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) 1992-2012, 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 #ifdef __vxworks
  35 #include "vxWorks.h"
  36 #endif
  37
  38 #ifdef IN_RTS
  39 #include "tconfig.h"
  40 #include "tsystem.h"
  41 #include <sys/stat.h>
  42 #else
  43 #include "config.h"
  44 #include "system.h"
  45 #endif
  46
  47 #include "adaint.h"
  48
  49 #ifdef __cplusplus
  50 extern "C" {
  51 #endif
  52
  53 #ifdef VMS
  54 #include <unixlib.h>
  55 #endif
  56
  57 #ifdef linux
  58 /* Don't use macros on GNU/Linux since they cause incompatible changes between
  59    glibc 2.0 and 2.1 */
  60
  61 #ifdef stderr
  62 #  undef stderr
  63 #endif
  64 #ifdef stdin
  65 #  undef stdin
  66 #endif
  67 #ifdef stdout
  68 #  undef stdout
  69 #endif
  70
  71 #endif
  72
  73 /* Don't use macros versions of this functions on VxWorks since they cause
  74    imcompatible changes in some VxWorks versions */
  75 #ifdef __vxworks
  76 #undef getchar
  77 #undef putchar
  78 #undef feof
  79 #undef ferror
  80 #undef fileno
  81 #endif
  82
  83 /* The _IONBF value in MINGW32 stdio.h is wrong.  */
  84 #if defined (WINNT) || defined (_WINNT)
  85 #if OLD_MINGW
  86 #undef _IONBF
  87 #define _IONBF 0004
  88 #endif
  89 #endif
  90
  91 int
  92 __gnat_feof (FILE *stream)
  93 {
  94   return (feof (stream));
  95 }
  96
  97 int
  98 __gnat_ferror (FILE *stream)
  99 {
 100    return (ferror (stream));
 101 }
 102
 103 int
 104 __gnat_fileno (FILE *stream)
 105 {
 106    return (fileno (stream));
 107 }
 108
 109 int
 110 __gnat_is_regular_file_fd (int fd)
 111 {
 112   int ret;
 113   GNAT_STRUCT_STAT statbuf;
 114
 115   ret = GNAT_FSTAT (fd, &statbuf);
 116   return (!ret && S_ISREG (statbuf.st_mode));
 117 }
 118
 119 /* on some systems, the constants for seek are not defined, if so, then
 120    provide the conventional definitions */
 121
 122 #ifndef SEEK_SET
 123 #define SEEK_SET 0  /* Set file pointer to offset                           */
 124 #define SEEK_CUR 1  /* Set file pointer to its current value plus offset    */
 125 #define SEEK_END 2  /* Set file pointer to the size of the file plus offset */
 126 #endif
 127
 128 /* if L_tmpnam is not set, use a large number that should be safe */
 129 #ifndef L_tmpnam
 130 #define L_tmpnam 256
 131 #endif
 132
 133 int    __gnat_constant_eof      = EOF;
 134 int    __gnat_constant_iofbf    = _IOFBF;
 135 int    __gnat_constant_iolbf    = _IOLBF;
 136 int    __gnat_constant_ionbf    = _IONBF;
 137 int    __gnat_constant_l_tmpnam = L_tmpnam;
 138 int    __gnat_constant_seek_cur = SEEK_CUR;
 139 int    __gnat_constant_seek_end = SEEK_END;
 140 int    __gnat_constant_seek_set = SEEK_SET;
 141
 142 FILE *
 143 __gnat_constant_stderr (void)
 144 {
 145   return stderr;
 146 }
 147
 148 FILE *
 149 __gnat_constant_stdin (void)
 150 {
 151   return stdin;
 152 }
 153
 154 FILE *
 155 __gnat_constant_stdout (void)
 156 {
 157   return stdout;
 158 }
 159
 160 char *
 161 __gnat_full_name (char *nam, char *buffer)
 162 {
 163 #ifdef RTSS
 164   /* RTSS applications have no current-directory notion, so RTSS file I/O
 165      requests must use fully qualified path names, such as:
 166        c:\temp\MyFile.txt (for a file system object)
 167        \\.\MyDevice0 (for a device object)
 168    */
 169   if (nam[1] == ':' || nam[0] == '\\')
 170     strcpy (buffer, nam);
 171   else
 172     buffer[0] = '\0';
 173
 174 #elif defined (__MINGW32__)
 175   /* If this is a device file return it as is;
 176      under Windows NT a device file ends with ":".  */
 177   if (nam[strlen (nam) - 1] == ':')
 178     strcpy (buffer, nam);
 179   else
 180     {
 181       char *p;
 182
 183       _fullpath (buffer, nam, __gnat_max_path_len);
 184
 185       for (p = buffer; *p; p++)
 186         if (*p == '/')
 187           *p = '\\';
 188     }
 189
 190 #elif defined (__FreeBSD__)
 191
 192   /* Use realpath function which resolves links and references to . and ..
