"%03o \" \"\\n\"",
                "8/2  \" %06o \" \"\\n\"",
                "4/4  \"    %011o\" \"\\n\"",
                "2/8  \" %022o \" \"\\n\""
        }, {
                "16/1 \"%03u \" \"\\n\"",
                "8/2  \"  %05u \" \"\\n\"",
                "4/4  \"     %010u \" \"\\n\"",
                "2/8  \" %020u \" \"\\n\""
        }, {
                "16/1 \" %02x \" \"\\n\"",
                "8/2  \"   %04x \" \"\\n\"",
                "4/4  \"       %08x \" \"\\n\"",
                "2/8  \" %16x \" \"\\n\""
        }
};

void
oldsyntax(int argc, char ***argvp)
{
        static char empty[] = "", padding[] = PADDING;
        int ch;
        char *p, **argv;

#define TYPE_OFFSET     7
        add("\"%07.7_Ao\n\"");
        add("\"%07.7_ao  \"");

        odmode = 1;
        argv = *argvp;
        while ((ch = getopt(argc, argv,
            "A:aBbcDdeFfHhIij:LlN:Oost:vXx")) != -1)
                switch (ch) {
                case 'A':
                        switch (*optarg) {
                        case 'd': case 'o': case 'x':
                                fshead->nextfu->fmt[TYPE_OFFSET] = *optarg;
                                fshead->nextfs->nextfu->fmt[TYPE_OFFSET] =
                                    *optarg;
                                break;
                        case 'n':
                                fshead->nextfu->fmt = empty;
                                fshead->nextfs->nextfu->fmt = padding;
                                break;
                        default:
                                errx(1, "%s: invalid address base", optarg);
                        }
                        break;
                case 'a':
                        odadd("16/1 \"%3_u \" \"\\n\"");
                        break;
                case 'B':
                case 'o':
                        odadd("8/2 \" %06o \" \"\\n\"");
                        break;
                case 'b':
                        odadd("16/1 \"%03o \" \"\\n\"");
                        break;
                case 'c':
                        odadd("16/1 \"%3_c \" \"\\n\"");
                        break;
                case 'd':
                        odadd("8/2 \"  %05u \" \"\\n\"");
                        break;
                case 'D':
                        odadd("4/4 \"     %010u \" \"\\n\"");
                        break;
                case 'e':
                case 'F':
                        odadd("2/8 \"          %21.14e \" \"\\n\"");
                        break;
                case 'f':
                        odadd("4/4 \" %14.7e \" \"\\n\"");
                        break;
                case 'H':
                case 'X':
                        odadd("4/4 \"       %08x \" \"\\n\"");
                        break;
                case 'h':
                case 'x':
                        odadd("8/2 \"   %04x \" \"\\n\"");
                        break;
                case 'I':
                case 'L':
                case 'l':
                        odadd("4/4 \"    %11d \" \"\\n\"");
                        break;
                case 'i':
                        odadd("8/2 \" %6d \" \"\\n\"");
                        break;
                case 'j':
                        if ((skip = strtol(optarg, &p, 0)) < 0)
                                errx(1, "%s: bad skip value", optarg);
                        switch(*p) {
                        case 'b':
                                skip *= 512;
                                break;
                        case 'k':
                                skip *= 1024;
                                break;
                        case 'm':
                                skip *= 1048576;
                                break;
                        }
                        break;
                case 'N':
                        if ((length = atoi(optarg)) < 0)
                                errx(1, "%s: bad length value", optarg);
                        break;
                case 'O':
                        odadd("4/4 \"    %011o \" \"\\n\"");
                        break;
                case 's':
                        odadd("8/2 \"  %05d \" \"\\n\"");
                        break;
                case 't':
                        posixtypes(optarg);
                        break;
                case 'v':
                        vflag = ALL;
                        break;
                default:
                        oldusage();
                }

        if (fshead->nextfs->nextfs == NULL)
                odadd(" 8/2 \"%06o \" \"\\n\"");

        argc -= optind;
        *argvp += optind;

        if (argc)
                odoffset(argc, argvp);
}

/*
 * Interpret a POSIX-style -t argument.
 */
static void
posixtypes(char *type_string)
{
        int x, y, nbytes;

