xxd.c

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	  if (nz < 0)
	    zero_seen--;
	  if (zero_seen == 2)
	    fputs(z, fp);
	  if (zero_seen > 2)
	    fputs("*\n", fp);
	}
      if (nz >= 0 || zero_seen > 0)
        fputs(l, fp);
      if (nz)
	zero_seen = 0;
    }
}

/* This is an EBCDIC to ASCII conversion table */
/* from a proposed BTL standard April 16, 1979 */
static unsigned char etoa64[] =
{
    0040,0240,0241,0242,0243,0244,0245,0246,
    0247,0250,0325,0056,0074,0050,0053,0174,
    0046,0251,0252,0253,0254,0255,0256,0257,
    0260,0261,0041,0044,0052,0051,0073,0176,
    0055,0057,0262,0263,0264,0265,0266,0267,
    0270,0271,0313,0054,0045,0137,0076,0077,
    0272,0273,0274,0275,0276,0277,0300,0301,
    0302,0140,0072,0043,0100,0047,0075,0042,
    0303,0141,0142,0143,0144,0145,0146,0147,
    0150,0151,0304,0305,0306,0307,0310,0311,
    0312,0152,0153,0154,0155,0156,0157,0160,
    0161,0162,0136,0314,0315,0316,0317,0320,
    0321,0345,0163,0164,0165,0166,0167,0170,
    0171,0172,0322,0323,0324,0133,0326,0327,
    0330,0331,0332,0333,0334,0335,0336,0337,
    0340,0341,0342,0343,0344,0135,0346,0347,
    0173,0101,0102,0103,0104,0105,0106,0107,
    0110,0111,0350,0351,0352,0353,0354,0355,
    0175,0112,0113,0114,0115,0116,0117,0120,
    0121,0122,0356,0357,0360,0361,0362,0363,
    0134,0237,0123,0124,0125,0126,0127,0130,
    0131,0132,0364,0365,0366,0367,0370,0371,
    0060,0061,0062,0063,0064,0065,0066,0067,
    0070,0071,0372,0373,0374,0375,0376,0377
};

int
main(argc, argv)
int argc;
char *argv[];
{
  FILE *fp, *fpo;
  int c, e, p = 0, relseek = 1, negseek = 0, revert = 0;
  int cols = 0, nonzero = 0, autoskip = 0, hextype = HEX_NORMAL;
  int ebcdic = 0;
  int octspergrp = 2;	/* number of octets grouped in output */
  int grplen;		/* total chars per octet group */
  long length = -1, n = 0, seekoff = 0;
  char l[LLEN+1];
  char *pname, *pp;

#ifdef AMIGA
  /* This program doesn't work when started from the Workbench */
  if (argc == 0)
    exit(1);
#endif

  pname = argv[0];
  for (pp = pname; *pp; )
    if (*pp++ == PATH_SEP)
      pname = pp;

  while (argc >= 2)
    {
      pp = argv[1] + (!STRNCMP(argv[1], "--", 2) && argv[1][2]);
           if (!STRNCMP(pp, "-a", 2)) autoskip = 1 - autoskip;
      else if (!STRNCMP(pp, "-u", 2)) hexx = hexxa + 16;
      else if (!STRNCMP(pp, "-p", 2)) hextype = HEX_POSTSCRIPT;
      else if (!STRNCMP(pp, "-i", 2)) hextype = HEX_CINCLUDE;
      else if (!STRNCMP(pp, "-r", 2)) revert++;
      else if (!STRNCMP(pp, "-E", 2)) ebcdic++;
      else if (!STRNCMP(pp, "-v", 2))
        {
	  fprintf(stderr, "%s%s\n", version, osver);
	  exit(0);
	}
      else if (!STRNCMP(pp, "-c", 2))
	{
	  if (pp[2] && STRNCMP("ols", pp + 2, 3))
	    cols = (int)strtol(pp + 2, NULL, 0);
	  else
	    {
	      if (!argv[2])
	        exit_with_usage(pname);
	      cols = (int)strtol(argv[2], NULL, 0);
	      argv++;
	      argc--;
	    }
	}
      else if (!STRNCMP(pp, "-g", 2))
        {
	  if (!argv[2])
	    exit_with_usage(pname);
	  octspergrp = (int)strtol(argv[2], NULL, 0);
	  argv++;
	  argc--;
	}
      else if (!STRNCMP(pp, "-s", 2))
	{
	  relseek = 0;
	  negseek = 0;
	  if (pp[2] && STRNCMP("kip", pp+2, 3) && STRNCMP("eek", pp+2, 3))
	    {
#ifdef TRY_SEEK
	      if (pp[2] == '+')
	        relseek++;
	      if (pp[2+relseek] == '-')
	        negseek++;
#endif
	      seekoff = strtol(pp + 2+relseek+negseek, (char **)NULL, 0);
	    }
	  else
	    {
	      if (!argv[2])
	        exit_with_usage(pname);
#ifdef TRY_SEEK
	      if (argv[2][0] == '+')
	        relseek++;
	      if (argv[2][relseek] == '-')
	        negseek++;
#endif
	      seekoff = strtol(argv[2] + relseek+negseek, (char **)NULL, 0);
	      argv++;
	      argc--;
	    }
	}
      else if (!STRNCMP(pp, "-l", 2))
	{
	  if (pp[2] && STRNCMP("en", pp + 2, 2))
	    length = strtol(pp + 2, (char **)NULL, 0);
	  else
	    {
	      if (!argv[2])
	        exit_with_usage(pname);
	      length = strtol(argv[2], (char **)NULL, 0);
	      argv++;
	      argc--;
	    }
	}
      else if (!strcmp(pp, "--"))	/* end of options */
        {
	  argv++;
	  argc--;
	  break;
	}
      else if (pp[0] == '-' && pp[1])	/* unknown option */
        exit_with_usage(pname);
      else
        break;				/* not an option */

