nsapaddr.c

开放源码的编译器open watcom 1.6.0版的源代码

/*
 * Copyright (c) 1996 by Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

#include "socket.h"

#if defined(USE_BSD_FUNC)

static __inline char xtob (int c)
{
  return (c - (((c >= '0') && (c <= '9')) ? '0' : '7'));
}

u_int inet_nsap_addr (const char *ascii, u_char *binary, int maxlen)
{
  u_char c, nib;
  u_int  len = 0;

  while ((c = *ascii++) != '\0' && len < maxlen)
  {
    if (c == '.' || c == '+' || c == '/')
       continue;
    if (!isascii(c))
       return (0);
    if (islower(c))
       c = toupper(c);
    if (isxdigit(c))
    {
      nib = xtob(c);
      if ((c = *ascii++) != 0)
      {
        c = toupper(c);
        if (isxdigit(c))
        {
          *binary++ = (nib << 4) | xtob(c);
          len++;
        }
        else
          return (0);
      }
      else
        return (0);
    }
    else
      return (0);
  }
  return (len);
}

char *inet_nsap_ntoa (int binlen, const u_char *binary, char *ascii)
{
  static char tmpbuf[255*3];
  char  *start;
  int    i;

  if (ascii)
     start = ascii;
  else
  {
    ascii = tmpbuf;
    start = tmpbuf;
  }

  if (binlen > 255)
      binlen = 255;

  for (i = 0; i < binlen; i++)
  {
    int nib = *binary >> 4;
    *ascii++ = nib + (nib < 10 ? '0' : '7');
    nib = *binary++ & 0x0f;
    *ascii++ = nib + (nib < 10 ? '0' : '7');
    if (((i % 2) == 0 && (i + 1) < binlen))
       *ascii++ = '.';
  }
  *ascii = '\0';
  return (start);
}

#endif  /* USE_BSD_FUNC */