Rev 4874 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Copyright (c) 1990 The Regents of the University of California. |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms are permitted |
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| 6 | * provided that the above copyright notice and this paragraph are |
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| 7 | * duplicated in all such forms and that any documentation, |
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| 8 | * advertising materials, and other materials related to such |
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| 9 | * distribution and use acknowledge that the software was developed |
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| 10 | * by the University of California, Berkeley. The name of the |
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| 11 | * University may not be used to endorse or promote products derived |
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| 12 | * from this software without specific prior written permission. |
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| 13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
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| 14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
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| 15 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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| 16 | */ |
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| 17 | /* No user fns here. Pesch 15apr92. */ |
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| 18 | |||
| 19 | #if defined(LIBC_SCCS) && !defined(lint) |
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| 20 | static char sccsid[] = "%W% (Berkeley) %G%"; |
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| 21 | #endif /* LIBC_SCCS and not lint */ |
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| 22 | |||
| 23 | #include <_ansi.h> |
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| 24 | #include |
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| 25 | #include |
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| 26 | #include "local.h" |
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| 27 | #include "fvwrite.h" |
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| 28 | |||
| 29 | /* |
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| 30 | * Write the given character into the (probably full) buffer for |
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| 31 | * the given file. Flush the buffer out if it is or becomes full, |
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| 32 | * or if c=='\n' and the file is line buffered. |
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| 33 | */ |
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| 34 | |||
| 35 | int |
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| 36 | _DEFUN(__swbuf_r, (ptr, c, fp), |
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| 37 | struct _reent *ptr _AND |
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| 38 | register int c _AND |
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| 39 | register FILE *fp) |
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| 40 | { |
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| 41 | register int n; |
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| 42 | |||
| 43 | /* Ensure stdio has been initialized. */ |
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| 44 | |||
| 45 | CHECK_INIT (ptr, fp); |
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| 46 | |||
| 47 | /* |
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| 48 | * In case we cannot write, or longjmp takes us out early, |
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| 49 | * make sure _w is 0 (if fully- or un-buffered) or -_bf._size |
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| 50 | * (if line buffered) so that we will get called again. |
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| 51 | * If we did not do this, a sufficient number of putc() |
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| 52 | * calls might wrap _w from negative to positive. |
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| 53 | */ |
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| 54 | |||
| 55 | fp->_w = fp->_lbfsize; |
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| 56 | if (cantwrite (ptr, fp)) |
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| 6099 | serge | 57 | return EOF; |
| 4349 | Serge | 58 | c = (unsigned char) c; |
| 59 | |||
| 60 | ORIENT (fp, -1); |
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| 61 | |||
| 62 | /* |
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| 63 | * If it is completely full, flush it out. Then, in any case, |
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| 64 | * stuff c into the buffer. If this causes the buffer to fill |
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| 65 | * completely, or if c is '\n' and the file is line buffered, |
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| 66 | * flush it (perhaps a second time). The second flush will always |
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| 67 | * happen on unbuffered streams, where _bf._size==1; fflush() |
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| 68 | * guarantees that putc() will always call wbuf() by setting _w |
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| 69 | * to 0, so we need not do anything else. |
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| 70 | */ |
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| 71 | |||
| 72 | n = fp->_p - fp->_bf._base; |
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| 73 | if (n >= fp->_bf._size) |
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| 74 | { |
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| 75 | if (_fflush_r (ptr, fp)) |
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| 76 | return EOF; |
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| 77 | n = 0; |
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| 78 | } |
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| 79 | fp->_w--; |
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| 80 | *fp->_p++ = c; |
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| 81 | if (++n == fp->_bf._size || (fp->_flags & __SLBF && c == '\n')) |
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| 82 | if (_fflush_r (ptr, fp)) |
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| 83 | return EOF; |
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| 84 | return c; |
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| 85 | } |
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| 86 | |||
| 87 | /* This function isn't any longer declared in stdio.h, but it's |
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| 88 | required for backward compatibility with applications built against |
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| 89 | earlier dynamically built newlib libraries. */ |
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| 90 | int |
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| 91 | _DEFUN(__swbuf, (c, fp), |
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| 92 | register int c _AND |
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| 93 | register FILE *fp) |
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| 94 | { |
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| 95 | return __swbuf_r (_REENT, c, fp); |
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| 96 | } |