fseeko.c 1.8 KB

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  1. /* Copyright (C) 2004 Manuel Novoa III <mjn3@codepoet.org>
  2. *
  3. * GNU Library General Public License (LGPL) version 2 or later.
  4. *
  5. * Dedicated to Toni. See uClibc/DEDICATION.mjn3 for details.
  6. */
  7. #include "_stdio.h"
  8. #if SEEK_SET != 0 || SEEK_CUR != 1 || SEEK_END != 2
  9. # error Assumption violated -- values of SEEK_SET, SEEK_CUR, SEEK_END
  10. #endif
  11. #ifndef __DO_LARGEFILE
  12. # define FSEEK __fseek
  13. # define OFFSET_TYPE long int
  14. #endif
  15. int attribute_hidden FSEEK(register FILE *stream, OFFSET_TYPE offset, int whence)
  16. {
  17. #if defined(__UCLIBC_HAS_LFS__) && !defined(__DO_LARGEFILE)
  18. return __fseeko64(stream, offset, whence);
  19. #else
  20. __offmax_t pos = offset;
  21. int retval = -1;
  22. __STDIO_AUTO_THREADLOCK_VAR;
  23. if (((unsigned int) whence) > 2) {
  24. __set_errno(EINVAL);
  25. } else {
  26. __STDIO_AUTO_THREADLOCK(stream);
  27. __STDIO_STREAM_VALIDATE(stream);
  28. if ((!__STDIO_STREAM_IS_WRITING(stream)
  29. || !__STDIO_COMMIT_WRITE_BUFFER(stream))
  30. && ((whence != SEEK_CUR)
  31. || (__stdio_adjust_position(stream, &pos) >= 0))
  32. && (__SEEK(stream, &pos, whence) >= 0)
  33. ) {
  34. /* Clear reading/writing modes, EOF, and ungots. */
  35. stream->__modeflags &=
  36. ~(__MASK_READING|__FLAG_WRITING|__FLAG_EOF);
  37. /* Make sure all pointers are reset. */
  38. __STDIO_STREAM_INIT_BUFREAD_BUFPOS(stream);
  39. __STDIO_STREAM_DISABLE_GETC(stream);
  40. __STDIO_STREAM_DISABLE_PUTC(stream);
  41. /* We reinitialize the mbstate object. Doing so is
  42. * implementation defined behavior. */
  43. #ifdef __STDIO_MBSTATE
  44. __INIT_MBSTATE(&(stream->__state));
  45. #endif
  46. #ifdef __UCLIBC_HAS_WCHAR__
  47. stream->__ungot_width[0] = 0;
  48. #endif
  49. retval = 0;
  50. }
  51. __STDIO_STREAM_VALIDATE(stream);
  52. __STDIO_AUTO_THREADUNLOCK(stream);
  53. }
  54. return retval;
  55. #endif
  56. }
  57. #ifdef __DO_LARGEFILE
  58. weak_alias(__fseeko64,fseeko64)
  59. #else
  60. weak_alias(__fseek,fseek)
  61. weak_alias(fseek,fseeko)
  62. #endif