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) 1992-2015, 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 #include <sys/stat.h>
  43 #include <unistd.h>
  44
  45 #ifdef _AIX
  46 /* needed to avoid conflicting declarations */
  47 #include <unistd.h>
  48 #include <sys/mman.h>
  49 #endif
  50
  51 #ifdef __vxworks
  52 #include "vxWorks.h"
  53 #endif
  54
  55 #ifdef IN_RTS
  56 #include "tconfig.h"
  57 #include "tsystem.h"
  58 #include <sys/stat.h>
  59 #else
  60 #include "config.h"
  61 #include "system.h"
  62 #endif
  63
  64 #include "adaint.h"
  65
  66 #ifdef __cplusplus
  67 extern "C" {
  68 #endif
  69
  70 #ifdef VMS
  71 #include <unixlib.h>
  72 #endif
  73
  74 #ifdef __linux__
  75 /* Don't use macros on GNU/Linux since they cause incompatible changes between
  76    glibc 2.0 and 2.1 */
  77
  78 #ifdef stderr
  79 #  undef stderr
  80 #endif
  81 #ifdef stdin
  82 #  undef stdin
  83 #endif
  84 #ifdef stdout
  85 #  undef stdout
  86 #endif
  87
  88 #endif
  89
  90 /* Don't use macros versions of this functions on VxWorks since they cause
  91    imcompatible changes in some VxWorks versions */
  92 #ifdef __vxworks
  93 #undef getchar
  94 #undef putchar
  95 #undef feof
  96 #undef ferror
  97 #undef fileno
  98 #endif
  99
 100 /* The _IONBF value in MINGW32 stdio.h is wrong.  */
 101 #if defined (WINNT) || defined (_WINNT)
 102 #if OLD_MINGW
 103 #undef _IONBF
 104 #define _IONBF 0004
 105 #endif
 106 #endif
 107
 108 int
 109 __gnat_feof (FILE *stream)
 110 {
 111   return (feof (stream));
 112 }
 113
 114 int
 115 __gnat_ferror (FILE *stream)
 116 {
 117    return (ferror (stream));
 118 }
 119
 120 int
 121 __gnat_fileno (FILE *stream)
 122 {
 123    return (fileno (stream));
 124 }
 125
 126 /* on some systems, the constants for seek are not defined, if so, then
 127    provide the conventional definitions */
 128
 129 #ifndef SEEK_SET
 130 #define SEEK_SET 0  /* Set file pointer to offset                           */
 131 #define SEEK_CUR 1  /* Set file pointer to its current value plus offset    */
 132 #define SEEK_END 2  /* Set file pointer to the size of the file plus offset */
 133 #endif
 134
 135 /* if L_tmpnam is not set, use a large number that should be safe */
 136 #ifndef L_tmpnam
 137 #define L_tmpnam 256
 138 #endif
 139
 140 int    __gnat_constant_eof      = EOF;
 141 int    __gnat_constant_iofbf    = _IOFBF;
 142 int    __gnat_constant_iolbf    = _IOLBF;
 143 int    __gnat_constant_ionbf    = _IONBF;
 144 int    __gnat_constant_l_tmpnam = L_tmpnam;
 145 int    __gnat_constant_seek_cur = SEEK_CUR;
 146 int    __gnat_constant_seek_end = SEEK_END;
 147 int    __gnat_constant_seek_set = SEEK_SET;
 148
 149 FILE *
 150 __gnat_constant_stderr (void)
 151 {
 152   return stderr;
 153 }
 154
 155 FILE *
 156 __gnat_constant_stdin (void)
 157 {
 158   return stdin;
 159 }
 160
 161 FILE *
 162 __gnat_constant_stdout (void)
 163 {
 164   return stdout;
 165 }
 166
 167 char *
 168 __gnat_full_name (char *nam, char *buffer)
 169 {
 170 #ifdef RTSS
 171   /* RTSS applications have no current-directory notion, so RTSS file I/O
 172      requests must use fully qualified path names, such as:
 173        c:\temp\MyFile.txt (for a file system object)
 174        \\.\MyDevice0 (for a device object)
 175    */
 176   if (nam[1] == ':' || nam[0] == '\\')
 177     strcpy (buffer, nam);
 178   else
 179     buffer[0] = '\0';
 180
 181 #elif defined (__MINGW32__)
 182   /* If this is a device file return it as is;
 183      under Windows NT a device file ends with ":".  */
 184   if (nam[strlen (nam) - 1] == ':')
 185     strcpy (buffer, nam);
 186   else
 187     {
 188       char *p;
 189
 190       _fullpath (buffer, nam, __gnat_max_path_len);
 191
 192       for (p = buffer; *p; p++)
 193         if (*p == '/')
 194           *p = '\\';
 195     }
 196
 197 #elif defined (__FreeBSD__) || defined (__DragonFly__) || defined (__OpenBSD__)
 198
 199   /* Use realpath function which resolves links and references to . and ..
