diff options
Diffstat (limited to 'newlib/libc/stdio/fflush.c')
| -rw-r--r-- | newlib/libc/stdio/fflush.c | 251 |
1 files changed, 0 insertions, 251 deletions
diff --git a/newlib/libc/stdio/fflush.c b/newlib/libc/stdio/fflush.c deleted file mode 100644 index ee24cf7ca..000000000 --- a/newlib/libc/stdio/fflush.c +++ /dev/null @@ -1,251 +0,0 @@ -/* - * Copyright (c) 1990 The Regents of the University of California. - * All rights reserved. - * - * Redistribution and use in source and binary forms are permitted - * provided that the above copyright notice and this paragraph are - * duplicated in all such forms and that any documentation, - * advertising materials, and other materials related to such - * distribution and use acknowledge that the software was developed - * by the University of California, Berkeley. The name of the - * University may not be used to endorse or promote products derived - * from this software without specific prior written permission. - * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR - * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED - * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. - */ - -/* -FUNCTION -<<fflush>>---flush buffered file output - -INDEX - fflush -INDEX - _fflush_r - -ANSI_SYNOPSIS - #include <stdio.h> - int fflush(FILE *<[fp]>); - - int _fflush_r(struct _reent *<[reent]>, FILE *<[fp]>); - -DESCRIPTION -The <<stdio>> output functions can buffer output before delivering it -to the host system, in order to minimize the overhead of system calls. - -Use <<fflush>> to deliver any such pending output (for the file -or stream identified by <[fp]>) to the host system. - -If <[fp]> is <<NULL>>, <<fflush>> delivers pending output from all -open files. - -Additionally, if <[fp]> is a seekable input stream visiting a file -descriptor, set the position of the file descriptor to match next -unread byte, useful for obeying POSIX semantics when ending a process -without consuming all input from the stream. - -The alternate function <<_fflush_r>> is a reentrant version, where the -extra argument <[reent]> is a pointer to a reentrancy structure, and -<[fp]> must not be NULL. - -RETURNS -<<fflush>> returns <<0>> unless it encounters a write error; in that -situation, it returns <<EOF>>. - -PORTABILITY -ANSI C requires <<fflush>>. The behavior on input streams is only -specified by POSIX, and not all implementations follow POSIX rules. - -No supporting OS subroutines are required. -*/ - -#include <_ansi.h> -#include <stdio.h> -#include <errno.h> -#include "local.h" - -/* Flush a single file, or (if fp is NULL) all files. */ - -/* Core function which does not lock file pointer. This gets called - directly from __srefill. */ -int -_DEFUN(__sflush_r, (ptr, fp), - struct _reent *ptr _AND - register FILE * fp) -{ - register unsigned char *p; - register int n, t; - - t = fp->_flags; - if ((t & __SWR) == 0) - { -#ifdef _FSEEK_OPTIMIZATION - /* For a read stream, an fflush causes the next seek to be - unoptimized (i.e. forces a system-level seek). This conforms - to the POSIX and SUSv3 standards. */ - fp->_flags |= __SNPT; -#endif - - /* For a seekable stream with buffered read characters, we will attempt - a seek to the current position now. A subsequent read will then get - the next byte from the file rather than the buffer. This conforms - to the POSIX and SUSv3 standards. Note that the standards allow - this seek to be deferred until necessary, but we choose to do it here - to make the change simpler, more contained, and less likely - to miss a code scenario. */ - if ((fp->_r > 0 || fp->_ur > 0) && fp->_seek != NULL) - { - int tmp_errno; -#ifdef __LARGE64_FILES - _fpos64_t curoff; -#else - _fpos_t curoff; -#endif - - /* Save last errno and set errno to 0, so we can check if a device - returns with a valid position -1. We restore the last errno if - no other error condition has been encountered. */ - tmp_errno = ptr->_errno; - ptr->_errno = 0; - /* Get the physical position we are at in the file. */ - if (fp->_flags & __SOFF) - curoff = fp->_offset; - else - { - /* We don't know current physical offset, so ask for it. - Only ESPIPE and EINVAL are ignorable. */ -#ifdef __LARGE64_FILES - if (fp->_flags & __SL64) - curoff = fp->_seek64 (ptr, fp->_cookie, 0, SEEK_CUR); - else -#endif - curoff = fp->_seek (ptr, fp->_cookie, 0, SEEK_CUR); - if (curoff == -1L && ptr->_errno != 0) - { - int result = EOF; - if (ptr->_errno == ESPIPE || ptr->_errno == EINVAL) - { - result = 0; - ptr->_errno = tmp_errno; - } - else - fp->_flags |= __SERR; - return result; - } - } - if (fp->_flags & __SRD) - { - /* Current offset is at end of buffer. Compensate for - characters not yet read. */ - curoff -= fp->_r; - if (HASUB (fp)) - curoff -= fp->_ur; - } - /* Now physically seek to after byte last read. */ -#ifdef __LARGE64_FILES - if (fp->_flags & __SL64) - curoff = fp->_seek64 (ptr, fp->_cookie, curoff, SEEK_SET); - else -#endif - curoff = fp->_seek (ptr, fp->_cookie, curoff, SEEK_SET); - if (curoff != -1 || ptr->_errno == 0 - || ptr->_errno == ESPIPE || ptr->_errno == EINVAL) - { - /* Seek successful or ignorable error condition. - We can clear read buffer now. */ -#ifdef _FSEEK_OPTIMIZATION - fp->_flags &= ~__SNPT; -#endif - fp->_r = 0; - fp->_p = fp->_bf._base; - if ((fp->_flags & __SOFF) && (curoff != -1 || ptr->_errno == 0)) - fp->_offset = curoff; - ptr->_errno = tmp_errno; - if (HASUB (fp)) - FREEUB (ptr, fp); - } - else - { - fp->_flags |= __SERR; - return EOF; - } - } - return 0; - } - if ((p = fp->_bf._base) == NULL) - { - /* Nothing to flush. */ - return 0; - } - n = fp->_p - p; /* write this much */ - - /* - * Set these immediately to avoid problems with longjmp - * and to allow exchange buffering (via setvbuf) in user - * write function. - */ - fp->_p = p; - fp->_w = t & (__SLBF | __SNBF) ? 0 : fp->_bf._size; - - while (n > 0) - { - t = fp->_write (ptr, fp->_cookie, (char *) p, n); - if (t <= 0) - { - fp->_flags |= __SERR; - return EOF; - } - p += t; - n -= t; - } - return 0; -} - -int -_DEFUN(_fflush_r, (ptr, fp), - struct _reent *ptr _AND - register FILE * fp) -{ - int ret; - -#ifdef _REENT_SMALL - /* For REENT_SMALL platforms, it is possible we are being - called for the first time on a std stream. This std - stream can belong to a reentrant struct that is not - _REENT. If CHECK_INIT gets called below based on _REENT, - we will end up changing said file pointers to the equivalent - std stream off of _REENT. This causes unexpected behavior if - there is any data to flush on the _REENT std stream. There - are two alternatives to fix this: 1) make a reentrant fflush - or 2) simply recognize that this file has nothing to flush - and return immediately before performing a CHECK_INIT. Choice - 2 is implemented here due to its simplicity. */ - if (fp->_bf._base == NULL) - return 0; -#endif /* _REENT_SMALL */ - - CHECK_INIT (ptr, fp); - - if (!fp->_flags) - return 0; - - _newlib_flockfile_start (fp); - ret = __sflush_r (ptr, fp); - _newlib_flockfile_end (fp); - return ret; -} - -#ifndef _REENT_ONLY - -int -_DEFUN(fflush, (fp), - register FILE * fp) -{ - if (fp == NULL) - return _fwalk_reent (_GLOBAL_REENT, _fflush_r); - - return _fflush_r (_REENT, fp); -} - -#endif /* _REENT_ONLY */ |