utf32be.h 1.6 KB

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  1. /*
  2. * Copyright (C) 1999-2001 Free Software Foundation, Inc.
  3. * This file is part of the GNU LIBICONV Library.
  4. *
  5. * The GNU LIBICONV Library is free software; you can redistribute it
  6. * and/or modify it under the terms of the GNU Library General Public
  7. * License as published by the Free Software Foundation; either version 2
  8. * of the License, or (at your option) any later version.
  9. *
  10. * The GNU LIBICONV Library is distributed in the hope that it will be
  11. * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
  12. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13. * Library General Public License for more details.
  14. *
  15. * You should have received a copy of the GNU Library General Public
  16. * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
  17. * If not, write to the Free Software Foundation, Inc., 51 Franklin Street,
  18. * Fifth Floor, Boston, MA 02110-1301, USA.
  19. */
  20. /*
  21. * UTF-32BE
  22. */
  23. /* Specification: Unicode 3.1 Standard Annex #19 */
  24. static int
  25. utf32be_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
  26. {
  27. if (n >= 4) {
  28. ucs4_t wc = (s[0] << 24) + (s[1] << 16) + (s[2] << 8) + s[3];
  29. if (wc < 0x110000 && !(wc >= 0xd800 && wc < 0xe000)) {
  30. *pwc = wc;
  31. return 4;
  32. } else
  33. return RET_ILSEQ;
  34. }
  35. return RET_TOOFEW(0);
  36. }
  37. static int
  38. utf32be_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
  39. {
  40. if (wc < 0x110000 && !(wc >= 0xd800 && wc < 0xe000)) {
  41. if (n >= 4) {
  42. r[0] = 0;
  43. r[1] = (unsigned char) (wc >> 16);
  44. r[2] = (unsigned char) (wc >> 8);
  45. r[3] = (unsigned char) wc;
  46. return 4;
  47. } else
  48. return RET_TOOSMALL;
  49. }
  50. return RET_ILUNI;
  51. }