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annotate lib/freadptr.c @ 9779:569a44f4dd4d

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Extend freadptr to return also the buffer size.
author Bruno Haible <bruno@clisp.org>
date Mon, 10 Mar 2008 00:23:20 +0100
parents 7c1260f0aac3
children 057a5220dfd5
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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 "freadptr.h"
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21
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22 const char *
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23 freadptr (FILE *fp, size_t *sizep)
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24 {
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25 size_t size;
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26
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27 /* Keep this code in sync with freadahead! */
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28 #if defined _IO_ferror_unlocked /* GNU libc, BeOS */
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29 if (fp->_IO_write_ptr > fp->_IO_write_base)
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30 return NULL;
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31 size = fp->_IO_read_end - fp->_IO_read_ptr;
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32 if (size == 0)
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33 return NULL;
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34 *sizep = size;
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35 return (const char *) fp->_IO_read_ptr;
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36 #elif defined __sferror /* FreeBSD, NetBSD, OpenBSD, MacOS X, Cygwin */
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37 if ((fp->_flags & __SWR) != 0 || fp->_r < 0)
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38 return NULL;
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39 size = fp->_r;
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40 if (size == 0)
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41 return NULL;
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42 *sizep = size;
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43 return (const char *) fp->_p;
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44 #elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, mingw */
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45 # if defined __sun && defined _LP64 /* Solaris/{SPARC,AMD64} 64-bit */
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46 # define fp_ ((struct { unsigned char *_ptr; \
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47 unsigned char *_base; \
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48 unsigned char *_end; \
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49 long _cnt; \
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50 int _file; \
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51 unsigned int _flag; \
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52 } *) fp)
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53 if ((fp_->_flag & _IOWRT) != 0)
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54 return NULL;
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55 size = fp_->_cnt;
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56 if (size == 0)
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57 return NULL;
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58 *sizep = size;
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59 return (const char *) fp_->_ptr;
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60 # else
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61 if ((fp->_flag & _IOWRT) != 0)
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62 return NULL;
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63 size = fp->_cnt;
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64 if (size == 0)
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65 return NULL;
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66 *sizep = size;
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67 return (const char *) fp->_ptr;
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68 # endif
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69 #elif defined __UCLIBC__ /* uClibc */
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70 # ifdef __STDIO_BUFFERS
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71 if (fp->__modeflags & __FLAG_WRITING)
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72 return NULL;
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73 size = fp->__bufread - fp->__bufpos;
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74 if (size == 0)
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75 return NULL;
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76 *sizep = size;
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77 return (const char *) fp->__bufpos;
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78 # else
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79 return NULL;
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80 # endif
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81 #elif defined __QNX__ /* QNX */
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82 if ((fp->_Mode & 0x2000 /* _MWRITE */) != 0)
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83 return NULL;
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84 /* fp->_Buf <= fp->_Next <= fp->_Rend */
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85 size = fp->_Rend - fp->_Next;
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86 if (size == 0)
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87 return NULL;
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88 *sizep = size;
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89 return (const char *) fp->_Next;
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90 #else
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91 #error "Please port gnulib freadptr.c to your platform! Look at the definition of fflush, fread, getc, getc_unlocked on your system, then report this to bug-gnulib."
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92 #endif
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93 }