1 /****************************************************************************
3 * GNAT RUN-TIME COMPONENTS *
7 * Auxiliary C functions for Interfaces.C.Streams *
11 * Copyright (C) 1992-2001 Free Software Foundation, Inc. *
13 * GNAT is free software; you can redistribute it and/or modify it under *
14 * terms of the GNU General Public License as published by the Free Soft- *
15 * ware Foundation; either version 2, or (at your option) any later ver- *
16 * sion. GNAT is distributed in the hope that it will be useful, but WITH- *
17 * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
18 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
19 * for more details. You should have received a copy of the GNU General *
20 * Public License distributed with GNAT; see file COPYING. If not, write *
21 * to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, *
22 * MA 02111-1307, USA. *
24 * As a special exception, if you link this file with other files to *
25 * produce an executable, this file does not by itself cause the resulting *
26 * executable to be covered by the GNU General Public License. This except- *
27 * ion does not however invalidate any other reasons why the executable *
28 * file might be covered by the GNU Public License. *
30 * GNAT was originally developed by the GNAT team at New York University. *
31 * It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). *
33 ****************************************************************************/
35 /* Routines required for implementing routines in Interfaces.C.Streams */
53 int max_path_len = _MAX_PATH;
56 int max_path_len = 255; /* PATH_MAX */
58 #elif defined (__vxworks) || defined (__OPENNT)
60 int max_path_len = PATH_MAX;
66 /* Don't use macros on GNU/Linux since they cause incompatible changes between
81 #include <sys/param.h>
83 int max_path_len = MAXPATHLEN;
86 /* The _IONBF value in CYGNUS or MINGW32 stdio.h is wrong. */
87 #if defined (WINNT) || defined (_WINNT)
97 return (feof (stream));
101 __gnat_ferror (stream)
104 return (ferror (stream));
108 __gnat_fileno (stream)
111 return (fileno (stream));
115 __gnat_is_regular_file_fd (fd)
122 /* Programs using screen I/O may need to reset the FPU after
123 initialization of screen-handling related DLL's, so force
124 DLL initialization by doing a null-write and then reset the FPU */
126 DosWrite (0, &ret, 0, &ret);
130 ret = fstat (fd, &statbuf);
131 return (!ret && S_ISREG (statbuf.st_mode));
134 /* on some systems, the constants for seek are not defined, if so, then
135 provide the conventional definitions */
138 #define SEEK_SET 0 /* Set file pointer to offset */
139 #define SEEK_CUR 1 /* Set file pointer to its current value plus offset */
140 #define SEEK_END 2 /* Set file pointer to the size of the file plus offset */
143 /* if L_tmpnam is not set, use a large number that should be safe */
148 int __gnat_constant_eof = EOF;
149 int __gnat_constant_iofbf = _IOFBF;
150 int __gnat_constant_iolbf = _IOLBF;
151 int __gnat_constant_ionbf = _IONBF;
152 int __gnat_constant_l_tmpnam = L_tmpnam;
153 int __gnat_constant_seek_cur = SEEK_CUR;
154 int __gnat_constant_seek_end = SEEK_END;
155 int __gnat_constant_seek_set = SEEK_SET;
158 __gnat_constant_stderr ()
164 __gnat_constant_stdin ()
170 __gnat_constant_stdout ()
176 __gnat_full_name (nam, buffer)
182 #if defined(__EMX__) || defined (__MINGW32__)
183 /* If this is a device file return it as is; under Windows NT and
184 OS/2 a device file end with ":". */
185 if (nam [strlen (nam) - 1] == ':')
186 strcpy (buffer, nam);
189 _fullpath (buffer, nam, max_path_len);
191 for (p = buffer; *p; p++)
196 #elif defined (MSDOS)
197 _fixpath (nam, buffer);
201 /* Use realpath function which resolves links and references to .. and ..
202 on those Unix systems that support it. Note that GNU/Linux provides it but
203 cannot handle more than 5 symbolic links in a full name, so we use the
204 getcwd approach instead. */
205 realpath (nam, buffer);
208 strcpy (buffer, __gnat_to_canonical_file_spec (nam));
210 if (buffer[0] == '/')
211 strcpy (buffer, __gnat_to_host_file_spec (buffer));
214 char nambuffer [MAXPATHLEN];
216 strcpy (nambuffer, buffer);
217 strcpy (buffer, getcwd (buffer, max_path_len, 0));
218 strcat (buffer, "/");
219 strcat (buffer, nambuffer);
220 strcpy (buffer, __gnat_to_host_file_spec (buffer));
228 p = getcwd (buffer, max_path_len);
235 /* If the name returned is an absolute path, it is safe to append '/'
236 to the path and concatenate the name of the file. */
237 if (buffer[0] == '/')
238 strcat (buffer, "/");
240 strcat (buffer, nam);
243 strcpy (buffer, nam);