mirror of https://github.com/n-hys/bash.git
233 lines
7.8 KiB
C
233 lines
7.8 KiB
C
/* fpurge - Flushing buffers of a FILE stream. */
|
|
|
|
/* Copyright (C) 2007-2020 Free Software Foundation, Inc.
|
|
|
|
This file is part of GNU Bash, the Bourne Again SHell.
|
|
|
|
Bash is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
Bash is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with Bash. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <config.h>
|
|
|
|
#include "stdc.h"
|
|
|
|
#include <stdio.h>
|
|
|
|
/* Specification. Same as in ../../externs.h. */
|
|
#define NEED_FPURGE_DECL
|
|
#if HAVE_FPURGE
|
|
# define fpurge _bash_fpurge
|
|
#endif
|
|
extern int fpurge PARAMS((FILE *stream));
|
|
|
|
#if HAVE___FPURGE /* glibc >= 2.2, Haiku, Solaris >= 7 */
|
|
# include <stdio_ext.h>
|
|
#endif
|
|
#include <stdlib.h>
|
|
|
|
/* Inline contents of gnulib:stdio-impl.h */
|
|
|
|
/* Many stdio implementations have the same logic and therefore can share
|
|
the same implementation of stdio extension API, except that some fields
|
|
have different naming conventions, or their access requires some casts. */
|
|
|
|
/* BSD stdio derived implementations. */
|
|
|
|
#if defined __NetBSD__ /* NetBSD */
|
|
/* Get __NetBSD_Version__. */
|
|
# include <sys/param.h>
|
|
#endif
|
|
|
|
#if defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
|
|
|
|
# if defined __DragonFly__ /* DragonFly */
|
|
/* See <http://www.dragonflybsd.org/cvsweb/src/lib/libc/stdio/priv_stdio.h?rev=HEAD&content-type=text/x-cvsweb-markup>. */
|
|
# define fp_ ((struct { struct __FILE_public pub; \
|
|
struct { unsigned char *_base; int _size; } _bf; \
|
|
void *cookie; \
|
|
void *_close; \
|
|
void *_read; \
|
|
void *_seek; \
|
|
void *_write; \
|
|
struct { unsigned char *_base; int _size; } _ub; \
|
|
int _ur; \
|
|
unsigned char _ubuf[3]; \
|
|
unsigned char _nbuf[1]; \
|
|
struct { unsigned char *_base; int _size; } _lb; \
|
|
int _blksize; \
|
|
fpos_t _offset; \
|
|
/* More fields, not relevant here. */ \
|
|
} *) fp)
|
|
/* See <http://www.dragonflybsd.org/cvsweb/src/include/stdio.h?rev=HEAD&content-type=text/x-cvsweb-markup>. */
|
|
# define _p pub._p
|
|
# define _flags pub._flags
|
|
# define _r pub._r
|
|
# define _w pub._w
|
|
# else
|
|
# define fp_ fp
|
|
# endif
|
|
|
|
# if (defined __NetBSD__ && __NetBSD_Version__ >= 105270000) || defined __OpenBSD__ /* NetBSD >= 1.5ZA, OpenBSD */
|
|
/* See <http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup>
|
|
and <http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup> */
|
|
struct __sfileext
|
|
{
|
|
struct __sbuf _ub; /* ungetc buffer */
|
|
/* More fields, not relevant here. */
|
|
};
|
|
# define fp_ub ((struct __sfileext *) fp->_ext._base)->_ub
|
|
# else /* FreeBSD, NetBSD <= 1.5Z, DragonFly, MacOS X, Cygwin */
|
|
# define fp_ub fp_->_ub
|
|
# endif
|
|
|
|
# define HASUB(fp) (fp_ub._base != NULL)
|
|
|
|
#endif
|
|
|
|
/* SystemV derived implementations. */
|
|
|
|
#if defined _IOERR
|
|
|
|
# if defined __sun && defined _LP64 /* Solaris/{SPARC,AMD64} 64-bit */
|
|
# define fp_ ((struct { unsigned char *_ptr; \
|
|
unsigned char *_base; \
|
|
unsigned char *_end; \
|
|
long _cnt; \
|
|
int _file; \
|
|
unsigned int _flag; \
|
|
} *) fp)
|
|
# else
|
|
# define fp_ fp
|
|
# endif
|
|
|
|
# if defined _SCO_DS /* OpenServer */
|
|
# define _cnt __cnt
|
|
# define _ptr __ptr
|
|
# define _base __base
|
|
# define _flag __flag
|
|
# endif
|
|
|
|
#endif
|
|
|
|
int
|
|
fpurge (FILE *fp)
|
|
{
|
|
#if HAVE___FPURGE /* glibc >= 2.2, Haiku, Solaris >= 7 */
|
|
|
|
__fpurge (fp);
|
|
/* The __fpurge function does not have a return value. */
|
|
return 0;
|
|
|
|
#elif HAVE_FPURGE /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin 1.7 */
|
|
|
|
/* Call the system's fpurge function. */
|
|
# undef fpurge
|
|
# if !HAVE_DECL_FPURGE
|
|
extern int fpurge (FILE *);
|
|
# endif
|
|
int result = fpurge (fp);
|
|
# if defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
|
|
if (result == 0)
|
|
/* Correct the invariants that fpurge broke.