 200      on those Unix systems that support it. Note that GNU/Linux provides it but
 201      cannot handle more than 5 symbolic links in a full name, so we use the
 202      getcwd approach instead. */
 203   realpath (nam, buffer);
 204
 205 #elif defined (VMS)
 206   strncpy (buffer, __gnat_to_canonical_file_spec (nam), __gnat_max_path_len);
 207
 208   if (buffer[0] == '/' || strchr (buffer, '!'))  /* '!' means decnet node */
 209     strncpy (buffer, __gnat_to_host_file_spec (buffer), __gnat_max_path_len);
 210   else
 211     {
 212       char *nambuffer = alloca (__gnat_max_path_len);
 213
 214       strncpy (nambuffer, buffer, __gnat_max_path_len);
 215       strncpy
 216         (buffer, getcwd (buffer, __gnat_max_path_len, 0), __gnat_max_path_len);
 217       strncat (buffer, "/", __gnat_max_path_len);
 218       strncat (buffer, nambuffer, __gnat_max_path_len);
 219       strncpy (buffer, __gnat_to_host_file_spec (buffer), __gnat_max_path_len);
 220     }
 221
 222 #elif defined (__vxworks)
 223
 224   /* On VxWorks systems, an absolute path can be represented (depending on
 225      the host platform) as either /dir/file, or device:/dir/file, or
 226      device:drive_letter:/dir/file. Use the __gnat_is_absolute_path
 227      to verify it. */
 228
 229   int length;
 230
 231   if (__gnat_is_absolute_path (nam, strlen (nam)))
 232     strcpy (buffer, nam);
 233
 234   else
 235     {
 236       length = __gnat_max_path_len;
 237       __gnat_get_current_dir (buffer, &length);
 238       strncat (buffer, nam, __gnat_max_path_len - length - 1);
 239     }
 240
 241 #else
 242   if (nam[0] != '/')
 243     {
 244       char *p = getcwd (buffer, __gnat_max_path_len);
 245
 246       if (p == 0)
 247         {
 248           buffer[0] = '\0';
 249           return 0;
 250         }
 251
 252
 253       /* If the name returned is an absolute path, it is safe to append '/'
 254          to the path and concatenate the name of the file. */
 255       if (buffer[0] == '/')
 256         strcat (buffer, "/");
 257
 258       strcat (buffer, nam);
 259     }
 260   else
 261     strcpy (buffer, nam);
 262 #endif
 263
 264   return buffer;
 265 }
 266
 267 #ifdef _WIN32
 268   /* On Windows we want to use the fseek/fteel supporting large files. This
 269      issue is due to the fact that a long on Win64 is still a 32 bits value */
 270 __int64
 271 __gnat_ftell64 (FILE *stream)
 272 {
 273   return _ftelli64 (stream);
 274 }
 275
 276 int
 277 __gnat_fseek64 (FILE *stream, __int64 offset, int origin)
 278 {
 279   return _fseeki64 (stream, offset, origin);
 280 }
 281
 282 #elif defined (__linux__) || defined (__sun__) || defined (__FreeBSD__) \
 283   || defined (__APPLE__)
 284 /* section for platforms having ftello/fseeko */
 285
 286 __int64
 287 __gnat_ftell64 (FILE *stream)
 288 {
 289   return (__int64)ftello (stream);
 290 }
 291
 292 int
 293 __gnat_fseek64 (FILE *stream, __int64 offset, int origin)
 294 {
 295   /* make sure that the offset is not bigger than the OS off_t, if so return
 296      with error as this mean that we are trying to handle files larger than
 297      2Gb on a patform not supporting it. */
 298   if ((off_t)offset == offset)
 299     return fseeko (stream, (off_t) offset, origin);
 300   else
 301     return -1;
 302 }
 303
 304 #else
 305
 306 __int64
 307 __gnat_ftell64 (FILE *stream)
 308 {
 309   return (__int64)ftell (stream);
 310 }
 311
 312 int
 313 __gnat_fseek64 (FILE *stream, __int64 offset, int origin)
 314 {
 315   /* make sure that the offset is not bigger than the OS off_t, if so return
 316      with error as this mean that we are trying to handle files larger than
 317      2Gb on a patform not supporting it. */
 318   if ((off_t)offset == offset)
 319     return fseek (stream, (off_t) offset, origin);
 320   else
 321     return -1;
 322 }
 323 #endif
 324
 325 /* Returns true if the path names a fifo (i.e. a named pipe). */
 326 int
 327 __gnat_is_fifo (const char* path)
 328 {
 329 /* Posix defines S_ISFIFO as a macro. If the macro doesn't exist, we return
 330    false. */
 331 #ifdef S_ISFIFO
 332   struct stat buf;
 333   const int status = stat(path, &buf);
 334   if (status == 0)
 335     return S_ISFIFO(buf.st_mode);
 336 #endif
 337
 338   /* S_ISFIFO is not available, or stat got an error (probably
 339      file not found). */
 340   return 0;
 341 }
 342
 343 #ifdef __cplusplus
 344 }
 345 #endif