source: MondoRescue/branches/3.2/mindi-busybox/util-linux/hexdump.c

/* vi: set sw=4 ts=4: */
/*
 * hexdump implementation for busybox
 * Based on code from util-linux v 2.11l
 *
 * Copyright (c) 1989
 * The Regents of the University of California.  All rights reserved.
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 */

//usage:#define hexdump_trivial_usage
//usage:       "[-bcCdefnosvx" IF_FEATURE_HEXDUMP_REVERSE("R") "] [FILE]..."
//usage:#define hexdump_full_usage "\n\n"
//usage:       "Display FILEs (or stdin) in a user specified format\n"
//usage:     "\n    -b      One-byte octal display"
//usage:     "\n    -c      One-byte character display"
//usage:     "\n    -C      Canonical hex+ASCII, 16 bytes per line"
//usage:     "\n    -d      Two-byte decimal display"
//usage:     "\n    -e FORMAT_STRING"
//usage:     "\n    -f FORMAT_FILE"
//usage:     "\n    -n LENGTH   Interpret only LENGTH bytes of input"
//usage:     "\n    -o      Two-byte octal display"
//usage:     "\n    -s OFFSET   Skip OFFSET bytes"
//usage:     "\n    -v      Display all input data"
//usage:     "\n    -x      Two-byte hexadecimal display"
//usage:    IF_FEATURE_HEXDUMP_REVERSE(
//usage:     "\n    -R      Reverse of 'hexdump -Cv'")
//usage:
//usage:#define hd_trivial_usage
//usage:       "FILE..."
//usage:#define hd_full_usage "\n\n"
//usage:       "hd is an alias for hexdump -C"

#include "libbb.h"
#include "dump.h"

/* This is a NOEXEC applet. Be very careful! */

static void bb_dump_addfile(dumper_t *dumper, char *name)
{
    char *p;
    FILE *fp;
    char *buf;

    fp = xfopen_for_read(name);
    while ((buf = xmalloc_fgetline(fp)) != NULL) {
        p = skip_whitespace(buf);
        if (*p && (*p != '#')) {
            bb_dump_add(dumper, p);
        }
        free(buf);
    }
    fclose(fp);
}

static const char *const add_strings[] = {
    "\"%07.7_ax \" 16/1 \"%03o \" \"\\n\"",   /* b */
    "\"%07.7_ax \" 16/1 \"%3_c \" \"\\n\"",   /* c */
    "\"%07.7_ax \" 8/2 \"  %05u \" \"\\n\"",  /* d */
    "\"%07.7_ax \" 8/2 \" %06o \" \"\\n\"",   /* o */
    "\"%07.7_ax \" 8/2 \"   %04x \" \"\\n\"", /* x */
};

static const char add_first[] ALIGN1 = "\"%07.7_Ax\n\"";

static const char hexdump_opts[] ALIGN1 = "bcdoxCe:f:n:s:v" IF_FEATURE_HEXDUMP_REVERSE("R");

static const struct suffix_mult suffixes[] = {
    { "b", 512 },
    { "k", 1024 },
    { "m", 1024*1024 },
    { "", 0 }
};

int hexdump_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int hexdump_main(int argc, char **argv)
{
    dumper_t *dumper = alloc_dumper();
    const char *p;
    int ch;
#if ENABLE_FEATURE_HEXDUMP_REVERSE
    FILE *fp;
    smallint rdump = 0;
#endif

    if (ENABLE_HD && !applet_name[2]) { /* we are "hd" */
        ch = 'C';
        goto hd_applet;
    }

    /* We cannot use getopt32: in hexdump options are cumulative.
     * E.g. "hexdump -C -C file" should dump each line twice */
    while ((ch = getopt(argc, argv, hexdump_opts)) > 0) {
        p = strchr(hexdump_opts, ch);
        if (!p)
            bb_show_usage();
        if ((p - hexdump_opts) < 5) {
            bb_dump_add(dumper, add_first);
            bb_dump_add(dumper, add_strings[(int)(p - hexdump_opts)]);
        }
        /* Save a little bit of space below by omitting the 'else's. */
        if (ch == 'C') {
 hd_applet:
            bb_dump_add(dumper, "\"%08.8_Ax\n\"");
            bb_dump_add(dumper, "\"%08.8_ax  \" 8/1 \"%02x \" \"  \" 8/1 \"%02x \" ");
            bb_dump_add(dumper, "\"  |\" 16/1 \"%_p\" \"|\\n\"");
        }
        if (ch == 'e') {
            bb_dump_add(dumper, optarg);
        } /* else */
        if (ch == 'f') {
            bb_dump_addfile(dumper, optarg);
        } /* else */
        if (ch == 'n') {
            dumper->dump_length = xatoi_positive(optarg);
        } /* else */
        if (ch == 's') { /* compat: -s accepts hex numbers too */
            dumper->dump_skip = xstrtoul_range_sfx(optarg, /*base:*/ 0, /*lo:*/ 0, /*hi:*/ LONG_MAX, suffixes);
        } /* else */
        if (ch == 'v') {
            dumper->dump_vflag = ALL;
        }
#if ENABLE_FEATURE_HEXDUMP_REVERSE
        if (ch == 'R') {
            rdump = 1;
        }
#endif
    }

    if (!dumper->fshead) {
        bb_dump_add(dumper, add_first);
        bb_dump_add(dumper, "\"%07.7_ax \" 8/2 \"%04x \" \"\\n\"");
    }

    argv += optind;

#if !ENABLE_FEATURE_HEXDUMP_REVERSE
    return bb_dump_dump(dumper, argv);
#else
    if (!rdump) {
        return bb_dump_dump(dumper, argv);
    }

    /* -R: reverse of 'hexdump -Cv' */
    fp = stdin;
    if (!*argv) {
        argv--;
        goto jump_in;
    }

    do {
        char *buf;
        fp = xfopen_for_read(*argv);
 jump_in:
        while ((buf = xmalloc_fgetline(fp)) != NULL) {
            p = buf;
            while (1) {
                /* skip address or previous byte */
                while (isxdigit(*p)) p++;
                while (*p == ' ') p++;
                /* '|' char will break the line */
                if (!isxdigit(*p) || sscanf(p, "%x ", &ch) != 1)
                    break;
                putchar(ch);
            }
            free(buf);
        }
        fclose(fp);
    } while (*++argv);

    fflush_stdout_and_exit(EXIT_SUCCESS);
#endif
}