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fpurge.c

Absolute File Name:/home/opencoverage/opencoverage/guest-scripts/bash/src/lib/sh/fpurge.c
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1/* fpurge - Flushing buffers of a FILE stream. */-
2-
3/* Copyright (C) 2007-2010 Free Software Foundation, Inc.-
4-
5 This file is part of GNU Bash, the Bourne Again SHell.-
6-
7 Bash is free software: you can redistribute it and/or modify-
8 it under the terms of the GNU General Public License as published by-
9 the Free Software Foundation, either version 3 of the License, or-
10 (at your option) any later version.-
11-
12 Bash is distributed in the hope that it will be useful,-
13 but WITHOUT ANY WARRANTY; without even the implied warranty of-
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the-
15 GNU General Public License for more details.-
16-
17 You should have received a copy of the GNU General Public License-
18 along with Bash. If not, see <http://www.gnu.org/licenses/>.-
19*/-
20-
21#include <config.h>-
22-
23#include "stdc.h"-
24-
25#include <stdio.h>-
26-
27/* Specification. Same as in ../../externs.h. */-
28#define NEED_FPURGE_DECL-
29#if HAVE_FPURGE-
30# define fpurge _bash_fpurge-
31#endif-
32extern int fpurge __P((FILE *stream));-
33-
34#if HAVE___FPURGE /* glibc >= 2.2, Haiku, Solaris >= 7 */-
35# include <stdio_ext.h>-
36#endif-
37#include <stdlib.h>-
38-
39/* Inline contents of gnulib:stdio-impl.h */-
40-
41/* Many stdio implementations have the same logic and therefore can share-
42 the same implementation of stdio extension API, except that some fields-
43 have different naming conventions, or their access requires some casts. */-
44-
45/* BSD stdio derived implementations. */-
46-
47#if defined __NetBSD__ /* NetBSD */-
48/* Get __NetBSD_Version__. */-
49# include <sys/param.h>-
50#endif-
51-
52#if defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */-
53-
54# if defined __DragonFly__ /* DragonFly */-
55 /* See <http://www.dragonflybsd.org/cvsweb/src/lib/libc/stdio/priv_stdio.h?rev=HEAD&content-type=text/x-cvsweb-markup>. */-
56# define fp_ ((struct { struct __FILE_public pub; \-
57 struct { unsigned char *_base; int _size; } _bf; \-
58 void *cookie; \-
59 void *_close; \-
60 void *_read; \-
61 void *_seek; \-
62 void *_write; \-
63 struct { unsigned char *_base; int _size; } _ub; \-
64 int _ur; \-
65 unsigned char _ubuf[3]; \-
66 unsigned char _nbuf[1]; \-
67 struct { unsigned char *_base; int _size; } _lb; \-
68 int _blksize; \-
69 fpos_t _offset; \-
70 /* More fields, not relevant here. */ \-
71 } *) fp)-
72 /* See <http://www.dragonflybsd.org/cvsweb/src/include/stdio.h?rev=HEAD&content-type=text/x-cvsweb-markup>. */-
73# define _p pub._p-
74# define _flags pub._flags-
75# define _r pub._r-
76# define _w pub._w-
77# else-
78# define fp_ fp-
79# endif-
80-
81# if (defined __NetBSD__ && __NetBSD_Version__ >= 105270000) || defined __OpenBSD__ /* NetBSD >= 1.5ZA, OpenBSD */-
82 /* See <http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup>-
83 and <http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup> */-
84 struct __sfileext-
85 {-
86 struct __sbuf _ub; /* ungetc buffer */-
87 /* More fields, not relevant here. */-
88 };-
89# define fp_ub ((struct __sfileext *) fp->_ext._base)->_ub-
90# else /* FreeBSD, NetBSD <= 1.5Z, DragonFly, MacOS X, Cygwin */-
91# define fp_ub fp_->_ub-
92# endif-
93-
94# define HASUB(fp) (fp_ub._base != NULL)-
95-
96#endif-
97-
98/* SystemV derived implementations. */-
99-
100#if defined _IOERR-
101-
102# if defined __sun && defined _LP64 /* Solaris/{SPARC,AMD64} 64-bit */-
103# define fp_ ((struct { unsigned char *_ptr; \-
104 unsigned char *_base; \-
105 unsigned char *_end; \-
106 long _cnt; \-
107 int _file; \-
108 unsigned int _flag; \-
109 } *) fp)-
110# else-
111# define fp_ fp-
112# endif-
113-
114# if defined _SCO_DS /* OpenServer */-
115# define _cnt __cnt-
116# define _ptr __ptr-
