inet_net.c 3.1 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100
  1. /*
  2. * Copyright (c) 1983, 1993
  3. * The Regents of the University of California. All rights reserved.
  4. * All rights reserved.
  5. *
  6. * Redistribution and use in source and binary forms, with or without
  7. * modification, are permitted provided that the following conditions
  8. * are met:
  9. * 1. Redistributions of source code must retain the above copyright
  10. * notice, this list of conditions and the following disclaimer.
  11. * 2. Redistributions in binary form must reproduce the above copyright
  12. * notice, this list of conditions and the following disclaimer in the
  13. * documentation and/or other materials provided with the distribution.
  14. * 3. All advertising materials mentioning features or use of this software
  15. * must display the following acknowledgement:
  16. * This product includes software developed by the University of
  17. * California, Berkeley and its contributors.
  18. * 4. Neither the name of the University nor the names of its contributors
  19. * may be used to endorse or promote products derived from this software
  20. * without specific prior written permission.
  21. *
  22. * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23. * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25. * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26. * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27. * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28. * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30. * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31. * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32. * SUCH DAMAGE.
  33. */
  34. #define __FORCE_GLIBC
  35. #include <features.h>
  36. #include <ctype.h>
  37. #include <netinet/in.h>
  38. /*
  39. * Internet network address interpretation routine.
  40. * The library routines call this routine to interpret
  41. * network numbers.
  42. */
  43. in_addr_t
  44. inet_network(const char *cp)
  45. {
  46. register in_addr_t val, base, n;
  47. register char c;
  48. in_addr_t parts[4], *pp = parts;
  49. register int i;
  50. again:
  51. /*
  52. * Collect number up to ``.''.
  53. * Values are specified as for C:
  54. * 0x=hex, 0=octal, other=decimal.
  55. */
  56. val = 0; base = 10;
  57. /*
  58. * The 4.4BSD version of this file also accepts 'x__' as a hexa
  59. * number. I don't think this is correct. -- Uli
  60. */
  61. if (*cp == '0') {
  62. if (*++cp == 'x' || *cp == 'X')
  63. base = 16, cp++;
  64. else
  65. base = 8;
  66. }
  67. while ((c = *cp)) {
  68. if (isdigit(c)) {
  69. val = (val * base) + (c - '0');
  70. cp++;
  71. continue;
  72. }
  73. if (base == 16 && isxdigit(c)) {
  74. val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A'));
  75. cp++;
  76. continue;
  77. }
  78. break;
  79. }
  80. if (*cp == '.') {
  81. if (pp >= parts + 4)
  82. return (INADDR_NONE);
  83. *pp++ = val, cp++;
  84. goto again;
  85. }
  86. if (*cp && !isspace(*cp))
  87. return (INADDR_NONE);
  88. *pp++ = val;
  89. n = pp - parts;
  90. if (n > 4)
  91. return (INADDR_NONE);
  92. for (val = 0, i = 0; i < n; i++) {
  93. val <<= 8;
  94. val |= parts[i] & 0xff;
  95. }
  96. return (val);
  97. }