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) 1992-2007, 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 2,  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.  See the GNU General Public License *
  17  * for  more details.  You should have  received  a copy of the GNU General *
  18  * Public License  distributed with GNAT;  see file COPYING.  If not, write *
  19  * to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, *
  20  * Boston, MA 02110-1301, USA.                                              *
  21  *                                                                          *
  22  * As a  special  exception,  if you  link  this file  with other  files to *
  23  * produce an executable,  this file does not by itself cause the resulting *
  24  * executable to be covered by the GNU General Public License. This except- *
  25  * ion does not  however invalidate  any other reasons  why the  executable *
  26  * file might be covered by the  GNU Public License.                        *
  27  *                                                                          *
  28  * GNAT was originally developed  by the GNAT team at  New York University. *
  29  * Extensive contributions were provided by Ada Core Technologies Inc.      *
  30  *                                                                          *
  31  ****************************************************************************/
  32
  33 /* Routines required for implementing routines in Interfaces.C.Streams */
  34
  35 #ifdef __vxworks
  36 #include "vxWorks.h"
  37 #endif
  38
  39 #ifdef IN_RTS
  40 #include "tconfig.h"
  41 #include "tsystem.h"
  42 #include <sys/stat.h>
  43 #else
  44 #include "config.h"
  45 #include "system.h"
  46 #endif
  47
  48 #include "adaint.h"
  49
  50 #ifdef VMS
  51 #include <unixlib.h>
  52 #endif
  53
  54 #ifdef linux
  55 /* Don't use macros on GNU/Linux since they cause incompatible changes between
  56    glibc 2.0 and 2.1 */
  57
  58 #ifdef stderr
  59 #  undef stderr
  60 #endif
  61 #ifdef stdin
  62 #  undef stdin
  63 #endif
  64 #ifdef stdout
  65 #  undef stdout
  66 #endif
  67
  68 #endif
  69
  70 /* The _IONBF value in MINGW32 stdio.h is wrong.  */
  71 #if defined (WINNT) || defined (_WINNT)
  72 #if OLD_MINGW
  73 #undef _IONBF
  74 #define _IONBF 0004
  75 #endif
  76 #endif
  77
  78 int
  79 __gnat_feof (FILE *stream)
  80 {
  81   return (feof (stream));
  82 }
  83
  84 int
  85 __gnat_ferror (FILE *stream)
  86 {
  87    return (ferror (stream));
  88 }
  89
  90 int
  91 __gnat_fileno (FILE *stream)
  92 {
  93    return (fileno (stream));
  94 }
  95
  96 int
  97 __gnat_is_regular_file_fd (int fd)
  98 {
  99   int ret;
 100   struct stat statbuf;
 101
 102 #ifdef __EMX__
 103   /* Programs using screen I/O may need to reset the FPU after
 104      initialization of screen-handling related DLL's, so force
 105      DLL initialization by doing a null-write and then reset the FPU */
 106
 107   DosWrite (0, &ret, 0, &ret);
 108   __gnat_init_float();
 109 #endif
 110
 111   ret = fstat (fd, &statbuf);
 112   return (!ret && S_ISREG (statbuf.st_mode));
 113 }
 114
 115 /* on some systems, the constants for seek are not defined, if so, then
 116    provide the conventional definitions */
 117
 118 #ifndef SEEK_SET
 119 #define SEEK_SET 0  /* Set file pointer to offset                           */
 120 #define SEEK_CUR 1  /* Set file pointer to its current value plus offset    */
 121 #define SEEK_END 2  /* Set file pointer to the size of the file plus offset */
 122 #endif
 123
 124 /* if L_tmpnam is not set, use a large number that should be safe */
