compat/stdio.h

   1 /*
   2  * Copyright (C) 1996-2017 The Squid Software Foundation and contributors
   3  *
   4  * Squid software is distributed under GPLv2+ license and includes
   5  * contributions from numerous individuals and organizations.
   6  * Please see the COPYING and CONTRIBUTORS files for details.
   7  */
   8
   9 #ifndef _SQUID_COMPAT_STDIO_H
  10 #define _SQUID_COMPAT_STDIO_H
  11
  12 /** 64-bit broken <cstdio>
  13  *
  14  * <stdio.h> provides fgetpos64, fopen64 if __USE_FILE_OFFSET64 is defined.
  15  * It then checks whether a gcc-specific __REDIRECT macro is available
  16  * (defined in <sys/cdefs.h>, depending on __GNUC__ begin available).
  17  * If it is not available, it does a preprocessor #define.
  18  * Which <cstdio> undefines, with this comment:
  19  *   "// Get rid of those macros defined in <stdio.h>  in lieu of real functions.".
  20  *  When it does a namespace redirection ("namespace std { using ::fgetpos; }") it goes blam, as
  21  * fgetpos64 is available, while fgetpos is not.
  22  */
  23
  24 // Import the stdio.h definitions first to do the state setup
  25 #if HAVE_STDIO_H
  26 #include <stdio.h>
  27 #endif
  28
  29 // Check for the buggy case
  30 #if defined(__USE_FILE_OFFSET64) && !defined(__REDIRECT)
  31
  32 // Define the problem functions as needed
  33 #if defined(fgetpos)
  34 #undef fgetpos
  35 inline int fgetpos(FILE *f, fpos64_t *p) { return fgetpos64(f,p); }
  36 #endif
  37 #if defined(fopen)
  38 #undef fopen
  39 inline FILE * fopen(const char *f, const char *m) { return fopen64(f,m); }
  40 #endif
  41 #if defined(freopen)
  42 #undef freopen
  43 inline FILE * freopen(const char *f, const char *m, FILE *s) { return freopen64(f,m,s); }
  44 #endif
  45 #if defined(fsetpos)
  46 #undef fsetpos
  47 inline int fsetpos(FILE *f, fpos64_t *p) { return fsetpos64(f,p); }
  48 #endif
  49 #if defined(tmpfile)
  50 #undef tmpfile
  51 inline FILE * tmpfile(void) { return tmpfile64(); }
  52 #endif
  53
  54 #endif /* __USE_FILE_OFFSET64 && !__REDIRECT */
  55
  56 // Finally import the <cstdio> stuff we actually use
  57 #if defined(__cplusplus)
  58 #include <cstdio>
  59 #endif
  60
  61 #ifndef MAXPATHLEN
  62 #define MAXPATHLEN SQUID_MAXPATHLEN
  63 #endif
  64
  65 #endif /* _SQUID_COMPAT_STDIO_H */
  66