 193      on those Unix systems that support it. Note that GNU/Linux provides it but
 194      cannot handle more than 5 symbolic links in a full name, so we use the
 195      getcwd approach instead. */
 196   realpath (nam, buffer);
 197
 198 #elif defined (VMS)
 199   strncpy (buffer, __gnat_to_canonical_file_spec (nam), __gnat_max_path_len);
 200
 201   if (buffer[0] == '/' || strchr (buffer, '!'))  /* '!' means decnet node */
 202     strncpy (buffer, __gnat_to_host_file_spec (buffer), __gnat_max_path_len);
 203   else
 204     {
 205       char *nambuffer = alloca (__gnat_max_path_len);
 206
 207       strncpy (nambuffer, buffer, __gnat_max_path_len);
 208       strncpy
 209         (buffer, getcwd (buffer, __gnat_max_path_len, 0), __gnat_max_path_len);
 210       strncat (buffer, "/", __gnat_max_path_len);
 211       strncat (buffer, nambuffer, __gnat_max_path_len);
 212       strncpy (buffer, __gnat_to_host_file_spec (buffer), __gnat_max_path_len);
 213     }
 214
 215 #elif defined (__vxworks)
 216
 217   /* On VxWorks systems, an absolute path can be represented (depending on
 218      the host platform) as either /dir/file, or device:/dir/file, or
 219      device:drive_letter:/dir/file. Use the __gnat_is_absolute_path
 220      to verify it. */
 221
 222   int length;
 223
 224   if (__gnat_is_absolute_path (nam, strlen (nam)))
 225     strcpy (buffer, nam);
 226
 227   else
 228     {
 229       length = __gnat_max_path_len;
 230       __gnat_get_current_dir (buffer, &length);
 231       strncat (buffer, nam, __gnat_max_path_len - length - 1);
 232     }
 233
 234 #else
 235   if (nam[0] != '/')
 236     {
 237       char *p = getcwd (buffer, __gnat_max_path_len);
 238
 239       if (p == 0)
 240         {
 241           buffer[0] = '\0';
 242           return 0;
 243         }
 244
 245
 246       /* If the name returned is an absolute path, it is safe to append '/'
 247          to the path and concatenate the name of the file. */
 248       if (buffer[0] == '/')
 249         strcat (buffer, "/");
 250
 251       strcat (buffer, nam);
 252     }
 253   else
 254     strcpy (buffer, nam);
 255 #endif
 256
 257   return buffer;
 258 }
 259
 260 #ifdef _WIN64
 261   /* On Windows 64 we want to use the fseek/fteel supporting large files. This
 262      issue is due to the fact that a long on Win64 is still a 32 bits value */
 263 __int64
 264 __gnat_ftell64 (FILE *stream)
 265 {
 266   return _ftelli64 (stream);
 267 }
 268
 269 int
 270 __gnat_fseek64 (FILE *stream, __int64 offset, int origin)
 271 {
 272   return _fseeki64 (stream, offset, origin);
 273 }
 274
 275 #else
 276 long
 277 __gnat_ftell64 (FILE *stream)
 278 {
 279   return ftell (stream);
 280 }
 281
 282 int
 283 __gnat_fseek64 (FILE *stream, long offset, int origin)
 284 {
 285   return fseek (stream, offset, origin);
 286 }
 287 #endif
 288
 289 #ifdef __cplusplus
 290 }
 291 #endif