main/gcc/ada/cstreams.c

   1 /****************************************************************************
   2  *                                                                          *
   3  *                          GNAT RUN-TIME COMPONENTS                        *
   4  *                                                                          *
   5  *                              C S T R E A M S                             *
   6  *                                                                          *
   7  *              Auxiliary C functions for Interfaces.C.Streams              *
   8  *                                                                          *
   9  *          Copyright (C) 1992-2014, Free Software Foundation, Inc.         *
  10  *                                                                          *
  11  * GNAT is free software;  you can  redistribute it  and/or modify it under *
  12  * terms of the  GNU General Public License as published  by the Free Soft- *
  13  * ware  Foundation;  either version 3,  or (at your option) any later ver- *
  14  * sion.  GNAT is distributed in the hope that it will be useful, but WITH- *
  15  * OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY *
  16  * or FITNESS FOR A PARTICULAR PURPOSE.                                     *
  17  *                                                                          *
  18  * As a special exception under Section 7 of GPL version 3, you are granted *
  19  * additional permissions described in the GCC Runtime Library Exception,   *
  20  * version 3.1, as published by the Free Software Foundation.               *
  21  *                                                                          *
  22  * You should have received a copy of the GNU General Public License and    *
  23  * a copy of the GCC Runtime Library Exception along with this program;     *
  24  * see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    *
  25  * <http://www.gnu.org/licenses/>.                                          *
  26  *                                                                          *
  27  * GNAT was originally developed  by the GNAT team at  New York University. *
  28  * Extensive contributions were provided by Ada Core Technologies Inc.      *
  29  *                                                                          *
  30  ****************************************************************************/
  31
  32 /* Routines required for implementing routines in Interfaces.C.Streams.  */
  33
  34 #ifndef _LARGEFILE_SOURCE
  35 #define _LARGEFILE_SOURCE
  36 #endif
  37 #define _FILE_OFFSET_BITS 64
  38 /* the define above will make off_t a 64bit type on GNU/Linux */
  39
  40 #include <stdio.h>
  41 #include <sys/types.h>
  42
  43 #ifdef _AIX
  44 /* needed to avoid conflicting declarations */
  45 #include <unistd.h>
  46 #include <sys/mman.h>
  47 #endif
  48
  49 #ifdef __vxworks
  50 #include "vxWorks.h"
  51 #endif
  52
  53 #ifdef IN_RTS
  54 #include "tconfig.h"
  55 #include "tsystem.h"
  56 #include <sys/stat.h>
  57 #else
  58 #include "config.h"
  59 #include "system.h"
  60 #endif
  61
  62 #include "adaint.h"
  63
  64 #ifdef __cplusplus
  65 extern "C" {
  66 #endif
  67
  68 #ifdef VMS
  69 #include <unixlib.h>
  70 #endif
  71
  72 #ifdef linux
  73 /* Don't use macros on GNU/Linux since they cause incompatible changes between
  74    glibc 2.0 and 2.1 */
  75
  76 #ifdef stderr
  77 #  undef stderr
  78 #endif
  79 #ifdef stdin
  80 #  undef stdin
  81 #endif
  82 #ifdef stdout
  83 #  undef stdout
  84 #endif
  85
  86 #endif
  87
  88 /* Don't use macros versions of this functions on VxWorks since they cause
  89    imcompatible changes in some VxWorks versions */
  90 #ifdef __vxworks
  91 #undef getchar
  92 #undef putchar
  93 #undef feof
  94 #undef ferror
  95 #undef fileno
  96 #endif
  97
  98 /* The _IONBF value in MINGW32 stdio.h is wrong.  */
  99 #if defined (WINNT) || defined (_WINNT)
 100 #if OLD_MINGW
 101 #undef _IONBF
 102 #define _IONBF 0004
 103 #endif
 104 #endif
 105
 106 int
 107 __gnat_feof (FILE *stream)
 108 {
 109   return (feof (stream));
 110 }
 111
 112 int
 113 __gnat_ferror (FILE *stream)
 114 {
 115    return (ferror (stream));
 116 }
 117
 118 int
 119 __gnat_fileno (FILE *stream)
 120 {
 121    return (fileno (stream));
 122 }
 123
 124 /* on some systems, the constants for seek are not defined, if so, then
 125    provide the conventional definitions */
 126
 127 #ifndef SEEK_SET
 128 #define SEEK_SET 0  /* Set file pointer to offset                           */
 129 #define SEEK_CUR 1  /* Set file pointer to its current value plus offset    */
 130 #define SEEK_END 2  /* Set file pointer to the size of the file plus offset */
 131 #endif
 132
 133 /* if L_tmpnam is not set, use a large number that should be safe */
 134 #ifndef L_tmpnam
 135 #define L_tmpnam 256
 136 #endif
 137
 138 int    __gnat_constant_eof      = EOF;
 139 int    __gnat_constant_iofbf    = _IOFBF;
 140 int    __gnat_constant_iolbf    = _IOLBF;
 141 int    __gnat_constant_ionbf    = _IONBF;
 142 int    __gnat_constant_l_tmpnam = L_tmpnam;
 143 int    __gnat_constant_seek_cur = SEEK_CUR;
 144 int    __gnat_constant_seek_end = SEEK_END;
 145 int    __gnat_constant_seek_set = SEEK_SET;
 146
 147 FILE *
 148 __gnat_constant_stderr (void)
 149 {
 150   return stderr;
 151 }
 152
 153 FILE *
 154 __gnat_constant_stdin (void)
 155 {
 156   return stdin;
 157 }
 158
 159 FILE *
 160 __gnat_constant_stdout (void)
 161 {
 162   return stdout;
 163 }
 164
 165 char *
 166 __gnat_full_name (char *nam, char *buffer)
 167 {
 168 #ifdef RTSS
 169   /* RTSS applications have no current-directory notion, so RTSS file I/O
 170      requests must use fully qualified path names, such as:
 171        c:\temp\MyFile.txt (for a file system object)
 172        \\.\MyDevice0 (for a device object)
 173    */
 174   if (nam[1] == ':' || nam[0] == '\\')
 175     strcpy (buffer, nam);
 176   else
 177     buffer[0] = '\0';
 178
 179 #elif defined (__MINGW32__)
 180   /* If this is a device file return it as is;
 181      under Windows NT a device file ends with ":".  */
 182   if (nam[strlen (nam) - 1] == ':')
 183     strcpy (buffer, nam);
 184   else
 185     {
 186       char *p;
 187
 188       _fullpath (buffer, nam, __gnat_max_path_len);
 189
 190       for (p = buffer; *p; p++)
 191         if (*p == '/')
 192           *p = '\\';
 193     }
 194
 195 #elif defined (__FreeBSD__)
 196
 197   /* Use realpath function which resolves links and references to . and ..
