author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 02:01:42 +0200 | |
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/* WBUF.C |
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* |
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* Portions Copyright (c) 1990-1999 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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*/ |
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|
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/* No user fns here. Pesch 15apr92. */ |
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/* |
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* Copyright (c) 1990 The Regents of the University of California. |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms are permitted |
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* provided that the above copyright notice and this paragraph are |
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* duplicated in all such forms and that any documentation, |
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* advertising materials, and other materials related to such |
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* distribution and use acknowledge that the software was developed |
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* by the University of California, Berkeley. The name of the |
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* University may not be used to endorse or promote products derived |
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* from this software without specific prior written permission. |
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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*/ |
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#include <stdio.h> |
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#include "LOCAL.H" |
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#include "FVWRITE.H" |
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/* |
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* Write the given character into the (probably full) buffer for |
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* the given file. Flush the buffer out if it is or becomes full, |
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* or if c=='\n' and the file is line buffered. |
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*/ |
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int |
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__swbuf (register int c,register FILE *fp) |
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{ |
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register int n; |
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/* Ensure stdio has been initialized. */ |
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CHECK_INIT (fp); |
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/* |
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* In case we cannot write, or longjmp takes us out early, |
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* make sure _w is 0 (if fully- or un-buffered) or -_bf._size |
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* (if line buffered) so that we will get called again. |
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* If we did not do this, a sufficient number of putc() |
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* calls might wrap _w from negative to positive. |
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*/ |
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fp->_w = fp->_lbfsize; |
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if (cantwrite (fp)) |
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return EOF; |
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c = (unsigned char) c; |
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/* |
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* If it is completely full, flush it out. Then, in any case, |
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* stuff c into the buffer. If this causes the buffer to fill |
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* completely, or if c is '\n' and the file is line buffered, |
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* flush it (perhaps a second time). The second flush will always |
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* happen on unbuffered streams, where _bf._size==1; fflush() |
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* guarantees that putc() will always call wbuf() by setting _w |
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* to 0, so we need not do anything else. |
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*/ |
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n = fp->_p - fp->_bf._base; |
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if (n >= fp->_bf._size) |
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{ |
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if (fflush (fp)) |
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return EOF; |
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n = 0; |
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} |
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fp->_w--; |
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*fp->_p++ = (unsigned char)c; |
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if (++n == fp->_bf._size || (fp->_flags & __SLBF && c == '\n')) |
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if (fflush (fp)) |
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return EOF; |
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return c; |
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} |