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/*

 * Copyright (c) 1993 by David I. Bell

 * Permission is granted to use, distribute, or modify this source,

 * provided that this copyright notice remains intact.

 *

 * Most simple built-in commands are here.

 */

#include "sash.h"

#include <sys/types.h>

#include <sys/stat.h>

#include <unistd.h>

#include <fcntl.h>

#include <signal.h>

#include <pwd.h>

#include <grp.h>

#include <utime.h>

#include <errno.h>

void

do_hexdump(argc, argv)

        int     argc;

        char    **argv;

{

        FILE    *fp;

        int     count;

        int     c;

        char    text[17];

        unsigned char   buf[130];

        char    *name = 0;

        unsigned long pos = 0;

        char    *myname = argv[0];

        if ( (argc > 2) && !strcmp(argv[1],"-s") ) {

                pos = strtoul(argv[2], 0, 0);

                argc -= 2;

                argv += 2;

        }

        if ( argc > 0 )

                name = argv[1];

        fp = fopen(name, "r");

        fseek(fp, pos, SEEK_SET);

        c = 0;

        text[16] = 0;

        while(!feof(fp)) {

          strcmp(text, "                ");

          while (c < (pos & 0xf)) {

            if (c == 0)

              printf("%4X:", pos & 0xfffffff0);

            printf( (c == 8) ? "-  " : "   ");

            text[c] = ' ';

            c++;

          }

          {

            int p = 0;

            count = fread(buf, 1, 128 - (pos % 16), fp);

            if (count <= 0)

              break;

            while (p < count) {

              c = (pos & 0xf);

              if (c == 0)

                printf("%4X:", pos & 0xfffffff0);

              if ((buf[p] < 32) || (buf[p]>126))

                text[c] = '.';

              else

                text[c] = buf[p];

              printf( (c==15) ? " %02.2X" : (c == 8) ? "-%02.2X" : " %02.2X", buf[p]);

              if (c == 15)

                printf(" %s\n", text);

              pos++;

              p++;

            }

          }

          if (c = (pos & 0x0f)) {

            while (c < 16) {

              printf( (c == 8) ? "-  " : "   ");

              text[c] = ' ';

              c++;

            }

            printf(" %s\n", text);

          }

          if (feof(fp))

            break;

          printf("--more--");

          fflush(stdout);

          fgets(buf, 80, stdin);

          if (toupper(buf[0]) == 'Q')

            break;

        }

}