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annotate lib/freadahead.c @ 13997:6fa9f46e6153

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Port extended stdio modules to HP NonStop Kernel. * lib/stdio-impl.h (_IOERR, _IOREAD, _IOWRT, _IORW) [__TANDEM]: New macros. * lib/fbufmode.c: Update comments. * lib/fflush.c: Likewise. * lib/fpurge.c: Likewise. * lib/freadable.c: Likewise. * lib/freadahead.c: Likewise. * lib/freading.c: Likewise. * lib/freadptr.c: Likewise. * lib/freadseek.c: Likewise. * lib/fseeko.c: Likewise. * lib/fseterr.c: Likewise. * lib/fwritable.c: Likewise. * lib/fwriting.c: Likewise. Reported by Joachim Schmitz <jojo@schmitz-digital.de>.
author Bruno Haible <bruno@clisp.org>
date Wed, 22 Dec 2010 17:37:34 +0100
parents c2cbabec01dd
children 97fc9a21a8fb
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1 /* Retrieve information about a FILE stream.
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2 Copyright (C) 2007-2010 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 "freadahead.h"
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21
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22 #include <stdlib.h>
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23 #include "stdio-impl.h"
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24
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25 size_t
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26 freadahead (FILE *fp)
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27 {
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28 #if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
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29 if (fp->_IO_write_ptr > fp->_IO_write_base)
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30 return 0;
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31 return (fp->_IO_read_end - fp->_IO_read_ptr)
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32 + (fp->_flags & _IO_IN_BACKUP ? fp->_IO_save_end - fp->_IO_save_base :
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33 0);
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34 #elif defined __sferror || defined __DragonFly__ /* FreeBSD, NetBSD, OpenBSD, DragonFly, MacOS X, Cygwin */
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35 if ((fp_->_flags & __SWR) != 0 || fp_->_r < 0)
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36 return 0;
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37 # if defined __DragonFly__
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38 return __sreadahead (fp);
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39 # else
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40 return fp_->_r
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41 + (HASUB (fp) ? fp_->_ur : 0);
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42 # endif
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43 #elif defined __EMX__ /* emx+gcc */
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44 if ((fp->_flags & _IOWRT) != 0)
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45 return 0;
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46 /* Note: fp->_ungetc_count > 0 implies fp->_rcount <= 0,
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47 fp->_ungetc_count = 0 implies fp->_rcount >= 0. */
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48 /* equivalent to
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49 (fp->_ungetc_count == 0 ? fp->_rcount : fp->_ungetc_count - fp->_rcount) */
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50 return (fp->_rcount > 0 ? fp->_rcount : fp->_ungetc_count - fp->_rcount);
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51 #elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw, NonStop Kernel */
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52 if ((fp_->_flag & _IOWRT) != 0)
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53 return 0;
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54 return fp_->_cnt;
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55 #elif defined __UCLIBC__ /* uClibc */
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56 # ifdef __STDIO_BUFFERS
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57 if (fp->__modeflags & __FLAG_WRITING)
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58 return 0;
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59 return (fp->__bufread - fp->__bufpos)
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60 + (fp->__modeflags & __FLAG_UNGOT ? 1 : 0);
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61 # else
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62 return 0;
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63 # endif
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64 #elif defined __QNX__ /* QNX */
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65 if ((fp->_Mode & 0x2000 /* _MWRITE */) != 0)
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66 return 0;
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67 /* fp->_Buf <= fp->_Next <= fp->_Rend,
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68 and fp->_Rend may be overridden by fp->_Rsave. */
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69 return ((fp->_Rsave ? fp->_Rsave : fp->_Rend) - fp->_Next)
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70 + (fp->_Mode & 0x4000 /* _MBYTE */
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71 ? (fp->_Back + sizeof (fp->_Back)) - fp->_Rback
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72 : 0);
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73 #elif defined __MINT__ /* Atari FreeMiNT */
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74 if (!fp->__mode.__read)
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75 return 0;
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76 return (fp->__pushed_back
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77 ? fp->__get_limit - fp->__pushback_bufp + 1
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78 : fp->__get_limit - fp->__bufp);
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79 #elif defined SLOW_BUT_NO_HACKS /* users can define this */
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80 abort ();
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81 return 0;
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82 #else
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83 #error "Please port gnulib freadahead.c to your platform! Look at the definition of fflush, fread, ungetc on your system, then report this to bug-gnulib."
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84 #endif
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85 }