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annotate lib/freadahead.c @ 9881:e21211210418

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Port the extended stdio functions to emx+gcc.
author Bruno Haible <bruno@clisp.org>
date Thu, 10 Apr 2008 00:56:00 +0200
parents 057a5220dfd5
children 9a02133ad731
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1 /* Retrieve information about a FILE stream.
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2 Copyright (C) 2007-2008 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 size_t
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23 freadahead (FILE *fp)
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24 {
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25 #if defined _IO_ferror_unlocked /* GNU libc, BeOS */
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26 if (fp->_IO_write_ptr > fp->_IO_write_base)
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27 return 0;
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28 return (fp->_IO_read_end - fp->_IO_read_ptr)
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29 + (fp->_flags & _IO_IN_BACKUP ? fp->_IO_save_end - fp->_IO_save_base :
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30 0);
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31 #elif defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
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32 # if defined __NetBSD__ || defined __OpenBSD__
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33 struct __sfileext
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34 {
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35 struct __sbuf _ub; /* ungetc buffer */
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36 /* More fields, not relevant here. */
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37 };
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38 # define HASUB(fp) (((struct __sfileext *) (fp)->_ext._base)->_ub._base != NULL)
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39 # else
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40 # define HASUB(fp) ((fp)->_ub._base != NULL)
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41 # endif
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42 if ((fp->_flags & __SWR) != 0 || fp->_r < 0)
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43 return 0;
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44 return fp->_r
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45 + (HASUB (fp) ? fp->_ur : 0);
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46 #elif defined __EMX__ /* emx+gcc */
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47 if ((fp->_flags & _IOWRT) != 0)
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48 return 0;
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49 /* Note: fp->_ungetc_count > 0 implies fp->_rcount <= 0,
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50 fp->_ungetc_count = 0 implies fp->_rcount >= 0. */
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51 /* equivalent to
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52 (fp->_ungetc_count == 0 ? fp->_rcount : fp->_ungetc_count - fp->_rcount) */
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53 return (fp->_rcount > 0 ? fp->_rcount : fp->_ungetc_count - fp->_rcount);
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54 #elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw */
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55 # if defined __sun && defined _LP64 /* Solaris/{SPARC,AMD64} 64-bit */
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56 # define fp_ ((struct { unsigned char *_ptr; \
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57 unsigned char *_base; \
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58 unsigned char *_end; \
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59 long _cnt; \
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60 int _file; \
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61 unsigned int _flag; \
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62 } *) fp)
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63 if ((fp_->_flag & _IOWRT) != 0)
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64 return 0;
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65 return fp_->_cnt;
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66 # else
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67 # if defined _SCO_DS /* OpenServer */
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68 # define _flag __flag
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69 # define _cnt __cnt
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70 # endif
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71 if ((fp->_flag & _IOWRT) != 0)
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72 return 0;
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73 return fp->_cnt;
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74 # endif
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75 #elif defined __UCLIBC__ /* uClibc */
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76 # ifdef __STDIO_BUFFERS
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77 if (fp->__modeflags & __FLAG_WRITING)
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78 return 0;
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79 return (fp->__bufread - fp->__bufpos)
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80 + (fp->__modeflags & __FLAG_UNGOT ? 1 : 0);
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81 # else
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82 return 0;
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83 # endif
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84 #elif defined __QNX__ /* QNX */
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85 if ((fp->_Mode & 0x2000 /* _MWRITE */) != 0)
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86 return 0;
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87 /* fp->_Buf <= fp->_Next <= fp->_Rend,
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88 and fp->_Rend may be overridden by fp->_Rsave. */
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89 return ((fp->_Rsave ? fp->_Rsave : fp->_Rend) - fp->_Next)
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90 + (fp->_Mode & 0x4000 /* _MBYTE */
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91 ? (fp->_Back + sizeof (fp->_Back)) - fp->_Rback
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92 : 0);
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93 #else
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94 #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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95 #endif
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96 }