 125 #ifndef L_tmpnam
 126 #define L_tmpnam 256
 127 #endif
 128
 129 int    __gnat_constant_eof      = EOF;
 130 int    __gnat_constant_iofbf    = _IOFBF;
 131 int    __gnat_constant_iolbf    = _IOLBF;
 132 int    __gnat_constant_ionbf    = _IONBF;
 133 int    __gnat_constant_l_tmpnam = L_tmpnam;
 134 int    __gnat_constant_seek_cur = SEEK_CUR;
 135 int    __gnat_constant_seek_end = SEEK_END;
 136 int    __gnat_constant_seek_set = SEEK_SET;
 137
 138 FILE *
 139 __gnat_constant_stderr (void)
 140 {
 141   return stderr;
 142 }
 143
 144 FILE *
 145 __gnat_constant_stdin (void)
 146 {
 147   return stdin;
 148 }
 149
 150 FILE *
 151 __gnat_constant_stdout (void)
 152 {
 153   return stdout;
 154 }
 155
 156 char *
 157 __gnat_full_name (char *nam, char *buffer)
 158 {
 159 #if defined(__EMX__) || defined (__MINGW32__)
 160   /* If this is a device file return it as is; under Windows NT and
 161      OS/2 a device file end with ":".  */
 162   if (nam[strlen (nam) - 1] == ':')
 163     strcpy (buffer, nam);
 164   else
 165     {
 166       char *p;
 167
 168       _fullpath (buffer, nam, __gnat_max_path_len);
 169
 170       for (p = buffer; *p; p++)
 171         if (*p == '/')
 172           *p = '\\';
 173     }
 174
 175 #elif defined (MSDOS)
 176   _fixpath (nam, buffer);
 177
 178 #elif defined (sgi) || defined (__FreeBSD__)
 179
 180   /* Use realpath function which resolves links and references to . and ..
 181      on those Unix systems that support it. Note that GNU/Linux provides it but
 182      cannot handle more than 5 symbolic links in a full name, so we use the
 183      getcwd approach instead. */
 184   realpath (nam, buffer);
 185
 186 #elif defined (VMS)
 187   strncpy (buffer, __gnat_to_canonical_file_spec (nam), __gnat_max_path_len);
 188
 189   if (buffer[0] == '/' || strchr (buffer, '!'))  /* '!' means decnet node */
 190     strncpy (buffer, __gnat_to_host_file_spec (buffer), __gnat_max_path_len);
 191   else
 192     {
 193       char *nambuffer = alloca (__gnat_max_path_len);
 194
 195       strncpy (nambuffer, buffer, __gnat_max_path_len);
 196       strncpy
 197         (buffer, getcwd (buffer, __gnat_max_path_len, 0), __gnat_max_path_len);
 198       strncat (buffer, "/", __gnat_max_path_len);
 199       strncat (buffer, nambuffer, __gnat_max_path_len);
 200       strncpy (buffer, __gnat_to_host_file_spec (buffer), __gnat_max_path_len);
 201     }
 202
 203 #elif defined (__vxworks)
 204
 205   /* On VxWorks systems, an absolute path can be represented (depending on
 206      the host platform) as either /dir/file, or device:/dir/file, or
 207      device:drive_letter:/dir/file. Use the __gnat_is_absolute_path
 208      to verify it. */
 209
 210   int length;
 211
 212   if (__gnat_is_absolute_path (nam, strlen (nam)))
 213     strcpy (buffer, nam);
 214
 215   else
 216     {
 217       length = __gnat_max_path_len;
 218       __gnat_get_current_dir (buffer, &length);
 219       strncat (buffer, nam, __gnat_max_path_len - length - 1);
 220     }
 221
 222 #else
 223   if (nam[0] != '/')
 224     {
 225       char *p = getcwd (buffer, __gnat_max_path_len);
 226
 227       if (p == 0)
 228         {
 229           buffer[0] = '\0';
 230           return 0;
 231         }
 232
 233
 234       /* If the name returned is an absolute path, it is safe to append '/'
 235          to the path and concatenate the name of the file. */
 236       if (buffer[0] == '/')
 237         strcat (buffer, "/");
 238
 239       strcat (buffer, nam);
 240     }
 241   else
 242     strcpy (buffer, nam);
 243 #endif
 244
 245   return buffer;
 246 }