      argv++;				/* advance to next argument */
      argc--;
    }

  if (!cols)
    switch (hextype)
      {
      case HEX_POSTSCRIPT:	cols = 30; break;
      case HEX_CINCLUDE:	cols = 12; break;
      case HEX_NORMAL:
      default:			cols = 16; break;
      }

  if (cols < 1 || (!hextype && (cols > COLS)))
    {
      fprintf(stderr, "%s: invalid number of columns (max. %d).\n", pname, COLS);
      exit(1);
    }

  if (octspergrp < 1)
    octspergrp = cols;

  if (argc > 3)
    exit_with_usage(pname);

  if (argc == 1 || (argv[1][0] == '-' && !argv[1][1]))
    BIN_ASSIGN(fp = stdin, !revert);
  else
    {
      if ((fp = fopen(argv[1], BIN_READ(!revert))) == NULL)
	{
	  fprintf(stderr,"%s: ", pname);
	  perror(argv[1]);
	  return 2;
	}
    }

  if (argc < 3 || (argv[2][0] == '-' && !argv[2][1]))
    BIN_ASSIGN(fpo = stdout, revert);
  else
    {
      int fd;

      if (((fd = OPEN(argv[2], O_WRONLY | BIN_CREAT(revert), 0666)) < 0) ||
          (fpo = fdopen(fd, BIN_WRITE(revert))) == NULL)
	{
	  fprintf(stderr, "%s: ", pname);
	  perror(argv[2]);
	  return 3;
	}
      rewind(fpo);
    }

  if (revert)
    {
      if (hextype && (hextype != HEX_POSTSCRIPT))
        {
          fprintf(stderr, "%s: sorry, cannot revert this type of hexdump\n", pname);
	  return -1;
	}
      return huntype(fp, fpo, stderr, pname, cols, hextype,
		negseek ? -seekoff : seekoff);
    }

  if (seekoff || negseek || !relseek)
    {
#ifdef TRY_SEEK
      if (relseek)
        e = fseek(fp, negseek ? -seekoff : seekoff, 1);
      else
        e = fseek(fp, negseek ? -seekoff : seekoff, negseek ? 2 : 0);
      if (e < 0 && negseek)
        {
	  fprintf(stderr, "%s: sorry cannot seek.\n", pname);
	  return 4;
	}
      if (e >= 0)
        seekoff = ftell(fp);
      else
#endif
	{
	  long s = seekoff;

	  while (s--)
	    getc(fp);
	}
    }

  if (hextype == HEX_CINCLUDE)
    {
      if (fp != stdin)
	{
	  fprintf(fpo, "unsigned char %s", isdigit(argv[1][0]) ? "__" : "");
	  for (e = 0; (c = argv[1][e]) != 0; e++)
	    putc(isalnum(c) ? c : '_', fpo);
	  fputs("[] = {\n", fpo);
	}

      p = 0;
      while ((length < 0 || p < length) && (c = getc(fp)) != EOF)
	{
	  fprintf(fpo, (hexx == hexxa) ? "%s0x%02x" : "%s0X%02X",
	    (p % cols) ? ", " : ",\n  "+2*!p,  c);
	  p++;
	}

      if (p)
        fputs("\n};\n"+3*(fp == stdin), fpo);

      if (fp != stdin)
	{
	  fprintf(fpo, "unsigned int %s", isdigit(argv[1][0]) ? "__" : "");
	  for (e = 0; (c = argv[1][e]) != 0; e++)
	    putc(isalnum(c) ? c : '_', fpo);
	  fprintf(fpo, "_len = %d;\n", p);
	}

      fclose(fp);
      fclose(fpo);
      return 0;
    }

  if (hextype == HEX_POSTSCRIPT)
    {
      p = cols;
      while ((length < 0 || n < length) && (e = getc(fp)) != EOF)
	{
          putchar(hexx[(e >> 4) & 0xf]);
          putchar(hexx[(e     ) & 0xf]);
	  n++;
	  if (!--p)
	    {
	      putchar('\n');
	      p = cols;
	    }
	}
      if (p < cols)
	putchar('\n');
      fclose(fp);
      fclose(fpo);
      return 0;
    }

  /* hextype == HEX_NORMAL */

  grplen = octspergrp + octspergrp + 1;		/* chars per octet group */

  while ((length < 0 || n < length) && (e = getc(fp)) != EOF)
    {
      if (p == 0)
	{
	  sprintf(l, "%07lx: ", n + seekoff);
	  for (c = 9; c < LLEN; l[c++] = ' ');
	}
      l[c = (9 + (grplen * p) / octspergrp)] = hexx[(e >> 4) & 0xf];
      l[++c]                                 = hexx[ e       & 0xf];
      if (ebcdic)
        e = (e < 64) ? '.' : etoa64[e-64];
      l[11 + (grplen * cols - 1)/octspergrp + p] = (e > 31 && e < 127) ? e : '.';
      if (e)
        nonzero++;
      n++;
      if (++p == cols)
	{
	  l[c = (11 + (grplen * cols - 1)/octspergrp + p)] = '\n'; l[++c] = '\0';
	  xxdline(fpo, l, autoskip ? nonzero : 1);
	  nonzero = 0;
	  p = 0;
	}
    }
  if (p)
    {
      l[c = (11 + (grplen * cols - 1)/octspergrp + p)] = '\n'; l[++c] = '\0';
      xxdline(fpo, l, 1);
    }
  else if (autoskip)
    xxdline(fpo, l, -1);	/* last chance to flush out supressed lines */

  fclose(fp);
  fclose(fpo);
  return 0;
}