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freadptr.c

Absolute File Name:/home/opencoverage/opencoverage/guest-scripts/coreutils/src/gnulib/lib/freadptr.c
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1/* Retrieve information about a FILE stream.-
2 Copyright (C) 2007-2018 Free Software Foundation, Inc.-
3-
4 This program is free software: you can redistribute it and/or modify-
5 it under the terms of the GNU General Public License as published by-
6 the Free Software Foundation; either version 3 of the License, or-
7 (at your option) any later version.-
8-
9 This program is distributed in the hope that it will be useful,-
10 but WITHOUT ANY WARRANTY; without even the implied warranty of-
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the-
12 GNU General Public License for more details.-
13-
14 You should have received a copy of the GNU General Public License-
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */-
16-
17#include <config.h>-
18-
19/* Specification. */-
20#include "freadptr.h"-
21-
22#include <stdlib.h>-
23-
24#include "stdio-impl.h"-
25-
26const char *-
27freadptr (FILE *fp, size_t *sizep)-
28{-
29 size_t size;-
30-
31 /* Keep this code in sync with freadahead! */-
32#if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */-
33 if (fp->_IO_write_ptr > fp->_IO_write_base)
fp->_IO_write_..._IO_write_baseDescription
TRUEnever evaluated
FALSEevaluated 281 times by 1 test
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0-281
34 return NULL;
never executed: return ((void *)0) ;
0
35 size = fp->_IO_read_end - fp->_IO_read_ptr;-
36 if (size == 0)
size == 0Description
TRUEevaluated 61 times by 1 test
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FALSEevaluated 220 times by 1 test
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61-220
37 return NULL;
executed 61 times by 1 test: return ((void *)0) ;
Executed by:
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61
38 *sizep = size;-
39 return (const char *) fp->_IO_read_ptr;
executed 220 times by 1 test: return (const char *) fp->_IO_read_ptr;
Executed by:
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220
40#elif defined __sferror || defined __DragonFly__ || defined __ANDROID__-
41 /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin, Minix 3, Android */-
42 if ((fp_->_flags & __SWR) != 0 || fp_->_r < 0)-
43 return NULL;-
44 size = fp_->_r;-
45 if (size == 0)-
46 return NULL;-
47 *sizep = size;-
48 return (const char *) fp_->_p;-
49#elif defined __EMX__ /* emx+gcc */-
50 if ((fp->_flags & _IOWRT) != 0)-
51 return NULL;-
52 /* Note: fp->_ungetc_count > 0 implies fp->_rcount <= 0,-
53 fp->_ungetc_count = 0 implies fp->_rcount >= 0. */-
54 if (fp->_rcount <= 0)-
55 return NULL;-
56 if (!(fp->_ungetc_count == 0))-
57 abort ();-
58 *sizep = fp->_rcount;-
59 return fp->_ptr;-
60#elif defined __minix /* Minix */-
61 if ((fp_->_flags & _IOWRITING) != 0)-
62 return NULL;-
63 size = fp_->_count;-
64 if (size == 0)-
65 return NULL;-
66 *sizep = size;-
67 return (const char *) fp_->_ptr;-
68#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw, MSVC, NonStop Kernel, OpenVMS */-
69 if ((fp_->_flag & _IOWRT) != 0)-
70 return NULL;-
71 size = fp_->_cnt;-
72 if (size == 0)-
73 return NULL;-
74 *sizep = size;-
75 return (const char *) fp_->_ptr;-
76#elif defined __UCLIBC__ /* uClibc */-
77# ifdef __STDIO_BUFFERS-
78 if (fp->__modeflags & __FLAG_WRITING)-
79 return NULL;-
80 if (fp->__modeflags & __FLAG_UNGOT)-
81 return NULL;-
82 size = fp->__bufread - fp->__bufpos;-
83 if (size == 0)-
84 return NULL;-
85 *sizep = size;-
86 return (const char *) fp->__bufpos;-
87# else-
88 return NULL;-
89# endif-
90#elif defined __QNX__ /* QNX */-
91 if ((fp->_Mode & 0x2000 /* _MWRITE */) != 0)-
92 return NULL;-
93 /* fp->_Buf <= fp->_Next <= fp->_Rend */-
94 size = fp->_Rend - fp->_Next;-
95 if (size == 0)-
96 return NULL;-
97 *sizep = size;-
98 return (const char *) fp->_Next;-
99#elif defined __MINT__ /* Atari FreeMiNT */-
100 if (!fp->__mode.__read)-
101 return NULL;-
102 size = fp->__get_limit - fp->__bufp;-
103 if (size == 0)-
104 return NULL;-
105 *sizep = size;-
106 return fp->__bufp;-
107#elif defined EPLAN9 /* Plan9 */-
108 if (fp->state == 4 /* WR */)-
109 return NULL;-
110 if (fp->rp >= fp->wp)-
111 return NULL;-
112 *sizep = fp->wp - fp->rp;-
113 return fp->rp;-
114#elif defined SLOW_BUT_NO_HACKS /* users can define this */-
115 /* This implementation is correct on any ANSI C platform. It is just-
116 awfully slow. */-
117 return NULL;-
118#else-
119 #error "Please port gnulib freadptr.c to your platform! Look at the definition of fflush, fread, getc, getc_unlocked on your system, then report this to bug-gnulib."-
120#endif-
121}-
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