 198      on those Unix systems that support it. Note that GNU/Linux provides it but
 199      cannot handle more than 5 symbolic links in a full name, so we use the
 200      getcwd approach instead. */
 201   realpath (nam, buffer);
 202
 203 #elif defined (VMS)
 204   strncpy (buffer, __gnat_to_canonical_file_spec (nam), __gnat_max_path_len);
 205
 206   if (buffer[0] == '/' || strchr (buffer, '!'))  /* '!' means decnet node */
 207     strncpy (buffer, __gnat_to_host_file_spec (buffer), __gnat_max_path_len);
 208   else
 209     {
 210       char *nambuffer = alloca (__gnat_max_path_len);
 211
 212       strncpy (nambuffer, buffer, __gnat_max_path_len);
 213       strncpy
 214         (buffer, getcwd (buffer, __gnat_max_path_len, 0), __gnat_max_path_len);
 215       strncat (buffer, "/", __gnat_max_path_len);
 216       strncat (buffer, nambuffer, __gnat_max_path_len);
 217       strncpy (buffer, __gnat_to_host_file_spec (buffer), __gnat_max_path_len);
 218     }
 219
 220 #elif defined (__vxworks)
 221
 222   /* On VxWorks systems, an absolute path can be represented (depending on
 223      the host platform) as either /dir/file, or device:/dir/file, or
 224      device:drive_letter:/dir/file. Use the __gnat_is_absolute_path
 225      to verify it. */
 226
 227   int length;
 228
 229   if (__gnat_is_absolute_path (nam, strlen (nam)))
 230     strcpy (buffer, nam);
 231
 232   else
 233     {
 234       length = __gnat_max_path_len;
 235       __gnat_get_current_dir (buffer, &length);
 236       strncat (buffer, nam, __gnat_max_path_len - length - 1);
 237     }
 238
 239 #else
 240   if (nam[0] != '/')
 241     {
 242       char *p = getcwd (buffer, __gnat_max_path_len);
 243
 244       if (p == 0)
 245         {
 246           buffer[0] = '\0';
 247           return 0;
 248         }
 249
 250
 251       /* If the name returned is an absolute path, it is safe to append '/'
 252          to the path and concatenate the name of the file. */
 253       if (buffer[0] == '/')
 254         strcat (buffer, "/");
 255
 256       strcat (buffer, nam);
 257     }
 258   else
 259     strcpy (buffer, nam);
 260 #endif
 261
 262   return buffer;
 263 }
 264
 265 #ifdef _WIN32
 266   /* On Windows we want to use the fseek/fteel supporting large files. This
 267      issue is due to the fact that a long on Win64 is still a 32 bits value */
 268 __int64
 269 __gnat_ftell64 (FILE *stream)
 270 {
 271   return _ftelli64 (stream);
 272 }
 273
 274 int
 275 __gnat_fseek64 (FILE *stream, __int64 offset, int origin)
 276 {
 277   return _fseeki64 (stream, offset, origin);
 278 }
 279
 280 #elif defined(linux) || defined(sun) \
 281   || defined (__FreeBSD__) || defined(__APPLE__)
 282 /* section for platforms having ftello/fseeko */
 283
 284 __int64
 285 __gnat_ftell64 (FILE *stream)
 286 {
 287   return (__int64)ftello (stream);
 288 }
 289
 290 int
 291 __gnat_fseek64 (FILE *stream, __int64 offset, int origin)
 292 {
 293   /* make sure that the offset is not bigger than the OS off_t, if so return
 294      with error as this mean that we are trying to handle files larger than
 295      2Gb on a patform not supporting it. */
 296   if ((off_t)offset == offset)
 297     return fseeko (stream, (off_t) offset, origin);
 298   else
 299     return -1;
 300 }
 301
 302 #else
 303
 304 __int64
 305 __gnat_ftell64 (FILE *stream)
 306 {
 307   return (__int64)ftell (stream);
 308 }
 309
 310 int
 311 __gnat_fseek64 (FILE *stream, __int64 offset, int origin)
 312 {
 313   /* make sure that the offset is not bigger than the OS off_t, if so return
 314      with error as this mean that we are trying to handle files larger than
 315      2Gb on a patform not supporting it. */
 316   if ((off_t)offset == offset)
 317     return fseek (stream, (off_t) offset, origin);
 318   else
 319     return -1;
 320 }
 321 #endif
 322
 323 #ifdef __cplusplus
 324 }
 325 #endif