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) 1992-2009, 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 VMS
  50 #include <unixlib.h>
  51 #endif
  52
  53 #ifdef linux
  54 /* Don't use macros on GNU/Linux since they cause incompatible changes between
  55    glibc 2.0 and 2.1 */
  56
  57 #ifdef stderr
  58 #  undef stderr
  59 #endif
  60 #ifdef stdin
  61 #  undef stdin
  62 #endif
  63 #ifdef stdout
  64 #  undef stdout
  65 #endif
  66
  67 #endif
  68
  69 /* The _IONBF value in MINGW32 stdio.h is wrong.  */
  70 #if defined (WINNT) || defined (_WINNT)
  71 #if OLD_MINGW
  72 #undef _IONBF
  73 #define _IONBF 0004
  74 #endif
  75 #endif
  76
  77 int
  78 __gnat_feof (FILE *stream)
  79 {
  80   return (feof (stream));
  81 }
  82
  83 int
  84 __gnat_ferror (FILE *stream)
  85 {
  86    return (ferror (stream));
  87 }
  88
  89 int
  90 __gnat_fileno (FILE *stream)
  91 {
  92    return (fileno (stream));
  93 }
  94
  95 int
  96 __gnat_is_regular_file_fd (int fd)
  97 {
  98   int ret;
  99   GNAT_STRUCT_STAT statbuf;
 100
 101 #ifdef __EMX__
 102   /* Programs using screen I/O may need to reset the FPU after
 103      initialization of screen-handling related DLL's, so force
 104      DLL initialization by doing a null-write and then reset the FPU */
 105
 106   DosWrite (0, &ret, 0, &ret);
 107   __gnat_init_float();
 108 #endif
 109
 110   ret = GNAT_FSTAT (fd, &statbuf);
 111   return (!ret && S_ISREG (statbuf.st_mode));
 112 }
 113
 114 /* on some systems, the constants for seek are not defined, if so, then
 115    provide the conventional definitions */
 116
 117 #ifndef SEEK_SET
 118 #define SEEK_SET 0  /* Set file pointer to offset                           */
 119 #define SEEK_CUR 1  /* Set file pointer to its current value plus offset    */
 120 #define SEEK_END 2  /* Set file pointer to the size of the file plus offset */
 121 #endif
 122
 123 /* if L_tmpnam is not set, use a large number that should be safe */
 124 #ifndef L_tmpnam
 125 #define L_tmpnam 256
 126 #endif
 127
 128 int    __gnat_constant_eof      = EOF;
 129 int    __gnat_constant_iofbf    = _IOFBF;
 130 int    __gnat_constant_iolbf    = _IOLBF;
 131 int    __gnat_constant_ionbf    = _IONBF;
 132 int    __gnat_constant_l_tmpnam = L_tmpnam;
 133 int    __gnat_constant_seek_cur = SEEK_CUR;
 134 int    __gnat_constant_seek_end = SEEK_END;
 135 int    __gnat_constant_seek_set = SEEK_SET;
 136
 137 FILE *
 138 __gnat_constant_stderr (void)
 139 {
 140   return stderr;
 141 }
 142
 143 FILE *
 144 __gnat_constant_stdin (void)
 145 {
 146   return stdin;
 147 }
 148
 149 FILE *
 150 __gnat_constant_stdout (void)
 151 {
 152   return stdout;
 153 }
 154
 155 char *
 156 __gnat_full_name (char *nam, char *buffer)
 157 {
 158 #ifdef RTSS
 159   /* RTSS applications have no current-directory notion, so RTSS file I/O
 160      requests must use fully qualified path names, such as:
 161        c:\temp\MyFile.txt (for a file system object)
 162        \\.\MyDevice0 (for a device object)
 163    */
 164   if (nam[1] == ':' || nam[0] == '\\')
 165     strcpy (buffer, nam);
 166   else
 167     buffer[0] = '\0';
 168
 169 #elif defined(__EMX__) || defined (__MINGW32__)
 170   /* If this is a device file return it as is; under Windows NT and
 171      OS/2 a device file end with ":".  */
 172   if (nam[strlen (nam) - 1] == ':')
 173     strcpy (buffer, nam);
 174   else
 175     {
 176       char *p;
 177
 178       _fullpath (buffer, nam, __gnat_max_path_len);
 179
 180       for (p = buffer; *p; p++)
 181         if (*p == '/')
 182           *p = '\\';
 183     }
 184
 185 #elif defined (MSDOS)
 186   _fixpath (nam, buffer);
 187
 188 #elif defined (sgi) || defined (__FreeBSD__)
 189
 190   /* Use realpath function which resolves links and references to . and ..
 191      on those Unix systems that support it. Note that GNU/Linux provides it but
 192      cannot handle more than 5 symbolic links in a full name, so we use the
 193      getcwd approach instead. */
 194   realpath (nam, buffer);
 195
 196 #elif defined (VMS)
 197   strncpy (buffer, __gnat_to_canonical_file_spec (nam), __gnat_max_path_len);
 198
 199   if (buffer[0] == '/' || strchr (buffer, '!'))  /* '!' means decnet node */
 200     strncpy (buffer, __gnat_to_host_file_spec (buffer), __gnat_max_path_len);
 201   else
 202     {
 203       char *nambuffer = alloca (__gnat_max_path_len);
 204
 205       strncpy (nambuffer, buffer, __gnat_max_path_len);
 206       strncpy
 207         (buffer, getcwd (buffer, __gnat_max_path_len, 0), __gnat_max_path_len);
 208       strncat (buffer, "/", __gnat_max_path_len);
 209       strncat (buffer, nambuffer, __gnat_max_path_len);
 210       strncpy (buffer, __gnat_to_host_file_spec (buffer), __gnat_max_path_len);
 211     }
 212
 213 #elif defined (__vxworks)
 214
 215   /* On VxWorks systems, an absolute path can be represented (depending on
 216      the host platform) as either /dir/file, or device:/dir/file, or
 217      device:drive_letter:/dir/file. Use the __gnat_is_absolute_path
 218      to verify it. */
 219
 220   int length;
 221
 222   if (__gnat_is_absolute_path (nam, strlen (nam)))
 223     strcpy (buffer, nam);
 224
 225   else
 226     {
 227       length = __gnat_max_path_len;
 228       __gnat_get_current_dir (buffer, &length);
 229       strncat (buffer, nam, __gnat_max_path_len - length - 1);
 230     }
 231
 232 #else
 233   if (nam[0] != '/')
 234     {
 235       char *p = getcwd (buffer, __gnat_max_path_len);
 236
 237       if (p == 0)
 238         {
 239           buffer[0] = '\0';
 240           return 0;
 241         }
 242
 243
 244       /* If the name returned is an absolute path, it is safe to append '/'
 245          to the path and concatenate the name of the file. */
 246       if (buffer[0] == '/')
 247         strcat (buffer, "/");
 248
 249       strcat (buffer, nam);
 250     }
 251   else
 252     strcpy (buffer, nam);
 253 #endif
 254
 255   return buffer;
 256 }