1 /****************************************************************************
3 * GNAT RUN-TIME COMPONENTS *
7 * Auxiliary C functions for Interfaces.C.Streams *
9 * Copyright (C) 1992-2009, Free Software Foundation, Inc. *
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. *
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. *
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/>. *
27 * GNAT was originally developed by the GNAT team at New York University. *
28 * Extensive contributions were provided by Ada Core Technologies Inc. *
30 ****************************************************************************/
32 /* Routines required for implementing routines in Interfaces.C.Streams */
54 /* Don't use macros on GNU/Linux since they cause incompatible changes between
69 /* The _IONBF value in MINGW32 stdio.h is wrong. */
70 #if defined (WINNT) || defined (_WINNT)
78 __gnat_feof (FILE *stream)
80 return (feof (stream));
84 __gnat_ferror (FILE *stream)
86 return (ferror (stream));
90 __gnat_fileno (FILE *stream)
92 return (fileno (stream));
96 __gnat_is_regular_file_fd (int fd)
99 GNAT_STRUCT_STAT statbuf;
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 */
106 DosWrite (0, &ret, 0, &ret);
110 ret = GNAT_FSTAT (fd, &statbuf);
111 return (!ret && S_ISREG (statbuf.st_mode));
114 /* on some systems, the constants for seek are not defined, if so, then
115 provide the conventional definitions */
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 */
123 /* if L_tmpnam is not set, use a large number that should be safe */
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;
138 __gnat_constant_stderr (void)
144 __gnat_constant_stdin (void)
150 __gnat_constant_stdout (void)
156 __gnat_full_name (char *nam, char *buffer)
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)
164 if (nam[1] == ':' || nam[0] == '\\')
165 strcpy (buffer, nam);
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);
178 _fullpath (buffer, nam, __gnat_max_path_len);
180 for (p = buffer; *p; p++)
185 #elif defined (MSDOS)
186 _fixpath (nam, buffer);
188 #elif defined (sgi) || defined (__FreeBSD__)
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);
197 strncpy (buffer, __gnat_to_canonical_file_spec (nam), __gnat_max_path_len);
199 if (buffer[0] == '/' || strchr (buffer, '!')) /* '!' means decnet node */
200 strncpy (buffer, __gnat_to_host_file_spec (buffer), __gnat_max_path_len);
203 char *nambuffer = alloca (__gnat_max_path_len);
205 strncpy (nambuffer, buffer, __gnat_max_path_len);
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);
213 #elif defined (__vxworks)
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
222 if (__gnat_is_absolute_path (nam, strlen (nam)))
223 strcpy (buffer, nam);
227 length = __gnat_max_path_len;
228 __gnat_get_current_dir (buffer, &length);
229 strncat (buffer, nam, __gnat_max_path_len - length - 1);
235 char *p = getcwd (buffer, __gnat_max_path_len);
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, "/");
249 strcat (buffer, nam);
252 strcpy (buffer, nam);