117# define _base __base-
118# define _flag __flag-
119# endif-
120-
121#endif-
122-
123int-
124fpurge (FILE *fp)-
125{-
126#if HAVE___FPURGE /* glibc >= 2.2, Haiku, Solaris >= 7 */-
127-
128 __fpurge (fp);-
129 /* The __fpurge function does not have a return value. */-
130 return 0;
executed 34695392 times by 1 test: return 0;
Executed by:
  • Self test
34695392
131-
132#elif HAVE_FPURGE /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin 1.7 */-
133-
134 /* Call the system's fpurge function. */-
135# undef fpurge-
136# if !HAVE_DECL_FPURGE-
137 extern int fpurge (FILE *);-
138# endif-
139 int result = fpurge (fp);-
140# if defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */-
141 if (result == 0)-
142 /* Correct the invariants that fpurge broke.-
143 <stdio.h> on BSD systems says:-
144 "The following always hold: if _flags & __SRD, _w is 0."-
145 If this invariant is not fulfilled and the stream is read-write but-
146 currently reading, subsequent putc or fputc calls will write directly-
147 into the buffer, although they shouldn't be allowed to. */-
148 if ((fp_->_flags & __SRD) != 0)-
149 fp_->_w = 0;-
150# endif-
151 return result;-
152-
153#else-
154-
155 /* Most systems provide FILE as a struct and the necessary bitmask in-
156 <stdio.h>, because they need it for implementing getc() and putc() as-
157 fast macros. */-
158# if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */-
159 fp->_IO_read_end = fp->_IO_read_ptr;-
160 fp->_IO_write_ptr = fp->_IO_write_base;-
161 /* Avoid memory leak when there is an active ungetc buffer. */-
162 if (fp->_IO_save_base != NULL)-
163 {-
164 free (fp->_IO_save_base);-
165 fp->_IO_save_base = NULL;-
166 }-
167 return 0;-
168# elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */-
169 fp_->_p = fp_->_bf._base;-
170 fp_->_r = 0;-
171 fp_->_w = ((fp_->_flags & (__SLBF | __SNBF | __SRD)) == 0 /* fully buffered and not currently reading? */-
172 ? fp_->_bf._size-
173 : 0);-
174 /* Avoid memory leak when there is an active ungetc buffer. */-
175 if (fp_ub._base != NULL)-
176 {-
177 if (fp_ub._base != fp_->_ubuf)-
178 free (fp_ub._base);-
179 fp_ub._base = NULL;-
180 }-
181 return 0;-
182# elif defined __EMX__ /* emx+gcc */-
183 fp->_ptr = fp->_buffer;-
184 fp->_rcount = 0;-
185 fp->_wcount = 0;-
186 fp->_ungetc_count = 0;-
187 return 0;-
188# elif defined _IOERR || defined __TANDEM /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw */-
189 fp->_ptr = fp->_base;-
190 if (fp->_ptr != NULL)-
191 fp->_cnt = 0;-
192 return 0;-
193# elif defined __UCLIBC__ /* uClibc */-
194# ifdef __STDIO_BUFFERS-
195 if (fp->__modeflags & __FLAG_WRITING)-
196 fp->__bufpos = fp->__bufstart;-
197 else if (fp->__modeflags & (__FLAG_READONLY | __FLAG_READING))-
198 fp->__bufpos = fp->__bufread;-
199# endif-
200 return 0;-
201# elif defined __QNX__ /* QNX */-
202 fp->_Rback = fp->_Back + sizeof (fp->_Back);-
203 fp->_Rsave = NULL;-
204 if (fp->_Mode & 0x2000 /* _MWRITE */)-
205 /* fp->_Buf <= fp->_Next <= fp->_Wend */-
206 fp->_Next = fp->_Buf;-
207 else-
208 /* fp->_Buf <= fp->_Next <= fp->_Rend */-
209 fp->_Rend = fp->_Next;-
210 return 0;-
211# elif defined __MINT__ /* Atari FreeMiNT */-
212 if (fp->__pushed_back)-
213 {-
214 fp->__bufp = fp->__pushback_bufp;-
215 fp->__pushed_back = 0;-
216 }-
217 /* Preserve the current file position. */-
218 if (fp->__target != -1)-
219 fp->__target += fp->__bufp - fp->__buffer;-
220 fp->__bufp = fp->__buffer;-
221 /* Nothing in the buffer, next getc is nontrivial. */-
222 fp->__get_limit = fp->__bufp;-
223 /* Nothing in the buffer, next putc is nontrivial. */-
224 fp->__put_limit = fp->__buffer;-
225 return 0;-
226# else-
227# warning "Please port gnulib fpurge.c to your platform! Look at the definitions of fflush, setvbuf and ungetc on your system, then report this to bug-gnulib."-
228 return 0;-
229# endif-
230-
231#endif-
232}-
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