|
|
<stdio.h> on BSD systems says:
|
|
"The following always hold: if _flags & __SRD, _w is 0."
|
|
If this invariant is not fulfilled and the stream is read-write but
|
|
currently reading, subsequent putc or fputc calls will write directly
|
|
into the buffer, although they shouldn't be allowed to. */
|
|
if ((fp_->_flags & __SRD) != 0)
|
|
fp_->_w = 0;
|
|
# endif
|
|
return result;
|
|
|
|
#else
|
|
|
|
/* Most systems provide FILE as a struct and the necessary bitmask in
|
|
<stdio.h>, because they need it for implementing getc() and putc() as
|
|
fast macros. */
|
|
# if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
|
|
fp->_IO_read_end = fp->_IO_read_ptr;
|
|
fp->_IO_write_ptr = fp->_IO_write_base;
|
|
/* Avoid memory leak when there is an active ungetc buffer. */
|
|
if (fp->_IO_save_base != NULL)
|
|
{
|
|
free (fp->_IO_save_base);
|
|
fp->_IO_save_base = NULL;
|
|
}
|
|
return 0;
|
|
# elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
|
|
fp_->_p = fp_->_bf._base;
|
|
fp_->_r = 0;
|
|
fp_->_w = ((fp_->_flags & (__SLBF | __SNBF | __SRD)) == 0 /* fully buffered and not currently reading? */
|
|
? fp_->_bf._size
|
|
: 0);
|
|
/* Avoid memory leak when there is an active ungetc buffer. */
|
|
if (fp_ub._base != NULL)
|
|
{
|
|
if (fp_ub._base != fp_->_ubuf)
|
|
free (fp_ub._base);
|
|
fp_ub._base = NULL;
|
|
}
|
|
return 0;
|
|
# elif defined __EMX__ /* emx+gcc */
|
|
fp->_ptr = fp->_buffer;
|
|
fp->_rcount = 0;
|
|
fp->_wcount = 0;
|
|
fp->_ungetc_count = 0;
|
|
return 0;
|
|
# elif defined _IOERR || defined __TANDEM /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw */
|
|
fp->_ptr = fp->_base;
|
|
if (fp->_ptr != NULL)
|
|
fp->_cnt = 0;
|
|
return 0;
|
|
# elif defined __UCLIBC__ /* uClibc */
|
|
# ifdef __STDIO_BUFFERS
|
|
if (fp->__modeflags & __FLAG_WRITING)
|
|
fp->__bufpos = fp->__bufstart;
|
|
else if (fp->__modeflags & (__FLAG_READONLY | __FLAG_READING))
|
|
fp->__bufpos = fp->__bufread;
|
|
# endif
|
|
return 0;
|
|
# elif defined __QNX__ /* QNX */
|
|
fp->_Rback = fp->_Back + sizeof (fp->_Back);
|
|
fp->_Rsave = NULL;
|
|
if (fp->_Mode & 0x2000 /* _MWRITE */)
|
|
/* fp->_Buf <= fp->_Next <= fp->_Wend */
|
|
fp->_Next = fp->_Buf;
|
|
else
|
|
/* fp->_Buf <= fp->_Next <= fp->_Rend */
|
|
fp->_Rend = fp->_Next;
|
|
return 0;
|
|
# elif defined __MINT__ /* Atari FreeMiNT */
|
|
if (fp->__pushed_back)
|
|
{
|
|
fp->__bufp = fp->__pushback_bufp;
|
|
fp->__pushed_back = 0;
|
|
}
|
|
/* Preserve the current file position. */
|
|
if (fp->__target != -1)
|
|
fp->__target += fp->__bufp - fp->__buffer;
|
|
fp->__bufp = fp->__buffer;
|
|
/* Nothing in the buffer, next getc is nontrivial. */
|
|
fp->__get_limit = fp->__bufp;
|
|
/* Nothing in the buffer, next putc is nontrivial. */
|
|
fp->__put_limit = fp->__buffer;
|
|
return 0;
|
|
# else
|
|
# 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."
|
|
return 0;
|
|
# endif
|
|
|
|
#endif
|
|
}
|