1 /* Copyright (c) 2014 Yaakov Selkowitz <yselkowi@redhat.com> */
2 /*
3 FUNCTION
4 <<stdio_ext>>,<<__fbufsize>>,<<__fpending>>,<<__flbf>>,<<__freadable>>,<<__fwritable>>,<<__freading>>,<<__fwriting>>---access internals of FILE structure
5
6 INDEX
7 __fbufsize
8 INDEX
9 __fpending
10 INDEX
11 __flbf
12 INDEX
13 __freadable
14 INDEX
15 __fwritable
16 INDEX
17 __freading
18 INDEX
19 __fwriting
20
21 SYNOPSIS
22 #include <stdio.h>
23 #include <stdio_ext.h>
24 size_t __fbufsize(FILE *<[fp]>);
25 size_t __fpending(FILE *<[fp]>);
26 int __flbf(FILE *<[fp]>);
27 int __freadable(FILE *<[fp]>);
28 int __fwritable(FILE *<[fp]>);
29 int __freading(FILE *<[fp]>);
30 int __fwriting(FILE *<[fp]>);
31
32 DESCRIPTION
33 These functions provides access to the internals of the FILE structure <[fp]>.
34
35 RETURNS
36 <<__fbufsize>> returns the number of bytes in the buffer of stream <[fp]>.
37
38 <<__fpending>> returns the number of bytes in the output buffer of stream <[fp]>.
39
40 <<__flbf>> returns nonzero if stream <[fp]> is line-buffered, and <<0>> if not.
41
42 <<__freadable>> returns nonzero if stream <[fp]> may be read, and <<0>> if not.
43
44 <<__fwritable>> returns nonzero if stream <[fp]> may be written, and <<0>> if not.
45
46 <<__freading>> returns nonzero if stream <[fp]> if the last operation on
47 it was a read, or if it read-only, and <<0>> if not.
48
49 <<__fwriting>> returns nonzero if stream <[fp]> if the last operation on
50 it was a write, or if it write-only, and <<0>> if not.
51
52 PORTABILITY
53 These functions originate from Solaris and are also provided by GNU libc.
54
55 No supporting OS subroutines are required.
56 */
57
58 #include <picolibc.h>
59
60 #ifndef __rtems__
61
62 #define _DEFAULT_SOURCE
63 #include <stdio.h>
64 #include <stdio_ext.h>
65
66 /* Subroutine versions of the inline or macro functions. */
67
68 size_t
__fbufsize(FILE * fp)69 __fbufsize (FILE * fp)
70 {
71 return (size_t) fp->_bf._size;
72 }
73
74 size_t
__fpending(FILE * fp)75 __fpending (FILE * fp)
76 {
77 return fp->_p - fp->_bf._base;
78 }
79
80 int
__flbf(FILE * fp)81 __flbf (FILE * fp)
82 {
83 return (fp->_flags & __SLBF) != 0;
84 }
85
86 int
__freadable(FILE * fp)87 __freadable (FILE * fp)
88 {
89 return (fp->_flags & (__SRD | __SRW)) != 0;
90 }
91
92 int
__fwritable(FILE * fp)93 __fwritable (FILE * fp)
94 {
95 return (fp->_flags & (__SWR | __SRW)) != 0;
96 }
97
98 int
__freading(FILE * fp)99 __freading (FILE * fp)
100 {
101 return (fp->_flags & __SRD) != 0;
102 }
103
104 int
__fwriting(FILE * fp)105 __fwriting (FILE * fp)
106 {
107 return (fp->_flags & __SWR) != 0;
108 }
109
110 #endif /* __rtems__ */
111