        while (*type_string) {
                switch (*type_string) {
                case 'a':
                        type_string++;
                        odadd("16/1 \"%3_u \" \"\\n\"");
                        break;
                case 'c':
                        type_string++;
                        odadd("16/1 \"%3_c \" \"\\n\"");
                        break;
                case 'f':
                        type_string++;
                        if        (*type_string == 'F' ||
                                   *type_string == '4') {
                                type_string++;
                                odadd("4/4 \" %14.7e\" \"\\n\"");
                        } else if (*type_string == 'L' ||
                                   *type_string == '8') {
                                type_string++;
                                odadd("2/8 \" %16.14e\" \"\\n\"");
                        } else if (*type_string == 'D')
                                /* long doubles vary in size */
                                oldusage();
                        else
                                odadd("2/8 \" %16.14e\" \"\\n\"");
                        break;
                case 'd':
                        x = 0;
                        goto extensions;
                case 'o':
                        x = 1;
                        goto extensions;
                case 'u':
                        x = 2;
                        goto extensions;
                case 'x':
                        x = 3;
                extensions:
                        type_string++;
                        y = 2;
                        if (isupper((unsigned char)*type_string)) {
                                switch(*type_string) {
                                case 'C':
                                        nbytes = sizeof(char);
                                        break;
                                case 'S':
                                        nbytes = sizeof(short);
                                        break;
                                case 'I':
                                        nbytes = sizeof(int);
                                        break;
                                case 'L':
                                        nbytes = sizeof(long);
                                        break;
                                default:
                                        warnx("Bad type-size qualifier '%c'",
                                            *type_string);
                                        oldusage();
                                }
                                type_string++;
                        } else if (isdigit((unsigned char)*type_string))
                                nbytes = strtol(type_string, &type_string, 10);
                        else
                                nbytes = 4;

                        switch (nbytes) {
                        case 1:
                                y = 0;
                                break;
                        case 2:
                                y = 1;
                                break;
                        case 4:
                                y = 2;
                                break;
                        case 8:
                                y = 3;
                                break;
                        default:
                                warnx("%d-byte integer formats are not "
                                    "supported", nbytes);
                                oldusage();
                        }
                        odadd(fmt[x][y]);
                        break;
                default:
                        oldusage();
                }
        }
}

static __dead void
oldusage(void)
{
        extern char *__progname;
        fprintf(stderr, "usage: %s [-aBbcDdeFfHhIiLlOosvXx] [-A base] "
            "[-j offset] [-N length]\n"
            "\t[-t type_string] [file ...]\n", __progname);
        exit(1);
}

static void
odoffset(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 assume it's a file if the offset is bad.
         */
        p = argc == 1 ? (*argvp)[0] : (*argvp)[1];
        if (!p)
                return;

        if (*p != '+' && (argc < 2 ||
            (!isdigit((unsigned char)p[0]) &&
            (p[0] != 'x' || !isxdigit((unsigned char)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((unsigned char)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((unsigned char)*p); ++p);
        else
                for (num = p; isdigit((unsigned char)*p); ++p);

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

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

        skip = strtol(num, &end, base ? base : 8);

        /* if end isn't the same as p, we got a non-octal digit */
        if (end != p) {
                skip = 0;
                return;
        }

        if (*p == '.')
                ++p;
        if (*p) {
                if (*p == 'B') {
                        skip *= 1024;
                        ++p;
                } else if (*p == 'b') {
                        skip *= 512;
                        ++p;
                }
        }
        if (*p) {
                skip = 0;
                return;
        }
        /*
         * 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.
         */
        if (base == 16) {
                fshead->nextfu->fmt[TYPE_OFFSET] = 'x';
                fshead->nextfs->nextfu->fmt[TYPE_OFFSET] = 'x';
        } else if (base == 10) {
                fshead->nextfu->fmt[TYPE_OFFSET] = 'd';
                fshead->nextfs->nextfu->fmt[TYPE_OFFSET] = 'd';
        }

        /* Terminate file list. */
        (*argvp)[argc > 1] = NULL;
}

static void
odadd(const char *format)
{
        static int needpad;

        if (needpad)
                add("\""PADDING"\"");
        add(format);
        needpad = 1;
}