newlib/libc/stdio/stdio_ext.c

   1 /*
   2 FUNCTION
   3 <<stdio_ext>>,<<__fbufsize>>,<<__fpending>>,<<__flbf>>,<<__freadable>>,<<__fwritable>>,<<__freading>>,<<__fwriting>>---access internals of FILE structure
   4
   5 INDEX
   6         __fbufsize
   7 INDEX
   8         __fpending
   9 INDEX
  10         __flbf
  11 INDEX
  12         __freadable
  13 INDEX
  14         __fwritable
  15 INDEX
  16         __freading
  17 INDEX
  18         __fwriting
  19
  20 SYNOPSIS
  21         #include <stdio.h>
  22         #include <stdio_ext.h>
  23         size_t __fbufsize(FILE *<[fp]>);
  24         size_t __fpending(FILE *<[fp]>);
  25         int __flbf(FILE *<[fp]>);
  26         int __freadable(FILE *<[fp]>);
  27         int __fwritable(FILE *<[fp]>);
  28         int __freading(FILE *<[fp]>);
  29         int __fwriting(FILE *<[fp]>);
  30
  31 DESCRIPTION
  32 These functions provides access to the internals of the FILE structure <[fp]>.
  33
  34 RETURNS
  35 <<__fbufsize>> returns the number of bytes in the buffer of stream <[fp]>.
  36
  37 <<__fpending>> returns the number of bytes in the output buffer of stream <[fp]>.
  38
  39 <<__flbf>> returns nonzero if stream <[fp]> is line-buffered, and <<0>> if not.
  40
  41 <<__freadable>> returns nonzero if stream <[fp]> may be read, and <<0>> if not.
  42
  43 <<__fwritable>> returns nonzero if stream <[fp]> may be written, and <<0>> if not.
  44
  45 <<__freading>> returns nonzero if stream <[fp]> if the last operation on
  46 it was a read, or if it read-only, and <<0>> if not.
  47
  48 <<__fwriting>> returns nonzero if stream <[fp]> if the last operation on
  49 it was a write, or if it write-only, and <<0>> if not.
  50
  51 PORTABILITY
  52 These functions originate from Solaris and are also provided by GNU libc.
  53
  54 No supporting OS subroutines are required.
  55 */
  56
  57 #ifndef __rtems__
  58
  59 #include <_ansi.h>
  60 #include <stdio.h>
  61
  62 /* Subroutine versions of the inline or macro functions. */
  63
  64 size_t
  65 __fbufsize (FILE * fp)
  66 {
  67   return (size_t) fp->_bf._size;
  68 }
  69
  70 size_t
  71 __fpending (FILE * fp)
  72 {
  73   return fp->_p - fp->_bf._base;
  74 }
  75
  76 int
  77 __flbf (FILE * fp)
  78 {
  79   return (fp->_flags & __SLBF) != 0;
  80 }
  81
  82 int
  83 __freadable (FILE * fp)
  84 {
  85   return (fp->_flags & (__SRD | __SRW)) != 0;
  86 }
  87
  88 int
  89 __fwritable (FILE * fp)
  90 {
  91   return (fp->_flags & (__SWR | __SRW)) != 0;
  92 }
  93
  94 int
  95 __freading (FILE * fp)
  96 {
  97   return (fp->_flags & __SRD) != 0;
  98 }
  99
 100 int
 101 __fwriting (FILE * fp)
 102 {
 103   return (fp->_flags & __SWR) != 0;
 104 }
 105
 106 #endif /* __rtems__ */