1 | /* |
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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 | |
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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 | |
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23 | #include <_ansi.h> |
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24 | #include <stdio.h> |
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25 | #include <errno.h> |
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26 | #include "local.h" |
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27 | #include "fvwrite.h" |
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28 | |
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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 | |
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35 | int |
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36 | __swbuf_r (struct _reent *ptr, |
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37 | register int c, |
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38 | register FILE *fp) |
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39 | { |
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40 | register int n; |
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41 | |
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42 | /* Ensure stdio has been initialized. */ |
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43 | |
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44 | CHECK_INIT (ptr, fp); |
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45 | |
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46 | /* |
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47 | * In case we cannot write, or longjmp takes us out early, |
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48 | * make sure _w is 0 (if fully- or un-buffered) or -_bf._size |
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49 | * (if line buffered) so that we will get called again. |
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50 | * If we did not do this, a sufficient number of putc() |
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51 | * calls might wrap _w from negative to positive. |
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52 | */ |
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53 | |
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54 | fp->_w = fp->_lbfsize; |
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55 | if (cantwrite (ptr, fp)) |
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56 | return EOF; |
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57 | c = (unsigned char) c; |
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58 | |
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59 | ORIENT (fp, -1); |
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60 | |
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61 | /* |
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62 | * If it is completely full, flush it out. Then, in any case, |
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63 | * stuff c into the buffer. If this causes the buffer to fill |
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64 | * completely, or if c is '\n' and the file is line buffered, |
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65 | * flush it (perhaps a second time). The second flush will always |
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66 | * happen on unbuffered streams, where _bf._size==1; fflush() |
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67 | * guarantees that putc() will always call wbuf() by setting _w |
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68 | * to 0, so we need not do anything else. |
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69 | */ |
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70 | |
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71 | n = fp->_p - fp->_bf._base; |
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72 | if (n >= fp->_bf._size) |
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73 | { |
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74 | if (_fflush_r (ptr, fp)) |
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75 | return EOF; |
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76 | n = 0; |
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77 | } |
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78 | fp->_w--; |
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79 | *fp->_p++ = c; |
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80 | if (++n == fp->_bf._size || (fp->_flags & __SLBF && c == '\n')) |
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81 | if (_fflush_r (ptr, fp)) |
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82 | return EOF; |
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83 | return c; |
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84 | } |
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85 | |
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86 | /* This function isn't any longer declared in stdio.h, but it's |
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87 | required for backward compatibility with applications built against |
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88 | earlier dynamically built newlib libraries. */ |
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89 | int |
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90 | __swbuf (register int c, |
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91 | register FILE *fp) |
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92 | { |
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93 | return __swbuf_r (_REENT, c, fp); |
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94 | } |
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