Mercurial > hg > octave-lojdl > gnulib-hg

annotate lib/fbufmode.c @ 17464:290d581e2e24

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author Karl Berry <karl@freefriends.org>
date Sat, 10 Aug 2013 07:10:55 -0700
parents e542fd46ad6f
children
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1 /* Retrieve information about a FILE stream.
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2 Copyright (C) 2007-2013 Free Software Foundation, Inc.
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3
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4 This program is free software: you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 3 of the License, or
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7 (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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16
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17 #include <config.h>
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18
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19 /* Specification. */
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20 #include "fbufmode.h"
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21
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22 #if HAVE___FLBF
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23 # include <stdio_ext.h>
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24 #endif
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25
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26 #include "stdio-impl.h"
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27
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28 int
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29 fbufmode (FILE *fp)
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30 {
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31 /* Most systems provide FILE as a struct and the necessary bitmask in
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32 <stdio.h>, because they need it for implementing getc() and putc() as
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33 fast macros. */
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34 #if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
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35 # if HAVE___FLBF /* glibc >= 2.2 */
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36 if (__flbf (fp))
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37 return _IOLBF;
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38 # else
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39 if (fp->_flags & _IO_LINE_BUF)
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40 return _IOLBF;
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41 # endif
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42 if (fp->_flags & _IO_UNBUFFERED)
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43 return _IONBF;
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44 return _IOFBF;
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45 #elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin */
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46 if (fp_->_flags & __SLBF)
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47 return _IOLBF;
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48 if (fp_->_flags & __SNBF)
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49 return _IONBF;
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50 return _IOFBF;
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51 #elif defined __EMX__ /* emx+gcc */
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52 return fp->_flags & (_IOLBF | _IONBF | _IOFBF);
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53 #elif defined __minix /* Minix */
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54 return fp->_flags & (_IOLBF | _IONBF | _IOFBF);
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55 #elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw, NonStop Kernel */
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56 # if HAVE___FLBF /* Solaris >= 7 */
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57 if (__flbf (fp))
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58 return _IOLBF;
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59 # else
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60 if (fp->_flag & _IOLBF)
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61 return _IOLBF;
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62 # endif
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63 if (fp_->_flag & _IONBF)
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64 return _IONBF;
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65 return _IOFBF;
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66 #elif defined __UCLIBC__ /* uClibc */
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67 if (fp->__modeflags & __FLAG_LBF)
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68 return _IOLBF;
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69 if (fp->__modeflags & __FLAG_NBF)
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70 return _IONBF;
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71 return _IOFBF;
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72 #elif defined __QNX__ /* QNX */
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73 if (fp->_Mode & 0x400 /* _MLBF */)
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74 return _IOLBF;
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75 if (fp->_Mode & 0x800 /* _MNBF */)
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76 return _IONBF;
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77 return _IOFBF;
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78 #elif defined __MINT__ /* Atari FreeMiNT */
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79 if (fp->__linebuf)
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80 return _IOLBF;
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81 return (fp->__bufsize > 0 ? _IOFBF : _IONBF);
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82 #elif HAVE___FLBF && HAVE___FBUFSIZE /* musl libc */
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83 if (__flbf (fp))
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84 return _IOLBF;
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85 return (__fbufsize (fp) > 0 ? _IOFBF : _IONBF);
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86 #elif defined EPLAN9 /* Plan9 */
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87 if (fp->flags & 2 /* LINEBUF */)
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88 return _IOLBF;
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89 if (fp->bufl)
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90 return _IOFBF;
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91 return _IONBF;
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92 #else
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93 # error "Please port gnulib fbufmode.c to your platform! Look at the setvbuf implementation."
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94 #endif
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95 }